车联网中基于网络编码的优先级信息分发方案

A Network Coding Based Information Distribution Scheme with Priority in Internet of Vehicles

车联网中信息的共享尤其是紧急信息的分发至关重要。然而,传统的广播方式易引起网络风暴,导致信息传输时延高,预警效果差。为了实现海量信息的共享以及紧急信息的快速分发,提出了一种基于优先级的信息网络编码算法(Priority-based Information Network Coding Algorithm,PINCA),根据信息类别确定优先级别,优先对高优先级数据包进行线性网络编码与传输。仿真结果表明,相同仿真环境下,采用所提的PINCA时,紧急信息传输时延比现有传输方案下的时延减小了至少23.4944 ms,同时算法的时间复杂度也低于现有方案,可应用于路边设备稀疏的车联网系统中。

The sharing of information,especially the distribution of emergency information,in Internet of Vehicles(IoV)is crucial.However,the traditional broadcast method is prone to network storms,resulting in the high transmission delay of information and poor early warning effect.In order to realize the sharing of massive information and the rapid distribution of emergency information,a priority-based information network coding algorithm(PINCA)is proposed.The priority level is determined according to the information category,and the data packets with high priority are preferentially encoded with random linear network coding,and then transmitted.The simulation results show that in the same simulation environment,when the proposed PINCA is adopted,the transmission delay of emergency information is reduced by at least 23.4944 ms compared with that of the existing information transmission schemes,and the time complexity of the algorithm is also lower than that of the existing schemes.The scheme can be applied to the IoV system where roadside equipment is deployed sparsely.