TD-LTE参数详解

UEeNBEPC1. 承载分配请求2. E-RAB SETUP REQUEST(包含Activate dedicated EPS bearer context request)3. E-RAB SETUP RESPONSE(带E-RAB Failed List,cause \resources not available\)4. 本地释放承载

7.11.2.3 eNB未等到RRC重配完成消息,回复失败

UEeNBEPC1. 承载分配请求2. E-RAB SETUP REQUEST(包含Activate dedicated EPS bearer context request)3. RRCConnectionReconfiguration(包含Activate dedicated EPS bearer context request)4. RRCConnectionReconfigurationComplete定时器超时5. E-RAB SETUP RESPONSE(带E-RAB Failed List,cause \in the Radio Interface Procedure\)6. 承载释放7. UE CONTEXT RELEASE REQUEST8. 更新承载9. UE CONTEXT RELEASE COMMAND 10. RRCConnectionRelease11. UE CONTEXT RELEASE COMPLETE

eNB未收到RRC重配完成消息时,会给核心网发UE上下文释放请求消息。

7.11.2.4 UE NAS层拒绝

如果是UE的NAS层拒绝,则核心网收到后会给eNB发送E-RAB释放消息,来释放刚刚建立的S1承载,此时不带NAS PDU。eNB收到消息后,发RRC重配给UE来释放刚建立的DRB参数。

UEeNBEPC1. 承载分配请求2. E-RAB SETUP REQUEST(包含Activate dedicated EPS bearer context request)3. RRCConnectionReconfiguration(包含Activate dedicated EPS bearer context request)4. RRCConnectionReconfigurationComplete5. E-RAB SETUP RESPONSE6. UE侧NAS层承载建立失败7. ULInformationTransfer(包含Activate dedicated EPS bearer context reject)8. UPLINK NAS TRANSPORT(包含Activate dedicated EPS bearer context reject)9. 承载释放10. E-RAB RELEASE COMMAND(不含NAS PDU)11. RRCConnectionReconfiguration(带释放DRB列表)12. RRCConnectionReconfigurationComplete13. E-RAB RELEASE RESPONSE

7.11.2.5 上行直传NAS消息丢失

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4. E-RAB SETUP REQUEST(包含Activate dedicated EPS bearer context request)5. RRCConnectionReconfiguration(包含Activate dedicated EPS bearer context request)6. RRCConnectionReconfigurationComplete7. E-RAB SETUP RESPONSE8. ULInformationTransfer(包含Activate dedicated EPS bearer context accept)定时器超时,重发9. DOWNLINK NAS TRANSPORT(包含Activate dedicated EPS bearer context request)10. DLInformationTransfer(包含Activate dedicated EPS bearer context request)11. ULInformationTransfer(包含Activate dedicated EPS bearer context accept)12. ULLINK NAS TRANSPORT(包含Activate dedicated EPS bearer context accept)

说明:

如果核心网没有收到UE回复的NAS消息,会重发请求消息,重发4次后,如果还没收到应答则放弃。

7.12 专用承载修改流程

7.12.1正常流程

专用承载修改可以由UE 、MME主动发起,不能由eNB主动发起,只能在connected下发起该流程。流程图如下:

7.12.1.1 修改QoS

UEeNBEPCconnected下修改一个专用EPS承载1. ULInformationTransfer(包含Bearer resource modification request)2. UPLINK NAS TRANSPORT(包含Bearer resource modification request)3. 承载修改请求4. E-RAB SETUP/MODIFY/RELEASE COMMAND(包含Activate/Modify/Deactivate EPS bearer context request)5. RRCConnectionReconfiguration(包含Activate/Modify/Deactivate EPS bearer context request)6. RRCConnectionReconfigurationComplete7. E-RAB SETUP/MODIFY/RELEASE RESPONSE8. ULInformationTransfer(包含Activate/Modify/Deactivate EPS bearer context accept)9. UPLINK NAS TRANSPORT(包含Activate/Modify/Deactivate EPS bearer context accept)10. 承载修改响应

说明:

1)MME主动发起的承载建立/修改/释放无步骤1、2;

2)eNB主动发起的释放,无步骤1,步骤2改为发送E-RAB RELEASE INDICATION消息

给MME;

3)UE发起的承载修改流程,核心网可以回复承载建立、修改、释放流程。

7.12.1.2 不修改QoS,只修改TFT

UEeNBEPCconnected下修改一个专用EPS承载1. ULInformationTransfer(包含Bearer resource modification request)2. UPLINK NAS TRANSPORT(包含Bearer resource modification request)3. 承载修改请求4. DOWNLINK NAS TRANSPORT(包含Modify EPS bearer context request)5. DLInformationTransfer(包含Modify EPS bearer context request)6. ULInformationTransfer(包含Modify EPS bearer context accept)7. UPLINK NAS TRANSPORT(包含Modify EPS bearer context accept)8. 承载修改响应

说明:

不修改QoS,只修改TFT参数时,为上下行直传消息,与eNB无关。

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