热度 1|
分成两种情况, 牵涉到的NAS 消息为:
对于attach过程中对于第一个 default APN 发生default Bearer 和dedicated bearer
1. UE -> MME PDN Connectivity Req
UE<- MME Activate Default EPS bearer context Req -----InitialContextSetup initialReq
UE-> MME Activate default EPS bearer context accept -----InitialContextSetup successfuloutcome
UE<-MME Activate dedicated EPS bearer context Req
UE->MME Activate dedicated EPS bearer context Accept.
2. 对于PDN Connectivity 的default APN 的 default Bearer (好绕。。是对于另外一个不是在注册过程中的APN发起PDN Connectivity Req)
UE->MME PDN Connectivity Req
UE<-MME Activate default EPS bearer context Req
UE->MME Activate default EPS bearer context Accept.
1. UE -> MME NAS PDN Connectivity Req: | |
Procedure transaction ID: | 1 |
UE<-MME Activate Default EPS bearer Context Req : | |
EPS bearer identity: | 5 |
Procedure transaction ID: | 1 |
UE->MME Activate Default EPS bearer Context Resp: | |
EPS bearer identity: | 5 |
Procedure transaction ID: | 0 |
UE<-MME Activate Dedicated EPS bearer context Req: | |
EPS bearer identity: | 6 |
Procedure transaction ID: | 0 |
Linked EPS bearer ID: | 5 |
UE->MME Activate Dedicated EPS bearer context Resp: | |
EPS bearer identity: | 6 |
Procedure transaction ID: | 0 |
2.
1. UE -> MME NAS PDN Connectivity Req: | |
Procedure transaction ID: | 2 |
UE<-MME Activate Default EPS bearer Context Req : | |
EPS bearer identity: | 7 |
Procedure transaction ID: | 2 |
UE->MME Activate Default EPS bearer Context Resp: | |
EPS bearer identity: | 7 |
Procedure transaction ID: | 0 |
从这两次过程可以看出。Linked Bearer ID 出现的位置。 PTI 对于ESM transaction 的用意。 一旦ESM session可以通过 EPS ID 关联的时候, PTI 就没用了。
并且随后dedicate beaer 通过使用 Linked Bearer ID 去关联之前的bearer,完成ESM Context 的路由关系。
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