LAUSR

A base station (BS) of the fifth generation (5G) cellular system can operate in high frequency band to obtain more bandwidth. The beamforming technology is a promising technique to relieve issues when operating in high frequency band. In this work, we assume that the BS equips with hybrid beamforming capability. Before disseminating downlink data to UEs, in every transmission time interval (TTI), the BS selects a set of user equipments (UEs), assigns radio resource blocks (RBs), and adjusts its analog and digital beamforming components. In this paper, we focus on designing medium access controller (MAC) layer approaches to assign radio resource to UEs. First, we formulate a linear programming formulation, which goal is to maximize network throughput. We then design an optimized solution to achieve the goal. However, when maximizing throughput, some UEs may be starved, and their downlink packets will be dropped due to the delay limit constraints of their downlink traffic flows. So, we further design a formulation to achieve fair scheduling with quality of service (QoS) considerations. We design a system profit model to facilitate fair radio resource scheduling. The simulation results indicate that the proposed solutions can indeed increase system throughput and reduce packet drop ratio.