Patent ID: 8514768
Filing Date: 2013-08-20
Classification: H04L,H04W

Abstract:
1. A method of transmitting a reference signal performed by a Relay Station (RS) in a wireless communication system, the method comprising: allocating a guard time in the front of a backhaul subframe or the end of the backhaul subframe, the backhaul subframe comprising a plurality of slots, each of the plurality of slots comprising a plurality of symbols, the guard time being a time interval for switching between access link and backhaul link; and transmitting a Demodulation Reference Signal (DMRS) to a base station (BS) in a symbol of the backhaul subframe, wherein the symbol for the DMRS is not overlapped with the guard time, wherein the guard time comprises the first ½ and the last ½ symbol of the backhaul subframe, wherein the backhaul subframe is delayed or advanced for one of ½ symbols, 1 symbol, and 1½ symbols with reference to a base station subframe, which is a uplink subframe transmitted to the base station by a user equipment (UE) corresponding with the backhaul subframe, and wherein a position of a symbol of the BS subframe in which the DMRS is received by the BS is the same as a position of the symbol for the DMRS.