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

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

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

  • Skip Sx modification as session is in idle state.

3, 4

Received Modify Bearer request at S5 GTPC-EP POD from SGW-Service POD with ULI. Modify Bearer request is forwarded to PGW.

5, 6

Received Modify Bearer response at S5 GTPC-EP POD from PGW.

Modify Bearer response received at SGW-Service POD.

7

SGW-Service POD forwards Modify Bearer response to S11 GTPC-EP POD ingress.

8, 9

Session updated at CDL. Transaction S-T1 is complete. S11 GTPC-EP POD forwards Modify Bearer response to MME.