EPC核心网-系统架构-系统介绍[精品].pptVIP

3. Identification Request 1. Attach Request new MME Old M ME /SGSN Serving GW PCRF HSS 3. Identification Response PDN GW 2. Attach Request eNodeB UE 4. Identity Request 4. Identity Response 5 a . Authentication / Security / ME Identity 17. Attach Accept F irst Uplink Data 19. Radio Bearer establishment response 18. Radio Bearer establishment request 20. Attach Complete 22. Update Bearer Response 21. Update Bearer Request First Downlink Data 23 . Update Location Request 24 . Update Location Response (B) (A) 16. Create Default Bearer Resp onse 12. Create Default Bearer Request 7. Update Location 8. Cancel Location 11. Update Location Ack 8. Cancel Location Ack 9. Delete Bearer Request 9. Delete Bearer Response 13. Create Default Bearer Request 15. Create Default Bea rer Response 6. Delete Bearer Response 6. Delete Bearer Request 10. Insert Subscriber Data 10. Insert Subscriber Data Ack. 14. PCRF Interaction First Downlink Data (C) EIR 5 b . ME Identity Check 6. PCRF interaction 9 . PCRF interaction 会话管理——承载建立流程 在用户附着（接入）的同时建立默认承载，也可以同时建立默认承载和专有承载（依赖于PCC规则） * (B) (1. PCC Decision Provision) 3. Update Bearer Request MME Serving GW PDN GW PCR F 4. Bearer Modify Request 5. Radio Bearer Modify Request 2. Update Bearer request 6. Radio Bearer Modify Respons e 7. Bearer Modify Response 8. Update Bearer Response 9. Update Bearer response (10. Provision Ack) UE eNodeB (A) 会话管理——网络侧发起的承载修改 * 会话管理——专有承载建立过程 （GTP） PCRF根据业务请求生成PCC Rule，包括QCI、ARP、GBR、MBR等信息； PDN GW决定为该业务建立新承载，PDN GW根据PCC Rule生成EPS Bearer QoS，PDN GW向SGW发送创建专用承载请求消息，PDN GW将缺省承载的LBI也发送给SGW，PGW分配S5下行GTPU隧道ID； SGW分配S1上行GTPU隧道ID和S5下行GTPU隧道ID； MME为该新EPS Bearer分配Bearer ID，并向EUTRAN发送Radio Bearer建立请求，MME将S1上行GTUP隧道ID发送给EUTRAN； EUTRAN与UE间建立Radio Bearer，并将Bearer对应的EPS Bearer ID发给UE； EUTRAN将S1下行GTPU隧道ID发送给MME，MME转给SGW，在EUTRAN和SGW间建立S1 Bearer； S