Design And Implementation Of Network Resource Scheduling Optimization For Vehicle Collaboration

Vehicular Ad Hoc Networks(VANET),provides intelligent traffic management andinformation services by integrating heterogeneous networks into communications between vehicle-to-vehicle,vehicle-to-road,and vehicle-to-pedestrian/thing.With the development of the VANET,the single wireless communication can no longer meet the user’s demand for Qo E of network services,and multi-network integration has become the development trend.The WAVE(Wireless Access in Vehicular Environment)protocol architecture proposed by the United States is the most widely used of the existing VANET protocol standards.Based on the WAVE protocol framework,the researchers used the technology of heterogeneous network fusion to integrate multiple wireless networks to improve the Qo S of the VANET.In this paper,the driving risk assessment method is used to model and describe the vehicles synergetic pattern,and a link resource scheduling optimization algorithm in VANET is designed based on this model.The effectiveness is analyzed from the aspects of link transmission delay and link utilization.The specific research contents are as follows:(1)In terms of the transmission frequency of security information in VANET,this paper establishes the risk field model of multiple vehicles by combining the driving risk assessment method,which reflects the influence of vehicles interaction on driving safety under the synergy of vehicles.Based on the risk field model,the risk force of the vehicle is calculated,and the real-time transmission frequency of the security information is obtained through the comparison of the risk force which is verified by SUMO simulation platform.And it is proved that the model can reduce the data traffic of security information by ensuring the transmission requirements of security information.(2)In terms of the characteristics of heterogeneous network and the demands of multi-network fusion,this paper designs a new network resource scheduling algorithm,LLCA(link scheduling algorithm in LLC),at the data link layer according to the existing protocol standard of VANET.The algorithm classifies data packets by calculating the priority of data,defines the real-time delay rate,real-time load rate and other parameters of link-state evaluation,and proposes the security information estimator and data priority matching degree of links as the standard of transmission frequency of non-security information.(3)In terms of the transmission frequency optimization security information and non-security information,this paper uses pareto optimal theory to verify that LLCA algorithmcan improve the maximum transmission frequency of non-security information as much as possible by ensuring the transmission frequency of security information.Simulation results show that LLCA algorithm can ensure the transmission of security information and reduce the transmission delay of non-security information in non-extreme traffic environment.