Cisco ASR 5000 Series Administration Manual page 46

▀ How MME Works
Figure 9.
R a n d o m A cce ss p ro ce d u re
1
R R C C o n n e ctio n R e q u e st
2
(S e rvice R e q u e st)
C o n te n tio n re so lu tio n
R R C C o n n e ctio n R e co n fig u ra tio n
R e co n fig u ra tio n C o m p le te
N A S S e cu rity M o d e C o m m a n d
8
(se cu rity a lg o rith m )
N A S S e cu rity M o d e C o m p le te
R B _ E sta b lish m e n t R e q u e st
1 1
R B _ E sta b lish m e n t R e sp o n se
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 Mobility Management Entity Administration Guide
46
User-initiated Service Request Message Flow
e N o d e B
4
5
R R C C o n n e ctio n
6
A u th e n tica tio n (th e A K A p ro ce d u re )
9
1 2
M M E
In itia l U E m e ssa g e
(S e rvice R e q u e st)
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In itia l C o n te xt S e tu p R e q u e st
(R B Q o S , S e cu rity a lg o rith m )
In itia l C o n te xt S e tu p
C o m p le te
1 5
MME in LTE/SAE Wireless Data Services
H S S
3
1 0
1 3
U p d a te B e a re r R e q u e st
U p d a te B e a re r R e sp o n se
S e rvin g G W
1 4
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