在5G(NR)無線網(wǎng)絡(luò)中，針對RRC增加了INACTIVE狀態(tài)；終端根據(jù)基站、UE和基站及UE信息從RRC連接態(tài)轉(zhuǎn)入RRC INACTIVE態(tài)；當(dāng)UE處于INACTIVE狀態(tài)，遇到5G(NR)網(wǎng)絡(luò)覆蓋較差時可重選到4G網(wǎng)絡(luò)（不支持4G到5G重選）；

1. RRC INACTIVE觸發(fā)

        處于RRC連接態(tài)（RRC CONNECTED）的UE終端通過掛起（SuspendConfig）轉(zhuǎn)入INACTIVE；而觸發(fā)掛起是由網(wǎng)絡(luò)側(cè)通過高層(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狀態(tài)掛起（Suspend）配置參數(shù)整理：kangguoying20200622

        在網(wǎng)絡(luò)高層(RRC）下發(fā)的掛起參數(shù)中，配置了（掛起時）終端的RNTI，尋呼周期，無線區(qū)域，周期更新和跳頻信息。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恢復(fù)（Resume）

         處理INACTIVE狀態(tài)的終端，由于業(yè)務(wù)或更新將恢復(fù)RRC的連接，觸發(fā)原因有以下幾種：

           emergency              --------------------緊急業(yè)務(wù)整理：kangguoying20200622

           highPriorityAccess    --------------------高級接入整理：kangguoying20200622

           mt-Access               --------------------被叫接入整理：kangguoying20200622

           mo-Signalling          --------------------主叫信令整理：kangguoying20200622

           mo-Data                 --------------------主叫數(shù)據(jù)

           mo-VoiceCall           --------------------主叫音頻通話

           mo-VideoCall           --------------------主叫視頻通話

           mo-SMS                  --------------------主叫短信整理：kangguoying20200622

           rna-Update              --------------------跟蹤區(qū)更新信

           mps-PriorityAccess     --------------------mps接入整理：kangguoying20200622

           mcs-PriorityAccess     --------------------mcs接入整理：kangguoying20200622

4.RRC恢復(fù)（Resume）參數(shù)配置整理：kangguoying20200622

          高層(RRC）下發(fā)的恢復(fù)（Resume）參數(shù)配置中除終端的I-RNTI外，還配置了MAC層的地址；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))}

原文來自：http://www.sharetechnote.com/   整理：kangguoying20200622