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Transcript of 2 OMF010001 System Information ISSUE1.6
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HUAWEI TECHNOLOGIES CO., LTD.
All rights reserved
www.huawei.com
Internal
System Information
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Chapter 1Chapt
er 1 System Information OverviewSy
stem Information Overview
Chapter 2Chapter 2 Parameters IntroductionParameters Introduction
Chapter 3Chapter 3 Case StudyCase Study
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System Information Overview
System information (SYS INFO) contains network parameters sent
to MS through Um interface
network identity parameters (CGI, CID)
cell selection parameterssystem control parameters
network function parameters
System information can be sent through two kinds of logical
channelsSystem information on BCCH (IN the IDLE mode)
System information on SACCH (Dedicated mode)
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SYS INFO 1
SYS INFO 1
It contains random access control information (RACH) and cell
frequency allocation table (i.e. CA table). It is transmitted on BCCH.
Content
SYS INFO 1
Cell Channel Description
(cell channel description format)
RACH Control Parameter
(random access channel control parameter)
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SYS INFO 1 - Control Parameter
These control parameters include:
Maximum re-transmitting times (MAX retrans)
Extended transmission timeslots (Tx_integer)
Common access control level (AC)
Call reestablish permitted (RE)
Emergency call permitted (EC)
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SYS INFO 2
SYS INFO 2
It contains access control information (RACH), network color code
permitted (NCC Permitted), and neighbor cell frequency allocation list
(BA1 list). It is transmitted on BCCH. Generally speaking, SYS INFO 2,
2BIS, 2TER contains different parts of the neighbor cells BCCH
frequencies. Via reading and decoding BA1 list, MS can perform cellreselection in idle mode. For a MS of GSM900 PHASE I, it only reads the
neighbor cell BCCH frequencies defined in SYS INFO 2, and ignores
those carried by 2BIS and 2TER.
Content
SYS INFO 2
Neighbor Cell BCCH Frequency Description
NCC Permitted
RACH Control Parameter
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SYS INFO 2BIS
SYS INFO 2BIS
2BIS contains RACH control data and neighbor cells BCCH
frequencies (part of BA1 list). It is optional and transmitted on BCCH.
As the number of frequencies in BA1 list carried by SYS INFO 2 is
limited, SYS INFO 2BIS carries the rest of the BCCH frequencies in
the BA1 list that are from the same band as in SYS INFO 2.
Content
SYS INFO 2BIS
Neighbor Cell Description.
RACH Control Parameter (Same as those in SYS INFO 1)
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SYS INFO 2TER
SYS INFO 2TER
2TER contains neighbor BCCH frequencies (part of BA1
list). It is transmitted on BCCH. Only dual band MS can
read this information, and single band 900 or 1800 MS will
ignore it. Since this information carries BCCH frequencies
that belong to different band other than those in SYS INFO
2, it is unnecessary for single band MS to read.
Content
SYS INFO 2TER
Neighbor Cell Description (extended)
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SYS INFO 3
SYS INFO 3
It contains LAI, cell identity, RACH control parameters and
cell selection related parameters. It is transmitted on
BCCH. It is one of the most important information.
Content
SYS INFO 3
Cell Identity
LAI (location area identity)
Control Channel Description
Cell Option
Cell Selection Parameter
RACH Control Parameter
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Cell Identity and Location Area Identity
Cell Global Identity (CGI) consists of Location Area Identity
(LAI) and Cell Identity (CI). And LAI includes Mobile Country
Code (MCC), Mobile Network Code (MNC), and Location Area
Code (LAC). SYS INFO 3, 6, and 4 contain all or part of theinformation of CGI. According to the received SYS INFO, MS
decodes the CGI, and decide whether it can register in the
network based on the MCC and MNC indicated by CGI. At the
same time, it can judge whether the current location area is
changed, so as to decide whether it is necessary to start thelocation updating process.
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Control Channel Description
Control channel description includes the following parameters
IMSI Attach-Detach Allowed (ATT)
Common Control Channel Configuration (CCCH_CONF)
Access Granted Blocks Reserved (BS_AG_BLKS_RES)
Paging Channel Multi-frames (BS_PA_MFRAMES)
Periodic Location Update Timer (T3212)
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Cell Option
Cell option contains the following parameters:
Power control indication (PWRC)
Discontinuous transmission (DTX)
Radio link timeout
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Cell Selection Parameter
Cell selection parameters indicate how the MS should behave
after the MS is powered on. It includes the following
parameters:
Cell Reselection Hysteresis (CRH)
Maximum power level of control channel
(MS_TXPWR_MAX_CCH)
Minimum receiving level of MS permitted to access
(RXLEV_ACCESS_MIN)
Additional reselection parameter indicator (ACS)
Half-rate supported (Support Half-Rate)
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SYS INFO 4
It consists LAI, RACH control parameters, cell selectionparameters and optional CBCH channel information. It istransmitted on BCCH. When the cell supports cell broadcastfunction, CBCH together with CBCH MA describe the
configuration of CBCH the relevant frequency information. Content
SYS INFO 4
LAI
Cell Selection Parameter
RACH Control Parameter
CBCH Channel Description (optional)
CBCH Mobile Allocation
SI4 Rest Octets (parameters related to cell reselection)
SYS INFO 4
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CBCH Channel Description and CBCH MA
These two parameters are optional. When system supports
cell broadcast, CBCH Channel Description explains the CBCH
channel configuration situation. When CBCH Channel is in
frequency hopping mode, CBCH MA is also needed.
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SI4 Rest Octets
It contains the following parameters:
Cell Reselection Parameter Indicator (PI)
Cell Bar Qualify (CBQ)
Cell Bar Access (CBA)
Cell Reselect Offset (CRO)
Temporary Offset (TO)
Penalty Time (PT)
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SYS INFO 5
SYS INFO 5
It describes the neighbor cell BCCH frequencies(BA2 list). It is
mandatory and is transmitted on SACCH. Different from SYS INFO
2, MS can read the frequency described in SYS INFO 5 in dedicated
mode, report the relevant information of neighbor cells in
measurement reports, and use it as the basis for handover. Similarly,
for 900 MS of PHASE 1, it only recognizes the neighbor cell
frequencies described by SYS INFO 5, and ignores those carried by
SYS INFO 5BIS and 5TER.
Content
SYS INFO 5
Neighbor Cell Description
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SYS INFO 5BIS
SYS INFO 5BIS
5BIS describes neighbor cells BCCH frequencies.These
frequencies are part of BA2 list. It is optional and is
transmitted on SACCH. Generally, as the number of
frequencies which can be described by SYS INFO 5 is
limited, SYS INFO 5BIS carries the rest BCCH frequencies
in the BA2 which belong to the same band as SYS INFO 5.
Content
SYS INFO 5BIS
Neighbor Cell Description
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SYS INFO 5TER
SYS INFO 5TER
5TER describes neighbor cells BCCH frequencies, these
frequencies are also a part of the BA2 list. It is transmitted
on SACCH. Similarly, only dual band MS can read this
information, and single band GSM900 or GSM1800 MS will
ignore it. It carries the BCCH frequencies of neighbor cells
whose band are different from the serving cells.
Content
SYS INFO 5TER
Neighbor Cell Description (Extended)
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SYS INFO 6
SYS INFO 6
It describes LAI, cell identity, and some parameters
describing the cells functions. It is transmitted on SACCH.
It is also one of the most important system information.
Content
SYS INFO 6
Cell Identity
LAI Cell Option
NCC Permitted
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Chapter 1Chapter 1 System Information OverviewSystem Information Overview
Chapter 2Chapter 2 Parameters IntroductionParameters Introduction
Chapter 3Chapter 3
Case StudyCase Study
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Introduction to SYS INFO Parameters
Huawei GSM System Information Parameters:
Network Identity Parameters
System Control Parameters
Cell Selection Parameters
Network Functional Parameters
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Network Identity Parameter CGI
Network identity parameters mainly include cell global identity
(CGI) and base station identity code (BSIC).
CGI=MCC+MNC+LAC+CI
Once MS receives SYS INFO, it decodes the CGI information,
and decides whether it can stay in the cell according to the
MCC and MNC indicated by CGI. At the same time, it judges
whether the current location area is changed, so as to decide
whether to execute location update. During the location update
process, MS will report the new LAI to the network, so that thenetwork can know the LA in which MS is currently located.
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Network Identity Parameter BSIC
BSIC=NCC+BCC
In GSM system, each BTS is allocated with a color code, which
is called BSIC. MS can identify two cells with the same BCCH
by the help of BSIC. In network planning, effort should be
made to make sure that BCCH of neighbor cells are different
from the serving cells BCCH to reduce the interference.
Practically it is still possible that a same BCCH is re-used in
the surrounding cells. For cells using the same BCCH in a
relevant near distance, their BSIC must be different so that MS
can identify two neighbor cells with same BCCH.
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Mobile Country CodeMCC
Definition
MCC consists of 3 decimal numbers. It indicates the home
country of the mobile subscriber.
Format
MCC is composed of 3 decimal numbers. The coding range
is decimal 000-999.
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Mobile Network CodeMNC
Definition
MNC is used to uniquely identify a specific GSM PLMN
network in a certain country (decided by MCC).
Format
MNC is composed of two decimal numbers. The coding
range is decimal 00-99.
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Location Area Code LAC
Definition
To locate the location of MS, the whole area covered by
each GSM PLMN is divided into different location areas.
LAC is used to identify different location areas.
Format
LAI contains LAC, which is composed of two bytes. LAC
adopts hexadecimal coding. The available range is from
0001H to FFFEH. The code 0000H and FFFFH cannot be
used (please refer to specification GSM0303, 0408, and1111). One location area can contain one or more cells.
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Cell Identity CI
Definition
To uniquely identify each cell in the GSM PLMN, the network
operator needs to allocate one code for each cell, which is the
cell identity (CI). Cell identity, together with LAI, is used for
identity of each cell in the world. (specification 0303).
Format
CI is composed of 16 bits, The available range is from 0 to
65535.
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Network Color Code NCC
Definition
NCC is a part of BSIC. MS uses it to distinguish adjacent
BTS that belong to different GSM PLMN.
Format
NCC is composed of 3 bits, with the range of 0 to 7.
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BTS Color Code BCC
Definition
BCC is a part of BSIC. For its function, please refer to above
sections.
Format
BCC is composed of 3 bits. The available range is from 0 to 7.
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System Control Parameters
ATT
CCCH_CONF
BS_AG_BLKS_RES
BS_PAMFRAMES T3212
Radio Link Timeout
Neighbor Cell Description
NCC Allowed
MS MAX Retrans
TX-Integer
Common Access Control Class MBR
ECSC
heck it it means that once we power off it system does not consider it in the next paging signals othe
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ATT
Value range: Yes, No
Content It is used to inform MS whether IMSI attach-detach
is allowed in this cell. If it is set to Yes, the network will not
process the connection to the called mobile subscriber when
MS is power-off. Thus network processing time and radio
resources are saved. Otherwise the network will process the
connection even though the MS has been powered off.
Recommendation Yes
heck it, it means that once we power off it system does not consider it in the next paging signals othe
ered off and u moved to cell B and then powered on in cell B but the ATT box was not checked so th
r off and out of coverage message until you make a call (System will wake up) and u are powered on
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CCCH_CONF
Value range: 1 Non-Compounding CCCH, 1 Compounding
CCCH, 2 Non-Compounding CCCHs, 3 Non-compounding
CCCHs, 4 Non-compounding CCCHs.
Content: It is Common Control Channel Configuration. CCCH
configuration determines the capacity of PCH, AGCH and
RACH. This parameter can be automatically configured by the
BSC Data Auto Configuration System according to the TRX
channel configuration.
Recommendation: When there is one TRX in the cell, one
combined CCCH is recommended (in a system with few
paging messages in location area). For others, it is configured
according to the number of TRX in the cell.
mpounding CCCH (BCCCH is alone in the time slot, compounding (both BCCH and SDCCH together
Extended BCCH for Paging on the expense of TCH only TS 2, 4, and 6 can be co
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BS_AG_BLKS_RES
Value range: 0~2 (1 combined CCCH), 0~7 (others)
Unit: Block
Content: It is also called Access Granted Blocks Reserved. It is
the number of CCCH channel message blocks that are reserved
in one multi-frame for access granted channels (AGCH).
Recommendation: 2 (non-combined CCCH)
See note
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BS_PA_MFRAMES
Value range: 2 9
Unit: Multi-frame period (51 frames)
Content: It is Paging Channel Multi-frames. It defines the
number of multi-frames used as a cycle of paging sub-
channels.
Recommendation: 2
Combine two multiframes in one paging cycle so instead of having 7 PCH u have 14 PCH
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Application of T3212
Even if T3212 setting is less than the system (MSC) query
time, the system will still sometimes voice The subscriber you
dialed is powered off. ((Taxi Drivers MS))
A B
T3212=4 T3212=8
LAC
Ping-pong Reselect
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Radio Link Timeout
Value range: 4~64, the step size is 4
Unit: SACCH period (480ms)
Content: This parameter is used for MS to decide down-link
disconnection in case of SACCH decoding failures.
Recommendation: 20~56
Check the downlink qualityfor the dedicated mode
-Call drop responsible
Check the downlink qualityfor the dedicated mode
-Call drop responsible
1 Measure Report: 4 SACCH TDMA frames: 15 0r26*8 TS* 26 TCH-frames*4 SACCH = 480 ms=
0.55 Sec (The length of the Measurement report
1 Measure Report: 4 SACCH TDMA frames: 15 0r26*8 TS* 26 TCH-frames*4 SACCH = 480 ms=
0.55 Sec (The length of the Measurement report
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Application of Radio Link Timeout (RLT)
cell level command
Impact of radio link timeout
A B
P Q
Poor coverage
For example RLT here is set to 4 (within 2seconds level is 0) and you need to spend 55
seconds in the poor coverage area call will drop,if the RTL is 40 u will not drop
But sometimes you will keep the call withhorrible quality
For example RLT here is set to 4 (within 2seconds level is 0) and you need to spend 55
seconds in the poor coverage area call will drop,if the RTL is 40 u will not drop
But sometimes you will keep the call withhorrible quality
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Neighbor Cell Description
There are table BA1 and table BA2.
Table BA1 describes BCCH frequencies of the adjacent cells to
be measured when the MS is in idle mode.
Table BA2 describes BCCH frequencies of the adjacent cells to
be measured when the MS is in dedicated mode.
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Theoretical Neighbor Cells Actual Neighbor Cells
B
CA
D
B
CA
D
Application of Neighbor Cell Description
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B
C
A
A
Application of Neighbor Cell Description
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NCC Allowed
Value range: Check box, including options 0~7.
Content: Network Color Code, sent in system information 2
and 6. It lists NCC that need be measured by MS. If a neighbor
cells NCC is permitted, MS will report MRs of it to the network.
Recommendation: Subject to the concrete conditions.
NCC=0
.
.
.
.NCC=7
NCC=0
.
.
.
.NCC=7
If the NCC is not checked so you cannot makeHO but u can reselect, some operators do not
check it to keep u forced on the same operator
If the NCC is not checked so you cannot makeHO but u can reselect, some operators do not
check it to keep u forced on the same operator
How many time you send theRACH
How many time you send theRACH
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MS MAX Retrans
Value range: 1, 2, 4, 7 times
Unit: Time
Content: It is one of the random access control parameters. MS MAX
Retrans is the upper limit of times that MS is allowed to send Channel
Request in one immediate assignment procedure.
Recommendation:
Set to 7 for areas with low traffic (suburban or rural area) and the
cell radius more than 3 km.
Set to 4 for areas with ordinary traffic (non-busy area in the city)
and the cell radius is less than 3km.Set to 2 for micro-cell
Set to 1 for micro-cell with heavy traffic or with obvious congestion.
Set to 4 or 7 for satellite transmission BTS.
Access burst is so short because we still do notknow the TA
Access burst is so short because we still do notknow the TA
RACHRACH
B
T
S
B
T
S
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TX-Integer (T)
Value range: 3~12, 14, 16, 20, 25, 32, 50
Unit: RACH timeslot (equals to a TDMA frame, 4.615ms)
Content: Used to calculate the number of timeslots in the interval
between multiple channel requests sent by MS.
Recommendation: 20 (If the cell immediate assignment success rate
is low, set the S with a larger value. Select 32 for satellite
transmission, so as to reduce satellite transmission delay).
To avoid more than one MS asking for the AGCHat same time, randomly the MSs will ask for the
RACH within 20 time slots
To avoid more than one MS asking for the AGCHat same time, randomly the MSs will ask for the
RACH within 20 time slots
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Calculation of S (Waiting time)
ST
Combined CCCH Non-combined CCCH
3, 8, 14, 50 55 41
4, 9, 16 76 52
5, 10, 20 109 58
6, 11, 25 163 86
7, 12, 32 217 115
S: should not be big, except in case of
satellite transmission other wise we will
have SDCCH congestion
S: should not be big, except in case of
satellite transmission other wise we will
have SDCCH congestion
Because we have
less BCCH
channels time is
longer than main
CCCH
Because we have
less BCCH
channels time is
longer than main
CCCH
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Common Access Control Class
Value range: Check box, including level 0 forbidden,lever 1
forbidden,, till level 9 forbidden
Content: One of the parameters of random access control
information. It is used for load control of ordinary subscribers, to
permit or forbid the network access of some common level users. 1stands for forbidden and 0 for permitted.
Recommendation: 0000000000
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Special Access Control Class
Value range: Check box, including level 11 forbidden,level12
forbidden,, till level 15 forbidden
Content: It is used for load control, permitting or forbidding the
network access of some special level users. 1 stands for
forbidden and 0 for permitted.
Recommendation: 00000
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MBR
Value range: 0~3
Content: Multi-band Reporting. It is used to inform MS to report
the adjacent cells in a controllable way. It is sent in the System
Information 2ter and 5ter.
In the Measurement report you can report 1 serving cell and upto 6 highest
Neighbouring cells
MBR=0: not considering the top 6 cells belong to which band
MBR=1: 900:1, 1800:1; remained cells (4 neighbours) will be same serving band
neighbouring cells
MBR=2: 900:2, 1800:2; remained (2 neighbours) cells will be same serving band
neighbouring cells
In the Measurement report you can report 1 serving cell and upto 6 highest
Neighbouring cells
MBR=0: not considering the top 6 cells belong to which band
MBR=1: 900:1, 1800:1; remained cells (4 neighbours) will be same serving band
neighbouring cells
MBR=2: 900:2, 1800:2; remained (2 neighbours) cells will be same serving band
neighbouring cells
Best cells:
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Application of MBR (Usually not used in load balance)
- dBm- dBm
AB
C - dBm
D - dBm
E - dBm
F - dBm
G - dBm
H - dBm
GSM
GSMS
Best cells:
C
E
B
H
F
D
A
G
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ECSC
Value range: Yes, No
Content: Early Classmark Sending Control. It indicates if an
MS in the cell is allowed to use early Classmark sending. See
Protocol 0408.
Recommendation: No, if the MSC is Huawei product (by
default MSC will ask about it), and Recommendation is yes if
the MSC is not Huawei.
My dual band ability (power, etc)
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Cell Selection Parameter
CBQ (Cell Bar Qualify)
CBA (Cell Bar Access)
MS_TXPWR_MAX_CCH
RXLEV_ACCESS_MIN
PI (Cell Reselect Parameters Indication)
CRO (Cell Reselection Offset)
TO (Temporary Offset)
PT (Penalty Time)CRH ( Cell Reselection Hysteresis)
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Cell Selection Process
There are two kinds of cell selection.
Normal cell selection (you have to search all available freq.)
Stored list cell selection (Search Some freq.)
In fact, the process might be different for different MSs
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Stored List Cell Selection
Search the BCCH
which have been
stored
Can not find it
Normal cell
selection
Can find it
Can reside in it
Cant reside ,search
neighbor cell (BA1)
Come into
idle mode
NO
YES
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Normal Cell Selection
Search all frequency
Rank according to receiving level
Come into idle
mode
Check whether this is a BCCH carrier, get
SCH and decode system information
PLMN, C1>0, priority is normal
YES
Check next one
NO
NO
YES
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Normal Cell Selection
Check the next frequency by the same step
Check the cell which priority is low (i.e. lower power,
C1>0,PLMN
Come into idle
modeTry the cell which PLMN is allowed
in the SIM card
Stay at a cell which RX-LEV is strongest,
C1>0 , cell priority is not prohibitedEmergency call
mode (112)
NO
NO
YES
YES
YES
NO
YES
Rx-Access-Min: 8 = -102 dBm
Scale: 0 = 120 1= 110 etc
Rx-Access-Min: 8 = -102 dBm
Scale: 0 = 120 1= 110 etc
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Cell Selection Parameterto control the coverage
C1=RLA_C-RXLEV_ACCESS_MIN-MAX((MS_TXPWR_MAX_CCH-P), 0)
RLA_C: Receiving level of MS
RXLEV_ACCESS_MIN: Minimum receiving level of MS permitted to access
P: maximum Physical supported transmitting power of MS.
Scale: 0 = -120, 1=-110 etc
If we want the coverage to be less so we
increase this parameter to a higher value as
10 = -100 dB (so users with signal below this
value will not be able to access the NT)
Scale: 0 = -120, 1=-110 etc
If we want the coverage to be less so we
increase this parameter to a higher value as
10 = -100 dB (so users with signal below this
value will not be able to access the NT)
MS UL Configured power in theBSC in access burst
MS UL Configured power in theBSC in access burst
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CBQ
Value range: Yes , No
Unit: None
Content: Cell Bar Qualify. CBQ only affects the selection of cells but
is not related to cell reselection. It works with CBA to define the
access priorities of cells.
Recommendation: No.
In the Cell selection after PLMN, and C1, then
Priority and it is controlled by two parameters: CBQ
& CBA
Check the notes
In the Cell selection after PLMN, and C1, then
Priority and it is controlled by two parameters: CBQ
& CBA
Check the notes
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CBA
Value range: Yes, No
Content: Cell Bar Access, worked together with CBQ to set the
priority status of the cell in idle mode for cell selection and
reselection.
Recommendation: Yes
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Application of CBQ
The traffic of cell A and B is heavy. Set these two cells with
CBA=No, CBQ=No.
A B
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Application of CBA
B is a micro cell. Set B to Normal and A to Low.
B
A
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Application of CBA
CBQ(A) = NO CBA(A) = NO
A
C
B
D
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MS TXPWR_MAX_CCH
Value range: 0~31
Unit: level
Content: This parameter determines the maximum allowed
output power of the MS when it begins to access a cell and has
not yet received power control command.
Recommendation: 5(900MHz), 0(1800MHz)
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RXLEV_ACCESS_MIN
Value range: 0~63
Unit: Level
Content: It means the minimum receive signal level required
for MS to access a cell.
Recommendation: 8
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Cell Reselection Process
Cell reselection for cells in same location area If the C2 value of the target cell is higher than that of the serving cell for
longer than 5 seconds, a cell reselection process will be performed and the
MS tunes to the new cell.
Cell reselection for cells in different location areas
If the C2 value of the target cell is higher than that of the serving cell by at
least the value of CRH for longer than 5 seconds, a location update process
and the cell reselection process will be performed.
Two consecutive cell reselections caused by C2 have a time interval of 15
seconds. In other words to say, if because of C2 a MS reselected to a cell, then
the MS cannot reselect to another cell by the cause of C2 within 15 seconds.
If current serving cell is prohibited, or down link fails, or C1 is less than 0
continuously for 5s, cell reselection will also be triggered.
MS starts a cell reselection if the access times exceed the MAX retrans.
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Cell Reselection Parameter
C2=C1+CRO-TO*H(PT-T) When PT is not equal to 31
C2=C1-CRO When PT is equal to 31
Function H(x)=0, when x0
For serving cell TO*H(PT-T) = 0For serving cell TO*H(PT-T) = 0
T: is a timer, measures how long -in seconds-the
neighbouring cell remains in the best 6
neighboring cells and it is inside the step
function H(x)
After some time (in seconds you are trusted and
always acting as my neighbour , the H(x)=0
(when PT-T=0) and at this time no more penalty
for you (PT) because it is a trusted neighbour
T: is a timer, measures how long -in seconds-the
neighbouring cell remains in the best 6
neighboring cells and it is inside the step
function H(x)
After some time (in seconds you are trusted and
always acting as my neighbour , the H(x)=0
(when PT-T=0) and at this time no more penalty
for you (PT) because it is a trusted neighbour
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PI
Value range: Yes (1), No (0).
Unit: None
Content: Cell Reselect Parameters Indication, sent on the
broadcast channel of the cell. It is an indication to the
existence of Cell Reselect Offset(CRO), Temporary
Offset(TO) and Penalty Time(PT).
Recommendation: Yes.
If we do not check the PI this means C2 = C1If we do not check the PI this means C2 = C1
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CRO
Value range: 0~63, the corresponding level value: 0~126dB,
stepped every 2dB.
Unit: None
Content: Cell Reselect Offset. It is a parameter in C2
calculation to give an intentional modification in MS cell
reselection.
Recommendation: 0
F i ll TO*H(PT T) 0
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TO
Value range: 0~7 , the corresponding value is 0~60dB, 7
corresponds to Infinite.
Unit: None
Content: Cell Reselect Temporary Offset. It is a parameter in
C2 criterion to give a temporary modification within PT time.
Recommendation: 0
For serving cell TO*H(PT-T) = 0
TO:1 = 10 dB
For serving cell TO*H(PT-T) = 0
TO:1 = 10 dB
You will punish the neighbouring cell for PT
You will punish the neighbouring cell for PT
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PT
Value range: 0~31, the corresponding time is 20~620s. 31 is to
change the formula of C2.
Unit: None
Content: Cell Reselect Penalty Time.
Recommendation: 0
p g g
period
PT:0 = 20 Seconds
p g g
period
PT:0 = 20 Seconds
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CRH
Value range: 0~14 , the step size is 2
Unit: dB
Content: Cell Reselection Hysteresis. It is the parameter used
when cell reselection happens between two location areas.
Recommendation: 4
To avoid so many ReselectionTo avoid so many Reselection
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Network Function Parameter
PWRC (Power Control Permitted)
UL DTX (Uplink Discontinuous Transmission)
Call Re-establishment Allowed (RE)
EC Allowed (Emergency Call Allowed)
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PWRC
Value range: Yes, No.
Unit: None
Content: It is used to indicate MS weather to reduce received
level value obtained from the timeslots of BCCH when MS
measures receiving level during base band hopping mode.
When it is set to No, it means the influence of receiving level
on BCCH is not in consideration. If it is set to Yes, process it
in the way mentioned above.
Recommendation: Yes
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If the call drop while moving from an area to
If the call drop while moving from an area to
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Call Re-establishment Allowed
Value range: Yes, No
Unit: None
Content: Informing MS whether call reestablishment is allowed
or not.
Recommendation: No
another MS will automatically reestablish and it
is different from the redial in case of busy
another MS will automatically reestablish and it
is different from the redial in case of busy
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EC Allowed
Value range: Yes, No
Unit: None
Content: Emergence Call Allowed . When EC Allowed is set to
Yes, it means emergency call is permitted. Otherwise it is
prohibited.
Recommendation: Yes.
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Others in Data Configuration System
System Information Usage
Regular Transmission
Regular Transmission Interval
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System Information Usage
Value Range: It is a check box, including system information
1~12, 2bis, 2ter, 5bis, 5ter, 10bis.
Unit: None
Content: It is used to determine whether a type of system
information should be sent. A selected box means to send.
Recommendation: Select system information 1~6, 2bis, 2ter,
5bis, 5ter
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Regular Transmission
Value range: Yes, No
Unit: None
Content: It shows whether BSC chooses to update system
information contents transmitted by BTS. If it is Yes, BSC will
send system information to BTS at a certain interval (it is
decided by Regular Transmission Interval). Otherwise,
system information can only be updated manually by using
BSC maintenance system.
Recommendation: Yes
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Regular Transmission Interval
Value range: 0~255
Unit: Minute
Content: It stipulates the time interval that BSC updates
system information to BTS.
Recommendation: 10 minutes
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Chapter 1Chapter 1 System Information OverviewSystem Information Overview
Chapter 2Chapter 2 Parameters IntroductionParameters Introduction
Chapter 3Chapter 3 Case StudyCase Study
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Case Study
Case Description
During the process of optimization in a certain area, it is
found out that the signal is poor in a certain section of
suburban highway. The signal strength measured is less
than -95dBm. Handling Procedure
Modify the data in BSC. Add neighbor relationship to Cell A
and B for each other. The coverage problem is thus solved.
Case 1: Island effect
C
B
A-92
-80
-95
Case Study
Case 2: Incorrect CGI causes MS unable to register on the network
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Case description
The subscriber complained that MS could not register to the
network, or it was difficult to register to the network between
BTS A and B, or no network mark was displayed on the MS, but
MS indicated that the signal was very good. Some subscribers
also complained that MS could make MTC could not make
MOC.
Note: If you configure it wrongly you can receive a call because it is coming
thru the Paging siganl and eventhough the reselection is BSC level not MSC
level so even if your Cell CGI is wrongly configured you can camp on it andreceive a call but not originate a call because originating requires MSC
pathway and u have wrong cell CGI
Cause analysis
CGI of the cell was modified. So the network register flow was
not normal. Although the signal was very good, MS could not get
registered in the network.
Recommendation and summary
CGI is a very important parameter and should be configured
correctly, thus to ensured that the CGI data in BSC and MSC
are the same.
Case 2: Incorrect CGI causes MS unable to register on the network.
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Case Study
Case description
Subscribers complain that the signal fluctuates in a certain area. On-site
test shows that this phenomenon does exist. From the testing mobile,
we can see that there are a lot of cells signals in this area. Some
frequencies are the suburb BTS signals far away from this area. The cell
reselection of MS is rather frequent.
Handling procedure
Modify parameter RXLEV_ACCESS_MIN of all cells in urban area and
make them consistent with each other. The problem of signal fluctuation
is solved.
Recommendation and summary
In area with complicated coverage, the RXLEV_ACCESS_MIN of each
cell should be kept same.
Case 3: RXLEV_ACCESS_MIN causes signal fluctuation.
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Case description
A local GSM network has more than 6000 subscribers. There are four
BTSs. The network has been working properly. But from sometime on,
some MS often lost connection with network suddenly. The complaintfrom subscribers in urban area increased.
Handling procedure
Modify T3212 to 10, i.e. 60 minutes. Modify the corresponding time of
MSC to 180 minutes. Two days observation shows no subscriber
complaint and the problem is solved.
Case 4 Too small T3212 causes MS lose connection with network.
Case Study
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