Efficient Groupcast Schemes for Vehicle Platooning in V2V Network

Junhyeong Kim,Youngnam Han,Ilgyu Kim

doi:10.1109/access.2019.2955791

Abstract

Recently, groupcast has taken a lot of attention for vehicle platooning in vehicle-to-vehicle (V2V) network. In general, a traditional groupcast scheme by retransmission where source vehicle user equipment (S-VE) repeatedly transmits the same packet to destination VEs (D-VEs) is implemented in two ways; repetitive transmission for a predetermined number of times without receiving hybrid automatic repeat request (HARQ)-ACK/NACK from the D-VEs, and retransmission based on the HARQ-ACK/NACK. Although the former scheme is very easy to implement, it may lead to inefficient resource utilization due to excessive retransmissions. For the latter, the same problem arises when link quality between S-VE and D-VE is constantly poor. Hence, in this paper, we first investigate a heuristic scheme that can yield the superior performance of groupcast success rate with low computational complexity. Then, a groupcast scheme with the joint control of retransmission VE (R-VE) selection and time domain resource allocation is investigated by formulating a Markov decision process (MDP). The goal of the second proposed scheme is to find an optimal joint strategy for R-VE selection and time domain resource allocation that can minimize total time consumption while satisfying desired performance in terms of groupcast success rate. Simulation results validate that the proposed schemes significantly improve the groupcast success rate and the efficiency of time domain resource utilization, and greatly reduce the completion time of groupcast as compared with the two traditional groupcast schemes.

Highlights

Vehicle-to-everything (V2X) communications has recently attracted considerable attention as a facilitator of intelligent transportation system (ITS)
Since the channel measurement results presented in [28] showed that a Nakagami distribution well describes the statistics of the small-scale fading in V2V communications and it was used for the channel model in the work [29], we model the V2V groupcast channel for vehicle platooning as independent Nakagami-m fading channel with parameter m to characterize a wide range of fading environments for V2V links
In this paper, we studied the problem of groupcast for vehicle platooning, where vehicles of a platoon moving in the single lane communicate with each other through V2V groupcast without network assistance

Summary

Introduction

Vehicle-to-everything (V2X) communications has recently attracted considerable attention as a facilitator of intelligent transportation system (ITS). Vehicles dynamically formed into a platoon are able to accelerate or brake simultaneously, which can eliminate the distance needed for human reaction and allow a closer headway between vehicles [7], [8]. It has recently emerged as a promising strategy that can enable the road capacity enhancement preventing traffic jams [9] and raise the fuel efficiency of vehicles in the platoon [10]

Objectives

Results

Conclusion