在5G(NR)无线网络中,针对RRC增加了INACTIVE状态;终端根据基站、UE和基站及UE信息从RRC连接态转入RRC INACTIVE态;当UE处于INACTIVE状态,遇到5G(NR)网络覆盖较差时可重选到4G网络(不支持4G到5G重选);
1. RRC INACTIVE触发
处于RRC连接态(RRC CONNECTED)的UE终端通过挂起(SuspendConfig)转入INACTIVE;而触发挂起是由网络侧通过高层(RRC)消息通知UE;整理:kangguoying20200622
RRCRelease-IEs ::= SEQUENCE {
redirectedCarrierInfo RedirectedCarrierInfo OPTIONAL, -- Need N整理:kangguoying20200622
cellReselectionPriorities CellReselectionPriorities OPTIONAL, -- Need R
suspendConfig SuspendConfig OPTIONAL, -- Need R整理:kangguoying20200622
deprioritisationReq SEQUENCE {整理:kangguoying20200622
deprioritisationType ENUMERATED {frequency, nr},整理:kangguoying20200622
deprioritisationTimer ENUMERATED {min5, min10, min15, min30} } OPTIONAL, -- Need N
lateNonCriticalExtension OCTET STRING OPTIONAL,整理:kangguoying20200622
nonCriticalExtension RRCRelease-v1540-IEs OPTIONAL}整理:kangguoying20200622
2.RRC状态挂起(Suspend)配置参数整理:kangguoying20200622
在网络高层(RRC)下发的挂起参数中,配置了(挂起时)终端的RNTI,寻呼周期,无线区域,周期更新和跳频信息。整理:kangguoying20200622
SuspendConfig ::= SEQUENCE {整理:kangguoying20200622
fullI-RNTI I-RNTI-Value,
shortI-RNTI ShortI-RNTI-Value,整理:kangguoying20200622
ran-PagingCycle PagingCycle,整整理:kangguoying20200622理:kangguoying20200622
ran-NotificationAreaInfo RAN-NotificationAreaInfo OPTIONAL, -- Need M
t380 PeriodicRNAU-TimerValue OPTIONAL, -- Need R
nextHopChainingCount NextHopChainingCount, ...}整理:kangguoying20200622
3. RRC恢复(Resume)
处理INACTIVE状态的终端,由于业务或更新将恢复RRC的连接,触发原因有以下几种:
emergency --------------------紧急业务整理:kangguoying20200622
highPriorityAccess --------------------高级接入整理:kangguoying20200622
mt-Access --------------------被叫接入整理:kangguoying20200622
mo-Signalling --------------------主叫信令整理:kangguoying20200622
mo-Data --------------------主叫数据
mo-VoiceCall --------------------主叫音频通话
mo-VideoCall --------------------主叫视频通话
mo-SMS --------------------主叫短信整理:kangguoying20200622
rna-Update --------------------跟踪区更新信
mps-PriorityAccess --------------------mps接入整理:kangguoying20200622
mcs-PriorityAccess --------------------mcs接入整理:kangguoying20200622
4.RRC恢复(Resume)参数配置整理:kangguoying20200622
高层(RRC)下发的恢复(Resume)参数配置中除终端的I-RNTI外,还配置了MAC层的地址;整理:kangguoying20200622
RRCResumeRequest ::= SEQUENCE {整理:kangguoying20200622
rrcResumeRequest RRCResumeRequest-Ies }
RRCResumeRequest-IEs ::= SEQUENCE {整理:kangguoying20200622
resumeIdentity ShortI-RNTI-Value,整理:kangguoying20200622
resumeMAC-I BIT STRING (SIZE (16)),
resumeCause ResumeCause,整理:kangguoying20200622
spare BIT STRING (SIZE (1))}
RRCResumeRequest1 ::= SEQUENCE {整理:kangguoying20200622
rrcResumeRequest1 RRCResumeRequest1-IEs}
RRCResumeRequest1-IEs ::= SEQUENCE {整理:kangguoying20200622
resumeIdentity I-RNTI-Value,整理:kangguoying20200622
resumeMAC-I BIT STRING (SIZE (16)),
resumeCause ResumeCause,
spare BIT STRING (SIZE (1))}
原文来自:http://www.sharetechnote.com/ 整理:kangguoying20200622