Abstract
Device-to-device (D2D) communication can improve coverage, spectrum efficiency, and energy efficiency based on the current cellular network architecture. The fair scheduling for D2D communication in the orthogonal frequency division multiple access-based cellular network is studied in this paper. Based on the proportional fairness criteria, the optimization objective is formulated to maximize the sum of the relative achievable rate of both cellular users (CUs) and D2D pairs. It is a hybrid optimization problem since it involves in both the resource reuse and the transmit power control. A practical proportional fairness scheduling (PFS) algorithm is proposed. Firstly, the admissible area is decided according to the transmit power limitation of terminals and the quality of service (QoS) requirement. Next, we seek the optimal transmit power combination for the CU and D2D pair in the admissible area and it is demonstrated that the optimal value can be selected from several points on the border of the admissible area. Lastly, when multiple subchannels can be employed for scheduling, based on the generated bipartite graph, Hungarian algorithm is adopted to realize maximum matching, i.e., select reusable CUs and D2D pairs to maximize the sum of the relative achievable rates. The simulation results show that PFS algorithm can guarantee the excellent performance of both throughput and fairness.
Highlights
Device-to-device (D2D) communication refers to the direct communication between proximity terminals without the involvement of the base station
Interference control for D2D communication appears to the natural extension of that for traditional cellular communication, the key difference lies in the predefined quality of service (QoS) guarantee required for cellular users (CUs)
Without enforcing the QoS constraints in the throughput maximization, the D2D user is allocated to more resources for its short-distance transmission and better transmission conditions, which causes the unfairness for CUs [3]
Summary
Device-to-device (D2D) communication refers to the direct communication between proximity terminals without the involvement of the base station. The current research on the proportional fairness scheduling of the CUs and D2D pairs is usually simplified by some additional limitations, e.g., just the proportional fairness for CUs or the fixed transmit power for the CU Inspired by these works, we present a framework of resource allocation for D2D communications underlaying cellular networks to maximize the sum of relative achievable rate of the CUs and D2D pairs while guaranteeing the QoS requirement of both CUs and D2D pairs. Information reporting and resource request message, has to be paid; the fully centralized scheduling method implemented by the BS can better match CUs and D2D pairs; and the appropriate resource allocation and power control can improve the transmit efficiency for the traffic data. When the normalized bandwidth is employed, the achievable rate for CU i and D2D pair j can be written as ÀÁ
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