3.2 异常附着流程
3.2.1 RRC建立失败
RRC建立失败根据信令又分为三种：
1、 RRC建立请求无响应：（或是空口因素导致eNodeB未收到，或是收到但无法正确解码）
UEeNodeBMMEattachRequestrrcConnectionRequest
2、 RRC建立请求正确到达eNodeB，但eNodeB下发的rrc connection setup 消息UE未收到
或收到后无法按照要求建立。
UEeNodeBMMEattachRequestrrcConnectionRequestrrcConnectionSetup
3、 UE上发的rrc connection setup complete 消息在空口丢失导致建立超时。
UEeNodeBMMEattachRequestrrcConnectionRequestrrcConnectionSetuprrcConnectionSetupComplete
3.2.2 核心网拒绝
UEeNodeBMMEattachRequestrrcConnectionRequestrrcConnectionSetuprrcConnectionSetupCompleteInitial UE messageDOWNLINK NAS TRANSPORTattachRejectUE CONTEXT RELEASE COMMANDRRC Connection ReleaseUE CONTEXT RELEASE COMPLETE
3.2.3 eNodeB未收到初始化上下文建立请求
UEeNodeBMMEattachRequestrrcConnectionRequestrrcConnectionSetuprrcConnectionSetupCompleteInitial UE messageInitial context setup requestRRC Connection Release
3.2.4 RRC重配置请求丢失
UEeNodeBMMEattachRequestrrcConnectionRequestrrcConnectionSetuprrcConnectionSetupCompleteInitial UE messageInitial context setup requestueCapabilityEnquiryueCapabilityInformationUE Capability Info IndicationsecurityModeCommandsecurityModeCompleterrcConnectionReconfigurationInitial context setup failureUE CONTEXT RELEASE REQUESTUE CONTEXT RELEASE COMMANDRRC Connection ReleaseUE CONTEXT RELEASE COMPLETE
4 寻呼流程
4.1 寻呼成功流程
4.1.1 空闲态寻呼
UEeNodeBPagingPagingservice requestrrcConnectionRequestrrcConnectionSetuprrcConnectionSetupCompleteInitial UE messageMMEInitial context setup requestsecurityModeCommandsecurityModeCompleterrcConnectionReconfigurationrrcConnectionReconfigurationCompleteInitial context setup response
寻呼成功：MME发起寻呼（S1 接口发送Paing 消息）后收到S1 接口相应的INITIAL UE MESSAGE（NAS: Service Request），则判做寻呼成功
4.1.2 连接态寻呼
4.2 寻呼失败流程
寻呼失败：MME发起寻呼（S1 接口发送Paing 消息），2 秒内未收到S1 接口相应的INITIAL UE MESSAGE，则判做一次寻呼失败
4.2.1 Paging消息不可达
Paging消息在S1口丢失
UEeNodeBPagingMME
Paging消息在空口丢失
UEeNodeBPagingPagingMME
4.2.2 RRC建立失败
RRC建立失败根据信令又分为三种：
1、RRC建立请求无响应：（或是空口因素导致eNodeB未收到，或是收到但无法正确解码）
UEeNodeBPagingPagingservice requestrrcConnectionRequestMME
2、RRC建立请求正确到达eNodeB，但eNodeB下发的rrc connection setup 消息UE未收到