Coverage extension and power optimization for closed group femto cells in BWA network

In today´s world 70-90% wireless communication occurs inside the building area. However, due to high wallpenetration loss the signal quality falls below the desired level. Therefore, low power femto base stations are deployed inside the buildings to enhance the indoor coverage and signal strength. In this paper, we have considered a building area located at the cell edge. In the first part of the paper, we have observed the variation of signal to interference plus noise ratio (SINR), packet loss rate and throughput for varied user density and number of channels. However, a huge number of femto cells may create significant amount of interference. Hence, the effect of the interference scenario is discussed and a power optimization algorithm to reduce the cross layer interference is proposed in the rest of the paper. After deploying power optimized femto cells, it is observed that the signal quality within the building has improved significantly.