Research On V2X Key Technologies For Dynamic High-precision Map Transmission

As one of the most important technologies in automatic driving system,the dynamic high-precision map provides a safe driving space for the automatic driving vehicle by providing all scene and all-weather precise space-time positioning.V2X communication technology is the key guarantee to realize ubiquitous interconnection of people,vehicles and roads.The high realiability and real-time transmission of the dynamic high-precision map is the key factor to ensure the safety of automatic driving.V2X-assisted information transmission of dynamic high-precision map can meet the strict requirements of high speed,low latency and high reliability data transmission.However,the huge amount of data and its time-varying characteristics bring great challenges to the transmission of dynamic high-precision map in the real internet of vehicles scenario,with the rapid changing of network topology and wireless channel interference.Therefore,aiming at solving the problems in the process of dynamic high-precision map collection and distribution,this paper focuses on the cooperative transmission technology based on V2X,and propose an efficient solution for map data collection and distribution.Firstly,considering the latency and reliability requirements of dynamic map information collection in highly dynamic vehicle network environment,this paper studies how to collect information efficiently based on cooperative V2X.And proposes a dynamic high-precision map information collection strategy based on clustering algorithm.In this strategy,CFAC dynamic clustering algorithm based on competition factor and cluster maintenance mechanism are proposed.Based on the stable vehicle cluster structure,this paper makes further efforts on a distributed map information collection strategy which is derived from Dynamic Programming algorithm.By reducing the redundant transmission of similar information,the channel congestion problem in high-density internet of vehicles scenario is effectively alleviated.Secondly,from the perspective of efficient utilization of spectrum resources,this paper proposes a cooperative V2X dynamic high-precision map information distribution strategy based on spectrum sharing,aiming at the bandwidth bottleneck in the process of high-precision map distribution.Furthermore,in order to cope with the complex and changeable wireless network interference,the interference management scheme of joint mode selection,power control and resource allocation is proposed,which meets the delay and reliability requirements of high-precision map data distribution,and effectively ensures the overall network performance.In view of the highly dynamic vehicle network structure,the complex wireless network interference,the latency and reliability requirements of massive map data transmission,this paper proposes the dynamic high-precision map information collection strategy based on clustering algorithm and the cooperative V2X dynamic high-precision map information distribution strategy based on spectrum sharing.It can effectively alleviate the problems such as the lack of spectrum resources in the high-density Internet of vehicles environment,and realize the efficient and reliable information transmission of dynamic high-precision map.