Study on the Number and Size of Cells Composed of Multiple-Beam Transmission Base Station System

Abstract

In this paper, the authors investigate influence of the number of radiation beams and channel capacity given by their beam width in femtocell base station (BS) system assuming millimeter wave communication. This system radiates multiple beams from one BS and constructs a plurality of femtocells. This system aims at improving the channel capacity of the entire cover area by creating spots that can locally perform ultra-high-speed communication. To achieve this objective, however, the number of multiple beams emitting in the area and size of the cell are considered to be an important factor in system design. So, channel capacity obtained by end users is analyzed when beam width is changed according to the number of beams. Simulation result shows that more users can communicate at high-speed by increasing the number of beams. On the other hand, it has been clarified that the range of spots capable of high-speed communication decreases due to the necessity of narrowing the beam and the influence of side lobe interference as more cells are spread in the area.