Method and apparatus for transmitting/receiving signals with a value indicated by a TPC command being accumulated for all parameter sets

1. A method for communicating with a plurality of transmission points by a User Equipment (UE) in a wireless communication system, the method comprising:

receiving information about a plurality of parameter set groups related to a specific transmission mode via higher-layer signaling, each of the plurality of parameter set groups including a plurality of parameter sets related to the specific transmission mode;

detecting a Physical Downlink Control Channel (PDCCH) including indication information indicating a specific parameter set belonging to one of the plurality of parameter set groups;

receiving a downlink signal using the specific parameter set,

wherein each of the plurality of parameter set groups is configured independently per search space for detection of the PDCCH,

wherein a parameter set group to which the specific parameter set belongs from among the plurality of parameter set groups is determined according to a search space in which the PDCCH is detected, and

wherein if the PDCCH carries a Transmit Power Control (TPC) command, a value indicated by the TPC command is accumulated for the specific parameter set only; and

transmitting a feedback signal for the downlink signal through a Physical Uplink Control Channel (PUCCH) based on the accumulated value for the specific parameter set.

2. The method according to claim 1 , wherein the search space for detection of the PDCCH includes PDCCH candidate groups, and a parameter set group to which the specific parameter set belongs from among the plurality of parameter set groups is determined according to a PDCCH candidate group in which the PDCCH is detected.

3. The method according to claim 1 , wherein the search space for detection of the PDCCH includes a specific subframe group, and a parameter set group to which the specific parameter set belongs from among the plurality of parameter set groups is determined according to a subframe in which the PDCCH is detected.

4. The method according to claim 1 , wherein the search space for detection of the PDCCH is a UE-specific search space or a cell-specific search space, and a parameter set group to which the specific parameter set belongs from among the plurality of parameter set groups is determined according to whether the PDCCH is detected in the UE-specific search space or the cell-specific search space.

5. The method according to claim 1 , wherein each of the plurality of parameter sets includes information about Physical Downlink Shared Channel (PDSCH) resource element mapping and information about a Quasi Co-Located (QCL) relationship between antenna ports.

6. The method according to claim 1 , wherein each of the plurality of parameter sets includes at least one of information about the number of Cell-specific Reference Signal (CRS) antenna ports, information about a CRS frequency shift, information about a Multimedia Broadcast Single Frequency Network (MBSFN) subframe configuration, information about a zero-power Channel Status Information Reference Signal (CSI-RS) resource configuration, information about a PDSCH starting position, information about a CSI-RS resource configuration Identity (ID), information about a scrambling ID for generation of a UE-specific Demodulation Reference Signal (DMRS), information about a CS I-Interference Measurement (CSI-IM) resource, and information about an antenna port QCL type.

7. The method according to claim 5 , wherein if the information about an antenna port QCL type indicates a specific type, each of the plurality of parameter sets further includes information about a cell ID corresponding to a CRS having a QCL relationship with a CSI-RS, the number of antenna ports, and an MBSFN subframe configuration.

8. The method according to claim 1 , wherein each of the plurality of parameter sets includes at least one of information about an open-loop power control parameter for Physical Uplink Control Channel (PUCCH) transmission, information about mapping between the TPC command included in the PDCCH and the value indicated by the TPC command, information indicating whether PUCCH transmission using a plurality of antennas has been configured, information about a Timing Advance (TA) applied to PUCCH transmission, information about a cell ID for generation of a DMRS sequence for PUCCH transmission, information about a Sounding Reference Signal (SRS) transmission subframe, and information about an SRS transmission band.

9. A User Equipment (UE) for communicating with a plurality of transmission points in a wireless communication system, the UE comprising:

a Radio Frequency (RF) unit; and

a processor,

wherein the processor is configured to:

control the RF unit to receive information about a plurality of parameter set groups related to a specific transmission mode via higher-layer signaling, each of the plurality of parameter set groups including a plurality of parameter sets related to the specific transmission mode,

detect a Physical Downlink Control Channel (PDCCH) including indication information indicating a specific parameter set belonging to one of the plurality of parameter set groups,

control the RF unit to receive a downlink signal using the specific parameter set,

wherein each of the plurality of parameter set groups is configured independently per search space for detection of the PDCCH,

wherein a parameter set group to which the specific parameter set belongs from among the plurality of parameter set groups is determined according to a search space in which the PDCCH is detected, and

wherein if the PDCCH carries a Transmit Power Control (TPC) command, a value indicated by the TPC command is accumulated for the specific parameter set only; and

control the RF unit to transmit a feedback signal for the downlink signal through a Physical Uplink Control Channel (PUCCH) based on the accumulated value for the specific parameter set.

10. The UE according to claim 9 , wherein the search space for detection of the PDCCH includes PDCCH candidate groups, and a parameter set group to which the specific parameter set belongs from among the plurality of parameter set groups is determined according to a PDCCH candidate group in which the PDCCH is detected.

11. The UE according to claim 9 , wherein the search space for detection of the PDCCH includes a specific subframe group, and a parameter set group to which the specific parameter set belongs from among the plurality of parameter set groups is determined according to a subframe in which the PDCCH is detected.

12. The UE according to claim 9 , wherein the search space for detection of the PDCCH is a UE-specific search space or a cell-specific search space, and a parameter set group to which the specific parameter set belongs from among the plurality of parameter set groups is determined according to whether the PDCCH is detected in the UE-specific search space or the cell-specific search space.

13. The UE according to claim 9 , wherein each of the plurality of parameter sets includes information about Physical Downlink Shared Channel (PDSCH) resource element mapping and information about a Quasi Co-Located (QCL) relationship between antenna ports.

14. The UE according to claim 9 , wherein each of the plurality of parameter sets includes at least one of information about the number of Cell-specific Reference Signal (CRS) antenna ports, information about a CRS frequency shift, information about a Multimedia Broadcast Single Frequency Network (MBSFN) subframe configuration, information about a zero-power Channel Status Information Reference Signal (CSI-RS) resource configuration, information about a PDSCH starting position, information about a CSI-RS resource configuration Identity (ID), information about a scrambling ID for generation of a UE-specific Demodulation Reference Signal (DMRS), information about a CSI-Interference Measurement (CSI-IM) resource, and information about an antenna port QCL type.

15. The UE according to claim 13 , wherein if the information about an antenna port QCL type indicates a specific type, each of the plurality of parameter sets further includes information about a cell ID corresponding to a CRS having a QCL relationship with a CSI-RS, the number of antenna ports, and an MBSFN subframe configuration.

16. The UE according to claim 9 , wherein each of the plurality of parameter sets includes at least one of information about an open-loop power control parameter for Physical Uplink Control Channel (PUCCH) transmission, information about mapping between the TPC command included in the PDCCH and the value indicated by the TPC command, information indicating whether PUCCH transmission using a plurality of antennas has been configured, information about a Timing Advance (TA) applied to PUCCH transmission, information about a cell ID for generation of a DMRS sequence for PUCCH transmission, information about a Sounding Reference Signal (SRS) transmission subframe, and information about an SRS transmission band.