klingler2012multi-channel
Abstract
Intelligent Transportation Systems (ITS) are the currently emerging technology to support handling the steadily increasing traffic volume on the roads. Typical applications which greatly benefit from Inter-Vehicular-Communication (IVC) are Traffic Information Systems (TIS), which provide traffic efficiency services like warnings about congestions and traffic jams. One way to exchange traffic information among vehicles is the usage of beacons which are small 1-hop broadcasts emitted in a periodic way. Accurate and timely information is necessary to help the driver to avoid traffic jams and prevent accidents. Periodic beaconing has the disadvantage that the trade off for both channel-utilization and speed of information-dissemination is not optimal for every combination of traffic density and network utilization. In other words, periodic beaconing suffers from massive packet-collisions in high traffic scenarios, whereas the speed of information-dissemination is not adjusted when the traffic density is low. To solve this problem, an adaptive beaconing protocol called ATB (Adaptive Traffic Beacon) was created recently which dynamically adapts the beacon interval in order not to overload the wireless channel. To further improve the scalability, it is necessary to take advantage of more than one wireless channel. For vehicular communication the IEEE 1609 (WAVE) Standard based on IEEE 802.11p has been developed, which provides one control and up to six data channels in the 5.85 GHz spectrum. The aim of this master thesis is, first, to study common multi-channel scheduling approaches and then to extend the currently available single-channel OMNeT++ simulation model of ATB with an multi-channel model using IEEE 1609.4 and IEEE 802.11p with packet prioritization mechanisms from IEEE 802.11e (EDCA). Measurements showed, that the developed multi-channel model of ATB with IEEE 802.11p and IEEE 1609.4 greatly reduce the observed packet collisions compared to the original single-channel version with IEEE 802.11b. Furthermore, algorithms help to evenly utilize the available service channels and EDCA additionally decreases collisions by distributing the beacons among several Access Categories with different priorities.
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BibTeX reference
@phdthesis{klingler2012multi-channel,
author = {Klingler, Florian},
title = {{A multi-channel beacon scheduling system for the exchange of traffic information in vehicular networks}},
advisor = {Dressler, Falko and Sommer, Christoph},
institution = {Institute of Computer Science},
location = {Innsbruck, Austria},
month = {August},
school = {University of Innsbruck},
type = {Master's Thesis},
year = {2012},
}
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