Cisco ASR 5000 Series User Manual

Mobility Management Entity Overview
How MME Works ▀
Cisco ASR 5000 Series Product Overview ▄
OL-22938-02
Figure 210. User-initiated Service Request Message Flow
Initial UE message
(Service Request)
RRC Connection Request
(Service Request)
eNodeB
MME
Random Access procedure
Serving GW
HSS
Contention resolution
RRC Connection Reconfiguration
RRC Connection
Reconfiguration Complete
Authentication (the AKA procedure)
NAS Security Mode Command
(security algorithm)
NAS Security Mode Complete
Initial Context Setup Request
(RB QoS, Security algorithm)
RB_Establishment Request
RB_Establishment Response
Initial Context Setup
Complete
Update Bearer Request
Update Bearer Response
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1. UE and eNodeB performs Random Access procedure.
2. UE sends service request (RRC Connection Request) to eNodeB.
3. eNodeB forwards Service request in Initial UE message to MME.
4. eNodeB preforms contention resolution with UE
5. eNodeB starts RRC connection reconfiguration.
6. eNodeB sends RRC Connection Request Complete and Reconfiguration Complete message to UE.
7. Authentication procedure starts between UE, MME and HSS.
8. eNodeB sends NAS Security Mode Command to UE with selected algorithm.
9. UE sends NAS Security Mode Complete Command to eNodeB.
10. MME sends initial Context Setup Request to eNodeB with radio bearer QoS, security algorithm etc.
11. eNodeB sends RB_Establishment Request to UE.
12. UE sends RB_Establishment Response to eNodeB and radio bearer established.
13. eNodeB sends initial Context Setup Request Response to MME.
14. MME sends Modify Bearer Request to S-GW.

Cisco ASR 5000 Series Specifications

General

Brand	Cisco
Model	ASR 5000 Series
Category	Network Router
Language	English