3.1.3.2 NGAP INITIAL CONTEXT SETUP RESPONSE ............................................................................................... 44
3.1.3.3 RRC SecurityModeCommand .............................................................................................................................. 45
3.1.3.4 RRC SecurityModeComplete ............................................................................................................................... 45
3.1.3.5 RRC UECapabilityEnquiry ................................................................................................................................... 45
3.1.3.6 RRC UECapabilityInformation ............................................................................................................................ 46
3.2 UE 上下文修改过程 .................................................................................................................................................. 46
3.3 UE 上下文释放过程 .................................................................................................................................................. 48
4 会话管理 ........................................................................................................................................ 49
4.1 5G QoS Architecture ................................................................................................................................................... 49
4.1.1 概述 ........................................................................................................................................................................ 49
4.1.2 QoS Flow ................................................................................................................................................................ 50
4.1.3 QoS Parameters ....................................................................................................................................................... 51
4.1.4 QoS Flow 到 DRB 的映射 ...................................................................................................................................... 56
4.2 PDU 会话建立过程 ................................................................................................................................................... 58
4.3 PDU 会话修改过程 ................................................................................................................................................... 59
4.4 PDU 会话释放过程 ................................................................................................................................................... 59
4.5 关键消息解读 ........................................................................................................................................................... 60
4.5.1 NGAP PDU SESSION RESOURCE SETUP REQUEST ....................................................................................... 60
4.5.2 NGAP PDU SESSION RESOURCE SETUP RESPONSE ..................................................................................... 63
4.5.3 NGAP PDU SESSION RESOURCE MODIFY REQUEST ................................................................................... 63
4.5.4 NGAP PDU SESSION RESOURCE MODIFY RESPONSE ................................................................................. 65
4.5.5 RRCReconfiguration ............................................................................................................................................... 65
4.5.6 RRCReconfigurationComplete ................................................................................................................................ 66
5 寻呼流程 ........................................................................................................................................ 67
5.1 5GC 寻呼 .................................................................................................................................................................... 67
5.1.1 信令流程 ................................................................................................................................................................ 68
5.1.2 关键消息解读 ........................................................................................................................................................ 70
5.1.2.1 NGAP PAGING .................................................................................................................................................... 70
5.1.2.2 RRC PAGING ....................................................................................................................................................... 71
5.2 RAN 寻呼 ................................................................................................................................................................... 71
5.2.1 信令流程 ................................................................................................................................................................ 72
5.2.2 关键消息解读 ........................................................................................................................................................ 73
5.2.2.1 RAN PAGING ...................................................................................................................................................... 73
5.3 寻呼消息发送 ........................................................................................................................................................... 75
6 切换流程 ........................................................................................................................................ 77
6.1 站内切换 ................................................................................................................................................................... 77
6.2 Xn 切换 ...................................................................................................................................................................... 80
6.3 N2 切换 ...................................................................................................................................................................... 82
6.4 LNR 切换 ................................................................................................................................................................... 83
