摘要: Cooperative intelligent transport systems (C-ITS), where vehicles cooperate by exchanging messages wirelessly to avoid, for example, hazardous road traffic situations, receive a great deal of attention throughout the world currently. Many C-ITS applications will utilize wireless communication technology IEEE 802.11p, which offers ability direct between vehicles, i.e., ad hoc communication, up 1000 meters. In this thesis, medium access control (MAC) protocols vehicular networks (VANET) are scrutinized and evaluated. The MAC protocol decides when station has right shared channel schedules transmissions minimize interference at receiving stations. A VANET is challenging network because number stations in unknown priori cannot be bounded. Therefore, scalability method major influence on performance applications. Two different studied: carrier sense multiple (CSMA) 802.11p self-organizing time division (STDMA). These two methods examined with re-spect requirements settings arising from standardization. Based these constraints, suitable measures derived such as MAC-to-MAC delay detection distance, former catches both reliability. In STDMA, upper-bounded therefore known before transmission, since regardless within radio range, all always guaranteed timely access. CSMA, not it until transmission commences, based instantaneous load can experience random backoff. The evaluation CSMA STDMA performed through extensive computer simulations, model-ling 10 km highway six lanes each direction. Vehicles travel along broad-cast position periodically update rates. Two models have been used during evaluations, one distinguishing receiver being line-of-sight (LOS) or obstructed LOS (OLOS) transceiver, while other does consider this. simulation results, models, show that average smaller than STDMA. However, results also reveal achieves better reliability especially distances 100-500 meters transmitter receiver. approaching first other, 100 longer CSMA. This thesis concludes very VANET-based
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