Details of a Researcher - Yamanaka, Naoaki

Presentations -

Division display 181 - 200 of about 446 ／ All the affair displays >>

Energy Saving Optical Access Network based on Hybrid Passive/Active Architecture

Kazumasa Tokuhashi, Daisuke Ishii, Satoru Okamato, YAMANAKA NAOAKI

[Domestic presentation] IEICE Technical Report on Photonic Network (東京都　目黒区　東京工業大学手島精一記念会議室) ,

2011.11

Oral presentation (general)

This paper proposes an energy saving optical access network based on hybrid passive/active architecture. Thanks to using waveguide optical switch with nanosec order switching speed, several of PON trees are aggregarted to a few OLTs when the network supports a low number of registered Optical Network Units (ONUs) or low loaded. The proposed system reduces energy consumption of OLT while improving fairness of transmission rate between subscribers. Moreover, the merit of using optical switches is to realize fast fiber and OLT protection/restoration. We aim for a flexible network by the combine the merit of passive and active system.

Future Service Adaptive Access/Aggregation Network Architecture

Hiroki Ikeda, Hidetoshi Takeshita, Satoru Okamoto, YAMANAKA NAOAKI

[International presentation] 14th Annual International Conference on Next Generation Internet and Related Technologies(MPLS2011) (Washington, DC) ,

2011.10

Oral presentation (general)

We propose service adaptive access/aggregation network architecture which unifies various kinds of service networks into single access/aggregation network. Proposed access/aggregation network unifies leased line networks, micro data center networks, Internet networks, and mobile backhaul networks, etc. To simplify the network structure, proposed network unifies various kinds of service networks, realizes long reach transmission and accommodation of large number of users. Some of the services, for example a leased line service, require high reliable transmission and various kinds of QoS. To realize these requirements, we propose programmable OLT/ONU technology and utilization of MPLS-TP. MPLS-TP has already emerged in core network. So MPLS-TP can control through access network to core network by proposed network. Therefore, end to end high reliability and multi QoS transmission is realized.

Development of the MiDORi Ethernet Switch Prototype Systems

Satoru Okamoto, Hidetoshi Takeshita, Yuji Oikawa, Daisuke Ishii, YAMANAKA NAOAKI

[Domestic presentation] IEICE Society Conference (北海道札幌市北海道大学) ,

2011.09

Oral presentation (general)

我々は, トラヒックエンジニアリング(TE)によりネットワークのトラヒックを片寄し, 未利用リンクを積極的に削減していくネットワーク的な省電力化のアプローチ MiDORi (Multi-(layer, path, and resources) Dynamically Optimized Routing) を提案し, 最小消費電力トポロジーの導出手法, MiDORi Path Computation Engine (PCE)としての実装, GMPLS (Generalized Multi-Protocol Label Switching)制御プロトコルへのMiDORi拡張提案等を進めている. 今回, MiDORi PCEと連携して, TEによる省電力効果を確認するために, 省電力機能を有するMiDORiイーサネットスイッチプロトタイプを開発した結果を報告する.

Smart Grid Network Architecture with New Fair Demand Reservation Algorithm

Soushi Yamamoto, Daisuke Ishii, Satoru Okamoto, YAMANAKA NAOAKI

[Domestic presentation] IEICE Technical Report on Photonic Network (北海道函館市　勤労者総合福祉センター) ,

2011.08

Oral presentation (general)

A Study on Power Source Selection Scheme for Minimization of Transmission Loss on Smart Grid Network

Soushi Yamamoto, Daisuke Ishii, Satoru Okamoto, YAMANAKA NAOAKI

[Domestic presentation] The 6th IEICE Student Workshop on Photonic Network (Hokkaido, Japan) ,

2011.08

Oral presentation (general)

In this manuscript, the discussion about a power source selection scheme is described to minimize transmission loss in the future smart grid network where energy is traded directly between suppliers and consumers.As the future smart grid platform, we have proposed Energy Virtual Network Operator (EVNO) which controls the matching of suppliers and consumers virtually.EVNO provides low-cost power transmission by selecting an optimal power supplier for each consumer in consideration of time domain and space domain. Challenges of the power source selection scheme in EVNO are clari ed.

A Study of Scalable Dynamic Bandwidth Allocation in Optical Aggregation Network

Yuji Shimada, Takehiro Sato, Kunitaka Ashizawa, Kazumasa Tokuhashi, Daisuke Ishii, Satoru Okamoto, Eiji Oki, YAMANAKA NAOAKI

[Domestic presentation] IEICE Technical Report on Photonic Network (Wakayama, Japan) ,

2011.06

Oral presentation (general)

Recently,the power consumption of Internet is increasing rapidly. Thus,we have been proposing an optical aggregation network,which reduces the power consumption of today's Internet greatly. The optical aggregation network connects solitary giant router and thousands of users in transparent 1-hop network. This research proposes new dynamic bandwidth allocation. The propose scheme groups ONUs by considering their distances from OLT (Optical Line Terminal), and calculates their bandwidth allocated to one group while other groups are sending data to OLT. Evaluation shows the proposed scheme achives high bandwidth utilization.

Highly-accurate Short-term Forecasting Photovoltaic Output Power Architecture without Meteorological Observations in Smart Grid

Jun Matsumoto, Daisuke Ishii, Satoru Okamoto, Eiji Oki, YAMANAKA NAOAKI

[International presentation] 1st International Symposium on Access Spaces (IEEE-ISAS 2011) (Yokohama, Japan) ,

2011.06

Oral presentation (general)

We propose a forecasting architecture of near future photovoltaic output power based on the multipoint output power data via smart meter. The conventional forecasting methods are based on the analysis of meteorological observation data, and need the implementation of dedicated meters and the connection to them. Moreover, highly-accurate forecasting(in second-scale, or meter-scale) is difficult in the conventional methods. Our proposed method is based on not meteorological observation data but the actual measured output power data by using the solar panels connected with a smart meter as sensing units. A forecasting calculation server interpolate spatially the actual measured data collected from multipoint, and forecasts near future output power in each point using optical flow estimation. Virtual sampling technique involves the forecast performance when the sampling point is sparse. We show the forecasting method achieves high accuracy of less than 5% error rate by the computer simulation.

IP based Service Mash-up Provision by uGrid

Kenta Nakahara, Kou Kikuta, Daisuke Ishii, Satoru Okamoto, YAMANAKA NAOAKI

[International presentation] 7th International Conference on IP+Optical Network (iPOP2011) (NEC Tamagawa Plant, Kawasaki, Kanagawa, Japan) ,

2011.06

Poster presentation

With the advance of the ubiquitous society by shift to IPv6, it is expected that various devices such as cars, home electronics, sensors, tags, and so on will be allocated IP address and connected to the network environment. On the other hand, Cloud computing is attracting the world. Cloud computing, via Internet, provides computation, software, data access, and storage services that do not require end-user knowledge. Then, we have been proposing IP based uGrid (ubiquitous Grid Networking Environment). In uGrid, everything connected to the network is defined as “Service-Part” and assigned IP address. Service-Parts mean not only devices but also software programs and data functions which are virtually “things”. Users can use Service-Parts all over the world. Moreover, by combining various Service-Parts via network, uGrid can provide new mash-up services. Figure 1 shows a concept of IP based uGrid. By connecting several IP addresses, the mash-up service of Service-Parts is realized. Because uGrid manages Service-Parts and executes uGrid service provisioning based on IP address, we utilize the IP mechanism such as routing, signaling, and DNS. The merit of utilizing IP mechanism is that, IP is an originally scalable mechanism, and many sophisticated technologies accumulated for years are available. As a technology to manage Service-Parts with IP addresses, GMPLS is applicable. GMPLS is a suite of protocols which allows automate the provisioning and management of the network. Originally, GMPLS was proposed to generalize MPLS for packet switched network to other networks with different switching capabilities like TDM, lambda, fiber, and so on. Our motivation is to extend this “generalized” from switching capability (network, data link, and physical layer) to Service-Parts (application layer). In this research, extended routing protocol (Service-Routing) and extended signaling protocol (Service-Signaling) are proposed. Service-Routing searches Service-Parts and calculates the route for service mash-up. Service-Signaling executes reservation of Service-Parts resources and the establishment of the connection among Service-Parts. By experiment, it is shown that the combination of Service-Routing and Service-Signaling was succeeded. This technology can realize next generation inter-Cloud which integrates the various Cloud such as SaaS, PaaS and HaaS/IaaS. By interconnecting various IP addresses of services via high-speed and high-capacity optical path, mash-up of service, as if executed in one server without considering the network distance, in cloud network can be realized.

A Study of Slot Switching-based All-optical Service Aggregation Network

Takehiro Sato, Kunitaka Ashizawa, Kazumasa Tokuhashi, Daisuke Ishii, Satoru Okamoto, Eiji Oki, YAMANAKA NAOAKI

[International presentation] 7th International Conference on IP+Optical Network (iPOP2011) (NEC Tamagawa Plant, Kawasaki, Kanagawa, Japan) ,

2011.06

Poster presentation

We propose a slot-switching based all-optical network to support various network services. Aggregating various types of networks (e.g., access networks for residential users, leased lines for business users, mobile backhauls, and fibre channels for data centers) in a single network is discussed as a candidate of next generation access network. Figure 1 shows the concept of this network. There are virtual OLTs (Optical Line Terminals) in a solitary programmable OLT and each of them provides different services at respective protocols. By integrating network equipments, this network reduces energy consumption drastically. It also facilitates the introduction of new network services which use their own protocols. The simplest way to realize this network is using WDM (Wavelength Division Multiplexing) and allocating each wavelength to each network service. However, this method has low scalability because the number of wavelengths that are able to multiplex in a single fiber is limited. In addition, CAPEX (CAPital EXpenditure) becomes high because it is necessary to develop various types of transceivers that adapt different wavelengths respectively. Our proposed network is an expansion of Active Optical access Network (ActiON) that we have proposed earlier, and uses high-speed optical switches. As shown in Figure 2, this network has capability to transfer any data signal formats transparently in a single wavelength. The bandwidth is shared by all users and dynamically allocated by fixed-length time slots. In this presentation, we mainly discuss the network architecture.

Live Data Center Migration over Next Generation Layer2 Network

Haruki Takahashi, Daisuke Ishii, Satoru Okamoto, YAMANAKA NAOAKI

[International presentation] 7th International Conference on IP+Optical Network (iPOP2011) (NEC Tamagawa Plant, Kawasaki, Kanagawa, Japan) ,

2011.06

Poster presentation

Recent years, cloud computing which provides computational resources via Internet is attracting the world. Electricity consumption of data centers increases rapidly because the number of users of data centers increases with the growth of cloud computing. According to the world wide trend which urges growing out of dependence on fossil fuel and nuclear energy, it is hoped to consume electricity effectively and wisely. Then, we propose Live Data Center Migration, which can use electricity wisely because functions of data centers are transferred to other data centers geographically apart. For this proposal, we expand the live migration technology into wide area. This technology is originally used inside a data center, and able to transfer virtual machines from the server to another without stopping processes of the virtual machines. Fig. 1 shows the basic concept of our proposal network. The networks among the data centers are set up over the NGL2 (New Generation Layer 2) network with GMPLS (Generalized Multi-Protocol Label Switching) before the virtual machines migration. During the live migration, the memory images of the virtual machines are transferred via this network. The routes between users and data centers have to be switched smoothly after the virtual machine migration. There are two methods to solve this problem. The first is that, packets arrived at DAT (Dynamic Address Translation) are encapsulated with the header addressed to the data center, and transferred via Internet. The route can be switched due to changing the destination address of capsulation header. The other is that, packets arrived at NGL2 switch are added VLAN (Virtual LAN) tags, and transferred via the NGL2 network. It is necessary to set up VLAN path between users and data centers in advance and the route can be switched due to changing VLAN tag. The proposed system is implemented as shown in Fig.2. In this presentation, we mainly discuss the protocol of how to set up the networks among data centers and how to switch the routes between users and data centers.

A Study of Next Generation Metro-Access Hybrid Scalable Network by Using PLZT Ultra High Speed Optical Wavelength Selective Switch

Yutaro Hara, Takehiro Sato, Yuji Shimada, Kunitaka Ashizawa, Kazumasa Tokuhashi, Daisuke Ishii, Satoru Okamoto, YAMANAKA NAOAKI

[International presentation] 1st International Symposium on Access Spaces (IEEE-ISAS 2011) (Yokohama, Japan) ,

2011.06

Oral presentation (general)

We have studied a novel optical access network with PLZT (Plomb Lanthanum Zirconate Titanate) optical switches,called ActiON (Active Optical Network), as a next generation access network to replace PON (Passive Optical Network). On the other hand, energy consumption of the present network becomes an important problem today. To resolve this problem, we study an energy efﬁcient metro-access hybrid network by using ActiON. Also, it is necessary to extend a bandwidth capacity of ActiON to realize a scalable network. In this paper, we mainly focus on an energy consumption and a scalability. As a result, the proposed next generation metro-access hybrid scalable network accommodates 600000 users. In the evaluation, we show that proposed network reduces 65 % of energy consumption compare to the present network. Furthermore, blocking ratio of proposed network is lower than a quality assurance of the Internet service in any cases.

High energy-efficient IP network architecture with Giant Center Router and Optical Aggregation Network

Hidetoshi Takeshita, Daisuke Ishii, Satoru Okamoto, Eiji Oki, YAMANAKA NAOAKI

[International presentation] 1st International Symposium on Access Spaces (IEEE-ISAS 2011) (Yokohama, Japan) ,

2011.06

Oral presentation (general)

This paper proposes high energy-efficient IP network architecture with Giant Center Router and Optical Aggregation Network. User IP packets are aggregated and transferred to Giant Center Router through Optical Aggregation Network transparently by dynamic optical resource allocation. Giant Center Router is power scalable with an amount of traffic proportionally. Optical Aggregation network is realized by circuit switches, wavelength converters, and wavelength multiplexers/ demultiplexers. The proposed network scheme reduces the power consumption to 1/20-1/30 compared to the conventional Internet, realizes a network structure well suited to traffic centralization, and offers smooth migration from the conventional Internet.

Scalable Multi-Path Discovery Technique for Parallel Data Transmission in Next Generation Wide Area Layer-2 Network

Jumpei Marukawa, Yuki Nomura, Shota Yamada, Midori Terasawa, Satoru Okamoto, YAMANAKA NAOAKI

[International presentation] 1st International Symposium on Access Spaces (IEEE-ISAS 2011) (Yokohama, Japan) ,

2011.06

Oral presentation (general)

This paper focuses on parallel data transmission, which is one of the solutions in considering high-speed transmission in next generation wide area layer-2 network. To realize parallel data transmission, reliable delay and route measuring for every possible path between two nodes and choosing multiple paths with small delay difference is necessary. This paper proposes a new multipath discovery and delay measurement method using bi-directional flooding technique. In the proposed method, extended Ethernet frame and bi-directional flooding technique which runs on data plane is introduced. The computer simulation showed that by applying the proposed bi-directional flooding technique, scalability has been greatly increased.

A Design Method of High-availability and Low-optical-loss Optical Aggregation Network Architecture

Takehiro Sato, Kunitaka Ashizawa, Kazumasa Tokuhashi, Daisuke Ishii, Satoru Okamoto, Eiji Oki, YAMANAKA NAOAKI

[International presentation] 1st International Symposium on Access Spaces (IEEE-ISAS 2011) (Yokohama, Japan) ,

2011.06

Oral presentation (general)

A highly-energy-efficient network using an optical aggregation network and a service cloud has been proposed to reduce the power consumption of today’s Internet greatly. The optical aggregation network connects a solitary giant router to users by logical tree topology. This paper proposes a novel optical aggregation network architecture. The proposed architecture uses 2x2 optical switches and combines the features of a tree topology and a ring topology. The paper also introduces a design method of the proposed network architecture. It is shown that the method can design high-availability and low-optical-loss network with fewer optical switches compared to a duplex tree topology.

Experiment of the New Generation Wide-Area Layer-2 Networks over Terabit-LAN Systems

Satoru OKAMOTO, Daisuke ISHII, YAMANAKA NAOAKI

[Domestic presentation] IEICE General Conference (Tokyo City University, Tokyo, Japan) ,

2011.03

Oral presentation (general)

Demonstration of the Self Organized Dynamic Link Power Management by “MiDORi” Energy Optimal Network Topology Design Engine

Hidetoshi Takeshita, Yuji Oikawa, Haruka Yonezu, Daisuke Ishii, Satoru Okamoto, YAMANAKA NAOAKI

[International presentation] The Optical Fiber Communication Conference and Exposition (OFC) and the National Fiber Optic Engineers Conference (NFOEC 2011) (Los Angeles Convention Center, Los Angeles, CA, USA) ,

2011.03

Oral presentation (general)

A Study of Fast Fault Recover Method using k-Hop Flooding for Wide Area Layer2 Network

Rumi AKIMUNE, Jun MATSUMOTO, Jumpei MARUKAWA, Takashi KURIMOTO, Daisuke ISHII, Satoru OKAMOTO,YAMANAKA NAOAKI

[Domestic presentation] IEICE Technical Report on Communication Systems (Okinawa, Japan) ,

2011.03

Oral presentation (general)

A fast fault recovery method using temporary forwarding of frames has been proposed for wide area layer 2 network with high reliability. In the conventional method, the fault detection nodes forward frames based on pre-established recovery table when a fault occurs. The tables, however, are created without consideration on destination node of path, the frames are dropped before the arrival to the destination node. In this paper, a new fast fault recovery method using k-hop flooding is proposed for decrease in frame losses with no arrival to destination node. The proposed method can decrease frame losses with forwarding from fault detection nodes to all neighbor nodes. By computer simulation, it is shown effective range in proposed method from several perspectives.

A Study of Next Generation Metro-Access Hybrid Scalable A Study of Next Generation Metro-Access Hybrid Scalable Network by Using PLZT Ultra High Speed Optical Wavelength Selective Switch

Yutaro HARA, Yuji SHIMADA, Takehiro SATO, Kunitaka ASHIZAWA, Kazumasa TOKUHASHI, Daisuke ISHII, Satoru OKAMOTO,YAMANAKA NAOAKI

[Domestic presentation] IEICE Technical Report (Okinawa, Japan) ,

2011.03

Oral presentation (general)

We study a novel optical access network with active optical switches, called ActiON (Active Optical Network), as a next generation access network to replace PON (Passive Optical Network). In this paper, we focus on a scalability of ActiON so that it accommodates 600000 users to propose next generation metro-access hybrid scalable network by using PLZT optical wavelength selective switch. In the evaluation, we discuss about energy consumption and blocking ratio. We show that proposed network reduces 65 % of energy consumption compare to the present network. Furthermore, blocking ratio of proposed network is always lower than a quality assurance of the Internet service.

Future Smart Network Architecture based on photonic Internet technology

YAMANAKA NAOAKI

[Domestic presentation] IEICE Technical Report (Okinawa, Japan) ,

2011.03

Oral presentation (general)

An Implementation of Optical Multicast Delivery System Using PLZT Optical Switch

Takehiro SATO, Yuji SHIMADA, Yutaro HARA, Johan RENGSTEDT, Kunitaka ASHIZAWA, Kazumasa TOKUHASHI, Daisuke ISHII, Satoru OKAMOTO, YAMANAKA NAOAKI

[Domestic presentation] IEICE Student Workshop on Photonic Network (Kagoshima, Japan) ,

2011.02

Oral presentation (general)

　 Previous page - Next page 　