| Summary: | 碩士 === 國立成功大學 === 資訊工程學系碩博士班 === 101 === This thesis designs a communication protocol for streaming video data that are captured from a grade crossing. The corresponding communication protocol can be used in the Grade Crossing Alarm System (GCAS) to deliver the monitored video of a grade crossing as an aid for train drivers to make more precise decision for driving through grade crossings. This safety video data have requirements of a higher packet delivery ratio, higher throughput and lower delay and need to have the higher priority than other non-safety video data. Road Side Units (RSUs) and On Board Units (OBUs) used in GCAS adopt dual-interface WAVE devices. Road Side Units (RSUs) and OBUs, which are allocated in trains, used in the proposed GCAS communicate with each other using the wireless Vehicular Ad Hoc Networks (VANET) scenario. According to the dual-interface characteristics, this thesis also proposes a three channel per cycle (TCPC) channel allocation algorithm for RSUs in GACS and an Inter-QoS scheme for other vehicles out of GCAS. Finally, the NS-2 simulation results show that the immediate access performances is better than that of the alternating access in this grade crossing scenario: lower delay, higher packet delivery ratio and higher throughput. Using immediate channel access, train driver can successfully receive the high quality streaming video data from a grade crossing.
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