Method for expanding coverage of vehicle networking security information broadcast

Abstract

The invention discloses a method for expanding coverage of vehicle networking security information broadcast and includes the steps of designing a non-uniform backoff window initial value selective probability according to dynamitic regulation of a backoff window constraint sequence Xr and forwarding nodes spaced source nodes by different distances, and conditions to be met for the constraint sequence Xr in a scenario of actual security information forwarding application; calculating a Gamma r distance constraint factor through a relative distance dr and structuring the constraint sequence Xr through the Gamma r factor; and initializing the initial value of a backoff window counter and accessing to a backoff process to realize access control of shared media after the initial value of the backoff window is generated in each forwarding node under the constraint of the constraint sequence Xr. The method for improving the vehicle networking security information broadcast coverage has the advantages that the purpose of improving effective coverage of multi-hop broadcasting of security information within time slot in a CCH (channel check handler) channel is achieved by improving the probabilities of forwarding data packages in the time slot of the nodes relatively distant from the source nodes at one jump reach and the like.

Description

Technical field [0001] The present invention relates to the technical field of vehicle networking communication, and in particular to a method for improving the coverage of vehicle networking safety information broadcasting. Background technique [0002] The Internet of Vehicles is the core part of the future intelligent transportation system (Intelligent Transportation System, referred to as ITS). It provides drivers with self-organized wireless multi-hop communication between vehicle nodes (V2V) or between vehicle nodes and roadside nodes (V2R). , Passengers, etc. provide assisted driving, safety warnings, multimedia application services, etc., in order to reduce the rate of traffic accidents, implement emergency rescue, reduce traffic congestion, and improve traffic efficiency. According to the different information carried by the Internet of Vehicles, its applications can be divided into two categories, namely: safety-related information and non-safety-related information. A...

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Problems solved by technology

[0004] For security information, in order to enable more nodes to receive security information in a short period of time, the broadcast process often uses multi-hop broadcasting, but the existing protocols have the following disadvantages: (1) The Internet of Vehicles communication protocol IEEE802 .11p The MAC layer uses the EDCA (Enhanced Distributed Channel Access) mechanism. Although this mechanism sets different priorities for different types of information by distinguishing queues, the forwarding of information with the same priority In the process (such as security information) channel competition is fair and disorderly. On the one hand, this disorder will inevitably lead to frequent collisions of information forwarded by adjacent nodes, so that security information cannot be effectively forwarded; on the other hand, On the one hand, from the perspective of improving the forwarding coverage of security information, forwarding nodes at the edge of one-hop coverage of information source nodes have better forwarding coverage than neighboring forwarding nodes, but in this disorderly competition mode, the two The probability of information forwarding is the same for those who obtain the right to use the channel, so it is not conducive to improving the effective coverage of security information

(2) In the application scenario of intelligent transportation, safety-related information has an effective time tolerance, and the maximum effective time tolerance of most safety-related information is 100ms, that is to say, the time and source of the safety information received by the receiving vehicle node The time interval for the node to send the information should be less than or equal to 100ms. If this time limit is exceeded, the data will be of no value to the vehicle node receiving the information. The control channel (CCH) time slot for safety information transmission has a duration of 50ms in each cycle, so the time available for safety information forwarding is very limited

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