Method for discovering neighbor nodes in vehicle self-organizing network

Abstract

Disclosed is a method for discovering neighbor nodes in a vehicle self-organizing network. A vehicle in the network sends a beacon as follows: time is divided into time frames one by one, and each time frame is provided with a plurality of time slots; the number of the time slots in each time frame is set by the vehicle according to the traffic stream density in a road segment, and whenever a novel road segment is driven in, the vehicle resets the number of the time slots in each time frame according to the traffic stream density in the novel road segment; the beacon sending frequency is randomly set by the vehicle in a first time frame; when a novel time frame starts, and the vehicle selects another vehicle to be used as a reference vehicle according to received information in a previous time frame and calculates the sending frequency of the time frame according to the number of neighbors of the reference vehicle and the number of the time slots of the time frame; corresponding time slots are randomly selected according to the calculated sending frequency, the beacon is sent in a selected time slot, and the rest time slots are not used for sending the beacon. By means of the method for discovering the neighbor nodes in the vehicle self-organizing network, neighbor delay discovering can be reduced, fair neighbor node discovering can be guaranteed as well, and therefore the method is suitable for any vehicle self-organizing network.

Description

technical field [0001] The invention relates to a mechanism for discovering neighbor nodes in a network, in particular to a method for discovering neighbor nodes in a vehicle self-organizing network based on adaptive control beacon transmission, and belongs to the field of communication technology. Background technique [0002] In 1999, the Federal Communications Commission of the United States allocated the 75MHz frequency band as a dedicated short-range communication frequency band to support communication between vehicles and between vehicles and roadside infrastructure. When two vehicles are within the communication distance of each other, the two vehicles are neighbors, and the two vehicles that are neighbors can send and receive messages to each other. The so-called neighbor node discovery has two meanings: (1) When vehicle A enters the communication distance range of vehicle B, vehicle B discovers the arrival of vehicle A; (2) when vehicle A leaves the communication d...

AI Technical Summary

Problems solved by technology

[0005] In the vehicle ad hoc network, there are currently three methods for neighbor node discovery as follows, but each method has its own disadvantages: (1) Periodically and frequently broadcast beacon

Its disadvantage is that it cannot adapt to changes in the topology of the vehicle self-organizing network by using a fixed method of sending beacons.

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