摘要
针对车载自组织网络(VANET)中的通信拥塞问题,提出一种结合和声搜索(HS)和禁忌搜索(TS)的VANET分布式拥塞控制方案。首先,周期性的检测信道使用率并判断拥塞;然后,以最小化延迟和延迟抖动为目标,以传输范围和传输速率的组合为解决方案,利用和声搜索算法进行全局搜索获得较优解,并作为禁忌搜索算法的初始解进行局部搜索,从而获得最优解;最后,车辆节点根据最优解调整各自的传输范围和速率来控制拥塞。实验结果表明,该方案能够有效的缓解拥塞现象、降低网络延迟并提高吞吐量。
For the issue of the congestion in vehicular ad hoc network(VANET),a distributed congestion control scheme for vanet based on harmony search(HS) and tabu search(TS) is proposed.Firstly,the channel utilization is detected periodically to determine the congestion.Then,minimization of the delay and delay jitter is considered as the target,and the combination of the transmission range and the transmission rate is considered as the solution of the problem.The harmony search is used for global search to obtain the better solution,and it is used as the initial solution for tabu search to make local search,so that it can obtain the optimal solution.Finally,the transmission range and the rate of vehicle nodes is adjusted so as to control the congestion.Experimental results show that the proposed scheme can effectively alleviate congestion,reduce network delay and improve the throughput.
引文
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