Cooperative communication method in cellular wireless communication system and terminal for performing the method

Abstract

Provided is a coordinated communication method in which a plurality of cells cooperate to perform multi-antenna transmission and reception in a cellular wireless communication system. A terminal wirelessly transmits channel state information (CSI) feedback to a serving cell and at least one coordinating cell. The serving cell and the coordinating cell perform multi-point coordinated communication using the CSI feedback. Even if the serving cell and the coordinating cell belong to different base stations, information exchange between the cells is minimized, so that a transmission delay and a traffic increment of a backhaul network can be prevented.

1 . A coordinated communication method of a serving cell in a cellular wireless communication system including the serving cell and at least one coordinating cell, comprising:
 receiving a measurement result on signals of neighboring cells from a terminal;   transmitting information about the at least one coordinating cell to the terminal, wherein the at least one coordinating cell is determined among the neighboring cells by the serving cell based on the measurement result;   receiving channel state information (CSI) feedback from the terminal; and   transmitting data to the terminal through a coordinated communication performed by the serving cell and the at least one coordinating cell using the CSI feedback received from the terminal.   
     
     
         2 . The coordinated communication method of  claim 1 , further comprising:
 notifying the at least one coordinating cell of information about the CSI feedback and downlink scheduling information of the terminal.   
     
     
         3 . The coordinated communication method of  claim 1 , further comprising:
 transmitting, to the terminal, antenna port information of the serving cell and antenna port information of a neighboring cell around the terminal.   
     
     
         4 . The coordinated communication method of  claim 3 , wherein the antenna port information includes the number of antenna ports and location information of a reference signal used for acquisition of the CSI in a time-frequency resource space per each antenna port. 
     
     
         5 . The coordinated communication method of  claim 3 , wherein the transmitting antenna port information of the serving cell and antenna port information of a neighboring cell around the terminal comprises transmitting the antenna port information to the terminal through a radio resource control (RRC) message. 
     
     
         6 . The coordinated communication method of  claim 2 , wherein the information about the CSI feedback includes at least one of a location of an uplink resource used for the CSI feedback and a feedback transmission format necessary for demodulation, and the downlink scheduling information of the terminal includes a location of a downlink resource through which data is transmitted to the terminal. 
     
     
         7 . A coordinated communication method of a coordinating cell in a cellular wireless communication system including a serving cell and the coordinating cell, comprising:
 receiving a measurement result on signals of neighboring cells from a terminal;   receiving channel state information (CSI) feedback from the terminal; and   transmitting data to the terminal through a coordinated communication performed by the serving cell and the coordinating cell using the CSI feedback received from the terminal,   wherein the coordinating cell is determined among the neighboring cells by the serving cell based on the measurement result, and information about the coordinating cell is transmitted from the serving cell to the terminal,   
     
     
         8 . The coordinated communication method of  claim 7 , further comprising:
 receiving, from the serving cell, information about the CSI feedback and downlink scheduling information of the terminal.   
     
     
         9 . The coordinated communication method of  claim 8 , wherein the information about the CSI feedback includes at least one of a location of an uplink resource used for the CSI feedback and a feedback transmission format necessary for demodulation, and the downlink scheduling information of the terminal includes a location of a downlink resource through which data is transmitted to the terminal. 
     
     
         10 . The coordinated communication method of  claim 7 , further comprising
 receiving, from the terminal, information about the CSI feedback and downlink scheduling information of the terminal when there is interference between femto cells.   
     
     
         11 . The coordinated communication method of  claim 10 , wherein the information about the CSI feedback includes at least one of a location of an uplink resource used for the CSI feedback and a feedback transmission format necessary for demodulation, and the downlink scheduling information of the terminal includes a location of a downlink resource through which data is transmitted to the terminal. 
     
     
         12 . The coordinated communication method of  claim 7 , wherein antenna port information of the serving cell and antenna port information of a neighboring cell around the terminal are transmitted from the serving cell to the terminal. 
     
     
         13 . The coordinated communication method of  claim 12 , wherein the antenna port information includes the number of antenna ports and location information of a reference signal used for acquisition of the CSI in a time-frequency resource space per each antenna port. 
     
     
         14 . The coordinated communication method of  claim 12 , wherein the transmitting antenna port information of the serving cell and antenna port information of a neighboring cell around the terminal comprises transmitting the antenna port information to the terminal through a radio resource control (RRC) message.