研究者詳細 - 山中　直明

論文 - 山中　直明

分割表示 279 件中 121 - 140 件目／全件表示 >>

Performance of dynamic multi-layer routing schemes in IP+optical networks

Oki E., Shiomoto K., Katayama M., Imajuku W., Yamanaka N.

Workshop on High performance Switching and Routing, 2003, HPSR 233 - 238 2003年

研究論文（国際会議プロシーディングス）, 共著

This paper presents two dynamic multi-layer routing policies for optical IP networks. Both policies first try to allocate a newly requested electrical path to an existing optical path that directly connects the source and destination nodes. If such a path is not available, the two policies employ different procedures. Policy 1, which has been published already, tries to find available existing optical paths with two or more hops that connect the source and destination nodes. Policy 2, which is proposed in this paper, tries to establish a new one-hop optical path between source and destination nodes. The performance of the two routing policies is evaluated. Simulation results suggest that policy 2 outperforms policy 1 if p is large, where p is the number of packet-switching-capable ports p; the reverse is true only if p is small. We observe that p is the key factor in choosing the most appropriate routing policy. © 2003 IEEE.

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Scalable shared-risk group management in shared mesh restorable wavelength routed networks

Shiomoto K., Imajuku W., Oki E., Okamoto S., Yamanaka N.

2003 Workshop on High-performance Switching and Routing, 2003 HPSR 189 - 194 2003年

研究論文（国際会議プロシーディングス）, 共著

The paper proposes a scaleable SRG-based restoration method in shared mesh wavelength-routed networks. We introduce a backup-SRG concept to identify which SRG is backed up by individual links. We have developed an admission control method for the backup path using the backup-SRG concept to achieve 100% recovery performance. The proposed method is extended to support networks with a large number of SRGs by introducing a hierarchical SRG assignment technique. Through computer simulation on the NSF network model, we confirmed that the proposed method achieves 100% recovery performance assuming a single link failure at the expense of 28.6% extra wavelength resource compared to the non-backup method. The proposed method requires less than 56.3% wavelength resource than that of the protection scheme while keeping 100% recovery performance. The hierarchical SRG assignment technique reduces the number of backup-SRGs to be used in admission control at each node at the expense of very little throughput degradation. © 2003 IEEE.

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Trends in high-performance switching and routing technologies

Yamanaka Naoaki, Chen Thomas M., Stuttgen Heinrich J.

IEEE Communications Magazine 40 （ 11 ） 36 - 37 2002年11月

ISSN 0163-6804

Demonstration of the Highly Reliable HIKARI Router Network Based on a Newly Developed Disjoint Path Selection Scheme

岡本聡，大木英司，島野勝弘，佐原明夫，山中直明

IEEE Communication Magazine (IEEE Workshop on High Performance Switching and Routing) Vol.40 （ No.11 ） 52-59 2002年11月

研究論文（国際会議プロシーディングス）, 共著, 査読有り

A Disjoint Path Selection Scheme With Shared Risk Link Groups in GMPLS Networks

大木英司,松浦伸昭,塩本公平, 山中直明

IEEE COMMUNICATIONS LETTER Vol.6 （ No.9 ） 406-408 2002年09月

研究論文（研究会，シンポジウム資料等）, 共著, 査読有り

A buffer management mechanism for achieving approximately fair bandwidth allocation in high-speed networks

Miyamura Takashi, Kurimoto Takashi, Nakagawa Kenji, Dhananjaya Prasad, Aoki Michihiro, Yamanaka Naoaki

IEICE Transactions on Communications E85-B （ 8 ） 1434 - 1441 2002年08月

研究論文（学術雑誌）, 共著, ISSN 0916-8516

We propose a buffer management mechanism, called V-WFQ (Virtual Weighted Fair Queueing), for achieving an approximately fair allocation of bandwidth with a small amount of hardware in a high-speed network. The basic process for the allocation of bandwidth uses selective packet dropping that compares the measured input rate of the flow with an estimated fair share of bandwidth. Although V-WFQ is a hardware-efficient FIFO-based algorithm, it achieves almost ideal fairness in bandwidth allocation. V-WFQ can be implemented in the high-speed core routers of today's IP backbone networks to provide various high-quality services. We have investigated V-WFQ's performance in terms of fairness and link utilization through extensive simulation. The results of simulation show that V-WFQ achieves a good balance between fairness and link utilization under various simulation conditions.

Experimental 5-Tb/s Packet-by-Packet Wavelength Switching System Using 2.5-Gb/s x 8-l WDM Links

山越公洋，松浦伸昭，中井康平，大木英司，大山貴晴，山中直明，，赤堀裕二

IEICE TRANSACTIONS on Communication Vol.E85-B （ No.7 ） 1293-1301 2002年07月

研究論文（研究会，シンポジウム資料等）, 共著, 査読有り

GMPLS-Based Photonic Multilayer Router (Hikari Router) Architecture: An Overview of Traffic Engineering and Signaling Technology

佐藤健一，山中直明，滝川好比郎，古賀正文，岡本聡，塩本公平，大木英司，今宿亙

IEEE Communication Magazine Vol.40 （ No.3 ） 96-101 2002年03月

研究論文（研究会，シンポジウム資料等）, 共著, 査読有り

Dynamic deficit roung-robin scheduling scheme for variable-length packets

山越公洋, 中井康平，大木英司，山中直明

ELECTRONIC LETTERS Vol.38 （ No.3 ） 2002年01月

研究論文（研究会，シンポジウム資料等）, 共著, 査読有り

Packet-by-packet wavelength-routing interconnect technique for 5 Tbit/s switching system

杉浦伸明，山越公洋，大木英司，山中直明，大山貴晴，赤堀裕二

ELECTRONIC LETTERS Vol.38 （ No.2 ） 82-83 2002年01月

研究論文（研究会，シンポジウム資料等）, 共著, 査読有り

Next generation carriers internet backbone node architecture (MSN type-X)

Aoki M., Yamanaka N., Kurimoto T., Miyamura T., Nishikido J.

2002 Workshop on High-performance Switching and Routing, 2002 HPSR 156 - 160 2002年

研究論文（国際会議プロシーディングス）, 共著

Next generation carriers Internet backbone node architecture are proposed that offer sophisticated QoS support including real time voice, video streaming, and VPN. The backbone core node, MSN (multi-service network) Type-X, has 320 Gb/s throughput and IP V4/V6 dual stack forwarding capability and OC-192C full wire-rate forwarding performance. In addition, sophisticated DiffServ having 4096 virtual queue realizing full hardware is also proposed. In addition, Type-X has ATM emulation technique. Finally, the paper describes a high-reliability technique such as a newly structured non-stop software and firmware upgrade technique. This newly proposed technique and system offers the next generation, real time, high-QoS capability. © 2002 IEICE.

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An 80 Gb/s Optical I/O Interface ATM Switch MCM

川野龍介，山中直明，大木英司，岡崎勝彦，大木明

Electronics and Communications in Japan, Part 1 Vol.85 （ No.2 ） 61-68 2002年

研究論文（研究会，シンポジウム資料等）, 共著

A heuristic multi-layer optimum topology design scheme based on traffic measurement for IP + photonic networks

Oki Eiji, Shiomoto Kohei, Okamoto Satoru, Imajuku Wataru, Yamanaka Naoaki

Optical Fiber Communication Conference 2022 104 - 105 2002年

研究論文（国際会議プロシーディングス）, 共著

On performance prediction of address lookup algorithms of IP routers through simulation and analysis techniques

Kawabe Ryo, Ata Shingo, Murata Masayuki, Uga Masanori, Shiomoto Kohei, Yamanaka Naoaki

2146 - 2151 2002年

Many address lookup methods on the IP routers have been recently proposed to improve the packet forwarding capability; nevertheless, their performance prediction is very limited because of lack of considering actual traffic characteristics in their evaluations. It is necessary to consider actual traffic to predict more realistic performances on routers, specially in case of layers 3 and 4 switches whose performances are more influenced by flow characteristic. In this paper, we propose new methods for predicting the router's performance based on the statistical analysis of the Internet traffic. We also present an example of its application to the existing table lookup algorithm, and show that simulation results based on our method can provide accurate performance prediction.

Traffic engineering and signaling technologies in photonic-GMPLS-router networks

Yamanaka N., Okamoto S., Shiomoto K., Oki E., Imajuku W.

142 - 146 2002年

This paper describes multilayer traffic engineering and signaling technologies in a photonic-GMPLS-router network. Multilayer traffic engineering, which yields the dynamic cooperation of IP and photonic layers, is described to provide IP services cost-effectively. To realize multilayer traffic engineering, we propose the OSPF extension, which advertises both the number of total wavelengths and the number of unreserved wavelengths, and the RSVP-TE extension, which realizes the least number of wavelength conversions. In addition, this paper presents a heuristic-based multilayer topology design scheme that uses IP traffic measurements in a generalized multiprotocol label switch (GMPLS). Our design scheme yields the optical label switch path (OLSP) network topology, i.e. OLSP placement, that minimizes network cost, in response to fluctuations in IP traffic demand. In other words, the OLSP network topology is dynamically reconfigured to match IP traffic demand. Networks are reconfigured by the proposed scheme so as to utilize the network resources cost-effectively. © 2002 IEICE.

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Active queue control scheme for achieving approximately fair bandwidth allocation

Miyamura Takashi, Kurimoto Takashi, Nakagawa Kenji, Dhananjaya Prasad, Aoki Michihiro, Yamanaka Naoaki

1269 - 1273 2002年

We propose a buffer 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 flow with an estimated fair bandwidth share. Though V-WFQ is a hardware-efficient FIFO-based algorithm, it can achieve almost ideal fairness in bandwidth allocation. Simulation results show that V-WFQ achieves a good balance between fairness and link utilization under various simulation conditions.

MSN Type-X

Yamanaka Naoaki, Kurimoto Takashi, Miyamura Takashi, Aoki Michihiko

2095 - 2099 2002年

Next generation Internet backbone node architectures are proposed that offer sophisticated QoS support including real time voice, videostreaming, and VPN. The backbone core node, named MSN (Multi-service network) Type-X, has 320 Gb/s throughput and IP V.4/V.6 dual stack forwarding capability. Note that, through the employment of state-of-the art VLSI technology, both V.4 and V.6, OC-192C full wire-rate forwarding performance is achieved for the first time. In addition, sophisticated DiffServ with programmable thousands of virtual queues is also proposed to realize a complete set of hardware. In addition, Type-X uses an ATM emulation technique that can into allow the new packet centric backbone to support conventional services. Finally, the paper describes high-reliability techniques such as newly structured service non-stop software and a firmware upgrade technique. These newly proposed techniques and systems will realize the next generation, real time, high-QoS capability, and VPN IP backbone network to be realized.

5-Tb/S electro-optical ATM switching system hardware components using small optical WDM packet-switched interconnection modules

Matsuura Nobuaki, Yamakoshi Kimihiro, Oki Eiji, Yamanaka Naoaki, Ohyama Takaharu, Akahori Yuji

300 - 304 2002年

A 5-Tb/s asynchronous transfer mode (ATM) switching system called OPTIMA-2 (optically interconnected multi-stage ATM switch architecture ) that uses optical packet-by-packet switched wavelength division multiplexing (WDM) links for the intraswitch interconnections was experimentally described. The design, fabrication, and evaluation of the optical WDM interconnection modules for OPTIMA-2 were discussed. The feasibility of a multi Tb/s switching system was successfully demonstrated.

Multi-layer traffic engineering in photonic-GMPLS-router networks

Yamanaka Naoaki, Katayama Masaru, Shiomoto Kohei, Oki Eiji, Matsuura Nobuaki

2731 - 2735 2002年

This paper describes multi-layer traffic engineering and signaling technologies in photonic-GMPLS-router networks. Multi-layer traffic engineering, which yields the dynamic cooperation of IP and photonic layers for providing IP services cost-effectively, is described. To realize multi-layer traffic engineering, we propose an OSPF extension that advertises both the number of total wavelengths and the number of unused wavelengths, and an RSVP-TE extension that minimizes the number of wavelength conversions needed. In addition, this paper presents a heuristic-based multi-layer topology design scheme that uses IP traffic measurements in a generalized multi-protocol label switch (GMPLS). Our design scheme yields the optical label switch path (OLSP) network topology, i.e. OLSP placement, that minimizes network cost, in response to fluctuations in IP traffic demand. In other words, the OLSP network topology is dynamically reconfigured to match IP traffic demand. Networks are reconfigured by the proposed scheme so as to utilize the network resources in the most cost-effective manner.

Performance prediction method for IP lookup algorithms

Kawabe R., Ata S., Murata M., Uga M., Shiomoto K., Yamanaka N.

111 - 115 2002年

Many address lookup methods for use on IP routers to improve their packet-forwarding capability have been proposed. However, their performance prediction ability is poor because actual traffic characteristics are not considered in their evaluation processes. The actual traffic must be considered in order to predict router performance more accurately, especially for layer 3 and 4 address lookups, whose performances are more affected by the flow characteristics. We describe a method for predicting IP lookup algorithm performance that is based on statistical analysis of the Internet traffic. We present an example of its application to an existing IP lookup algorithm and show, based on simulation results, that our method can provide accurate performance prediction for IP lookup algorithms. © 2002 IEICE.

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