Dissertation•
Quality of service estimation techniques for an optical virtual private network over wdm/dwdm network
01 Dec 2014-
TL;DR: Four different QoS estimation techniques have been proposed here and it is important to understand the process and provide the network as well as the PLI information to the OVPNCM and use this information efficiently to compute feasible connections along with Q-Factor values.
Abstract: Quality of Service (QoS) in optical virtual private network (OVPN) is a demanding factor for communication network application. To provide desired QoS, the control plane
in an all optical network (AON) has to be designed to maximize the quality of an OVPN connections (OVPNC). The AON is generally characterized by various network and physical layer parameters, which are used by the OVPN control manager (OVPNCM) for the estimation of quality factor (Q-Factor) for a set of possible OVPNC. It is observed that, not only the network layer parameters, but also the physical layer parameters called as physical layer impairments (PLIs) have impact on connection quality. In optical networks, the PLIs are incurred by non-ideal optical transmission media and accumulate along the optical connection. The overall effect of PLIs can be analyzed to determine the feasibility of quality based OVPNC. It is important to understand the process and provide the network as well as the PLI information to the OVPNCM and use this information efficiently to compute feasible connections along with Q-Factor values. Based on these, four different QoS estimation techniques have been proposed here.
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01 May 2019
TL;DR: Accounting for system virtualization, which is currently being supported by modern operating systems, is presented and architecture for optical virtual private network (OVPN) emulation platform is presented.
Abstract: Network emulation is an important tool before doing experiments on real-time hardware. In case of unavailability of test-bed for optical networks such simulation platform are of great help. Accounting for system virtualization, which is currently being supported by modern operating systems, we present architecture for optical virtual private network (OVPN) emulation platform. In OVPN, Quality of Service (QoS) decides the performance of communication system. To get more accurate QoS, various network and physical layer parameters are considered and based of the highest QoS value and a threshold, best route calculation is derived. So it is thought of interest to develop a network emulation platform for QoS based OPVN path evaluation of optical networks. This tool can help with the calculations and estimations of path, way prior to real-time implementations and deployments.
1 citations
Cites background or methods from "Quality of service estimation techn..."
...Also, the ETED depends on fiber wavelength composition as explained elsewhere [13], can be expressed as;...
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...The QoS or the Q-Factor is calculated based on finermaterial and dispersion as explained [13]...
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References
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Book•
01 Jan 1985TL;DR: This chapter discusses Adaptive Arrays and Adaptive Beamforming, as well as other Adaptive Algorithms and Structures, and discusses the Z-Transform in Adaptive Signal Processing.
Abstract: GENERAL INTRODUCTION. Adaptive Systems. The Adaptive Linear Combiner. THEORY OF ADAPTATION WITH STATIONARY SIGNALS. Properties of the Quadratic Performance Surface. Searching the Performance Surface. Gradient Estimation and Its Effects on Adaptation. ADAPTIVE ALGORITHMS AND STRUCTURES. The LMS Algorithm. The Z-Transform in Adaptive Signal Processing. Other Adaptive Algorithms and Structures. Adaptive Lattice Filters. APPLICATIONS. Adaptive Modeling and System Identification. Inverse Adaptive Modeling, Deconvolution, and Equalization. Adaptive Control Systems. Adaptive Interference Cancelling. Introduction to Adaptive Arrays and Adaptive Beamforming. Analysis of Adaptive Beamformers.
5,645 citations
Book•
01 Jan 1998TL;DR: The second edition of Optical Networks: A Practical Perspective succeeds the first as the authoritative source for information on optical networking technologies and techniques as discussed by the authors, covering componentry and transmission in detail but also emphasizing the practical networking issues that affect organizations as they evaluate, deploy, or develop optical solutions.
Abstract: This fully updated and expanded second edition of Optical Networks: A Practical Perspective succeeds the first as the authoritative source for information on optical networking technologies and techniques. Written by two of the field's most respected individuals, it covers componentry and transmission in detail but also emphasizes the practical networking issues that affect organizations as they evaluate, deploy, or develop optical solutions.
2,282 citations
"Quality of service estimation techn..." refers background in this paper
...Delay due to the effect of PMD: The differential time delay for a fiber link due to the effect of PMD can be expressed [16] as DPMD (i, j) = DSPMD (i, j)× √...
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...2 Optical Virtual Private Network VPN is a virtual circuit (VC) and can be defined as an end to end connection with a set of quality of transmission parameters associated with it [16]....
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...Delay due to WGD: Time delay due to WGD can be represented [16, 65] as...
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...Delay due to the effect of CD: The time delay incurred in optical fiber link (i, j) due to CD can be expressed [16] as DCD (i, j) = DSCD (i, j)× L (i, j)× λl (i, j) (4....
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...PLIs encountered in WDM/DWDM networks can be classified into two categories: Linear Impairments (LIs) and Non-Linear Impairments (NLIs) [8,16,22]....
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01 Jan 2000
TL;DR: In this paper, a distributed relative capacity loss (DRCL) scheme is proposed for wavelength-routed optical WDM networks, which works well in distributed controlled networks and demonstrates the performance of DRCL through simulation.
Abstract: This study focuses on the routing and WavelengthAssignment (RWA) problem in wavelength-routed optical WDM networks. Most of the attention is devoted to such networks operating under the wavelength-continuity constraint, in which lightpaths are set up for connection requests between node pairs, and a single lightpath must occupy the same wavelength on all of the links that it spans. In setting up a lightpath, a route must be selected and a wavelength must be assigned to the lightpath. If no wavelength is available for this lightpath on the selected route, then the connection request is blocked. We examine the RWA problem and review various routing approaches and wavelengthassignment approaches proposed in the literature. We also briefly consider the characteristics of wavelength-converted networks (which do not have the wavelength-continuity constraint), and we examine the associated research problems and challenges. Finally, we propose a new wavelengthassignment scheme, called Distributed Relative Capacity Loss (DRCL), which works well in distributed-controlled networks, and we demonstrate the performance of DRCL through simulation.
1,723 citations
"Quality of service estimation techn..." refers background in this paper
...Fixed Routing (FR): Fixed routing is a technique in which a single lightpath for the given source-destination pair is computed [27]....
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TL;DR: The authors derive an upper bound on the carried traffic of connections for any routing and wavelength assignment (RWA) algorithm in a reconfigurable optical network and quantifies the amount of wavelength reuse achievable in large networks as a function of the number of wavelengths, number of edges, and number of nodes for randomly constructed networks as well as de Bruijn networks.
Abstract: Considers routing connections in a reconfigurable optical network using WDM. Each connection between a pair of nodes in the network is assigned a path through the network and a wavelength on that path, such that connections whose paths share a common link in the network are assigned different wavelengths. The authors derive an upper bound on the carried traffic of connections (or equivalently, a lower bound on the blocking probability) for any routing and wavelength assignment (RWA) algorithm in such a network. The bound scales with the number of wavelengths and is achieved asymptotically (when a large number of wavelengths is available) by a fixed RWA algorithm. The bound can be used as a metric against which the performance of different RWA algorithms can be compared for networks of moderate size. The authors illustrate this by comparing the performance of a simple shortest-path RWA (SP-RWA) algorithm via simulation relative to the bound. They also derive a similar bound for optical networks using dynamic wavelength converters, which are equivalent to circuit-switched telephone networks, and compare the two cases. Finally, they quantify the amount of wavelength reuse achievable in large networks using the SP-RWA via simulation as a function of the number of wavelengths, number of edges, and number of nodes for randomly constructed networks as well as de Bruijn networks. They also quantify the difference in wavelength reuse between two different optical node architectures. >
1,046 citations
TL;DR: A resource reservation protocol (RSVP), a flexible and scalable receiver-oriented simplex protocol, that provides receiver-initiated reservations to accommodate heterogeneity among receivers as well as dynamic membership changes and supports a dynamic and robust multipoint-to-multipoint communication model.
Abstract: A resource reservation protocol (RSVP), a flexible and scalable receiver-oriented simplex protocol, is described. RSVP provides receiver-initiated reservations to accommodate heterogeneity among receivers as well as dynamic membership changes; separates the filters from the reservation, thus allowing channel changing behavior; supports a dynamic and robust multipoint-to-multipoint communication model by taking a soft-state approach in maintaining resource reservations; and decouples the reservation and routing functions. A simple network configuration with five hosts connected by seven point-to-point links and three switches is presented to illustrate how RSVP works. Related work and unresolved issues are discussed. >
872 citations