Downlink Coordinated Beamforming Policies for 5G Millimeter Wave Dense Networks

A key technology of the upcoming Fifth Generation (5G) networks, which is expected to crucially affect the achieved system capacity, is Coordinated Multipoint (CoMP), where multiple base stations collaborate with each other to mitigate inter-cell interference. In this paper, a Coordinated Beamforming (CB) CoMP policy for dense fixed-wireless millimeter wave networks is presented. The policy, which is based on a standard stochastic optimization methodology, explicitly accounts for realistic antenna radiation patterns and stochastic packet arrivals, in addition to channel state fluctuations. It performs both user scheduling as well as proper radiation pattern selection in order to control interference and can be easily extended to include additional MAC and PHY layer controls. For comparison purposes, two other round-robin policies are proposed. Simulation results indicate that the proposed CB policy is able to achieve a throughput gain up to 2X per user.