Publications in Scientific Journals:
A. Alonso, C. Mecklenbräuker:
"Dependability of Decentralized Congestion Control for varying VANET density";
IEEE Transactions on Vehicular Technology,
IEEE 802.11p is an amendment to the IEEE 802.11 standard for Wireless Access in Vehicular Environments (WAVE). Lower layer wireless transmission formats and protocols are defined for both vehicle- to-infrastructure and vehicle-to-vehicle communication links to support cooperative Intelligent Transport Systems (ITS). The Medium Access Control (MAC) layer uses carrier sensing as a means for detecting the busy state of the radio channel before transmitting. In heavily loaded Vehicular Ad-hoc NETworks (VANETs) the channel access delay when attempting to access the channel increases unpredictably when it is sensed as busy. The European Telecommunications Standards Institute (ETSI) defines safety-related messages. These messages require a dependable behaviour of the communication link. In this context, dependable behaviour translates to the reliable delivery of data packets within a specified deadline regardless of changes in the traffic density. Unfortunately, the WAVE amendment does not fulfil the requirements for such dependable behaviour. This contribution reports on performance evaluations by simulation studies of the IEEE 802.11p MAC and the Decentralized Congestion Control (DCC) mechanism specified by ETSI in addition to the existing Enhanced Distributed Channel Access (EDCA). The simulation scenario under study is a two VANET merging highway situation. The MAC protocol has to adapt to variable traffic densities in this scenario. The performance is evaluated in terms of coverage range and MAC-to-MAC delay reliability, and DCC state stability. Furthermore, a novel performance indicator a defined, evaluated, and discussed which the authors have named data novelty. Finally, a multistate-active DCC mechanism is proposed, which achieves a dependable behaviour.
Delays, Media Access Protocol, Reliability, Vehicles, Vehicular ad hoc networks
"Official" electronic version of the publication (accessed through its Digital Object Identifier - DOI)
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Created from the Publication Database of the Vienna University of Technology.