LTE最全信令
第一章 协议层与概念...................................................................................................... 6
1.1 控制面与用户面.......................................................................................... 6
1.2 接口与协议................................................................................................. 7
1.2.1 NAS协议(非接入层协议)..................................................................... 8
1.2.2 RRC层(无线资源控制层)..................................................................... 9
1.2.3 PDCP层(分组数据汇聚协议层)............................................................ 9
1.2.4 RLC层(无线链路控制层).................................................................... 10
1.2.5 MAC层(媒体接入层)......................................................................... 11
1.2.6 PHY层(物理层).................................................................................. 12
1.3 空闲态和连接态......................................................................................... 13
1.4 网络标识................................................................................................... 14
1.5 承载概念................................................................................................... 16
第二章 主要信令流程..................................................................................................... 17
2.1 开机附着流程................................................................................................... 17
2.2随机接入流程.................................................................................................... 20
2.3 UE发起的service request流程....................................................................... 24
2.4寻呼流程........................................................................................................... 27
2.5切换流程........................................................................................................... 28
2.5.1 切换的含义及目的................................................................................... 28
2.5.2 切换发生的过程...................................................................................... 29
2.5.3 站内切换................................................................................................. 29
2.5.4 X2切换流程............................................................................................ 31
2.5.5 S1切换流程............................................................................................ 33
2.5.6 异系统切换简介...................................................................................... 35
2.6 CSFB流程......................................................................................................... 36
2.6.1 CSFB主叫流程........................................................................................ 37
2.6.2 CSFB被叫流程........................................................................................ 38
2.6.3 紧急呼叫流程.......................................................................................... 40
2.7 TAU流程........................................................................................................... 41
2.7.1 空闲态不设置“ACTIVE”的TAU流程................................................... 42
2.7.2 空闲态设置“ACTIVE”的TAU流程....................................................... 44
2.7.3 连接态TAU流程..................................................................................... 46
2.8专用承载流程.................................................................................................... 47
2.8.1 专用承载建立流程................................................................................... 47
2.8.2 专用承载修改流程................................................................................... 49
2.8.3 专用承载释放流程................................................................................... 51
2.9去附着流程........................................................................................................ 53
2.9.1 关机去附着流程...................................................................................... 53
2.9.1 非关机去附着流程................................................................................... 54
2.10 小区搜索、选择和重选................................................................................... 56
2.10.1 小区搜索流程....................................................................................... 56
2.10.1 小区选择流程....................................................................................... 57
2.10.3 小区重选流程....................................................................................... 58
第三章 异常信令流程..................................................................................................... 61
3.1 附着异常流程................................................................................................... 62
3.1.1 RRC连接失败.......................................................................................... 62
3.1.2 核心网拒绝............................................................................................. 63
3.1.3 eNB未等到Initial context setup request消息...................................... 64
3.1.4 RRC重配消息丢失或eNB内部配置UE的安全参数失败......................... 65
3.2 ServiceRequest异常流程................................................................................. 66
3.2.1 核心网拒绝............................................................................................. 66
3.2.2 eNB建立承载失败.................................................................................. 67
3.3 承载异常流程................................................................................................... 69
3.3.1核心网拒绝.............................................................................................. 69
3.3.2 eNB本地建立失败(核心网主动发起的建立)........................................ 69
3.3.3 eNB未等到RRC重配完成消息,回复失败.............................................. 70
3.3.4 UE NAS层拒绝....................................................................................... 71
3.3.5上行直传NAS消息丢失.......................................................................... 72
第四章 系统消息解析..................................................................................................... 73
4.1 系统消息.......................................................................................................... 74
4.2 系统消息解析................................................................................................... 75
4.2.1 MIB (Master Information Block)解析.............................................. 75
4.2.2 SIB1 (System Information Block Type1)解析.................................. 76
4.2.3 SystemInformation消息........................................................................ 78
第五章 信令案例解析..................................................................................................... 84
5.1实测案例流程.................................................................................................... 85
5.2 流程中各信令消息解析..................................................................................... 85
5.2.1 RRC_CONN_REQ:RRC连接请求............................................................. 86
5.2.2 RRC_CONN_SETUP:RRC连接建立......................................................... 87
5.2.3 RRC_CONN_SETUP_CMP:RRC连接建立完成......................................... 91
5.2.4 S1AP_INITIAL_UE_MSG:初始直传消息................................................... 91
5.2.5 S1AP_INITIAL_CONTEXT_SETUP_REQ:初始化文本建立请求.................. 92
5.2.6 RRC_UE_CAP_ENQUIRY:UE能力查询.................................................... 95
5.2.7 RRC_UE_CAP_INFO:UE能力信息........................................................... 96
5.2.8 S1AP_UE_CAPABILITY_INFO_IND:UE能力信息指示............................ 100
5.2.9 RRC_SECUR_MODE_CMD:RRC安全模式命令...................................... 104
5.2.10 RRC_CONN_RECFG:RRC连接重配置................................................. 105
5.2.11 RRC_SECUR_MODE_CMP:RRC安全模式完成.................................... 108
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............... 109
5.2.14 S1AP_ERAB_MOD_REQ:ERAB修改请求............................................. 110
5.2.15 RRC_DL_INFO_TRANSF:RRC下行直传消息........................................ 111
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................................................. 112
5.2.18 RRC_UL_INFO_TRANSF:RRC上行直传消息........................................ 117
5.2.19 S1AP_UL_NAS_TRANS:上行NAS直传消息........................................ 117
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................................. 120
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.......................................................... 124
5.2.29 S1AP_UE_CONTEXT_REL_REQ:UE文本释放请求............................... 125
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