A Distributed Ambient Backscatter MAC Protocol for Internet-of-Things Networks
A Distributed Ambient Backscatter MAC Protocol for Internet-of-Things Networks
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DOI：
10.1109/jiot.2019.2955909
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发表时间：
2020-02
影响因子：
10.6
通讯作者：
Xuelin Cao;Zuxun Song;Bofu Yang;Mohamed A. Elmossallamy;Lijun Qian;Zhu Han
中科院分区：
文献类型：
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作者：
Xuelin Cao;Zuxun Song;Bofu Yang;Mohamed A. Elmossallamy;Lijun Qian;Zhu Han
通过环境射频(RF)信号实现设备到设备(D2D)通信的环境后向散射通信显示了其在物联网(IoT)网络中的众多应用潜力。然而，由于超低功耗和超低成本的限制，针对后向散射通信的链路层研究还处于起步阶段，尤其是物联网后向散射通信系统中的信道接入协议更是鲜有提及。本文提出了一种分布式多址接入控制(MAC)协议，该协议允许多个后向散射设备(BD)依靠环境射频信号相互连接。通过将模拟信道侦听策略与双退避机制相结合，每个BD可以在发送、接收和能量收集(EH)状态之间切换。具体地说，一旦检测到信道忙，每个BD就开始EH的随机指定时间。当计时器到期时，BD停止EH并继续其感测和退避过程。考虑到感知过程中的虚警和漏检问题，建立了改进的3-D马尔可夫模型来分析该MAC协议的饱和吞吐量性能。大量的仿真验证了分析的正确性，并证明了所提出的反向散射MAC协议的优越性。
Ambient backscatter communication enabling device-to-device (D2D) communications via the ambient radio frequency (RF) signal has revealed its numerous application potential in the Internet-of-Things (IoT) networks. However, the work on the link layer for the backscatter communication is in its infancy due to the constraints of ultralow power and cost in such a system, especially a channel access protocol in the backscatter communication system for IoT networks is rarely mentioned. In this article, a distributed multiple access control (MAC) protocol is presented, which allows multiple backscatter devices (BDs) to connect with each other by relying on the ambient RF signal. By combining an analog channel sensing strategy with the dual-backoff mechanism, each BD can switch among the transmission, receiving, and energy harvesting (EH) states. Specifically, each BD starts a randomly designated time for EH once the channel is sensed to be busy. As the timer expires, the BD ceases the EH and continues its sensing and backoff procedures. With the consideration of the false alarm and the miss detection problems occurring while sensing, an enhanced 3-D Markov model is built to analyze the saturation throughput performance of the proposed MAC protocol. Extensive simulations verify the analysis and demonstrate the advantage of the proposed backscatter MAC protocol.