Abort Handling of Low-Priority Procedure Call Flow

This section describes the Abort Handling of Low-Priority Procedure call flow.

Abort Handling of Low-Priority Procedure Call Flow
Abort Handling of Low-Priority Procedure Call Flow Description

Step

Description

1

Initial Attach procedure is completed.

The PDN1(ebi 5) and PDN2(ebi 6,7,8) is established.

The Update Bearer Request (ebi 7) is waiting for the Sx Modify Response and Dedicated Bearer Request dedicated (ebi 7) received from the PGW.

The PGW sends an Update Bearer Request (eBi 7) PDN2 to the S5-GTP-EP.

2

The PFCP-EP sends the Update Bearer Request (eBi 7) PDN2 to the cnSGW.

3

The cnSGW sends the Update Bearer Request (eBi 7) PDN2 to the S11-GTP-EP.

4

The S5-GTP-EP forwards the Update Bearer Request (eBi 7) PDN2 to the MME.

5

The MME sends an Update Bearer Response to the S11-GTP-EP.

6

The S11-GTP-EP sends a Update Bearer Response to the cnSGW.

7

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

8

The PGW sends the Delete Bearer Request (eBi 7) for PDN2 to the S5-GTP-EP.

9

The S5-GTP-EP forwards Delete Bearer Request (eBi 7) for PDN2 to the cnSGW.

10

Collision is detected for PDN2.

The Update Bearer Request is discarded as high priority-dedicated bearer delete received for the same bearer.

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

The cnSGW sends Update Bearer Response (Discard) for PDN2 to the S5-GTP-EP.

11

The GTP-EP drops the Update Bearer Response message at endpoint pod and not forwarded to the PGW.

The cnSGW sends the Sx Modify Request 1 for PDN2 to the PFCP-EP.

12

The PFCP-EP sends the Sx Modify Response 1 for PDN2 to the cnSGW.

13

The cnSGW sends the Delete Bearer Request for PDN2 to the S11-GTP-EP.

14

The S11-GTP-EP sends the Delete Bearer Request (ebi 7) for PDN2 to the MME.

15

The MME sends the Delete Bearer Response for PDN2 to the S11-GTP-EP.

16

The S11-GTP-EP sends the Delete Bearer Response for PDN2 to the cnSGW.

17

The cnSGW sends the Sx Modify Request for PDN2 to the PFCP-EP.

18

The PFCP-EP sends Sx Modify Response for PDN2 to the cnSGW.

19

The cnSGW sends the Delete Bearer Response for PDN2 to the S5-GTP-EP.

20

The S5-GTP-EP sends the Delete Bearer Response for PDN2 to the PGW.