Methods and apparatuses for handling a MBS at a RAN node

A network entity for wireless communication as a radio access network (RAN) node, comprising:

• at least one memory;
• and
• at least one processor coupled with the at least one memory and configured to cause the network entity to:
• receive information relating to one or more on-going multicast broadcast service (MBS) for a user equipment (UE), the one or more on-going MBS being anchored at one or more RAN nodes including the RAN node;
• and
• transmit configuration information to another RAN node to cause at least some or all of data relating an on-going MBS of the one or more on-going MBS for the UE to be provided to the UE by the RAN node, wherein the configuration information is transmitted in response to:
• receiving an accept message from the another RAN node responsive to an offer message, the offer message including the information relating to the on-going MBS associated with the UE at the RAN node;
• or
• receiving a first request message from the another RAN node, the first request message requesting the RAN node to provide the on-going MBS associated with the UE at the RAN node.

A user equipment (UE) for wireless communication, comprising:

• at least one memory;
• and
• at least one processor coupled with the at least one memory and configured to cause the UE to:
• receive information relating to one or more on-going multicast broadcast services (MBS) anchored at one or more candidate radio access network (RAN) nodes;
• receive configuration information from a RAN node;
• start a conditional primary secondary cell (PSCell) additional and change (CPAC) procedure based on the received configuration information, at least some or all of data relating to an on-going MBS of the one or more on-going MBS being received from a candidate RAN node of the one or more candidate RAN nodes;
• and
• transmit a radio resource control (RRC) reconfiguration complete message to the candidate RAN node or a core network node.