Method and a device for data retransmission

A second node in a communication system, the second node comprising:

• a transceiver;
• and
• a controller configured to:
• transmit, to a first integrated access and backhaul (IAB) node, information indicating to report the information on an available buffer size of the first IAB node, via an adaptation layer associated with an IAB network, and
• receive, from the first IAB node, the information on the available buffer size of the first IAB node, via the adaptation layer associated with the IAB network,
• wherein identification information indicating the second node is to receive information on an available buffer size of the first IAB node from the first IAB node is transmitted from a third node to the first IAB node,
• wherein the first IAB node comprises a function of distributed unit for a base station and a function for a user equipment (UE),
• wherein the second node corresponds to an IAB node or a distributed unit of the base station, and
• wherein the third node corresponds to a donor central unit of a base station.

A third node in a communication system, the third node comprising:

• a transceiver;
• and
• a controller configured to:
• generate identification information indicating a second node which is to receive information on an available buffer size of a first integrated access and backhaul (IAB) node from the first IAB node, and
• transmit, to the first IAB node, the generated identification information indicating the second node is to receive the information on the available buffer size of the first IAB node,
• wherein information indicating to report the information on the available buffer size of the first IAB node is transmitted from the second node to the first IAB node, via an adaptation layer associated with an IAB network, and
• wherein the information on an available buffer size of the first IAB node is transmitted from the first IAB node to the second node indicated by the identification information generated by the third node, via the adaptation layer associated with the IAB network;
• wherein the first IAB node comprises a function of distributed unit for a base station and a function for a user equipment (UE),
• wherein the second node corresponds to an IAB node or a distributed unit of the base station, and
• wherein the third node corresponds to a donor central unit of a base station.