认知车载网中基于协作的中继选择策略研究

摘要

为了优化认知车载网的系统性能,提出了一种基于协作的中继选择方案来保障车载通信用户间数据传输的有效性和可靠性.考虑到中继节点的引入同时也会导致干扰范围的扩大,从而影响到其它链路的正常通信.为此,通过构建中继节点选择区域模型,研究了中继节点选择区域的角度以及通信范围内中继节点的密度对网络性能所产生的影响,通过合理地设置中继选择区域的参数,能够减少协作通信所带来的负面效应.性能分析和仿真结果表明,所提出的算法能显著降低车辆节点间通信的中断概率,提升通信链路的稳定性和可靠性,因而能够有效地应用于车载网络环境中.%Considering the optimization of system performance in cognitive radio vehicular ad-hoc network (CR -VANET),a relay selection strategy based on cooperation was proposed to guarantee the validity and reliability of data transmission between vehicular communication users.Besides,in consideration of the relay nodes which participate in cooperation communication,the interference range of communication was also considered which may interrupt the communication between other nodes.Hence,the influence of the angle and the density of relay nodes were discussed by constructing a model of relay nodes selection region and the negative effect of cooperation communication can be decreased by setting appropriate parameters in relay node selection region.Performance analysis and simulation results show that the proposed algorithm can evidently reduce the outage probability of communication and enhance the validity and reliability of the communication links.Thus,it can be effectively applied into vehicular environments.