Patent ID: 8942101
Filing Date: 2015-01-27
Classification: H04B,H04J,H04L

Abstract:
1. A method of relaying data by a relay station in a wireless communication system based on time division duplex (TDD) using a radio frame comprising a plurality of downlink subframes and a plurality of uplink subframes, the method comprising: transmitting downlink data to a mobile station (MS) at a downlink subframe; determining whether a first uplink subframe, to be used for transmitting uplink data to a base station (BS), is a linked uplink subframe, wherein the linked uplink subframe is an uplink subframe that is reserved to receive an acknowledgement/non-acknowledgement (ACK/NACK) for the downlink data from the MS; changing an uplink subframe, to be used for receiving the ACK/NACK for the downlink data from the MS, from a first uplink subframe to a second uplink subframe when the first uplink subframe is the linked uplink subframe; transmitting the uplink data to the BS at the first uplink subframe; and receiving the ACK/NACK for the downlink data at the second uplink subframe when the first uplink subframe is the linked uplink subframe, wherein the second uplink subframe is an uplink subframe that is positioned next to the first uplink subframe.