Patent ID: 7991352

Claim:
A retransmission method in a Relay Station (RS) in a multi-hop wireless communication system, comprising: transmitting a first feedback message to a source node and a successfully received data block to a destination node, wherein the first feedback message requests retransmission of a failed data block when the failed data block is among data blocks received from the source node; receiving a retransmitted data block for the failed data block from the source node; receiving from the destination node a second feedback message about data blocks transmitted to the destination node and transmitting the second feedback message to the source node; determining whether the second feedback message indicates that a data block that the RS has successfully received from the source node was not received at the destination node through a comparison of a Block Sequence Number (BSN) of a data block received from the source node with a BSN of a data block received from the destination node; and when the second feedback message indicates that the data block that the RS has successfully received from the source node was not received at the destination node, transmitting the data block and the received retransmitted data block together to the destination node; and when the second feedback message indicates that the data block that the RS has successfully received from the source node was received at the destination node, transmitting the received retransmitted data block to the destination node.