Joint Beam Allocation for Massive MIMO Basestations With Positioning Information

Massive multiple input multiple output (MIMO) antennas can generate narrow and high-gain beams to overcome the severe propagation loss and accurately locate the users. However, even with MIMO, the space resources provided by the basestations (BSs) are still limited. This motivates the study of the collaboration of multiple BSs with massive MIMO antennas, which has the potential to efficiently exploit the space resources and reduce the inter-user interference. In this paper, we study the joint beam allocation of multiple BSs based on the positioning information. We assume that several users are randomly located in a circular area, and one or two BSs are available to serve the users. If two users are in the same beam of a BS, the signals from the BS to these users would interference with each other. To avoid the inter-user interference, we propose the beam allocation scheme for the users based on their position information. Further, we derive the closed-form probability of no inter-user interference for one or two BSs. Simulation and analytical results show that the joint beam allocation of two BSs can reduce the inter-user interferences compared with just exploiting one BS.