学术论文

      车载自组网中基于分布式TDMA的协作数据重发方法

      Cooperative retransmission based on distributed TDMA for VANET

      摘要:
      为进一步利用车载自组网中分布式TDMA的节点空闲时隙资源,提出了一种分布式协作数据重发方法,即协作分布式TDMA (cooperative distributed TDMA,Co-DTDMA)方法.利用无线信道的广播特性与分布式TDMA的信道访问确定方式,Co-DTDMA中的信息交互过程能够以一种有序和确定的方式进行,在节点未成功发送数据时,附近的邻居节点利用自身空闲时隙进行协作数据重发,从而在不影响正常数据传输业务情形下,传输失败的数据拥有更多的发送机会.上述协作重发不依赖于中心节点,以分布式方式执行,因而适应车载自组网的应用场合.理论分析与仿真结果表明,Co-DTDMA显著提高了数据包发送成功概率,降低了数据包传输时延和丢包率,显著提高了网络可靠性.
      Abstract:
      To further utilize the idle time slots of the distributed TDMA (time division multiple address) for VANET (vehicular ad hoc networks), a distributed cooperative retransmission scheme, referred to as cooperative distributed TDMA (Co-DTDMA), is presented.Based on the broadcasting nature of wireless medium and the determinate way that the distributed TDMA accesses channel, nodes can interact with each other orderly and determinately in Co-DTDMA.When a node fails to transmit a packet, neighboring nodes exploit their idle slots for retransmitting the failed packet cooperatively, and thus the failed packet has more chance to be transmitted, without interrupting the normal packet transmissions.The cooperative retransmission does not rely on any central node, and is performed in a distributed manner, which makes it suitable for VANET.The numerical and simulation results demonstrate that Co-DTDMA significantly increases the probability of successful packet transmission, decreases the packet transmission delay and packet dropping rate, thus significantly increasing the network reliability.
      作者: 陈振 [1] 韩江洪 [2]
      Author: Chen Zhen [1] Han Jianghong [2]
      作者单位: 合肥工业大学计算机与信息学院,合肥230009;安徽大学计算机教学部,合肥230601 合肥工业大学计算机与信息学院,合肥,230009
      年,卷(期): 2017, 47(4)
      分类号: TP393.0
      在线出版日期: 2017年8月15日
      基金项目: 国家自然科学基金资助项目,安徽省自然科学基金资助项目