1.WCDMA RNO Access Procedure Analysis Guidance-20041101-A-2.0
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Transcript of 1.WCDMA RNO Access Procedure Analysis Guidance-20041101-A-2.0
Huawei Technologies Co. Ltd.
Product Version Confidentiality
V100R001 For internal use only
Product Name: WCDMA RNP Total pages: 81
WCDMA RNO Access Procedure
Analysis Guidance
For internal use only
Prepared by URNP-SANA Date 2003-05-24
Reviewed by Date
Reviewed by Date
Approved by Date
Huawei Technologies Co., Ltd.
All rights reserved
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Revision Record
Date Revision Version
Description Author
2003-05-24 1.00 Initial issued Chen Qi
2003-06-03 1.00 Revision based on the review comments Chen Qi
2004-11-01 2.00 Change the version, no content updated. Qinyan
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Table of Contents
1 Access Procedure .................................................................................................................................. 7
1.1 Cell Search ....................................................................................................................................... 7
1.1.1 Step 1: Slot Synchronization ................................................................................................ 7
1.1.2 Step 2: Frame Synchronization and Scrambling Code Group Identification ........................... 7
1.1.3 Step 3: Cell Primary Scrambling Code Identification ............................................................ 8
1.2 Cell Selection and Cell Reselection .................................................................................................. 8
1.2.1 Cell Selection ...................................................................................................................... 8
1.2.1.1 Triggering occasions: .............................................................................................. 8
1.2.1.2 PLMN selection ....................................................................................................... 9
1.2.1.3 Determing Criteria (S criteria) ................................................................................. 9
1.2.2 Cell Reselection ................................................................................................................. 11
1.2.2.1 Triggering occasions ............................................................................................. 11
1.2.2.2 Measurement rules ............................................................................................... 11
1.2.2.3 Judging criteria (H criteria and R criteria) ............................................................ 13
1.3 Random Access .............................................................................................................................. 16
1.3.1 Random Access Channel .................................................................................................... 17
1.3.2 Random Access Procedure ................................................................................................. 19
2 Signalling Messages of Access Procedure ........................................................................................... 22
2.1 System Information Broadcast ........................................................................................................ 22
2.1.1 System Information Structure ............................................................................................. 22
2.1.2 System Information Broadcast Procedure ........................................................................... 24
2.1.3 System Information Update ................................................................................................ 26
2.1.4 Description of IEs of SIBs .................................................................................................. 28
2.1.4.1 MIB: ........................................................................................................................ 28
2.1.4.2 SIB1: ....................................................................................................................... 28
2.1.4.3 SIB2: ....................................................................................................................... 30
2.1.4.4 SIB3: ....................................................................................................................... 30
2.1.4.5 SIB5: ....................................................................................................................... 32
2.1.4.6 SIB7: ....................................................................................................................... 33
2.1.4.7 SIB11: ..................................................................................................................... 33
2.1.4.8 SIB18: ..................................................................................................................... 33
2.2 RRC Connection ............................................................................................................................ 33
2.2.1 RRC_CONNECTION_REQUEST ..................................................................................... 34
2.2.2 RRC_CONNECTION_SETUP & RRC_CONNECTION_SETUP_COMPLETE................ 35
2.2.2.1 UE in the CELL_FACH state after the RRC connection setup .......................... 36
2.2.2.2 UE in CELL_DCH state after RRC connection setup ......................................... 39
3 Access Procedure Performance Analysis ............................................................................................. 43
3.1 Performance Indices of Access Procedure ....................................................................................... 43
3.2 Relevant Factors Affecting Access Procedure Performance ............................................................ 44
3.2.1 Incorrect Setting of Tcell Affecting Cell Searching Speed .................................................... 44
3.2.2 Unreasonable Neighboring cell List Affecting Cell Selection .............................................. 44
3.2.3 Doppler Frequency Shift Affecting Access Performance of UE .......................................... 44
3.2.4 Traffic Distribution in Cell Effect on Acquisition Probability ............................................. 45
3.2.5 Different Clutters Affecting Open Loop Power Control ...................................................... 45
4 Analysis Procedure for Access Procedure ............................................................................................ 46
4.1 Step 1: Knowing System Performance ............................................................................................ 46
4.2 Step 2: Ensuring a Stable System .................................................................................................... 46
4.3 Step 3: Determining Neighboring cell Distribution ......................................................................... 46
4.4 Step 4: Executing Pilot Auditing ..................................................................................................... 47
4.5 Step 5: Updating Neighboring cell List ........................................................................................... 47
4.6 Step 6: Drive Test .......................................................................................................................... 47
4.7 Step 7: Drive test Result Analysis ................................................................................................... 47
4.7.1 Analysis Method ................................................................................................................ 47
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4.7.2 Parameters to be Analyzed and Adjusted in the Access Procedure ...................................... 48
5 Analysis of Problems in Access Procedure .......................................................................................... 48
5.1 UE Failing in Cell Search ............................................................................................................... 48
5.2 UE Failing in Cell Access or Receiving RRC Connection Rejection ............................................... 48
5.3 RNC Failing in Receiving the RRC_CONNECTION_REQ Message Transmitted by UE ................ 48
5.4 UE Failing in Receiving the RRC_CONNECTION_SETUP Message Transmitted by RNC ............ 49
5.5 UE Failing in Receiving ACK Message Indicating RRC Connection Completion ........................... 49
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List of Tables
Table 1 S criteria parameter description ................................................................................................. 9
Table 2 Cell reselection parameter description ...................................................................................... 15
Table 3 Description of the parameters of cell reselection in system information broadcasts .......................... 15
Table 4 Relation between access subchannel and access slot and SFN ................................................... 21
Table 5 System information block ....................................................................................................... 23
Table 6 Parameters to be analyzed and adjusted in the access procedure ................................................ 49
List of Pictures
Figure 1 Number of RACH access slots and interval between them .......................................................... 17
Figure 2 Structure of random access transmission ................................................................................. 18
Figure 3 PRACH-AICH timing relation from the view of UE ...................................................................... 19
Figure 4 Definition of access slot set (with the example of uplink/downlink access slot fixed difference p-a
7680chips) 22
Figure 5 System information structure .................................................................................................. 23
Figure 6 RRC signalling connection setup process ................................................................................. 33
Figure 7 RRC CONNECT REQUEST ................................................................................................... 35
Figure 8 RRC CONNECT SETUP (DCCH is mapped on common channel) ............................................... 36
Figure 9 MappingInfo of SRB1 and SRB2 of the DCCH mapped to the common channel ............................. 38
Figure 10 RRC CONNECT SETUP COMPLETE (DCCH is mapped on the common channel ......................... 39
Figure 11 RRC CONNECT SETUP (DCCH is mapped to the dedicated channel ........................................... 40
Figure 12 MapingInfo of SRB1 and SRB2 of the DCCH mapped to the DCH ................................................ 42
Figure 13 RRC CONNECT SETUP COMPLETE (DCCH is mapped to the DCH) .......................................... 42
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WCDMA RNO Access Procedure Analysis Guidance
Key words: Access procedure, cell search, cell selection and reselection, random access
Abstract: This document analyzes in detail the whole access procedure from the view of access
stratum (AS), discusses access performance indices and influence factors, and
presents the analysis process of access procedure in the actual network planning and
the solutions to the possible problems in the access.
Acronym list: Omitted.
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1 Access Procedure
UE can run in one of these two basic modes: idle mode and connected mode. After the UE
is powered on, it keeps in idle mode and is differentiated through non AS identities, such as IMSI,
TMSI or P-TMSI. The UTRAN does not store the information of the UE in idle mode, but it can
page all UEs which are powered on and camp on the cell one by one, or page all the UEs in idle
mode in an RNC at the same time. Only after the UE finishes the RRC connection setup will it
enter to connected mode (CELL_FACH or CELL_DCH state) from idle mode. When the RRC
connection is released, it will enter idle mode from connected mode.
Viewing from the AS, access procedure is the procedure of a transition from idle mode to
connected mode of the UE. It includes four basic procedures: cell search, cell system information
broadcast receiving, cell selection and reselection, and random access. Once the UE enters
connected mode, it can carry out such non AS activities as PLMN selection and reselection,
location registration, service application and authentication. This document summarizes all the
steps in the UE access procedure, analyzes the signalling and performance of the whole access
procedure, and discusses the analysis methods for the access procedure and the solutions to
the problems in the drive test based on the analysis.
1.1 Cell Search
UE will search cell according to one of the following procedure:
UE is independent of the information of the RF channel of UTRA carrier frequency. In this
case, UE will scan all frequencies in all UTRA bands to locate a suitable cell to camp on in the
selected PLMN. In each carrier frequency, UE only needs to search the best serving cell.
UE has the stored UTRA carrier frequency information and cell parameter information which
obtained from measurement control information received before, such as primary scrambling
code of cell. In this case, UE will attempt to camp on this cell directly. If it fails, it can only scan all
frequencies in all UTRA bands to locate a suitable cell in the selected PLMN.
The procedure of carrying out cell search is as follows (Of course, a frequency locked first):
1.1.1 Step 1: Slot Synchronization
All primary SCH synchronization codes in the UTRAN are identical and are transmitted in
the former 256 chips of each slot. The synchronization codes of each slot are the same. The UE
can achieve slot synchronization easily by using a matched filter or the similar technology.
1.1.2 Step 2: Frame Synchronization and Scrambling Code Group Identification
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Frame synchronization is realized by means of secondary SCH synchronization. There are
16 secondary SCH synchronization codes in all, which are different in each slot. They form 64
groups of code sequences according to different code words in each slot. The 64 groups of code
sequences feature that the result after any cyclic shift is unique. The UE can perform SSC
correlation calculation, FWHT and RS decoding to determine the cell scrambling group and
achieve frame synchronization.
1.1.3 Step 3: Cell Primary Scrambling Code Identification
In the above step the UE got the scrambling code group which contains 8 primary
scrambling codes of the local cell. Then the UE performs correlation calculation based on symbol
until it finds the one with the biggest correlation value, so as to determine the primary scrambling
code. After getting this code word, the UE can read the information of the broadcast channel
since both CPICH and PCCPCH use this scrambling code and their channelization codes are
fixed.
1.2 Cell Selection and Cell Reselection
Once the UE is powered on, it will determine whether the current PLMN is suitable or not
according to the system information after it finds a cell. If the PLMN is suitable, it performs cell
measurement and determines whether the current cell is suitable to camp on according to the S
criteria, this is the cell selection procedure. If the current cell cannot meet the S criteria, it will
start the procedure of PLMN selection and cell reselection (It carries out cell reselection in the
current PLMN first. In case of no suitable cell, it carries out PLMN search and goes to another
PLMN for cell reselection and cell selection), and then performs the adjacent cell measurement.
Thereafter, it sequences the cells under measurement according to the R criteria or H criteria,
and it then can camp on the one meeting the S criteria. Of course, cell selection and reselection
are not always carried out during power-on. This procedure will be triggered by other reasons.
1.2.1 Cell Selection
This section introduces the triggering occasions and cell selection procedure, as well as the
criteria for determining Suitable Cell.
1.2.1.1 Triggering occasions:
The UE initiates cell selection in the following cases:
UE power-on
Returning to idle mode from connected mode
cell information lost in connected mode
Failure in finding cell to camp on normally in the cell reselection based on the cell list
provided in the measurement control system information (TS25.133)
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1.2.1.2 PLMN selection
If the UE has obtained the PCCPCH scrambling code from step 3 in Section 1.1, and the
PCCPCH channelization code (SF (ch,256,1)) is known, which is unique in the whole UTRAN,
the UE can read the information of the broadcast channel.
The MIB scheduling information is known, that is, SIB_POS=0 and SIB_REP =8. The UE
can read MIB in the radio frame of the SFN in the value range of (0,8,16, ....). How does UE
acquire SFN? If the SYSTEM INFORMATION message is transmitted on BCH (PCCPCH), the
first field of this message is SFNprime whose value is the initial SFN corresponding to this
transport block. The value range is (0, 2, 4, 6, ..., 4094), but it is (0..2047) after the PER
encoding. In this case, one bit can be saved. Why are the SFN values 0, 2, 4, ...? Because the
BCH TTI is 20ms, including two radio frames. Therefore the step length of the SFNprime field
can be 2 only.
After reading MIB, the UE can determine whether the current PLMN is the one wanted,
because the MIB contains the PLMN identity field. If this is the case, the UE will find other SIBs
and acquire their contents according to the schedulding information of other SIBs in the MIB.
Otherwise, the UE must find another frequency and start this procedure from the beginning,
namely, cell search.
1.2.1.3 Determing Criteria (S criteria)
If the current PLMN is the one wanted, the UE will read SIB3 to acquire Cell selection and
re-selection info, and read Qqualmin, Qrxlevmin and Maximum allowed UL TX power
(UE_TXPWR_MAX_RACH) in the IE of Cell selection and re-selection info for SIB3/4, and
then determine whether the current cell is suitable to camp on according to S criteria.
S criteria:
Srxlev > 0 AND Squal > 0
Where:
Squal = Qqualmeas – Qqualmin
Srxlev = Qrxlevmeas - Qrxlevmin - Pcompensation
Table 1 S criteria parameter description
Parameters Description
Squal It is the quality evaluation value for cell selection, in dBs. It is not suitable for
the TDD and GSM mode. Squal is only used for the FDD cell with the CPICH
Ec/Io as the measurement value.
Srxlev It is the cell selection RX level value, in the unit of dBm.
Qqualmeas It is the cell quality measurement value. The quality of the received signal is
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represented by CPICH Ec/Io. This parameter is used for the FDD mode only.
Qrxlevmeas It is the measurement value of cell receiving level, in the unit of dBm. This
parameter is suitable for CPICH RSCP of the FDD cell, the P-CCPCH RSCP
in the TDD cell and the TXLEV of GSM.
Qqualmin It refers to the minimum quality requirement for cell, in dBs. It is not suitable
for TDD or GSM.
Qrxlevmin It refers to the minimum requirement for cell receiving level, in the unit of
dBm.
Pcompensation It is the max value of (UE_TXPWR_MAX_RACH – P_MAX, 0), in the unit of
dBm.
UE_TXPWR_MAX_RACH It refers to the maximum transmit power of the UE in the RACH of the cell, in
the unit of dBm.
P_MAX It refers to the maximum output power of the UE, indicating the capability of
the UE, in the unit of dBm.
If a cell meets the S criteria, the UE will take this cell as a suitable cell and camp on it, and
then read other system information required. Hereafter, the UE initiates the location registration
procedure.
If the cell does not meet the S criteria, the UE will read SIB11, Measurement control system
information, Intra-frequency measurement system information, Intra-frequency cell info list, cell
info, Primary CPICH info, Reference time difference to cell and Cell Selection and Re-selection
info for SIB11/12. In CPICH info, the UE can get the primary scrambling code. Since the channel
code of CPICH is unique in the whole UTRAN, the UE can measure Qqualmeas and Qrxlevmeas of the
adjacent cell easily (but it requires slot synchronization and frame synchronization) based on the
primary scrambling code and the reference time difference to cell. Moreover, in the IE of Cell
Selection and Re-selection info for SIB11/12, the UE can know the Maximum allowed UL TX
power, Qqualmin and Qrxlevmin of the adjacent cell, so that it can calculate the Squal and
Srxlev of the adjacent cell to determine whether the adjacent cell meets the above selection
criteria or not.
The UE can also read Inter-frequency measurement system information, Inter-frequency cell
info list, frequency info and cell info, and the Cell info is the same as above. The Frequency info
contains UARFCN uplink (Nu) and UARFCN downlink (Nd). Based on all the above
information, the UE can work out Squal and Srxlev of the adjacent cell and determine whether it
meets the S criteria or not.
If the UE cannot find any cell meeting the S criteria, it will consider there is no coverage and
go on with the PLMN selection and reselection procedure.
In idle mode, the UE needs to monitor the signal quality of the current cell and adjacent cell
all the time to select the best serving cell to acquire the service. This is the cell reselection
procedure.
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If the UE finds an adjacent cell meeting the selection criteria, it will camp on this cell and
read other system information required. Then the UE will start the random access and initiate the
location registration procedure.
1.2.2 Cell Reselection
The UE will fulfill the following tasks when it is in normal residence state in the UTRAN:
Monitoring PCH and PICH according to indication of system information;
Monitoring relevant system information;
Carrying out cell measurement procedure to provide data for the cell reselection evaluation
procedure;
The following is the introduction to the triggering occasions and measurement rules of cell
reselection, as well as the criteria for cell reselection evaluation.
1.2.2.1 Triggering occasions
The UE initiates cell reselection in the following cases:
Time triggering in idle mode (with the quality measurement value of the current service cell
being smaller than intra-frequency measurement threshold)
When the UE in idle mode cannot find any service cell meeting the S criteria within Nserv
DRXs (in spite of the setting in system information)
When the UE detects that it is in a “non-service area”
1.2.2.2 Measurement rules
Measurement rules for non Hierarchical Cell Structure (HCS) cells
If the cell broadcast system information indicates that the HCS is not adopted, the UE
decides to perform the corresponding measurement according to the following rules: (Note: in
the CPICH Ec/Io measurement status, Squal corresponds to Sx, in the CPICH RSCP
measurement status, Srxlev corresponds to Sx)
Intra-frequency measurement
If Sx>Sintrasearch, UE does not need to perform intra-frequency measurement.
If Sx<=Sintrasearch, UE needs to perform intra-frequency measurement.
If the system information does not contain Sintrasearch, UE needs to perform intra-frequency
measurement for all cases.
Inter-frequency measurement
If Sx>Sintrasearch, UE does not need to perform inter-frequency measurement.
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If Sx<=Sintrasearch, UE needs to perform inter-frequency measurement.
If system information does not contain Sintrasearch, UE need to perform inter-frequency
measurement in all cases.
Inter-system measurement
If Sx>SsearchRATm, UE does not need to measure system “m”.
If Sx<=SsearchRATm, UE needs to perform the inter-system measurement to measure system
“m”.
If system information does not contain SsearchRATm, UE needs to perform cell measurement
on system “m” in all cases.
Measurement rules for HCS cells
If the cell broadcast system information indicates that HCS is adopted, the UE decides to
perform the corresponding measurement according to the following rules:
Measurement rules based on intra-frequency and inter-frequency thresholds
IF (Srxlevs<=SsearchHCS) or (IF FDD and Sx<=Sintersearch), THEN
Measure on all intra-frequency cells and inter-frequency cells
ELSE IF (Sx>Sintrasearch)
Measure on all intra-frequency and inter-frequency cells with higher priority than the current
service cell, but not in the case when the UE is in fast moving mode
ELSE
Measue on all intra-frequency and inter-frequency cells of the current hierarchy or higher
priority hierarchy, but not in the case when the UE is in fast moving mode
Measurement rules for intra-frequency and inter-frequency with UE in fast moving mode
Within the time of TCRmax, if the times of cell reselection is greater than NCR, the UE will enter
the high-speed moving mode, in which, it will operate as follows:
1. Execute intra-frequecy and inter-frequency measurements in adjacent cells in the same
hierarchy or lower hierarchy.
2. In cell reselection, assign the intra-frequency and inter-frequency measurements in the
adjacent cell of the lower hierarchy than the current HCS service hierarchy.
3. If the times of cell reselection is not greater than NCRmax within the time of TCRmax, and if
the times does not exceed the NCRmax after the UE carries on the current measurement within the
time of TCRHyst, the UE will returns to the threshold-based measurement.
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Inter-system measurements in HCS:
Threshold rules for inter-system measurement
IF (Srxlevs<=SHCS,RATm) or (Squal<=SSearchRATm FDD only), THEN
The UE measures all cells adopting the RATm technology.
ELSE IF (Sx>Slimit,SearchRATm)
It is unnecessary for the UE to measure adjacent cells adopting the RATm technology.
ELSE
The UE measures all adjacent cells adopting the RATm technology no matter what priority
they have in the HCS. But the case of UE in fast moving mode is expected.
Inter-system measurement rules for UE in the fast moving mode
Within the time of TCRmax, if the time of cell reselection is greater than NCR, the UE will enter
the high-speed moving mode, in which it will operate as follows:
1. Execute the system RATm measurements in adjacent cells in the same hierarchy or lower
hierarchy.
2. In cell reselection, assign the RATm measurements in the adjacent cell of the lower
hierarchy than the current HCS service hierarchy.
3. If the time of cell reselection is not greater than NCRmax within the time of TCRmax, and if the
times does not exceed the NCRmax after the UE performs the current measurement within the time
of TCRHyst, the UE will return to the threshold-based measurement.
1.2.2.3 Judging criteria (H criteria and R criteria)
Excecute cell reselection evaluation in these cases:
UE internal triggering, refer to the relevant specifications in 25.133.
Information changes for cell reselection evaluation procedure on the BCCH
The following is the introduction to the H criteria and R criteria suitable for the
intra-frequency/inter-frequency measurement and inter-system measurement:
The H criteria are used for sequencing the hierarchies in the HCS, as the priority reference
for cell reselection.
Hs = Qmeas,s - Qhcss
Hn = Qmeas,n - Qhcsn – TOn * Ln
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If the system information indicates HCS is not adopted, the H criteria will be invalid.
The R criteria for cell sequencing are as follows:
Rs = Qmeas,s + Qhysts
Rn = Qmeas,n - Qoffsets,n - TOn * (1 – Ln)
Where:
TOn = TEMP_OFFSETn * W(PENALTY_TIMEn – Tn)
Ln = 0 if HCS_PRIOn = HCS_PRIOs
Ln = 1 if HCS_PRIOn <> HCS_PRIOs
W(x) = 0 for x < 0
W(x) = 1 for x >= 0
The parameter TEMP_OFFSETn, defined for the H criteria and R criteria, is the offset of the
adjacent cells within the PENALTY_TIMEn. The two parameters of TEMP_OFFSETn and
PENALTY_TIMEn are suitable for the HCS cells only (which are designated in the system
information).
Each adjacent cell is assigned with a timer Tn, which will be reset when the following
conditions are met:
If HCS_PRIOn <> HCS_PRIO and Qmeas_LEV,n > Qhcsn
Or
If HCS_PRIOn = HCS_PRIO and
if the measurement value is set to CPICH RSCP for the FDD cell and the adjacent cells,
Qmap,n > Qmap,s + Qoffset1s,n
if the measurement value is set to CPICH Ec/No for the FDD cell and the adjacent cell
Qmeas_LEV,n > Qmeas_LEV,s + Qoffset2s,n
for other types of cells:
Qmap,n > Qmap,s + Qoffset1s,n
If the above conditions are not met, Tn should stop counting immediately. TQn is valid only
when Tn is counting; otherwise, it should be set to 0.
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The cell reselection procedure and Tn are still valid after the UE selects a new cell, unless
the above conditions are not met or the cell is not the adjacent cell of the selected cell any more.
However, the system information of the new system after the new cell is selected should be used
to evaluate the above criteria.
Table 2 Cell reselection parameter description
Parameters Description
Sn The cell selection value of adjacent cells (db)
Qmap,s It is the quality mapping value of the service cell, including the CPICH RSCP
and CPICH Ec/No in the FDD mode, CPICH P-CCPCH RSCP in the TDD
mode and the RXLEV of the GSM. The parameters of the mapping functions
are provided by the cell_selection_and_cell_quality_measure section of the
system information.
Qmap,n It is the quality mapping value of the service cell, including the CPICH RSCP
and CPICH Ec/No in the FDD mode, CPICH P-CCPCH RSCP in the TDD
mode and the RXLEV of the GSM. The parameters of the mapping functions
are provided by the cell_selection_and_cell_quality_measure section of the
system information.
Qmeas_lev It is the quality value of the signal received provided in the
cell_selection_and_cell_quality_measure section of the system information.
It is represented by in CPICH RSCP the FDD mode, and P-CCPCH RSCP in
the TDD mode and RXLEV in the GSM.
The UE sequences these cells meeting the S criteria according to the R criteria:
The cells with the highest HCS_PRIO meeting the H criteria, that is, H is greater than or
equal to 0. This is not for the case when the UE is in the fast moving mode.
If HCS is not considered, or no cell meets the H criteria, the UE will sequence all cells.
In all the cases, a cell will be selected only when it meets all the criteria above within the
time of Treselect.
Table 3 Description of the parameters of cell reselection in system information broadcasts
Parameters Description
Qoffset1s,n It is the offset between two cells, used for the CPICH RSCP in the TDD, GSM
and FDD mode.
Qoffset2s,n It is the offset between two cells, used for the CPICH Ec/No in the TDD, GSM
and FDD mode.
Qhyst1s It is the hysteresis value, used for the CPICH RSCP in the TDD, GSM and
FDD mode.
Qhyst2 It is the hysteresis value, used for the CPICH Ec/No in the TDD, GSM and
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FDD mode.
HCS_PRIOs, HCS_PRIO It is the priority assigned to service cell and adjacent cell, in the value range of
(0-7).
Qhcss, Qhcsn It is the quality threshold of the service cell and adjacent cell in the cell
reselection in HCS.
Qqualmin It is the minimum quality standard designated to the cell, in the unit of db. It is
used for CPICH Ec/No of FDD only.
Qrxlevmin It is the minimum receiving level, in the unit of dBm, TEMPORARY_OFFSET1n
PENALTY_TIMEn It refers the time duration for which the TEMPORARY_OFFSETn is applied for
a neighbouring cell.
TEMPORARY_OFFSET1n It is the offset of applying the H and R criteria within the penaltiy time, used for
the CPICH RSCP in the TDD, GSM and FDD mode.
TEMPORARY_OFFSET2n It is the offset of applying the H and R criteria within the penalty time, used for
the CPICH Ec/No in the FDD mode.
TCRmax It indicates the maximum time spent for cell reselection.
NCR It is the maximum times of cell reselection
TCRmaxHyst It refers to the hysteresis time for the UE resumes to the normal mode from the
high-speed moving mode.
Treselections It indicates the value of the cell reselection counter (for designating the
hysteresis time for cell reselection)
SsearchHCS It specifies the threshold for the UE to perform measurement on the adjacent
cell when HCS is adopted.
SsearchRAT 1 - SsearchRAT k It specifies the threshold for the startup of the measurement on the system
RATm.
SHCS,RATm It specifies the threshold for the UE to perform inter-system measurement on
the adjacent cell when HCS is adopted.
Sintrasearch It specifies the threshold for intra-frequency measurement. It is used in the
HCS measurement criteria.
Sintersearch It specifies the threshold for inter-frequency measurement. It is used in the
HCS measurement criteria.
Slimit,SearchRATm It indicates the measurement criteria for cell reselection in HCS. It is used to
designate the time when the UE starts up the inter-system measurement
(RATm) on the adjacent cell.
1.3 Random Access
Random access procedure is the procedure when an MS requests access to the system,
receives the response of the system and is allocated with dedicated channel. (Note: If the RRC
connection is set up on the common control channel (CCCH), the system does not need to
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allocate DCCH. If the RRC connection is set up on the dedicated control channel (DCCH), the
system needs to allocate DCCH). This procedure is attached once the MS is powered on, and
will be detached when the MS is powered off, location area update, routing area update, and
signalling connection setup process for executing any service. The 3GPP 25.211 protocol
defines the random access channel (RACH) and physical random access channel (PRACH), as
well as the frame structure of the access channel and physical-layer timing relation. The 3GPP
25.213 defines the spread spectrum demodulation of the domudulation and message parts (data
and control) of the access channel preamble code, as well as the preamble code, scrambling
code and spread code. The 3GPP 25.214 protocol defines the access procedure. The following
are the further description of these contents.
1.3.1 Random Access Channel
RACH, an uplink common transport channel, maps to PRACH, which is an uplink physical
common channel. RACH is always received by NodeB in the whole cell. It features collision and
adopting open loop power control.
The RACH transmission is based on a Slotted ALOHA approach with fast acquisition
indication (AI). The MS can start the transmission at a pre-defined time offset, which is
represented by an access slot. Two 10-ms radio frames constitute a 20ms access frame, which
are divided into 15 access slots, with an interval of 5120 chips (with the time of 1.332ms). Figure
1 shows the timing information and AI on the access slot, as well as the number of access slots
and the interval between them. The high-layer signalling indicates the access slot whose
information is available in the current cell.
#0 #1 #2 #3 #4 #5 #6 #7 #8 #9 #10 #11 #12 #13 #14
5120 chips
radio frame: 10 ms radio frame: 10 ms
Access slot
Random Access Transmission
Random Access Transmission
Random Access Transmission
Random Access Transmission
Figure 1 Number of RACH access slots and interval between them
The user can initiate random access transmission at the start time of each access slot.
Figure 2 shows the structure of the random access transmission, which is composed of one or
more message parts of 10ms or 20ms in length.
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Message partPreamble
4096 chips10 ms (one radio frame)
Preamble Preamble
Message partPreamble
4096 chips 20 ms (two radio frames)
Preamble Preamble
Figure 2 Structure of random access transmission
The preamble of the random access is 4096 chips, including 256 repetitions of a 16-chip
signature. There are 16 different signatures in all.
The 10-ms message of random access is divided into 15 slots, each of which is 2560 chips
in length. Each slot includes two parts, one is data part, which the RACH transport channel maps
to; the other is the control part, which is used to transport the L1 control information. The data
and control parts are transmitted simultaneously in code multiplexing mode. A 10-ms message
part is composed of one radio frame, and a 20-ms message part is composed of two continuous
10-ms radio frames. The length of the message part can be determined by the signature and/or
access slot used. This is configured by the high layer.
The data part includes 10*2k bits, where, k=0, 1, 2, 3. The data part of the message
corresponds to the spread factors of 256, 128, 64 and 32.
The control part includes eight known pilot bits (used for supporting the channel estimation
for correlation detection) and two TFCI bits. For the message control part, this corresponds to the
spread factor of 256. For the pilot bit pattern, refer to the 3GPP TS 25.211 protocol. The total
number of TFCI bits in the access message is 152, that is 30. The TFCI value corresponds to
the transport format of the current random access message. When the PRACH message part is
20ms in length, the TFCI will repeat in the second radio frame.
The downlink AICH is divided into downlink access slots, each of which is 5120 chips in
length. The downlink access slot is aligned with the PCCPCH in terms of time. The uplink
PRACH is divided into uplink access slots, each of which is 5120 chips. The nth uplink access
slot are transported the p-a chips before the UE receives the nth downlink access slot (where
n=0, 1, …14). The downlink AI is transmitted at the beginning of the downlink access slot.
Similarly, the preamble and message part of the uplink RACH are transmitted at the beginning of
the uplink access slot. Figure 3 shows the PRACH/AICH timing relation.
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One access slot
p-a
p-mp-p
Pre-amble
Pre-amble Message part
Acq.Ind.
AICH accessslots RX at UE
PRACH accessslots TX at UE
Figure 3 PRACH-AICH timing relation from the view of UE
The preamble-preamble code distance p-p should be greater than or equal to the minimum
preamble-preamble code distance p-p,min, that is p-p p-p,min.
The distance from the preamble to the AI p-a, and the distance from the preamble to the
message p-m are as shown below:
When AICH_Transmission_Timing is set to 0, then
p-p,min = 15360 chips (3 access slots)
p-a = 7680 chips
p-m = 15360 chips (3 access slots)
When AICH_Transmission_Timing is set to 1, then
p-p,min = 20480 chips (4 access slots)
p-a = 12800 chips
p-m = 20480 chips (4 access slots)
The parameter AICH_Transmission_Timing is provided through the signalling mode.
1.3.2 Random Access Procedure
After the physical layer of the UE receives the PHY-DATA-REQ primitive request of the
MAC sublayer, the UE will start the physical random access procedure. Refer to the 3GPP TS
25.321 protocol.
Before the physical random access procedure is initiated, the layer 1 (physical layer) of the
UE should be able to receive the following system information from the high layer of the UE
(RRC layer):
Scrambling code of the preamble part
Length of the message part, 10ms or 20ms
Formatted: Bullets and Numbering
Formatted: Bullets and Numbering
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The value of AICH_Transmission Timing (0 or 1)
The signature set and RACH access subchannel group set assigned for the SN of each
ASC (access subchannel)
The parameter of Power_Ramp_Step (integer > 0)
The parameter of Preamble_Retrans_Max (integer > 0)
The parameter of Preamble_Initial_Power
The power used for the last preamble transmission and the offset of the transmission
power of the control part in the random access message P p-m = Pmessage-control – Ppreamble, in
the unit of dB.
TFS parameters, including the power offset of the data part and control part of the random
access message for every transmission format.
Please note that the above parameters may be updated by the high layer before the
physical random access procedure is initiated every time.
In addition, before the physical random access procedure is initiated, layer 1 should be
able to receive the following information from the MAC layer:
The transmission format used for the PRACH message part
ASC transmitted by PRACH
Data to be transmitted (TBS)
When initiating the physical random access, the UE needs to operate according to the
following procedure:
Step 1: It determines the available RACH access subchannel set according to the
designated ASC and the available uplink access slot set in the next complete access slot set
(SFN mod 2 = 0 and SFN mod 2 = 1, where the former one is called access slot set 1, and the
latter one is called access slot set 2), and then selects one uplink access slot randomly. The rule
for random selection is equal probability selection. If no access slot set is available currently, it
selects one in the next access slot set at random.
Step 2: It selects the signature randomly from the signature set according to the designated
ASC. The rules for random selection are equal probability selection.
Step 3: It sets the initial value of the preamble retransmission counter to
Preamble_Retrans_Max.
Step 4: It sets the parameter Commanded Preamble Power to Preamble_Initial_Power.
Step 5: If the value of Commanded Preamble Power exceeds the largest allowed value, it
will set the transmission power of the preamble to the maximum allowed transmission power. If
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the value of Commanded Preamble Power is less than the minimum value required (specified
in the 3GPP TS 25.101 protocol), it will set the transmission power of the preamble to the current
calculation value (which may be greater than, less than or equal to the Commanded Preamble
Power). Otherwise, it sets the transmission power of preamble to Commanded Preamble
Power. It transmits the preamble by using the selected uplink access slot, signature and
preamble transmission power.
Step 6: It waits for the NodeB to return an acknowledgement for the used signature. If the
UE cannot detect the AI of +1 or -1 on the downlink access slot with the same number as the
uplink access slot used for transmitting preamble, it will select an available uplink access slot at
random. Then it adds Commanded Preamble Power according to the power ramp step P p-m =
Pmessage-control – Ppreamble, and then subtract the preamble reset counter by 1. If Commanded
Preamble Power is greater than the maximum power threshold 6dB, the UE will report the
status of layer 1 (No ack on AICH) to the MAC layer, and then exit the physical random access
procedure. Thereafter, if the value of the retransmission counter is greater than 0, repeat Step 6;
otherwise, report the status of layer 1 (No ack on AICH) to the MAC layer, and exit the physical
random access procedure
Step 7: If the received value of AI for UE is -1, it will report the status of layer 1 (No ack on
AICH) to the MAC layer, and then exit the physical random access procedure.
Step 8: If the received value of AI for UE is +1, it will transmit the random access message
part three or four uplink access slots after the last time of preamble transmission according to the
value of AICH_Transmission_Timing. The transmission power of the control part of the random
access message should be P p-m higher than the power for the last preamble transmission. For
that of the data part, refer to the protocol.
From the view of the operation flow of the random access procedure, the UE needs to
transmit preamble before initiating an access, and then waits for the acknowledgement from
NodeB. Then the NodeB detects the preamble transmitted by the UE in each uplink slot. It will
return an AI through the AICH channel if it finds a preamble. The UE detects AI in a specific
downlink access slot after transmitting the preamble. If it receives a permission AI, it continues to
transmit the message part, so as to complete a physical random access. If it does not receive
any AI, the UE will repeat the handshake process of “transmit preamble–detect AI” for N times
(preset), and start transmitting the message part, to complete a physical random access. If the
UE receives a rejection AI, it will exit this random access procedure, and then report the status.
The message of the random access message part includes the flag information of the UE, the
service type requested, and so on.
The following shows the access subchannels and the definitions of access slot sets, with the
following example:
Table 4 Relation between access subchannel and access slot and SFN
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SFN modulo 8 of
corresponding P-CCPCH
frame
Subchannel number
0 1 2 3 4 5 6 7 8 9 10 11
0 0 1 2 3 4 5 6 7
1 12 13 14 8 9 10 11
2 0 1 2 3 4 5 6 7
3 9 10 11 12 13 14 8
4 6 7 0 1 2 3 4 5
5 8 9 10 11 12 13 14
6 3 4 5 6 7 0 1 2
7 8 9 10 11 12 13 14
AICH accessslots
10 ms
#0 #1 #2 #3 #14#13#12#11#10#9#8#7#6#5#4p-a
#0 #1 #2 #3 #14#13#12#11#10#9#8#7#6#5#4
PRACHaccess slots
SFN mod 2 = 0 SFN mod 2 = 1
10 ms
Access slot set 1 Access slot set 2
Figure 4 Definition of access slot set (with the example of uplink/downlink access slot fixed difference p-a 7680chips)
2 Signalling Messages of Access Procedure
Before the access procedure, the UE needs to receive the cell system information broadcast
message of the UTRAN. The following is the introduction to the meanings and applications of
these signalling messages and information elements (IE).
2.1 System Information Broadcast
2.1.1 System Information Structure
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Figure 5 System information structure
System IEs are broadcast in system information block (SIB). The system IEs with the same
character are combined to an SIB. Different SIBs may have different characters, for example, the
periodical repetition rate and the requirement on SIB re-read of the UE.
The system information is organized as a tree, as shown in Figure 5. As the reference of
large numbers of SIBs in a cell, the primary information block contains the sequence of these
SIBs. The upper level SIB functions the same on the blocks of the lower level. The referenced
SIB must have the same function range and update mechanism with the SIBs of the upper level.
Some SIBs may be present for several times with different contents. In this case, the
sequence for each present of the SIBs must be provided. At presently, this is only suitable for the
SIB type 16.
The following table shows the description of each system information block.
Table 5 System information block
SIB RRC Protocol
State
Description Size
[TTI]
1 Idle mode Contains the NAS information and the information of the timers and
counters of the UE in idle mode and connected mode
1
2 Connected mode Contains the URA identity and the periodical cell updating and URA
updating information
1
3 Idle mode Contains the parameters of cell selection and reselection read by the UE
in idle mode
1
4 Connected mode Contains the parameters of cell selection and reselection read by the UE
in connected mode
(1)
5 Idle mode Contains the configuration parameters of the common channel read by
the UE in idle mode
3
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SIB RRC Protocol
State
Description Size
[TTI]
6 Connected mode Contains the configuration parameters of the common channel and
common physical channel read by the UE in connected mode
(3)
7 Idle mode
Connected mode
Contains the parameters of fast variance (UL-Interference and dynamic
persistence level)
0.5
8 Connected mode
(FDD only)
Contains the static CPCH information 1.5
9 Connected mode
(FDD only)
Contains the CPCH information 0.5
10 CELL_DCH
(FDD only)
Contains the Dynamic Resource Allocation Control (DRAC)
procedure information
-
11 Idle mode Contains the adjacent cell list and measurement control information read
by the UE in idle mode
1-10
12 Connected mode Contains the adjacent cell list and measurement control information read
by the UE in connected mode
(1-10)
13 Idle mode
Connected mode
Contains the ANSI-41 information 1
13-1 Idle mode
Connected mode
Contains the ANSI-41 RAND information 0.5
13-2 Idle mode
Connected mode
Contains ANSI-41 user zone ID 0.5
13-3 Idle mode
Connected mode
Contains the ANSI-41 private neighbour list 0.5
13-4 Idle mode
Connected mode
Contains ANSI-41 service redirect information 0.5
14 Idle mode
Connected mode
(TDD only)
Contains the uplink outloop function control information read by the UE in
the idle and connected mode
-
15 Idle mode
Connected mode
Contains the LCS information supported 1
16 Idle mode
Connected mode
Contains the RB used for handover and the parameters of the transport
channel and physical channel read and stored by the UE in the idle and
connected modes.
3
18 Idle mode
Connected mode
Contains the PLMN ID of the Neighboring cell
2.1.2 System Information Broadcast Procedure
According to the protocol, the system information message transmits the SIB on the BCCH,
and BCCH can be mapped to the BCH or FACH, so the size of the system information message
should be in accord with the size of the BCH or FACH. The RRC layer is responsible for the
cascading (when the size of the SIB is less than that of the transport block of the BCH or FACH)
and segmentation of the SIB (when the size of the SIB is greater than that of the transport block
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of the BCH or FACH). The UE in the CELL_PCH/URA_PCH/CELL_FACH state reads the
system information on the BCH transport channel. If the UE is powered off, all the SIBs stored
previously will become invalid after the cell or PLMN reselection, and the UE should re-read and
store them. For the SIB with the value tag, the UE should update them according to Section
8.1.1.4.1 and Section 8.1.1.4.2 in the 25.331 protocol; for the SIBs with expiration timer, the UE
should update them according to Section 8.1.1.4.2 of the 25.331 protocol. If the PAGING TYPE 1
message received by the UE indicates system information change, the UE should re-read the
system information.
There is no reading when the UE is in the CELL_DCH state. The UTRAN instructs the UE in
the CELL_FACH state to read through the system information update indication, and instructs
the UE in the CELL_PCH state to read through paging.
The features of the BCH are: 1) It has downlink only; 2) the fixed rate is low; 3) it requires full
cell coverage. The broadcast on the BCH can use the system information on NodeB, and the
information is updated frequently (every 20 to 100ms, for example, the uplink interference value
of the cell). For the system information come from CRNC, the update frequency is much lower
than the broadcast repetition frequency on the BCH.
The PCCPCH is used to bear the BCH transport channel as a downlink physical channel,
with the fixed rate of 30k bps, and the SF of 256. Its transmission is stopped in the former 256
chips of each slot, which are used to transmit PSCH and SSCH. That is, the PCCPCH, PSCH
and SSCH are transmitted in time division mode.
As the PCCPCH transmits the cell SFN, it can act as the direct frame timing reference of the
downlink and the indirect frame timing reference of the uplink for all the physical channels. All the
channels of SCH (primary and secondary), CPICH (primary and secondary), PCCPCH and
PDSCH have the same frame timing. The frame timimg of the SCCPCH may vary with different
SCCPCH, but the difference between it and the frame timing of the PCCPCH is the multiples (0
to 149 times) of the 256 chips. The frame timing of the PICH is 7680 chips ahead of that of the
SCCPCH. Thus the UE can read to see whether there is PI on the PICH. If so, it can read the
corresponding PI from the subsequent SCCPCH (PCH). The frame timing of the DPCH may vary
with the different DPCHs. But the difference between it and the frame timing of the PCCPCH is
the multiples of 256 chips (0 to 149 times).
The system information broadcast procedure is used to broadcast system information to the
UE in the idle or connected mode. The system information is delivered on the BCCH. The BCCH
can be mapped to the BCH or FACH common transport channel. The purpose of system
information update is the NodeB can apply the scheduling and the system information segment
contents on the BCCH. The NodeB should also be consistent with the MIB/SB/SIB in this
message on the BCCH. If the SYSTEM INFORMATION UPDATE REQUEST message contains
the BCCH Modification Time IE, NodeB will apply the BCCH scheduling information (includng
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the combination of IB adding, reducing and content updating) for the first time according to the
value of the SFN set by this IE. Otherwise, NodeB will update the scheduling information on the
BCCH as much as possible. Refer to the message analysis in Section 5.
2.1.3 System Information Update
The UE and the UTRAN may use different mechanisms for SIB update. If the SIB contains a
value tag, the UTRAN should indicate the time to change an IE. This time is determined by
means of changing the value tag. Even though the value tag is not changed, the UE should
consider that the SIB will become invalid six hours after it is received. In addition, such SIBs exist,
in which the IEs are changed too frequently to indicate the change with the value tag. Such SIBs
are not related to the value tag in the primary information block or the value tag of the upper-level
SIB. The stored SIB should be taken as invalid after the UE is powered off.
Modifying SIB with value tag
When the system information is changed, the UTRAN should execute the following
operations to indicate the UE of these system information changes.
1. It updates the system information in the SIB
2. It updates the upper-level SIB with the “value tag” in the updated SIB if the updated
SIB is connected to the upper-level SIB
3. It updates the primary information block with the “value tag” in the updated SIB or the
upper-level SIB, and changing the value tag in the primary information block
4. It transmits the new primary information block on the BCH mapped by the BCCH, and
then the updated SIB
5. It transmits the new primary information block on the FACH mapped by the BCCH, so
that all the UEs in the CALL_FACH state can get the information. The UTRAN can
retransmit the new primary information block on the FACH so as to increase the
correct receiving rate of this information.
6. It transmits the PAGING TYPE 1 message on the PCCH, so that the UEs in the idle or
connected (CELL_PCH or URA_PCH) mode can get the information. In the IE of
BCCH Modifacation Information in the PAGING TYPE 1 message, the UTRAN should
indicate the new value tag for the primary information block. The PAGING TYPE 1
message should be transmitted in all paging occasions. For the BCCH Modification
Information on the PCH, the system information should not be changed to frequently,
but should coordinate with the maximum DRX cycle supported by the UTRAN.
7. After receiving the PAGING TYPE 1 message, the UE should check the “value tag” of
the primary information block indicated in the IE of BCCH Modification Information. If it
is different from the value stored in the VALUE_TAG, and then read the new primary
information block according to the present sequence information.
8. After the UE receives the new primary information block on the BCH or FACH mapped
Formatted: Bullets and Numbering
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by the BCCH, it should store the new “value tag” (transmitted in the VALUE_TAG
variable in the primary information block, and then check the IE of value tag of all SIBs
used by the UE. If there is change, the UE should read this SIB. After receiving the
modified SIB, the UE executes the operations specified in Section 8.1.1.5 of the
25.331 protocol.
Modifying system information without value tag
When the UE knows that the SIB contains no value tag, it should start up a timer, whose
value equals to the repetition cycle of the SIB (SIB_REP). When the timer expires, the
information transmitted by this SIB should be taken as invalid. Before using the value contained
in the system IE, the UE should get the new SIB. After receiving the modified SIB, the UE
executes the operations specified in Section 8.1.1.5 of the 25.331 protocol.
Time critical modification of SIB
For the modification of some system IEs (for example, re-configuration of the channel), it is
essential to know the time of the modification. In this case, the UTRAN executes the following
operations to notify the UE of these changes:
1. It transmits the PAGING TYPE 1 message on the PCCH, so that the UE in the CELL_PCH
and URA_PCH state can acquire the information. In the BCCH Modification Information, the
UTRAN should indicate the change time and the new value tag suitable for the primary
information block after the change. The PAGING TYPE 1 message should be transmitted in
all paging occasions (it is the continuous 256 frames at present (with the paging cycle of
2^8 ). (The PIs of the CN will be discarded in this case).
2. It transmits the SYSTEM INFORMATION CHANGE INDICATION message on the FACH
mapped by the BCCH, so that all the UEs in the CELL_FACH state can acquire the
information. In the IE of BCCH Modification Information, the UTRAN should indicate
change time and the new value tag suitable for the primary information block after the
change. The UTRAN can repeat transmitting the SYSTEM INFORMATION CHANGE
INDICATION message on the FACH so as to increase the correct receiving rate of this
information.
3. The UE updates the system information, and changes the “value tag” in the corresponding
SIB.
4. If the updated SIB is connected to the upper-level SIB, the UE updates the upper-level SIB
with the “value tag” in the updated SIB.
5. It updates the new information block with the “value tag” in the updated SIB or the
upper-level SIB, and changes the “value tag” of the primary information block.
6. When the designated time comes, it transmits the new primary information block on the BCH
mapped by the BCCH, and then transmits the updated SIB on the BCCH.
7. After receiving the PAGING TYPE 1 or SYSTEM INFORMATION CHANGE INDICATION
message, the UE should wait until the time indicated by the IE BCCH Modification
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Information comes, and then read the new primary information block.
8. When receiving the new primary information block, the UE should store the “value tag” of the
new primary information block, and check the IE of value tag of all SIBs used by the UE. If it
is different from the value stored in the VALUE_TAG, the UE will read corresponding SIB.
After receiving the modified SIB, the UE executes the operations specified in Section 8.1.1.5
of the 25.331 protocol.
9. If the UE cannot find the primary information block, it considers that the physical
re-configuration has happened, and then carries out new cell searching.
2.1.4 Description of IEs of SIBs
Here only provides the description of the IEs of the SIBs realized by RNC V1.2.
2.1.4.1 MIB:
By comparing the latest MIB tag, the UE can determine whether to update the MIB
information stored previously.
MIB contains some basic information of the access network, such as PLMN information,
MNC and MCC.
It contains the scheduling information of other SIBs (SB1, SB2 and SIB1). Where, the
scheduling information of SB1 and SB2 must be put in the MIB, and that of others can be
put in SB1 and SB2.
2.1.4.2 SIB1:
NAS information
CN DOMAIN information:
T3212: CS domain periodical location update, once every 1/10 hour;
T3312: SGSN MM periodical route update;
NMO: no GS information between SGSN and MSC/VLR, with NMO being 1;
DRX: it is equal to 2^K * PBP, with K being the DRX cycle length coefficient of the CN
domain, and PBP being the number of paging block cycles, and FDD being 1.
The timer and counter constants of the UE in connected mode: the timer constant used for
the UE capability information (T304), the timer constant used for RRC connection release
completion (T308), the timer constant used for cell reselection in connected mode (T309),
the timer constant used for transmitting the PUSCH capability request (T310), the timer
constant used for selecting PUSCH allocation hangup in the physical common shared
channel allocation (T311), the timer constant used for out-of-sync. Indication in connected
mode (T313), the timer constant used for indicating radio link failure (T314 and T315).
Formatted: Bullets and Numbering
Formatted: Bullets and Numbering
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Various timer constants of the UE in idle mode: The timer constant used for RRC
connection setup (T300) and the synchronization indication timer constant used for creating
dedicated channel (T312).
Note: [1] In this version of protocol, the UE does not use T301 or N301. The UE starts the
timer T302 after transmitting CELL UPT/URA UPT, and stops this timer after the receiving
CONFIRM. Once the timer expires, and if V302<=N302, the UE will retransmit CELL/UPT/URA
UPT.
[2] The UE starts the timer T304 after transmitting UE CAPABILIRY INFO, and stops this
timer after receiving CONFIRM. Once the timer expires, and if V304<=N304, the UE will initialize
cell updating procedure.
[3] The UE in the CELL_FACH/URA_PCH/CELL_PCH state starts T304 (or T305) after
receiving CELL UPT/ URA UPT, and stops this timer after it enters other state. Once the timer
expires and if T307 is not initiated, and the UE detects it is in the service area, it will transmit
CELL UPT; otherwise, the UE will start T307 if it is not initiated
[4] The UE starts the timer T307 when T305 expires and the UE detects it is out of the
service area, and tops T307 when it enters the service area again. Once the T307 expires, the
UE enters the idle state. The UE starts the T308 after transmitting RRC REL COMPLETE, and
stops T308 after the receiving CONFIRM.
[5] Once the timer expires, and if V308<=N308, the UE will transmit RRC REL COMPLETE;
otherwise, it will enter idle mode.
The UE starts the timer T309 after reselecting a cell belonging to other radio access network
or receiving the CELL CHANGE ORDER FROM UTRAN message in connected mode, and
stops this timer after setting up connection in a cell successfully. Once the timer expires, the UE
will keep connecting with the UTRAN.
[7] The UE starts the timer T310 after transmitting PUSCH CAPACTITY REQUEST, and
stops this timer after receiving CHANNEL ALLOCATION. Once the timer expires, and if
V310<=N310, the UE will transmit PUSCH CAPACTITY REQUEST; otherwise, the procedure
will end.
[8] The UE starts the timer T311 after receiving PHYSICAL SHARED CHANNEL
ALLOCAION, with the item of PUSCH allocation set to PUSCH allocation pending. If the item
of PUSCH allocation is set to PUSCH allocation assignment, and the timer expires, the UE
will retransmit the PUSCH capability request procedure.
[9] The UE starts the timer T312 after setting up DCH, and stops this timer after detecting
N312 (the maximum number of continuous in-sync indications received from L1) continuous
in-sync indications. If the timer expires, it means out-of-sync.
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[10] The UE starts the timer T313 after tdetecting N313 (the maximum number of continuous
out-of-sync indications received from L1) continuous out-of-sync indications, and stops this timer
after detecting N315 (the maximum number of continuous in-sync indications received from L1
during the timing period of T313) continuous synchronization indications. Once the timer expires,
the radio link will be disconnected.
[11] The UE starts T314 only when the radio link failure criteria are met and the radio bearer
associated with the T314 timer exists, and stops this timer when the cell updating procedure is
completed. For the case of timeout, refer to Section 8.3.1.13 of the 25.331 protocol. According to
the protocol, when the cell updating procedure is initiated for RRC connection re-setup, and if
either T314 or T315 expires, and T302 is not running, it is necessary to release the RAB related
to T314/T315. However, RR does not support the crossing flow for the cell updating and RAB
configuration releasing, so T314/T315 should be set to 0 or a value greater than T302N302.
[12] The timer T316 is initiated when the UE in the URA_PCH/CELL_PCH detects it is out of
the service area, and this timer is stopped when the UE detects it enters the service area again.
If the UE is in the service area, it initiates the cell updating procedure, and the timer T317 is
initiated. When the UE detects the state is transited to CELL_FACH after entering the service
area and initiates the cell updating procedure, the UE will enter idle mode once T317 expires.
[13] The UE starts the timer after transmitting RRC REQ, and stops this timer after receiving
RRC CON SETUP. Once the timer expires, and if V300<=N300, the UE will retransmit RRC
REQ.
2.1.4.3 SIB2:
URA Identity List
2.1.4.4 SIB3:
CellIDentity
CellSelectReselectInfo: mappingInfo, cellSelectQualityMeasure, cSIntraSearchl,
cSInterSearch, Q-QualMin, Q-RxlevMin, RAT-FDD-InfoList, MaxAllowedUL-TX-Power,
Q-Hyst-S, T-Reselection-S and HCS-ServingCellInformation.
CellAccessRestriction
Note: (The following is the description of the functions of this IE on the cell selection and
reselection, cell access and emergency call.)
1. Cell state. There are three types of IEs that can indicate the current state of this cell in
the system information of CELL ACCESS RESTRICTION: Cell barred (in the IE type of barred or
not barred), Cell Reserved for operator use (in the IE Type of reserved or not reserved, Cell
Reserved for SoLSA exclusive use (in the IE type of reserved or not reserved).
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2. Cell selection and reselection. When all the above three IEs are in the NOT_XXX state,
this cell can be selected in the cell selection and reselection in the connection and idle mode.
When the cell is in the not barred or not reserved for operator use or reserved for SoLSA state,
the UE that does not support SoLSA cannot access this cell. When the cell is in the state of not
barred or reserved for operator use, the users with the AC level of 11 to 15 in the home PLMN
can access this cell. The users with the AC level of 0 to 10 cannot access this cell. When the cell
is in the barred state, the UE cannot select this cell, but it provides emergency call service in
general cases, unless this cell in the IE of Access class barred list indicates this cell prohibited
emergency call. The UE ignores the IE of Cell Reserved for SoLSA. The UE can select other
cells according to the following rules:
[1] If the IE of Intra-frequency cell re-selection indicator in the Cell Access Restrict
section is ALLOWED, and if the cell reselection condition is met, the UE can select another
intra-frequency cell.
[2] If this UE camps on other cells, it will delete this cell from the neighboring cell set within
the time of Tarred. The parameter of Tarred and the cell state are provided in the system
information of Cell Access Restriction.
[3] If the UE does not select other cells and this cell is still the best serving cell, the UE will
check the state of this cell within the time of Tarred.
[4] If the IE of Intra-frequency cell re-selection indicator in the Cell Access Restrict
section is not allowed, even if the cell reselection condition is met, the UE cannot select the best
serving cell with the same frequency with the barred cell. The emergency call is the exception,
that is, the emergency call service ignores this IE.
[5] If this cell is still the besting service cell, the UE checks the state of this cell within the
Tarred time.
3. Access control. The UEs that camp on this cell will not detect the access level or the
related cell access restriction information. That is, the UE will not discard the cell that it camps on,
as it bars other UEs of all levels from accessing. Therefore, the change of the access restriction
condition will not trigger the cell reselection procedure of the UE. Before transmitting the RRC
CONNECTION REQUEST message to the cell, the UE will detect the access level and the
related cell access restriction information. For the UE starting the initial cell access when it
selects UTRAN for inter-system measurement on other cells (it enters connected mode) and the
UEs in connected mode, the access level and cell restrict condition information will be ignored.
4. Emergency call. Generally, all the cells in the not barred state will provide the emergency
service, in spite of the restriction condition and reserving condition. If necessary, the restriction
on the emergency calls will be indicated in the IE of Access class barred list. For the details of
the IE of Access class barred list, refer to TS 22.201.
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2.1.4.5 SIB5:
PICH-PowerOffset
AICH-PowerOffset
PrimaryCCPCH-Info: tx-DiversityIndicator for FDD
PRACH-SystemInformationList:
SCCPCH-SystemInformationList:
CBS-DRX-Level1Information
Note:
1. The SIB5 contains the configuration information of the common channel, such as
information received by paging. To fast calculate the paging time during cell reselection, it is
helpful to shorten the repetition cycle of SIB5.
2. The paging and SCCPCH in idle mode. If one or more PCHs are set up in a cell, each
SCCPCH bears one PCH, and each PCH has one PICH respectively, more than one PCH and
PICH will be defined in SIB5, and the UE will select one SCCPCH in the IMSI-based list of SIB5
according to this rule: “the selected SCCPCH index”= IMSI mod K, where K is the number of
SCCPCHs for bearing PCH in the cell (that is the number of SCCPCHs for bearing FACH is not
included). The relevant information of SCCPCH is sequenced from 0 to k-1 in the system
information. The index of SCCPCH uniquely identifies the PCH borne by the SCCPCH in this cell
as well as the relevant PICH. When the UE has no IMSI, for emergency call for example, the
IMSI is regarded as 0.
3. SCCPCH selection in connected mode. If the UE enters connected mode from idle
mode by transmitting the RRC CONNECTION REQUEST message, it will select the SCCPCH
bearing FACH in SIB5 based on the Initial UE identity according to the following rules to receive
the RRC CONNECTION SETUP message: “the selected SCCPCH index”= “Initial UE Identity”
mod K. where K is the number of SCCPCHs for bearing FACH in the cell (that is the number of
SCCPCHs for bearing PCH is not included). The relevant information of SCCPCH is sequenced
from 0 to k-1 in the system information. The initial UE identity is obtained by the UE by
transmitting the IE in RRC CONNECTION REQUEST. Refer to Section 8.2 of the 25.304
protocol, and SIB5 in the 25.331 protocol.
4. Discontinuous connection. The UE in idle mode can use the discontinuous receiving
method (DRX) to lower the power consumption. When DRX is used, the UE only needs to
monitor the PI within each DRX period. The length of the paging period is MAX(2K,PBP) frames,
where K is an integer, and PBP is the paging block period. The PBP is only used for TDD, and it
is equal to the receiving period of PICH. For FDD, PBP=1. The CBS-DRX of SIB5 is only for the
discontinuous receiving for CTCH, and this will be realized in V1.3.
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2.1.4.6 SIB7:
UL-Interference: Uplink interference information (-110 to -70)
prach-Information-SIB5-List
prach-Information-SIB6-List, optional
expirationTimeFactor: expirationtimer=MAX ([320ms], SIB_REPexpirationTimeFactor),
indicating update period, with expirationTimeFactor:: 1–8.
Note: SIB7 includes the parameters requiring constant changes transmitted on the RACH
uplink, such as uplink interference, and it is not updated with the value tag of MIB. It must be
read from the BCCH before the usage of these parameters and the transmission in short
repeated cycle.
2.1.4.7 SIB11:
FACH measurement occasion info
Measurement control system information
Note: The size of the SIB11 depends on the number of adjacent cells and the volume of
measurement control information contained. When it is supposed that only one cell exists and
there is other measurement control information, this information block will have no segmentation
in a TTI. When there is 32 adjacent cells (including 12 intra-frequency cells, 12 inter-frequency
cells and 8 GSM cells for example), SIB11 will use 10 TTIs. All these are suitable for SIB12 in
connected mode.
2.1.4.8 SIB18:
Idle mode PLMN identities
Connected mode PLMN identities
2.2 RRC Connection
UE UTRAN
RRC CONNECTION REQUEST
RRC CONNECTION SETUP
RRC CONNECTION SETUP COMPLETE
Figure 6 RRC signalling connection setup process
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To access network service, the UE must set up RRC connection at the AS and UTRAN,
namely the RRC CONN REQ for setting up channel allocated by UTRAN, shown in Figure 6, and
then it uses this AS connection for the signalling exchange with the CN. As UTRAN can decide
the initial connected state, CELL_FACH or CELL_DCH, of the UE requesting to access, that is,
different common transport channels mapped by the DCCH corresponds to different RRC flows.
2.2.1 RRC_CONNECTION_REQUEST
Figure 7 shows IEs of this message.
UE information elements
Initial UE identity: Indicates whether a UE has available TMSI, PTMSI, IMSI and IMEI
information, based on the priority of the UE.
Establishment cause: It refers to the RRC connection setup cause, including: Originating
Conversational Call, Originating Streaming Call, Originating Interactive Call, Originating
Background Call, Originating Subscribed traffic Call, Terminating Conversational Call,
Terminating Streaming Call, Terminating Interactive Call, Terminating Background Call,
Emergency Call, Inter-RAT cell re-selection, Inter-RAT cell change order, Registration,
Detach, Originating High Priority Signalling, Originating Low Priority Signalling, Call
re-establishment, Terminating High Priority Signalling, Terminating Low Priority Signalling,
Terminating - cause unknown.
Protocol error indicator: It is the protocol error indicator, including the options of No error,
ASN.1 violation or encoding error, Message type non-existent or not implemented, Message
not compatible with receiver state, Information element value not comprehended,
Information element missing, Message extension not comprehended.
Measurement information elements
Measured results on RACH: It reports the measured results on RACH of the
intra-frequency cell (monitoring set) designated in SIB11, including the qualities of the
primary scrambling code and pilot Ec/No of the cell.
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Figure 7 RRC CONNECT REQUEST
2.2.2 RRC_CONNECTION_SETUP & RRC_CONNECTION_SETUP_COMPLETE
When the DCCH is mapped to the common channel (RACH/FACH), the RRC connection
(SRB) does not need to set up a radio link. But during the service setup (TRB), as the DTCH is
mapped to the DCH, a radio link is to be set up, and the RRC connection will be re-set up on the
dedicated channel. When the DDCH is mapped to the DCH, the RRC connection (SRB) needs to
set up a radio link. During the service setup, as DTCH also needs to be mapped to the DCH, the
number of DCHs will be increased, which will lead to repeated configuration of radio links. In
these two cases, the RRC connection request messages initiated by the UE are identical. The
following is the description of the IEs in the RRC connection setup messages in these two cases.
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Figure 8, Figure 10, Figure 11 and Figure 13 are two groups of the corresponding flow
messages.
2.2.2.1 UE in the CELL_FACH state after the RRC connection setup
Figure 8 RRC CONNECT SETUP (DCCH is mapped on common channel)
Figure 8 shows the IEs of the RRC CONNECTION SETUP message.
UE Information Elements: When the UE is receiving this message, it will check whether
the ID in this IE is consistent with that of itself. If not so, it will discard this message; if so, it
will read the indication of UE in connected mode from the rrc StateIndication of the UTRAN.
If frequency information is contained, it will select a cell for camping on according to the cell
reselection rule in connected mode. Then it will select PRACH (refer to Section 8.5.17 in the
25.331 protocol) and SCCPCH (refer to Section 8.5.19 in the 25.331 protocol), ignoring the
IE of UTRAN DRX cycle length coefficient, without using DRX. The UE has performed
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common channel synchronization before transmitting RRC CONN REQ, so this step is
omitted there.
RB Information Elements: Figure 8 displays four singling RB IEs. At present, SRB1 is
used to transmit the message in the unacknowledgement mode (RLC UM), such as RRC
CONN REL, URA UPDATE CONFIRM, CELL UPDATE CONFIRM and PHYSICAL
SHARED CHANNEL ALLOCATION (Node: the RRC CONN REQ and RRC CONN SETUP
messages are transmitted on the CCCH borne by SRB0). SRB2 is used to transmit the
message in the acknowledgement mode (RLC AM). At present, most messages (except the
directly transmitted messages of the NAS layer) are transmitted on the DCCH of this bearer.
SRB3 and SRB4 are used to transmit the directly transmitted messages in the RCL AM
mode on the NAS layer. Each SRB contains the parameters of the RLC layer of the QoS
guaranteed in this bearer, as shown in Figure 9.
TrCH Information Elements (ul AddReconfTransChInfoList and dl
AddReconfTransChInfoList): This message content is invalid in Figure 8, as RACH and
FACH have been set up when the cell is created. DCH 6 filled in is only for message
alignment, which will not be adopted but reserved by the UE. This useless DCH will be
deleted from ul/dl DeletedTransChInfoList during RB SETUP.
maxAllowed UL TX Power: It is the maximum transmit power of the UE, and is set to
24dBm, as shown in the figure.
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Figure 9 MappingInfo of SRB1 and SRB2 of the DCCH mapped to the common channel
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Figure 10 RRC CONNECT SETUP COMPLETE (DCCH is mapped on the common channel
Figure 10 shows the IEs of RRC CONNECTION SETUP COMPLETE message:
UE Information Elements: It contains values of STARTCS or STARTPS for triggering the
encryption and integrality protection.
Other information elements: It contains the radio access capability information of the UE,
including PDCP capability (indicating whether the PDCP supports lossless transition), RLC
capability (sizes of all RCL AM BUFFERs and the maximum RLC window), transport
channel capability (including maximum transmission and receiving Bit, conversion bit, TB,
TF, TFC, and so on), radio frequency capability (including transmit capability of the UE and
the uplink/downlink frequency interval), physical channel capability (such as maximum
transmit Bit), inter-system access capability, encryption and integrality protection algorithm
supporting capability, measurement capability (for example, whether the uplink/downlink
supports compressed mode measurement. Huawei’s UE supports downlink compressed
mode measurement only).
2.2.2.2 UE in CELL_DCH state after RRC connection setup
Figure 11 shows the IEs of the RRC CONNECTION SETUP message:
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Figure 11 RRC CONNECT SETUP (DCCH is mapped to the dedicated channel
UE Information Elements: When the UE is receiving this message, it will check whether
the ID in this IE is consistent with that of itself. If not so, it will discard this message; if so, it
will read the indication of UE in connected mode from the rrc StateIndication of the UTRAN.
If the UE is in the CELL_DCH state, it will enter the synchronization procedure introduced in
the 25.214 protocol. Because when the UE receives this message, NodeB has created the
downlink radio link, so the two stages of downlink synchronization specified in Section
4.3.1.2 of the 25.214 protocol: Stage 1, the physical layer does not report the Out of sync
message within 160ms after the DCH is set up initially, but it will judge the in-sync state with
this criterion: the physical layer estimates the quality of the downlink DPCCH of the former
40ms, if this quality is always better than the threshold of Qin, it will report the In sync
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message to the high layer. However, before the 40-ms DPCCH quality measurement is
completed, this criterion cannot be realized. Stage 2, 160ms after the DCH is set up, the
physical layer will report the Out of sync and In sync messages according to the actual
detection result. Refer to the protocol for the criterion for judging Out of sync. The
out-of-sync timer (T313/N313) of downlink radio link and the in-sync timer (T315), refer to
the description of SIB1 in the previous part. After the downlink synchronization and the UE
transmits pc preamble (the number of frames in ul DPCH Info) frames on the UL DPCCH
channel, the UL DPDCH starts data transmission. The signalling on SRB is transmitted on
the UL DPDCH only after SRB Delay (the number of frames specified in ul DPCH Info)
frames. The uplink is judged by NODE-B, requiring the detection of the synchronization
mode of all the radio link sets of the uplink in each radio frame. Each radio link set has only
one synchronization mode. In NODEB, each radio link set will be tranfered to one of the
following three states: initial state, out-of-sync state and in-sync state. The protocol does not
specify the judging criteria directly, it just recommends to judge based on the DPCCH quality
estimation or CRC check. For the realization mode, refer to the downlink judging mode
mentioned above.
RB Information Elements: Refer to 2.2.2.1 for details. The difference from 2.2.2.1 is the
logical channel in RB MappingInfo is mapped to DCH.
TrCH Information Elements (ul CommonTransChInfo, ul AddReconfTransChInfoList, dl
CommonTransChInfo, dl AddReconfTransChInfoList): including the information of TFC, TF
and dl DCH Bler.
PhyCH information elements (frequencyInfo): Uplink/downlink frequency information,
for the UE in connected mode to perform cell reselection in the intra-frequency cell.
maxAllowed UL TX Power: The maximum transmit power of the UE, it is 19dBm as shown
in the figure.
Uplink radio resources (ul DPCH Info): It contains the pc preamble, SRB delay and the
uplink power control algorithm, the power offset of the UL DPCCH, scrambling code, spread
factor, TFCI and punching limit used for UL DPCCH synchronization.
Downlink radio resources (dl CommonInfomation and dl Information PerRl List): It
contains the power control mode of the DL DPCH, TFCI, DTX insertion method
(positionFixedorFlexible, it is Fixed at present, which is used for downlink compressed mode
with the punching method), primary scrambling code and channelization code.
Figure 13 shows the IEs of the RRC CONNECTION SETUP COMPLETE message. Refer to
Section 2.2.2.1 for details.
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Figure 12 MapingInfo of SRB1 and SRB2 of the DCCH mapped to the DCH
Figure 13 RRC CONNECT SETUP COMPLETE (DCCH is mapped to the DCH)
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3 Access Procedure Performance Analysis
3.1 Performance Indices of Access Procedure
For network planning, the performance indices for evaluating the access procedure are the
access success rate and connection delay. These two indices directly reflect the access
performance of the RAN (access network) and UE (mobile phone). They are related to the
coverage and capacity of the network. The access success rate refers to success rate of the
active access caused by call initiating of the NAS layer of the UE or the passive access caused
by paging receiving. Connection delay refers to the time from access to service connection setup.
However, the statistics points of these two indices are in the core network (CN), which cannot
reflect the access state well in the network optimization. In this document the access
performance index of the RAN (that is the RRC connection setup success rate, namely the times
of successful setup of RRC connection) are evaluated from the statistics points of the AS. This
index can be obtained with the OMC statistics tool by referring to Section 2.1.6 in Reference [3].
For the detailed traffic statistics, refer to Reference [7]. This consideration is for network
coverage in the pre-planning and network optimization phases, and measuring the cell pilot
signals through UE of drive test equipment, observing whether the UE performs cell searching,
selection, reselection, initiates random access, attaching, location registration/updating, and
accepts the services of the network normally, so as to perform site adjustment (distance between
sites, azimuth, downtilt and so on).
In addition to the success rate of the RRC connection setup, the cell searching and selection
time, the random access rate, the transmit power of the UE can act as the performance indices
for evaluating network coverage. But the main problem is these indices do not have precise
statistics values.
The speed of random access depends on the initial synchronization time (including code
synchronization and frame synchronization in the random access channel). The number of
random access channels depends on the expected access load. All these will affect the
information transmitted in the random access procedure. Moreover, if the UE uses an over-large
transmit power, it will lower the system capacity. Therefore, it is very essential to lower the
transmit power of the UE in the random access procedure, which cannot be controlled by the fast
closed loop power control in the random access procedure. It seems inconsistent that high
transmit power lead to fast synchronization, but cause interference to other users, while lower
transmit power lead to slow synchronization, kept in the finite repetition times, which drives up
the transmit power step by step. Therefore, the accurate open loop power control can have the
UE use a proper initial transmit power, which will be greatly helpful to the performance of random
access.
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3.2 Relevant Factors Affecting Access Procedure Performance
3.2.1 Incorrect Setting of Tcell Affecting Cell Searching Speed
Tcell is used to define the transmit start time and the BFN relative delay of the downlink
scrambling codes of the SCH and CPICH of a cell. Its main purpose is to avoid overlap of the
secondary synchronization channels (SSCH) between different cells in the same NodeB. If this
cannot be avoided, it will affect the frame synchronization and scrambling code group
identification during cell searching. The resolution of the cell Tcell is 256 chips, the value range of
Tcell is 0–9256 chips. Please ensure the Tcells of intra-frequency Neighboring cell are
inconsistent. Refer to Reference [4]
3.2.2 Unreasonable Neighboring cell List Affecting Cell Selection
The RRC CONNECTION REQUEST message contains the pilot measurement information
of this cell and the Neighboring cell attached by the UE. These pilot measurements are
performed during cell selection of the UE. If there are many Neighboring cells of the primary cell
in the system information broadcast, the UE needs to take a long time to measure the qualities of
the pilot signals of all the neighboring cells. Thus the user access speed will be lowered. So an
important task for network optimization is to reasonably plan the neighboring cell list of each
primary cell defined in the planning phase, and delete some useless neighboring cells with the
traffic statistics tool in a specific pre-commercial application. For example, two cells are
neighbours to each other, with handover area. But they does not have or have little inter-cell
handover due to the geographic obstructions such as river. Therefore, these two cells should not
be neighboring cells. These factors cannot be considered in the pre-planning phase due to the
factors of map and dimensioning. So this must be optimized.
3.2.3 Doppler Frequency Shift Affecting Access Performance of UE
The frequency shift of BS and UE are related to the radio instruments directly. The
frequency shift of the BS is 0.05PPM (uncertain). The precision of radio instruments have been
considered in the design, which have been defined before delivery, and must be changed if it is
too poor.
For UMTS, the Doppler frequency shift is represented as slow shading of the channel, which
will affect the access of the UE in the mobile process. As the performance decrease when the
UE is traveling at the speed below 20km/h can be compensated by the power control of the
system, and the deep shading when the UE is traveling at the speed above 60km/h can be
remedied by means of interleaving. This is represented by the requirement on Eb/No (Refer to
Chapter 15 in Reference [5]). The performance degradation includes access performance
degradation of the UE. For this slow shading, the performance of the UE can be kept in high
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quality by means of network planning. (As the network planning software does not support
dynamic simulation, it is described as a problem here.)
Please note that, the signings such as RRC (borne by SBR) has higher requirement on the
Eb/No than data (borne by TRB). The access procedure is mainly for signalling exchange, so it
requires BLER be 0%. That is, once an error occurs, the signalling must be retransmitted (whose
QoS are guaranteed by RLC).
3.2.4 Traffic Distribution in Cell Effect on Acquisition Probability
We can view from the message contents listed above that the system realized presently has
not considered the division of the ASC like emergency call service. But in the actual
commercialization process, it is necessary to specify the corresponding ASC strategies to ensure
the number of specific user group like emergency call user group. Especially for the case of high
user density, it is likely to encounter access difficulty (For the scenarios like squares. It may have
few people generally, but may have parties in some specific occasion, during which the access
may be difficult due to large numbers of users. For example, the popularization of short message
brings unexpected pressure to the RAN directly. For the RAN itself, the short message service,
call service and Internet access service are the same, even though short message is a non
real-time service, but it may bring pressure to the services requiring high call success rate, such
as call service and Internet access service. But this will not be represented on traffic model).
These difficulties suffer random access, that is, the user acquisition rate is lowered by collision.
This influence is represented by the random access parameter, namely the maximum
retransmission times of the random access preamble. If the maximum retransmission times is
exceeded, it may cause access failure. This parameter directly maps the collision of the system
on the random access.
The UE may estimate the UL Interference incorrectly due to environment change or different
distance to the BS, because the users at the cell border and those at the cell center use the
same UL Interference (namely the RSSI of NodeB, which is received by the UE in SIB7. This
value is updated once every 1s, and broadcast once every 100ms repeatedly on the BCH. Note
that 1s is the period timer realized by the program, which cannot be modified. The RNC can set
the time interval for repeated broadcast. When the coverage range of the cell is large, this
inaccuracy will affect the initial transmit power of the random access preamble. In addition, it will
affect the parameter of Ramp step between preambles will be affected as a specific acquisition
rate should be guaranteed. Considering large traffic of short message service, the ramp step (2
dB at present) will influence the uplink capacity and the access acquisition rate (This influence
degree needs to be estimated by the whole system simulation. Huawei has not studied to the
depth for the moment).
3.2.5 Different Clutters Affecting Open Loop Power Control
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During network planning, different clutters will be covered. Refer to Reference [6]. Different
clutters may lead to different path losses, and this will directly influence the open loop power
control of the initial transmission power of the random access channel preamble. The parameter
representing the compensation to the uplink/downlink path loss is Constant Value (-25dB at
present). The formula for calculating the initial transmission power is as follows:
Preamble_Initial_Power = Primary CPICH TX power – CPICH_RSCP + UL interference +
Constant Value
According to the recent analysis, -25dB is a small value for Constant Value, which should
be set to -20dB or larger, so that the access threshold value can be larger. The value of Pp_m
can be set to a small value, so as to keep the coverage, UL interference at an optimal level.
However, in the actual environment, even though the UE estimates the open loop power
accurately, the actual effect of signal transmitted after the estimation of open loop power arriving
NodeB varies due to different distances between the UE and the BS and different clutter
scenarios. For example, In NodeB, the Ec/No of the static channel and that of the case3 channel
are -21.5, but the acquisition probability in the static channel is about 90%, and that in the case3
channel is less than 70%. Therefore, to improve the random access performance, it is necessary
to consider the influence of the propagation environment on the open loop power control, but
also consider increasing the acquisition probability.
4 Analysis Procedure for Access Procedure
Access procedure analysis can be performed after network pre-planning and cell planning
and development, so as to provide reference for cell planning optimization and network
performance optimization. The following are the analysis steps:
4.1 Step 1: Knowing System Performance
It is mainly to know the operation mode of the network (that is, whether Gs interface exists
between MSC and SGSN). The relevant algorithms of RNC (such as access, call permission,
uplink outer loop power control, load control, etc.) and the algorithm switch setting, as well as the
basic configuration parameters of NodeB, and basic configuration parameters of UE.
4.2 Step 2: Ensuring a Stable System
It is to ensure stable UTRAN and CN, that is to ensure the equipment of RNC and NodeB
run normally, and the transmission between them are stable, and ensure the equipment of MSC,
SGSN, GGSN, HLR and VLR are stable with correct subscriber registration information.
4.3 Step 3: Determining Neighboring cell Distribution
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It is to provide PLMN, SA, RA, URA and Neighboring cell list of each primary cell for the
initial network construction according to the network pre-planning and cell planning result.
4.4 Step 4: Executing Pilot Auditing
Pilot auditing is mainly to perform pilot coverage test on the inter-frequency and
intra-frequency cells and the Neighboring cells with E7476, for evaluating the similarities and
differences between the test result and simulation result, and searching for interference source.
For the measurement method for interference source, refer to the frequency scanning test
document (YBT250).
4.5 Step 5: Updating Neighboring cell List
1. In the pre-planning and cell planning stages, the system may be configured with many
Neighboring cells, so it is necessary to optimize the Neighboring cell list according to the
measurement result of the UE.
2. Then count the Neighboring cells that have not been defined according to the traffic
statistics tool.
4.6 Step 6: Drive Test
It is mainly to use an UE to perform cell searching test, cell selection and reselection, and
random access test.
4.7 Step 7: Drive test Result Analysis
4.7.1 Analysis Method
For analysis method for drive test result, refer to Reference [8] and the upcoming drive test
analysis document. The analysis method for the random access part is described as follows:
a. Random access failure, Indicator: The transmission power of the UE has not reached the
maximum value.
Cause 1: The specified ASC restricts the access
Cause 2: The preamble retransmission times has reached the maximum value
Cause 3: The estimated primary transmission power is not suitable
Cause 4: The network side parameters of Constant value, Ramp step and Pp-m are not
suitable
b. Random access failure, Indicator: The transmission power of the UE has reached the
maximum value.
Cause 1: Access channel collision
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Cause 2: NodeB does not detect access information
4.7.2 Parameters to be Analyzed and Adjusted in the Access Procedure
Refer to the RNC B02D006 version, as shown in Table 6.
5 Analysis of Problems in Access Procedure
5.1 UE Failing in Cell Search
1. Confirm whether the downlink channel number is set correctly, with the downlink channel
number = downlink frequency 5
2. Confirm whether the NodeB cell is set up successfully, in the case of instrument is
available, observe the code domain power of P-CPICH, P-SCH and S-SCH of NodeB. Evaluate
whether the pilot coverage and common channel ratio are appropriate.
3. Observe the values of RSCP and RSSI received by the UE from the background, which
displays the minimum size of RSSI is –101dBm, and that of RSCP is –106dBm. Increasing the
Tx Power of NodeB if necessary.
4. Check whether the band of UE DB is set correctly.
5.2 UE Failing in Cell Access or Receiving RRC Connection
Rejection
1. Check the call permission restriction or ASC access level restriction
2. Check the RNC System abnormity
3. Check the problems of HLR IMSI subscriber registration.
Note: For the operator, there are two methods for realizing the restriction on access cell: one
is by indicating the state of the cell (reserved for the operator for the control reason); the other is
by barring access of the users within a certain AC range by means of call permission control. For
the users, they are rejected due to system overload in this case. But the users at the specific AC
level can access the network. The AC levels are stored in the USIM.
5.3 RNC Failing in Receiving the RRC_CONNECTION_REQ
Message Transmitted by UE
1. Observe the state of RACH Preamble transmission and AI receiving, to get the preamble
transmission times and last transmission power, and get the AI information received by the UE: 0
for success, 1 for failure and 2 for rejection.
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2. Observe from NodeB whether the TFCI value and CRC in the RACH Message are
abnormal, so as to confirm whether message is received incorrectly.
The above two problems may be caused by poor quality of the radio link. The UE can
access the network with a higher power control (for example 16dBm) with the power control
disabled.
3. The last PLMN location registration fails, and is barred. The UE detects the same PLMN
but does not initiate RRC CONN REQ, as this PLMN has been put into FORBIDEN PLMN LIST.
Therefore the UE will not search for another one. Refer to 23.122 3.1.
5.4 UE Failing in Receiving the RRC_CONNECTION_SETUP
Message Transmitted by RNC
1. Input tbfach at the UE super terminal to observe the data receiving status of the FACH
transport channel (with tbfach 1 reset). If there are too many error packets among the total
packets received (or no data packet is received), it indicates the link quality is poor, or the
transmit power of the FACH configured by the RNC is low. In addition, observe the RSSI of the
UE to judge whether this failure is caused by weak signals.
2. Confirm whether the timer window appears.
3. At present, the RRC connection is set up on the DCH. (If the signalling connection switch
is turned on, it will be set up on the FACH.) During the location or test with UE, you can enable
the DCH BLER statistics to see from the background statistics file whether the transport block is
received, and whether it is correct. For the signalling set up on the FACH, you can observe them
with the FACH observing method mentioned in 1.
5.5 UE Failing in Receiving ACK Message Indicating RRC
Connection Completion
1. This is mainly because the uplink cannot receive the
RRC_CONNECTION_SETUP_COMPLETE message. You can confirm it through the Trace of
RNC, or observe whether NodeB reports Restore. If NodeB does not report Restore, it indicates
the uplink is not synchronized successfully, which may be caused by incorrect open loop power
control. You can disable the power control at the UE, so that the UE transmit with a large
transmit power (for example 16dBm).
2. If the repeated reset access fails, and fails after changing an UE, check whether the RLC
parameters are appropriate and modify them (for example increasing the retransmission times).
Table 6 Parameters to be analyzed and adjusted in the access procedure
RNC MML Para Paramet Parameter description
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Command met
er
ID
er name
MOD
RNCBASIC
(Modifying
PLMN)
RncId RNC ID
Value range: 0~4095
Physical unit: None
Meaning: It is the unique identifier of an RNC. Recommended value: None
Mcc Mobile country code
Value range: 0~999
Physical unit: None
Meaning: Mobile country code of RNC
Recommended value: None
Mnc Mobile network code
Value range: 0~999 or 0~99
Physical unit: None
Meaning: Mobile network code of RNC
Recommended value: None
MOD
CNDOMAIN
(Modifying
period timer
and network
running mode)
CNDomainId
CN domain ID
Value range: CS_DOMAIN(CS domain), PS_DOMAIN (PS domain)
Physical unit: None
Meaning: It specifies the CN type
Recommended value: None
T3212 Cell updating period
Value range: 0~255
Physical unit: 6min
Meaning: This parameter indicates the timer length for periodical update. Periodical update is implemented by the MS through location update. The value of 0 indicates period update is not adopted. Only when the CN domain ID is CS_DOMAIN will this parameter be valid.
Recommended value: 1
ATT Attach/detach allowance indication
Value range: NOT_ALLOWED, ALLOWED
Physical unit: None
Meaning: This parameter indicates whether to allow attach or detach, NOT_ALLOWED indicates MS cannot apply IMSI attach and detach procedure, ALLOWED indicates the MS can apply the IMSI attach and detach procedure. This parameter is valid only when CN domain ID is set to CS_DOMAIN.
Recommended value: ALLOWED
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NMO Network maintenance mode
Value range: MODE1, MODE2
Physical unit: None
Meaning: This parameter indicates the operation network mode. It is to be set according to the actual configurations of the network. It is to be set to MODE1 if Gs interface exists between SGSN and MSC/VLR, and it is to be set to MODE2 if Gs interface does not exist between SGSN and MSC/VLR.
Recommended value: None
DRX Cycle Length Coef
Discontinuous cycle length coefficient
Value range: 6~9
Physical unit: None
Meaning: This parameter is used by the UE to calculate the length of the DRX cycle length of the CN domain. Recommended value: 8
SET
IDLEMODETIM
ER
(Set the timer in
idle mode) T300 Timer T300
Value range: D100, D200, D400, D600, D800, D1000, D1200, D1400, D1600, D1800, D2000, D3000, D4000, D6000, D8000
Physical value range: 100, 200, 400, 600, 800, 1000, 1200, 1400, 1600, 1800, 2000, 3000, 4000, 6000, 8000
Physical unit: ms
Meaning: The UE starts the timer T300 after transmitting the RRC CONNECTION REQUEST message, and this timer after receiving the RRC CONNECTION SETUP message. Once the timer expires, and if V300=<N300, the UE will retransmit RRC CONNECTION REQUEST; otherwise, it will enter idle mode. The default value is 1000.
Recommended value: D3000
N300 Constant 300
Value range: 0~7
Physical unit: None
Meaning: This parameter indicates the maximum times of retransmission of the RRC CONNECTION REQUEST message, with 3 by default.
Recommended value: 3
T312 Timer T312
Value range: 1~15
Physical unit: s
Meaning: The UE starts the timer T312 when it starts to set up DCH, and stops this timer when it detects N312 continuous synchronization indications from L1. Once the timer expires, it indicates physical channel setup failure. The default value is 1.
Recommended value: 1
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N312 Constant 312
Value range: D1, D50, D100, D200, D400, D600, D800, D1000
Physical value range: 1, 50, 100, 200, 400, 600, 800, 1000
Physical unit: None
Meaning: This parameter indicates the maximum times of continuous synchronization indication from L1. The default value is 1. Recommended value: D1
SET
IDLEMODETIM
ER
(Setting the
timer in
connected
mode)
T301 Timer T301
Value range: D100, D200, D400, D600, D800, D1000, D1200, D1400, D1600, D1800, D2000, D3000, D4000, D6000, D8000
Physical value range: 100, 200, 400, 600, 800, 1000, 1200, 1400, 1600, 1800, 2000, 3000, 4000, 6000, 8000
Physical unit: ms
Meaning: This timer is invalid in the R99 protocol. It is a reserved timer. The default value is 2000.
Recommended value: None
N301 Constant 301
Value range: 0~7
Physical unit: None
Meaning: The default value is 2.
Recommended value: None
T302 Timer T302
Value range: D100, D200, D400, D600, D800, D1000, D1200, D1400, D1600, D1800, D2000, D3000, D4000, D6000, D8000
Physical value range: 100, 200, 400, 600, 800, 1000, 1200, 1400, 1600, 1800, 2000, 3000, 4000, 6000, 8000
Physical unit: ms
Meaning: The UE starts the timer T302 after transmitting the CELL UPDATE/URA UPDATE message, and stops this timer after receiving the CELL UPDATE CONFIRM/URA UPDATE CONFIRM message. Once the timer expires, and if V302<=N302, the UE will retransmits CELL UPDATE/URA UPDATE; otherwise, it enters idle mode. The default value is 40000.
Recommended value: D2000
N302 Constant 302
Value range: 0~7
Physical unit: None
Meaning: It refers to the maximum times of retransmission of the CELL UPDATE/URA UPDATE message. The default value is 3.
Recommended value: 3
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T304 Timer T304
Value range: D100, D200, D400, D1000, D2000
Physical value range: 100, 200, 400, 1000, 2000
Physical unit: ms
Meaning: The UE starts the timer T304 after transmitting the UE CAPABILIRY INFORMATION message, and stops after the receiving the UE CAPABILITY INFORMATION CONFIRM message. Once the timer expires, and if V304<=N304, the UE will retransmits UE CAPABILIRY INFORMATION; otherwise, it will initialize the cell updating procedure. The default value is 2000.
Recommended value: D2000
N304 Constant 304
Value range: 0~7
Physical unit: None
Meaning: It refers to the maximum times of retransmission of the UE CAPABILIRY INFORMATION message. The default value is 2.
Recommended value: 3
T305 Timer T305
Value range: INFINITY, D5, D10, D30, D60, D120, D360, D720
Physical value range: infinity, 5, 10, 30, 60, 120, 360, 720
Physical unit: min
Meaning: The UE starts the timer T305 after entering the CELL_FACH, URA_PCH or CELL_PCH state and transmitting the CELL UPDATE CONFIRM/URA UPDATE CONFIRM message. The UE stops this timer after entering other state. Once the timer expires, if the timer T307 is not initiated and the UE detects it is in the service area, the UE will transmit CELL UPDATE. Otherwise, if the timer T307 is not initiated, it will be initiated. The value of Infinity indicates no update The default value is 30.
Recommended value: D10
T307 Timer T307
Value range: D5, D10, D15, D20, D30, D40, D50
Physical value range: 5, 10, 15, 20, 30, 40, 50
Physical unit: s
Meaning: The UE starts the timer T307 when the timer T305 expires and the UE detects it is out of the service area, and stops this timer when the UE detects it enters the severing area again. Once the timer expires, the UE enters idle mode. The default value is 30.
Recommended value: None
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T308 Timer T308
Value range: D40, D80, D160, D320
Physical value range: 40, 80, 160, 320
Physical unit: ms
Meaning: The UE starts the timer T308 after the transmitting the RRC CONNECTION RELEASE COMPLETE message. Once the timer expires, and if V308<=N308, the UE transmits the RRC CONNECTION RELEASE COMPLETE message; otherwise, it enters idle mode. The default value is 160.
Recommended value: D160
N308 ConstantN308
Value range: 1~7
Physical unit: None
Meaning: It refers to the maximum times of retransmission of the RRC CONNECTION RELEASE COMPLETE message.
Recommended value: 1
T309 Timer T309
Value range: 1~8
Physical unit: s
Meaning: The UE starts the timer T309 after selecting a cell belonging to other radio access system in the connection mode or after receiving the CELL CHANGE ORDER FROM UTRAN message. The UE stops this timer after setting up connection in a new cell successfully. Once the timer expires, the UE will keep connecting with the UTRAN. The default value is 5.
Recommended value: 1
T310 Timer T310
Value range: D40, D80, D120, D160, D200, D240, D280, D320
Physical value range: 40, 80, 120, 160, 200, 240, 280, 320
Physical unit: ms
Meaning: The UE starts timer T310 after transmitting the PUSCH CAPACITY REQUEST message, and stops after the UE receives the PHYSICAL SHARED CHANNEL ALLOCATION message. Once the timer expires, and if V310<=N310, the UE will transmit the PUSCH CAPACITY REQUEST message; otherwise, this procedure will be ended. The default value is 160.
Recommended value: None
N310 Constant 310
Value range: 0~7
Physical unit: None
Meaning: It refers to the maximum timers of retransmission of the PUSCH CAPACITY REQUEST message. The default value is 4.
Recommended value: None
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T311 Timer T311
Value range: D250, D500, D750, D1000, D1250, D1500, D1750, D2000
Physical value range: 250, 500, 750, 1000, 1250, 1500, 1750, 2000
Physical unit: ms
Meaning: The UE starts the timer T311 after receiving the PHYSICAL SHARED CHANNEL ALLOCATION message, and the item of PUSCH allocation is set to PUSCH allocation pending. The UE stops this timer after receiving the PHYSICAL SHARED CHANNEL ALLOCATION message, and the item of PUSCH allocation is set to PUSCH allocation assignment. Once the timer expires, the UE re-initiates the PUSCH capability request procedure. The default value is 2000.
Recommended value: None
T312 Timer T312
Value range: 0~15
Physical unit: s
Meaning: The timer T312 is initiated after the UE starts setting up the DCH, and it is stopped after the UE detects N312 continuous in-sync indications on L1. Once the timer expires, it indicates physical channel setup failure. The default value is 1.
Recommended value: 1
N312 Constant 312
Value range: D1, D50, D100, D200, D400, D600, D800, D1000)
Physical value range: 1, 50, 100, 200, 400, 600, 800, 1000
Physical unit: None
Meaning: It refers to the maximum number of continuous in-sync indications received from L1. The default value is 1.
Recommended value: D1
T313 Timer T313
Value range: 0~15
Physical unit: s
Meaning: The UE starts the timer T313 after detecting N313 continuous out-of-sync indications on L1, and stops this timer after detecting N315 continuous in-sync indications on L1. Once the timer expires, it indicates physical channel setup failure. The default value is 3.
Recommended value: 3
N313 Constant 313
Value range: D1, D2, D4, D10, D20, D50, D100, D200
Physical value range: 1, 2, 4, 10, 20, 50, 100, 200
Physical unit: None
Meaning: It refers to the maximum number of continuous out-of-sync indications received from L1. The default value is 20.
Recommended value: D50
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T314 Timer T314
Value range: D0, D2, D4, D6, D8, D12, D16, D20
Physical value range: 0, 2, 4, 6, 8, 12, 16, 20
Physical unit: s
Meaning: The UE starts the timer T314 when the radio link failure judging criteria are met and the radio bearer associated with the timer T314 exists, and stops this timer after the cell updating procedure is completed. The default value is 12.
The UE starts the timer T314 (or T315) and the CELL UPDATE signalling is transmitted when the user in the CELL_DCH state encounters radio link connection failure. Before the timer T314 (or T315) expires, if the radio link reconfiguration by the CELL UPDATE CONFIRM message is not successful, the CELL UPDATE signalling can be retransmitted to perform reconfiguration (related to T302 and N302) of the radio link, so as to offer a chance for radio link reconfiguration. For this, set
T314 to a value greater than T302N302. After T314 expires, the service RB corresponding to the timer will be deleted.
Recommended value: D0
T315 Timer T315
Value range: D0, D10, D30, D60, D180, D600, D1200, D1800
Physical value range: 0, 10, 30, 60, 180, 600, 1200, 1800
Physical unit: s
Meaning: The UE starts the timer T315 when the radio link failure judging criteria are met and the radio bearer associated with the timer T315 exists, and stops this timer after the cell updating procedure is completed. The default value is 180.
The UE starts the timer T315 (or T314) and the CELL UPDATE signalling is transmitted when the user in the CELL_DCH state encounters radio link connection failure. Before the timer T315 (or T314) expires, if the radio link reconfiguration by the CELL UPDATE CONFIRM message is not successful, the CELL UPDATE signalling can be retransmitted to perform reconfiguration (related to T302 and N302) of the radio link, so as to offer a chance for radio link reconfiguration. For this, set
T314 to a value greater than T302N302. After T315 expires, the service RB corresponding to the timer will be deleted.
Recommended value: D0
N315 Constant 315
Value range: D1, D50, D100, D200, D400, D600, D800, D1000
Physical value range: 1, 50, 100, 200, 400, 600, 800, 1000
Physical unit: s
Meaning: It refers to the maximum number of in-sync indications from L1 during the timing period of the timer T313. The default value is 1.
Recommended value: D1
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T316 Timer T316
Value range: D0, D10, D20, D30, D40, D50, INFINITY
Physical value range: 0, 10, 20, 30, 40, 50, infinity
Physical unit: s
Meaning: The UE starts the timer T316 when it is in the URA_PCH or CELL_PCH state and detects it is out of the service area. The UE stops this timer after it enters the service area again. Once T316 expires, the UE will initiates the cell updating procedure when it detects it is in the service area; otherwise, the UE starts the timer T317. After the UE detects it enters the service area, its state is transited to CELL_FACH, and it will initiates the cell updating procedure. The default value is 30.
Recommended value: D30
T317 Timer T317
Value range: D0, D10, D30, D60, D180, D600, D1200, D1800
Physical value range: 0, 10, 30, 60, 180, 600, 1200, 1800
Physical unit: s
Meaning: The UE starts the timer T317 when T316 expires or the UE in the CELL_FACH detects it is out of service area. The UE stops this timer after it enters the service area again. Once T317 expires, the UE state is transited to idle. The default value is 180. Recommended value: D30
MOD
CELLFACHMR
OCCA
(Modifying the
cell FACH
measurement
occasion
information)
CellID Cell ID
Value range: 0~268435455
Physical unit: None
Meaning: It is the unique identifier of a cell.
Recommended value: None
InterFreqFDD MeasInd
Inter-frequency FDD measurement indication
Value range: REQUIRE , NOT_REQUIRE
Physical unit: None
Meaning: It indicates whether this cell requires inter-frequency cell reselection. REQUIRE indicates it require, in this case the parameter of FACH measurement occasion cycle length coefficient is valid for the inter-frequency measurement; NOT_REQUIRE indicates it does not require, in this case the parameter of FACH measurement occasion cycle length coefficient is invalid for the inter-frequency measurement.
Recommended value: None
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FACHMeasOccaCLC
FACH measurement occasion cycle length coefficient
Value range: 1~12
Physical unit: None
Meaning: It indicates the time when the UE in the CELL_FACH state can enter the inter-frequency measurement. The parameter value range is (1-5). The bigger the value, the timer spent for inter-frequency cell measurement will be longer. When the inter-frequency FDD measurement indication is REQUIRE or the inter-frequency system measurement indication is REQUIRE TRUE, this parameter must be mandatory.
Recommended value: 4
InterRATMeasInd
Inter-frequency system measurement indication
Value range: REQUIRE, NOT_REQUIRE
Physical unit: None
Meaning: It indicates whether this cell requires inter-frequency cell reselection. REQUIRE indicates it requires, in this case the parameter of FACH measurement occasion cycle length coefficient is valid for the inter-frequency measurement; NOT_REQUIRE indicates it does not require, in this case the parameter of FACH measurement occasion cycle length coefficient is invalid for the inter-frequency measurement.
Recommended value: None
MOD CELL
(Modifying the
basic
information data
of the cell,
including
[maximum
transmit power
of cell], [radio
connection
failure time],
[number of
continuous
in-sync
indications],
[number of
out-of-sync
indications] ) as
well as the
CellID Cell ID
Value range: 0~268435455
Physical unit: None
Meaning: It is the unique identifier of a cell.
Recommended value: None
MaxTxPower
Maximum transmit power of the cell
Value range: 0~500
Physical value range: 0~50, with the step length of 0.1
Physical unit: dBm
Meaning: It specifies the sum of the maximum transmit power of all the downlink channels in the cell at the same time. It is set according to the network planning.
Recommended value: 430
NInsyncInd
Number of continuous in-sync indications
Value range: 1~256
Physical unit: None
Meaning: It specifies the number of continuous in-sync indications to be received in the radio link recovery process triggered by NodeB. The radio link set keeps in the initial state until it receives NInsyncInd continuous in-sync indication from L1. In this case, After the radio link recovery process triggered by NodeB indicates radio link set are synchronized, once the radio link recovery process is triggered, the radio link set will be taken as in the in-sync state.
Recommended value: 5
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transmit power
of the downlink
common
channels
(primary
synchronization
channel,
secondary
synchronization
channel,
primary
common pilot
physical
channel and
broadcast
channel) in the
cell.
NOutsyncInd
Number of continuous out-of-sync indications
Value range: 1~256
Physical unit: None
Meaning: It specifies the number of continuous out-of-sync indications received for starting the Timer TRlFailure. When the radio link set is in the in-sync state, NodeB needs to start the timer TRlFailure after it receives NOutsyncInd continuous out-of-sync indications. The NodeB needs to stop and reset this timer after it receives NInsyncInd continuous in-sync indications. If the timer TRlFailure expires, NodeB will trigger the radio link failure procedure, and indicates the radio link set out-of-sync.
Recommended value: 5
TRlFailure Duration of radio link failure timer
Value range: 0~255
Physical value range: 0~25.5, with the step length of 0.1
Physical unit: s
Meaning: It specifies the length of the timer TRlFailure. When the radio link set is in the in-sync state, NodeB needs to start the timer TRlFailure after it receives NOutsyncInd continuous out-of-sync indications. And NodeB should stop and reset this timer after it receives NInsyncInd continuous in-sync indications. If the timer TRlFailure expires, NodeB will trigger the radio link failure procedure and indicates the radio link set out-of-sync.
Recommended value: 200
PschPower
PSCH transmit power
Value range: -350~150
Physical value range: -35~15, with the step length of 0.1
Physical unit: dB
Meaning: This parameter indicates the power offset from the transmit power of the primary common pilot channel (PCPICH) in
the cell. PSCH transmit power = [PschPower]0.1 + PCPICH transmit power.
Recommended value: -50
SschPower
SSCH transmit power
Value range: -350~150
Physical value range: -35~15, with the step length of 0.1
Physical unit: dB
Meaning: This parameter indicates the power offset from the transmit power of the primary common pilot channel (PCPICH) in
the cell. SSCH transmit power = [SschPower] 0.1+PCPICH transmit power
Recommended value: -50
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PcpichPower
PCPICH transmit power
Value range: -100~500
Physical value range: -10~50, with the step length of 0.1
Physical unit: dBm
Meaning: This parameter defines the power offset from the transmit power of the PCPICH in the cell. This parameter needs to be set based on the actual system environment, for example, cell coverage range (radius) and geographic environment.
Recommended value: 330
BchPower BCH transmit power
Value range: -350~150 Physical value range: -35~15, with the step length of 0.1 Physical unit: dB Meaning: It specifies the power offset of the transmit power of the PCPICH in the corresponding cell. BCH transmit power = [BchPower] × 0.1 + PCPICH transmit power. Recommended value: -20
MOD
CELLSETUP
(This command
can modify the
basic
information of a
cell, such as
cell name,
uplink
frequency,
downlink
frequency, node
synchronization
switch and
primary
downlink
scrambling
code, as
required.)
CellID Cell ID
Value range: 0 ~268435455
Physical unit: None
Meaning: It is the unique identifier of a cell.
Recommended value: None
CellName Cell name
Value range: 250 characters
Physical unit: None
Meaning: It is the unique name of a cell
Recommended value: None
UARFCNUplink
Uplink frequency
Value range: 0~16383
Physical value range: 0.0~3276.6
Physical unit: MHz
Meaning: It specifies the uplink frequency of the cell.
Recommended value: None
UARFCNDownlink
Downlink frequency
Value range: 0~16383
Physical value range: 0.0~3276.6
Physical unit: MHz
Meaning: It specifies the downlink frequency of the cell.
Recommended value: None
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TCell Time deviation
Value range: CHIP0, CHIP256, CHIP512, CHIP768, CHIP1024, CHIP1280, CHIP1536, CHIP1792, CHIP2048, CHIP2304
Physical value range: 0, 256, 512, 768, 1024, 1280, 1536, 1792, 2048, 2304
Physical unit: chip
Meaning: This value is used to define the time deviation from BFN, synchronization channel (SCH) in the cell, common pilot channel (CPICH) and downlink scrambling code
Recommended value: None
DlTpcPattern01Count
Downlink power control mode 1
Value range: 0~30
Physical unit: None
Meaning: It determines the DL TPC mode before the uplink synchronization of the first radio link set is completed.
Recommended value: 10
PowerRaiseLimit
Power raise limit
Value range: 0~10
Physical unit: dB
Meaning: This parameter indicates the raise limit of downlink transmit power within a specific period (defined by DlPowerAverageWindowSize).
Recommended value: 10
DlPowerAverageWindowSize
Downlink power average window size
Value range: 1~60
Physical unit: slot
Meaning: UTRAN calculates the raise of downlink transmit power within the period defined by this parameter to check whether the power raise limit is exceeded. If the limit is exceeded, the power will not be adjusted even the power raise command is received.
Recommended value: 20
NodeSynSwitch
Node synchronization switch
Value range: ON, OFF
Physical unit: None
Meaning: It indicates whether to transmit the node synchronization message to NodeB in the cell creation procedure.
Recommended value: None
PScrambCode
Primary downlink scrambling code
Value range: 0~511
Physical unit: None
Meaning: It specifies the primary scrambling code sequence in the cell.
Recommended value: None
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SupSSDT SSDT support indication
Value range: TRUE, FALSE
Physical unit: None
Meaning: It specifies whether to support location selection diversity (SSDT).
Recommended value: FALSE
STTDInd STTD
indication of cell
Value range: TRUE, FALSE
Physical unit: None
Meaning: It specifies whether to support space time transmit diversity (SSDT).
Recommended value: None
TxDiversityMode
Transmit diversity mode
Value range: NONE, STTD, CLOSED_LOOP_MODE1, CLOSED_LOOP_MODE2
Physical unit: None
Meaning: It indicates whether to configure STTD open loop transmit diversity or closed loop transmit diversity, or not to configure transmit diversity. If closed loop transmit diversity is to be configured, it is necessary to select the mode to be used.
Recommended value: None
TxDiversityInd
Transmit diversity indication
Value range: TRUE, FALSE
Physical unit: None
Meaning: It indicates whether to activate transmit diversity configuration.
Recommended value: None
LoCell Local cell ID
Value range: 0~268435455
Physical unit: None
Meaning: Local cell ID, corresponding to the logical cell one by one. It represents the resource of NodeB.
Recommended value: None
ClosedLoopTimeAdjustMode
Closed loop time adjusting mode
Value range: OFFSET1, OFFSET2
Physical unit: None
Meaning: It indicates the time when the phase/amplitude adjustment is to be executed when the closed loop transmit diversity is performed on the DPCH. Recommended value: None
MOD
CELLSETUP
(Modifying other
CellID Cell ID
Value range: 0~268435455
Physical unit: None
Meaning: The unique identifier of a cell.
Recommended value: None
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information of a
cell, incuding
service
indication
(ServiceInd),
location area
code (LAC),
route area code
(RAC), service
area code
(SAC)).
ServiceInd CN domain indication
Value range: SUPPORT_CS, SUPPORT_PS, SUPPORT_CS_AND_PS
Physical value range: 0,1,2
Physical unit: None
Meaning: It specifies the CN domain service this cell can support.
Recommended value: SUPPORT_CS_AND_PS
LAC Location area domain code
Value range: 0x0000~0xFFFF (Except 0x0000 and 0xFFFE
Physical unit: None
Meaning: It specifies a location area for the PLMN of the GSM-MAP type. It is defined by the operator.
Recommended value: None
RAC Routing area code
Value range: 0x00~0xFF
Physical unit: None
Meaning: It specifies a routing area code within a location area code. It is defined by the operator.
Recommended value: None
SAC Service area code
Value range: 0x0000~0xFFFF
Physical unit: None
Meaning: It constitutes service area ID (SAI) together with PLMN-Id and LAC. The service area ID is used to define an area composed of one or more cells belonging to one location area. This area is called as service area, used for indicating the location of the UE for the CN. SAC is defined by the operator. Recommended value: None
MOD
PCPICHPWR
(Modifying the
power
information of
the primary
common pilot
channel
(PCPICH) in the
cell.)
CellID Cell ID
Value range: 0~268435455
Physical unit: None
Meaning: It is the unique identifier of a cell.
Recommended value: None
MaxPCPICHPower
Maximum PCPICH transmit power
Value range: -100~500
Physical value range: -10~50, with the step length of 0.1
Physical unit: dBm
Meaning: It specifies the maximum transmit power of the PCPICH in the cell. It should be set based on the actual system environment, such as cell coverage range (radius) and geographic environment. It is affected by the total power of the cell. When the maximum transmit power of the PCPICH is too large, the cell capacity will be decreased. Increasing the power of the pilot channel under the condition of ensuring a certain soft handover area proportion will not help to improve the performance of downlink coverage.
Recommended value: None
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MinPCPICHPower
Minimum PCPICH transmit power
Value range: -100~500
Physical value range: -10~50, with the step length of 0.1
Physical unit: dBm
Meaning: It indicates the minimum transmit power of the PCPICH in the cell. It should be set based on the actual system environment, such as cell coverage range (radius) and geographic environment. When the maximum transmit power of the PCPICH is too small, the cell capacity will be affected. This parameter should be set under the condition of ensuring a certain soft handover area proportion or ensuring no coverage void. Recommended value: None
MOD
CELLACCESS
STRICT
(Modifying the
cell access
restriction
configuration
information,
including cell
state and cell
reservation
information as
well as access
control
information)
Where, by setting the access control information, the operator can prevent access channel overload in the critical condition. The SIM/USIMs of all UEs have been assigned to one of access classes 0 to 9. In addition, the SIM/USIM storage information of the UEs
CellID Cell ID
Value range: 0~268435455
Physical unit: None
Meaning: It is the unique identifier of a cell.
Recommended value: None
CellReservedforoperatoruse
Indication of cell reserved for operator use
Value range: RESERVED, NOT_RESERVED
Physical unit: None
Meaning: It indicates whether the cell is reserved for the operator. If the current cell is in the NOT_BARRED (access allowed) state, and its indication is RESERVED for operator use, the UEs assigned toes 11 and 15 in the local PLMN can select or reselect this cell; while the UEs assigned toes of 0 to 9 and 12 and 14 cannot.
Recommended value: NOT_RESERVED
CellReservationExtension
Indication of cell reservation extension
Value range: RESERVED, NOT_RESERVED Physical unit: None Meaning: It indicates whether this cell is reserved for expansion. If current cell is in the NOT_BARRED (allowed to access) state, and its indication is NOT_RESERVED for operator use but RESERVED for expansion, the UEs will be barred from this cell. Recommended value: NOT_RESERVED
IsAccessClass0Barred –IsAccessClass15Barred
Indication of barring Access classes 0–15
Value range: BARRED, NOT_BARRED Physical unit: None Meaning: It indicates whether the UE assigned to 0 is allowed to initiate access. The UE judges whether it belongs to this class from SIM/USIM. Recommended value: NOT_BARRED (allowed to access)
CellBarred Indication of cell barred
Value range: BARRED, NOT_BARRED
Physical unit: None
Meaning: When the cell is in the BARRED state, it indicates it cannot be selected or reselected by the UE, even if for the emergency call service. This parameter is in the switch type.
Recommended value: NOT_BARRED (allowed to access)
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may be assigned with one or more special access classes (access classes 11 to 15). The UEs of these classes are the special uses with high quality, as described below:
Access class 15 —— PLMN Staff
IntraFreqReselectionId
Intra-frequency cell reselection indication
Value range: ALLOWED, NOT_ALLOWED
Physical unit: None
Meaning: This parameter is valid when the CellBarred is set to BARRED. When the cell state is barred, if this parameter is set to ALLOWED, the UE can select another intra-frequency cell when the cell selection/reselection condition is met; if this parameter is set to NOT_ALLOWED, the UE cannot reselect another intra-frequency cell. For emergency call, this indication can be ignored.
Recommended value: None
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Access class 14 —— Emergency Services
Access class 13 —— Public Utilities
Access class 12 —— Security Services
Access class 11 —— For PLMN Use
Different from
access classes
0 to 9 and
access classes
11 to 15, the
control
information of
access class 10
is notified to the
UE through air
interface
signals, for
indicating
whether the
UEs belonging
to access
classes 0 to 9
or the UEs
without IMSI
can access the
network when
they needs the
emergency call
service.
Tarred Barred time
Value range: D10, D20, D40, D80, D160, D320, D640, D1280
Physical value range: 10, 20, 40, 80, 160, 320, 640, 1280
Physical unit: s
Meaning: This parameter is valid when the CellBarred is set to BARRED. It indicates the delay to the next time of measurement on this cell when this cell is barred. The barred time can be adjusted properly according to the actual unavailable time of the cell in the network planning.
Recommended value: None
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MOD
CELLSELRESE
L
(Modifying cell
selection and
reselection
information)
CellID Cell ID
Value range: 0~268435455
Physical unit: None
Meaning: It is the unique identifier of a cell.
Recommended value: None
Qhyst1s Measurement hysteresis 1
Value range: 0~20
Physical value range: 0~40, with the step length of 2.
Physical unit: dBm
Meaning: This specifies the hysteresis value (Qhyst). It is used for in case the quality measure for cell selection and re-selection is set to CPICH RSCP. The value is related to the slow shading characteristics of the area where the cell is located. The bigger the slow shading variance, the bigger this value will be.
Recommended value: 2
Qhyst2s Measurement hysteresis 2
Value range: 0~20
Physical value range: 0~40, with the step length of 2
Physical unit: dB
Meaning: This specifies the hysteresis value (Qhyst). It is used if the quality measure for cell selection and re-selection is set to CPICH Ec/No. The value is related to the slow shading characteristics of the area where the cell is located. The bigger the slow shading variance, the bigger this value will be.
Recommended value: 1
Treselections
Reselection delay time
Value range: 0~31
Physical unit: s
Meaning: If the signal qualities of other cells (CPICH Ec/No measured by the UE) keep better than the current cells camped on within the time specified by this parameter, the UE will update the cell to be camped on. This parameter is used to avoid Pingpong reselection between cells. The value of 0 corresponds to the default value specified in the protocol, but does not indicate 0s.
Recommended value: 0
Qqualmin Minimum quality standard
Value range: -24~0
Physical unit: dB
Meaning: It corresponds to the minimum access threshold of CPICH Ec/No. Only when the UE detects a CPICH Ec/No greater than this threshold can the UE camp on this cell.
Recommended value: -18
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Qrxlevmin Minimum receiving level
Value range: -58~ -13
Physical value range: -115~-25, with the step length of2(-58: -115; -57:-113; ..., -13:25)
Physical unit: dBm
Meaning: It corresponds to the minimum access threshold of CPICH RSCP. Only when the UE detects a CPICH RSCP greater than this threshold can the UE camp on this cell.
Recommended value: -58
MaxAllowedUlTxPower
Maximum allowed uplink transmit power of the UE
Value range: -50~33
Physical unit: dBm
Meaning: It is the maximum transmit power that the UE is allowed to use in this cell. Its value is related to network planning.
Recommended value: None
Sintrasearch
Intra-frequency cell reselection starting threshold
Value range: -16~10
Physical value range: -32~20, with the step length of 2
Physical unit: dB
Meaning: It is the threshold of starting intra-frequency cell reselection. When the UE detects the CPICH Ec/No value of the current service area is lower that this threshold plus the minimum quality standard of this service cell (that is the parameter of Qqualmin), it will start the cell reselection procedure. This parameter is optional.
Recommended value: 3
Sintersearch
Inter-frequency cell reselection starting threshold
Value range: -16~10
Physical value range: -32~20, with the step length of 2
Physical unit: dB
Meaning: It is the threshold for starting the Inter-frequency cell reselection procedure. When the UE detects the CPICH Ec/No value of the current service area is lower that this threshold plus the minimum quality standard of this service cell (that is the parameter of Qqualmin), it will start the cell reselection procedure. This parameter is optional.
Recommended value: 2
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Ssearchrat
Inter-system cell reselection starting threshold
Value range: -16~10
Physical value range: -32~20, with the step length of 2
Physical unit: dB
Meaning: It is the threshold for starting the Inter-system cell reselection procedure. When the UE detects the CPICH Ec/No value of the current service area is lower that this threshold plus the minimum quality standard of this service cell (that is the parameter of Qqualmin), it will start the cell reselection procedure. This parameter is optional.
Recommended value: 2
SintrasearchInd
Indication of configuring intra-frequency cell reselection starting threshold
Value range: TRUE (Configure the intra-frequency cell reselection starting threshold, FALSE(Not configure the intra-frequency cell reselection starting threshold
Physical unit: None
Meaning: It indicates whether to set the intra-frequency cell reselection starting threshold.
Recommended value: None
SintersearchInd
Indication of configuring inter-frequency cell reselection starting threshold
Value range: TRUE (Configure the inter-frequency cell reselection starting threshold, FALSE (Not configure the inter-frequency cell reselection starting threshold)
Physical unit: None
Meaning: It indicates whether to configure the inter-frequency cell reselection starting threshold. TRUE means to configure the inter-frequency cell reselection starting threshold, and FALSE means not to configure it.
Recommended value: None
SsearchratInd
Indication of configuring inter-system cell reselection starting threshold
Value range: TRUE (Configure the inter-system cell reselection starting threshold), FALSE (Not configure the inter-system cell reselection starting threshold)
Physical unit: None
Meaning: It indicates whether to configure the inter-system cell reselection starting threshold. TRUE means to configure the inter-system cell reselection starting threshold, and FALSE means not to configure it. Recommended value: None
MOD SCCPCH
(Modifying the
SCCPCH
CellID Cell ID
Value range: 0~268435455
Physical unit: None
Meaning: It is the unique identifier of a cell.
Recommended value: None
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configuration
information,
including the
information of
the FACH and
PCH
parameters)
PhyChId SCCPCH ID
Value range: 0~255
Physical unit: None
Meaning: It uniquely identifies the secondary common control physical channel in a cell
Recommended value: None
PCHToAWS
Start point of PCH time window
Value range: 0~1279
Physical unit: ms
Meaning: This parameter defines the start point for the downlink data frame reaching the time window. In normal cases, it is estimated that the downlink data frame should reach the window after this time. TOAWS is defined as the positive value corresponding to TOAWE, which indicates the size of the receiving time window.
Recommended value: None
PCHToAWE
End point of PCH time window
Value range: 0~2559
Physical unit: ms
Meaning: This parameter defines the end point for the downlink data frame reaching the time window. In normal cases, it is estimated that the downlink data frame should reach the window before this time. TOAWS is defined as the positive value corresponding to the latest time of arrival (LTOA), which indicates the location of the receiving time window.
Recommended value: None
PCHPower PCH power
Value range: -350~150
Physical value range: -35~15, with the step length of 0.1
Physical unit: dB
Meaning: This parameter indicates the power offset from the transmit power of the primary common pilot channel (PCPICH) in the cell.
Recommended value: None
FACHNum Modified number of FACHs
Value range: D0, D1, D2
Physical value range: 0~2
Physical unit: None
Meaning: It indicates the number of forward accessing channel to be modified
Recommended value: None
FACH1Id FACH1 ID
Value range: 0~255
Physical unit: None
Meaning: This parameter is the unique identifier of a common transport channel in a cell.
Recommended value: None
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FACH1ToAWS
Start point of FACH1 time window
Value range: 0~1279
Physical unit: ms
Meaning: This parameter defines the start point for the downlink data frame reaching the time window. In normal cases, it is estimated that the downlink data frame should reach the window after this time. TOAWS is defined as the positive value corresponding to TOAWE, which indicates the size of the receiving time window.
Recommended value: None
FACH1ToAWE
End point of FACH1 time window
Value range: 0~2559
Physical unit: ms
Meaning: This parameter defines the end point for the downlink data frame reaching the time window. In normal cases, it is estimated that the downlink data frame should reach the window before this time. TOAWS is defined as the positive value corresponding to the latest time of arrival (LTOA), which indicates the location of the receiving time window.
Recommended value: None
FACH1MaxPower
Maixmum transmit power of FACH1
Value range: -350~150
Physical value range: -35~15, with the step length of 0.1
Physical unit: dB
Meaning: This parameter indicates the power offset from the transmit power of the primary common pilot channel (PCPICH) in the cell.
Recommended value: None
FACH2Id FACH2 ID
Value range: 0~255
Physical unit: None
Meaning: This parameter is the unique identifier of a common transport channel in a cell.
Recommended value: None
FACH2ToAWS
Start point of FACH2 time window
Value range: 0~1279
Physical unit: ms
Meaning: This parameter defines the start point for the downlink data frame reaching the time window. In normal cases, it is estimated that the downlink data frame should reach the window after this time. TOAWS is defined as the positive value corresponding to TOAWE, which indicates the size of the receiving time window.
Recommended value: None
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FACH2ToAWE
End point of FACH2 time window
Value range: 0~2559
Physical unit: ms
Meaning: This parameter defines the end point for the downlink data frame reaching the time window. In normal cases, it is estimated that the downlink data frame should reach the window before this time. TOAWS is defined as the positive value corresponding to the latest time of arrival (LTOA), which indicates the location of the receiving time window.
Recommended value: None
FACH2MaxPower
Maixmum transmit power of FACH2
Value range: -350~150
Physical value range: -35~15, with the step length of 0.1
Physical unit: dB
Meaning: This parameter indicates the power offset from the transmit power of the primary common pilot channel (PCPICH) in the cell. Recommended value: None
MOD PRACH
(Reconfiguring
PRACH and the
corresponding
AICH basic
configuration
information)
CellID Cell ID
Value range: 250 characters
Physical unit: None
Meaning: It is the unique identifier of a cell.
Recommended value: None
PhyChId PRACH ID
Value range: 0~255
Physical unit: None
Meaning: This parameter is the unique identifier of a physical random access channel in a cell.
Recommended value: None
AvailableSF
PRACH spread factor
Value range: D32, D64, D128, D256
Physical value range: 32, 64, 128, 256
Physical unit: None
Meaning: This parameter describes the minimum available spread factor of PRACH.
Recommended value: 32
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Constantvalue
Constant value of initial transmit power
Value range: -35~-10
Physical unit: dB
Meaning: This parameter is used to calculate transmit power of the first access preamble in the random access procedure, with the following calculation formula:
Preamble_Initial_Power = Primary CPICH DL TX power - CPICH_RSCP + UL interference + Constant Value Where, Preamble_Initial_Power is the initial transmit power, and Primary CPICH DL TX power is the transmit power of the primary common pilot channel, and CPICH_RSCP is the receiving signal code power of the primary common pilot channel measured by UE, and UL interference is the uplink interference.
Recommended value: -23
PowerRampStep
Power ramp step
Value range: 1~8
Physical unit: dB
Meaning: This parameter indicates the power ramp step for transmitting the random access preamble before the UE receives the AI in the random access procedure.
Recommended value: 2
PreambleRetransMax
Maximum number of preamble retransmissions
Value range: 1~64
Physical unit: None
Meaning: This parameter indicates the maximum number of preambles transmitted in a preamble ramping cycle. Recommended value: 20
MOD
PRACHUUPAR
AS
(Modifying
random access
control
parameter in
the system
information of
the designated
PRACH)
CellID Cell ID
Value range: 250 characters
Physical unit: None
Meaning: It is the unique identifier of a cell.
Recommended value: None
PhyChId PRACH ID
Value range: 0~255
Physical unit: None
Meaning: This parameter is the unique identifier of a physical random access channel in a cell.
Recommended value: None
AvailableSF
PRACH spread factor
Value range: D32, D64, D128, D256
Physical value range: 32, 64, 128, 256
Physical unit: None
Meaning: This parameter describes the minimum available spread factor of PRACH.
Recommended value: 32
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Constantvalue
Constant value of initial transmit power
Value range: -35~-10
Physical unit: dB
Meaning: This parameter is used to calculate transmit power of the first access preamble in the random access procedure, with the following calculation formula:
Preamble_Initial_Power = Primary CPICH DL TX power - CPICH_RSCP + UL interference + Constant Value. Where, Preamble_Initial_Power is the initial transmit power, and Primary CPICH DL TX power is the transmit power of the primary common pilot channel, and CPICH_RSCP is the receiving signal code power of the primary common pilot channel measured by UE, and UL interference is the uplink interference.
Recommended value: -23
PowerRampStep
Power ramp step
Value range: 1~8
Physical unit: dB
Meaning: This parameter indicates the power ramp step for transmitting the random access preamble before the UE receives the AI in the random access procedure.
Recommended value: 2
PreambleRetransMax
Maximum number of preamble retransmissions
Value range: 1~64
Physical unit: None
Meaning: This parameter indicates the maximum number of preambles transmitted in a preamble ramping cycle. Recommended value: 20
MOD
PRACHASC
(Modifying the
available
access
resource
corresponding
to the access
service class of
the designated
PRACH,
including
available
CellID Cell ID
Value range: 250 characters
Physical unit: None
Meaning: It is the unique identifier of a cell.
Recommended value: None
PhyChId PRACH ID
Value range: 0~255
Physical unit: None
Meaning: This parameter is the unique identifier of a physical random access channel in a cell.
Recommended value: None
AccessServiceClass
Access service class
Value range: ASC0, ASC1, ASC2, ASC3, ASC4, ASC5, ASC6, ASC7
Physical unit: None
Meaning: This parameter identifies an access service class.
Recommended value: None
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signature start
index, available
signature end
index and
available
subchannel
number)
AvailablesignatureStartIndex
Available signature start index
Value range: 0~15
Physical unit: None
Meaning: This parameter identifies an available signature start index of an access service class.
Recommended value: 0
AvailablesignatureEndIndex
Available signature end index
Value range: 0~15
Physical unit: None
Meaning: This parameter identifies an available signature end index of an access service class.
Recommended value: 7
AvailableSubchannelNumber
Available subchannel number
Value range: 0~15
Physical unit: None
Meaning: This parameter indicates the number of available subchannels in an access service class. When the UE selects the access subchannel, if AICH_Transmission_Timing=1, repeat AvailableSubchannelNumber for 3 times, constituting a Bitstring (12), and then perform And operation with the Bitstring (12) corresponding to the available subchannel number of this PRACH to get 12 bits of data streams. When one of these 12 bits is 1, it indicates the corresponding subchannel is available to this ASC. If AICH_Transmission_Timing=0, repeat the last three bits of AvailableSubchannelNumber for four times, constituting the Bitstring (12), and then perform And operation with the Bitstring (12) corresponding to the available subchannel number of this PRACH to get 12 bits of data streams. When one of these 12 bits is 1, it indicates the corresponding subchannel is available to this ASC.
Recommended value: 15
PersistScalingFactor
Persist scaling factor
Value range: Enum{D0.9, D0.8, D0.7, D0.6, D0.5, D0.4, D0.3, D0.2}
Physical value range: 0.9, 0.8, 0.7, 0.6, 0.5, 0.4, 0.3, 0.2
Physical unit: None
Meaning: This parameter is used for ASC2-ASC7 to calculate the corresponding dynamic persist value. It is mandatory for ASC2-ASC7 only.
Recommended value: None
MOD
PRACHACTOA
SCMAP CellID Cell ID
Value range: 250 characters
Physical unit: None
Meaning: It is the unique identifier of a cell.
Recommended value: None
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(Modifying the
AC-ASC
mapping
information of
the PARCH)
PhyChId PRACH ID
Value range: 0~255
Physical unit: None
Meaning: This parameter is the unique identifier of a physical random access channel in a cell.
Recommended value: None
Ac09ToAsc
Access classes 0 to 9 mapping to access service class
Value range: 0~7
Physical unit: None
Meaning: This parameter indicates the mapping relation between the users of access classes 0 to 9 and the access service class.
Recommended value: None
Ac10ToAsc
Access class 10 mapping to access service class
Value range: 0~7
Physical unit: None
Meaning: This parameter indicates the mapping relation between the users of access class 10 and the access service class.
Recommended value: None
Ac11ToAsc
Access class 11 mapping to access service class
Value range: 0~7
Physical unit: None
Meaning: This parameter indicates the mapping relation between the users of access class 11 and the access service class.
Recommended value: None
Ac12ToAsc
Access class 12 mapping to access service class
Value range: 0~7
Physical unit: None
Meaning: This parameter indicates the mapping relation between the users of access class 12 and the access service class.
Recommended value: None
Ac13ToAsc
Access class 13 mapping to access service class
Value range: 0~7
Physical unit: None
Meaning: This parameter indicates the mapping relation between the users of access class 13 and the access service class.
Recommended value: None
Ac14ToAsc
Access class 14 mapping to access service class
Value range: 0~7
Physical unit: None
Meaning: This parameter indicates the mapping relation between the users of access class 14 and the access service class.
Recommended value: None
Ac15ToAsc
Access class 15 mapping to access service class
Value range: 0~7 Physical unit: None Meaning: This parameter indicates the mapping relation between the users of access class 15 and the access service class. Recommended value: None
WCDMA RNO Access Procedure Analysis Guidance For internal use only
10-4-30 All rights reserved Page 77 , Total 81
MOD
INTRAFREQCE
LL
(Modifying the
information
intra-frequency
Neighboring
cells)
CellID Cell ID
Value range: 0~268435455
Physical unit: None
Meaning: It is the unique identifier of a cell.
Recommended value: None
NCellID Neighboring cell ID
Value range: 0~268435455
Physical unit: None
Meaning: It is the unique identifier of an intra-frequency Neighboring cell.
Recommended value: None
ReadSFNInd
Indicating whether to read SFN or not
Value range: NOT_READ, READ
Physical unit: None
Meaning: It indicates whether to read the SFN of the target cell.
Recommended value: READ
CellIndividalOffset
Cell individal offset
Value range: -20~20
Physical value range: -10~10, with the step length of 0.5
Physical unit: dB
Meaning: It is the CPICH measurement value offset of the cell. This value plus the actual measurement value is used for the event evaluation procedure of the UE. It acts as the border of the mobile cell in the handover algorithms. It is set in the network planning according to the actual environment.
Recommended value: 0
CellsForbidden1A
Affecting 1A threshold or not
Value range: NOT_AFFECT, AFFECT
Physical unit: None
Meaning: It indicates this cell will affect the relative threshold of the event 1A or not.
Recommended value: NOT_AFFECT
CellsForbidden1B
Affecting 1B threshold or not
Value range: NOT_AFFECT, AFFECT
Physical unit: None
Meaning: It indicates this cell will affect the relative threshold of the event 1B or not.
Recommended value: NOT_AFFECT
Qoffset2sn
Cell offset of central cell load level from the adjacent cell load level
Value range: -50~50
Physical unit: dB
Meaning: It is the cell offset used for the CPICH Ec/No measurement value in the cell selection and reselection. It acts as the border of Mobile cell. The bigger this value, the probability of selecting adjacent cell will be smaller, and vice versa.
Recommended value: 0
WCDMA RNO Access Procedure Analysis Guidance For internal use only
10-4-30 All rights reserved Page 78 , Total 81
Qoffset1sn
Cell offset of central cell load level from the adjacent cell load level
Value range: -50~50
Physical unit: dBm
Meaning: It is the cell offset used for the CPICH RSCP measurement value in the cell selection and reselection. It acts as the border of Mobile cell. The bigger this value, the probability of selecting adjacent cell will be smaller, and vice versa. Recommended value: 0
MOD
INTERFREQCE
LL
(Modifying the
inter-frequency
Neighboring
cells)
CellID Cell ID
Value range: 0~268435455
Physical unit: None
Meaning: It is the unique identifier of a cell.
Recommended value: None
NCellID Neighboring cell ID
Value range: 0~268435455
Physical unit: None
Meaning: It is the unique identifier of an inter-frequency Neighboring cell.
Recommended value: None
ReadSFNInd
Indicating whether to read SFN or not
Value range: NOT_READ, READ
Physical unit: None
Meaning: It indicates whether to read the SFN of the target cell.
Recommended value: READ
CellIndividalOffset
Cell individal offset
Value range: -20~20
Physical value range: -10~10, with the step length of 0.5
Physical unit: dB
Meaning: It is the CPICH measurement value offset of the cell. This value plus the actual measurement value is used for the event evaluation procedure of the UE. It acts as the border of the mobile cell in the handover algorithms. It is set in the network planning according to the actual environment.
Recommended value: 0
Qoffset2sn
Cell offset of central cell load level from the adjacent cell load level
Value range: -50~50
Physical unit: dB
Meaning: It is the cell offset used for the CPICH Ec/No measurement value in the cell selection and reselection. It acts as the border of Mobile cell. The bigger this value, the probability of selecting adjacent cell will be smaller, and vice versa.
Recommended value: 0
WCDMA RNO Access Procedure Analysis Guidance For internal use only
10-4-30 All rights reserved Page 79 , Total 81
Qoffset1sn
Cell offset of central cell load level from the adjacent cell load level
Value range: -50~50
Physical unit: dBm
Meaning: It is the cell offset used for the CPICH RSCP measurement value in the cell selection and reselection. It acts as the border of Mobile cell. The bigger this value, the probability of selecting adjacent cell will be smaller, and vice versa.
Recommended value: 0
MOD CELLLCS
(Modifying the
LCS parameter
for cell
planning, which
is worked out
by the network
planning
engineer by
means of
reconnaissance
)
CellID Cell ID
Value range: 0~268435455
Physical unit: None
Meaning: It is the unique identifier of a cell.
Recommended value: None
LatitudeSign
Latitude sign of cell
Value range: NORTH_LATITUDE, SOUTH_LATITUDE
Physical value range: NORTH_LATITUDE, SOUTH_LATITUDE
Unit: None
Meaning: It is the latitude sign.
Recommended value: None
LatitudeDegree
Latitude degree of cell
Value range: 0~90000000
Physical value range: 0~90, with the step length of 0.000001
Physical unit: Degree
Meaning: It is the latitude degree.
Recommended value: None
LongitudeDegree
Longitude degree of cell
Value range: -180000000~180000000
Physical value range:-180~180, with the step length of 0.000001
Physical unit: Degree
Meaning: It is the longitude degree.
Recommended value: None
CellRadius Cell coverage radius
Value range: 1~10000
Physical value range: 0.01~100, with the step length of 0.01
Physical unit: km
Meaning: It indicates the cell coverage radius.
Recommended value: None
CellStartAngle
CellS start angle
Value range: 0~3600
Physical value range: 0~360, with the step length of 0.1
Physical unit: Degree
Meaning: It is the start angle of the cell.
Recommended value: None
WCDMA RNO Access Procedure Analysis Guidance For internal use only
10-4-30 All rights reserved Page 80 , Total 81
CellCoverAngle
Cell cover angle
Value range: 0~3600
Physical value range: 0~360, with the step length of 0.1
Unit: Degree
Meaning: It is the cover angle of the cell.
Recommended value: None
OmniSign Omnidirectional cell/directional cell indication
Value range: DIRECTIONAL_CELL, OMNIDIRECTIONAL_CELL Physical value range: directional cell, omnidirectional cell Physical unit: None Meaning: It indicates the cell type Recommended value: None
WCDMA RNO Access Procedure Analysis Guidance For internal use only
10-4-30 All rights reserved Page 81 , Total 81
List of references:
[1] QUALCOMM, CDMA System Performance Analysis, 2001/10
[2] 3GPP R1999 25_series, 2002/09
[3] HUAWEI, TELLIN Mobile IN Principle and System Technical Manual, 2003/04
[4] Gu Jufeng WCDMA RNP Technology Research on Special Topics —— Research for T_cell
Parameter Setting Between BSs, 2002/10
[5] Bernard Sklar, Digital Communications —— Fandamentals and Applications (Sencond
Edition), 2002/09
[6] Miao Jiashu and Chen Yan, WCDMA RNP Solutions —— Analysis of Typical Application
Scenarios in RAN Coverage Solution, 2002/10
[7] Dong Yan, WCDMA RNP Technology Research on Special Topics —— Traffic Statistics
Index Analysis, 2002/10
[8] Xi Zhibin, Wang Dekai, and so on, XXX––HUAWEI WCDMA XX Radio Network Optimization
Report at Second Stage of WCDMA XX Pilot, 2003/4