Cisco ASR 5000 Series - Network-Initiated Service Request Procedure

Mobility Management Entity Overview
▀ How MME Works
▄ Cisco ASR 5000 Series Product Overview
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15. S-GW modify the session for this UE and sends Modify Bearer Request response to MME.
Network-initiated Service Request Procedure
The following figure and the text that follows describe the message flow for a successful network-initiated service
request procedure.
Figure 211. Network-initiated Service Request Message Flow
1. Downlink data received on S-GW from PDN for targeted UE.
2. S-GW sends Downlink Data notification to MME for a targeted UE.
3. MME sends Downlink Data notification acknowledgement to S-GW.
4. MME send Paging request to eNodeB for targeted UE.
5. eNodeB broadcasts Paging request in its coverage area for UE.
6. Once identified UE located S-GW and eNodeB starts messaging through UE Paging response.
7. S-GW sends Stop Paging message to MME.
8. Data downlink starts between identified UE and PDN.