CSFB QoS(GBSS17.1_01)

GSM BSS GBSS17.1

CSFB QoS Feature Parameter Description Issue

01

Date

2015-04-20

HUAWEI TECHNOLOGIES CO., LTD.

Copyright © Huawei Technologies Co., Ltd. 2017. All rights reserved. No part of this document may be reproduced or transmitted in any form or by any means without prior written consent of Huawei Technologies Co., Ltd.

Trademarks and Permissions and other Huawei trademarks are trademarks of Huawei Technologies Co., Ltd. All other trademarks trademarks and trade names mentioned mentioned in this this document are are the property of of their respective holders.

Notice The purchased products, services and features are stipulated by the contract made between Huawei and the customer. customer. All or part of the products, services and features described in this document may not be within the purchase scope or the usage scope. Unless otherwise specified in the contract, all statements, information, information, and recommendations in this document are provided "AS IS" without warranties, guarantees or representations representations of any kind, either express or implied. The information in this document is subject to change without notice. Every effort has been made in the preparation of this document to ensure accuracy of the contents, but all statements, information, and recommendations recommendations in this document do not constitute a warranty of any kind, express or implied.

Huawei Technologies Co., Ltd. Address:

Huawei Industrial Industrial Base Bantian, Longgang Shenzhen 518129 People's Republic of China

Website:

http://www.huawei.com

Email:

[email protected]

Issue 01 (2015-04-20)

Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

i

Copyright © Huawei Technologies Co., Ltd. 2017. All rights reserved. No part of this document may be reproduced or transmitted in any form or by any means without prior written consent of Huawei Technologies Co., Ltd.

Trademarks and Permissions and other Huawei trademarks are trademarks of Huawei Technologies Co., Ltd. All other trademarks trademarks and trade names mentioned mentioned in this this document are are the property of of their respective holders.

Notice The purchased products, services and features are stipulated by the contract made between Huawei and the customer. customer. All or part of the products, services and features described in this document may not be within the purchase scope or the usage scope. Unless otherwise specified in the contract, all statements, information, information, and recommendations in this document are provided "AS IS" without warranties, guarantees or representations representations of any kind, either express or implied. The information in this document is subject to change without notice. Every effort has been made in the preparation of this document to ensure accuracy of the contents, but all statements, information, and recommendations recommendations in this document do not constitute a warranty of any kind, express or implied.

Huawei Technologies Co., Ltd. Address:

Huawei Industrial Industrial Base Bantian, Longgang Shenzhen 518129 People's Republic of China

Website:

http://www.huawei.com

Email:

[email protected]

Issue 01 (2015-04-20)


i

GSM BSS CSFB QoS Feature Parameter Description

Contents

Contents 1 About This This Document........... Document................................. ............................................ ............................................. ............................................. .................................... .............. 1 1.1 Scope........................................................................................................... Scope....... ....................................................................................................................................................................... ................................................................... 1 1.2 Intended Audience..........................................................................................................................................................1 1.3 Change History................................................................................................... H istory............................................................................................................................................................... ............................................................ 1

2 Overview........... Overview................................. ............................................ ............................................ ............................................. ............................................. ..................................... ............... 3 2.1 Introduction................................................................................ Introduction.................................................................................................................................................................... .................................................................................... 4 2.2 Benefits........................................................................................................................................................................... Benefits........................................................................................................................................................................... 4 2.3 NEs Supporting Supporting the Feature............................................................................................................................................5

3 Technical Description........ Description.............................. ............................................ ............................................. ............................................. ........................................6 ..................6 3.1 Overview.................................................................. Overview........................................................................................................................................................................ ...................................................................................................... 6 3.2 Very-Early Very-Early TCH Assignment Based on CSFB Call Identification.................................................................................6 3.3 CSFB Voice Voi ce Quality Assurance......................................................................................................................................6 3.3.1 CSFB Preemption P reemption and Queuing................................................................................. Queuing.................................................................................................................................. ................................................. 7 3.3.2 Full-Rate Full-Rate Channel Preferred for CSFB Calls.............................................................................................................. Calls.............................................................................................................. 7 3.3.3 CSFB VAMOS VAMOS Prohibition....................................................................................................... Prohibition..........................................................................................................................................8 ...................................8

4 Related Features........ Features.............................. ............................................ ............................................. ............................................. ............................................ ............................ ......9 9 5 Network Impact........... Impact.................................. ............................................. ............................................ ............................................ ............................................ ........................ 10 5.1 System Capacity............................................................................................................................... Capacity........................................................................................................................................................... ............................ 10 5.2 Network Performance...................................................................................................................................................10 P erformance...................................................................................................................................................10

6 Engineering Guidelines............ Guidelines.................................. ............................................ ............................................ ............................................ ............................... ......... 12 6.1 When to Use CSFB Qos............................................................................................................................................... Qos............................................................................................................................................... 12 6.2 Required Information................................................................................................. Information................................................................................................................................................... .................................................. 12 6.3 Planning............................................................................................... Planning........................................................................................................................................................................ ......................................................................... 12 6.4 Deploying CSFB Deploying CSFB Qos............................................................................................................................................ Qos................................................................................................................................................... ....... 12 6.4.1 Deployment Deployment Requirements.......................................................................................... Requirements........................................................................................................................................ .............................................. 13 6.4.2 Activation................................................................................. Activati on.................................................................................................................................................................. ................................................................................. 13 6.4.3 Activation Activati on Observation.............................................................................................................................................. Observation..............................................................................................................................................15 15 6.4.4 Deactivation............................................................................................................................................................... Deactivation...............................................................................................................................................................17 17 6.5 Performance Monitoring.......................................................................................... Monitoring...............................................................................................................................................18 .....................................................18 6.6 Parameter Optimization................................................................................................................................................ Optimization................................................................................................................................................ 20 6.7 Troubleshooting............................................................................................................................................................ Troubleshooting............................................................................................................................................................ 20 Issue 01 (2015-04-20)


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Contents

7 Parameters.....................................................................................................................................21 8 Counters........................................................................................................................................ 27 9 Glossary.........................................................................................................................................29 10 Reference Documents............................................................................................................... 30

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1 About This Document

1

About This Document

1.1 Scope This document describes GBFD-160203 CSFB QoS, including its technical principles, related features, network impact, and engineering guidelines.

1.2 Intended Audience This document is intended for personnel who: l l

Need to understand the features described herein Work with Huawei products

1.3 Change History This section provides information about the changes in different document versions. There are two types of changes: l

Feature change Changes in features of a specific product version

l

Editorial change Changes in wording or addition of information that was not described in the earlier version

01 (2015-04-20) This issue does not include any changes.

Draft A (2015-01-15) Compared with Issue 01 (2014-04-30) of GBSS16.0, Draft A (2015-01-15) of GBSS17.1 includes the following changes.

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1 About This Document

Change Type

Change Description

Parameter Change

Feature change

Added descriptions about the GBFD-171212 UltraFlash CSFB feature. Revised the following parts:

None

2.1 Introduction Prerequisite Features 6.4 Deploying CSFB Qos

Editorial change

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None

None


2


2 Overview

2

Overview

All MSs involved in this document are GSM/LTE dual-mode or multi-mode MSs. This document applies to LTE FDD and LTE TDD. Any "LTE" in this document refers to LTE FDD and LTE TDD.

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2 Overview

2.1 Introduction This document defines the following CSFB calls: l

Common CSFB calls: refer to the calls using the GBFD-511313 CSFB feature.

l

Ultra-Flash CSFB calls: refer to the calls using the GBFD-171212 Ultra-Flash CSFB feature.

The CSFB QoS feature includes the very-early TCH assignment based on CSFB call identification function and the CSFB voice quality assurance function. l

Very-early TCH assignment based on CSFB call identification The setup delay of CSFB calls is longer than that of common calls, which affects user experience. To decrease the CSFB call setup delay, the very-early TCH assignment based on CSFB call identification function is introduced. This function enables the BSC to perform very-early TCH assignment for the CSFB calls identified by CSFB call identification.

l

CSFB voice quality assurance This function includes the following sub functions: –

CSFB preemption and queuing During the initial access of a CSFB call, the CSFB call takes precedence over common calls. If no channels are available, the CSFB call can preempt channels occupied by lower-priority calls or non-CSFB calls with the same priority as the CSFB call. If the preemption fails, the CSFB call joins a queue.

–

Full-rate channel preferred for CSFB calls The BSC preferentially allocates TCHFs to CSFB calls.

–

CSFB VAMOS prohibition CSFB calls cannot serve as candidate VAMOS calls. NOTE

TCH is short for traffic channel. TCHF is short for full-rate traffic channel. TCHH is short for half-rate traffic channel. CSFB is short for circuit switched fallback. VAMOS is short for voice services over adaptive multi-user channels on one slot.

2.2 Benefits The CSFB QoS feature provides the following benefits: l

The very-early TCH assignment based on CSFB call identification function helps decrease the delay in the establishment of a CSFB mobile originated call (MOC) or CSFB mobile terminated call (MTC) by 1s to 1.5s.

l

The CSFB preemption and queuing function helps increase the assignment success rate of CSFB calls when TCHs are congested.

l

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The full-rate channel preferred for CSFB calls function and the CSFB VAMOS prohibition function help improve the voice quality of CSFB calls. Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

4


2 Overview

2.3 NEs Supporting the Feature Table 2-1 NEs supporting the feature

Feature

BSC6900

BSC6910

GBTS

eGBTS

CSFB QoS

√

√

√

√

NOTE

indicates that the NE supports this feature. × indicates that the NE does not support this feature.

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3 Technical Description

3

Technical Description

3.1 Overview The CSFB QoS feature includes t he following functions: very-early TCH assignment based on CSFB call identification, CSFB preemption and queuing, full-rate channel preferred for CSFB calls, and CSFB VAMOS prohibition. If all of these functions are enabled and the veryearly TCH assignment based on CSFB call identification function is triggered, then: l

l

Neither the CSFB preemption and queuing function nor the full-rate channel preferred for CSFB calls function takes effect for the call. During the very-early TCH assignment, the CSFB VAMOS prohibition function does not take effect for the call. After the very-early TCH assignment is complete, this function takes effect for the call.

3.2 Very-Early TCH Assignment Based on CSFB Call Identification When CSFBIMMASSENSW( BSC6900 , BSC6910 ) is set to ON(On) and the current cell load BSC6900 , BSC6910 ), the BSC performs veryis less than the value of ImmTchLoadThres( early TCH assignment for the following CSFB calls: l

CSFB mobile originated calls (MOCs) identified by the CSFB MOC identification function

l

CSFB mobile terminated calls (MTCs) identified by the CSFB MTC identification function

The very-early TCH assignment procedure for CSFB calls is similar to that for common calls on GSM networks. For details, see Assignment and Immediate Assignment Feature Parameter Description.

3.3 CSFB Voice Quality Assurance The CSFB voice quality assurance function includes the following sub functions:

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GSM BSS CSFB QoS Feature Parameter Description l

CSFB preemption and queuing

l

Full-rate channel preferred for CSFB calls

l

CSFB VAMOS prohibition


3.3.1 CSFB Preemption and Queuing During the initial access of a CSFB call, the CSFB call takes precedence over common calls. The CSFB call can preempt channels or join a queue if no channels are available. The CSFB preemption and queuing principles are similar to the eMLPP principles. The differences lie in the following aspects: l

Preemption policy for calls with the same priority as a new call eMLPP allows a new call to only preempt lower-priority calls but not t o preempt channels occupied by calls with the same priority as the new call. However, CSFB preemption and queuing allows a CSFB call to preempt channels occupied by both lower-priority calls and non-CSFB calls with the same priority as the CSFB call.

l

Preemption policy when the message sent by the CN does not contain the priority of a call If the message sent by the CN does not contain the priority of a call, eMLPP does not allow the call to preempt channels. However, CSFB preemption and queuing allows a CSFB call to preempt channels even if the message sent by the CN does not contain the priority of the CSFB call.

l

Method of processing preempted calls – –

l

If a handover for the preempted call fails, eMLPP only allows the BSC to drop the preempted call. However, if a handover for the preempted call fails, CSFB preemption and queuing allows the BSC to cancel the preemption to prevent call drops.

Queuing processing –

If a call fails to preempt channels, when enabled with eMLPP, the BSC determines whether to allow the call to join a queue based on the value of BSCQAD( BSC6900 , BSC6910 ) and instructions from the CN.

–

With CSFB preemption and queuing, if a CSFB call fails to preempt channels, the BSC allows the CSFB call to join a queue regardless of the value of BSCQAD( BSC6900 , BSC6910 ) and instructions from the CN. During the queuing, the CSFB call takes the same priority as common calls.

For details about eMLPP principles, see eMLPP Feature Parameter Description . When both the GBFD-115001 Enhanced Multi Level Precedence and Preemption (EMLPP) feature and the CSFB preemption and queuing function are enabled, non-CSFB calls preempt channels according to eMLPP principles, and CSFB calls preempt channels according to CSFB preemption and queuing principles.

3.3.2 Full-Rate Channel Preferred for CSFB Calls When CSFBOPTIFREN(CSFB FR Optimization Enable) is selected for CSFBVOQULENSURSW( BSC6900 , BSC6910 ), the full-rate channel preferred for CSFB calls function is enabled. In this situation, the BSC preferentially allocates TCHFs to CSFB calls without considering the value of TCHBUSYTHRES( BSC6900 , BSC6910 ) and prohibits TCHF-to-TCHH handovers in a cell. Issue 01 (2015-04-20)


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3.3.3 CSFB VAMOS Prohibition When CSFBNOUSEVAMOS(CSFB VAMOS Pairing Prohibit) is selected for CSFBVOQULENSURSW( BSC6900 , BSC6910 ), the CSFB VAMOS prohibition function is enabled. In this situation, the BSC does not select CSFB calls as candidate VAMOS calls for channel multiplexing.

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4 Related Features

4

Related Features

Prerequisite Features Feature ID

Feature Name

Description

GBFD-511313

CSFB

l

l

GBFD-171212

Ultra-Flash CSFB

The CSFB QoS feature requires the GBFD-511313 CSFB or GBFD-171212 Ultra-Flash CSFB feature. The very-early TCH assignment based on CSFB call identification function in the CSFB QoS feature requires the CSFB MOC identification and CSFB MTC identification functions provided by the GBFD-511313 CSFB feature.

The CSFB QoS feature requires the GBFD-511313 CSFB or GBFD-171212 Ultra-Flash CSFB feature.

Mutually Exclusive Features None

Impacted Features None

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5 Network Impact

5

Network Impact

5.1 System Capacity After the full-rate channel preferred for CSFB calls function is enabled, the proportion of TCHFs increases, thereby decreasing system capacity and increasing cell congestion. After the CSFB VAMOS prohibition function is enabled, the VAMOS channel multiplexing proportion decreases, thereby decreasing capacity gains delivered by VAMOS.

5.2 Network Performance The functions included in the CSFB QoS feature differently impact network performance.

Very-Early TCH Assignment Based on CSFB Call Identification l

Due to the high transmission rate over TCHs, the connections between MSs and the radio network can be quickly established. Decreases the delay in the establishment of a CSFB MOC or CSFB MTC by 1s to 1.5s.

l

Increases the TCH congestion rate. The very-early TCH assignment for CSFB calls causes more TCHs to be occupied on the network. If the proportion of CSFB MSs on the network is 10% and the cell load is greater than 60%, this function increases the TCH congestion rate by 0.3 –0.5%.

l

Slightly decreases the high quality indicator (HQI). If TCHs use a tighter frequency reuse pattern than SDCCHs, the HQI decreases by 0.1 –0.3%.

CSFB Preemption and Queuing l

Increases the assignment success rate and handover success rate of CSFB calls. The increase value is associated with the TCH congestion rate. If the TCH congestion rate is 2%, the assignment success rate of CSFB calls increases by 0.5 –1%.

l

Increases the call drop rate due to traffic congestion by 0.1% or less.

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5 Network Impact

Full-Rate Channel Preferred for CSFB Calls l

Improves voice quality of CSFB calls. The MOS increases by 0.2 to 0.3 for the CSFB MSs that are allocated TCHHs before this function is enabled and allocated TCHFs after this function is enabled.

l

Increases the TCH congestion rate in congested cells. The increase value is strongly associated with the cell traffic model and proportion of CSFB MSs in cells. The increase in TCH congestion rate brought by enabling this function is the same as that brought by increasing the value of TCHBUSYTHRES by proportion of CSFB calls.

l

Slightly decreases the HQI. If the proportion of CSFB calls is less than or equal to 15%, the HQI (proportion of receive quality bands 0 to 4) decreases by 0.3%, and the call drop rate increases by 0.1% or less.

CSFB VAMOS Prohibition l

Improves voice quality of CSFB calls. The MOS increases by 0.2 to 0.4 for the CSFB MSs for which VAMOS channel multiplexing is performed before this function is enabled and is not performed after this function is enabled.

l

Increases the TCH congestion rate in congested cells. The increase value is associated with the proportion of VAMOS MSs, proportion of CSFB MSs, and cell traffic model. The increase in TCH congestion rate brought by enabling this function is the same as that brought by increasing the value of TCHBUSYTHRES by (Proportion of VAMOS MS x Proportion of CSFB MSs x 2). "2" indicates that two VAMOS calls are multiplexed onto one TCHH or TCHF.

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6 Engineering Guidelines

6

Engineering Guidelines

6.1 When to Use CSFB Qos It is recommended that the very-early TCH assignment based on CSFB call identification function be enabled when the TCH congestion rate is lower than 5% but the access delay of CSFB calls is long. If the proportion of CSFB calls in a cell is less than 15%, you can enable all of the following functions: l


l

Full-rate channel preferred for CSFB calls

l

CSFB VAMOS prohibition

If the proportion of CSFB calls in a cell is greater than or equal to 15%, disable the preceding three functions. You are not advised to enable the full-rate channel preferred for CSFB calls or CSFB VAMOS prohibition function in heavily-loaded or congested cells.

6.2 Required Information Before deploying CSFB QoS, obtain the proportion of CSFB calls, traffic load, and TCH congestion rate in a cell.

6.3 Planning Ensure that the LTE network covers the same area as the GSM network.

6.4 Deploying CSFB Qos

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6.4.1 Deployment Requirements Table 6-1 Deployment requirements

Aspect

Requirement

Related features

See 4 Related Features.

BSC

None

BTS

None

GSM networking

This feature can only be enabled when the LTE network covers the same area as the GSM network.

MS

MSs support GSM and LTE networks and CSFB. Ultra-Flash CSFB MSs using the CSFB voice quality assurance function support SRVCC.

MSC

The MSC supports CSFB.

License

The license controlling this feature has been activated. For details about how to activate the license, see License Management Feature Parameter Description. For details about license items, see License Control Item Description.

Others

l

The SGs interface has been configured between the MSC server and the mobile management entity (MME).

l

Both the access network and CN in the LTE system support CSFB.

l

The RIM procedure is implemented between LTE and GSM networks.

6.4.2 Activation Using MML Commands l

For common CSFB calls

Step 1 On the BSC LMT, run the SET GCELLSOFT command with the following parameters set to appropriate values for the target cell: l

Set CSFB Support to SUPPORT(Support) .

l

Set CSFB MOC Identification Switch to ON(On) .

l

Set CSFB MTC Identification Switch to ON(On).

l

Set CSFB Very Early TCH Assignment Switch to ON(On) if required.

l

Select CSFBPMAQADENC(CSFB Queuing and Preempt Enable) , CSFBOPTIFREN(CSFB FR Optimization Enable), or CSFBNOUSEVAMOS(CSFB VAMOS Pairing Prohibit) for CSFB Voice Quality Ensure Switch based on actual conditions.

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Step 2 (Optional) If CSFB Very Early TCH Assignment Switch is set to ON(On), run the SET GCELLBASICPARA command with Immediate Assignment TCH Load Threshold set to an appropriate value for the target cell. ----End l

For Ultra Flash CSFB calls On the BSC LMT, run the SET GCELLSOFT command with CSFBPMAQADENC(CSFB Queuing and Preempt Enable) , CSFBOPTIFREN(CSFB FR Optimization Enable), or CSFBNOUSEVAMOS(CSFB VAMOS Pairing Prohibit) selected for CSFB Voice Quality Ensure Switch for the target cell based on actual conditions.

MML Command Examples //For common CSFB calls SET GCELLSOFT: IDTYPE=BYID, CELLID=1, SUPPORTCSFB=SUPPORT, CSFBIDENTIFYMOSW=ON, CSFBIDENTIFYMTSW=O N, CSFBIMMASSENSW=ON, CSFBVOQULENSURSW=CSFBPMAQADENC-1&CSFBOPTIFREN-1&CSFBNOUSEVA MOS-1; SET GCELLBASICPARA: IDTYPE=BYID, CELLID=1, ImmTchLoadThres=50; //For Ultra-Flash CSFB calls SET GCELLSOFT: IDTYPE=BYID, CELLID=0, CSFBVOQULENSURSW=CSFBPMAQADENC-1&CSFBOPTIFREN-1&CSFBNOUSEVA MOS-1;

Using the CME NOTE

When configuring the CSFB QoS feature on the CME, perform a single configuration first, and then perform batch modifications if required. Configure the parameters of a single object before a batch modification. Perform a batch modification before logging out of the parameter setting interface.

Step 1 Configure a single object on the CME. (CME single configuration) Set parameters on the CME configuration interface according to the operation sequence described in Table 6-2. For instructions on how to perform the CME single configuration, see CME Single Configuration Operation Guide .

Step 2 (Optional) Modify objects in batches on the CME. (CME batch modification center) ----End

To modify objects (BTS, GSM cell, TRX, BSC, or external GSM cell) in batches, click on the CME to start the batch modification wizard. For instructions on how to perform a batch modification through the CME batch modification center, press F1 on the wizard interface to obtain online help.

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Table 6-2 Configuring parameters on the CME

SN

MO

NE

Parameter Name

Parameter ID

Configura ble in CME Batch Modificati on Center

1

GCELLSOF T

BSC6900/ BSC6910

CSFB Support

SUPPORTC SFB

Yes

CSFB MOC Identificatio n Switch

CSFBIDEN TIFYMOS W

CSFB MTC Identificatio n Switch

CSFBIDEN TIFYMTSW

CSFB Very Early TCH Assignment Switch

CSFBIMM ASSENSW

CSFB Voice Quality Ensure Switch

CSFBVOQ ULENSURS W

Immediate Assignment TCH Load Threshold

ImmTchLoa dThres

2

GCELLBAS ICPARA

BSC6900/ BSC6910

Yes

6.4.3 Activation Observation l

Very-early TCH assignment based on CSFB call identification Observe the counters listed in Table 6-3. If the value of either counter is not 0, the veryearly TCH assignment based on CSFB call identification function has been enabled. Table 6-3 Counters related to very-early TCH assignment based on CSFB call identification

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Counter

Description

CELL.IMM.ASS.CH.ACT.CSFB.M OC

R3309A: Number of Immediate Assignment Channel Activations (Early Identification of CSFB MOC)

CELL.IMM.ASS.CH.ACT.CSFB.M TC

R3309B: Number of Immediate Assignment Channel Activations (Early Identification of CSFB MTC)


15

GSM BSS CSFB QoS Feature Parameter Description l



Observe the counter listed in Table 6-4. If the value of this counter is not 0, the CSFB preemption and queuing function has been enabled. Table 6-4 Counter related to CSFB preemption and queuing

Counter

Description

CELL.PREEMPT.NONCSFB.HO.RE Q

H3102M: Number of Handover Requests of NonCSFB MSs due to CSFB Preemption

l

Full-rate channel preferred for CSFB calls Observe the counter listed in Table 6-5 when TCHs are congested. If the value of this counter increases slightly when traffic volume is held constant, the full-rate channel preferred for CSFB calls function has been enabled. Table 6-5 Counter related to full-rate channel preferred for CSFB calls

l

Counter

Description

CELL.CSFB.CHAN.ALLOC.SUCC.TIMES.T CHF

R3127F: Number of Full-Rate Channel Allocations for CSFB MSs

CSFB VAMOS prohibition Observe the counters listed in Table 6-6. If the value of any counter decreases slightly when traffic volume is held constant, the CSFB VAMOS prohibition function has been enabled. Table 6-6 Counters related to CSFB VAMOS prohibition

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Counter

Description

CELL.VAMOS.ASS.ADJUD

A3100J: Number of Successful VAMOS Candidate Call Decisions (Assignment)

CELL.VAMOS.ASS.TRY

A3100L: Number of VAMOS Channel Multiplexing Attempts (Assignment)

CELL.VAMOS.INTRACELL.HO.ADJ UD

H3050: Number of Successful VAMOS Candidate Call Decisions (Intra-Cell Handover)

CELL.VAMOS.INTRACELL.HO.TRY

H3051: Number of VAMOS Channel Multiplexing Attempts (Intra-Cell Handover)


16



6.4.4 Deactivation Using MML Commands On the BSC LMT, run the SET GCELLSOFT command with the following parameters set to appropriate values for the target cell: l

To disable the very-early TCH assignment based on CSFB call identification function, set CSFB Very Early TCH Assignment Switch to OFF(Off).

l

To disable the CSFB voice quality assurance function, deselect CSFBPMAQADENC(CSFB Queuing and Preempt Enable) , CSFBOPTIFREN(CSFB FR Optimization Enable), or CSFBNOUSEVAMOS(CSFB VAMOS Pairing Prohibit) for CSFB Voice Quality Ensure Switch based on actual conditions.

MML Command Examples SET GCELLSOFT: SUPPORTCSFB=SUPPORT, CSFBIMMASSENSW=OFF, CSFBVOQULENSURSW=CSFBPMAQADENC-0&CSFBOPTIFREN-0&CSFBNOUSEVA MOS-0;

Using the CME NOTE

When configuring the CSFB QoS feature on the CME, you must perform a single configuration first, and then perform batch modifications if required. You must perform a single configuration for a parameter before batch modifications of the parameter. You are advised to perform batch modifications before logging out of the parameter setting interface.

Step 1 Configure a single object on the CME. (CME single configuration) Set parameters on the CME configuration interface according to the operation sequence described in Table 6-7. For the method of performing the CME single configuration, see CME Single Configuration Operation Guide .

Step 2 (Optional) Modify objects in batches on the CME. (CME batch modification center) ----End

To modify objects, such as BSCs, BTSs, cells, and TRXs, in batches, click the icon on the CME configuration interface to start the batch modification wizard. For the method of performing batch modifications through the CME batch modification center, press F1 on the wizard interface to obtain online help.

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Table 6-7 Configuring parameters on the CME

SN

MO

NE

Parameter Name

Parameter ID

Configura ble in CME Batch Modificati on Center

1

GCELLSOF T

BSC6900/ BSC6910

CSFB Support

SUPPORTC SFB

Yes

2

GCELLSOF T

BSC6900/ BSC6910

CSFB Very Early TCH Assignment Switch

CSFBIMM ASSENSW

Yes

3

GCELLSOF T

BSC6900/ BSC6910

CSFB Voice Quality Ensure Switch

CSFBVOQ ULENSURS W

Yes

6.5 Performance Monitoring After the CSFB QoS feature is enabled, monitor the counters listed in Table 6-8. Table 6-8 Counters related to CSFB QoS

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Counter Name

Counter Description

CELL.ESTB.IND.CSMO

A3039A: Number of Call Setup Indications (CSFB MOC)

CELL.ESTB.IND.CSMT

A3039B: Number of Call Setup Indications (CSFB MTC)

CELL.ASS.CMPL.CSMO.TCH

A3170A: Number of Completed TCH Assignments (CSFB MOC)

CELL.ASS.CMPL.CSMT.TCH

A3170B: Number of Completed TCH Assignments (CSFB MTC)

CELL.CH.REQ.CSFB.MOC

A300M: Number of Channel Requests (Early Identification of CSFB MOC)

CELL.CH.REQ.CSFB.MTC

A300N: Number of Channel Requests (Early Identification of CSFB MTC)

CELL.IMM.ASS.CH.ACT.CSFB.MOC

R3309A: Number of Immediate Assignment Channel Activations (Early Identification of CSFB MOC)

CELL.IMM.ASS.CH.ACT.CSFB.MTC

R3309B: Number of Immediate Assignment Channel Activations (Early Identification of CSFB MTC)


18



Counter Name

Counter Description

BSCRPT.RATE.TCH.CONG

ZTR106A: Congestion Rate on TCH per BSC

CELL.KPI.TCH.CONGESTION.RATE

K3045: Congestion Rate on TCH (All Channels Busy)

CELL.PREEMPT.NONCSFB.HO.REQ

H3102M: Number of Handover Requests of Non-CSFB MSs due to CSFB Preemption

CELL.PREEMPT.NONCSFB.HO.SUCC

H3132M: Number of Successful Handovers of Non-CSFB MSs due to CSFB Preemption

CELL.CSFB.CHAN.ALLOC.SUCC.TIMES. TCHF


CELL.RATE.TCH.CALL.DROP.EXCLUDE .HO

ZTR304A: Call Drop Rate on TCH per cell(Excluding Handover)

CELL.RATE.TCH.CALL.DROP.INCLUDE. HO

ZTR304: Call Drop Rate on TCH per cell(including Handover)

CELL.RD.HO.SUCC.RATE

RH303A: Success Rate of Radio Handover

NOTE

Assignment success rate of CSFB calls = [(A3170A: Number of Completed TCH Assignments (CSFB MOC) + A3170B: Number of Completed TCH Assignments (CSFB MTC)]/[A3039A: Number of Call Setup Indications (CSFB MOC) + A3039B: Number of Call Setup Indications (CSFB MTC)]

Monitor the counters listed in Table 6-9 for Ultra-Flash CSFB calls. Table 6-9 Counters related to CSFB QoS for Ultra-Flash CSFB calls

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Counter Name

Counter Description

BSCRPT.RATE.TCH.CONG

ZTR106A: Congestion Rate on TCH per BSC

CELL.KPI.TCH.CONGESTION.RATE

K3045: Congestion Rate on TCH (All Channels Busy)

CELL.PREEMPT.NONCSFB.HO.REQ

H3102M: Number of Handover Requests of Non-CSFB MSs due to CSFB Preemption

CELL.PREEMPT.NONCSFB.HO.SUCC

H3132M: Number of Successful Handovers of Non-CSFB MSs due to CSFB Preemption

CELL.CSFB.CHAN.ALLOC.SUCC.TIMES. TCHF



19



Counter Name

Counter Description

CELL.RATE.TCH.CALL.DROP.EXCLUDE. HO

ZTR304A: Call Drop Rate on TCH per cell(Excluding Handover)

CELL.RATE.TCH.CALL.DROP.INCLUDE. HO

ZTR304: Call Drop Rate on TCH per cell(including Handover)

CELL.RD.HO.SUCC.RATE

RH303A: Success Rate of Radio Handover

6.6 Parameter Optimization If the TCH congestion rate significantly increases after the very-early TCH assignment based on CSFB call identification function is enabled, decrease the value of ImmTchLoadThres( BSC6900 , BSC6910 ). After the CSFB preemption and queuing, full-rate channel preferred for CSFB calls, and CSFB VAMOS prohibition functions are all enabled, if the value of the K3045: Congestion Rate on TCH (All Channels Busy) counter increases by 5% to 10% and the proportion of traffic volume on TCHHs decreases by more than 10%, perform the following optimization: 1.

Disable the full-rate channel preferred for CSFB calls function.

2.

If the TCH congestion rate is still high, disable the CSFB VAMOS prohibition function.

3.

If the value of the RH303A: Success Rate of Radio Handover counter decreases by more than 3%, disable the CSFB preemption and queuing function. NOTE

Proportion of traffic volume on TCHHs = K3034: TCHH Traffic Volume/K3014: Traffic Volume on TCH

6.7 Troubleshooting None

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7 Parameters

7

Parameters

Table 7-1 Parameters

Parame ter ID

NE

MML Feature Comma ID nd

CSFBI MMAS SENSW

BSC690 0

SET GCELL SOFT

GBFD-1 60203

Feature Name

Description

CSFB QoS

Meaning: Whether to enable the TCH very early assignment function for identified CSFB MOCs or CSFB MTCs. When this parameter is set to ON(ON), the BSC performs the TCH very early assignment on identified CSFB MOCs or CSFB MTCs. When this parameter is set to OFF(Off), the BSC does not perform the TCH very early assignment on identified CSFB MOCs or CSFB MTCs. GUI Value Range: OFF(Off), ON(On) Unit: None Actual Value Range: OFF, ON Default Value: OFF(Off)

CSFBI MMAS SENSW

BSC691 0

SET GCELL SOFT

GBFD-1 60203

CSFB QoS

Meaning: Whether to enable the TCH very early assignment function for identified CSFB MOCs or CSFB MTCs. When this parameter is set to ON(ON), the BSC performs the TCH very early assignment on identified CSFB MOCs or CSFB MTCs. When this parameter is set to OFF(Off), the BSC does not perform the TCH very early assignment on identified CSFB MOCs or CSFB MTCs. GUI Value Range: OFF(Off), ON(On) Unit: None Actual Value Range: OFF, ON Default Value: OFF(Off)

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Parame ter ID

NE


ImmTc hLoadT hres

BSC690 0

SET GCELL BASIC PARA

GBFD-1 10502

7 Parameters

Feature Name

Description

Assignm Meaning: TCH load threshold for allowing the BSC to ent and immediately assign a TCH during the TCH immediate Immedia assignment or CSFB TCH very early assignment te procedure. If the TCH load in the serving cell is lower Assignm than this threshold, the BSC is allowed to immediately ent assign a TCH in the cell. If the TCH load in the serving cell is higher than or equal to this threshold, the BSC is not allowed to immediately assign a TCH in the cell. GUI Value Range: 0~100 Unit: % Actual Value Range: 0~100 Default Value: 100

ImmTc hLoadT hres

BSC691 0

SET GCELL BASIC PARA

GBFD-1 10502

Assignm Meaning: TCH load threshold for allowing the BSC to ent and immediately assign a TCH during the TCH immediate Immedia assignment or CSFB TCH very early assignment te procedure. If the TCH load in the serving cell is lower Assignm than this threshold, the BSC is allowed to immediately ent assign a TCH in the cell. If the TCH load in the serving cell is higher than or equal to this threshold, the BSC is not allowed to immediately assign a TCH in the cell. GUI Value Range: 0~100 Unit: % Actual Value Range: 0~100 Default Value: 100

BSCQA D

BSC690 0

SET OTHSO FTPAR A

GBFD-1 15001

Enhance Meaning: Whether to allow services to queue for d Multi resources when radio resources are insufficient. If this Level parameter is set to YES and queuing is allowed on the Precede core network side, services can queue for radio nce and resources. Preempt GUI Value Range: NO(No), YES(Yes) ion (EMLPP Unit: None Actual Value Range: NO, YES ) Default Value: YES(Yes)

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Parame ter ID

NE


BSCQA D

BSC691 0

SET OTHSO FTPAR A

GBFD-1 15001

7 Parameters

Feature Name

Description

Enhance Meaning: Whether to allow services to queue for d Multi resources when radio resources are insufficient. If this Level parameter is set to YES and queuing is allowed on the Precede core network side, services can queue for radio nce and resources. Preempt GUI Value Range: NO(No), YES(Yes) ion (EMLPP Unit: None Actual Value Range: NO, YES ) Default Value: YES(Yes)

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Parame ter ID

NE


CSFBV OQUL ENSUR SW

BSC690 0

SET GCELL SOFT

7 Parameters

Feature Name

Description

GBFD-1 60203

CSFB QoS

Meaning:

GBFD-1 71212

UltraFlash CSFB

Switch for enabling CSFB QoS assurance functions for CSFB and Ultra-Flash CSFB calls. These functions include CSFB preemption and queuing, fullrate channel preferred for CSFB calls, and CSFB VAMOS prohibition. When this parameter is set to CSFBPMAQADENC(CSFB Queuing and Preempt Enable), if a cell becomes congested and has no available channels for a CSFB or Ultra-Flash CSFB call, the call can join a queue or preempt channels occupied by common calls (Common calls refer to calls other than special calls, such as emergency calls, SRVCC calls, and CSFB calls.) that have the same priority as or calls that have lower priorities than this call during an assignment. When this parameter is set to CSFBOPTIFREN(CSFB FR Optimization Enable), the BSC preferentially allocates TCHFs to CSFB and Ultra-Flash CSFB calls during an assignment or intra-BSC handover and prohibits TCHF-to-TCHH handovers after the TCHF allocation. When this parameter is set to CSFBNOUSEVAMOS(CSFB VAMOS Pairing Prohibit), the BSC does not perform VAMOS channel multiplexing on CSFB and Ultra-Flash CSFB calls. GUI Value Range: CSFBPMAQADENC(CSFB Queuing and Preempt Enable), CSFBOPTIFREN(CSFB FR Optimization Enable), CSFBNOUSEVAMOS(CSFB VAMOS Pairing Prohibit) Unit: None Actual Value Range: CSFBPMAQADENC, CSFBOPTIFREN, CSFBNOUSEVAMOS Default Value: CSFBPMAQADENC: 0,CSFBOPTIFREN:0,CSFBNOUSEVAMOS:0

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Parame ter ID

NE


CSFBV OQUL ENSUR SW

BSC691 0

SET GCELL SOFT

7 Parameters

Feature Name

Description

GBFD-1 60203

CSFB QoS

Meaning:

GBFD-1 71212

UltraFlash CSFB

Switch for enabling CSFB QoS assurance functions for CSFB and Ultra-Flash CSFB calls. These functions include CSFB preemption and queuing, fullrate channel preferred for CSFB calls, and CSFB VAMOS prohibition. When this parameter is set to CSFBPMAQADENC(CSFB Queuing and Preempt Enable), if a cell becomes congested and has no available channels for a CSFB or Ultra-Flash CSFB call, the call can join a queue or preempt channels occupied by common calls (Common calls refer to calls other than special calls, such as emergency calls, SRVCC calls, and CSFB calls.) that have the same priority as or calls that have lower priorities than this call during an assignment. When this parameter is set to CSFBOPTIFREN(CSFB FR Optimization Enable), the BSC preferentially allocates TCHFs to CSFB and Ultra-Flash CSFB calls during an assignment or intra-BSC handover and prohibits TCHF-to-TCHH handovers after the TCHF allocation. When this parameter is set to CSFBNOUSEVAMOS(CSFB VAMOS Pairing Prohibit), the BSC does not perform VAMOS channel multiplexing on CSFB and Ultra-Flash CSFB calls. GUI Value Range: CSFBPMAQADENC(CSFB Queuing and Preempt Enable), CSFBOPTIFREN(CSFB FR Optimization Enable), CSFBNOUSEVAMOS(CSFB VAMOS Pairing Prohibit) Unit: None Actual Value Range: CSFBPMAQADENC, CSFBOPTIFREN, CSFBNOUSEVAMOS Default Value: CSFBPMAQADENC: 0,CSFBOPTIFREN:0,CSFBNOUSEVAMOS:0

TCHBU SYTHR ES

BSC690 0

SET None GCELL CHMG AD

None

Meaning: If the current channel seizure ratio reaches or exceeds this value, the half-rate TCH is assigned preferentially; otherwise, the full-rate TCH is assigned preferentially. GUI Value Range: 0~100 Unit: % Actual Value Range: 0~100 Default Value: 60

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7 Parameters

Parame ter ID

NE


Feature Name

Description

TCHBU SYTHR ES

BSC691 0

SET None GCELL CHMG AD

None

Meaning: If the current channel seizure ratio reaches or exceeds this value, the half-rate TCH is assigned preferentially; otherwise, the full-rate TCH is assigned preferentially. GUI Value Range: 0~100 Unit: % Actual Value Range: 0~100 Default Value: 60

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8 Counters

8

Counters

Table 8-1 Counters

Counter ID

Counter Name

Counter Description

NE

Feature ID

Feature Name

1282436784

CELL.IMM.A SS.CH.ACT.C SFB.MOC

R3309A:Numbe r of Immediate Assignment Channel Activation Attempts (Early Identification of CSFB MOC)

BSC6900

GBFD-160203

CSFB QoS

1282436784

CELL.IMM.A SS.CH.ACT.C SFB.MOC

R3309A:Numbe r of Immediate Assignment Channel Activation Attempts (Early Identification of CSFB MOC)

BSC6910

GBFD-160203

CSFB QoS

1282436785

CELL.IMM.A SS.CH.ACT.C SFB.MTC

R3309B:Numbe r of Immediate Assignment Channel Activation Attempts (Early Identification of CSFB MTC)

BSC6900

GBFD-160203

CSFB QoS

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8 Counters

Counter ID

Counter Name

Counter Description

NE

Feature ID

Feature Name

1282436785

CELL.IMM.A SS.CH.ACT.C SFB.MTC

R3309B:Numbe r of Immediate Assignment Channel Activation Attempts (Early Identification of CSFB MTC)

BSC6910

GBFD-160203

CSFB QoS

1282436786

CELL.PREEM PT.NONCSFB. HO.REQ

H3102M:Numb er of Handover Requests of Non-CSFB MSs due to CSFB Preemption

BSC6900

GBFD-160203

CSFB QoS

1282436786

CELL.PREEM PT.NONCSFB. HO.REQ

H3102M:Numb er of Handover Requests of Non-CSFB MSs due to CSFB Preemption

BSC6910

GBFD-160203

CSFB QoS

1282436787

CELL.PREEM PT.NONCSFB. HO.SUCC

H3132M:Numb er of Successful Handovers of Non-CSFB MSs due to CSFB Preemption

BSC6900

GBFD-160203

CSFB QoS

1282436787

CELL.PREEM PT.NONCSFB. HO.SUCC

H3132M:Numb er of Successful Handovers of Non-CSFB MSs due to CSFB Preemption

BSC6910

GBFD-160203

CSFB QoS

1282436788

CELL.CSFB.C HAN.ALLOC. SUCC.TIMES. TCHF

R3127F:Numbe r of Full-Rate Channel Allocations for CSFB MSs

BSC6900

GBFD-160203

CSFB QoS

1282436788

CELL.CSFB.C HAN.ALLOC. SUCC.TIMES. TCHF

R3127F:Numbe r of Full-Rate Channel Allocations for CSFB MSs

BSC6910

GBFD-160203

CSFB QoS

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9 Glossary

9

Glossary

For the acronyms, abbreviations, terms, and definitions, see Glossary.

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CSFB QoS(GBSS17.1_01)

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