Abstract
In the ultra dense network (UDN), user-centric virtual cell (VC) has been proposed to weaken the traditional concept of base station centric cell, where each user is served by several transmit points (TPs). The overlapped VCs in UDN will result in severe inter-VC interference and degrade the system throughput. Merging overlapped VCs can transform the serious inter-VC interference into intra-VC interference, which can be mitigated by designing beamforming. However, system complexity overhead will be high if all overlapped VCs are merged. Thus, how to balance the system complexity overhead and inter-VC interference is a key challenge. To solve this problem, this paper focuses on jointly merging overlapped VCs and designing) eamforming to maximize the system sum rate. Specifically, a virtual cell cluster (VC-cluster) formation algorithm based on a suitably defined overlapped TP ratio threshold is developed to repeatedly merge the overlapped VCs with maximum overlapped TP ratio. Then, an iterative beamforming algorithm based on a generalized weighted minimum mean square error approach is devised to mitigate interference of VC-clusters. Simulation results demonstrate that our scheme balances the system complexity and inter-VC interference, and achieves significant performance gain in system throughput.
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