摘要
车载自组织网络在智能交通系统中具有广泛应用前景,成为近年来研究的热点。无线网络MAC协议保证了终端公平有效地共享无线信道。由于VANET网络自身特点,现有MANET网MAC协议并不能直接应用于VANET网中。本文首先简要介绍了MANET中的CSMA、MACA和IEEE802.11协议原理,然后通过仿真的方法比较了在点对点和隐藏暴露状态下的吞吐量与时延特性,得出基于IEEE802.11的改进型MAC机制能更好适应车载环境的结论。
VANET is becoming a research hotspot which has wide application in Intelligent Transportation System （ITS） in recent years. MAC is indispensable to ensure that the nodes fairly and efficiently share the wireless medium. Since the specific characteristics in VANET, only few MAC protocols design for MANET can be adapted to VANET directly. The main MAC protocols for MANET including CSMA, MACA and IEEE802.11 are briefly introduced, and then the property of throughput and time delay with the condition of P2P and hidden and exposed problem is analyzed by the method of simulation. Finally, improved mechanism based on IEEE802.11 can adapt to the VANET environment better.
出处
《江苏理工学院学报》
2009年第3期27-31,共5页
Journal of Jiangsu University of Technology
基金
江苏技术师范学院青年基金项目(KYY08038)
