Method for allocating reference signals of a backhaul link in a relay communication system, and method and apparatus for transmitting/receiving data using same
The present invention relates to a method and to an apparatus for transmitting/receiving data in a relay communication system. The method comprises the steps of: setting, as a guard band, the first predetermined number of symbol transmission slots of a data transmission period in a subframe resource element of a downlink channel constituted by a control signal transmission period to which a control signal is allocated and the data transmission period to which downlink data is allocated; allocating reference signals to symbols of the data transmission period; puncturing the symbols corresponding to the guard band from among the symbols to which said reference signals are allocated; and transmitting signals to which said reference signals are allocated.
1. A method for receiving a downlink reference signal in a wireless access system, the method comprising:
receiving, by a receiving device, a reference signal via a downlink subframe comprising a first slot and a second slot,
wherein each of the first slot and the second slot includes base station-to-relay node transmission symbols, and
wherein the base station-to-relay node transmission symbols included in the second slot are selectively allocated to either whole or partial symbols of the second slot, and
wherein the reference signal is not mapped to a specific symbol in the second slot when the base station-to-relay node transmission symbols included in the second slot are selectively allocated to the partial symbols of the second slot.
2. The method of claim 1 , wherein the partial symbols comprise six symbols.
3. The method of claim 1 , wherein a period of the specific symbol is smaller than a period of the second slot.
4. The method of claim 1 , wherein the second slot further includes a guard period corresponding to a last symbol of the second slot.
5. The method of claim 4 , wherein the specific symbol comprises a base station-to-relay node transmission symbol included in the second slot and a symbol corresponding to the guard period.
6. The method of claim 4 , wherein the guard period is a period where the relay node performs a mode change from a receiving mode to a transmitting mode.
7. The method of claim 1 , wherein the downlink subframe is an MBSFN (Multicast Broadcast Single Frequency Network) subframe.
8. The method of claim 1 , wherein the reference signal is mapped to the specific symbol in the second slot when the base station-to-relay node transmission symbols included in the second slot are selectively allocated to the whole symbols of the second slot.
9. A method for a base station to transmit a reference signal in a wireless access system, the method comprising:
mapping, by the base station, the reference signal to a downlink subframe, the downlink subframe comprising a first slot and a second slot,
wherein each of the first slot and the second slot includes base station-to-relay node transmission symbols, and
wherein the base station-to-relay node transmission symbols included in the second slot are selectively allocated to either whole or partial symbols of the second slot, and
wherein the reference signal is not mapped to a specific symbol in the second slot when the base station-to-relay node transmission symbols included in the second slot are selectively allocated to the partial symbols of the second slot; and
transmitting, by the base station, the reference signal via the downlink subframe to the relay node.
10. The method of claim 9 , wherein the partial symbols comprise six symbols.
11. The method of claim 9 , wherein a period of the specific symbol is smaller than a period of the second slot.
12. The method of claim 9 , wherein the second slot further includes a guard period corresponding to a last symbol of the second slot.
13. The method of claim 12 , wherein the specific symbol comprises a base station-to-relay node transmission symbol included in the second slot and a symbol corresponding to the guard period.
14. The method of claim 12 , wherein the guard period is a period where the relay node performs a mode change from a receiving mode to a transmitting mode.
15. The method of claim 9 , wherein the reference signal is mapped to the specific symbol in the second slot when the base station-to-relay node transmission symbols included in the second slot are selectively allocated to the whole symbols of the second slot.
16. An apparatus for receiving a downlink reference signal in a wireless access system, the apparatus comprising:
a wireless communication unit configured to transceive a wireless signal from/to outside; and
a processor connected to the wireless communication unit,
wherein the processor controls the wireless communication unit to receive a reference signal via a downlink subframe comprising a first slot and a second slot,
wherein each of the first slot and the second slot includes base station-to-relay node transmission symbols,
wherein the base station-to-relay node transmission symbols included in the second slot are selectively allocated to either whole or partial symbols of the second slot, and
wherein the processor controls the reference signal not to be mapped to a specific symbol in the second slot when the base station-to-relay node transmission symbols included in the second slot are selectively allocated to the partial symbols of the second slot.
17. The apparatus of claim 16 , wherein a period of the specific symbol is smaller than a period of the second slot.
18. The apparatus of claim 16 , wherein the reference signal is mapped to the specific symbol in the second slot when the base station-to-relay node transmission symbols included in the second slot are selectively allocated to the whole symbols of the second slot.