Resource Allocation for Underlaid Device-to-Device Communication by Incorporating Both Channel Assignment and Power Control

Device-to-Device (D2D) communication can greatly enhance the system throughput (ST) and individual quality-of-service (QoS) experience by reusing the spectrum of cellular network. But due to dense spectrum sharing, severe co-channel interference may be imposed between cellular links (C-links) and D2D links (D-links). So, to fully utilize the gain of D2D communication, we attempt to maximize the ST of D-links with guaranteed individual QoS requirement for both types of links by joint consideration of channel assignment (CA) and power control (PC). Specifically, particle swarm optimization (PSO) is explicitly adopted to optimize CA, but when deriving the fitness value for each CA particle, underlaid PC optimization will be implicitly performed for throughput maximization on each channel, together with a gradual removal (GR) scheme to maintain individual QoS requirement and admit the maximum number of D-links into the system. Thanks to the numerical results, we demonstrate the superiority of our scheme in terms of ST and system capacity (SC), i.e., The number of admitted D-links, when comparing with the ones in literature.