Distributed distribution method and system of car networking emergent message transmission information

Abstract

The invention provides a distributed distribution method and system of car networking emergent message transmission information. Connection between a traffic flow and a car networking connectivity model is built by means of a poisson distribution model, and connectivity probability, connected set length, the number of connected sets and other important parameters are applied to the emergent message channel distribution method according to highway traffic scenes. Namely, vehicle nodes automatically adjust and control transmitting power to adjust the maximum communication distance according to vehicle node density, active channel time slot situations and the like of adjacent nodes obtained in a control channel, and accordingly the scale of the nodes scrambling for safe channel frequency band time slots on a certain road segment is effectively controlled, and the success rate and time delay of data sending of any node are guaranteed.

Description

technical field [0001] The present invention relates to a distributed distribution method and system for emergency message transmission information of the Internet of Vehicles, especially an emergency message transmission for the Internet of Vehicles that can improve the traffic flow of emergency messages and the competition of wireless channels for expressway traffic scenarios. Channel allocation method and system. Background technique [0002] People's attention to road traffic safety issues continues to rise, making the research on Vehicular Ad Hoc Network (VANET) a hot topic in the current academic and industrial circles. The essence of the Internet of Vehicles is to realize single-hop or multi-hop wireless communication between vehicles and between vehicles and roadside facilities, and to establish a temporary wireless network environment by self-organization. The communication content includes traffic accident location information , vehicle speed information, vehicle ...

AI Technical Summary

Problems solved by technology

The transmission of emergency messages between vehicles depends on the connectivity model of the network, and how the connectivity of vehicle nodes in the network is related to the traffic flow. Considering the distribution of traffic flow in the channel allocation method is one of the difficult problems that need to be solved urgently; On the other hand, if there are too many vehicle nodes in the connected network, the probability of successfully sending data through IEEE802.11p competing for the time slot of the wireless channel will decrease, which often leads to an increase in the transmission delay of urgent data. Controlling the size of vehicle nodes in competing wireless channel slots is another difficult problem

Images