A system level evaluation of vertical sectorization for active antenna system

Abstract

Active antenna system (AAS) is a system with features the ability of advanced beam-forming techniques to take full advantage of spatial freedom in cellular network deployment, which enables improvement in network capacity and coverage. One of recent applications for AAS is vertical sectorization where the conventional sector is split into two vertical sector, i.e. inner sector and outer sector. The user equipment (UE) connects to the better serving sector based on the level of received power. In this paper, the performance of massive multi-input multi-output (MIMO) system for vertical sectorization in terms of different inner sector downtilt and the ratio of the power transmitted by outer sector to power transmitted by inner sector are presented, the results have shown that when the difference of between downtilt of inner beam and downtilt of outer beam is varied to a fixed angle, the performance achieves a maximum level, and the power ratio of inner sector to outer sector is also crucial factor that impact on vertical sectorization system performance, simulation results demonstrate that the best performance can be achieved when the power ratio equal to 1.