Inter-Vehicle Communications by Marc Torrent Moreno

By Marc Torrent Moreno

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The contributions of this thesis have been previously published in [TMJH04], [STMHE04], [FTMT+ 05], [TMSH05], [TMKH05], [SELMTMH06], [TMFH06], [TMSEFH06], [TMSH06], [TMM06], [FTMK+ 06], [SETMT+ 06], [TMCSEH06], [SETMMH07] and [TM07]. 6 2 Enabling Vehicular Active Safety with IVC-Based Systems Several projects, technologies and applications involving inter-vehicle communications (IVC) have been proposed in the last couple of decades. Moreover, commercial services enabled by wireless communication between vehicles and road side equipment (or road side units) have become quite popular in the late 90s.

Up to 200m. This behavior results in the known ‘near-far effect’ that refers to the situation where a node R is close to one specific transmitter T1 and further away from another one T2 when both are simultaneously sending a message to the wireless 29 3 Simulation Analysis of IVC: Periodic One-Hop Broadcast channel. In the case that both messages are transmitted with the same power, T1 ’s message can be successfully received (captured) by R since its signal received power is much higher than the one from T2 .

At this instant the station can transmit. If, on the other hand, the medium becomes busy before the backoff timer reaches 0, the process is suspended until the medium becomes idle again. However, before the backoff mechanism is allowed to start or resume decrementing the backoff timer, the medium has to stay idle for the duration of a DIFS. 1 Underlying wireless communications technology After a transmitted frame a new backoff is performed even if there is no other frame waiting to be sent. This ‘post’ backoff ensures that the transmitting station will not have priority over any other waiting station, if any.

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