VANET中利用未分配TDMA时隙协助重发数据的方法

发布时间：2018-03-09 21:14

本文选题：移动自组网　切入点：车载自组网　出处：《计算机研究与发展》2017年01期 　论文类型：期刊论文

【摘要】：车载自组网(vehicular ad hoc network,VANET)中的分布式TDMA方法通常多出没有被节点利用的空闲时隙,未能充分利用无线信道资源,且不能避免由于信道条件差所导致的丢包现象.与此同时,协助通信近年来引起了学术界和工业界的广泛关注,该方法利用了无线信道的广播特性,能够有效地修复信道,提高无线通信的可靠性.针对VANET应用场合,提出了一种MAC层数据协助重发方法,即协助分布式TDMA方法(cooperative distributed TDMA,Co-DTDMA).在Co-DTDMA中,如果源节点未成功发送数据,则附近的邻居节点利用未分配的空闲时隙协助重发源节点数据.与传统的协助通信方法不同,Co-DTDMA中的所有操作都以分布式方式进行,不依赖任何中心控制节点,因而适应于VANET应用场合.此外,Co-DTDMA仅利用未分配的空闲时隙协助重发数据,不影响网络中的正常数据传输.理论分析和仿真实验表明:Co-DTDMA显著地提高了数据成功接收概率,降低了数据传输时延.
[Abstract]:The distributed TDMA method in vehicle Ad hoc Network (VANET) usually has many idle time slots which are not utilized by nodes, fails to make full use of wireless channel resources, and can not avoid the phenomenon of packet loss caused by poor channel conditions. In recent years, assisted communication has attracted wide attention in academia and industry. This method utilizes the broadcast characteristics of wireless channel, can effectively repair the channel and improve the reliability of wireless communication. In this paper, a MAC layer data assisted retransmission method is proposed, that is, the distributed TDMA method can be used to facilitate the cooperative distributed TDMA-Co-DTDMA. In Co-DTDMA, if the source node does not send the data successfully, The neighbor nodes in the vicinity use unallocated idle time slots to assist in retransmitting the source node data. All operations in Co-DTDMA are distributed and do not depend on any central control node. In addition, Co-DTDMA only uses unallocated idle time slots to assist retransmission of data, and does not affect normal data transmission in the network. Theoretical analysis and simulation experiments show that the probability of successful data reception is significantly increased by the use of the Co-DTDMA. The data transmission delay is reduced.
【作者单位】：合肥工业大学计算机与信息学院;安徽大学计算机教学部;
【基金】：国家自然科学基金项目(61370088,61502142) 安徽省自然科学基金项目(1408085MKL80)~~
【分类号】：TN929.5;U495

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