多信道车载网中基于时分多址的MAC改进算法
发布时间:2018-04-15 22:15
本文选题:车载网 + IEEE ; 参考:《电讯技术》2017年04期
【摘要】:车载网(VANETs)需提供时延敏感的安全应用和非安全应用的通信服务。这就使得媒体接入控制(MAC)协议既要满足安全消息的时延和可靠率,又要保证非安全消息的服务信道利用率,给MAC的设计提出了挑战。为此,提出基于时分多址的MAC改进算法(I-TDMA-MAC)。I-TDMA-MAC算法在每个同步帧内给每辆车分配两个子时隙,旨在提高无碰撞信道接入率和安全消息的传递率。同时,对空闲时隙采取重分配策略,并基于最短作业优先准则(SJF)给空闲时隙设置优先级,旨在提高服务信道利用率。仿真结果表明,提出的I-TDMA-MAC算法的安全消息传递率高达99%,当车流密度到达100 vehicle/km时,服务信道利用率接近于90%。
[Abstract]:Vehicular network (VANETs) is required to provide delay-sensitive security applications and non-secure applications of communication services.This makes the MAC protocol not only satisfy the delay and reliability of secure messages, but also guarantee the utilization of service channels of non-secure messages, which challenges the design of MAC.Therefore, an improved MAC algorithm based on time-division multiple access (TDMA) is proposed to allocate two sub-slots to each vehicle in each synchronous frame. The proposed algorithm aims to improve the access rate of collision free channel and the transmission rate of security messages.At the same time, the idle time slot is rescheduled, and the idle time slot is given priority based on the shortest job first criterion (SJF), in order to improve the utilization of service channel.Simulation results show that the proposed I-TDMA-MAC algorithm has a high security message delivery rate of 99%. When the traffic density reaches 100 vehicle/km, the service channel utilization rate is close to 90%.
【作者单位】: 河南广播电视大学信息工程学院;河南师范大学计算机与信息工程学院;
【基金】:国家自然科学基金资助项目(1404602) 河南省高等学校重点科研项目(15B520006) 河南省科技厅2017年科技攻关项目(172102210564) 国家开放大学2014年研究课题(G14A2402Y) 河南省教育厅2015年重点研究项目(15A520060)
【分类号】:TN929.5;U495
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本文编号:1756033
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