User Association and Resource Allocation Algorithm of Base Station in Multi-Band Millimeter Wave Heterogeneous Cellular Networks

Network densification is a key technology to meet the rapid growth of 5G traffic. Millimeter wave has rich spectrum resource, short propagation distance and obvious directivity. Therefore, the dense millimeter wave network can reduce co-frequency interference and improve network capacity. To make full use of spectrum resource, this paper proposes a user association algorithm in multi-band millimeter wave network, which maximizes the weighted total rate of network while meeting the requirement of users and backhaul bandwidth constraint of base stations (BS). To enrich resource management method of network, the resource proportion of BS allocated to each user is also jointly optimized. For the mixed integer optimization problem which is difficult to solve after modeling, we adopt penalty function and Marks–Wright algorithm to obtain solution. Simulation results show that compared with three similar algorithms, the proposed scheme can rationally utilize network resource, avoid load imbalance, and has the highest total rate of network.