Energy-Efficient Subchannel Allocation Scheme Based on Adaptive Base Station Cooperation in Downlink Cellular Networks
An Inter-Cell Interference (ICI) problem between cochannel BSs has been one of main challenging research issues in downlink cellular networks. Fractional Frequency Reuse (FFR) and BS cooperation are useful techniques to manage the ICI problem. By combining the BS cooperation and FFR techniques, the authors propose to determine an efficient cooperation mode and the type of subchannels, i.e., reusable subchannels or exclusively used subchannels. The optimization problem to minimize the total power consumption in a cooperative cluster is formulated while satisfying a given constraint in terms of the number of subchannels.