Idle Timer Handling on UPF Call Flow

This section describes the call flow when the idle timer is received in the Create Session Request on the UPF.

Idle Timer Handling on UPF Call Flow
Idle Timer Handling on UPF Call Flow Description

Step

Description

1

If the value of idle_timeout_sec is greater than zero, the timer is started on UPF with granularity of one second.

Else, idle timeout is disabled.

2

The timer timeouts every second. Checks if the difference in current time and last packet received is greater than idle_timeout_sec or not. If the time difference is greater than idle_timeout_sec, then UP sends the Sx Session Report Request with Report Type = UPIR (Inactivity Report) to CP (cnSGW-C).

Value