基于边缘计算的车联网中数据回传新方法

New method of data backhaul in internet of vehicles based on edge computing

针对车联网中数据回传时,由于车辆的移动特性以及路边单元和车辆有限的通信范围,车辆在计算任务完成前已经驶离RSU通信范围而面临的回传选择问题,提出基于V2I直传和V2V辅助传输的新方法.首先,通过对车辆的移动、回传数据量、最大传输时延以及链路有效寿命进行估算,判断使用何种传输策略.其次,在设计辅助传输策略时综合考虑车辆的速度、方向、位置等因素,并将这些因素用稳效值来衡量.在构建回传链路时采取贪婪选择方式,选择稳效值最大的邻居节点作为中继节点.实验表明,本文提出的回传策略相比其他算法在传输时延和包交付率方面有更好的效果.

Due to the mobile characteristics of vehicles and the limited communication range between roadside units and vehicles during the data backhaul in internet of vehicles, sometimes vehicles leave the communication range of RSU before the completion of the calculation task. To address this problem of data backhaul choices, this paper proposes a new method based on V2 I direct transmission and V2 V auxiliary transmission. First, which transmission strategy to be used is determined by estimating the vehicle movement, the amount of data returned, the maximum transmission delay, and the effective life of the link.Then, when designing the auxiliary transmission strategy, factors such as the speed, direction, and position of the vehicle are comprehensively considered, and these factors are measured in terms of steady-state values. The greedy selection method is adopted when constructing the backhaul link, and the neighboring node with the largest steady-statevalue is selected as the relay node. Experimental results show that the backhaul strategy proposed in this paper has better performance than other algorithms in terms of transmission delay and packet delivery rate.