非常详细的lte信令流程介绍

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LTE信令流程


目 录


第一章 协议层与概念.......................................................................................................................4

1.1 控制面与用户面.............................................................................................................4

1.2 接口与协议.....................................................................................................................4

1.2.1 NAS协议(非接入层协议).......................................................................................6

1.2.2 RRC层(无线资源控制层).......................................................................................6

1.2.3 PDCP层(分组数据汇聚协议层)..............................................................................7

1.2.4 RLC层(无线链路控制层)........................................................................................7

1.2.5 MAC层(媒体接入层).............................................................................................8

1.2.6 PHY层(物理层).....................................................................................................9

1.3 空闲态和连接态...........................................................................................................11

1.4 网络标识.......................................................................................................................12

1.5 承载概念.......................................................................................................................13


第二章 主要信令流程....................................................................................................................15

2.1 开机附着流程...................................................................................................................15

2.2随机接入流程....................................................................................................................18

2.3 UE 发起的service request 流程..................................................................................22

2.4寻呼流程............................................................................................................................25

2.5切换流程............................................................................................................................26

2.5.1 切换的含义及目的......................................................................................................26

2.5.2 切换发生的过程.........................................................................................................27

2.5.3 站内切换...................................................................................................................27

2.5.4 X2切换流程...............................................................................................................29

2.5.5 S1切换流程...............................................................................................................31

2.5.6 异系统切换简介.........................................................................................................33

2.6 CSFB 流程.........................................................................................................................34

2.6.1 CSFB主叫流程...........................................................................................................35

2.6.2 CSFB被叫流程...........................................................................................................36

2.6.3 紧急呼叫流程.............................................................................................................38

2.7 TAU流程...........................................................................................................................39

2.7.1 空闲态不设置“ACTIVE”的TAU流程.......................................................................40

2.7.2 空闲态设置“ACTIVE”的TAU流程..........................................................................42

2.7.3 连接态TAU流程........................................................................................................44

2.8专用承载流程....................................................................................................................45

2.8.1 专用承载建立流程......................................................................................................45

2.8.2 专用承载修改流程......................................................................................................47

2.8.3 专用承载释放流程......................................................................................................49

2.9去附着流程........................................................................................................................51

2.9.1 关机去附着流程.........................................................................................................51

2.9.1 非关机去附着流程......................................................................................................52

2.10 小区搜索、选择和重选................................................................................................54

2.10.1 小区搜索流程...........................................................................................................54

2.10.1 小区选择流程...........................................................................................................55

2.10.3 小区重选流程...........................................................................................................56


第三章 异常信令流程....................................................................................................................59

3.1 附着异常流程...................................................................................................................60

3.1.1 RRC连接失败.............................................................................................................60

3.1.2 核心网拒绝................................................................................................................61

3.1.3 eNB未等到Initial context setup request消息.........................................................62

3.1.4 RRC重配消息丢失或eNB内部配置UE 的安全参数失败.............................................63

3.2 ServiceRequest 异常流程.............................................................................................64

3.2.1 核心网拒绝................................................................................................................64

3.2.2 eNB建立承载失败.....................................................................................................65

3.3 承载异常流程...................................................................................................................67

3.3.1核心网拒绝.................................................................................................................67

3.3.2 eNB本地建立失败(核心网主动发起的建立)............................................................67

3.3.3 eNB未等到RRC重配完成消息,回复失败.................................................................68

3.3.4 UE NAS层拒绝..........................................................................................................69

3.3.5上行直传NAS消息丢失..............................................................................................70


第四章 系统消息解析....................................................................................................................71

4.1 系统消息...........................................................................................................................72

4.2 系统消息解析...................................................................................................................73

4.2.1 MIB (Master Information Block)解析..................................................................73

4.2.2 SIB1 (System Information Block Type1)解析......................................................74

4.2.3 SystemInformation消息...........................................................................................76


第五章 信令案例解析....................................................................................................................82

5.1实测案例流程....................................................................................................................83

5.2 流程中各信令消息解析...................................................................................................84

5.2.1 RRC_CONN_REQ:RRC连接请求................................................................................84

5.2.2 RRC_CONN_SETUP:RRC连接建立.............................................................................85

5.2.3 RRC_CONN_SETUP_CMP:RRC连接建立完成............................................................89

5.2.4 S1AP_INITIAL_UE_MSG:初始直传消息.......................................................................89 5.2.5 S1AP_INITIAL_CONTEXT_SETUP_REQ:初始化文本建立请求......................................91

5.2.6 RRC_UE_CAP_ENQUIRY:UE能力查询........................................................................93

5.2.7 RRC_UE_CAP_INFO:UE能力信息...............................................................................94

5.2.8 S1AP_UE_CAPABILITY_INFO_IND:UE能力信息指示..................................................98

5.2.9 RRC_SECUR_MODE_CMD:RRC安全模式命令.........................................................103

5.2.10 RRC_CONN_RECFG:RRC连接重配置.....................................................................104

5.2.11 RRC_SECUR_MODE_CMP:RRC安全模式完成........................................................107

5.2.12 RRC_CONN_RECFG_CMP:RRC连接重配置完成....................................................108

5.2.13 S1AP_INITIAL_CONTEXT_SETUP_RSP:初始化文本建立完成..................................108

5.2.14 S1AP_ERAB_MOD_REQ:ERAB修改请求................................................................109

5.2.15 RRC_DL_INFO_TRANSF:RRC下行直传消息...........................................................110

5.2.16 S1AP_ERAB_MOD_RSP:ERAB修改完成................................................................111

5.2.17 RRC_CONN_RECFG:RRC连接重配置.....................................................................111

5.2.18 RRC_UL_INFO_TRANSF:RRC上行直传消息...........................................................116

5.2.19 S1AP_UL_NAS_TRANS:上行NAS直传消息...........................................................116

5.2.20 RRC_CONN_RECFG_CMP:RRC连接重配置完成....................................................118

5.2.21 RRC_CONN_RECFG:RRC连接重配置.....................................................................118

5.2.22 RRC_CONN_RECFG_CMP:RRC连接重配置完成....................................................119

5.2.23 RRC_MEAS_RPRT:RRC测量报告............................................................................120

5.2.24 RRC_UL_INFO_TRANSF:RRC上行信息传输...........................................................121

5.2.25 S1AP_UL_NAS_TRANS:上行NAS信息传输...........................................................121

5.2.26 S1AP_UE_CONTEXT_MOD_REQ:UE 文本更改请求................................................122

5.2.27 S1AP_UE_CONTEXT_MOD_RSP:UE 文本更改响应................................................123

5.2.28 RRC_CONN_REL:RRC连接释放.............................................................................123

5.2.29 S1AP_UE_CONTEXT_REL_REQ:UE文本释放请求...................................................124

5.2.30 S1AP_UE_CONTEXT_REL_CMD:UE文本释放命令.................................................125

5.2.31 S1AP_UE_CONTEXT_REL_CMP:UE文本释放完成..................................................126

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