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Joint power and contention window size adaptive control algorithm for security application in Internet of Vehicles

A technology of adaptive control and contention window, which is applied in the field of adaptive control algorithm of combined power and contention window, can solve the problems that the contention window of transmission power cannot meet the safety requirements, cannot guarantee the transmission delay of emergency messages, etc., and can improve the throughput of the system , increase the duration, the effect of reliable transmission

Active Publication Date: 2020-01-14
QINGDAO AGRI UNIV
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AI Technical Summary

Problems solved by technology

However, the adjustment of transmission power and contention window are difficult to meet the security requirements
This is because this literature assigns a non-zero contention window to urgent messages, and urgent messages still require backoff, so the algorithm cannot guarantee the transmission delay of urgent messages for a definite duration

Method used

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  • Joint power and contention window size adaptive control algorithm for security application in Internet of Vehicles
  • Joint power and contention window size adaptive control algorithm for security application in Internet of Vehicles
  • Joint power and contention window size adaptive control algorithm for security application in Internet of Vehicles

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Embodiment Construction

[0043] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. Adaptive control algorithms for joint power and contention windows for safety applications in Internet of Vehicles, such as figure 1 As shown, the algorithm includes the following steps:

[0044] 1) Once the vehicle enters the road, the system parameters are initialized, the transmission power takes the maximum value, and the competition window takes the minimum value, =0.25, where, is a constant that depends on traffic flow theory. The maximum transmission power is 32, and the minimum contention window is 15. From the document "Local density estimation and dynamic transmission-range assignment in vehicular ad hoc networks".

[0045] 2) Each vehicle periodically broadcasts data packets containing the vehicle ID, 12-digit serial number, and basic safety message BSMs of the motion state. The basic safety information of the vehicle's motion...

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Abstract

The invention relates to a joint power and contention window size adaptive control (PCAC) algorithm for security application in the Internet of Vehicles. The transmission power is dynamically adjustedaccording to the estimation of the local vehicle density so as to solve the conflict between the transmission range and the interference; a zero-competition window and a minislot method are combinedwith an implicit confirmation mechanism based on a receiving end to ensure the preemptive priority and reliable transmission of the emergency message; a node estimates a conflict rate according to a data packet received from a neighbor node, and based on the estimated conflict rate, the size of a contention window of a basic security message is adjusted by adopting a coarse adjustment and fine adjustment combined method to improve the throughput of a system. A PCAC algorithm adopts a distributed mode, extra communication cost is avoided, and a large number of simulation experiments prove thatthe PCAC can obviously improve the data packet delivery rate and throughput of security services and reduce transmission delay.

Description

technical field [0001] The invention relates to the technical field of Internet of Vehicles communication, in particular to an adaptive control algorithm for joint power and contention window oriented to safety applications in the Internet of Vehicles. Background technique [0002] Vehicular Ad Hoc Networks (VANETs), also known as the Internet of Vehicles, is dedicated to vehicle-to-infrastructure (V2I) and vehicle-to-vehicle (V2V) communication , with the aim of improving road safety. VANETs are an important part of intelligent transportation systems, which enable vehicles to quickly and accurately collect real-time road traffic information and timely notify neighboring vehicles of potential hazards on the road. It's worth noting that most security applications work on a broadcast basis, since security information needs to be sent to all surrounding vehicles. To improve traffic safety, VANETs use event-driven emergency messages and periodic Basic Safety Messages (BSMs). ...

Claims

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Application Information

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IPC IPC(8): H04W4/90H04W4/06H04W4/44H04W4/46
CPCH04W4/06H04W4/44H04W4/46H04W4/90
Inventor 宋彩霞张发宋笑笑王承明
Owner QINGDAO AGRI UNIV
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