IP Address Exhaustion Handling Call Flow for 4G Sessions

This section describes how the SMF handles the IP address exhaustion condition in a 4G session.

The following figure illustrates the IP address exhaustion handling call flow for 4G sessions.

IP Address Exhaustion Handling Call Flow for 4G Sessions
IP Address Exhaustion Handling Call Flow Description for 4G Sessions

Step

Description

1

SGW-C sends the Create Session Request to PGW-C.

2

Upon detecting the exhaustion of IP address in a 4G call, the PGW-C reads the configured back-off timer value and cause. Then, PGW-C sends this timer value and cause in the Create Session Response message to SGW-C.