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C. Cocho:
"Analysis and Development of TDMA Based Communication Scheme for Car-to-Car and Car-to-Infrastructure Communication Based on IEEE802.11p and IEEE1609 WAVE Standards";
Supervisor: A. Paier, C. Mecklenbräuker; Institut für Nachrichtentechnik und Hochfrequenztechnik (E389), 2009; final examination: 05-29-2009.

Safety critical Intelligent Transportation Systems (ITS) applications provide information to vehicles to avoid potentially dangerous traffic situations or to reduce the seriousness of an accident. This information, when received well in advance, provides an early warning to the driver and becomes increasingly time-critical as the vehicle approaches the site of an incident or potential accident. It can be seen, therefore, that these communications must be reliable, have a high success rate and not suffer from excessive latency.
In Europe it was concluded, after a study of the spectrum requirements in the 5.9 GHz band, carried out by the Commission of European Post and Telecommunications (CEPT) that at least 30 MHz were necessary for "safety related applications" in the frequency range 5875-5905 MHz. Within this spectrum a dedicated allocation of bandwidth usage has been proposed by the European Telecommunications Standards Institute, ETSI. For high usage of bandwidth the preliminary standards IEEE 802.11p and IEEE 1609.4 have proposed adjacent 10 MHz channels which may cause interference using low cost WLAN Chipsets.
The goal of this diploma thesis is to analyse and develop an alternative scheme based on Time Division Multiplex Access (TDMA) technology to avoid these channel interferences. The Network Simulator (version 2.33) and the IEEE family standards 802.11 and 1609 will be the main tools used to carry out the diploma.
Firstly the TDMA based protocol will be defined theoretically and later introduced in the source code of the Network Simulator. Once the protocol is debugged, some test environments (written in Tool Command Language code) will be set up to obtain different trace files that lately will be used to obtain graphical results by using Perl scripts. Finally those results will be used to compare the actual Frequency Division Multiplex Access (FDMA) based protocol with our TDMA based protocol developed.

vehicular communications, WAVE, IEEE 802.11p, MAC, TDMA

http://publik.tuwien.ac.at/files/PubDat_175609.pdf