Data distribution method for vehicle ad hoc network based on topology discovery
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A technology of self-organizing network and topology discovery, which is applied in the direction of data exchange details, devices providing special services in branch offices, electrical components, etc., can solve problems such as insufficient timeliness, improve reliability, increase success rate, and reduce load Effect
Inactive Publication Date: 2015-12-09
BEIJING UNIV OF POSTS & TELECOMM
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[0012] In this scheme, after the vehicle receives the forwarding message, it obtains the information of the neighbor nodes through continuous active inquiry, and then determines the forwarding vehicle according to the mutual comparison of the neighbor nodes, which causes a certain degree of communication delay. Somewhat imperfect for higher vehicular ad hoc networks
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Embodiment 1
[0047] In the vehicle self-organizing network, the ETSITCITS organization divides its existing information into two categories: CAM and DENM. Among them, the CAM information mainly involves the basic information of the vehicle, such as the current position, speed, acceleration, and direction of motion. Vehicle transmission, so it is generally transmitted through a single hop; DENM information is triggered when an event occurs, such as accident alarms, safety alarms, vacant parking space messages, etc., and they need to be transmitted to the possible impact area of the event in a timely and effective manner Therefore, it is generally transmitted through multiple hops.
[0048] According to the above two message types, the present invention defines two types of data message formats: safety message and event message, and the two messages are the concrete representations of CAM and DENM respectively. Considering that CAM is generally sent to surrounding vehicles periodically, t...
Embodiment 2
[0088] The present embodiment sets forth the technical solution of the present invention through specific simulations, specifically as follows:
[0089] This instance model is tested with network simulation software NS2. The size of the simulation scene is an area of 2250*2250 square meters, the number of intersections is 9 (3*3), the width of each lane is 5 meters, and the distance between intersections is 750 meters. The event message generation source is set in the central area of the scene.
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Abstract
The invention provides a topology-discovery-based data distribution method of a vehicle self-organizing network. The method comprises the steps as follows: a broadcast cycle of a source vehicle is calculated, and an event message monitored by the source vehicle is broadcasted according to the broadcast cycle; the event message serves as a probe of topology discovery, and the source vehicle is colored according to a coloring principle; and waiting time for a receiving vehicle is calculated, after the receiving vehicle receives the event message, whether the event message is forwarded at the waiting time is determined, if yes, the receiving vehicle is colored dark grey, and the event message is broadcasted, otherwise, the receiving vehicle is colored grey, and the process is finished. The topology-discovery-based data distribution method of the vehicle self-organizing network defines the broadcast cycle of the source vehicle and the waiting time of the receiving vehicle, so that the time delay of message transmission is reduced effectively, the reliability of event message transmission is improved, the number of transcripts of event message in the network is controlled, and the network communication load is reduced.
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