An Efficient Frequency Reuse Scheme by Cell Sectorization in OFDMA Based Wireless Networks

Abstract

A unique frequency reuse scheme by means of cell sectorization is proposed in this paper that reuses effectively a given frequency resource in a cellular environment. The key concept is to find a scheme that controls interferences among neighboring cells in a systematic manner while achieving high frequency reuse factor. Based on, user distribution in a cell, two problems are investigated. First, how to appropriately sectorize the cell such that the total received power and the total transmit power of all neighboring base stations is minimized and second is to get the most out of available frequency bandwidth. By using appropriate classification of available bandwidth into 8×4 frequency reuse plan, maximum inter-cell interference (ICI) is avoided when required signal-to interference- plus-noise ratio (SINR) is exceeding the required amount due to required modulation and coding. Hence, the proposed system can maintain ICI always at the minimum level, in turn achieving greater spectrum reuse efficiency in comparison with classic fractional frequency reuse (FFR) and soft frequency reuse (SFR) schemes. Finally, based on extensive computer simulations it is verified that the proposed reuse scheme shows good spectrum reuse efficiency while minimizing ICI.