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27
Virtual-topology adaptation for WDM mesh networks under dynamic traffic
- IEEE/ACM Transactions on Networking
, 2002
"... Abstract — We present a new approach to the virtual-topology reconfiguration problem for wavelength-routed, optical wide-area networks under dynamic traffic demand. By utilizing the measured Internet backbone traffic characteristics, an adaptation mechanism is proposed to follow the changes in traff ..."
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Abstract — We present a new approach to the virtual-topology reconfiguration problem for wavelength-routed, optical wide-area networks under dynamic traffic demand. By utilizing the measured Internet backbone traffic characteristics, an adaptation mechanism is proposed to follow the changes in traffic without assuming that the future traffic pattern is known. In that sense, our work differs from the previous studies which redesign the virtual-topology according to an expected (or known) traffic pattern, and then modify the connectivity to reach the target topology. The key idea of our approach is to adapt the underlying optical connectivity by measuring the actual traffic load on lightpaths continuously (periodically based on a measurement period) and reacting promptly to the imbalances caused by fluctuations on the traffic by adding or deleting one lightpath at a time. We aim to correct the encountered load imbalance directly, either by tearing down a lightpath that is lightly loaded or by setting up a new lightpath when congestion occurs. We introduce high and low watermark parameters on lightpath loads to detect any over/underutilized lightpath, and to trigger an adaptation step. The adaptation method is evaluated through simulations and the effect of system parameters (high and low watermarks, length of the measurement period) are investigated. I.
Traffic-based reconfiguration for logical topologies in large-scale WDM optical networks
- Journal of Lightwave Technology
"... has emerged as a promising technology for backbone networks. ..."
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has emerged as a promising technology for backbone networks.
Core Principles for Systemically Important Payment Systems
- Computer Communications and Networks, 2002. Proceedings. Eleventh International Conference on, October 2002
, 1999
"... Abstract — An analytical model for Virtual Topology Reconfiguration (VTR) in optical networks is developed. It aims at the optical networks with a circuit-based data plane and an IP-like control plane. By identifying and analyzing the important factors impacting the network performance due to VTR op ..."
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Abstract — An analytical model for Virtual Topology Reconfiguration (VTR) in optical networks is developed. It aims at the optical networks with a circuit-based data plane and an IP-like control plane. By identifying and analyzing the important factors impacting the network performance due to VTR operations on both planes, we can compare the benefits and penalties of different VTR algorithms and policies. The best VTR scenario can be adaptively chosen from a set of such algorithms and policies according to the real-time network situations. For this purpose, a cost model integrating all these factors is created to provide a comparison criterion independent of any specific VTR algorithm and policy. A case study based on simulation experiments is conducted to illustrate the application of our models. I.
Rouzic, “Algorithms for the multi-period power-aware logical topology design with reconfiguration costs
- Journal of Optical Communications and Networking
, 2013
"... Abstract—We tackle the problem of reducing power con- ..."
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Cited by 4 (4 self)
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Abstract—We tackle the problem of reducing power con-
Coarse optical circuit switching by default, rerouting over circuits for adaptation
, 2009
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Optimal reconfiguration of provisioning oriented optical networks
"... Today and in the foreseeable future optical networks are and will be used to implement the transport layer in telecommunications networks. If in a distributed environment the arrivals of permanent (long lasting) optical channel demands are distributed and independent in time and space, the service m ..."
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Today and in the foreseeable future optical networks are and will be used to implement the transport layer in telecommunications networks. If in a distributed environment the arrivals of permanent (long lasting) optical channel demands are distributed and independent in time and space, the service must also be demand-driven and real-time. The applicable online provisioning algorithms, despite their efficiency, lead to a suboptimal network configuration, where the network performance strongly depends on the random arrival sequence of demands. To improve the capacity efficiency of the evolved network configuration a consolidation step must be applied after a certain number of demands arrived. The consolidation is a limited network reconfiguration to improve the capacity efficiency of the network configuration by means of changing pre-planned or on-line defined architectural parameters. The consolidation process can be based on the results of an off-line design algorithm, which may be either an exact or a heuristic method. The present paper summarizes the measures and algorithms of reconfiguration that can be found in the literature. Then the grounds and applicability of the consolidation approach is illustrated over two on-line optical channel provisioning strategies. The presented numerical results demonstrate the capacity gain achieved by means of the network consolidation step. Index terms: optical networks, on-line (OCH) provisioning, capacity efficiency, network consolidation. 1 Introduction and
Dynamic Hybrid Topology Design for Integrated Traffic Support in WDM Mesh Networks
"... The future Internet will require the transport of a wide range of services including high bandwidth one-to-many applications, with a dynamic interconnection of devices. WDM layer support realizes such services in a transparent, reliable and efficient way. Most of the recent studies have been focused ..."
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The future Internet will require the transport of a wide range of services including high bandwidth one-to-many applications, with a dynamic interconnection of devices. WDM layer support realizes such services in a transparent, reliable and efficient way. Most of the recent studies have been focused on efficiently building and configuring light-paths for unicast or light-trees for multicast in isolation, and do not take existing traffic demands and configuration into consideration. In this paper we consider a dynamic design problem of integrated traffic in a realistic WDM mesh network. In such a network, new traffic demands of either multicast and/or unicast are supported dynamically in the presence of an existing mixture of traffic. The amount of bandwidth per wavelength is abundant, while the wavelengths and light splitting capabilities on WDM switches are limited. Using subwavelength sharing among traffic demands of unicast and multicast, we build a hybrid virtual topology that exploits both existing light-trees and light-paths. By optimizing WDM resources in addition to resource sharing with existing unicast and multicast demands, we truly maximize the WDM layer capability and efficiently support more traffic demands. We validate the efficiency of our approach with extensive simulations on various network topologies.
HYBRID NODAL ARCHITECTURE FOR TRAFFIC GROOMING IN WDM NETWORKS
"... Abstract: Multiple node architectures are possible for WDM networks. These architectures strongly condition the cost of optical network planning and traffic engineering. This paper aims first to introduce the four optical switching systems currently considered; namely Optical Cross-Connect (OXC), Op ..."
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Abstract: Multiple node architectures are possible for WDM networks. These architectures strongly condition the cost of optical network planning and traffic engineering. This paper aims first to introduce the four optical switching systems currently considered; namely Optical Cross-Connect (OXC), Optical Circuit Switching (OCS), Optical Packet Switching (OPS), and Optical Burst Switching (OBS). Then a detailed description of a multi-layer EXC/OXC node architecture is presented. Such architecture can handle full-wavelength circuits as well as sub-wavelength electrical connections. The major functionalities of this EXC/OXC node (add, drop, switching, and grooming) are modeled by means of an auxiliary graph. I.
WDM optical network reconfiguration using automated regression-based parameter value selection
- 3rd International Conference on Networking
, 2004
"... ..."
Heuristic Approaches for Periodic Reconfiguration of Lightpath-based Networks under Multi-hour Traffic
"... Abstract—Periodic lightpath reconfiguration of virtual topologies in transparent optical networks has been recently investigated as a mechanism to more efficiently adapt the network to predictable periodic traffic variations along a day or week. Scheduling periodic reconfigurations involves tuning a ..."
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Abstract—Periodic lightpath reconfiguration of virtual topologies in transparent optical networks has been recently investigated as a mechanism to more efficiently adapt the network to predictable periodic traffic variations along a day or week. Scheduling periodic reconfigurations involves tuning a trade-off between a lower network cost obtained through better resource allocation, and undesired traffic disruptions that these reconfigurations may cause. This paper presents and compares two algorithms for planning a reconfigurable virtual topology suitable for exploring this trade-off. The first is based on a Lagrangean Relaxation of the planning problem, and the second is based on a Tabu Search meta-heuristic. The merits of both algorithms are assessed for moderate network sizes through comparison with analytical lower bounds and exact solutions obtained by a MILP formulation. Index Terms—virtual topology design, network planning,
