Presentations

To improve the energy efficiency of networks, power consumption should be proportional to the utilization of the network. We have proposed a concept which conducts traffic engineering in order to dynamically aggregate traffic on particular links and turn off unused links. This paper shows the demonstration results of the link power management by energy efficient network topology design with prototype Gigabit layer-2 switches. In the result, power consumption adaptively changed according to amount of traffic, and when traffic load is low, it can reduce of 23.8% of energy at maximum.

This paper proposes a novel traffic engineering method for improving the throughput characteristics of optical packet forwarding in an optical packet / path integrated network. This method is based on bypassing optical packets rejected from a highly-loaded optical packet switch onto one of the adjacent packet switches via an optical path to increase the network throughput. Since the formation of a bypass is equivalent to sharing the buffers of two or more optical packet switches, the packet loss rate can be reduced even by the same buffer length. Or the buffer length can be reduced to achieve the given packet loss rate.

While being the nearness of realization of ubiquitous society, it is expected that everything will be connected to the network. We previously presented “Ubiquitous Grid Networking Environment (uGrid)”. In uGrid, everything on the network such as devices, contents, and software is defined as “Service-Part”, and users are provided with composition of the several Service-Parts on the network. In uGrid, there are “Service-Routing” and “Service-Signaling” as the method of determining the path from source to destination and establishing the optical path by using of IP protocol. However, in uGrid, in order to provide the services for users via the specified Service-Parts, these cost of services is high. Also, since users must designate the combination of Service-Parts, it is inflexible. Then, we propose “Energy Efficient, and Enhanced-type Data Centric Network (E3-DCN)” which is based on uGrid. In the E3-DCN, users request contents name to the network and receive them from the network. If the requested contents are not found in the network, the network constructs the requested contents with Service-Parts. In addition to that, E3-DCN aims at energy efficiency. In this paper, we propose a cost reduction method by Service-Parts copy as part of E3-DCN. Cost is reduced by copying the Service-Parts which have a software function to the optimal position. This method is defined as “Service-Copy”. By the evaluation using ILP (Integer Linear Programming), it is shown that the case with Service-Copy can reduce the total cost of service by about 12～17%.

We have proposed an active optical access network (ActiON) employing high-speed optical switches that ensures a higher subscriber number and longer transmission distance than those in the case of the conventional PON. Moreover, ActiON supports multicast slot allocation, which forces the switch to behave as an optical splitter. This paper introduces ActiON with variable distribution mode, which controls the distribution rate of the power. Proposed method realizes flexible multicast slot allocation according to the transmission distance from OLT to each user and the number of required users. Moreover, as the technology to realize the proposed method, this paper also shows adjusting of the proportion of optical power by applying the variable voltage to each electrode.

This paper outlines and demonstrates the authors’ view on the service model, architectural directions and key protocols for future cloud realized by utilizing the inscrutable possibility of the photonic network. It is pointed out that, driven by evolution of Cloud and Ubiquitous society, all services will be provisioned by and through an intelligent network where service resources are distributed. For this trend, we propose Multi- Service Cooperating Cloud (MSCC) provides various virtual clouds dynamically according to users’ requests by interconnecting multi service resources via network. The network architecture for realizing MSCC, which uses the network virtualization and extended IP protocol, is also introduced. The feature of our proposing architecture concept is to assign IP addresses to Service-Parts and execute MSCC service provisioning by utilizing IP mechanisms. By using IP mechanism, the construction of scalable and intelligent service network is expected.

Recently, access network consumes almost 70% electricity of the whole network in Japan, and the low-power-consumption technologies such as ONU Sleep Mode get more popular. In this study, in terms of the ONU's power consumption, we would like to propose a new ONU Sleep Mode in which OLT informs both up/down schedules before sending data so that a part of devices in ONU is able to sleep with using the schedules. Then, we discuss an AWG-PON based optical access network for low power consumption.

With the development of network and device technology, the era that any device can be connected to the network has been expected. So we have proposed a ”ubiquitous grid networking environment (uGrid)” to meet the era need. In uGrid, everything from a device to a program is defined as ”Service-Part”, and by combining various Service-Parts, uGrid can provide a variety of composite services to users. About the video delivery system based on uGrid, the videos, which are processed by some Service-Parts from video server, are provided to users. Therefore, it is necessary to construct the tree, which is used for picking the appropriate Service-Parts from the server to users. However, using the minimum cost paths of each user to build the minimum cost path tree, the usage of amount of Service-Parts will be increased, and the resource utilization of each Service-Part will become very low. So, in this paper, we propose a tree construction method, which ensures that the biggest delay as a prerequisite, by repeatedly running the local aggregation to improve the utilization efficiency of Service-Part. This paper also presents some evaluations which the results show that our proposal is better than traditional approach in the utilization efficiency of Service-Part.

Recently, the Internet is necessary tool for our daily lives, and the number of the Internet users is increasing particularly quickly. Reflecting this trend, the amount of traffic and power consumption of network is increasing. To save the energy of network is a critical issue. One of the concepts of saving the energy is to realize a low power consumption network by aggregating traffic into specific links and powering off interfaces of routers/switches that do not carry traffic. However, a calculation method of this algorithm takes a lot of time to deal with a large network topology. In this paper, we propose a platform that processes the calculation of energy efficient topology rapidly using reconfigurable processor, STP. We use this reconfigurable device for calculation of the link utilization, it takes a lot of time of whole process of this algorithm. We show the possibility that our proposal can execute arithmetic processing faster than a usual software.

We foresee continuous increase in network traffic due to media streaming services and smart phones, and also future increase in M2M (Machine-to-Machine) data traffic such as sensor networks. On the other hand, improving the energy consumption of the network itself will be one of the important requirements in the future. In this presentation, we introduce a new network architecture called E3-DCN(Energy Efficient, and Enhanced-type Data Centric Network) which optimizes energy consumption within data-centric network.

ネットワークの省エネルギー化について, Access網のLow Power化と新しいデータセンタ型の光アグリゲーションネットワークのアーキテクチャを述べた.

我々は, サービスパーツと定義するネットワーク上のあらゆるハードウェア, コンテンツおよびソフトウェアを組み合わせ, ユーザに提供するユビキタスグリッドネットワーキング環境(uGrid) を提案している. 近年, ネットワークにコンテンツ名で要求してコンテンツを受信するData Centric Network (DCN) が広く研究されている. そこで, uGrid にDCN を拡張させたEnergy Efficient, and Enhanced-type Data Centric Network (E3-DCN) を提案する. E3-DCN では, ユーザが要求したコンテンツを必要に応じてサービスパーツを組み合わせて提供する. さらに, エネルギー効率化を目指す. 本稿ではE3-DCN の一環として, サービスパーツのソフトウェアを最適な位置に一時的にコピーすることによるエネルギー効率化手法を提案する. 整数線形計画法を用いて, サービスパーツのコピー機能の有無におけるエネルギー効率化に関して評価を行う.

A network using minimum set of nodes and links that all communication data traffics among nodes can be carried while meeting the QoS requirements named MiDORi (Multi- (layer, path, and resources) Dynamically Optimized Routing) has been proposed. MiDORi network technologies that is composed of a low energy consumption network design tool (MiDORi path computation engine (PCE)), MiDORi Generalized Multi-Protocol Label Switching (GMPLS) protocol extensions for controlling network equipment, and a MiDORi router/switch controlled by MiDORi GMPLS, are now developing. This paper describes recent activities of the MiDORi network technologies.

This paper proposes a new traffic engineering method for increasing the throughput of optical packet transmission in an optical packet / path integrated network. This method reroutes the optical packet rejected from a highly loaded optical packet switch onto one of the adjacent packet switches via an optical path to increase the network throughput. Since the formation of a detour is equivalent to sharing the buffers of two or more optical packet switches, the packet loss rate can be reduced even by the same buffer length. Or the buffer length can be reduced to achieve the given packet loss rate.

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.

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.

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.

The most of demand response programs are developed in view of electric power companies.But the customers may not reserve their demands because there are non-guaranteed the benefi t of reservation.In this paper, we propose new smart grid architecture and reservation algorithm.The objective is smoothing demands and guarantee the bene t of reservation while delaying their demands.

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.

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.