5.49.1.3 Support of QoS for UEs served by a MWAB

The MWAB-UE considers the traffic from the MWAB-gNB as application layer traffic and applies the related QoS handling as specified in clause 5.7 for BH PDU Session(s). The MWAB-UE may establish and modify the BH PDU Sessions based on necessary information provided by MWAB-gNB (e.g. according to the QoS requirements identified by the MWAB-gNB based on the QoS information of the PDU Session(s) in the UE contexts of the MWAB-gNB and/or based on OAM configuration) via implementation-based internal communication between MWAB-gNB and MWAB-UE.

Based on configuration and traffic mapping specified in TS 38.414 [195] and clause 5.7.1.5, the MWAB-gNB (in the Uplink direction) and the UPFs (in the Downlink direction) in the MWAB Broadcasted PLMN/SNPN set proper marking information (DSCP) for the N3 GTP-U traffic for the UE(s) served by the MWAB-gNB. When Xn is supported for MWAB, based on TS 38.401 [42], the MWAB-gNB and its neighbour NG-RAN node set proper DSCP for the Xn-U traffic based on OAM configurations, as defined in TS 38.424 [217]. The MWAB gNB additionally marks the DSCP value based on configuration for N2, Xn-C and OAM traffic it sources, i.e. not related to PDU Sessions(s) of the UE.

The MWAB-gNB provides the information to the MWAB-UE for the mapping of DSCP values used for N3 traffic and Xn traffic in the MWAB Broadcasted PLMN/SNPN to QoS flows to be used in the BH PLMN/SNPN (including the required Packet Filter Set for filtering of packets) and the corresponding QoS requirements (e.g. QoS Flow level parameters including e.g. 5QI). The MWAB-UE then initiates PDU session establishment or modification procedure to establish or update the BH PDU session(s) for N3 traffic and Xn traffic delivery based on the received information.

Based on the information provided by the MWAB-gNB and received during the PDU session establishment/modification, the MWAB-UE processes the UL N3 traffic and Xn traffic as described in clause 5.7.1.7. The BH UPF processes the DL N3 traffic and Xn traffic as described in clause 5.7.1.6.

The MWAB-UE may indicate to the MWAB-gNB the current BH PDU Session's QoS Flow level QoS parameters, e.g. for admission control of the QoS-Flows of the UEs served by the MWAB.