Patent ID: 9198169
Filing Date: 2015-11-24
Classification: H04B,H04L,H04W

Abstract:
1. A method for transmitting an aperiodic sounding reference signal (A-SRS) to a base station (BS) by a relay node (RN) in a wireless communication system comprising: receiving backhaul downlink (DL) subframe configuration information from the base station (BS); allocating backhaul uplink (UL) subframes on the basis of the backhaul DL subframe configuration information; receiving configuration information of UL subframes for A-SRS transmission from the BS; receiving an indicator for triggering the A-SRS transmission from the base station (BS); and if a first UL subframe among the UL subframes for the A-SRS transmission is allocated as the backhaul UL subframe, transmitting the A-SRS to the BS in the first UL subframe, wherein, if the first UL subframe is not allocated as the backhaul UL subframe, the A-SRS is transmitted to the BS at a second UL subframe among the UL subframes for the A-SRS transmission, wherein the second UL subframe is the closest UL subframe for the A-SRS transmission after the first UL subframe and is allocated as the backhaul UL subframe, and wherein: transmission power of the A-SRS transmitted in the second UL subframe is determined by power parameters for the A-SRS transmission configured for the first UL subframe if an uplink data channel is not transmitted between the first UL subframe and the second UL subframe, and the transmission power of the A-SRS transmitted in the second UL subframe is determined by the power parameters for the uplink data channel if the uplink data channel is transmitted between the first UL subframe and the second UL subframe.