Data packet competition forwarding method used in vehicle-mounted Ad hoc network
A data packet and network technology, applied in the field of data transmission, can solve problems such as increased network load, seriousness, and complex routing problems, and achieve the effect of satisfying real-time transmission, simple operation steps, and low computational complexity.
Inactive Publication Date: 2011-11-02
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology
Due to various reasons such as high-speed movement of vehicles and street obstacles, the vehicle-mounted Ad hoc network has significant characteristics different from ordinary Ad hoc networks. One of them is that the phenomenon of network segmentation is particularly serious. In an uncertain environment, if you want to maintain the topology information of the network structure anytime and anywhere, it will inevitably lead to a significant increase in network load, making the routing problem more complicated.
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[0035] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0036] The present invention is a kind of vehicle-mounted Ad hoc network that is suitable for urban environment adopts the route realization method that contention is forwarded to data packet, and this method comprises following operation steps:
[0037] Step 1. Model the road environment of the city as an undirected graph with weight values: in this undirected graph, the endpoint set is the set of road forks, and the edge set is the set of streets between two forks. The movement of vehicles in this undirected graph is to move along the edge from one end point to another end point, and the weight value of the street depends on the street traffic flow information and the physical length of the street.
[0038] In this undirected graph, length(m, n) and traffic(m, n...
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A method for competitively forwarding a data packet in a vehicle Ad hoc network, which is suitable for an urban environment, comprises the following steps: (1) modeling an urban road environment to obtain a weighted undirected graph; (2) performing dynamic selection and update of road forks in a data packet forwarding path; (3) updating the location information of a destination node; (4) forwarding the data packet based on a competitive forwarding strategy; and (5) conforming reception in the last hop in the data packet forwarding process. The method takes full use of the features of the vehicle Ad hoc network nodes, and has indices such as data packet delivery rate, time delay, average hop number and total data quantity sent by a physical layer superior to other algorithms which are usedcurrently. The method also has the advantages of simple operation and low computation complexity, and can satisfy the requirements for real-time transmission.
Description
technical field [0001] The present invention relates to a data transmission method in a new network architecture, to be precise, relates to a method for competitively forwarding data packets in a vehicle-mounted Ad hoc network used in an urban road environment, and belongs to the technical field of mobile ad-hoc network applications in mobile communications . Background technique [0002] Vehicle Ad Hoc Networks (VANET, vehicle ad hoc networks) is a special ad hoc mobile Ad Hoc network, the nodes of which are composed of motor vehicles equipped with wireless transceivers. In recent years, due to the rapid increase of urban vehicles, traffic jams have become increasingly serious, and even traffic accidents have occurred frequently. Therefore, it has gradually become a research hotspot to use the vehicle-mounted network to communicate between vehicles or between the console and each vehicle to dredge traffic flow or improve the efficiency of logistics enterprises. Due to var...
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IPC IPC(8): H04L12/56H04L12/28H04L47/20
Inventor 廖建新王晶王纯李炜李元振李彤红朱晓民张磊徐童张乐剑沈奇威樊利民程莉
Owner BEIJING UNIV OF POSTS & TELECOMM