Method and apparatus for multicast and broadcast services

A method performed by a base station, the method comprising:

• receiving, from a first node, a handover request associated with a user equipment (UE) at a second node, wherein the handover request comprises transmission information that indicates at least one packet sequence number of the following:
• a highest packet sequence number of successfully delivered packets, a highest packet sequence number of transmitted packets, a packet sequence number for a first packet for which there is no sequence number yet assigned, or a bitmap of packet sequence numbers of packets for which have been successfully delivered or unsuccessfully delivered;
• transmitting, from the second node to the first node, handover acknowledge information indicating that the handover request is allowed;
• and
• determining, in the second node, whether forwarding multicast and broadcast services (MBS) data to the second node by the first node is needed, wherein the MBS data is delivered via a shared delivery mode in a wireless network.

A base station, comprising:

• at least one memory;
• and
• at least one processor coupled with the at least one memory and configured to cause the base station to perform all of the following:
• receive multicast and broadcast services (MBS) data associated with a user equipment (UE) at the base station, wherein the MBS data is delivered via a shared delivery mode in a wireless network;
• transmit transmission information of the MBS data from the base station, wherein the transmission information indicates at least one packet sequence number of the following:
• a highest packet sequence number of successfully delivered packets, a highest packet sequence number of transmitted packets, a packet sequence number for a first packet for which there is no sequence number yet assigned, or a bitmap of packet sequence numbers of packets for which have been successfully delivered or unsuccessfully delivered;
• receive handover acknowledge information at the base station, wherein the handover acknowledge information indicates that a handover request associated with the UE is allowed by another base station;
• and
• determine whether to forward the MBS data to the another base station in response to receiving the handover acknowledge information.

A base station, comprising:

• at least one memory;
• and
• at least one processor coupled with the at least one memory and configured to cause the base station to perform all of the following:
• receive, from a first node, a handover request associated with a user equipment (UE) at a second node, wherein the handover request comprises transmission information that indicates at least one packet sequence number of the following:
• a highest packet sequence number of successfully delivered packets, a highest packet sequence number of transmitted packets, a packet sequence number for a first packet for which there is no sequence number yet assigned, or a bitmap of packet sequence numbers of packets for which have been successfully delivered or unsuccessfully delivered;
• transmit, from the second node to the first node, handover acknowledge information indicating that the handover request is allowed;
• and
• determine, in the second node, whether forwarding multicast and broadcast services (MBS) data to the second node by the first node is needed, wherein the MBS data is delivered via a shared delivery mode in a wireless network.