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This paper considers coordinated scheduling in multi-cell OFDMA systems. The authors propose a user-based adaptive joint channel assignment scheme. In the proposed scheme, all the cell-edge users from multiple cells are scheduled jointly while cell-centre users are scheduled in each individual cell. The method exploits both multi-user diversity and frequency diversity. It avoids the dominant inter-cell interference via the so called Assignment Table. To apply the algorithm in a large coordination set, a cell grouping method together with a group coordination method is also introduced. Simulation results show that the proposed scheme can increase considerably the average cell throughput compared with existing inter-cell interference coordination schemes.
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