Throughput and Energy Efficiency Maximization in Millimeter Wave - Micro Wave HetNets

Millimetre waves (mmwave) with enormous bandwidth and spectrum availability can fulfil the stringent requirement of future 5G networks. But there are many challenges to deploy mmWave. One of the biggest challenges is the line-of-sight (LOS). Heterogeneous networks (HetNets) supported by mmwave and microwave can resolve the problem of LOS. In this paper, we consider a HetNet supported with mmwaves and microwaves to achieve the challenging goals of 5G in a smart indoor factory. We formulate an optimization problem in terms of resource allocation and mode selection for HetNets, where the objective is to maximize the network energy efficiency and throughput. The formulated problem is the non-linear fractional programming problem. We propose the outer approximation algorithm (OAA) to solve the optimization problem. OAA is examined by extensive simulation work. The performance of β-optimal solution obtained by the OAA method is shown for different network parameters, such as the number of users and throughput of the network.