TD-LTE参数详解

7.9.2非关机去附着

7.9.2.1 IDLE下发起的非关机去附着

UEeNBEPCthe EPS capability of the UE is disabled1. RA Preamble 2. RA Response 3. RRC Connection Request4. RRC Connection Setup5. RRCConnectionSetupComplete(包含Detach Request)6. Initial UE message(包含Detach Request) 本地清空所有EPS承载和RB资源7. Security本地清空该UE的所有EPS承载和TEID资源8. DOWNLINK NAS TRANSPORT(包含Detach Accept)9. DLInformationTransfer(包含Detach Accept)10. UE CONTEXT RELEASE COMMAND 11. RRC Connection Release12. UE CONTEXT RELEASE COMPLETE又进入IDLE模式

7.9.2.2 CONNECTED下发起的非关机去附着

UEeNBEPCthe EPS capability of the UE is disabled1. ULInformationTransfer(开开Detach request开开)2. UPLINK NAS TRANSPORT开开开Detach request开开开开开开开开开EPS开开开RB开开开开开开开UE开开开EPS开开开TEID开开3. DOWNLINK NAS TRANSPORT(开开Detach Accept开开)4. DLInformationTransfer开开开Detach Accept开开开5. UE CONTEXT RELEASE COMMAND 6. RRC Connection Release7. UE CONTEXT RELEASE COMPLETE

7.10 切换流程

当UE在CONNECTED模式下时,eNodeB可以根据UE上报的测量信息来判决是否需要执行切换,如果需要切换,则发送切换命令给UE,UE不区分切换是否改变了eNodeB。非竞争切换流程图如下:

UESource eNBTarget eNBEPC1. MeasurementControl(RRC开开开开)Packet dataUL allocation开PDCCH开2. Measurement Report(RRC开开)开开开开Packet data3. HO Request开开开开4. HO Request Ack5. RRC Connection Reconfiguration(HO Command)开开开开开开开开开Deliver buffered packets to T_eNB6. SN Status TransferBuffer packets from S_eNB7. Random Access Preamble 8. Random Access Response 9. RRC Connection Reconfiguration Complete(HO Confirm)Path Switch10. Release ResourceFlush DL BufferRelease Resources 7.11 专用承载建立流程

7.11.1正常流程

专用承载建立可以由UE或者MME主动发起,eNB不能主动发起,并且只能在connected下发起该流程。

UEeNBEPCconnected开开开开开开开开1. ULInformationTransfer(开开Bearer resource allocation request)2. UPLINK NAS TRANSPORT开开开Bearer resource allocation request开3. 开开开开开开4. E-RAB SETUP/MODIFY REQUEST(开开Activate/Modify dedicated EPS bearer context request)5. RRCConnectionReconfiguration开开开Activate/Modify dedicated EPS bearer context request开6. RRCConnectionReconfigurationComplete7. E-RAB SETUP/MODIFY RESPONSE8. ULInformationTransfer开开开Activate/Modify dedicated EPS bearer context accept开9. UPLINK NAS TRANSPORT开开开Activate/Modify dedicated EPS bearer context accept开Uplink Data10. 开开开开开开Downlink Data 说明:

1)如果是MME主动发起的承载建立流程,则无步骤1、2; 2)UE发起的承载建立流程,核心网可以回复承载建立、修改流程; 3)可以同时建立多个专用承载,但目前还不支持。

7.11.2异常流程 7.11.2.1 核心网拒绝

UEeNBEPCconnected下无匹配的分类器1. ULInformationTransfer(包含Bearer resource allocation request)2. UPLINK NAS TRANSPORT(包含Bearer resource allocation request)3. 承载分配请求,被拒绝4. DOWNLINK NAS TRANSPORT(包含Bearer resource allocation reject)5. DLInformationTransfer(包含Bearer resource allocation reject) 如果拒绝原因值是\,UE会本地去激活存在的默认承载。

7.11.2.2 eNB本地建立失败(核心网主动发起的建立)

如果eNB建立失败,会回复E-RAB SETUP RESPONSE,带失败建立的承载列表,并带原因值,核心网应该根据原因值处理(目前eNB的实现是: 如果eNB本地建立失败,即还没有给UE发送RRC重配消息,这时eNB会发送NAS NON DELIVERY INDICATION给MME)。但目前核心网没有查看原因值,都给UE下发了Deactivate EPS bearer context request消息(与协议不符),UE查找不到该承载,也回复Deactivate EPS bearer context accept。

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