Inter/Intra-MME Handover Active-Idle Transition Call Flow

This section describes the Inter/Intra-MME Handover Active-Idle transition call flow.

Inter/Intra-MME Handover Active-Idle Transition Call Flow
Inter/Intra-MME Handover Active-Idle Transition Call Flow Description

Step

Description

1, 2

For inter-MME, received Modify Bearer request at SGW-Service POD via S11-GTPC-EP POD with MME control F-TEID and ULI. There is no eNodeB F-TEID.

For intra-MME, received Modify Bearer request at SGW-Service POD with only ULI present:

  • Create a new transaction S-T1.

  • Validate Modify Bearer request.

3, 4

Received Sx Modification request at PFCP-EP POD from SGW-Service POD with downlink FAR as BUFFER. Sx Modification request is forwarded to UP.

5, 6

Received Sx Modification response at at PFCP-EP POD from UP. Sx Modification response received at SGW-Service POD.

7

SGW-Service POD forwards Modify Bearer response to GTPC-EP POD ingress.

8, 9

Session updated at CDL. Transaction S-T1 is complete. GTPC-EP POD forwards Modify Bearer response to MME.