Research On Distributed Resource Allocation Strategy Of Vehicular Networks

With the rapid development of wireless communication technology,the 5th generation mobile networks(5G)is entering a commercial phase.As one of the important applications of 5G ultra-high reliability and ultra-low latency scenarios,vehicular networks use V2X(Vehicle to Everything)communication technology to ensure traffic safety,improve traffic efficiency,and provide on-board entertainment.However,due to the complexity and high mobility of vehicular networks,the communication performance of the existing network cannot meet the actual needs.Using V2V(Vehicle to Vehicle)communication based on PC5 interface can reduce the time delay of vehicle communication and improve radio resource utilization.Therefore,this thesis studies the distributed resource allocation strategy based on V2V,and studies the collaborative information transmission with low power consumption based on this.The specific contents are as follows:Considering the A2A(All to All)broadcast scenario of V2V communication in vehicular networks,a two-stage resource allocation scheme is proposed.In the first stage,the communication area of vehicles is divided into grids to reuse spectrum resources.At the same time,considering the interference caused by vehicles among different grids and the reliability of V2V communication,the optimal grid division side-length is determined.In the second stage,based on full-duplex and the self-interference cancellation technology,an improved coded slotted ALOHA algorithm is proposed,which improves the retransmission mechanism of packets and realizes the time-slot allocation for vehicles in the same grid.In addition,transmission priorities of different information services packets are set to ensure the transmission reliability of security-related service information.Simulation results have shown that the scheme can effectively reduce the number of retransmissions and decrease the packet loss rate of high-priority packets in the A2A broadcast system.Due to the limitation of communication range,the distributed communication based on V2V cannot meet the transmission requirements for the high data rate and low delay communication scenarios in vehicular networks.Therefore,a low-power V2X cooperative transmission resource allocation scheme is proposed in the thesis to achieve efficient transmission of vehicles at different speeds.It is assumed that both the vehicle and roadside infrastructure are communication nodes in vehicular networks.Under the requirements of high data transmission rates and with the goal of minimizing the total power consumption of information transmission,the scheme can cooperatively select communication nodes to transmit information and determine their power allocation according to the topology of roadside infrastructure and vehicles.Simulation results have shown that the scheme can effectively improve the communication energy efficiency in vehicular networks,and support high-speed driving scenarios.