Waveband protection mechanisms in hierarchical optical networks

Varsou, A.C.; Ganguly, Samrat; Izmailov, Rauf

doi:10.1109/hpsr.2003.1226725

Cited by 16 publications

(6 citation statements)

References 6 publications

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“…Table 1 summarizes the related work by comparing the studies based on various issues considered in the design and planning problem. From the table and to the best of our knowledge, the following issues have not been mentioned or addressed in the literature: (1) considering the whole traffic hierarchy defined in GMPLS, (2) performing color conversions of the optical signal at all granularity levels, and (3) imposing a constraint on the length of the all-optical path in order to cope with the opticalreach limitation. Optical reach is the distance an optical signal can travel without the need for regeneration [25].…”

Section: Introductionmentioning

confidence: 98%

“…Although a significant amount of open research for developing both MG-OXC architectures and approaches for the design and planning of multi-granular optical transport networks has been carried out in [1][2][3]7,8,11,14,[18][19][20][21][22][23][24], many unexplored issues still need to be addressed and investigated. Table 1 summarizes the related work by comparing the studies based on various issues considered in the design and planning problem.…”

Section: Introductionmentioning

confidence: 99%

“…Optical networking using Wavelength Division Multiplexing (WDM) has become a key technology for accommodating these rapidly expanding demands [1]. With advances in the WDM technology, WDM networks using wavelength routing by Optical Crossconnets (OXCs) have been widely recognized as the most feasible architectural solutions for transport networks [2,3].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Towards the realistic planning of GMPLS-based optical transport networks

Naas

Mouftah

2010

Photon Netw Commun

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The multi-granular switching concept defined in Generalized Multiprotocol Label Switching (GMPLS) is expected to be a future-proof solution for mitigating the Optical Crossconnet scalability problems associated with the skyrocketing growth of traffic in optical transport networks. In this paper, we address the problem of planning the GMPLSbased (or multi-granular) transport network with color (or label) conversion and signal regeneration capabilities. The objective of the problem is to minimize the total weighted port count in the transport network. The novelty of this problem lies in the incorporation of the following for the first time: (1) considering all traffic granularities defined in GMPLS; (2) allowing wavelength, waveband, and fiber conversions; (3) considering the optical-reach limitation of optical signals; and (4) customizing the optical reach of alloptical paths. Due to the computational complexity of the problem, we propose various efficient heuristics that are capable of solving large-sized problems in a reasonable amount of time. In order to achieve the best possible solution to the planning problem, a comprehensive evaluation of different heuristic variations through illustrative examples and simulations is conducted. The results also provide valuable insights into many issues that can contribute to further research and development in this area.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Towards the realistic planning of GMPLS-based optical transport networks

Naas

Mouftah

2010

Photon Netw Commun

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“…With the worldwide fiber deployment and advancing dense WDM technologies, one of the major challenges faced by T-OXCs is the dramatic increase of the node size, cost and control complexity. To address such issues, waveband switching (WBS) in conjunction with multi-granular optical cross-connects (MG-OXCs) is introduced [2]- [12]. One fundamental problem in WBS networks is the routing and wavelength/waveband assignment (RWA), which refers to the process of assigning wavelengths and routing wavelengths through intermediate nodes to satisfy the traffic demands.…”

Section: Introductionmentioning

confidence: 99%

Wavelength Retuning in Optical Waveband Switching Networks

Wang

Cao

2011

2011 Proceedings of 20th International Conference on Computer Communications and Networks (ICCCN)

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To address the challenge of the node-size (i.e., number of ports in the switching fabric) increase faced by the wavelength routed networks (WRNs), waveband switching (WBS) is introduced to group multiple wavelengths together as a band or fiber and switch them using a single port whenever possible. In WBS networks with dynamic traffic, one important goal is to minimize the traffic blocking probability, which can be caused by two factors: shortage of wavelengths and limited number of switching ports. In this work, for the first time, we study wavelength retuning in WBS networks, which was used in WRNs to reduce the traffic blocking caused by the wavelength shortage. We analyze the unique features of wavelength retuning in WBS networks as well as the various cases of port consumption due to wavelength retuning. Two strategies, namely, Inter-band retuning and Intra-band retuning are introduced to reduce the blocking caused by both the wavelength continuity constraint and the port shortage. We also propose a new wavelength retuning scheme, namely port-aware wavelength retuning (PAWR), which seeks a compromise between these two strategies and takes the advantage of both. Our simulations show that the proposed schemes can effectively reduce the blocking probability in WBS networks by as much as 20%.

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“…However, survivable WBS (SWBS) is a relatively unexplored topic, only gaining attention recently. The only related studies are [3] and [4], which address the problem without considering the routing problem or the shared risk link group (SRLG) constraint. To the best of our knowledge, the study of the SWBS problem including the routing problem and the SRLG constraint has never been carried out before.…”

Section: Introductionmentioning

confidence: 99%

Survivable waveband switching in WDM mesh networks under dedicated path-protection

Ramamurthy

2005

GLOBECOM '05. IEEE Global Telecommunications Conference, 2005.

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Abstract-This paper considers the problem of dedicated path-protection in wavelength-division multiplexed (WDM) mesh networks with waveband switching functionality under shared risk link group (SRLG) constraints. Two dedicated pathprotection schemes are proposed, namely the PBABL scheme and the MPABWL scheme. The PBABL scheme protects each working waveband-path through a backup waveband-path. The MPABWL scheme protects each working waveband-path by either a backup waveband-path or multiple backup lightpaths. Heuristic algorithms adopting random optimization technique are proposed for both the schemes. The performance of the two protection schemes is studied and compared. Simulation results show that both the heuristics can obtain optimum solutions and the MPABWL scheme leads to less switching and transmission costs than the PBABL scheme.

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Waveband protection mechanisms in hierarchical optical networks

Cited by 16 publications

References 6 publications

Towards the realistic planning of GMPLS-based optical transport networks

Towards the realistic planning of GMPLS-based optical transport networks

Wavelength Retuning in Optical Waveband Switching Networks

Survivable waveband switching in WDM mesh networks under dedicated path-protection

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