UMTS RNO Subject-Commercial Multi-Carrier Networking Guide_R1.0.docx
Transcript of UMTS RNO Subject-Commercial Multi-Carrier Networking Guide_R1.0.docx
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UMTS Commercial Multi-Carrier
Networking GuideR1.0
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Revision History
Product Version Document Version Serial Number Reason for Revision
All RNS versions R1.0 First published
Author
Date Document Version Prepared by Reviewed by Approved by
2010-3-31 R1.0 Bai XuehuaUMTS RNO ChiefEngineer Group
Wang Zhenhai
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About This Document
Summary
Chapter Description
1 Overview Briefly introduces carrier expansion and the contents of this
document.2 Dual-Carrier NetworkingStrategies
Describes some commonly used dual-carrier networkstrategies in detail.
3 Triple-Carrier NetworkingStrategies
Describes some commonly used triple-carrier networkstrategies in detail.
4 Case Study Makes a case study.
5 Conclusion Concludes this document.
AppA Glossary Lists the acronyms in this document.
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TABLE OF CONTENTS
1 Overview ......................................................................................................... 12 Dual-Carrier Networking Strategies............................................................... 22.1 General Care .................................................................................................... 22.2 Strategy 1: F1-R99+HSPA; F2-R99+HSPA ...................................................... 32.2.1 Relevant Strategies .......................................................................................... 32.2.2 Configuration of Radio Parameters ................................................................... 42.3 Strategy 2: F1-R99; F2-R99+HSPA .................................................................. 62.3.1 Relevant Strategies .......................................................................................... 72.3.2
Configuration of Radio Parameters ................................................................... 8
2.4 Strategy 3: F1-R99+HSPA; F2-HSPA ............................................................. 102.4.1 Relevant Strategies ........................................................................................ 112.4.2 Configuration of Radio Parameters ................................................................. 122.5 Strategy 4: F1-R99; F2-HSPA ........................................................................ 142.5.1 Relevant Strategies ........................................................................................ 152.5.2 Configuration of Radio Parameters ................................................................. 163 Triple-Carrier Networking Strategies........................................................... 193.1 General Care .................................................................................................. 193.2 Strategy 1: F1-R99+HSPA; F2-R99+HSPA; F3-R99+HSPA ........................... 203.2.1 Relevant Strategies ........................................................................................ 213.2.2 Configuration of Radio Parameters ................................................................. 213.3 Strategy2: F1-R99; F2-HSPA; F3-HSPA ......................................................... 243.3.1 Relevant Strategies ........................................................................................ 253.3.2 Configuration of Radio Parameters ................................................................. 264 Case Study .................................................................................................... 294.1 Reselection of Idle UEs .................................................................................. 294.2 Service Balance Enabled in Both the RRC and RAB Connection Setup
Procedures ..................................................................................................... 304.3 Service Balance Enabled in the RRC Connection Setup Procedure Only ....... 304.4 Comparison Result ......................................................................................... 315 Conclusion .................................................................................................... 32AppA Glossary ........................................................................................................ 33
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FIGURES
Figure 2-1 Dual-Carrier Networking Strategy 1 ..................................................................... 3Figure 2-2 Dual-Carrier Networking Strategy 2 ..................................................................... 7Figure 2-3 Dual-Carrier Networking Strategy 3 ................................................................... 11Figure 2-4 Dual-Carrier Networking Strategy 4 ................................................................... 15Figure 3-1 Triple-Carrier Networking Strategy 1 ................................................................. 20Figure 3-2 Triple-Carrier Networking Strategy 2 ................................................................. 24Figure 4-1 OMC Statistics on Connection Success Rates of Idle UEs in Free Selection Mode............................................................................................................................................. 29
Figure 4-2 OMC Statistics on Connection Success Rates When Service Balance WasEnabled in Both the RRC and RAB Connection Setup Procedures ....................................... 30Figure 4-3 OMC Statistics on Connection Success Rates When Service Balance WasEnabled in the RRC Connection Setup Procedure Only ....................................................... 31
TABLES
Table 2-1 Parameter Settings to Balance the Service and Load During the Call Holding
Procedure ............................................................................................................................... 2
Table 2-2 Balance and Reselection Parameter Configuration (Strategy 1) ........................... 4Table 2-3 Parameter Configuration for Inter-Frequency HandoversInternal (Strategy 1) .. 5Table 2-4 Parameter Configuration for Inter-Frequency HandoversBorder (Strategy 1) ... 6Table 2-5 Balance and Reselection Parameter Configuration (Strategy 2) ........................... 9Table 2-6 Parameter Configuration for Inter-Frequency HandoversInternal (Strategy 2) 10Table 2-7 Parameter Configuration for Inter-Frequency HandoversBorder (Strategy 2) . 10Table 2-8 Balance and Reselection Parameter Configuration (Strategy 3) ......................... 12Table 2-9 Parameter Configuration for Inter-Frequency HandoversInternal (Strategy 3) 13Table 2-10 Parameter Configuration for Inter-Frequency HandoversBorder (Strategy 3) 14Table 2-11 Balance and Reselection Parameter Configuration (Strategy 4) ....................... 16Table 2-12 Parameter Configuration for Inter-Frequency HandoversInternal (Strategy 4)............................................................................................................................................. 17
Table 2-13 Parameter Configuration for Inter-Frequency HandoversBorder (Strategy 4) 18Table 3-1 Parameter Settings to Balance the Service and Load During the Call HoldingProcedure ............................................................................................................................. 19Table 3-2 Balance and Reselection Parameter Configuration (Strategy 1) ......................... 22
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Table 3-3 Parameter Configuration for Inter-Frequency HandoversInternal (Strategy 1) 23Table 3-4 Parameter Configuration for Inter-Frequency HandoversBorder (Strategy 1) . 23Table 3-5 Balance and Reselection Parameter Configuration (Strategy 2) ......................... 26Table 3-6 Parameter Configuration for Inter-Frequency HandoversInternal (Strategy 2) 28Table 3-7 Parameter Configuration for Inter-Frequency HandoversBorder (Strategy 2) . 28
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1 Overview
The UMTS networks are beginning to take shape both in China and overseas. In
particular, the fast development of broadband service has led to constant increases of the
network loads. When the load of a network reaches a certain level, there will be network
resource congestion. To ensure subscribers good high-speed access experience and
keep the competitiveness of UMTS networks, the engineers should monitor the network
loads in real time, give early alarms about the network elements whose loads exceed the
thresholds, and take prompt measures for network optimization or capacity expansion, so
as to make the networks meet the demands of service development.
Carrier expansion comprises the following two steps:1. Monitor and analyze the
expansion parameters, and decide whether to expand the carrier capacity.
2. After deciding to expand the capacity, choose a multi-carrier expansion strategy.
For details about the monitoring and analysis of the expansion parameters, see the
relevant expansion documents. And this document mainly introduces several strategies
for multi-carrier expansion.
To make best use of the carrier resources, we recommend using the UE free selection
mode to construct dual-carrier and triple-carrier networks.
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2 Dual-Carrier Networking Strategies
2.1 General Care
Because the UE will read the broadcast message after the PS service changes from
DCH state to FACH state, once the CELL BAR scheme is adopted for the cell, the
UE will perform inter-frequency cell reselection. This process may lead to PS call
drops. Therefore, when the field engineers construct multi-carrier networks, if the
CELL FACH state is activated, it is prohibited to adopt the CELL BAR scheme.
Considering the impact on the RRC and RAB connection setup success rates, the
field engineers can consider disabling the service-and-load balance strategy duringthe RRC and RAB connection setup procedures and just enabling the
service-and-load balance strategy during the call holding procedure. This solution is
similar to the current RAB-based service-and-traffic balance strategy and is mainly
used in the following scenarios:
Relocation for service from another RNC via the Iur interface
Handover
Call re-setup flow triggered by the CELL UPDATEmessage
Change from non-DCH state to DCH state
Table 2-1 lists the parameter settings to balance the service and load during the call
holding procedure.
Table 2-1 Parameter Settings to Balance the Service and Load During the Call HoldingProcedure
Balance Parameter F1 F2
Service Balance Switch of Call Holding
ProcedureOn On
Preferred Service Type CS Preferred PS Preferred
Load Balance Switch of Call Holding Procedure On On
UTRAN Downlink Load Balance Threshold(Power)
55% 55%
Permitted Payload Difference Downlink LoadThreshold in Inter-Frequency Cells (Power)
10% 10%
Downlink Power Weight for Load Balance 100% 100%
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2.2 Strategy 1: F1-R99+HSPA; F2-R99+HSPA
To make best use of the operators carrier resources, we recommend setting
dual-carriers to full service supported and letting idle UEs choose the origination carriersthrough free selection.
Figure 2-1 Dual-Carrier Networking Strategy 1
2.2.1 Relevant Strategies
2.2.1.1 Selection Strategy
The idle UE performs cell selection and reselection according to the Ec/No values of
the signals.
2.2.1.2 Move-Based Strategy
When the UE moves inside a multi-carrier area, it will only perform intra-frequency
handovers.
On a border between two multi-carrier areas, for example, the respective coverage
areas of two UARFCNs (F1 and F2, seeFigure 2-1), when the UE moves out of the
coverage area of F2, it will perform F2-to-F1 inter-frequency handovers. When the
UE moves inside the coverage area of F1, it will only perform intra-frequency
handovers. F1-to-F2 handovers based on UE moves (network coverage) are not
configured.
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2.2.1.3 Balance Strategy
The idle UE performs cell selection and reselection according to the Ec/No values of
the signals.
Both F1 and F2 cells bear CS and PS service, that is, they are both configured as
CS+PS Preferred.
All the balance switches of F1 and F2 cells are turned off.
The UE initiates service on the residence carrier.
2.2.2 Configuration of Radio Parameters
2.2.2.1 Cell Configuration
F1: R99+HSPA; CPICH 33 dBm
F2: R99+HSPA; CPICH 33 dBm
2.2.2.2 Configuration of Inter-Frequency Neighbor Cells
For co-sited and co-sector F1 and F2 cells, they should be mutually configured as
neighbor cells for reselection of idle UEs.
For F2 border cells, the surrounding F1 cells should be configured as their neighbor
cells for inter-frequency handovers.
2.2.2.3 Configuration of Inter-RAT Neighbor Cells
GSM cells should be configured as inter-RAT neighbor cells of both F1 and F2 cells.
Copy the inter-RAT GSM neighbor cells of F1 cells as those of F2 cells.
2.2.2.4 Configuration of Balance and Reselection Parameters
Table 2-2 Balance and Reselection Parameter Configuration (Strategy 1)
Selection or Reselection Parameter F1 F2
Measurement Quantity for Cell Selection andReselection
1(CPICH Ec/No) 1(CPICH Ec/No)
Sintersearch Configuration Tag False False
Qhyst2s 2 dB 2 dB
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Balance Parameter F1 F2
Measurement Quantity for Frequency QualityEstimate
CPICH RSCP CPICH RSCP
Threshold Used Frequency (Event 2D) 105 dBm 105 dBmThreshold Used Frequency (Event 2F) 102 dBm 102 dBm
Hysteresis (Event 2A) 4 dB 4 dB
Service Balance Switch of Initial RRCProcedure
Off Off
Service Balance Switch of RAB AssignmentProcedure
Off Off
Preferred Service Type CS+PS PreferredCS+PSPreferred
Load Balance Switch for Downlink Power Off Off
Load Balance Switch for Code Off OffLoad Balance Switch for Uplink Interference Off Off
Load Balance Switch of Initial RRCProcedure
Off Off
Load Balance Switch of RAB AssignmentProcedure
Off Off
Load Balance Switch of Call HoldingProcedure
Off Off
UTRAN Downlink Load Balance Threshold(Power)
55% 55%
UTRAN Downlink Load Balance Threshold
(Code) 50% 50%
Permitted Payload Difference Downlink LoadThreshold in Inter-Frequency Cells (Power)
10% 10%
Permitted Payload Difference Downlink LoadThreshold in Inter-Frequency Cells (Code)
10% 10%
Downlink Power Weight for Load Balance 100% 100%
Uplink Interference Weight for Load Balance 0% 0%
Code Weight for Load Balance 0% 0%
2.2.2.5 Configuration of Handover Parameters
Inter-frequency handoversinternal
Table 2-3 Parameter Configuration for Inter-Frequency HandoversInternal (Strategy1)
Category Service Type Event Name Parameter Name Value
Internal CS
2D THRESHUSEDFREQ 95
2D\2F HYSTERESIS 4
2D\2F TimetoTrigger 640 ms
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Category Service Type Event Name Parameter Name Value
2F THRESHUSEDFREQ 90
PS
2D THRESHUSEDFREQ 115
2D\2F HYSTERESIS 4
2D\2F TimetoTrigger 640 ms
2F THRESHUSEDFREQ 90
Inter-frequency handoversborder
Table 2-4 Parameter Configuration for Inter-Frequency HandoversBorder (Strategy1)
Category Service Type Event Name Parameter Name Value
Border
CS
2D THRESHUSEDFREQ 902D\2F HYSTERESIS 4
2D\2F TimetoTrigger 640 ms
2F THRESHUSEDFREQ 87
PS
2D THRESHUSEDFREQ 115
2D\2F HYSTERESIS 4
2D\2F TimetoTrigger 640 ms
2F THRESHUSEDFREQ 102
2.3 Strategy 2: F1-R99; F2-R99+HSPA
If HSPA and R99 service is mixed on a carrier, it will cause Ec/Io fluctuations to the cell,
that is, the inhalation and exhalation effects of the cell will become obvious gradually. To
ensure the R99 users especially the CS service users good service experience, the
engineers can separately assign R99 service to a UARFCN (for example, F1 inFigure
2-2), so as to avoid the impact of HSPA service on CS service.
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Figure 2-2 Dual-Carrier Networking Strategy 2
2.3.1 Relevant Strategies
2.3.1.1 Selection Strategy
Set cell reselection parameters to let the idle UE reside on an F1 cell.
Do not let the UE reside on any F2 cell.
2.3.1.2 Move-Based Strategy
When the UE moves inside a multi-carrier area, intra-frequency soft handovers are
preferred. Inter-frequency service balance is only performed from F1 cells to F2
cells.
On a border between two multi-carrier areas, when the UE moves out of the
coverage area of F2, it will perform F2-to-F1 inter-frequency handovers.
2.3.1.3 Balance Strategy
Enable service balance during the RRC and RAB connection setup procedures.
Enable load balance based on DL power for F1 cells.
When the UE initiates R99 CS service, the service will be preferable set up on an F1
cell.
When the UE initiates R99 PS service, the service will be shifted from an F1 cell to
an F2 cell through service balance in the RRC connection setup procedure.
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When the UE initiates HSPA service, the service will be shifted to an F2 cell and
accessed through service balance or UE capacity balance in the RRC connection
setup procedure.
For concurrent CS and PS service (the CS service taking place first and then the PS
service), the R99 PS service will be carried on an F1 cell.
For concurrent PS and CS service (the PS service taking place first and then the CS
service), the CS service will be carried on an F2 cell.
When the UE in a single-carrier area initiates HS service and moves toward the
border of a dual-carrier area, if the local R99 cell is not configured with a
co-coverage and inter-frequency HS neighbor cell, there will be a co-frequency hard
handover; if the local cell is configured with a co-coverage and inter-frequency HS
neighbor cell, the service will be handed over to the co-coverage and
inter-frequency HS neighbor cell.
2.3.2 Configuration of Radio Parameters
2.3.2.1 Cell Configuration
F1: R99; CPICH 33 dBm
F2: R99+HSPA; CPICH 33 dBm
2.3.2.2 Configuration of Inter-Frequency Neighbor Cells
The F2 cells co-sited with F1 cells should be configured as the co-coverage and
inter-frequency neighbor cells of F1 cells.
For F2 border cells, the surrounding F1 cells should be configured as their
inter-frequency neighbor cells.
2.3.2.3 Configuration of Inter-RAT Neighbor Cells
Only F1 cells can be configured as neighbor cells of GSM cells.
GSM cells should be configured as inter-RAT neighbor cells of both F1 and F2 cells.
Copy the inter-RAT GSM neighbor cells of F1 cells as those of F2 cells.
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2.3.2.4 Configuration of Balance and Reselection Parameters
Table 2-5 Balance and Reselection Parameter Configuration (Strategy 2)
Selection or Reselection Parameter F1 F2
Measurement Quantity for Cell Selection andReselection
1(CPICH Ec/No) 1(CPICH Ec/No)
Sintersearch Configuration Tag True False
Sintersearch 10 dB 10 dB
Qhyst1s 10 dB 10 dB
Qhyst2s 2 dB 2 dB
Qoffset1s,n in SIB11 0 dB 0 dB
Qoffset2s,n in SIB11 50 dB 50 dB
Balance Parameter F1 F2
Service Balance Switch of Initial RRCProcedure
On Off
Service Balance Switch of RAB AssignmentProcedure
On Off
Service Balance Switch of Call HoldingProcedure
Off Off
Preferred Service Type CS Preferred PS Preferred
Load Balance Switch for Downlink Power On Off
Load Balance Switch for Code Off Off
Load Balance Switch for Uplink Interference Off Off
Load Balance Switch of Initial RRCProcedure
On forinter-frequencyload balance only
Off
Load Balance Switch of RAB AssignmentProcedure
On forinter-frequencyload balance only
Off
Load Balance Switch of Call HoldingProcedure
Off Off
UTRAN Downlink Load Balance Threshold(Power)
55% 55%
UTRAN Downlink Load Balance Threshold(Code)
50% 50%
Permitted Payload Difference Downlink LoadThreshold in Inter-Frequency Cells (Power)
10% 10%
Permitted Payload Difference Downlink LoadThreshold in Inter-Frequency Cells (Code)
10% 10%
Downlink Power Weight for Load Balance 100% 50%
Uplink Interference Weight for Load Balance 0% 0%
Code Weight for Load Balance 0% 50%
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2.3.2.5 Configuration of Handover Parameters
Inter-frequency handoversinternal
Table 2-6 Parameter Configuration for Inter-Frequency HandoversInternal (Strategy2)
Category Service Type Event Name Parameter Name Value
Internal
CS
2D THRESHUSEDFREQ 95
2D\2F HYSTERESIS 4
2D\2F TimetoTrigger 640 ms
2F THRESHUSEDFREQ 90
PS
2D THRESHUSEDFREQ 115
2D\2F HYSTERESIS 42D\2F TimetoTrigger 640 ms
2F THRESHUSEDFREQ 102
Inter-frequency handoversborder
Table 2-7 Parameter Configuration for Inter-Frequency HandoversBorder (Strategy2)
Category Service Type Event Name Parameter Name Value
Border
CS
2D THRESHUSEDFREQ 90
2D\2F HYSTERESIS 4
2D\2F TimetoTrigger 640 ms
2F THRESHUSEDFREQ 87
PS
2D THRESHUSEDFREQ 115
2D\2F HYSTERESIS 4
2D\2F TimetoTrigger 640 ms
2F THRESHUSEDFREQ 102
2.4 Strategy 3: F1-R99+HSPA; F2-HSPAIn some cases, R99 service is rare and HSPA takes up a large proportion during the
network development. Besides, the purpose of adding a second UARFCN (for example,
F2 inFigure 2-3)is to promote HSPA service. At this time, the engineers can consider
setting the first UARFCN (F1 inFigure 2-3)in mixed mode (R99+HSPA, to support a little
R99 service) and setting F2 for HSPA only.
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Figure 2-3 Dual-Carrier Networking Strategy 3
2.4.1 Relevant Strategies
2.4.1.1 Selection Strategy
Set cell reselection parameters to let the idle UE reside on an F1 cell.
Do not let the UE reside on any F2 cell.
2.4.1.2 Move-Based Strategy
When the UE moves inside a multi-carrier area, it will only perform intra-frequency
handovers. Inter-frequency operations can only be F1-to-F2 operations triggered by
service balance.
On a border between two multi-carrier areas, when the UE moves out of the
coverage area of F2, it will perform F2-to-F1 inter-frequency handovers. When the
UE moves inside the coverage area of F1, it will only perform intra-frequency
handovers. F1-to-F2 handovers based on UE moves (network coverage) are not
configured.
2.4.1.3 Balance Strategy
Enable service balance during the RRC and RAB connection setup procedures.
Enable load balance based on DL power for F1 cells.
When the UE initiates R99 service, the service will be preferable set up on an F1
cell.
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Qoffset1s,n in SIB11 0 dB 0 dB
Qoffset2s,n in SIB11 50 dB 50 dB
Balance Parameter F1 F2
Service Balance Switch of Initial RRCProcedure
On Off
Service Balance Switch of RAB AssignmentProcedure
On Off
Service Balance Switch of Call HoldingProcedure
Off Off
Preferred Service Type CS Preferred PS Preferred
Load Balance Switch for Downlink Power On Off
Load Balance Switch for Code Off Off
Load Balance Switch for Uplink Interference Off Off
Load Balance Switch of Initial RRCProcedure
On forinter-frequencyload balance only
Off
Load Balance Switch of RAB AssignmentProcedure
On forinter-frequencyload balance only
Off
Load Balance Switch of Call HoldingProcedure
OffOff
UTRAN Downlink Load Balance Threshold(Power)
55% 55%
UTRAN Downlink Load Balance Threshold
(Code)
50% 50%
Permitted Payload Difference Downlink LoadThreshold in Inter-Frequency Cells (Power)
10% 10%
Permitted Payload Difference Downlink LoadThreshold in Inter-Frequency Cells (Code)
10% 10%
Downlink Power Weight for Load Balance 100% 100%
Uplink Interference Weight for Load Balance 0% 0%
Code Weight for Load Balance 0% 0%
2.4.2.5 Configuration of Handover Parameters
Inter-frequency handoversinternal
Table 2-9 Parameter Configuration for Inter-Frequency HandoversInternal (Strategy3)
Category Service Type Event Name Parameter Name Value
Internal CS
2D THRESHUSEDFREQ 95
2D\2F HYSTERESIS 4
2D\2F TimetoTrigger 640 ms
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Category Service Type Event Name Parameter Name Value
2F THRESHUSEDFREQ 90
PS
2D THRESHUSEDFREQ 115
2D\2F HYSTERESIS 4
2D\2F TimetoTrigger 640 ms
2F THRESHUSEDFREQ 102
Inter-frequency handoversborder
Table 2-10 Parameter Configuration for Inter-Frequency HandoversBorder (Strategy3)
Category Service Type Event Name Parameter Name Value
Border
CS
2D THRESHUSEDFREQ 902D\2F HYSTERESIS 4
2D\2F TimetoTrigger 640 ms
2F THRESHUSEDFREQ 87
PS
2D THRESHUSEDFREQ 115
2D\2F HYSTERESIS 4
2D\2F TimetoTrigger 640 ms
2F THRESHUSEDFREQ 102
2.5 Strategy 4: F1-R99; F2-HSPA
Some operators may request that R99 and HSPA service should be carried separately. In
this case, the following networking strategy can be adopted: setting the first UARFCN (F1)
for DCH cells and setting the second UARFCN (F2) for HSPA only.
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Figure 2-4 Dual-Carrier Networking Strategy 4
2.5.1 Relevant Strategies
2.5.1.1 Selection Strategy
Set cell reselection parameters to let the idle UE reside on an F1 cell.
Do not let the UE reside on any F2 cell.
2.5.1.2 Move-Based Strategy
When the UE moves inside a multi-carrier area, it will only perform intra-frequency
handovers. Inter-frequency operations can only be F1-to-F2 operations triggered by
service balance
On a border between two multi-carrier areas, when the UE moves out of the
coverage area of F2 (see Figure 2-4), it will perform F2-to-F1 inter-frequency
handovers. When the UE moves inside the coverage area of F1, it will only perform
intra-frequency handovers. F1-to-F2 handovers based on UE moves (network
coverage) are not configured.
2.5.1.3 Balance Strategy
Enable service balance during the RRC and RAB connection setup procedures.
Enable load balance based on DL power for F1 cells.
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When the UE initiates R99 service, the service will be preferable set up on an F1
cell.
When the UE initiates HSPA service, the service will be shifted to an F2 cell and
accessed through service balance or UE capacity balance in the RRC and RAB
connection setup procedures.
When there is concurrent PS and CS service (the PS service taking place first and
then the CS service) on an F2 cell, once the PS service is released, an F2-to-F1
inter-frequency handover will be triggered.
2.5.2 Configuration of Radio Parameters
2.5.2.1 Cell Configuration
F1: R99; CPICH 33 dBm
F2: HSPA; CPICH 33 dBm
2.5.2.2 Configuration of Inter-Frequency Neighbor Cells
The F2 cells co-sited with F1 cells should be configured as the co-coverage and
inter-frequency neighbor cells of F1 cells; vice versa.
For F2 border cells, the surrounding F1 cells should be configured as their
inter-frequency neighbor cells.
2.5.2.3 Configuration of Inter-RAT Neighbor Cells
Only F1 cells can be configured as neighbor cells of GSM cells.
GSM cells should be configured as inter-RAT neighbor cells of both F1 and F2 cells.
Copy the inter-RAT GSM neighbor cells of F1 cells as those of F2 cells.
2.5.2.4 Configuration of Balance and Reselection Parameters
Table 2-11 Balance and Reselection Parameter Configuration (Strategy 4)
Selection or Reselection Parameter F1 F2
Measurement Quantity for Cell Selection andReselection
1(CPICH Ec/No) 1(CPICH Ec/No)
Sintersearch Configuration Tag True False
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Sintersearch 10 dB 0 dB
Qhyst1s 10 dB 10 dB
Qhyst2s 2 dB 2 dB
Qoffset1s,n in SIB11 0 dB 0 dB
Qoffset2s,n in SIB11 50 dB 50 dB
Balance Parameter F1 F2
Service Balance Switch of Initial RRCProcedure
On Off
Service Balance Switch of RAB AssignmentProcedure
On Off
Preferred Service Type CS Preferred PS Preferred
Load Balance Switch for Downlink Power On Off
Load Balance Switch for Code Off Off
Load Balance Switch for Uplink Interference Off Off
Load Balance Switch of Initial RRCProcedure
On forinter-frequencyload balance only
Off
Load Balance Switch of RAB AssignmentProcedure
On forinter-frequencyload balance only
Off
Load Balance Switch of Call HoldingProcedure
Off Off
UTRAN Downlink Load Balance Threshold(Power)
55% 55%
UTRAN Downlink Load Balance Threshold(Code)
50% 50%
Permitted Payload Difference Downlink LoadThreshold in Inter-Frequency Cells (Power)
10% 10%
Permitted Payload Difference Downlink LoadThreshold in Inter-Frequency Cells (Code)
10% 10%
Downlink Power Weight for Load Balance 100% 100%
Uplink Interference Weight for Load Balance 0% 0%
Code Weight for Load Balance 0% 0%
2.5.2.5 Configuration of Handover Parameters
Inter-frequency handoversinternal
Table 2-12 Parameter Configuration for Inter-Frequency HandoversInternal (Strategy4)
Category Service Type Event Name Parameter Name Value
Internal CS2D THRESHUSEDFREQ 95
2D\2F HYSTERESIS 4
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Category Service Type Event Name Parameter Name Value
2D\2F TimetoTrigger 640 ms
2F THRESHUSEDFREQ 90
PS
2D THRESHUSEDFREQ 115
2D\2F HYSTERESIS 4
2D\2F TimetoTrigger 640 ms
2F THRESHUSEDFREQ 102
Inter-frequency handoversborder
Table 2-13 Parameter Configuration for Inter-Frequency HandoversBorder (Strategy4)
Category Service Type Event Name Parameter Name Value
Border
CS
2D THRESHUSEDFREQ 90
2D\2F HYSTERESIS 4
2D\2F TimetoTrigger 640 ms
2F THRESHUSEDFREQ 87
PS
2D THRESHUSEDFREQ 115
2D\2F HYSTERESIS 4
2D\2F TimetoTrigger 640 ms
2F THRESHUSEDFREQ 102
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3 Triple-Carrier Networking Strategies
3.1 General Care
Because the UE will read the broadcast message after the PS service changes from
DCH state to FACH state, once the CELL BAR scheme is adopted for the cell, the
UE will perform inter-frequency cell reselection. This process may lead to PS call
drops. Therefore, when the field engineers construct multi-carrier networks, if the
CELL FACH state is activated, it is prohibited to adopt the CELL BAR scheme.
This chapter provides two triple-carrier networking strategies commonly used in
China and overseas. If the field engineers put forward other networkingsuggestions, please contact the author of this document for further discussion.
Considering the impact on the RRC and RAB connection setup success rates, the
field engineers can consider disabling the service-and-load balance strategy during
the RRC and RAB connection setup procedures and just enabling the
service-and-load balance strategy during the call holding procedure. This solution is
similar to the current RAB-based service-and-traffic balance and is mainly used in
the following scenarios:
Relocation for service from another RNC via the Iur interface
Handover
Call re-setup flow triggered by the CELL UPDATEmessage
Change from non-DCH state to DCH state
Table 3-1 lists the parameter settings to balance the service and load during the call
holding procedure.
Table 3-1 Parameter Settings to Balance the Service and Load During the Call HoldingProcedure
Balance Parameter F1 F2 F3
Service Balance Switch of Call HoldingProcedure
On On On
Preferred Service TypeCSPreferred
PSPreferred
PSPreferred
Load Balance Switch of Call HoldingProcedure
On On On
UTRAN Downlink Load BalanceThreshold (Power)
55% 55% 55%
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Balance Parameter F1 F2 F3
Permitted Payload Difference DownlinkLoad Threshold in Inter-Frequency Cells(Power)
10% 10% 10%
Downlink Power Weight for LoadBalance
100% 100% 100%
3.2 Strategy 1: F1-R99+HSPA; F2-R99+HSPA;F3-R99+HSPA
To make best use of the operators carrier resources, we recommend setting
triple-carriers to full service supported and letting idle UEs choose the origination carriers
through free selection.
And the following configuration modes can be considered:
Three UMTS2100 carriers
Two UMTS2100 carriers and one UMTS900 carrier
One UMTS2100 carrier and two UMTS900 carriers
Three UMTS900 carriers
Figure 3-1 Triple-Carrier Networking Strategy 1
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3.2.1 Relevant Strategies
3.2.1.1 Selection Strategy
The idle UE performs cell selection and reselection according to the Ec/No values of
the signals.
3.2.1.2 Move-Based Strategy
When the UE moves inside a multi-carrier area, it will only perform intra-frequency
handovers.
On a border between two multi-carrier areas, when the UE moves out of the
coverage area of F2 or F3 (see Figure 3-1), it will perform F2-to-F1 or F3-to-F1inter-frequency handovers. When the UE moves inside the coverage area of F1, it
will only perform intra-frequency handovers. F1-to-F2 and F1-to-F3 handovers
based on UE moves (network coverage) are not configured.
3.2.1.3 Balance Strategy
The idle UE performs cell selection and reselection according to the Ec/No values of
the signals.
F1, F2, and F3 cells all bear CS and PS service, that is, they are all configured asCS+PS Preferred.
All the balance switches of F1, F2, and F3 cells are turned off.
The UE initiates service on the residence carrier.
3.2.2 Configuration of Radio Parameters
3.2.2.1 Cell Configuration
F1: R99+HSPA; CPICH 33 dBm
F2: R99+HSPA; CPICH 33 dBm
F3: R99+HSPA; CPICH 33 dBm
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3.2.2.2 Configuration of Inter-Frequency Neighbor Cells
For co-sited and co-sector F1, F2, and F3 cells, they should be mutually configured
as neighbor cells for reselection of idle UEs.
For F2 and F3 border cells, the surrounding F1 cells should be configured as their
neighbor cells for inter-frequency handovers.
3.2.2.3 Configuration of Inter-RAT Neighbor Cells
GSM cells should be configured as inter-RAT neighbor cells of F1, F2, and F3 cells.
Copy the inter-RAT GSM neighbor cells of F1 cells as those of F2 and F3 cells.
3.2.2.4 Configuration of Balance and Reselection Parameters
Table 3-2 Balance and Reselection Parameter Configuration (Strategy 1)
Selection or Reselection Parameter F1 F2 F3
Measurement Quantity for Cell Selectionand Reselection
CPICHEc/No
CPICHEc/No
CPICHEc/No
Sintersearch Configuration Tag False False False
Qhyst2s 2 dB 2 dB 2 dB
Bar Off Off OffBalance Parameter F1 F2 F3
Measurement Quantity for FrequencyQuality Estimate
CPICHRSCP
CPICHRSCP
CPICHRSCP
Threshold Used Frequency (Event 2D) 105 dBm 105 dBm 105 dBm
Threshold Used Frequency (Event 2F) 102 dBm 102 dBm 102 dBm
Hysteresis (Event 2A) 4 dB 4 dB 4 dB
Service Balance Switch of Initial RRCProcedure
Off Off Off
Service Balance Switch of RAB
Assignment Procedure
Off Off Off
Preferred Service TypeCS+PSPreferred
CS+PSPreferred
CS+PSPreferred
Load Balance Switch for DownlinkPower
Off Off Off
Load Balance Switch for Code Off Off Off
Load Balance Switch for UplinkInterference
Off Off Off
Load Balance Switch of Initial RRCProcedure
Off Off Off
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Load Balance Switch of RABAssignment Procedure
Off Off Off
Load Balance Switch of Call HoldingProcedure
Off Off Off
UTRAN Downlink Load BalanceThreshold (Power)
55% 55% 55%
UTRAN Downlink Load BalanceThreshold (Code)
50% 50% 50%
Permitted Payload Difference DownlinkLoad Threshold in Inter-Frequency Cells(Power)
10% 10% 10%
Permitted Payload Difference DownlinkLoad Threshold in Inter-Frequency Cells(Code)
10% 10% 10%
Downlink Power Weight for LoadBalance 100% 100% 100%
Uplink Interference Weight for LoadBalance
0% 0% 0%
3.2.2.5 Configuration of Handover Parameters
Inter-frequency handoversinternal
Table 3-3 Parameter Configuration for Inter-Frequency HandoversInternal (Strategy
1)
Category Service Type Event Name Parameter Name Value
Internal
CS
2D THRESHUSEDFREQ 95
2D\2F HYSTERESIS 4
2D\2F TimetoTrigger 640 ms
2F THRESHUSEDFREQ 90
PS
2D THRESHUSEDFREQ 115
2D\2F HYSTERESIS 4
2D\2F TimetoTrigger 640 ms
2F THRESHUSEDFREQ 90
Inter-frequency handoversborder
Table 3-4 Parameter Configuration for Inter-Frequency HandoversBorder (Strategy1)
Category Service Type Event Name Parameter Name Value
Border CS
2D THRESHUSEDFREQ 90
2D\2F HYSTERESIS 4
2D\2F TimetoTrigger 640 ms
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Category Service Type Event Name Parameter Name Value
2F THRESHUSEDFREQ 87
PS
2D THRESHUSEDFREQ 115
2D\2F HYSTERESIS 4
2D\2F TimetoTrigger 640 ms
2F THRESHUSEDFREQ 102
3.3 Strategy2: F1-R99; F2-HSPA; F3-HSPA
If HSPA and R99 service is mixed on a carrier, it will cause Ec/Io fluctuations to the cell,
that is, the inhalation and exhalation effects of the cell will become obvious gradually. To
ensure the R99 users especially the CS service users good service experience, the
engineers can separately assign R99 service to a UARFCN (for example, F1 in Figure3-2), so as to avoid the impact of HSPA service on CS service.
And the following configuration modes can be considered:
Three UMTS2100 carriers
Two UMTS2100 carriers and one UMTS900 carrier
One UMTS2100 carrier and two UMTS900 carriers
Three UMTS900 carriers
Figure 3-2 Triple-Carrier Networking Strategy 2
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3.3.1 Relevant Strategies
3.3.1.1 Selection Strategy
Set cell reselection parameters to let the idle UE reside on an F1 cell.
Do not let the UE reside on any F2 or F3 cell.
3.3.1.2 Move-Based Strategy
When the UE moves inside a multi-carrier area, intra-frequency soft handovers are
preferred. Inter-frequency service balance is only performed from F1 cells to F2
cells.
On a border between two multi-carrier areas, when the UE moves out of the
coverage area of F2, it will perform F2-to-F1 inter-frequency handovers.
3.3.1.3 Balance Strategy
Enable service balance during the RRC and RAB connection setup procedures.
Enable load balance based on DL power for F1 cells.
When the UE initiates R99 CS service, the service will be preferable set up on an F1
cell.
When the UE initiates R99 PS service, the service will be shifted from an F1 cell to
an F2 or F3 cell (light-traffic) through service balance in the RRC connection setup
procedure.
When the UE initiates HSPA service, the service will be shifted to an F2 or F3 cell
(light-traffic) and accessed through service balance or UE capacity balance in the
RRC connection setup procedure.
For concurrent CS and PS service (the CS service taking place first and then the PS
service), the R99 PS service will be carried on an F1 cell.
For concurrent PS and CS service (the PS service taking place first and then the CS
service), the CS service will be carried on an F2 cell.
When the UE in a single-carrier area initiates HS service and moves toward the
border of a dual-carrier area, if the local R99 cell is not configured with a
co-coverage and inter-frequency HS neighbor cell, there will be a co-frequency hard
handover; if the local cell is configured with a co-coverage and inter-frequency HS
neighbor cell, the service will be handed over to the co-coverage and
inter-frequency HS neighbor cell.
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3.3.2 Configuration of Radio Parameters
3.3.2.1 Cell Configuration
F1: R99; CPICH 33 dBm
F2: HSPA; CPICH 33 dBm
F3: HSPA; CPICH 33 dBm
3.3.2.2 Configuration of Inter-Frequency Neighbor Cells
The F2 cells co-sited with F1 cells should be configured as the co-coverage and
inter-frequency neighbor cells of F1 cells.
For F2 border cells, the surrounding F1 cells should be configured as their
inter-frequency neighbor cells.
3.3.2.3 Configuration of Inter-RAT Neighbor Cells
Only F1 cells can be configured as neighbor cells of GSM cells.
GSM cells should be configured as inter-RAT neighbor cells of both F1 and F2 cells.
Copy the inter-RAT GSM neighbor cells of F1 cells as those of F2 cells.
3.3.2.4 Configuration of Balance and Reselection Parameters
Table 3-5 Balance and Reselection Parameter Configuration (Strategy 2)
Selection or Reselection Parameter F1 F2 F3
Measurement Quantity for CellSelection and Reselection
CPICH Ec/NoCPICHEc/No
CPICHEc/No
Sintersearch Configuration Tag True False FalseSintersearch - - -
Qhyst1s - - -
Qhyst2s 2 dB 2 dB 2 dB
Qoffset1s,n in SIB11 - - -
Qoffset2s,n in SIB11 50 dB 50 dB 50 dB
Bar Off Off Off
Balance Parameter F1 F2 F3
Measurement Quantity for FrequencyQuality Estimate
CPICH RSCPCPICHRSCP
CPICHRSCP
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4 Case Study
This chapter takes a dual-carrier site in a domestic service zone as an example and
compares the service connection setup success rates, RRC connection setup success
rates, and RAB connection setup success rates of this site on the OMC respectively in
the following three scenarios:
1. The free selection mode is used for idle UEs.
2. Service balance is enabled during both the RRC and RAB connection setup
procedures.
3. Service balance is enabled during the RRC connection setup procedure only.
4.1 Reselection of Idle UEs
Analysis of the OMC statistics on idle UEs in free selection mode shows that the relevant
average service connection success rate, RRC connection setup success rates, and
RAB connection setup success rates all exceeded 99.7%.
Figure 4-1 OMC Statistics on Connection Success Rates of Idle UEs in Free SelectionMode
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4.2 Service Balance Enabled in Both the RRC andRAB Connection Setup Procedures
Analysis of the OMC statistics on the dual-carrier network with service balance enabled inboth the RRC and RAB connection setup procedures shows that except the PS
success rate, which exceeded 99.7%, other indicators were all between 99.4% and
99.7%.
Figure 4-2 OMC Statistics on Connection Success Rates When Service Balance WasEnabled in Both the RRC and RAB Connection Setup Procedures
4.3 Service Balance Enabled in the RRC ConnectionSetup Procedure Only
Analysis of the OMC statistics on the dual-carrier network with service balance enabled in
the RRC connection setup procedure shows that except the PS connection setupsuccess rate, which exceeded 99.7%, other indicators were all between 99.5% and
99.7%.
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Figure 4-3 OMC Statistics on Connection Success Rates When Service Balance WasEnabled in the RRC Connection Setup Procedure Only
4.4 Comparison Result
The above comparative analysis shows that the free balance mode of idle UEs has a
conspicuous advantage in terms of OMC indicator statistics.
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5 Conclusion
With a sharp increase of UMTS network subscribers both in China and overseas, it is
required to add dual-carrier networks constantly. To make best use of the carrier
resources, currently we recommend Strategy 1. However, the field engineers can choose
a multi-carrier network strategy according to the actual conditions and then optimize the
configuration of parameters and neighbor cells accordingly in future.
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AppA GlossaryAcronym Full Name
DCH Dedicated Channel
FACH Forward Access Channel
HSPA High-Speed Packet Access
PS Packet Switched
RAB Radio Access Bearer
RAT Radio Access Technology
RRC Radio Resource Control
UARFCN UTRAN Absolute Radio Frequency Channel Number
UE User Equipment