Patent ID: 8982765
Filing Date: 2015-03-17
Classification: H04B

Abstract:
1. A data transmission method of a base station (BS) in a radio relay communication system, the method comprising: obtaining, by a first BS, radio resource information scheduled by a neighbor BS with respect to a first relay node (RN) located within an overlapping cell coverage between the first BS and the neighbor BS; receiving, by the first BS, information regarding inter-cell interference (ICI) generated as the first BS transmits backhaul data to a second RN or a macro user equipment (UE), from the first RN, wherein the received information regarding the ICI includes a frequency reuse factor (FRF) and a precoding matrix index (PMI) related to the ICI; when the first BS has backhaul data to be transmitted to the first RN, scheduling the backhaul data of the first BS on a radio resource allocated by the neighbor BS; when the first BS has backhaul data to be transmitted to the second RN or the macro UE, scheduling, by the first BS, the backhaul data of the first BS on the radio resource which has been allocated by the neighbor BS; adjusting, by the first BS, a setting of beamforming for backhaul data transmission to the second RN or the macro UE such that ICI with respect to the first RN is minimized based on the received information regarding the ICI; and transmitting, by the first BS, the backhaul data of the first BS on the radio resource according to a frequency reuse factor (FRF), wherein the radio resource is resource blocks, and the resource blocks are divided into a subframe and a frequency band, wherein the FRF is set to use 1 in a central area of a cell and is set to use greater than 1 in a cell boundary area, and wherein a backhaul link, through which the backhaul data is transmitted, includes a relay physical downlink shared channel (R-PDSCH) and a relay physical downlink channel (R-PDCCH).