Analytical Modeling of Offset-Induced Priority in Multiclass OBS Networks

Barakat, N.; Sargent, Edward H.

doi:10.1109/tcomm.2005.852845

Cited by 25 publications

(21 citation statements)

References 19 publications

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“…To simplify computations, however, most OBS performance models do not use Eq. (1) for T off but assume T off to be independent of H and T c p [15][16][17]. Obviously, these performance models are only valid for OBS systems with negligible T c p .…”

Section: Review Of Throughput Degradation Of Optical Burst Switchmentioning

confidence: 99%

Performance Improvement Methods for Burst-Switched Networks

Wai

Li³

2011

J. Opt. Commun. Netw.

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Abstract-In this paper, we present a performance model of optical burst switching (OBS) that can explain the degradation of OBS throughput performance when the control packet processing time increases. We then use the proposed performance model to investigate three feasible methods to improve OBS performance without significantly increasing the implementation complexity: addition of simple fiber delay lines (FDLs), random extra offset time, and window-based channel scheduling (WBS). Additional FDLs can eliminate the negative impact caused by the variation of the offset time between control packets and data bursts. The random extra offset time approach does not require any additional hardware and computational capability in the nodes. If higher computational capability is available, WBS in general can provide better throughput improvement than that of random extra offset time when FDLs are used in the nodes to compensate the processing time. Simulation results show that a combination of the proposed methods can significantly improve OBS performance.

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Section: Review Of Throughput Degradation Of Optical Burst Switchmentioning

confidence: 99%

Performance Improvement Methods for Burst-Switched Networks

Wai

Li³

2011

J. Opt. Commun. Netw.

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“…Analysis showed that the additional QoS offsets have to be in the order of a few mean burst durations [Gau00]. However, offset-based schemes have the drawback that the burst loss probability of the high priority class is very sensitive to burst size characteristics of the low priority class [DG01,BS05a]. Also, offset-based QoS can interfer with resource reservation for FDL buffers (cf.…”

Section: Quality Of Service Differentiationmentioning

confidence: 99%

Novel Network Architecture for Optical Burst Transport

Gauger¹

2009

PIK - Praxis Der Informationsverarbeitung Und Kommunikation

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SummaryTransport networks form the backbone of communication networks by cost-efficiently offering huge bandwidth and by guaranteeing a high service quality and availability. These requirements can best be met by using optical communication technologies. Currently, wavelength-switching is the most prominent network technology employing optical fiber communication and wavelength division multiplexing. It transports data in circuit-switched wavelength channels, the so-called lightpaths. While for years progress in optical networks has been defined by ever increasing transmission bit-rates, higher flexibility and manageability as well as multi-service and multi-layer integration are equally important criteria today. Accounting for these trends, optical burst switching (OBS) has been proposed as a highly dynamic optical network architecture. It offers fine-granular transport of different packet-switched services and applies statistical multiplexing directly in the optical layer.This thesis presents the design, modeling, and evaluation of the optical burst transport network architecture (OBTN). The architecture is motivated by the need for flexible, scalable, and cost-efficient transport in next generation networks. In addition, it is stimulated by the research activities towards highly dynamic optical network infrastructures.OBTN defines a network architecture to transport and switch optical burst data in a core network. The design objectives for the OBTN architecture are (i) an overall high quality of service, (ii) a network design allowing for cost-efficiency and scalability, and (iii) a network evolution perspective based on the current wavelength-switched networks. These objectives are achieved by combining selected concepts, architectures, and strategies of optical burst and optical packet switching as well as of multi-layer traffic engineering.In order to provide the background information for the design of OBTN, Chapter 2 introduces the general characteristics, requirements, and trends for next generation transport networks. Also, it discusses the concept of layering in next generation networks and its application in layer networks for the virtualization of transport resources. Consequently, virtual topology design and dimensioning are analyzed to quantify the trade-offs regarding connectivity and resource requirements. Chapter 2 also reviews the fundamental technologies as well as currently emerging data and control plane architectures for optical transport networks. This presentation is then extended towards a long-term perspective. It describes architectural constraints and classification criteria for highly dynamic optical network architectures. These criteria are used to characterize the fast optical circuit switching, optical burst switching, and optical packet switching architectures. Then, hybrid optical network architectures are discussed as a framework to combine wavelength-switched and optical burst/packet-switched networks.i ii Summary Chapter 3 discusses the state of research and technology for o...

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“…The burst-length dependent losses naturally occur at a switch where a void-filling scheduling algorithm, e.g., LAUC-VF [15], is used and arriving bursts have different residual offset times [18,19]. This is due to the fact that the burst length affects the probability that the burst scheduler will be successful in finding a suitable void for an incoming burst.…”

Section: Effect Of Multiple Assembly Buffering With Void-filling Schementioning

confidence: 99%

Using multiple per egress burstifiers for enhanced TCP performance in OBS networks

Gurel

Karasan

2008

Photon Netw Commun

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Burst assembly mechanism is one of the fundamental factors that determine the performance of an optical burst switching (OBS) network. In this paper, we investigate the influence of the number of burstifiers on TCP performance for an OBS network. The goodput of TCP flows between an ingress node and an egress node traveling through an optical network is studied as the number of assembly buffers per destination varies. First, the burst-length independent losses resulting from the contention in the core OBS network using a non-void-filling burst scheduling algorithm, e.g., Horizon, are studied. Then, burst-length dependent losses arising as a result of void-filling scheduling algorithms, e.g., LAUC-VF, are studied for two different TCP flow models: FTP-type long-lived flows and variable size short-lived flows. Simulation results show that for both types of scheduling algorithms, both types of TCP flow models, and different TCP versions (Reno, Newreno and Sack), TCP goodput increases as the number of burst assemblers per egress node is increased for an OBS network employing timer-based assembly algorithm. The improvement from one burstifier to moderate number of burst assemblers is significant (15-50% depending on the burst loss probability, perhop processing delay, and the TCP version), but the goodput difference between moderate number of buffers and per-flow aggregation is relatively small, implying that an OBS edge A preliminary version of this paper was presented at the Sixth International Workshop on Optical Burst/Packet Switching (WOBS), Oct. 2006.G. Gurel · E. Karasan (B) Department of Electrical and Electronics Engineering, Bilkent University, 06800 Ankara, Turkey e-mail: ezhan@ee.bilkent.edu.tr G. Gurel e-mail: guray@ee.bilkent.edu.tr switch should use moderate number of assembly buffers per destination for enhanced TCP performance without substantially increasing the hardware complexity.

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Analytical Modeling of Offset-Induced Priority in Multiclass OBS Networks

Cited by 25 publications

References 19 publications

Performance Improvement Methods for Burst-Switched Networks

Performance Improvement Methods for Burst-Switched Networks

Novel Network Architecture for Optical Burst Transport

Using multiple per egress burstifiers for enhanced TCP performance in OBS networks

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