Patent ID: 8953505
Filing Date: 2015-02-10
Classification: H04L

Abstract:
1. A method for communicating hybrid automatic retransmit request (HARQ) data with a mobile station and a base station by using a frame in a wireless communication system employing a relay station, the method performed by the relay station and comprising: obtaining, by the relay station, basic assignment information for downlink on a first subframe of a time division duplexing (TDD) frame including a plurality of subframes, wherein each TDD frame is indexed by a frame index, and each of the plurality of subframes in the TDD frame is indexed by a subframe index, wherein the TDD frame includes at least one downlink subframe for an access zone followed by at least one downlink subframe for a relay zone followed by at least one uplink subframe for the access zone followed by at least one uplink subframe for the relay zone, and wherein the access zone is configured between the relay station and the mobile station, wherein the relay zone is configured between the relay station and the base station; transmitting, by the relay station, a HARQ packet to the mobile station on the first subframe of the TDD frame; and receiving, by the relay station, a HARQ feedback for the HARQ packet from the mobile station, wherein, if a total number of downlink subframes included in the TDD frame is 5 and a total number of uplink subframes included in the TDD frame is 3, a ratio of the at least one downlink subframe for the access zone, the at least one downlink subframe for the relay zone, the at least one uplink subframe for the access zone, and the at least one uplink subframe for the relay zone in the TDD frame is set to 3:2:2:1 or 2:3:1:2, wherein a subframe index of a subframe carrying the HARQ feedback is defined by where n denotes the subframe index of the subframe carrying the HARQ feedback, D denotes the total number of downlink subframes included in the TDD frame, U denotes the total number of uplink subframes included in the TDD frame, m denotes the subframe index of the first subframe, and K denotes a temporary variable which is defined by wherein a frame index of a subframe carrying the HARQ feedback is defined by where j denotes the frame index of the subframe carrying the HARQ feedback, i denotes a frame index of a subframe carrying the HARQ packet, and z denotes a temporary variable which is defined by where N