Wireless communication system, mobile terminal and collaborative communication method

摘要

A first base station receives from a mobile terminal identification information indicating a combination of a weight coefficient for the first base station and a weight coefficient for a second base station, transfers the received identification information to the second base station, and performs precoding of a data signal to be transmitted to the mobile terminal by collaborative transmission, by using the weight coefficient for the first base station identified by means of latest identification information. The second base station receives the identification information from the first base station, and performs precoding of a data signal to be transmitted by collaborative transmission, by using the weight coefficient for the second base station identified by means of identification information obtained as latest identification information and different from that for the weight coefficient for the first base station used for precoding of the data signal.

主权项

1. A wireless communication system in which at least a first base station and a second base station among a plurality of base stations transmit data signals to a mobile terminal by collaborating with each other,the first base station including:
a wireless receiving unit that receives from the mobile terminal identification information indicating a combination of a weight coefficient for the first base station and a weight coefficient for the second base station determined according to an estimated value of a propagation path condition between the first base station and the mobile terminal and an estimated value of a propagation path condition between the second base station and the mobile terminal; a transfer unit that transfers the identification information received by the wireless receiving unit to the second base station; and a first precoding unit that performs precoding of a data signal to be transmitted by collaborative transmission to the mobile terminal performed by the first base station and the second base station according to predetermined timing, by using the weight coefficient for the first base station identified by means of latest identification information in the identification information received by the wireless receiving unit,the second base station including:
an information receiving unit that receives the identification information transferred from the first base station; and a second precoding unit that performs precoding of a data signal to be transmitted by collaborative transmission together with the data signal transmitted from the first base station according to the predetermined timing, by using the weight coefficient for the second base station identified by means of identification information obtained as latest identification information in the identification information received by the information receiving unit and different from that for the weight coefficient for the first base station used for precoding of the data signal to be transmitted by collaborative transmission according to the predetermined timing.