Device-to-device communication in cellular networks under statistical queueing constraints

Device-to-device (D2D) communication underlaid with cellular networks is a new paradigm, proposed to enhance the performance of cellular networks. By allowing a pair of D2D users to communicate directly and share the same spectral resources with the cellular users, D2D communication can achieve higher spectral efficiency, improve the energy efficiency, and lower the traffic delay. In this paper, transmission mode selection and resource allocation in a time-division multiplexed (TDM) cellular network with one cellular user, one base station, and a pair of D2D users is investigated under rate and queueing constraints. In particular, four possible modes are considered, namely the cellular mode, dedicated mode, uplink reuse mode, and downlink reuse mode. Using tools from stochastic network calculus, the system throughput under statistical queueing constraints is formulated, efficient resource allocation algorithms for all possible modes are proposed, and the influence of the positions of each node and the queueing constraints is analyzed via numerical results. Scenarios and conditions for different modes to be optimal in the sense of maximizing the sum-throughput are identified.