1 Decentralized Intercell Interference Coordination in Uplink Cellular Networks using Adaptive Sub-band Exclusion

Abstract — In this paper, we proposed an adaptive sub-band exclusion (ASE) scheme as a means of intercell interference coordination (ICIC) technique to improve the performance of wireless cellular systems in a decentralized manner. It excludes some portion of orthogonal frequency division multiplexing (OFDM) sub-bands inducing the most significant interference to othercell base staions (BSs). Moreover, the scheme determines the exclusion ratio according to how much intercell interference the MS induces to its neighbor cells. Since ICIC is done at each MS, the proposed ASE scheme can be called a decentralized ICIC scheme. Compared to conventional centralized ICIC schemes, our decentralized ASE scheme has the following advantages: cell and user coordinations are easier in our decentralized scheme, the complexity of ICIC at BSs is reduced, and more detailed othercell interference characteristics, such as frequency selectivity, can be used in ICIC. Through extensive computer simulations, we show that the proposed ASE scheme is effective in improving cell edge user performance by eight times at a reasonable degradation of average user performance. I