Research On Geocasting Alorihhm Based On Bus Trajectory And Location Information

The Internet of Vehicles is a typical application of the Internet of Things technology in the field of transportation systems,and can support the delivery of three types of information such as safety information,entertainment information,and functional service information.In the application of Internet of Vehicles,geocasting can form regional broadcasts to forward business information and advertisements related to geographic location,or send emergency messages to designated areas.Most of the traditional regional groupcasting algorithms are used in WSN,which does not take into account the road network topology and vehicle trajectory information,and is not suitable for the groupcasting requirements in the Internet of Vehicles.In the urban environment,the number of ordinary vehicles is large,the operation is irregular,and the topology is complex,which may cause link instability.For the delivery of entertainment information in urban environments,this article selects bus nodes with fixed operating lines and available trajectories,which are more stable than ordinary vehicles,and the communication link is not easy to disconnect.In the routing stage of geocasting,a bus encounter model is established,a geographic encounter map of the bus is constructed,and the message forwarding capability Cp of the bus node to the regional multicast destination area is calculated.The node with the strongest message forwarding capability is selected to forward messages to the destination area.In the continuous broadcast stage of geocasting,on each trunk road in the destination area,by defining vehicle stability indicators,a vehicle set is established and maintained.With the vehicle set,vehicles passing through the destination area need only one hop to deliver information.Finally,this paper uses SUMO+OMNET++and Veins simulation platform to verify the proposed BTGR algorithm,and compares it with Epidemic,NTR,and IPBB algorithms in packet delivery rate and average end-to-end delay.With the number of vehicles and the message With the increase of the generation rate,the algorithm can reduce the average end-to-end delay by 20s while increasing the packet delivery rate by 11%.As the vehicle speed increases,the BTGR algorithm proposed in this paper performs stably.