Patent ID: 9553655
Date: 2017-01-24
CPC Classifications: H04B,H04L

Claim:
1. A method of transmitting and receiving a signal for a relay station in a wireless communication system, the method comprising: configuring a subframe, including a plurality of OFDM (orthogonal frequency division multiplexing) symbols in a time domain, as an MBSFN (Multimedia Broadcast multicast service Single Frequency Network) subframe; and receiving a backhaul signal from a base station in the subframe, wherein OFDM symbols used for the reception of the backhaul signal start from a second OFDM symbol, a third OFDM symbol, or a fourth OFDM symbol of the subframe, wherein the subframe comprises a first slot and a second slot in the time domain, wherein both the first slot and the second slot comprise 7 OFDM symbols in a normal cyclic prefix (CP), wherein the backhaul signal comprises an R-PDCCH (relay-physical downlink control channel) which is a control channel to the relay station from the base station, wherein the R-PDCCH is received through the first slot or the second slot from the base station, wherein the R-PDCCH is demodulated based on one or more demodulation reference signals transmitted on antenna port 7, wherein, when the R-PDCCH is received through the first slot, the R-PDCCH is received from the base station starting with a fourth OFDM symbol of the first slot, wherein the backhaul signal further comprises an R-PDSCH, and the R-PDSCH is transmitted only in the second slot, and wherein, when a last symbol of the transmitted R-PDSCH is a sixth OFDM symbol of the second slot, the one or more demodulation reference signals transmitted on the antenna port 7 are only mapped to resource elements in the first slot.