User-Initiated Subscriber De-Registration Setup Procedure - Cisco ASR 5000 series Product Overview

Mobility Management Entity Overview
11. MME sends Attache Accept Response to eNodeB with new S-TMSI for this user.
12. The eNodeB sends Radio Bearer Establish Request as Attach Accept Response to UE to establish Radio bearer
with UE.
13. UE sends Radio Bearer Establish Response as Attach Complete Response to eNodeB.
14. The eNodeB sends Attach Complete Response to MME with Initial EPS Bearer Context Setup procedure.
15. EPS Bearer established between UE and PDN through eNodeB, S-GW, and P-GW and subscriber session starts.

User-initiated Subscriber De-registration Setup Procedure

The following figure and the text that follows describe the message flow for a user-initiated subscriber de-registration
procedure.
Figure 209. Subscriber De-registration Setup Message Flow
1
Random Access
procedure
Detach Request
3
Detach Accept
10
Radio Resource
Release
1. Subscriber session established between UE, eNodeB, S-GW, and P-GW.
2. Optional. If UE in idle or dormant mode it will initiate Random Access procedure.
3. UE initiates detach procedure and sends Detach Request to eNodeB.
4. eNodeB forwards the UE Detach Request to MME.
5. MME sends the Delete Session Request to S-GW for this subscriber.
6. S-GW forwards the Delete Session Request to P-GW for this subscriber.
7. P-GW deletes the EPS bearer for this subscriber and sends the Delete Session Response to S-GW.
OL-22938-02
eNodeB
2
Detach Request
Detach Accept
9
S1 Release Command
11
12
S1 Release Complete
MME Serving GW
1
4
Delete Bearer Request
5
Delete Bearer Response
8
13
14
15
PDN GW
1
Delete Bearer Request
6
Delete Bearer Response
7
Purge UE
Purge UE Ack
Cisco ASR 5000 Series Product Overview ▄
How MME Works ▀
HSS