Method and apparatus for providing mbs in wireless communication system

A method performed by a central unit (CU) in a wireless communication system, the method comprising:

• obtaining, by the CU, reference time information from each of at least one distributed unit (DU);
• receiving, by the CU, a first message for a multicast broadcast service (MBS) session start request or MBS session update request from an access and mobility management function (AMF);
• performing at least one of coordination or synchronization through the reference time information obtained from each of the at least one DU, in case that an MBS provision area includes a plurality of DUs based on the MBS provision request information;
• transmitting a second message for context setup request including information related to MBS provision to each of the at least one DU;
• and
• receiving a third message for context setup response including information related to MBS provision from each of the at least one DU.

A central unit (CU) in a wireless communication system, the CU comprising:

• at least one transceiver;
• at least one processor;
• and
• at least one memory operatively connected to the at least one processor and configured to store instructions that, when executed, cause the at least one processor to perform a specific operation,
• wherein the specific operation comprises:
• obtaining, by the CU, reference time information from each of at least one distributed unit (DU);
• receiving, by the CU, a first message for a multicast broadcast service (MBS) session start request or MBS session update request from an access and mobility management function (AMF);
• performing at least one of coordination or synchronization through the reference time information obtained from each of the at least one DU, in case that an MBS provision area includes a plurality of DUs based on the MBS provision request information;
• transmitting a second message for context setup request including information related to MBS provision to each of the at least one DU;
• and
• receiving a third message for context setup response including information related to MBS provision from each of the at least one DU.

A method performed by a terminal in a wireless communication system, the method comprising:

• receiving at least one of coordination/synchronization information, a multicast/broadcast service (MBS) service identity information or cell list information from a distributed unit (DU);
• and
• receiving a data packet based on the MBS service in an MBS provision area,
• wherein, in case that the MBS provision area includes a plurality of DUs, a transmission time of the data packet is determined to be the same in the plurality of DUs through a central unit (CU).