Sxa (smf-proto or Service) Call Flow

This section describes the call flow for the Sxa (smf-proto or service).

Sxa (smf-proto or Service) Call Flow
Sxa (smf-proto or Service) Call Flow Description

Step

Description

1

The MME sends the GTPC-EP message request to the UDP Proxy.

2

The UDP Proxy processes handleProtoUDPMessage and sends ProtocolIPCSender to the GTPC-EP.

3

The GTPC-EP processes ProcessUDPRequest and sends GtpServiceUsrIPCSender to the SGW-SVC.

4

The SGW-SVC processes and sends doGtpSyncIPCExchg to the GTPC-EP.

5

The GTPC-EP sends sendMsgtoUdpProxy to the UDP Proxy.

6

The UDP Proxy processes handleProtocolIPCMessage and sendUDP messages to the PGW.

7

The GTPC-EP processes the following requests:

  • It gets the N3T3 values from the interface (S5e for the S5 interface).

  • It retransmits the UDP request, when the T3 interval expires, and the retransmit_count value is less than the value of N3.

8

The GTPC-EP sends the request timed out message to the UDP Proxy.

9

The UDP Proxy processes handleProtocolIPCMessage and sendUDP messages to the PGW.

10

The SGW-SVC receives the Timeout failure response when the retransmit_count is equal to the value of N3, and no response is received.

11

The SGW-SVC sends SendFailureResponse to the GTPC-EP, with the cause as Peer not Responding.

12

The GTPC-EP sends sendMsgtoUdpProxy to the UDP Proxy.

13

The UDP Proxy processes handleProtocolIPCMessage and sendUDP messages to the MME