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A radio resource allocation scheme for multi-cell OFDMA downlink system is proposed, where dynamic resource allocation is realized at both radio network controller (RNC) and base stations (BSs). Different from other inter-cell interference (ICI) mitigation schemes in BSs which pay little attention to system traffic load distribution, the proposed algorithm is semi-distributed. RNC coordinates ICI of cell edge users (CEUs) based on traffic load at super-frame level, whereas BSs assign channels to each user at frame-level based on Proportional-fair (PF) scheduling and allocate power on each channel based on traffic load distribution. Simulations show that the algorithm yields better performance for data services under fast fading channel condition.
Date of Conference: 25-27 Oct. 2006