Koichi Asatani

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Call admission control (CAC) is essential for the QoS guarantee communications. VoIP services require QoS guarantee as the existing telephony services. This paper proposes a new CAC scheme for VoIP to achieve efficient use of network resources by adopting a dynamic routing and a routing history table. This scheme chooses the better route out of two(More)
(Asia Pacific Board), and TMF (TeleManagement Forum), continued to play an important role for exchanging and discussing all aspects of telecommunications management among academic and telecommunication industry at large in the Asia-The theme of this symposium was " Integrated Management for Telecom-munication Solutions—Process, OSS and Technology. " With(More)
— One of the main issues of Mobile IPv6 is handover latency that causes service disruption time. Although plenty of proposals significantly reduce the service disruption time, they suffer from redundant routing that causes packet misordering and bandwidth consumption during the process of inter-domain handover. In this paper, we propose R-MIP, a(More)
The Internet real-time applications are growing rapidly, and available bandwidth estimation is required. Available bandwidth estimation methods by end host have been studied e.g. Pathload and pathChirp. These methods parameterize probe packets volume and observe the delay variation to estimate available bandwidth. In these methods, probe packets give heavy(More)
One of the main issues of mobile IPv6 is handover latency that causes service disruption time. Although plenty of proposals significantly reduce the service disruption time, they suffer from redundant routing that causes packet misordering and excess bandwidth consumption. In this paper, we propose a new scheme that minimizes the redundant routing during(More)