TS29.244-g00 5.11 User plane inactivity detection and reporting

5.11 User plane inactivity detection and reporting

Clause 5.4.4.1 of 3GPP TS 23.401 [14] requires the PGW to initiate the release of an inactive emergency PDN connection.

Clause 4.3.7 and 4.3.2.2.2 of 3GPP TS 23.502 [29] requires the SMF to be able to initiate the deactivation of the UP connection of an existing PDU session without user plane activity for a given inactivity period, except for the H-SMF for the home routed roaming scenario or except for an always-on PDU session as described in clause 5.6.8 of 3GPP TS 23.501 [28].

The CP function may request the UP function to detect and report when no user plane packets are received for an PFCP session, by provisioning the User Plane Inactivity Timer IE in the PFCP Session Establishment Request or PFCP Session Modification Request.

Upon being provisioned with this IE, the UP function shall monitor the user plane activity of the PFCP session, and report any user plane inactivity exceeding the duration indicated by this IE by sending an PFCP Session Report Request with the Report Type set to UPIR (User Plane Inactivity Report). The UP function shall then continue to process any further user plane packets as instructed by the rules provisioned for the PFCP session, until receiving any new instruction from the CP function.