Patent ID: 8340018
Filing Date: 2012-12-25
Classification: H04B,H04W

Abstract:
1. A wireless communication system, comprising: a plurality of mobile stations; and a plurality of base stations which receive downlink communication quality information feedback from the mobile stations, periodically select a mobile station of a data transmission destination with reference to the feedback downlink communication quality information, and transmit data to the selected mobile station, wherein: each of the base stations transmits in advance estimation pilot signals for estimating downlink communication qualities after processing spatial signals and after an elapse of a predetermined time set among the base stations; each of the mobile stations receives the estimation pilot signals to determine the downlink communication qualities, and notifies the base stations of the determined downlink communication qualities via uplinks; and wherein the transmission data transmitted to each of the mobile stations is first multiplexed with detection pilot signals which are used for receiving transmission data and then multiplexed with the estimation pilot signals by the base stations, wherein propagation times of transmission signals to a mobile station transmitted from a pair of the base stations located adjacent to each other are determined, and the estimation pilot signals are transmitted for a time period which is longer than a difference in the propagation times.