VoLTE信令分析手册
部门 TDD网络基础性能部 作者 张艳丽 00257121 日期 2015-4
目录
VoLTE信令分析手册 .................................................................................................................................. 1 1 2
前言......................................................................................................................................................... 2 初始注册 ................................................................................................................................................ 3 2.1
Initial attach ................................................................................................................................. 4 2.1.1 Attach Request（piggybacked PDN connectivity request） ............................................. 4 2.1.2 Attach Accept(piggybacked Activate default EPS bearer context request)......................... 5 2.2
IMS PDN Connection建立 ........................................................................................................ 6 2.2.1 PDN connectivity request ................................................................................................... 6 2.2.2 E-RAB SETUP REQUEST ................................................................................................. 8 2.2.3 Activate default EPS bearer context request ...................................................................... 8 2.3
IMS域SIP注册 ........................................................................................................................ 9 2.3.1 SIP Register ..................................................................................................................... 10 2.3.2 401 Unauthorized ............................................................................................................. 12 2.3.3 SIP Register ..................................................................................................................... 13 2.3.4 SIP 200 OK ...................................................................................................................... 14
3
VoLTE呼叫VoLTE流程 ..................................................................................................................... 15 3.1
主叫呼叫流程 ........................................................................................................................ 15 3.1.1 RRCConnectionRequest .................................................................................................. 17 3.1.2 RRCConnectionSetup ...................................................................................................... 17 3.1.3 RRCConnectionSetupComplete ....................................................................................... 19 3.1.4 INITIAL UE MESSAGE ..................................................................................................... 19 3.1.5 INITIAL CONTEXT SETUP REQUEST ............................................................................ 19 3.1.6 RRCConnectionReconfiguration（DRB setup-QCI9/QCI5） ......................................... 21 3.1.7 INITIAL CONTEXT SETUP RESPONSE ......................................................................... 23
3.1.8 SIP INVITE ....................................................................................................................... 24 3.1.9 SIP 100 TRYING .............................................................................................................. 28 3.1.10 3.1.11 3.1.12 3.1.13 3.1.14 3.1.15 3.1.16 3.1.17 3.1.18 3.1.19 3.1.20 3.1.21 3.1.22 3.2 3.3
SIP 183 Session Progress ........................................................................................... 28 AAR .............................................................................................................................. 29 AAA .............................................................................................................................. 31 E-RAB SETUP REQUEST ........................................................................................... 32 RRCConnectionReconfiguration（DRB setup-QCI1） .............................................. 33 ACTIVATE DEDICATED EPS BEARER CONTEXT REQUEST .................................. 34 SIP PRACK .................................................................................................................. 36 SIP 200 OK(PRACK) ................................................................................................... 37 SIP UPDATE ................................................................................................................ 37 SIP 200 OK（UPDATE） ........................................................................................... 38 SIP 180 ringing ............................................................................................................. 39 SIP 200 OK（INVITE） .............................................................................................. 39 SIP ACK ....................................................................................................................... 39
被叫呼叫建立流程 ............................................................................................................... 40 VoLTE呼叫释放 ..................................................................................................................... 41 3.3.1 SIP BYE ........................................................................................................................... 42 3.3.2 SIP 200 OK（BYE） ....................................................................................................... 42 3.3.3 STR/STA .......................................................................................................................... 42 3.3.4 E-RAB RELEASE COMMAND ......................................................................................... 43 3.3.5 Deactivate EPS bearer context request ........................................................................... 43
1 前言
本文根据深圳中移动项目VoLTE试商用测试，整理VoLTE呼叫信令流程，关键消息及关键IE
定义说明，并给出了相关协议参考说明，供相关同事了解VoLTE E2E流程，也可根据个人需求，查询相关协议进行深入学习和掌握。 深圳移动VoLTE E2E网元如下： 网元 eNodeB MME S-GW/P-GW PCRF IMS 测试UE 设备商 Huawei Ericsson Ericsson Ericsson Huawei Huawei Mate7 因此，本文信令消息说明，仅包括Huawei侧设备：eNodeB，IMS入口点SBC/P-CSCF，Huawei Mate7。
因如下接口设备不是我司设备，本文未做说明：
1) MME与S-GW，S-GW与P-GW之间遵从GTPv2-C，相应规范为TS 29.274; 2) PCRF与P-GW之间遵从Gx接口协议，相应规范为TS 29.212.
2 初始注册
1) VoLTE UE在LTE网络内发起Initial attach流程，建立数据APN的PDN connection，相应的
default EPS bearer为QCI9/8（由HSS上用户签约数据决定）；
当核心网也支持VoLTE时，MME会在Attach过程中告知UE网络侧支持VoLTE。 2) VoLTE UE发起到IMS APN的PDN connection建立流程，相应的缺省承载为QCI5；在该过
程中，获取IMS入口点P-CSCF地址信息。
3) VoLTE UE发起到IMS域的注册，SIP注册消息承载在QCI5缺省承载上。
2.1 Initial attach
中移动终端会发起combined attach流程，在Initial attach过程中同时完成CSFB附着和普通数据业务附着。
数据APN采用IPv4地址，IMS APN采用IPv6地址。
2.1.1 Attach Request（piggybacked PDN connectivity request）
Attach Request消息关键IE截图： 关键IE IE取值定义 EPS附着类型： 24.301 9.9.3.11 EPS attach type UE请求的IP地址类型： 24.301 9.9.4.10 PDN type 24.008 10.5.5.12 MS network capability 【解析】UE上报srvcc能力和Notification能力给 MME。 24.008 10.5.5.28 Voice domain preference and UE's 【解析】终端上报UE的语音优先策略和终端属性 usage setting 2.1.2 Attach Accept(piggybacked Activate default EPS bearer context request)
Attach Accept关键IE截图： 关键IE IE取值定义 EPS附着结果： 24.301 9.9.3.10 EPS attach result 【解析】这里表示combined attach成功 24.301 9.9.4.9 PDN address 【解析】该例中缺省承载为QCI9，数据APN为cmnet，为UE分配了IPv4地址。