Dedicated Bearer Setup – Request Accepted Call Flow

This section describes the Dedicated Bearer Setup – Request Accepted call flow.

Dedicated Bearer Setup – Request Accepted Call Flow
Dedicated Bearer Setup – Request Accepted Call Flow Description

Step

Description

1

The PGW sends the S5 Create Bearer Request to the S5-GTPC-EP pod.

2

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

3

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

  • Creates a new transaction

  • Performs GTP validations

  • Triggers the Sx Modification Request to the PFCP-EP pod

4

The PFCP-EP pod forwards the Sx Modification Request to the UP for allocating SGW Ingress and SGW Egress TEIDs.

5

The PFCP-EP pod receives the Sx Modification Response with SGW Ingress and SGW Egress TEIDs, from the UP.

6

The PFCP-EP pod forwards the Sx Modification Response with SGW Ingress and SGW Egress TEIDs, to the SGW-SVC.

7

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

  • Validates the received SGW Ingress and SGW Egress TEIDs

  • Triggers the S11 Create Bearer Request with the SGW Ingress TEID to the S11-GTPC-EP pod

8

The S11-GTPC-EP pod forwards the S11 Create Bearer Request with the SGW Ingress TEID, to the MME.

9

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

10

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

11

The SGW-SVC receives the S11 Create Bearer response and performs the following:

  • GTP validations

  • Triggers the Sx Modification Request to the PFCP-EP pod to update SGW Ingress and SGW Egress PDR/FAR, with the MME and the PGW GTPU-TEID

12

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

13

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

14

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

15, 16

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

  • Ends the transaction/procedure

  • Updates the CDL

  • Sends the S5 Create Bearer Response with SGW Egress TEIDs with matching PGW GTPU TEIDs, and with the cause as Accepted.