Collision Resolver Discard Handling Call Flow

This section describes the Collision Resolver Discard Handling call flow.

Collision Resolver Discard Handling Call Flow
Collision Resolver Discard Handling Call Flow Description

Step

Description

1

Initial Attach procedure is completed.

The PDN1(ebi 5), PDN2(ebi 6), and PDN3(ebi 7) is established.

The PGW sends the Create Bearer Request for PDN1 to the S5-GTP-EP.

2

The PFCP-EP sends the Create Bearer Request 1 for PDN1 to the cnSGW.

3

The cnSGW sends the Sx Modify Request 1 for PDN1 to the PFCP-EP.

4, 5

The PGW sends the Delete Bearer Request (ebi5) for PDN1 to the cnSGW.

6

Collision detected for PDN1.

The Create Bearer Request is discarded as network initiated PDN deletion request is triggered.

The cnSGW sends a response message with the cause as EGTP_CAUSE_SN_MALFORMED_MSG to the endpoint pod.

The cnSGW sends Create Bearer Response (discard 1) for PDN1 to the S5-GTP-EP.

7

The cnSGW sends the Sx Modify Request 1 (DBR1) for PDN1 to the PFPC-EP.

8

The cnSGW receives the Sx Modify Response 1 (DBR1) for PDN1 from the PFPC-EP.

9

The cnSGW sends the Delete Bearer Request 1 to the S11-GTP-EP.

10

The S11-GTP-EP sends the Delete Bearer Request 1 to the MME.

11

The MME sends the Delete Bearer Response 1 to the S11-GTP-EP.

12

The S11-GTP-EP sends the Delete Bearer Response 1 to the cnSGW.

13

The cnSGW sends the Sx Delete Request for PDN1 to the PFCP-EP.

14

The PFPC-EP sends the Sx Delete Response for PDN1 to the cnSGW.

15

The cnSGW sends the Delete Bearer Response 1 for PDN1 to the PGW.

16

The S5-GTP-EP sends the Delete Bearer Response for PDN1 to the PGW.