Method for controlling vehicle self-organizing network congestion based on joint power and speed regulation

Abstract

The invention discloses a method for controlling vehicle self-organizing network congestion based on joint power and speed regulation, and mainly solves the problems that in the prior art, congestion cannot be controlled through speed control under a condition that vehicles are dense in a crossroad, and channel utilization rate is low. The method comprises the following steps that each vehicle detects a local channel load L uninterruptedly at a detection interval T; each vehicle estimates a total target channel load LO of the next detection interval when the detection interval is finished according to the detected local channel load L; the vehicles in the crossroad are divided into a first group A and a second group B, each group selects a representative vehicle to participate in a non-cooperative two-stage bargaining game, so that the channel load of the next detection interval is not more than the total target channel load LO; transmission power p and speed r of periodic secure information are adjusted in a distributed manner by each vehicle according to the result of the non-cooperative bargaining game. The method can be used for effectively controlling the channel congestion, and improving the utilization of channel bandwidth.

Description

technical field [0001] The invention belongs to the field of communication technology, and mainly relates to a congestion control method of safety information in a vehicle ad hoc network, which can be used for congestion control of safety information at intersections. Background technique [0002] In today's society, road traffic problems are attracting more and more attention. Applying vehicular ad hoc network to intelligent transportation system can better help drivers improve driving safety. In the vehicular ad hoc network, by exchanging safety messages between vehicles, vehicles can be familiar with the driving status of surrounding vehicles and sudden emergencies, so as to ensure reliable and efficient transmission of safety information. The security information is divided into two types of periodic security information and event-driven security information. However, due to the limitation of wireless channel capacity, in the case of high vehicle density, only periodic...

AI Technical Summary

Problems solved by technology

However, due to the limitation of wireless channel capacity, in the case of high vehicle density, only periodic safety information can easily cause channel congestion. Once this happens, it will inevitably affect the effective reception of safety information, thus It may cause the driving safety of the vehicle to be threatened, so the congestion control problem of safety information is particularly critical

The current IEEE802.11p working group is working on the standardization work applicable to vehicular communication, in which the only method of congestion control is once the channel occupancy rate is detected to be higher than 50%, except for the information with the highest priority, other Information is forbidden to access the channel, but this mechanism has the following limitations: First, it cannot solve the channel congestion caused by periodic security informat

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