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 receiving a signal in a wireless communication system, performed by a relay station, the method comprising:
configuring a downlink 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;
receiving one or more reference signals transmitted on an antenna port 7 from a base station;
receiving an R-PDCCH (relay-physical downlink control channel) from the base station in the downlink subframe; and
demodulating the R-PDCCH based on the one or more reference signals;
wherein, when a last OFDM symbol used for receiving an R-PDSCH (relay-physical downlink shared channel) is set to a sixth symbol of a second slot of the downlink subframe, the one or more reference signals are received using only one or more resource elements in a first slot of the downlink subframe.
2. The method of claim 1 , wherein, when the R-PDCCH is received through the first slot of the downlink subframe, the R-PDCCH is received from the base station starting with a fourth OFDM symbol of the first slot of the downlink subframe.
3. The method of claim 1 , wherein the first slot and the second slot comprise 7 OFDM symbols in a normal cyclic prefix (CP).
4. The method of claim 1 , further comprising: transmitting, by the relay station, an access signal to a user equipment in the downlink subframe, wherein OFDM symbols used for transmission of the access signal and OFDM symbols used for the reception of the R-PDCCH are time multiplexed.
5. A relay station for 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:
configures a downlink 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,
receives one or more reference signals transmitted on an antenna port 7 from a base station,
receives an R-PDCCH (relay-physical downlink control channel) from the base station in the downlink subframe, and
demodulates the R-PDCCH based on the one or more reference signals,
wherein, when a last OFDM symbol used for receiving an R-PDSCH (relay-physical downlink shared channel) is set to a sixth symbol of a second slot of the downlink subframe, the one or more reference signals are received only using one or more resource elements in a first slot of the downlink subframe.
6. The relay station of claim 5 , wherein, when the R-PDCCH is received through the first slot of the downlink subframe, the R-PDCCH is received from the base station starting with a fourth OFDM symbol of the first slot of the downlink subframe.
7. The relay station of claim 5 , wherein the first slot and the second slot comprise 7 OFDM symbols in a normal cyclic prefix (CP).
8. The relay station of claim 5 , wherein the processor further transmits an access signal to a user equipment in the downlink subframe, wherein OFDM symbols used for transmission of the access signal and OFDM symbols used for the reception of the R-PDCCH are time multiplexed.