Data-receiving method and apparatus for relay station in wireless communication system
A method for receiving data by a relay station (RS) in a wireless communication system includes: receiving radio resource allocation information via an R-PDCCH (R-Physical Downlink Control Channel); and receiving data from a base station (BS) via an R-PDSCH (R-Physical Downlink Shared Channel) indicated by the radio resource allocation information, wherein the radio resource allocation information includes information regarding an allocation of resource blocks in a frequency domain and information regarding an allocation of OFDM symbols in a time domain. Since the radio resource allocation information providing information regarding a time relationship between a control channel transmitted by the BS to a UE and a control channel transmitted by the RS to a UE connected to the RS is provided, the RS can reliably receive a signal transmitted from the BS in a backhaul link between the BS and the RS in a wireless communication system including the RS.
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.
2. The method of claim 1 , further comprising:
transmitting an access signal to a relay user equipment in the subframe,
wherein OFDM symbols used for transmission of the access signal and OFDM symbols used for the reception of the backhaul signal are time multiplexed.
3. A relay station for transmitting and receiving a signal in a wireless communication system, the relay station comprising:
a radio frequency unit configured to transmit and receive a radio signal; and
a processor coupled to the radio frequency unit, wherein the processor is configured to:
configure 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
receive 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 and ending with a seventh 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.