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TCP is positioned in the transport layer of the OSI basic reference model, and is a protocol providing reliable data communications in end-nodes. DoCoMo uses TCP as a basic technology to provide primary services such as i-mode, I-motion, and full browser services. Since the R&D of TCP originally focused on wired net works, performance tends to be insufficient when applying conventional TCP to mobile communications networks, which have different communications characteristics than wired networks. As a case in point, a sudden increase in delay in mobile communications networks results in a TC retransmission timeout, thereby reducing throughput. DoCoMo has developed wireless TCP (W-TCP) technology optimized for mobile communications networks to provide high-quality services.
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