Rate-Optimal Power and Bandwidth Allocation in an Integrated Sub-6 GHz – Millimeter Wave Architecture

In millimeter wave (mmWave) systems, energy is a scarce resource due to the large channel losses and high energy usage by analog-to-digital converters. To mitigate this issue, we propose an integrated architecture that combines the sub-6 GHz and mmWave technologies. We investigate the power and bandwidth allocation jointly across the interfaces in order to maximize the achievable sum rate under power constraints. Our optimization formulation explicitly takes the components energy consumption into account, and our results show that despite the availability of huge mmWave bandwidth, it is optimal to utilize it partially under some circumstances.