一种车联网分簇方法与簇内中继选择方法

摘要

针对车联网低时延、高可靠性的通信需求,提出了基于簇稳定的车辆分簇方法,有效增加通信时间,提高通信可靠性.在此基础上,研究功率受限的情况下车联网簇内数据分发的中继选择问题,提出了一种基于功率预分配的中继选择方法.该方法簇内车辆协作采用HDAF转发协议,在中继选择之前先对源节点和潜在中继节点进行功率分配,求取系统中断概率最小的功率分配因子,然后比较融入功率优化因子的各个节点的等效信道增益,选择出最优中继节点集合.数值结果表明:基于簇稳定的车辆分簇方法相比基于地理位置的分簇方法具有更高的稳定性.同时,提出的中继选择方法在相同条件下比传统的单中继选择方案和全中继选择方案具有更小的中断概率.%Vehicular Ad-Hoc networks(VANET) face with the requirements of high data rate and reliability.A clustering method based on stability was proposed to effectively increase communication time and reliability.Based on that,relay selection of data distribution in the vehicle cluster under the condition of limited power was studied.A relay selection method based on power pre-allocation is proposed.In this method,HDAF forwarding protocol is adopted in collaborative vehicles in cluster.Power allocation for source nodes and the potential relay nodes is done before real relay selection.Comparing the equivalent channel gain containing the power allocation factors to select the optimal relay nodes set,the numerical results show that the clustering method based on cluster stability has higher stability than the clustering method based on geographical location.At the same time,the proposed relay selection method has lower outage probability than traditional single relay amplify forward(SAF) and all relays amplify forward(AAF) under the same conditions.