cnSGW-C GTPC Optimization with Inter-rack IPC Call Flow

This section describes the cnSGW-C GTPC Optimization with Inter-rack IPC call flow.

cnSGW-C GTPC Optimization with Inter-rack IPC Call Flow
cnSGW-C GTPC Optimization with Inter-rack IPC Call Flow Description

Step

Description

1

MME sends the S11 Modify Bearer Request to R1-GTPC-EP.

2

R1-GTPC-EP sends the S11 Modify Bearer Request to SGW-service.

Note

The SGW-service section performs the following:

  • Loads the subscriber session.

  • Selects the destination as the S5 or the S8 peer.

3

The following are sub-steps in the Alt SGW PGWc flow non-optimized scenario.

3a

SGW-service sends the S5 or the S8 Modify Bearer Request to R1-GTPC-EP.

3b

R1-GTPC-EP sends the S5 or the S8 Modify Bearer Request to R2-GTPC-EP.

3c

R2-GTPC-EP sends the S5 or the S8 Modify Bearer Request to SMF-service.

3d

SMF-service processes and sends the S5 or the S8 Modify Bearer Response to R2-GTPC-EP.

3e

R2-GTPC-EP sends the Modify Bearer Response to R1-GTPC-EP.

3f

R1-GTPC-EP sends the Modify Bearer Response to SGW-service.

4

Alternatively, the PGWc peer scenario is available in the remote list.

The following are sub-steps in this scenario.

4a

SGW-service sends the IPC Request to R2-GTPC-EP.

Note

The R2-GTPC-EP section performs the following:

  • Encapsulates the S5 or the S8 Modify Bearer Request.

  • Sends it over the inter-rack UDP connection.

4b

R2-GTPC-EP sends the S5 or the S8 Modify Bearer Request to SMF-service.

4c

SMF-service processes and sends the S5 or the S8 Modify Bearer Response to R2-GTPC-EP.

4d

R2-GTPC-EP sends the IPC Response to SGW-service.

Note

The SGW-service section performs the following:

  • Encapsulates the S5 or the S8 Modify Bearer Response.

  • Sends it over the inter-rack UDP connection.

5

SGW-service sends the Modify Bearer Response to R1-GTPC-EP.

6

R1-GTPC-EP sends the Modify Bearer Response to MME.