WIRELESS COMMUNICATIONS SYSTEM

PROBLEM TO BE SOLVED: To provide a wireless communications system where a service provider measures the radiation pattern of a base station antenna and automatically re-adjusts the radiation pattern by taking non-uniformity of an RF characteristic into account. SOLUTION: Measured values are collected and performance metric is derived from the measured values and analyzed in order to control an adjustable base station antenna. As examples of the adjustable base station antennas, a linear array antenna or a narrow beam antenna can be cited. The performance metric is derived from the measured values relating to sub-sectors in a sector of a service base station antenna. In order to conduct the correlation above, an approximate position of a mobile subscriber unit is decided from a measured time. A control signal sent to the adjustable base station antenna is calculated so that the performance metrics of sub sectors can be enhanced within a limitation to limit deterioration in the performance metric of the sub-sectors.