Channel Allocation Strategy based on Traffic Distribution in Ultra-Dense Networks

In ultra-dense network (UDN), although the capacity of the system can be increased by network densification, it leads to severe inter-cell interference, which has become a very important factor that affects the performances of the ultra-dense networks. Channel allocation is a common and effective means to mitigate inter-cell interference. Different from the previous channel allocation strategy, this paper considers the sub-channel allocation based on the traffic distribution under the network coverage area to improve the system throughput, and reduce the interference between SBSs. A graph theory-based clustering method is proposed to cluster small cells and assign sub-channels on this basis. Simulation shows that this scheme can reduce inter-cell interference, improve system throughput and the network performance effectively.