Section: 4.16.14 Management of access and mobility related policy information depending on the application in use 4.16.14.1 General
Content: The procedure for management of access and mobility related policy information depending on the application in use enables modification of the access and mobility related policy information on detection of the start and stop of an application. The content of this clause applies to non-roaming and LBO roaming scenario (for any inbound roaming UEs), i.e. to cases where the involved entities (e.g. PCF, SMF and UPF) belong to the serving PLMN. The PCF shall not apply a change of access and mobility related policy information for application traffic detected in PDU Sessions established in Home Routed mode. If PCF for the UE and PCF for the PDU Session are the same PCF, then steps 3, 5, 6, 9 and 12 in Figure 4.16.14.2-1 are not performed. If the PCF for the UE and the PCF for the PDU Session are different PCFs, then the PCF for the UE is informed when a SM Policy Association is established or released by either: - Subscription to the BSF: = see steps 2, 3, 4, 5a, 11 and 12a in Figure 4.16.14.2.1-1. The BSF notifies when a PCF is registered or deregistered for the PDU Session to a DNN, S-NSSAI. - see steps 2, 3, 5 and 8 in Figure 4.16.14.2.2-1. The BSF reports the registration of a PCF for the PDU Session when the first SM Policy Association is established and the deregistration of the PCF for the PDU Session when the last SM Policy Association is terminated for a (DNN, S-NSSAI). - Request to the PCF for the PDU Session to a DNN, S-NSSAI via AMF and SMF. See steps 1, 4, 5b, 11 and 12b in Figure 4.16.14.2-1. The PCF for the PDU Session reports that the SM Policy Association is established as described in clause 4.16.4 and provides the UE address(es). The SM Policy Association Termination notifies the PCF for the UE as described in clause 4.16.6.