基于Veins的IEEE 802.11p性能仿真分析
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摘要
作为一种典型的VANETs(vehicular ad-hoc networks)通信协议,IEEE 802. 11p采用为低移动性网络设计的DCF作为基本传输机制,因此需要针对IEEE 802. 11p协议对于节点具有高速移动性的VANETs通信场景的适应性进行评估分析。首先基于测试评估的需求,构建了一种典型的VANETs通信场景;其次,考虑VANETs网络特点设定了场景中的信道模型和通信流量模型;然后,基于Veins平台搭建了仿真环境,并对仿真参数进行了配置;最后,以端到端延迟、丢包率和吞吐量作为评价标准,在Veins平台上仿真研究了传输频率、车流密度、车辆速度对IEEE 802. 11p网络性能的影响。仿真结果表明,网络因素和移动性因素共同影响IEEE 802. 11p的延迟性和可靠性;高传输频率不利于提高IEEE 802. 11p的网络性能;车辆速度对基于IEEE 802. 11p性能影响较大,而车流密度对其性能影响较小,并且在低速情况下,车流密度对IEEE802. 11p性能无显著影响。
As a typical communication technology for VANETs, IEEE 802. 11 p uses DCF as the basic transport mechanism,which is designed for low-mobility networks. Therefore, it is necessary to evaluate and analyze the adaptability of the IEEE 802. 11 p to VANETs communication scenarios with high mobility. Firstly,we construct a typical communication scenario for VANETs based on the requirements of test and evaluation. Secondly,we set the channel model and traffic flow model based on the characteristics of VANETs. Thirdly,we build a simulation environment based on Veins platform and configure the simulation parameters. Finally,we take end to end delay,packet loss rate and throughput as the evaluation criteria and study the effects of transmission frequency, traffic density and vehicle speed on the performance of IEEE 802. 11 p on the Veins platform. The simulation shows that network and mobility impacts the delay and reliability of IEEE 802. 11 p. High transmission frequency do not help to improve the performance of IEEE 802. 11 p. Speed has a great influence on performance of the IEEE 802. 11 p,while traffic density has little impacts. Traffic density has no significant effect on networks performance of IEEE 802. 11 p in low speed environment.
As a typical communication technology for VANETs, IEEE 802. 11 p uses DCF as the basic transport mechanism,which is designed for low-mobility networks. Therefore, it is necessary to evaluate and analyze the adaptability of the IEEE 802. 11 p to VANETs communication scenarios with high mobility. Firstly,we construct a typical communication scenario for VANETs based on the requirements of test and evaluation. Secondly,we set the channel model and traffic flow model based on the characteristics of VANETs. Thirdly,we build a simulation environment based on Veins platform and configure the simulation parameters. Finally,we take end to end delay,packet loss rate and throughput as the evaluation criteria and study the effects of transmission frequency, traffic density and vehicle speed on the performance of IEEE 802. 11 p on the Veins platform. The simulation shows that network and mobility impacts the delay and reliability of IEEE 802. 11 p. High transmission frequency do not help to improve the performance of IEEE 802. 11 p. Speed has a great influence on performance of the IEEE 802. 11 p,while traffic density has little impacts. Traffic density has no significant effect on networks performance of IEEE 802. 11 p in low speed environment.
引文
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[2] XIAO Yang. Performance analysis of priority schemes for IEEE 802. 11 and IEEE 802. 11e wireless LANs[J]. IEEE Transactions on Wireless Communications,2005,4(4):1506-1515.
[3] DENG D J,KE C H,CHEN H H,et al. Contention window optimization for IEEE 802. 11 DCF access control[J]. IEEE Transactions on Wireless Communications,2008,7(12):5129-5135.
[4]李骁驰.基于4G-LTE与WAVE的车联网无线通信平台构建与性能测试[D].西安:长安大学,2015.
[5]刘业,吴国新.基于802. 11p/WAVE的车联网连通性模型及其应用研究[J].通信学报,2013,34(6):85-91.
[6]步俊凌.车联网WAVE标准的原型及仿真研究[D].大连:大连理工大学,2014.
[7]李冉,贺体刚,赵明.移动通信网络的流量监测仿真研究[J].计算机仿真,2016,33(10):153-156.
[8] QUADROS C,SANTOS A,GERLA M,et al. QoE-driven dissemination of real-time videos over vehicular networks[J].Computer Communications,2016,91-92:133-147.
[9]赵睿,李春国,王海荣,等. Nakagami-m衰落信道下固定增益中继系统性能分析[J].电子学报,2011,39(1):162-167.
[10]王代华,宋林丽,王宇龙,等.平坦地面无线信道的大尺度衰落特性[J].计算机工程与设计,2012,33(6):2141-2145.
[11]马佳荣,赵祥模,马峻岩,等.基于VANET的高速公路事故消息快速广播机制[J].计算机工程,2015,41(11):8-12.
[12]江涌,谷建华,杜鹏雷,等.无线传感器网络测试平台研究[J].计算机技术与发展,2010,20(9):188-192.
[13]杨玲,陈其松,吴茂念.无线Mesh网络中路由与信道联合分配研究[J].计算机技术与发展,2014,24(7):110-115.
[14]陈立家,高伟.一种VANET信道丢包率模型[J].计算机工程与应用,2011,47(25):116-120.