Effect of cluster rotation speed in coordinated heterogeneous MIMO cellular networks with proportionally fair user scheduling

The effect of how often clustering patterns change within a previously proposed rotating clustering scheme on the average achievable downlink rates of a coordinated heterogeneous multicell multiple-input multiple-output (MIMO) system is investigated in this paper. Rotating the base station cluster patterns allows users to be nearer the cluster center in at least one of the patterns. Faster cluster rotation results in users being nearer the center more often. The performance of the system with different cluster rotation rates is evaluated, using a simulated annealing user scheduling algorithm with a proportionally fair metric. Simulations demonstrate there is a maximum speed of rotation, above which negligible further gains in performance are achieved compared to fixed clustering.