车辆通信接入系统的自适应传输模式选择策略

发布时间：2018-05-19 03:12

本文选题：智能交通系统 + 车辆通信接入系统　；参考：《交通运输工程学报》2014年01期

【摘要】：为提高智能交通系统(ITS)有效传输各类信息服务流的能力,将自适应调制编码(AMC)和正交频分多址接入(OFDMA)技术引入车辆通信接入子系统,提出了一种自适应传输模式选择策略。当车辆行驶在非特殊地理区域或行驶速度低于60km·h-1时,车辆通信接入系统将启动自适应传输模式选择进程。与典型策略采用固定不变的AMC传输模式信噪比切换阈值相比,建议策略的切换阈值可变,且由ITS信息服务流目标分组差错率来决定,从而使系统在传输不同类型的ITS信息服务流时,有可能在相同的接入信道状况下采用不同的调制编码模式等级,进而获得更高的数据有效传输速率。通过数学分析对选择策略的各类服务流目标分组差错率和系统平均有效数据传输速率进行性能评估。分析结果表明:建议策略能够在传输可靠性和高效性之间做出更好的权衡;当第1、2、3类ITS信息服务流的目标分组差错率分别为10-6、10-5、10-2时,建议策略能够在满足传输可靠性要求的同时,将典型策略的系统平均有效数据传输速率提升8%。
[Abstract]:In order to improve the ability of intelligent transportation system (ITS) to transmit all kinds of information service flow effectively, adaptive modulation coding (AMC) and orthogonal frequency division multiple access (OFDMA) technology are introduced into the vehicle communication access subsystem, and an adaptive transmission mode selection strategy is proposed. When the vehicle is traveling in a non-special geographical area or at a speed lower than 60km h-1, the vehicle communication access system will start the adaptive transmission mode selection process. Compared with the typical AMC transmission mode switching threshold, the switching threshold of the proposed strategy is variable and determined by the packet error rate of the ITS information service flow target. Therefore, it is possible for the system to adopt different modulation and coding mode levels in the same access channel when transmitting different types of ITS information service streams, thus obtaining higher effective data transmission rates. Through mathematical analysis, the performance of packet error rate and average effective data transmission rate of various service flow targets for selecting policies are evaluated. The analysis results show that the proposed strategy can make a better trade-off between transmission reliability and high efficiency. When the target packet error rate of the first class of ITS information service flow is 10-6 / 10 ~ (-5) / 10 ~ (-2), the proposed policy can satisfy the requirement of transmission reliability at the same time. The average effective data transmission rate of the typical system is increased by 8%.
【作者单位】：长安大学信息工程学院;长安大学电子与控制工程学院;
【基金】：国家自然科学基金项目(51278058,61302150) 长江学者和创新团队发展计划项目(IRT0951) 国家物联网重大示范工程项目(2012-364-812-105) 陕西省自然科学基金项目(2013JQ8044) 中央高校基本科研业务费专项资金项目(CHD2011JC159,CHD2011JC056,2013G3243002,2013G1502068)
【分类号】：TN929.5

【共引文献】