METHOD AND DEVICE FOR TRANSMITTING/RECEIVING CHANNEL STATE INFORMATION IN COORDINATED MULTIPOINT COMMUNICATION SYSTEM
First Claim
1. A method for transmitting CSI of multiple base stations from a user equipment, the method comprising:
- transmitting Channel State Information (CSI) including long-term-wideband Precoding Matrix Information (PMI) and short-term-subband PMI regarding a first base station;
transmitting CSI which includes long-term-wideband PMI regarding a second base station and does not include short-term-subband PMI regarding the second base station; and
transmitting CSI including the short-term-subband PMI regarding the second base station upon receiving a request for the short-term-subband PMI regarding the second base station.
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Accused Products
Abstract
The present invention relates to a wireless communication system. More particularly, disclosed are a method and a device for transmitting channel state information in a coordinated multipoint communication system. The method for transmitting channel state information from a terminal to multiple base stations, according to one embodiment of the present invention, comprise the steps of: transmitting the CSI including long-term broadband PMI and short-term sub-band PMI to a first base station; transmitting the CSI including the long-term broadband PMI and not including the short-term sub-band PMI to a second base station; and transmitting the CSI including the short-term sub-band PMI to the second base station, when a request for the short-term sub-band PMI transmission to the second base station is received.
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Citations
19 Claims
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1. A method for transmitting CSI of multiple base stations from a user equipment, the method comprising:
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transmitting Channel State Information (CSI) including long-term-wideband Precoding Matrix Information (PMI) and short-term-subband PMI regarding a first base station; transmitting CSI which includes long-term-wideband PMI regarding a second base station and does not include short-term-subband PMI regarding the second base station; and transmitting CSI including the short-term-subband PMI regarding the second base station upon receiving a request for the short-term-subband PMI regarding the second base station. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for supporting Coordinated Multi-Point (CoMP) communication in a first base station, the method comprising:
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receiving Channel State Information (CSI) including long-term-wideband Precoding Matrix Information (PMI) and short-term-subband PMI regarding the first base station and CSI which includes long-term-wideband PMI regarding a second base station and does not include short-term-subband PMI regarding the second base station from a user equipment; transmitting CSI regarding the second base station to the second base station; receiving a request for the short-term-subband PMI regarding the second base station from the second base station and providing the request to the user equipment; and receiving CSI including the short-term-subband PMI regarding the second base station from the user equipment and providing the CSI to the second base station. - View Dependent Claims (8, 9, 10, 11)
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12. A method for supporting Coordinated Multi-Point (CoMP) communication in a second base station, the method comprising:
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receiving Channel State Information (CSI) which includes long-term-wideband Precoding Matrix Information (PMI) regarding the second base station and does not include short-term-subband PMI regarding the second base station; transmitting a request for the short-term-subband PMI regarding the second base station upon determining that CoMP communication is to be performed with a first base station based on the CSI regarding the second base station; and receiving CSI including the short-term-subband PMI regarding the second base station. - View Dependent Claims (13, 14, 15, 16)
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17. A user equipment for transmitting Channel State Information (CSI) of multiple base stations, the user equipment comprising:
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a reception module for receiving a downlink signal from first and second base stations; a transmission module for transmitting an uplink signal to the first and second base stations; and a processor for controlling the user equipment including the reception module and the transmission module, wherein the processor is configured to transmit CSI including long-term-wideband Precoding Matrix Information (PMI) and short-term-subband PMI regarding a first base station through the transmission module, to transmit CSI which includes long-term-wideband PMI regarding a second base station and does not include short-term-subband PMI regarding the second base station through the transmission module, and to transmit CSI including the short-term-subband PMI regarding the second base station through the transmission module upon receiving a request for the short-term-subband PMI regarding the second base station through the reception module.
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18. A first base station supporting Coordinated Multi-Point (CoMP) communication, the first base station comprising:
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a reception module for receiving an uplink signal from a user equipment and receiving inter-base-station information from a second base station; a transmission module for transmitting a downlink uplink signal to the user equipment and transmitting inter-base-station information to the second base station; and a processor for controlling the first base station including the reception module and the transmission module, wherein the processor is configured to receive Channel State Information (CSI) including long-term-wideband Precoding Matrix Information (PMI) and short-term-subband PMI regarding the first base station and CSI which includes long-term-wideband PMI regarding the second base station and does not include short-term-subband PMI regarding the second base station from the user equipment through the reception module, to transmit CSI regarding the second base station to the second base station through the transmission module, to receive a request for the short-term-subband PMI regarding the second base station from the second base station through the reception module and provide the request to the user equipment through the transmission module, and to receive CSI including the short-term-subband PMI regarding the second base station from the user equipment through the reception module and provide the CSI to the second base station through the transmission module.
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19. A second base station supporting Coordinated Multi-Point (CoMP) communication, the second base station comprising:
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a reception module for receiving an uplink signal from a user equipment and receiving inter-base-station information from a first base station; a transmission module for transmitting a downlink uplink signal to the user equipment and transmitting inter-base-station information to the first base station; and a processor for controlling the second base station including the reception module and the transmission module, wherein the processor is configured to receive Channel State Information (CSI) which includes long-term-wideband Precoding Matrix Information (PMI) regarding the second base station and does not include short-term-subband PMI regarding the second base station through the reception module, to transmit a request for the short-term-subband PMI regarding the second base station upon determining that CoMP communication is to be performed with a first base station based on the CSI regarding the second base station through the transmission module, and to receive CSI including the short-term-subband PMI regarding the second base station through the reception module.
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Specification