Dedicated Bearer Deletion Procedure Call Flow

This section describes the Dedicated Bearer Delete Procedure call flow.

Dedicated Bearer Deletion Procedure (Single/Multiple Bearer) Call Flow
Dedicated Bearer Deletion Procedure (Single/Multiple Bearer) Call Flow Description

Step

Description

1

The PGW sends the S5 Delete Bearer Request with EBI list containing one or more dedicated bearer EBIs, to the GTPC-EP pod.

2

The GTPC-EP pod forwards the S5 Delete Bearer Request to the SGW-SVC pod.

3

The SGW-SVC pod receives the S5 Delete Bearer request and performs the following:

  • Creates a new transaction

  • Performs GTP validations

  • Triggers the Sx Modification Request to the PFCP-EP pod to suspend uplink/downlink traffic for the requested bearers

4

The PFCP-EP pod forwards the Sx Modification Request to the UP.

5

The UP sends the Sx Modification Response to the PFCP-EP pod.

6

The PFCP-EP pod forwards the Sx Modification Response to the SGW-SVC pod.

7

The SGW-SVC pod receives the Sx Modification Response and triggers the S11 Delete Bearer Request to the GTPC-EP pod.

8

The GTPC-EP pod forwards the S11 Delete Bearer Request to the MME.

9

The MME sends the S11 Delete Bearer Response to the GTPC-EP pod.

10

The GTPC-EP pod forwards the S11 Delete Bearer Response to the SGW-SVC pod.

11

The SGW-SVC receives the S11 Delete Bearer Response and triggers the Sx Modification Request to the PFCP-EP pod, to remove traffic endpoints for removal of the GTPU tunnels for the requested dedicated bearers.

12

The PFCP-EP pod forwards the Sx Modification Request to the UP to remove GTP tunnels for the requested dedicated bearers.

13

The UP sends the Sx Modification Response to the PFCP-EP pod.

14

The PFCP-EP forwards the Sx Modification Response to the SGW-SVC pod.

15

The SGW-SVC receives the Sx Modification Response and performs the following:

  • Ends the transaction/procedure

  • Updates the CDL

  • Sends the S5 Delete Bearer Response with cause as Accepted, to the GTP-EP pod

16

The GTP-EP pod forwards the S5 Delete Bearer Response to the PGW.