The Experts below are selected from a list of 513 Experts worldwide ranked by ideXlab platform

Akira Misawa - One of the best experts on this subject based on the ideXlab platform.

  • dynamic path bandwidth allocation for 1000 10 scale optical Layer 2 Switch network based on hierarchical timeslot allocation algorithm and timeslot converter
    European Conference on Optical Communication, 2013
    Co-Authors: Kyota Hattori, Masahiro Nakagawa, Naoki Kimishima, Masaru Katayama, Akira Misawa
    Abstract:

    We are developing optical Layer-2 Switch network that achieves dynamic path bandwidth allocation (DPBA) for efficient aggregation in metro NWs. We show the experimental results of DPBA cycle according to variations in traffic on NW scale of 1000×10.

  • Hierarchical timeslot allocation for optical Layer-2 Switch network
    2013 18th OptoElectronics and Communications Conference held jointly with 2013 International Conference on Photonics in Switching, 2013
    Co-Authors: Masahiro Nakagawa, Kyota Hattori, Naoki Kimishima, Masaru Katayama, Akira Misawa
    Abstract:

    We propose a novel timeslot allocation method that utilizes hierarchical calculation. This method has a shorter computation time and enables dynamic path control in 1K-node-scale optical Layer-2 Switch network system, leading to cost-effective metro networks.

  • Dynamic path bandwidth allocation for 1000×10-scale optical Layer-2 Switch network based on hierarchical timeslot allocation algorithm and timeslot converter
    39th European Conference and Exhibition on Optical Communication (ECOC 2013), 2013
    Co-Authors: Kyota Hattori, Masahiro Nakagawa, Naoki Kimishima, Masaru Katayama, Akira Misawa
    Abstract:

    We are developing optical Layer-2 Switch network that achieves dynamic path bandwidth allocation (DPBA) for efficient aggregation in metro NWs. We show the experimental results of DPBA cycle according to variations in traffic on NW scale of 1000×10.

  • proposal of scale out control architecture of virtual wide area Layer 2 Switch on metro network
    Asia-Pacific Conference on Communications, 2013
    Co-Authors: Hiroki Date, Masaru Katayama, Kenichi Higuchi, Akira Misawa
    Abstract:

    Power consumption of network equipment has been rapidly increasing, so it is therefore necessary to build a resource efficient network (NW). Router virtualization, which involves dynamically reallocating virtual routers to physical resources as a server virtualization, is becoming more common as a way to use network equipment effectively and robustly. Especially, edge router which is gateway of core network should be virtualized, because edge routers have many functions and resources just as servers do. A metro NW is wide area Layer-2 aggregation NW that connects each user's residential gateway to edge routers. To achieve edge router virtualization, the metro NW must trace the dynamic edge router reallocation by changing a route of each Ethernet flow. Furthermore, access/metro NWs occupy a large proportion of the total NW power consumption, so logically centralized control architecture suits to the metro NW to change routes flexibly because it can use resources effectively by avoiding resource deployment in many locations. However, it is not scalable. When many Ethernet flows need to be accommodated in a metro NW, it can not change routes of the flows quickly enough. Therefore, we propose a virtual wide area Layer-2 Switch architecture with scale-out control that can improve the route control performance even in a worst case edge router node failure by processing in parallel flow-by-flow, by considering route information, and by rebalancing the load between parallel processes dynamically. We evaluated the proposed architecture through theoretical analysis and experiments with prototype. The results showed that the proposed architecture can increase the number of flows accommodated in a metro NW.

  • APCC - Proposal of scale-out control architecture of virtual wide area Layer-2 Switch on metro network
    2013 19th Asia-Pacific Conference on Communications (APCC), 2013
    Co-Authors: Hiroki Date, Masaru Katayama, Kenichi Higuchi, Akira Misawa
    Abstract:

    Power consumption of network equipment has been rapidly increasing, so it is therefore necessary to build a resource efficient network (NW). Router virtualization, which involves dynamically reallocating virtual routers to physical resources as a server virtualization, is becoming more common as a way to use network equipment effectively and robustly. Especially, edge router which is gateway of core network should be virtualized, because edge routers have many functions and resources just as servers do. A metro NW is wide area Layer-2 aggregation NW that connects each user's residential gateway to edge routers. To achieve edge router virtualization, the metro NW must trace the dynamic edge router reallocation by changing a route of each Ethernet flow. Furthermore, access/metro NWs occupy a large proportion of the total NW power consumption, so logically centralized control architecture suits to the metro NW to change routes flexibly because it can use resources effectively by avoiding resource deployment in many locations. However, it is not scalable. When many Ethernet flows need to be accommodated in a metro NW, it can not change routes of the flows quickly enough. Therefore, we propose a virtual wide area Layer-2 Switch architecture with scale-out control that can improve the route control performance even in a worst case edge router node failure by processing in parallel flow-by-flow, by considering route information, and by rebalancing the load between parallel processes dynamically. We evaluated the proposed architecture through theoretical analysis and experiments with prototype. The results showed that the proposed architecture can increase the number of flows accommodated in a metro NW.

Masaru Katayama - One of the best experts on this subject based on the ideXlab platform.

  • Fast Bandwidth-Variable Path Restoration Method for Optical Layer-2 Switch Network
    Advanced Photonics for Communications, 2014
    Co-Authors: Masahiro Nakagawa, Kyota Hattori, Masaru Katayama, Hiroaki Ogawa
    Abstract:

    We propose a fast restoration method for bandwidth-variable paths against single link failure in large-scale networks. This method achieves 50-ms service recovery time in 10K-path-scale ring networks while suppressing required network resources.

  • dynamic path bandwidth allocation for 1000 10 scale optical Layer 2 Switch network based on hierarchical timeslot allocation algorithm and timeslot converter
    European Conference on Optical Communication, 2013
    Co-Authors: Kyota Hattori, Masahiro Nakagawa, Naoki Kimishima, Masaru Katayama, Akira Misawa
    Abstract:

    We are developing optical Layer-2 Switch network that achieves dynamic path bandwidth allocation (DPBA) for efficient aggregation in metro NWs. We show the experimental results of DPBA cycle according to variations in traffic on NW scale of 1000×10.

  • Hierarchical timeslot allocation for optical Layer-2 Switch network
    2013 18th OptoElectronics and Communications Conference held jointly with 2013 International Conference on Photonics in Switching, 2013
    Co-Authors: Masahiro Nakagawa, Kyota Hattori, Naoki Kimishima, Masaru Katayama, Akira Misawa
    Abstract:

    We propose a novel timeslot allocation method that utilizes hierarchical calculation. This method has a shorter computation time and enables dynamic path control in 1K-node-scale optical Layer-2 Switch network system, leading to cost-effective metro networks.

  • Dynamic path bandwidth allocation for 1000×10-scale optical Layer-2 Switch network based on hierarchical timeslot allocation algorithm and timeslot converter
    39th European Conference and Exhibition on Optical Communication (ECOC 2013), 2013
    Co-Authors: Kyota Hattori, Masahiro Nakagawa, Naoki Kimishima, Masaru Katayama, Akira Misawa
    Abstract:

    We are developing optical Layer-2 Switch network that achieves dynamic path bandwidth allocation (DPBA) for efficient aggregation in metro NWs. We show the experimental results of DPBA cycle according to variations in traffic on NW scale of 1000×10.

  • proposal of scale out control architecture of virtual wide area Layer 2 Switch on metro network
    Asia-Pacific Conference on Communications, 2013
    Co-Authors: Hiroki Date, Masaru Katayama, Kenichi Higuchi, Akira Misawa
    Abstract:

    Power consumption of network equipment has been rapidly increasing, so it is therefore necessary to build a resource efficient network (NW). Router virtualization, which involves dynamically reallocating virtual routers to physical resources as a server virtualization, is becoming more common as a way to use network equipment effectively and robustly. Especially, edge router which is gateway of core network should be virtualized, because edge routers have many functions and resources just as servers do. A metro NW is wide area Layer-2 aggregation NW that connects each user's residential gateway to edge routers. To achieve edge router virtualization, the metro NW must trace the dynamic edge router reallocation by changing a route of each Ethernet flow. Furthermore, access/metro NWs occupy a large proportion of the total NW power consumption, so logically centralized control architecture suits to the metro NW to change routes flexibly because it can use resources effectively by avoiding resource deployment in many locations. However, it is not scalable. When many Ethernet flows need to be accommodated in a metro NW, it can not change routes of the flows quickly enough. Therefore, we propose a virtual wide area Layer-2 Switch architecture with scale-out control that can improve the route control performance even in a worst case edge router node failure by processing in parallel flow-by-flow, by considering route information, and by rebalancing the load between parallel processes dynamically. We evaluated the proposed architecture through theoretical analysis and experiments with prototype. The results showed that the proposed architecture can increase the number of flows accommodated in a metro NW.

Kyota Hattori - One of the best experts on this subject based on the ideXlab platform.

Masahiro Nakagawa - One of the best experts on this subject based on the ideXlab platform.

Hisaya Hadama - One of the best experts on this subject based on the ideXlab platform.

  • APCC - Multilevel dynamic bandwidth allocation using buffer observation for cousin-fair access systems
    The 17th Asia Pacific Conference on Communications, 2011
    Co-Authors: Ujikawa Hirotaka, Naoto Yoshimoto, Sakamoto Takeshi, Hisaya Hadama
    Abstract:

    This paper proposes two techniques for reducing the buffer size and computational complexity of an aggregation Layer-2 Switch (L2SW) in access systems by using buffer observation and multilevel dynamic bandwidth allocation (DBA). The conventional architecture for providing cousin fairness, which realizes fairness among multiple passive optical network (PON) branches, needs a huge buffer in an L2SW that depends on the number of optical network units (ONUs). Our proposal reduces the required buffer size for an L2SW that depends on the number of optical subscriber units (OSUs), which is much smaller than the number of ONUs. The proposed techniques reduce by more than two thirds the amount of unfairly distributed bandwidth caused by the lack of cousin fairness. A simulation result obtained with our proposed approach shows improved cousin fairness among multiple PON branches with a smaller buffer.

  • novel sleep control for epon optical line terminal employing Layer 2 Switch functions
    Global Communications Conference, 2010
    Co-Authors: Satoshi Shimazu, Junichi Kani, Naoto Yoshimoto, Hisaya Hadama
    Abstract:

    This paper proposes a sleep control function for power saving in the optical line terminal (OLT) of an Ethernet passive optical network (EPON) employing duplicated Layer-2 Switches (L2SWs). The basic idea is to make one of the duplicated L2SW sleep according to the amount of traffic. Furthermore, this paper proposes a novel sleep control function that uses dynamic bandwidth allocation (DBA) information. The proposed sleep control function calculates the traffic in advance from the DBA information, and Switches one of the duplicated L2SW between active and sleep mode based on the accurate traffic predictions. The proposed control function provides exact predictions of the upstream traffic, thus eliminating excess latency due to prediction error. Numerical simulations show the validity of the sleep control proposal.

  • GLOBECOM - Novel Sleep Control for EPON Optical Line Terminal Employing Layer-2 Switch Functions
    2010 IEEE Global Telecommunications Conference GLOBECOM 2010, 2010
    Co-Authors: Satoshi Shimazu, Junichi Kani, Naoto Yoshimoto, Hisaya Hadama
    Abstract:

    This paper proposes a sleep control function for power saving in the optical line terminal (OLT) of an Ethernet passive optical network (EPON) employing duplicated Layer-2 Switches (L2SWs). The basic idea is to make one of the duplicated L2SW sleep according to the amount of traffic. Furthermore, this paper proposes a novel sleep control function that uses dynamic bandwidth allocation (DBA) information. The proposed sleep control function calculates the traffic in advance from the DBA information, and Switches one of the duplicated L2SW between active and sleep mode based on the accurate traffic predictions. The proposed control function provides exact predictions of the upstream traffic, thus eliminating excess latency due to prediction error. Numerical simulations show the validity of the sleep control proposal.