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TCP is a popular internet protocol for reliable end-to-end data delivery, but it cannot be applied to wireless networks in which packet loss may be induced by higher BER or handover than congestion. It assumes that such packet loss is caused by network congestion and initiates congestion control procedures. In this paper, we present a novel protocol using Explicit Handover Notification to improve TCP performance over wireless links. Additionally, we execute simulations using network simulator and compare the simulated protocols.

Recent proliferation of Wireless LAN devices has created a high demand for roaming systems that enable network connections at visited institntions using users' home accounts. We have been operating eduroam, the roaming system for international research and edncational institutions. However, if the roaming system is to be introduced into more than a thousand of research and educational institutions in Japan, some operational and management difficulties arise at each institution as well as at the eduroam national operational body. Tn this paper, we propose a centralized delegate authentication system using pseudonymous ID for reducing operational cost and for protecting user's location privacy. A prototype system using Shibboleth is also presented.

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