Optimal CSMA/CA protocol for safety messages in vehicular Ad-Hoc networks
File(s)
Published version
Author(s)
Rossi, G
Leung, KK
Type
Conference Paper
Abstract
Vehicular ad-hoc networks (VANETs) that enable
communication among vehicles have recently attracted signif-
icant interest from researchers, due to the range of practical
applications they can facilitate, particularly related to road
safety. Despite the stringent performance requirements for such
applications, the IEEE 802.11p standard still uses the carrier
sensing medium access/collision avoidance (CSMA/CA) protocol.
The latter when used in broadcast fashion employs a randomly
selected backoff period from a fixed contention window (CW)
range, which can cause performance degradation as a result of
vehicular density changes. Concerns regarding the robustness
and adaptiveness of protocols to support time-critical applica-
tions have been raised, which motivate this work. This paper
investigates how the maximum CW size can be optimised to
enhance performance based on vehicular density. A stochastic
model is developed to obtain the optimal maximum CW that can
be integrated in an amended CSMA/CA protocol to maximise
the single-hop throughput among adjacent vehicles. Simulations
confirm our optimised protocol can greatly improve the channel
throughput and transmission delay performance, when compared
to the standardised CSMA/CA, to support safety application in
VANETs.
communication among vehicles have recently attracted signif-
icant interest from researchers, due to the range of practical
applications they can facilitate, particularly related to road
safety. Despite the stringent performance requirements for such
applications, the IEEE 802.11p standard still uses the carrier
sensing medium access/collision avoidance (CSMA/CA) protocol.
The latter when used in broadcast fashion employs a randomly
selected backoff period from a fixed contention window (CW)
range, which can cause performance degradation as a result of
vehicular density changes. Concerns regarding the robustness
and adaptiveness of protocols to support time-critical applica-
tions have been raised, which motivate this work. This paper
investigates how the maximum CW size can be optimised to
enhance performance based on vehicular density. A stochastic
model is developed to obtain the optimal maximum CW that can
be integrated in an amended CSMA/CA protocol to maximise
the single-hop throughput among adjacent vehicles. Simulations
confirm our optimised protocol can greatly improve the channel
throughput and transmission delay performance, when compared
to the standardised CSMA/CA, to support safety application in
VANETs.
Date Issued
2017-09-08
Date Acceptance
2017-03-31
Citation
2017
Publisher
IEEE
Copyright Statement
© 2017 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Sponsor
Defence Science and Technology Laboratory (DSTL)
Defence Science and Technology Laboratory (DSTL)
Grant Number
DSTLX1000064099
DSTLX1000064099
Source
IEEE Symposium on Computers and Communications (ISCC) 2017
Subjects
Science & Technology
Technology
Computer Science, Information Systems
Engineering, Electrical & Electronic
Telecommunications
Computer Science
Engineering
Vehicular Ad-Hoc Networks
Throughput
transmission probability
MAC layer
802.11p
CSMA/CA
Contention Window
Publication Status
Accepted
Start Date
2017-07-03
Finish Date
2017-07-06
Coverage Spatial
Heraklion, Crete