Abstract
Vehicular Ad Hoc Networks (VANETs) employ multichannel to provide a variety of safety and non-safety (transport efficiency and infotainment) applications, based on the IEEE 802.11p and IEEE 1609.4 protocols. Different types of applications require different levels Quality-of-Service (QoS) support. Recently, transport efficiency and infotainment applications (e.g., electronic map download and Internet access) have received more and more attention, and this kind of applications is expected to become a big market driver in a near future. In this paper, we propose an Efficient and QoS supported Multichannel Medium Access Control (EQM-MAC) protocol for VANETs in a highway environment. The EQM-MAC protocol utilizes the service channel resources for non-safety message transmissions during the whole synchronization interval, and it dynamically adjusts minimum contention window size for different non-safety services according to the traffic conditions. Theoretical model analysis and extensive simulation results show that the EQM-MAC protocol can support QoS services, while ensuring the high saturation throughput and low transmission delay for non-safety applications.
Highlights
Vehicular Ad Hoc Networks (VANETs) are part of the Intelligent Transportation System (ITS), which aim to provide safety-critical and commercial services on the road
This is because that, when the number of nodes is fixed, the larger Contention Window (CW) incurs smaller probabilities of successful reservations, and lower throughput can be achieved on the service channel (SCH), which can be seen from
We proposed an Efficient and QoS supported Multichannel Medium Access Control (MAC) (EQM-MAC)
Summary
Vehicular Ad Hoc Networks (VANETs) are part of the Intelligent Transportation System (ITS), which aim to provide safety-critical and commercial services on the road. Under a VANETs environment with light vehicle density but requiring heavy network service (e.g., near points of interests), CCHI may be idle for a long time, while the 50 ms SCHI is not enough to transmit bulk and near-real time flows, like QoS-sensitive video/audio traffic, typical of many infotainment applications [4], which could be strongly penalized their high channel access priority. The EQM-MAC protocol uses less time to deliver safety messages and allocates more time to make time slot reservations and channel coordination for SCHs. nodes have more opportunities to perform SCH reservation to deliver different service classes packets, and the number of successful reservations can be greatly increased. EQM-MAC protocol can offer sufficient QoS in terms of throughput and delay for non-safety messages through adjusting the minimum CW according to the vehicle density.
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