Patent ID: 7765451

Claim:
A method of retransmitting data in a Base Station (BS) in a multi-hop network, comprising the steps of: transmitting data and activating a timer for the data; monitoring receipt of a response message for the data until the timer expires after the timer activation; receiving the response message and, if the response message is a Non-Acknowledgement (NACK), determining whether a Relay Station (RS) has successfully received the data with a Block Sequence Number (BSN) associated with the NACK; retransmitting the data, if the RS has not successfully received the data; determining a retransmission entity, if the RS has successfully received the data; transmitting a control message commanding retransmission to the RS, if the retransmission entity is the RS; and retransmitting the data, if the retransmission entity is the BS.