Section: 5.9.4.4 MBS services of interest determination
Content: The UE shall: 1> consider an MBS service to be part of the MBS services of interest if the following conditions are met: 2> the UE is receiving or interested to receive this service via a broadcast MRB; and 2> the session of this service is ongoing or about to start; and 2> one or more MBS FSAIs in the USD for this service is included in SIB21 acquired from the PCell for a frequency belonging to the set of MBS frequencies of interest, determined according to 5.9.4.3 or SIB21 acquired from the PCell does not provide the frequency mapping for the concerned service but that frequency is included in the USD of this service. NOTE: The UE may determine whether the session is ongoing from the start and stop time indicated in the User Service Description (USD), see TS 38.300[ NR; NR and NG-RAN Overall description; Stage-2 ]  [2] or TS 23.247[ Architectural enhancements for 5G multicast-broadcast services ]  [67].