Capacity-Oriented Resource Allocation for Device-to-Device Communication Underlaying Cellular Networks

Future radio communication systems become user-centric and lay more emphasize on individual quality-of-service (QoS) experience than system-wide performance. Being a potential component, Device-to-Device (D2D) communication underlaying cellular network attracts great attention and explores the proximate gain residing in local communicating pairs, but co-channel interference is inevitable between D2D links (D-Ls) and the existing cellular links (C-Ls), and the design of resource allocation should be addressed. So, we are dedicated to balancing the performance tradeoff between the system capacity (SC) of D-Ls, i.e., the number of admitted D-Ls with satisfied QoS requirement, and their system-wide metric, e.g., energy conservation, system throughput, energy efficiency, and the minimum individual data rate, and we specify our optimization model to enhance the system-wide metric on condition that the SC is maximized and the QoS requirement of prioritized C-Ls is also strictly guaranteed. Finally, a two-step mechanism is proposed: In step one, we devise a joint admission control and channel assignment scheme for SC maximization from graph perspective. In step two, we further incorporate power control of the D-Ls admitted in previous step for supreme system-wide metric. With the help of numerical results, we demonstrate the necessity to weight the above performance tradeoff and elucidate the efficacy of our mechanism.