-
Attach procedure
UE
eNodeB
new
MME
Old
MME/SGSN
Serving
GW
EIR
3. Identification Request
3. Identification Response
PDN GW
PCRF
HSS
1. Attach
Request
2. Attach
Request
4.
Identity Request
4. Identity
Response
5a. Authentication / Security
5b.
Identity Request/Response
5b. ME Identity
Check
6. Ciphered Options Request
6. Ciphered Options Response
(E)
7. Delete Sesion Request
7. Delete Session Response
8. Update Location Request
9. Cancel Location
9. Cancel Location Ack
10. PCEF Initiated IP-CAN
10. Delete Session Request
Session
Termination
10. Delete Session
Response
(B)
7. PCEF Initiated IP-CAN
Session Termination
(A)
(F)
11. Update
Location Ack
12. Create
Session Request
13. Create
Session Request
14. PCEF
Initiated IP-CAN Session
Establishment/Modification
15. Create Session Response
16. Create Session Response
17. Initial Context Setup Request /
Attach Accept
18. RRC Connection
Reconfiguration
19. RRC
Connection Reconfiguration Complete
20. Initial Context Setup
Response
21. Direct
Transfer
22. Attach
Complete
First Uplink
Data
23. Modify Bearer
Request
23a. Modify Bearer
Request
23b. Modify Bearer
Response
(D)
24. Modify Bearer Response
First Downlink Data
25. Notify Request
26. Notify Response
(C)
First Downlink Data (if not
handover)
1
UE-initiated Detach
procedure
UE
eNodeB
MME
SGSN
Serving
GW
PDN GW
PCRF
HSS
1. Detach
Request
2. Delete Session
Request
3. Delete Session
Response
4. Detach
Notification
5. Delete
Session Request
6. Delete
Session Request
7. Delete
Session Response
8. PCEF
Initiated IP-CAN
Session Termination
(A)
9. Delete Session Response
11. Detach Accept
10. Detach Ack
12. Signalling Connection
Release
MME-initiated Detach procedure
UE
eNodeB
1. Detach Request
2. Delete Session Request
3. Delete Session Response
4. Detach Notification
5. Delete Session Request
6. Delete Session Request
7. Delete
Session Response
8. PCEF Initiated IP-
CAN
Session Termination
(A)
9. Delete
Session Response
10. Detach Ack
11. Detach Accept
12.
Signalling Connection Release
(B)
MME
SGSN
Serving GW
PDN GW
PCRF
HSS
2
Tracking Area
Update procedures
UE
eNodeB
RNC
new
MME
1. Trigger to start
TAU procedure
old MME/
new Serving
old Serving
PDN
GW
GW
GW
old
S4
SGSN
HSS
PCRF
2. TAU
Request
3. TAU Request
4. Context Request
5.
Context Response
6. Authentication /
Security
7.
Co
n
text
Acknowledge
8. Create
Session Request
9.
Modify Bearer Request
(A)
9a. PCEF Initiated IP-CAN
Session Modification
10. Modify Bearer
Response
11. Create Session
Response
12. Update Location
13. Cancel Location
15. Iu
Release Command
16. Iu Release
Complete
14. Cancel Location Ack
17.
Update Location Ack
20. TAU
Accept
21. TAU
Complete
18. Delete Session Request
(B)
19. Delete Session
Response
3
Service Request procedures
UE
eNodeB
MME
Serving GW
PDN GW
PCRF
1. NAS:
Service Request
2. NAS:
Service Request
3.
Authentication/Security
4.
S1-AP: Initial Context Setup Request
5. Radio Bearer Establishment
6. Uplink Data
7. S1-AP: Initial Context Setup
Complete
8. Modify Bearer
Request
9. Modify Bearer
Request
10. PCEF Initiated
IP-CAN
(A)
Session Modification
11.
Modify Bearer Response
12.
Modify Bearer Response
4
HSS
S1 release procedure
UE
eNodeB
1. RRC
Connection Release
1. S1-AP:
S1 UE Context Release Request
2. Release Access Bearers
Request
3. Release Access
Bearers Response
4. S1-AP:
S1 UE Context Release Command
5. RRC Connection Release
6. S1-AP: S1 UE Context Release
Complete
MME
Serving GW
5
Dedicated bearer activation
UE
eNodeB
MME
Serving
GW
(A)
PDN GW
PCRF
1. IP-CAN
Session
Modification
2.
Create Bearer Request
3. Create Bearer Request
4. Bearer Setup Request/
Session Management Request
5. RRC Connection
Reconfiguration
6. RRC
Connection Reconfiguration Complete
7. Bearer Setup
Response
8. Direct
Transfer
9. Session
Management Response
10.
Create Bearer Response
11.
Create Bearer Response
12.
IP-CAN Session
Modification
(B)
6