Orthogonal Frequency Division Multiple Access (OFDMA) is a proven multiple access technology and used in various wireless systems including 4 th generation wireless systems. In this paper, a novel and efficient packet delivery scheme using Orthogonal Frequency Division Multiple Access (OFDMA) for railroad communications in next generation Wireless Local Area Network (WLAN) is proposed. In next generation WLAN, it is crucial to provide enhanced throughput. The enhanced throughput can be achieved

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... with high transmission efficiency. In this paper, OFDMA is proposed to provide high transmission efficiency in next generation WLAN. In order for OFDMA to provide high transmission efficiency, highly dense traffic environment is favorable. Therefore, the proposed OFDMA based WLAN packet delivery scheme is anticipated to perform well in railroad communication environment. In this paper, a novel and efficient packet delivery scheme using OFDMA for railroad communications in next generation WLAN is proposed. The proposed WLAN OFDMA transmission scheme is able to provide high efficiency in railroad communication environment, since there are heavy traffic load in railroad communication of busy stations leading to large scheduling gain.