基于连接概率的VANETs路由协议研究

摘要

The communication connection among vehicles of the vehicular Ad Hoc networks(VANETs)is analyzed in this paper. It is assume that the time interval for the vehicles entering into the highway is subordinated to Poisson distribution,and then performance of the communication connection among vehicles is analyzed. The closed⁃form expression of communication connection probability composed of n vehicles is deduced,and the expectation values of CLS (cluster size) and CLL (cluster length) to maintain a certain connection probability are analyzed. The impact of transmission range and density of vehicles on the connection is discussed. The critical value of vehicles′ transmission range which can satisfy a certain connection probability is deduced. The connectivity probabilistic routing protocol(CPRP)is proposed to select the path with big connection probability as the data transmission path. The simulation results show that the proposed CPRP can improve the data packet delivery ratio, end⁃to⁃end transmission delay and throughput performance.%针对车载自组网VANETs的车间通信的连接问题进行分析。首先，假定车辆进入高速公路的时间间隔服从泊松分布，进而分析车辆间的通信连接性能。然后，推导了由n个车辆组成的通信连接概率的闭合表达式，同时，分析了在维持一定的连接概率时簇大小CLS和簇长度CLL的期望值，并讨论了车辆传输范围和密度对连接的影响，推导了满足一定连接概率时的车辆传输范围的临界值。最后，提出基于连接概率的路由协议CPRP，选择连接概率大的路径作为数据传输通道。仿真结果表明，提出的CPRP改善了数据包传递率、端到端传输时延以及吞吐量性能。