A content forwarding node selection method in a vehicle-mounted ad hoc network based on a service type

Abstract

The invention discloses a content forwarding node selection method in a vehicle-mounted ad hoc network based on a service type, which comprises the following steps of: calculating a bandwidth occupation scale factor according to a content information type of a request and a bandwidth occupation condition of a neighbor vehicle which can be forwarded in a one-hop transmission range; defining virtualarrival time from the candidate forwarding vehicle to the initial request vehicle according to the distance between the neighbor vehicle and the initial request vehicle and the driving speed of the neighbor vehicle; calculating a forwarding node influence factor according to the bandwidth occupation scale factor and the virtual arrival time; and selecting the forwarding node according to the forwarding node influence factor. The forwarding node is selected according to the bandwidth occupation condition and the node position moving speed, the network delay caused by the network topology change can be effectively avoided, the content information forwarding success rate is improved, and therefore the success arrival rate of the content data packet is effectively increased, the transmissiondelay is reduced, and the network performance is improved.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a method for selecting a content forwarding node in a vehicle-mounted ad hoc network based on a service type. Background technique [0002] As a research direction of mobile ad hoc network (MANET), vehicular ad hoc network (VANET) has important applications in intelligent transportation system (ITS). VANET regards vehicle nodes and road infrastructure as network nodes, and mainly realizes communication between vehicles (V2V, Vehicle-to-Vehicle Communication) and communication between vehicles and roadside facilities (V2I, Vehicle-to-Infrastructure Communication). The real-time communication mobile network improves traffic safety and management efficiency, and also provides more services for vehicle driving. Due to the high mobility of vehicles, VANET has the characteristics of frequent network topology changes. In VANET scenarios, general MANET protocols are pr...

AI Technical Summary

Problems solved by technology

However, due to the high-speed mobility of the vehicles, the vehicles participating in the cooperation in the request information arrival path may have left the communication range of each other during the process of returning the content, and the communication link cannot be established, and the content may not be able to arrive smoothly by returning the original route. The initial content request vehicle; there may also be a better forwarding path than returning to the original requesting vehicle according to the original path of the request information

Images