Wireless powered communication network (WPCN) is a novel networking paradigmthat uses radio frequency (RF) wireless energy transfer (WET) technology topower the information transmissions of wireless devices (WDs). When energy andinformation are transferred in the same frequency band, a major design issue istransmission scheduling to avoid interference and achieve high communicationperformance. Commonly used centralized scheduling methods in WPCN may result inhigh control signaling overhead and thus are not suitable for wireless networksconstituting a large number of WDs with random locations and dynamicoperations. To tackle this issue, we propose in this paper a distributedscheduling protocol for energy and information transmissions in WPCN.Specifically, we allow a WD that is about to deplete its battery to broadcastan energy request buzz (ERB), which triggers WET from its associated hybridaccess point (HAP) to recharge the battery. If no ERB is sent, the WDs contendto transmit data to the HAP using the conventional $p$-persistent CSMA (carriersensing multiple access). In particular, we propose an energy queueing modelbased on an energy decoupling property to derive the throughput performance.Our analysis is verified through simulations under practical networkparameters, which demonstrate good throughput performance of the distributedscheduling protocol and reveal some interesting design insights that aredifferent from conventional contention-based communication network assuming theWDs are powered with unlimited energy supplies.
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机译：无线通信网络（WPCN）是一种新颖的联网范例，它使用射频（RF）无线能量传输（WET）技术为无线设备（WD）的信息传输提供动力。当能量和信息在同一频带中传输时，主要的设计问题是传输调度，以避免干扰并获得较高的通信性能。 WPCN中常用的集中式调度方法可能导致较高的控制信令开销，因此不适合用于构成具有随机位置和动态操作的大量WD的无线网络。为了解决这个问题，我们在本文中提出了一种用于WPCN中的能量和信息传输的分布式调度协议，特别是，我们允许即将耗尽其电池的WD广播能量请求蜂鸣声（ERB），从而触发WET与其关联的混合访问点（HAP）为电池充电。如果未发送ERB，则WD争用传统的$ p $持久CSMA（载波侦听多路访问）将数据传输到HAP。特别是，我们提出了一种基于能量解耦特性的能量排队模型以得出吞吐量性能。我们的分析通过在实际网络参数下的仿真进行了验证，该仿真证明了分布式调度协议的良好吞吐量性能，并揭示了一些与常规争用不同的有趣设计见解。的基础通信网络，假设WD由无限制的能源供电。
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