Efficient Control Routing and Wavelength Assignment in Loss-Less Optical Burst Switching Networks (original) (raw)
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Performance analysis of an optical burst switching (OBS) network
2008 International Conference on Electrical and Computer Engineering, 2008
The development of wavelength division multiplexing opens a new horizon in optical networks and promises to be one of the best solutions for the high demand of the bandwidth. However, with this technology, many problems arise, especially those related to the architecture to be used in optical networks to take advantage of the huge potential of this technique. Many approaches and architectures have been proposed in literatures to carry information in optical domain. Among them, optical burst switching (OBS) and wavelength routed network seems to be the most successful. We propose a new novel architecture that uses both methods in order to overcome the limitations imposed by each approach. The proposed architecture deploys bursty traffic in a hybrid fashion where implicitly predicted and explicitly pre-booked traffic are dynamically allocated reserved end-to-end paths, inheriting the spirit of conventional wavelength routing; whilst, the non-predicted traffic is transmitted via classical OBS reservation mechanism(s) with the best efforts support. The complete network structure alongwith load-balancing prior reservation strategy is presented. Simulation results reveal the performance of the proposed work by examining the blocking probability and delay characteristics. The encouraging results provide stimulation for further work on optimal traffic placement, QoS provisioning, and various apriori resource reservation strategies.
Analysis and design of optical burst switching networks
2005
Optical Burst Switching (OBS) is a hybrid technique between coarse grain optical circuit switching and fine grain optical packet switching. In OBS networks, user data is switched entirely in the optical domain, while control and management functions are performed in the electrical domain. This separation of the data plane and the control plane allows OBS networks to provide reasonably high levels of utilization while circumventing the need for optical buffering. In spite of OBS favorable features, several issues need to be addressed before OBS can be deployed in the Internet backbone. The objectives of this thesis are twofold: devise new methods for quality-of-service (QoS) provisioning in OBS networks, and develop new wavelength scheduling algorithms for enhancing the blocking probability in OBS networks. QoS provisioning is a major research problem in OBS networks. This is mainly because of the absence of the concept of "packet queues" in OBS networks. This thesis proposes two approaches for QoS provisioning in OBS networks. The first approach is a simple, yet effective scheme, called preemptive prioritized just enough time (PPJET). PP JET provides better service for high priority traffic by dropping reservations belonging to lower priority traffic using a new channel scheduling algorithm called preemptive latest Abstract in available unused channel with void filling (PLAUC-VF). Simulation results show that PPJET outperforms offset-based QoS schemes both in terms of dropping probability and end-to-end delay. As a second approach for solving the QoS problem in OBS networks, we present a detailed architecture for providing quantitative QoS guarantees with respect to endto-end delay, throughput, and packet loss probability in labeled OBS networks. The architecture describes a novel approach for applying fair scheduling algorithms in both the data plane of labeled OBS edge nodes and the control plane of core nodes without the need for optical buffering. In addition, we present analytical results for delay, throughput, and blocking probability in the proposed architecture. Simulation results demonstrate that the proposed architecture provides accurate and controllable service differentiation in labeled OBS networks. The absence of optical buffers in OBS nodes, coupled with the one way nature of OBS signaling protocols, drives the blocking probability to become the main performance measure in OBS networks. This give rise to the need for analytical models for calculating the blocking probability in OBS networks. In this thesis we present an approximate analytical model for calculating the blocking probability in OBS networks. The proposed analytical model takes into consideration the peculiar characteristics of OBS networks. To verify its accuracy, we compared the model results with results from a discrete-event simulation model. The proposed model results are in satisfactory agreement with simulation results.
On The Control Packet Structure of Optical Burst Switching Networks
Optical Burst Switching (OBS) is a prospective optical switching technology that can be deployed as the infrastructure of the future All-optical Internet. OBS is still at its definition phase. Hence, no definite OBS standard architecture has been established yet, including the control packet format. In this paper, a control packet structure is introduced. The structure provides constant transmission overhead and makes the control packet scalable to higher speeds. Without adjustments, the new control packet can be used with various OBS implementations. Furthermore, a simple analytical model is used to evaluate the performance of the OBS network, based on the new format of the control packet.
Performance Analysis of Continuous Wavelength Optical Burst Switching Networks
International Journal of …, 2010
Considering the economic and technical aspects of wavelength converters, full wavelength conversion capability will not be available throughout optical networks in the foreseeable future. In this paper we have used balanced static wavelength assignment (BSWA) algorithm. It is a technique to improve the performance of an all-optical network in respect of blocking probability & other parameters to provide cost effective optical communication system. We carried out the performance analysis of wavelength-continuous optical burst switching network-using BSWA for the network topologies namely NSFNET and INTERNET2NET with the initial assumption that there is no wavelength converter or optical buffer in the networks. For simulation we have used a powerful tool MatplanWDM. The performance analysis of burst loss probability v/s traffic load using BSWA algorithm shows that its performance is better than other static wavelength assignment algorithm. We have also explored the performances of NSFNET and INTERNET2NET networks on the basis of channel utilization, message delay, and the ratio of traffic transferred in single hop to total traffic offered against percentage of reused wavelength in the network. It has been observed that channel utilization becomes the maximum for 40% of reused wavelengths per fiber and beyond that cost of network unnecessary increases. By the performance analysis of message propagation delay for both network Topology, it is observed that message propagation delay, is minimum at 40% of reused wavelength per fiber and it becomes constant beyond that. It is therefore recommended that reused wavelengths per fiber should not exceed 40 % of the total available wavelength so as to yield cost effective solution with optimum performance.
Analytical framework for end-to-end design of optical burst-switched networks
Optical Switching and Networking, 2007
This paper presents an analytical model of TCP throughput in optical burst-switched (OBS) networks. Several parameters characterize this system and influence the network design process, such as the assembly time, the access bandwidth, the burst loss rate, and they are taken into account in the formulation of TCP send rates. Moreover burst loss is considered a consequence of contention in core nodes and it is formulated in relation to a quite general core node architecture. The novelty of the work is represented by the possibility of analytically representing the whole end-to-end connection so that a fast and effective tool to evaluate the relationships between network and access design is provided. An application example is given to prove the practical significance of the approach. Simulation results are provided to validate the model and the related assumptions.
Performance Evaluation of Optical Burst Switched Networks: A simulation approach
2012
This book focuses on the performance evaluation of the Optical Burst Switched (OBS) networks. A simulation framework based on OPNET Modeler is designed and implemented to evaluate the performance of an OBS network in the presence of self-similar traffic sources. The impact of self-similar traffic sources and specific design parameters imposed on the network is assessed in terms of burst assembly delay, its jitter and burst loss ratio. The performance metrics have a strong dependency on parameters such as number ...
Performance analyses of optical burst-switching networks
IEEE Journal on Selected Areas in Communications, 2003
This paper provides a scalable framework for analysis and performance evaluation of optical burst-switching (OBS) networks. In particular, a new reduced load fixed point approximation model to evaluate blocking probabilities in OBS networks is introduced. The model is versatile enough to cover known OBS reservation policies such as just-enough-time, just-in-time, burst segmentation, and route-dependent priorities. The accuracy of the model is confirmed by simulation and the various policies are compared.
A Simplified Performance Analysis of Optical Burst-Switched Networks
Journal of Lightwave Technology, 2000
A simplified mathematical model for evaluating the performance of optical burst switching networks is proposed. This model is described using a detailed state diagram. Two performance measures, namely, steady-state system throughput and average blocking probability, are derived based on the equilibrium point analysis technique. The effects of several design parameters on the above performance measures have been examined with the aid of a set of numerical examples. Index Terms-Bursty traffic, equilibrium point analysis (EPA), just-in-time (JIT) protocol, optical burst switching (OBS), optical networks, wavelength conversion. Hossam M. H. Shalaby (S'83-M'91-SM'
Cornell University - arXiv, 2010
This paper presents a new analytical model for calculating burst loss rate (BLR) in a slotted optical burst switched network. The analytical result leads to a framework which provides guidelines for optical burst switched networks. Wavelength converter is used for burst contention resolution. The effect of several design parameters such as burst arrival probability, wavelength conversion capability, number of slots per burst and number of wavelengths is incorporated on the above performance measure. We also extend the analytical result of BLR for different types of service classes where each service class has a reserved number of wavelengths in a network with fixed number of wavelengths. We also introduce an algorithm to calculate the resultant number of wavelength for each service classes depending on the various scenarios.