Service Request Procedure; User-Initiated Service Request Procedure - Cisco ASR 5000 Series Administration Manual

MME in LTE/SAE Wireless Data Services
8. S-GW deletes the UE context for this subscriber and sends the Delete Session Response to MME.
9. MME removes the subscriber context and sends the Detach Response to eNodeB.
10. MME sends S1 Release Command to eNodeB.
11. eNodeB forwards the Detach Accept to UE.
12. eNodeB starts Radio Release procedure with UE.
13. Once Radio Release procedure completed with UE, eNodeB sends S1 Release Complete response to MME and
S1 link released for this UE.
14. Once S1 link released for subscriber, MME sends the Purge UE Request to HSS.
15. HSS clears all UE data and sends the Purge UE Ack to MME and subscriber de-registered.

Service Request Procedure

The Service Request procedure is used by the UE in the ECM Idle state to establish a secure connection to the MME as
well as request resource reservation for active contexts. The MME allows configuration of the following service request
procedures:
Prohibition of services
Enforce identity check

User-initiated Service Request Procedure

The following figure and the text that follows describe the message flow for a successful user-initiated subscriber
registration setup procedure.
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