基于喷泉码信息差异分簇的V2V协作数据分发方案

Cooperative V2V-aided data distribution scheme based on fountain code information difference clustering

新兴车联网应用需要分发的数据量不断增加,车辆难以在一个RSU通信范围内收到完整数据,跨RSU通信完成率低,时效性差。针对此问题,提出一种基于喷泉码信息差异分簇的V2V协作数据分发方案。经过喷泉编码的数据由RSU广播;车辆通过XGBoots预测车速,以此计算V2V链路生存时间;链路可靠性和车辆的喷泉码信息差异构建引力模型来分簇,在簇内以V2V传输共享编码包,在保证完成率的前提下大幅降低数据分发延迟。仿真结果表明,与已有方案ECDS相比,对于不同大小的数据,该方案在保证完成率的基础上,平均时延降低了38%。

Because the distributed data of some emerging VANET applications is increasing,it is difficult for vehicles to receive the complete data when they pass through one RSU,which leads to low service completion rate and long delay.Aiming at this problem,a cooperative V2V-aided data distribution scheme based on fountain code information difference clustering was proposed.The data encoded by fountain code were broadcast to vehicles by RSUs.The vehicles predicted the vehicle speeds by XGBoots to calculate the V2V link lifetime and the gravity model was built based on link reliability and the difference of fountain code information of vehicles to cluster.The encoded packets were shared through cooperative V2V transmission in the clusters,which reduced the delay on the premise of ensuring the completion rate.Simulation results show that compared with the other scheme ECDS,the average delay of the proposed scheme is reduced by 38%for different sizes of data without reducing completion rate.