Cisco ASR 5000 Series, Обзор продукта

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Mobility Management Entity Overview
▀ How MME Works
▄ Cisco ASR 5000 Series Product Overview
OL-22938-02
Figure 208. Subscriber Registration Setup Message Flow
Insert subscriber data
eNodeB
Attach Request
(user identity)
MME
Attach Request
(user identity)
Random Access
procedure
Serving GW PDN GW
Authentication AKA procedure
Update location
(IMSI)
Insert subscriber
data Ack
Update location
Ack
Create Bearer Request
Create Bearer Response
Attach Accept
(new S-TMSI)
RB_Est-Request
(Attach Accept)
RB_Est-Resp
(Attach Completet)
Attach Complete
(Ini Context Setup)
HSS
Create Bearer Request
Create Bearer Response
Enterprise
Internet
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1. UE and eNodeB performs Random Access procedure.
2.
After Random Access procedure completion, UE sends Attach Request with user identity to eNodeB.
3.
The eNodeB forwards the Attach Request to MME
4. MME starts Authentication procedure with eNodeB and UE.
5.
Once UE get authenticated MS sends Update Location Request to HSS with user IMSI derived during
Authentication procedure.
6.
Once user get validated at HSS with IMSI, HSS sends Insert Subscriber Data Request to MME providing
subscriber profile and service subscription information to MME.
7.
MME sends Create Bearer Request to Serving Gateway.
8.
The S-GW forwards the request to P-GW.
9. P-GW reserves the EPS bearer and sends Create Bearer Response to the S-GW and establishes the EPS bearer
with S-GW for this user.
10.
Once S-GW receives the Create Bearer Response from P-GW it reserves the EPS bearer and sends Create Bearer
Response to the MME and establishes the EPS bearer with MME for this user.