16.10.6.5.2 Service Continuity in RRC_CONNECTED

To ensure service continuity of MBS broadcast, the UE in RRC_CONNECTED state may send MBS Interest Indication to the gNB, consisting of the following information:

• List of MBS frequencies UE is receiving or interested to receive, sorted in decreasing order of interest;
• Priority between the reception of all listed MBS frequencies and the reception of any unicast bearer and multicast MRB;
• List of MBS broadcast services the UE is receiving or interested to receive, in case SIB20 is provided for PCell or SCell.

MBS Interest Indication information reporting can be implicitly enabled/disabled by the presence of SIB21.

The gNB may use this information, together with the information about the UE's capabilities (e.g., supported band combinations), when providing an RRC configuration and/or downlink assignments to the UE or to add/release DRBs/multicast MRBs, to allow the UE to receive the MBS services the UE is interested in. MBS Interest Indication information can be exchanged between source gNB and target gNB during handover.