A Congestion Control Method for Internet of Vehicles Based on Joint Adjustment of Power and Rate

Abstract

The invention relates to a vehicle ad hoc network congestion control method based on associated power-rate adjustment. Information is exchanged between a current vehicle node and a neighbor vehicle node in a vehicle ad hoc network, and comprises a beacon message and an emergency safety message. The method comprises the following steps that: 1) the current vehicle node maintains a neighbor node list; 2) the current vehicle node acquires a congestion degree of a current vehicle ad hoc network within an observation interval by taking a channel utilization ratio, a packet passing rate and average transmission delay as evaluation standards of vehicle ad hoc network states; and 3) the current vehicle node controls congestion in different vehicle ad hoc network states according to the congestion degree of the current vehicle ad hoc network. Compared with the prior art, the method has the advantages that the congestion degree in the vehicle ad hoc network is assessed comprehensively; associated power-rate adjustment of the beacon message is performed according to an assessment result at the same time; and transmission power of the emergency safety message is controlled, so that the congestion degree of the vehicle ad hoc network is lowered effectively.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a method for controlling congestion in the Internet of Vehicles based on joint adjustment of power and rate. Background technique [0002] With the development of economy and society, vehicles have become an indispensable tool in people's daily life. However, while vehicles bring convenience to people's travel, they also bring certain potential safety hazards. In order to ensure traffic safety, VANET (Vehicle Ad hoc Networks) came into being. VANET uses advanced sensing technology, network technology, computing technology, control technology, and intelligent technology to comprehensively perceive roads and traffic, so as to maintain high reliability and low delay data transmission between vehicles and between vehicles and roadside facilities. Dedicated control network. [0003] Driving safety in VANET is realized by interactively broadcasting information on the control ...

AI Technical Summary

Problems solved by technology

However, single control of these parameters often results in too slow adjustment rate, network congestion cannot be quickly and effectively relieved, and affects the timely transmission of emergency safety messages; and for the joint adjustment strategy using these parameters, the current research is mostly Unified adjustment, regardless of the degree of network congestion, which will lead to inflexible congestion control, resulting in low utilization of channel resources or too slow adjustment

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