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SNR-Based TDMA Scheduling with Continuous Energy Transfer for Wireless Powered Communication Networks

机译：基于SNR的TDMA调度，用于无线动力通信网络的连续能量传输

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This paper studies SNR-based TDMA scheduling for a Wireless Powered Communication Network (WPCN). It is composed of a single Hybrid-Access Point (H-AP) which transfers energy wirelessly and collects data, and multiple terminal nodes. For H-AP operating in a half-duplex mode, it is not possible to do data collection from nodes and Wireless Energy Transfer (WET) simultaneously. Since only the first time slot is used for WET, the order of allocation of nodes to TDMA time slots does not affect the performance. On the other hand, for H-AP operating in a full-duplex mode that uses two antennas, one for continuous WET and the other for data collection, the scheduling order affects the performance and fairness. The reason is that a node allocated in a later time slot of the TDMA frame can harvest more energy than the nodes allocated in earlier time slot. Therefore, which order the node should be allocated in is an important issue. In this paper, we investigate the performance and fairness of WPCN when we change the scheduling order that is based on the SNR values of terminal nodes. The simulation results show that scheduling in descending order has maximum fairness, while scheduling in ascending order has maximum sum-throughput but less fairness. Considering the most important problem of WPCN, doubly near-far phenomenon, we conclude that the descending scheduling order can improve fairness significantly because nodes with lower SNR values harvest more energy compared to nodes with higher SNR values.
机译：本文研究了无线供电通信网络（WPCN）的基于SNR的TDMA调度。它由单个混合接入点（H-AP）组成，其无线传输能量并收集数据和多个终端节点。对于以半双工模式操作的H-AP，无法同时从节点和无线能量传输（湿）的数据收集。由于仅使用第一次时隙用于湿，因此节点分配给TDMA时隙的顺序不会影响性能。另一方面，对于以使用两个天线的全双工模式操作的H-AP，一个用于连续潮湿，另一个用于数据收集，调度顺序影响性能和公平性。原因在于，在TDMA帧的稍后时隙中分配的节点可以比在早期时隙中分配的节点收集更多的能量。因此，应该分配节点的顺序是一个重要问题。在本文中，我们在改变基于终端节点的SNR值的调度顺序时，研究WPCN的性能和公平性。仿真结果表明，降序调度具有最大公平性，同时按升序调度具有最大的总和吞吐量但不太公平。考虑到WPCN最重要的问题，双重近远的现象，我们得出结论，下降调度顺序可以显着提高公平性，因为与具有较高SNR值的节点相比，具有较低的SNR值的节点。

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