Channel-Aware Congestion Control in Vehicular Cyber-Physical Systems

Byeong-Moon Cho,Min-Seong Jang,Kyung-Joon Park

doi:10.1109/access.2020.2987416

Byeong-Moon Cho, Min-Seong Jang + Show 1 more

Open Access

https://doi.org/10.1109/access.2020.2987416

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Abstract

In vehicular cyber-physical systems, cars are connected to create a mobile network called a vehicular ad hoc network (VANET) to perform various functions, including improved awareness of the surrounding environment. Moving vehicles continually broadcast beacon signals containing information such as position, heading, acceleration, steering angle, vehicle size, and accident notification. However, channel congestion in dense traffic conditions adversely affects network performance. To resolve congestion in VANETs, several works in the literature have studied congestion control. However, they have considered packet loss only as an indication of channel congestion regardless of channel condition. In this paper, we present a channel-aware congestion control algorithm (CACC) that controls the transmission power and data rate. We take into account the received signal strength (RSS) when diagnosing packet loss to determine channel conditions, such as severe fading or channel congestion. In the case of severe fading, we decrease the data rate for a more robust modulation and coding scheme. Additionally, we adjust the transmission power to maintain a desirable packet error rate. Our simulation results show that CACC significantly outperforms other distributed congestion control algorithms by reducing the packet loss rate and increasing the packet delivery ratio.

Highlights

A vehicular ad hoc network (VANET) in a vehicular cyber-physical system (CPS) is a technology that uses cars as nodes to build a mobile network
Since vehicle-to-vehicle safety applications heavily rely on timely delivery of status information, resolving packet loss is a critical issue
We have proposed the channel-aware congestion control (CACC) algorithm, which can effectively resolve packet loss in vehicular CPS, unlike the conventional distributed congestion control algorithm, which always considers packet loss as an indication of congestion

Summary

INTRODUCTION

A vehicular ad hoc network (VANET) in a vehicular cyber-physical system (CPS) is a technology that uses cars as nodes to build a mobile network. To alleviate channel congestion in V2V, a number of standards and algorithms have been proposed to reduce packet collision, where each vehicle dynamically adjusts its transmission parameters, such as message rate and transmit power, according to the channel condition. We need an effective congestion control algorithm that can distinguish the cause of packet loss and react to each situation in a different manner to provide the required communication performance in VANETs. In this paper, we propose a channel-aware congestion control (CACC) algorithm that can consider the received signal strength (RSS) when diagnosing packet loss. The proposed CACC algorithm determines whether packet loss is due to congestion or bad channel and tunes network parameters . The facilities layer in ETSI ITS provides support for different applications

AND RELATED WORK

SYSTEM MODEL AND EFFECT OF FADING

CHANNEL-AWARE CONGESTION CONTROL

5: READ RSS of packet-error signal

Findings

CONCLUSION