Joint optimization of channel allocation, link assignment and power control for device-to-device communication underlaying cellular network

Device-to-Device (D2D) communication has been proposed to facilitate cellular network with system capacity (SC) and quality of service (QoS). We consider the design of link assignment (LA), channel allocation (CA) and power control (PC) in D2D-aided content delivery scenario for both user fairness (UF) and system throughput (ST) under QoS requirement. Due to the complexity of the problem, we decompose it into two components: CA is formulated from graph perspective to mitigate severe co-channel interference, which turns out to be the Max K-cut problem; LA and PC are jointly optimized to utilize the gain achieved from CA for supreme performance, and specifically, genetic algorithm (GA) is adopted to optimize LA, but when deriving the fitness of each chromosome, PC optimization will be involved. Thanks to numerical results, we elucidate the efficacy of our scheme.