Configuring UP Inactivity Timer
To configure the UP inactivity timer under DNN profile, use the following commands:
configure
profile dnn dnnprofile_name
userplane-inactivity-timer timer_value
end
NOTES:
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userplane-inactivity-timer timer_value : Specifies the timer value in seconds. timer_value must be an integer in the range of 0-86400. The default value of the timer is 0, which means the function is disabled.
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The SMF sends the configured inactivity timer to the UPF through the N4 PDU Session Establishment request. After the session establishment, if the configured value changes, the SMF reports the changes to the UPF through N4 modification request.
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The UPF starts the inactivity timer when there is no uplink or downlink data transmission over the N3 tunnel. The UPF stops the timer when the data transmission over N3 tunnel is resumed. On expiry of the timer, the UPF sends session report to the SMF with the user plane inactivity request (UPIR) flag set. After receiving the report indication for a session, the SMF clears the session if it is a 4G session and initiates idle mode entry if it is a 5G session.