Method for receiving or transmitting downlink signal in wireless communication system and device therefor

1. A method for receiving downlink signal in a wireless communication system for supporting coordinated multiple-point transmission and reception (CoMP), the method comprising:

receiving, by a user equipment (UE), downlink control information comprising a plurality of resource allocation parts of downlink data channel from a base station (BS);

acquiring, by the UE, information on whether or not quasi co-located (QCL) assumption between antenna port(s) of a specific reference signal and antenna port(s) of demodulation reference signals associated with each of the plurality of resource allocation parts is applied; and

demodulating, by the UE, the downlink data channel using the acquired information.

2. The method according to claim 1 , wherein whether or not the QCL assumption is applied is indicated dynamically through a specific field of each of the plurality of resource allocation parts or semi-statically via higher layer signaling.

3. The method according to claim 1 , wherein each of the plurality of resource allocation parts comprises demodulation reference signal configuration information comprising information about antenna port(s), a scrambling identifier and the number of layers for a corresponding demodulation reference signal.

4. The method according to claim 1 , wherein the downlink control information comprises demodulation reference signal configuration information comprising information about antenna port(s), a scrambling identifier and the number of layers for a demodulation reference signal shared by the plurality of resource allocation parts.

5. The method according to claim 1 , wherein resources scheduled by the plurality of resource allocation parts are transmitted by at least two BSs.

6. The method according to claim 1 , further comprising:

acquiring, by the UE, information about resource mapping of a downlink data channel with consideration for antenna port(s) of the specific reference signal to which the QCL assumption is applied.

7. The method according to claim 6 , wherein the information about resource mapping of the downlink data channel is indicated in association with the information on whether or not the QCL assumption is applied.

8. A method for transmitting a downlink signal in a wireless communication system for supporting coordinated multiple-point transmission and reception (CoMP), the method comprising:

transmitting, by a base station (BS), downlink control information comprising a plurality of resource allocation parts of downlink data channel to a user equipment (UE), and

transmitting, by the BS, information on whether or not quasi co-located (QCL) assumption between antenna port(s) of a specific reference signal and antenna port(s) of demodulation reference signals associated with each of the plurality of resource allocation parts is applied,

wherein the downlink data channel is demodulated by the UE using the acquired information.

9. The method according to claim 8 , wherein whether or not the QCL assumption is applied is indicated through a specific field of each of the plurality of resource allocation parts or semi-statically via higher layer signaling.

10. The method according to claim 8 , wherein each of the plurality of resource allocation parts comprises demodulation reference signal configuration information comprising information about antenna port(s), a scrambling identifier and the number of layers for a corresponding demodulation reference signal.

11. The method according to claim 8 , wherein the downlink control information comprises demodulation reference signal configuration information comprising information about antenna port(s), a scrambling identifier and the number of layers for a demodulation reference signal shared by the plurality of resource allocation parts.

12. The method according to claim 8 , wherein resources scheduled by the plurality of resource allocation parts are transmitted by at least two BSs.

13. The method according to claim 8 , further comprising transmitting information about resource mapping of a downlink data channel with consideration for antenna port(s) of the specific reference signal to which the QCL assumption is applied.

14. The method according to claim 13 , wherein the information about resource mapping of the downlink data channel is indicated in association with the information on whether or not the QCL is applied.

15. A user equipment (UE) configured to receive downlink signal in a wireless communication system for supporting coordinated multiple-point transmission and reception (CoMP), the UE comprising:

a radio frequency (RF) unit; and

a processor configured to control the RF unit,

wherein the processor is configured to receive downlink control information comprising a plurality of resource allocation parts of downlink data channel from a base station (BS), to acquire information on whether or not quasi co-located (QCL) assumption between antenna port(s) of a specific reference signal and antenna port(s) of demodulation reference signals associated with each of the plurality of resource allocation parts is applied, and to demodulate the downlink data channel using the acquired information.

16. A base station (BS) configured to receive a downlink signal in a wireless communication system for supporting coordinated multiple-point transmission and reception (CoMP), the BS comprising:

a radio frequency (RF) unit; and

a processor configured to control the RF unit,

wherein the processor is configured to transmit downlink control information comprising a plurality of resource allocation parts of downlink data channel to a user equipment (UE), and to transmit information on whether or not quasi co-located (QCL) assumption between antenna port(s) of a specific reference signal and antenna port(s) of demodulation reference signals associated with each of the plurality of resource allocation parts is applied,

wherein the downlink data channel is demodulated by the UE using the acquired information.