Fundamental characteristics of combined tilting base station antenna by field trials

Abstract

In the cellular mobile communication systems using sectored cell configurations, reducing the back-lobe interference of the base station (BTS) sector antenna that arrives at the other sectors in the same cell is very important to improve the Signal to Interference power Ratio (SIR) and thus cell throughput. Setting the beam tilt angle of the back-lobe deeper than that of main-lobe for the BTS sector antenna greatly reduces the back-lobe interference. We investigated the combined beam tilting method in order to realize the function by simulation in the previous work. In this paper, we clarify the improvements in SIR possible when applying the combined tilting technique to cellular systems by field trials in a rural cell near Tokyo.