IDFT Support without SGW Relocation Call Flow

This section describes the IDFT Support without SGW Relocation call flow.

IDFT Support without SGW Relocation Call Flow
IDFT Support without SGW Relocation Call Flow Description

Step

Description

1

Call is connected with the Source eNodeB and there’s a decision to trigger relocation via S1.

The MME sends the Create IDFT Request to the SGW-C.

2

The MME receives the Create IDFT Response from the SGW-C.

3

The indirect forwarding of the data starts from the Source eNodeB to the SGW-C.

The indirect forwarding of the data starts from the SGW-C to the eNodeB.

The Target eNodeB sends the Downlink Data to the UE.

The Target eNodeB sends the Uplink Data to the UP.

The MME sends the Modify Bearer Request to the SGW-C.

4

The SGW-C sends the Modify Bearer Response to the MME.

The UP sends the End Marker to the Source eNodeB, and the Source eNodeB forwards the End Marker to the UP.

The UP sends the Downlink Data and the End Marker to the Target eNodeB.

5

The MME sends the Delete IDFT Request to the SGW-C.

6

The MME receives the Delete IDFT Response from the SGW-C.