An adaptive control method for joint power and contention window for safety applications in Internet of Vehicles

Abstract

The invention relates to a joint power and contention window size adaptive control (joint Power and Contention window size Adaptive Control, PCAC) algorithm for security applications in the Internet of Vehicles. Dynamically adjust transmission power based on local vehicle density estimation to resolve the conflict between transmission range and interference; zero contention window, minislot method combined with receiver-based implicit acknowledgment mechanism is used to ensure preemptive priority and reliable transmission of emergency messages ; The node estimates the collision rate according to the data packets received from the neighbor nodes. Based on the estimated collision rate, the coarse-tuning and fine-tuning methods are used to adjust the contention window size of the basic security message to improve the throughput of the system. The PCAC algorithm adopts a distributed method without additional communication costs. Through a large number of simulation experiments, it is proved that PCAC can significantly 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). ...

AI Technical Summary

Problems solved by technology

[0003] However, broadcasting safety-related information to certain areas of interest or to specific regions in order to improve road safety faces many challenges:

[0004] ① It is well known that communication links between V2V and V2I are often short-lived due to the high-speed mobility of vehicles

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

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