Cisco Cisco Packet Data Gateway (PDG) Documentation Roadmaps
MME in LTE/SAE Wireless Data Services
How MME Works ▀
Cisco ASR 5000 Series Product Overview ▄
OL-22937-01
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.
request procedure.
Figure 215. 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.
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.