VANET中基于非时隙CSMA/CA机制的IEEE802.15.4性能评估  

Performance Evaluation of IEEE802.15.4 Based on Unslotted CSMA/CA for VANET Applications

作　　者：刘小春[1,2] 胡晓娅 张蕾 杨梦勤[1] LIU Xiao-chun;HU Xiao-ya;ZHANG Lei;YANG Meng-qin(School of Railway Charging and Electric,Hunan Railway Professional Technology College,Zhuzhou 412001 China;School of Automation,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]湖南铁道职业技术学院轨道交通智能控制学院,湖南株洲412001 [2]华中科技大学自动化学院,湖北武汉430074

出　　处：《数学的实践与认识》2019年第14期168-180,共13页Mathematics in Practice and Theory

基　　金：湖南省教育厅科学研究项目“多跳无线传感器网络中混合MAC机制研究”(17C1042)

摘　　要：IEEE 802.15.4是一个潜在的标准,可以在基于无线传感器网络的车载自组织网络(VANET)应用中提供高效和高质量的车辆到基础设施通信.在本研究中,提出了一种基于非时隙载波侦听多路访问和冲突避免机制的IEEE 802.15.4的数学模型,以研究介质访问协议在车载通信场景中的性能,该通信过程通过采用伯努利反馈重试的M/G/1排队系统建模,来分析其可靠性、受冲突影响的数据包延时和物理层中的数据丢失.模型分析结果与蒙特卡罗模拟的结果一致,适用于交通流量大和冲突概率高的情况.IEEE802.15.4 is a potential standard that can provide efficient and high-quality vehicle-to-infrastructure communication at cost-effective and low data rates in wireless sensor network-based vehicular ad-hoc network applications.In this study,a mathematical model of IEEE 802.15.4 based on the unslotted carrier sense multiple access with collision avoidance mechanism was proposed to investigate the performance of the media access protocol for vehicular communication scenarios.The communication process was modeled as an M/G/1 queuing system with Bernoulli feedback retrial to analyze reliability,packet delay with the influence of collision,and packet loss in the physical layer.The model predictions are consistent with the results of Monte Carlo simulation for a wide range of traffic flows and collision probabilities.

关 键 词：伯努利反馈 IEEE802.15.4 M/G/1排队模型 非时隙载波侦听多路访问 车辆通信 

分 类 号：U463.6[机械工程—车辆工程]