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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UMTS Commercial Multi-Carrier Networking Guide Internal Use Only

ZTE Confidential Proprietary 2013 ZTE CORPORATION. All rights reserved. I

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ZTE Confidential Proprietary 2013 ZTE CORPORATION. All rights reserved. II

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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ZTE Confidential Proprietary 2013 ZTE CORPORATION. All rights reserved. IV

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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ZTE Confidential Proprietary 2013 ZTE CORPORATION. All rights reserved. V

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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ZTE Confidential Proprietary 2013 ZTE CORPORATION. All rights reserved. VI

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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ZTE Confidential Proprietary 2013 ZTE CORPORATION. All rights reserved. VII

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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ZTE Confidential Proprietary 2013 ZTE CORPORATION. All rights reserved. 1

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 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


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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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


55% 55%

UTRAN Downlink Load Balance Threshold

(Code) 50% 50%


10% 10%

Permitted Payload Difference Downlink LoadThreshold in Inter-Frequency Cells (Code)

10% 10%


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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2F THRESHUSEDFREQ 90

PS


2D\2F HYSTERESIS 4



Inter-frequency handoversborder

Table 2-4 Parameter Configuration for Inter-Frequency HandoversBorder (Strategy1)


Border

CS

2D THRESHUSEDFREQ 902D\2F HYSTERESIS 4



PS


2D\2F HYSTERESIS 4



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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Set cell reselection parameters to let the idle UE reside on an F1 cell.

Do not let the UE reside on any F2 cell.


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.


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.



F1: R99; CPICH 33 dBm



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.


Only F1 cells can be configured as neighbor cells of GSM cells.




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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




On Off


On Off

Service Balance Switch of Call HoldingProcedure

Off Off


Load Balance Switch for Downlink Power On Off

Load Balance Switch for Code Off Off

Load Balance Switch for Uplink Interference Off Off


On forinter-frequencyload balance only

Off



Off


Off Off


55% 55%

UTRAN Downlink Load Balance Threshold(Code)

50% 50%


10% 10%


10% 10%





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Internal

CS


2D\2F HYSTERESIS 4



PS


2D\2F HYSTERESIS 42D\2F TimetoTrigger 640 ms





Border

CS


2D\2F HYSTERESIS 4



PS


2D\2F HYSTERESIS 4



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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handovers. Inter-frequency operations can only be F1-to-F2 operations triggered by

service balance.


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.




When the UE initiates R99 service, the service will be preferable set up on an F1

cell.


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On Off


On Off


Off Off







Off



Off


OffOff


55% 55%

UTRAN Downlink Load Balance Threshold

(Code)

50% 50%


10% 10%


10% 10%








Internal CS


2D\2F HYSTERESIS 4



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PS


2D\2F HYSTERESIS 4






Border

CS

2D THRESHUSEDFREQ 902D\2F HYSTERESIS 4



PS


2D\2F HYSTERESIS 4



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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handovers. Inter-frequency operations can only be F1-to-F2 operations triggered by

service balance


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.





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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.




F2: HSPA; CPICH 33 dBm



inter-frequency neighbor cells of F1 cells; vice versa.












Sintersearch Configuration Tag True False


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Sintersearch 10 dB 0 dB

Qhyst1s 10 dB 10 dB

Qhyst2s 2 dB 2 dB





On Off


On Off







Off



Off


Off Off


55% 55%

UTRAN Downlink Load Balance Threshold(Code)

50% 50%


10% 10%


10% 10%








Internal CS2D THRESHUSEDFREQ 95

2D\2F HYSTERESIS 4


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PS


2D\2F HYSTERESIS 4






Border

CS


2D\2F HYSTERESIS 4



PS


2D\2F HYSTERESIS 4




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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


On On On

Preferred Service TypeCSPreferred

PSPreferred

PSPreferred


On On On

UTRAN Downlink Load BalanceThreshold (Power)

55% 55% 55%


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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


Figure 3-1 Triple-Carrier Networking Strategy 1


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the signals.



handovers.


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.



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.







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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.


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.



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


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


Off Off Off


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Load Balance Switch of RABAssignment Procedure

Off Off Off


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%



Table 3-3 Parameter Configuration for Inter-Frequency HandoversInternal (Strategy

1)


Internal

CS


2D\2F HYSTERESIS 4



PS


2D\2F HYSTERESIS 4






Border CS


2D\2F HYSTERESIS 4



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PS


2D\2F HYSTERESIS 4



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:


Two UMTS2100 carriers and one UMTS900 carrier

One UMTS2100 carrier and two UMTS900 carriers


Figure 3-2 Triple-Carrier Networking Strategy 2


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Do not let the UE reside on any F2 or F3 cell.


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.


coverage area of F2, it will perform F2-to-F1 inter-frequency handovers.




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.


34/41










inter-frequency neighbor cells of F1 cells.









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


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

umts rno subject-commercial multi-carrier networking guide_r1.0.docx

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