CSFB 优化指导手册

CSFB 优化指导手册

Version: 1.0

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NSN TD-LTE CSFB 优化指导手册

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CSFB 优化指导手册

Revision History

Version: 1.0

Date 2014-04-02

Revision V1.0 Revison History Draft version Author Qi Xinfeng Copyright ? Nokia Solutions & Networks 2014 Company Confidential Page 2 (35)

CSFB 优化指导手册

Version: 1.0

目 录

1

LTE CS语音业务实现方案概述............................................................................................................... 7 1.1 1.2 1.3 2

双待终端模式 ................................................................................................................................. 7 CSFB模式 ...................................................................................................................................... 8 VoLTE+SRVCC模式 ..................................................................................................................... 9

CSFB网络架构和流程 ............................................................................................................................ 9 2.1 2.2

CSFB网络架构 ............................................................................................................................ 10 CSFB关键流程 ............................................................................................................................ 11 CSFB话音主叫业务流程 ......................................................................................................... 11 CSFB话音被叫业务流程 ......................................................................................................... 11

2.2.1 2.2.2 3

无线侧CSFB功能配置 ......................................................................................................................... 12 3.1 3.2

主要参数 ...................................................................................................................................... 12 配置实例 ...................................................................................................................................... 14

4 CSFB优化 ............................................................................................................................................ 15 4.1

开机联合附着及联合附着更新 ..................................................................................................... 16

开机联合附着 ....................................................................................................................... 16 联合附着过程优化................................................................................................................ 17

4.1.1 4.1.2 4.2

回落过程 ...................................................................................................................................... 21 CSFB主叫语音回落流程（不支持PSHO） ............................................................................. 21 CSFB被叫语音回落流程 .......................................................................................................... 22 CSFB被叫语音回落流程（连接态，不支持PSHO） ............................................................. 22 回落过程优化 ....................................................................................................................... 23

4.2.1 4.2.2 4.2.3 4.2.4 4.3

返回过程 ...................................................................................................................................... 31

返回方式 .............................................................................................................................. 31 2G重选回4G的主要参数 ....................................................................................................... 33

4.3.1 4.3.2

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CSFB 优化指导手册

4.3.3 5 返回优化 .............................................................................................................................. 34

Version: 1.0

参考资料 ............................................................................................................................................... 35

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