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wavelength assignment algorithms in OBS networks

OPTIK 2012年第20期123卷 1823-1825页

作者： Singh, Hardeep Prakash, Jai Arora, Dinesh Wason, Amit Indo Global Coll Engn Dept Appl Phys Mohali 140109 Punjab India Singhania Univ Jhunjhunu 333515 Rajasthan India Swami Devi Dyal Inst Engn & Technol Elect & Commun Engn Dept Barwala 134009 Haryana India Hindustan Inst Technol & Management Elect & Commun Engn Dept Ambala 133202 Haryana India

The wavelength assignment algorithm is a method to improve the performance in respect of blocking probability and to provide cost effective communication system. In this paper, we have developed a simple mathematical model which is used for the calculation of blocking probability of an OBS network. The implementation of the proposed model has less complexity and the computation used is quite efficient. This model can be implemented on different network topologies. The validity of model is supported by simulation results. (c) 2012 Elsevier GmbH. All rights reserved.

关键词： Optical burst switching wavelength assignment algorithms Blocking probability

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A Markov-based reservation algorithm for wavelength assignment in all-optical networks

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JOURNAL OF LIGHTWAVE TECHNOLOGY 2007年第7期25卷 1676-1683页

作者： Lin, Wenhao Wolff, Richard S. Mumey, Brendan ZTE Inc Shenzhen 518057 Peoples R China Montana State Univ Dept Elect & Comp Engn Bozeman MT 59717 USA Telcordia Technologies Piscataway NJ 08807 USA Montana State Univ Dept Elect & Comp Engn Bozeman MT 59717 USA Montana State Univ Dept Comp Sci Bozeman MT 59717 USA

Most routing and wavelength assignment algorithms for all-optical networks do not consider the potential problem of reservation confliction, which occurs when two or more reservation requests compete for the same wavelength. Confliction can happen even if the network is only lightly loaded. In this paper, we propose a new reservation protocol Markov-based Backward Reservation (MBR) based on Markov modeling of the network traffic on optical links for resolving wavelength reservation confliction. Our simulations show that this new protocol can improve network performance as measured by decreased blocking probability. The MBR algorithm works best in small-hop-count networks with a comparatively small number of wavelengths per fiber compared to other frequently considered algorithms.

关键词： all-optical networks backward reservation protocol continuous-time Markov chain (C-T Markov chain) routing and wavelength assignment (RWA) routing algorithms transient analysis of Markov chains wavelength assignment algorithms

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wavelength assignment for Physical-Layer-Impaired Optical Networks Using Evolutionary Computation

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JOURNAL OF OPTICAL COMMUNICATIONS AND NETWORKING 2011年第3期3卷 178-188页

作者： Bastos-Filho, Carmelo J. A. Chaves, Daniel A. R. Silva, Felipe S. F. e Pereira, Helder A. Martins-Filho, Joaquim F. Univ Fed Pernambuco Polytech Sch Pernambuco BR-52720001 Recife PE Brazil Univ Fed Pernambuco Dept Elect Syst BR-50740530 Recife PE Brazil

This paper presents a wavelength assignment algorithm suitable for optical networks mainly impaired by physical layer effects, named the Intelligent wavelength assignment algorithm (iWA). The main idea is to determine the wavelength activation order for a first-fit algorithm that balances the impact of the physical layer effects by using a training algorithm inspired by evolutionary concepts. The iWA presents some recently proposed concepts in intelligent optimization algorithms, such as an external archive to store the best solutions. Some different physical layer effects, such as four-wave mixing and residual dispersion, were considered in the tests of our proposal. We tested our proposal for transparent optical networks. However, we believe iWA can be used in other types of network, such as opaque networks and translucent networks. The proposed wavelength assignment algorithm was compared with five other wavelength assignment algorithms for two network topologies in three different scenarios. The iWA algorithm outperformed the other WA algorithms in most cases. The robustness of our proposed algorithm to the load distribution changes was also analyzed.

关键词： Evolutionary computation IA-RWA IA-WA Optical networks Physical impairments RWA wavelength assignment algorithms

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Routing and wavelength assignment in GMPLS-based DWDM optical networks

Routing and wavelength assignment in GMPLS-based DWDM optica...

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2nd Annual Conference on Optical Transmission Systems and Equipment for WDM Networking

作者： Binh, LN Hoang, NM Wu, Z Cieutat, C Sekergioglu, A Monash Univ Dept Elect & Comp Syst Engn Clayton Vic 3168 Australia

ISBN: (纸本)0819451304

Given a set of lightpath connection requests in an all-optical wavelength division multiplexed (DWDM) network, lightpaths are designed and the wavelength channels are assigned so that the scheme minimizes on average the blocking of existing and provisional requests. This paper proposes a routing and wavelength assignment scheme for DWDM long-haul optical networks that includes routing, assignment and reservation of different wavelength channels operating under the G-MPLS environment. The modeling is implemented under the framework of an object-oriented modeling platform OMNeT++. Network performance tests are evaluated for a long-haul terrestrial fiber network composed of 12 gigaPoPs with an average degree of 3. Traffic blocking of lightpath requests are examined with the average link utilization in the network employing variable number of wavelength channels. Two principal algorithm for wavelength assignments, the first-fit and random types, are studied and proven that the random scheme offers significant better performance than that of its counterpart.

关键词： DWDM optical networks optical transmission systems wavelength routers Generalized Multi-protocol Label Switching wavelength assignment algorithms

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wavelength requirements and routing for multicast connections in lightpath and light-tree models of WDM networks with limited drops

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IEE PROCEEDINGS-COMMUNICATIONS 2001年第6期148卷 363-367页

作者： Gao, S Jia, X Hu, X Li, D City Univ Hong Kong Dept Comp Sci Hong Kong Hong Kong Peoples R China

The wavelength requirements of a multicast connection in WDM networks are studied. The network model is an all-optical network, in which a message can be dropped (or split) only at a limited number of destination nodes along a lightpath or a fight-tree, due to the power loss of dropping optical signals. The upper and lower bounds of wavelength requirements for establishing a multicast connection in various topologies of networks are presented. The optimal routing and wavelength assignment algorithms for multicast connections to achieve the minimal number of wavelengths are also described.

关键词： limited drops wavelength requirements wavelength assignment algorithms Combinatorial mathematics optical fibre network network topology trees (mathematics) multicast communication destination nodes lower bounds Multiplexing and switching in optical communication all-optical network optimal routing algorithms lightpath models upper bounds Communication network design, planning and routing Optical fibre networks wavelength division multiplexing telecommunication network routing multicast connections light-tree models optical fibre networks WDM networks

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Towards programmable on-demand lightpath services: current state-of-the-art and open research areas

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IET NETWORKS 2019年第6期8卷 347-355页

作者： Nkosi, Mpho C. Mamushiane, Lusani Lysko, Albert A. Johnson, David L. Engelbrecht, Andries P. CSIR Meraka Inst Meiring Naude Rd ZA-0001 Pretoria South Africa Stellenbosch Univ Dept Ind Engn Comp Sci Div ZA-7600 Stellenbosch South Africa

With emerging programmable network architectures gaining momentum in the networking industry, it is necessary to look at how the services currently offered on traditional network architectures can be fully migrated to the programmable networks. In traditional networks, lightpaths are used for providing high-bandwidth consuming services that are usually sensitive to delay. Lightpath scheduling requires admission control mechanisms, routing and wavelength assignment algorithms, and protection and restoration mechanisms that ensure reliable and efficient lightpath routing. Software defined networking (SDN) is the emerging programmable network architecture that paves the way for easier network management and configuration by using application programming interfaces. The state-of-the-art in lightpath routing for wavelength division multiplexing networks focusing on lightpath scheduling, routing, protection and restoration in optical software defined networks is surveyed. Moreover, open research issues for SDN lightpath routing solution are discussed.

关键词： optical fibre networks telecommunication network management wavelength division multiplexing application program interfaces wavelength assignment telecommunication congestion control telecommunication network routing SDN lightpath routing solution open research issues optical software defined networks easier network management emerging programmable network architecture efficient lightpath routing reliable lightpath routing restoration mechanisms wavelength assignment algorithms admission control mechanisms lightpath scheduling high-bandwidth consuming services lightpaths programmable networks traditional network architectures networking industry programmable network architectures open research areas towards programmable on-demand lightpath services

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wavelength conversion in WDM optical networks: Strategies and algorithms for limiting the number of converters in the optical cross-connects

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PHOTONIC NETWORK COMMUNICATIONS 2000年第4期2卷 335-348页

作者： Listanti, M Sabella, R Univ Rome Dept Info Com I-00184 Rome Italy Ericsson Telecomun R&D Div I-00040 Rome Italy

This paper considers the problem of wavelength conversion in optical networks using wavelength division multiplexing technique. In the previous literature, two main wavelength routing and assignment strategies have been introduced: wavelength path (WP) and virtual wavelength path (VWP), depending on whether the signal stays on the same wavelength or is converted to another during its travel throughout the network. While the former method does not require any wavelength conversion, the latter needs wavelength conversion in each optical node and, in particular, a wavelength converter per each signal handled by the node itself. From the previous literature emerged that the VWP leads to optical cross-connect (OXC) with lower dimensions compared to the ones required by the WP scheme, and that the difference between the WP and VWP schemes increases as the number of wavelengths carried by each fiber increases. In this paper a new strategy is introduced, named partial virtual wavelength path (PVWP), with the related wavelength routing and assignment algorithm, which makes limited use of wavelength conversion compared to the VWP scheme, and allows the same advantages of VWP to be attained with lower OXC dimensions. The paper reports a comparative analysis among the different strategies, considering both the cases of a network without failures and a network with the possibility of failure restoration. The main result is that the proposed PVWP strategy allows the same advantages of the VWP scheme with a strongly reduced number of wavelength converters (around 5% of the number required by VWP scheme). This figure does not vary appreciably if failure restoration is considered. The new strategy can be adopted by using an opportune OXC architecture, as illustrated in the paper, which allow a limited number of converters to be shared among all the channels as a common pool.

关键词： optical networks WDM OXC routing policies wavelength conversion wavelength routing algorithms wavelength assignment algorithms

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