Section: 4.22.5 Reporting of Access Availability
Content: After the MA PDU session is established, if Reporting of Access Availability is required by network, the UE performs detection of the unavailability and availability of an access as described in clause 5.32.5.3 of TS 23.501[ System architecture for the 5G System (5GS) ]  [2]. To report the availability/unavailability of the access, the UE sends the PMF-Access Report to the UPF via the user plane of any available access of the MA PDU session. The UPF shall use this report to decide which access can be used to deliver the downlink packets.