MBR Optimization Call Flow

This section describes the high-level MBR Optimization call flow for idle↔active transition.

MBR Optimization Call Flow
MBR Optimization Call Flow Description

Step

Description

1

MME sends Release Access Bearer (RAB) request to UDP proxy.

2

UDP Proxy forwards RAB Request to GTP-S11.

3

GTP-S11 forwards RAB Request to SGW-service.

4

SGW-service sends Sx Modify List for all PDNs to PFCP.

5

SGW-service prepones RAB Response.

6

GTP-S11 sends RAB Response to UDP Proxy.

7

UDP Proxy sends RAB Response to MME.

8

PFCP sends and receives Sx Modify for IMS APN to and from UPF.

9

PFCP sends and receives Sx Modify for Data APN to and from UPF.

10

PFCP sends Sx Modify Response List for all PDNs to SGW-service.

11

MME sends Service Request MBRequest for IMS PDN to UDP Proxy.

12

UDP Proxy forwards Service Request MBRequest for IMS PDN with TEID cache data to GTP-S11.

13

GTP-S11 sends MBResponse for IMS PDN to UDP Proxy.

14

UDP Proxy forwards MBResponse for IMS PDN to MME.

15

MME sends Service Request MBRequest for Data PDN to UDP Proxy.

16

UDP Proxy sends Service Request MBRequest for Data PDN with TEID cache data to GTP-S11.

17

GTP-S11 sends MBRequest List for IMS and Data PDNs to SGW-service.

18

SGW-service sends Sx Modify List for IMS and Data PDN to PFCP.

19

PFCP sends and receives Sx Modify for IMS PDN to and from UPF.

20

PFCP sends and receives Sx Modify for Data PDN to and from UPF.

21

PFCP sends Sx Modify Response List for IMS and Data PDN to SGW-service.

22

SGW-service sends ULI Update MBRequest List for IMS and Data PDN (Async Notification) to GTP-S5.

23

SGW-service sends MBResponse List for Data PDN to GTP-S11.

24

GTP-S11 sends MBResponse for Data PDN to UDP Proxy.

25

UDP Proxy forwards MBResponse for Data PDN to MME.

26

GTP-S5 sends and receives ULI Update MBRequest for IMS PDN to and from PGW.

27

GTP-S5 sends and receives ULI Update MBRequest for Data PDN to and from PGW.

28

SGW-service sends DDN Request to GTP-S11.

29

S-11 forwards DDN Request to UDP Proxy.

30

UDP Proxy forwards DDN Request to MME.

31

MME sends Service Request MBRequest to UDP Proxy.

32

UDP Proxy sends Service Request MBRequest with TEIDCacheData to GTP-S11.

33

GTP-S11 sends MBResponse List for IMS and Data PDNs to SGW-service.

34

MME sends Service Request MBRequest for IMS PDN to UDP Proxy.

35

UDP Proxy Service Request MBRequest for IMS PDN with TEID cache data to GTP-S11.

36

GTP-S11 sends MBResponse for IMS PDN to UDP Proxy.

37

UDP Proxy sends MBResponse for IMS PDN to MME.

38

SGW-service sends DDN Request to GTP-S11.

39

GTP-S11 forwards DDN Request to UDP Proxy.

40

UDP Proxy sends internal DDN acknowledgement to GTP-S11.

41

MME sends Service Request MBRequest for Data PDN to UDP Proxy.

42

MME sends Service Request MBRequest for Data PDN with TEID cache data to GTP-S11.

43

GTP-S11 sends MBRequest List for IMS and Data PDNs to SGW-service.