Abstract
The specific family of device-to-device (D2D) communication underlying downlink cellular networks eliminates the reliance on base stations for its transmission by allowing direct transmission between two devices in each other’s close proximity that reuse the cellular resource blocks for enhancing the attainable network capacity and spectrum efficiency. By considering downlink resource reuse and energy harvesting (EH), our goal is to maximize the sum-rate of the D2D links, without degrading the quality-of-service requirement of the cellular users. We formulated a sum-rate maximization problem of joint resource block and power allocation for the D2D links, which resulted in a non-convex problem that was then transformed into a more tractable convex optimization problem. Based on the results of our Lagrangian constrained optimization, we propose joint resource block and power allocation algorithms for the D2D links, when there is non-causal (offline) and causal (online) knowledge of the EH profiles at the D2D transmitters. The performance of the algorithms is quantified using simulation results for different network parameters settings, where our online algorithm performs close to the upper bound provided by our offline algorithm.
Highlights
One of the major concerns of cellular networks is the growing demand of tele-traffic that has been enormously increased with the spread of mobile devices and mobile multimedia services
We can observe that on average our on-line algorithm achieves 91% of the Online Algorithm sum-rate attained by our off-line algorithm. This is due to the fact that our off-line algorithm provides an upper-bound for the system, since it relies on the unrealistic assumption of non-causal knowledge of the energy harvesting (EH) process of the D2D links
Our results quantify the sum-rate of the D2D links as a function of the quality of service (QoS) threshold for the cellular users (CUs), of the number of CUs and of the D2D links as well as of the distance between the D2D pair for both the off-line and on-line EH processes at the D2D links
Summary
One of the major concerns of cellular networks is the growing demand of tele-traffic that has been enormously increased with the spread of mobile devices and mobile multimedia services. Device-to-Device (D2D) communication proves to be a promising local ad-hoc networking technology by virtue of its advantages, which include improving the area-spectral efficiency, offloading the tele-traffic of cellular base stations (BS), reducing the latency and expanding the BS’s coverage, etc. D2D communication underlaying cellular networks allows a pair of closely located devices to communicate directly with each other by reusing the frequency band allocated in the existing cellular networks [1], [2]. Conceiving efficient resource sharing schemes is essential for D2D communication, which have been studied in [3]–[8]. In [3], a maximum weight bipartite matching based scheme is designed for resource allocation for D2D to
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