Beam Management Based Multi-cell Interference Suppression for Millimeter Wave Communications

Millimeter wave (mmWave) communications is a promising solution for next-generation systems with a higher data rate. However, due to the narrow beamwidth characteristic of mmWave, inter-cell interference (ICI) is mainly caused by beams used by neighboring cells. In this paper, we aim to maximize the achievable sum rate of users at a mmWave cell in the downlink communication scenario of multi-cell systems. Since the formulated problem is a mixed-integer nonlinear programming problem, we decompose the problem into two subproblems, where one is solved by a multi-cell least beam interference (MLBI) algorithm to mitigate such ICI. And another is to guarantee edge users’ (UEes’) Quality of Service (QoS) and improve the achievable rate through a multi-user multi-beam prioritized power allocation (MPPA) algorithm. Finally, simulations and analyses are conducted to verify the efficiency of the proposed algorithms.