An Energy Efficient Message Dissemination Scheme in Platoon-Based Driving Systems

Taeyoon Kim,Sangheon Pack,Taewon Song

doi:10.3390/en13153940

Abstract

With the development of the convergence of IT and automotive technology, platoon-based driving systems are getting more attention and how to disseminate messages in the platoon is an important issue. In this paper, to enhance the energy efficiency and traffic throughput (e.g., average velocity) while meeting transmission deadlines, we propose an energy efficient message dissemination scheme (EMDS) in platoon-based driving systems, which also provides proper power control and relay selection. To find out the optimal policy to balance the probability of successful message dissemination and transmission power cost in EMDS, we formulate a Markov decision process (MDP) problem that considers the velocity of the vehicles in the platoon. To evaluate the performance of EMDS, we analyze the outage probability, the average velocity, and the expected power consumption using the discrete-time Markov chain (DTMC) model. Evaluation results demonstrate EMDS with the optimal policy improves the average velocity and the energy efficiency of message dissemination compared with the conventional message dissemination schemes, while reducing the message dissemination failure rate.

Highlights

Platooning is a method for driving a group of autonomous/semi-autonomous vehicles together in which the vehicles move in a train-like manner [1]
To compare with efficient message dissemination scheme (EMDS), the fixed power of MP is set to the maximum transmit power of EMDS; (2) 2H where only vehicles located at a fixed distance of 2-hop from the current talker can be determined as the talker, while multiple transmit power can be selected; (3) 1H where only one-hop-based relay is allowed, while multiple transmit power can be selected; (4) DV where only a dedicated vehicle is allowed to relay messages during dissemination
5.9 GHz commonly used in IEEE 802.11p [27] and IEEE 802.11bd [28], the latest Wi-Fi V2X revisions currently in development for vehicle networks; log-distance path loss model of EMDS holds the bandwidth parameters of 5.9 GHz

Summary

Introduction

Platooning is a method for driving a group of autonomous/semi-autonomous vehicles together in which the vehicles move in a train-like manner [1]. A non-leader vehicle of the group maintains a small distance with the preceding vehicle to reduce fuel consumption by reducing the air drag and achieve efficient transport [2]. An important technology has been introduced in the past decade, autonomous cruise control (ACC). This ACC system with laser/radar sensors or camera can obtain the distance to the preceding vehicle, so it can adjust the movements of individual vehicles in the platoon [3]

Objectives

Results

Conclusion