| 摘要 |
The purpose of the present invention is to provide a tilt angle deciding method and a system wherein optimal tilt angles of base station antennas of the entire system can be obtained in the radio communication system. The method comprises the steps of setting initial values of tilt angles; calculating the deterioration rate at the initial values of flit angles (where deterioration rate is a ratio of points where reception power or quality is lower than a predetermined value within specified coverage); selecting an antenna for reducing a tilt angle; reducing the tilt angle of the selected antenna; calculating a deterioration rate at the time when the tilt angle is reduced; determining the continuity of repealing the processes; after repeating the series of processes for reducing these tilt angles, increasing tilt angles repeatedly in the similar way. In addition, the method comprises the steps of outputting tilt angles corresponding to the smallest deterioration rate, and determining whether the processes of repeating the whole steps ends. With the above-specified processes, it becomes possible to obtain tilt angles for diminishing the deterioration rate of the entire system in comparison with that obtained at initial values of tilt angles. |
