Patent ID: 8254979
Filing Date: 2012-08-28
Classification: H04B,H04L,H04W

Abstract:
1. A communication system comprising a first radio communication apparatus and a second radio communication apparatus that includes a plurality of antennas, wherein: the first radio communication apparatus receives transmission signals that are transmitted from the plurality of antennas as reception signals, acquires a predetermined parameter for each of the antennas based on the reception signals, creates control information for causing the second radio communication apparatus to control the transmission signals so that the parameter becomes a predetermined target value for each of the antennas, compares absolute values of differences between each of the parameters that are acquired and the target value, and transmits control information corresponding to the reception signal for which the absolute value is large to the second radio communication apparatus with priority over control information corresponding to the reception signal for which the absolute value is small; the second radio communication apparatus receives the control information from the first radio communication apparatus, and controls a transmission signal of an antenna that is specified with the control information in accordance with an instruction of the control information; the first radio communication apparatus creates the control information for each of the antennas at predetermined periods, and transmits one or more pieces of the control information to the second radio communication apparatus within the period; and if a number of pieces of the control information that can be transmitted within the period is less than a number of pieces of the control information that are created, the first radio communication apparatus transmits only a number of pieces of the control information that can be transmitted within the period by giving priority to the control information corresponding to the reception signals for which the absolute value is large among the control information that are created, and cancels the remainder.