Precoding weight generation method and control apparatus

摘要

A precoding weight generation method involves generating a channel matrix having channel state information transmitted as feedback from mobile stations undergoing spatial multiplexing for each cell that base stations manage, and generating precoding weights. When data transmission is targeted for a first mobile station that transmits the channel state information as feedback as well as transmits the channel state information to a weight generation target cell that is a target for generation of precoding weights, precoding weights are generated so as not to suppress interference on a second mobile station that transmits the channel state information as feedback as well as transmits the channel state information to the weight generation target cell, while suppressing interference on a third mobile station that does not transmit the channel state information as feedback except to the weight generation target cell.

主权项

1. A precoding weight generation method used for a plurality of base station apparatuses in coordinating and transmitting data to a plurality of mobile station apparatuses by Joint Transmission, comprising:
generating a channel matrix having, in matrix elements, channel state information transmitted as feedback from the plurality of mobile station apparatuses undergoing spatial multiplexing for each cell that each of the base station apparatuses manages; and generating precoding weights based on the channel matrix successively starting from a cell having the highest number of mobile station apparatuses that transmit the channel state information as feedback, wherein when data transmission is targeted for a first mobile station apparatus that transmits the channel state information as feedback to the plurality of base stations as well as transmits the channel state information to a weight generation target cell that is a target for generation of the precoding weights, the precoding weights are generated so as not to suppress interference on a second mobile station apparatus that transmits the channel state information as feedback to the plurality of base stations as well as transmits the channel state information to the weight generation target cell, while suppressing interference on a third mobile station apparatus that does not transmit the channel state information as feedback except to the weight generation target cell.