Takashi Miyamura

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Traffic matrix is essential to traffic engineering (TE) methods. Because it is difficult to monitor traffic matrices directly, several methods for estimating them from link loads have been proposed. However, estimated traffic matrix includes estimation errors which degrade the performance of TE significantly. In this paper, we propose a method that reduces(More)
The growth of the Internet and emerging application layer technologies causes numerous changes in network environments. Therefore, it becomes important to achieve adaptive methods of controlling networks in addition to optimizing their performance. To achieve an adaptive network control method, we focus on attractor selection, which models behaviors where(More)
Network virtualization offers users flexibility and controllability in their network. Virtual network users directly customize their own network topologies for a specific purpose by leasing physical resources from physical network providers. However, the autonomic topology managed independently by each user can lead to the instability or performance(More)
A backup topology design algorithm for avoiding congestion in IP Fast Reroute is presented. In IP Fast Reroute techniques, detour routes are computed by using backup topologies. Reducing the number of backup topologies is the main problem, but some links will become overloaded if the number of backup topologies is reduced. The proposed backup topology(More)
Overlay networks achieve new functionality and enhance network performance by enabling control of routing at the application layer. However, this approach results in degradations of underlying networks due to the selfish behavior of overlay networks. In this paper, we discuss the stability of virtual network topology (VNT) control under overlay networks(More)
IP Fast Reroute techniques have been proposed for achieving fast failure recovery in just a few milliseconds. The basic idea of IP Fast Reroute is to reduce recovery time after failure by precomputing backup routes. A multiple routing configurations (MRC) algorithm has been proposed for obtaining IP Fast Reroute. MRC prepares backup configurations, which(More)
| We propose a bu®er management mechanism, called V-WFQ (Virtual Weighted Fair Queueing), for achieving approximately fair bandwidth allocation with a small hardware amount in high-speed networks. The basic process for allocating bandwidth fairly uses selective packet dropping to compare the measured input rate of the °ow with an estimated fair bandwidth(More)
IP Fast Reroute techniques have been proposed to achieve fast failure recovery in just a few milliseconds. The basic idea of IP Fast Reroute is to reduce recovery time after failure by precomputing backup routes. A multiple routing configurations (MRC) algorithm has been proposed for obtaining IP Fast Reroute. MRC prepares backup configurations, which are(More)
The growth of the Internet and emerging application layer technologies causes numerous changes in network environments. Therefore, it becomes important to achieve robust methods of controlling networks in addition to optimizing their performance. In this paper, we propose a robust virtual network topology (VNT) control method based on attractor selection,(More)