无线能量收集驱动的铁路物联网中断性能分析  

Outage performance analysis of wireless powered railway Internet of things

作　　者：马佳星 熊轲 张煜 钟章队[2] 倪强 MA Jiaxing;XIONG Ke;ZHANG Yu;ZHONG Zhangdui;NI Qiang(School of Computer and Information Technology,Beijing Jiaotong University,Beijing 100044,China;State Key Laboratory of Rail Transit Control and Safety,Beijing 100044,China;State Grid Energy Research Institute Co.,Ltd.,Beijing 102209,China;School of Computing and Communications,Lancaster University,Lancaster LA14WA,United Kingdom)

机构地区：[1]北京交通大学计算机与信息技术学院,北京100044 [2]轨道交通控制与安全国家重点实验室,北京100044 [3]北京交通大学计算机与信息技术学院计算机工程系,北京100044 [4]国网能源研究院有限公司,北京102209 [5]兰卡斯特大学计算机与通信学院,英国兰卡斯特LA14WA

出　　处：《物联网学报》2020年第3期52-59,共8页Chinese Journal on Internet of Things

基　　金：中央高校基本科研业务费资助项目(No.2020JBZD010);国网能源研究院有限公司科技项目(No.SGNY202009014)。

摘　　要：基于铁路物联网场景分析了无线射频能量站(PB,power beacon)辅助的中继网络在莱斯衰落信道下采用半双工解码转发中继模式的系统中断性能。针对铁路场景中的设备供能问题,如电池更换困难、管理开销大、布线困难等,将无线能量收集应用于铁路场景,为能量受限的无线设备提供充足且稳定的能量,从而解决传统铁路中的设备供能问题。考虑网络中的源节点和中继节点均为能量受限节点,传输信息的能量都来自在列车上部署的PB发射的无线射频信号。源节点和中继节点先进行能量收集,利用收集的能量,源节点向中继节点发送信息,然后中继节点将接收的信息转发给目的节点。分析推导出了该网络端到端中断概率及吞吐量的闭合表达式。通过蒙特卡洛仿真验证了理论分析的正确性,并研究了PB发射功率与噪声的比值、莱斯因子K、时间分割因子、传输速率以及相对位置等因素对端到端中断概率和吞吐量的影响。当列车处于源节点和中继节点的中点位置时,系统可获得较优的中断和吞吐量性能。Based on the scenario of railway Internet of things,the system outage performance of the relay network was analyzed,which was assisted with the power beacon(PB),using the half-duplex decode-and-forward relay mode over the Rician fading channel.In view of the equipment supply problems in railway scenes,such as difficult battery replacing,high management overhead,difficult wiring,etc.,the wireless energy collection was applied to railway scenes,providing sufficient and stable energy for the energy-constrained wireless equipment,thus solving the equipment supply problems in traditional railways.Considering that the source node and the relay node in the network were energy limited nodes,and the energy of the information transmission came from the radio frequency signal transmitted from the PB deployed on the train.The source node and the relay node collected energy from the PB,and the source node sent information to the relay node by using the collected energy,and then the relay node forwarded the information received to the destination node.The closed-form expressions of the network end-to-end outage probability and the throughput were derived.The analytical results were demonstrated by Monte Carlo simulation.And based on this analysis,the impact of the ratio of transmitting power of the PB to noise,the Rician K-factor,the time switching factor,transmission rate and relative position on the end-to-end outage probability and throughput were studied.When the train is in the middle of the source node and the relay node,the system can obtain better outage and throughput performance.

关 键 词：能量收集 能量站 莱斯衰落信道 半双工 中断概率 吞吐量 铁路物联网 

分 类 号：TP212.9[自动化与计算机技术—检测技术与自动化装置]