Conference Paper

Shared Path Protection in GMPLS networks with limited wavelength conversion capability

DTU Fotonik, Tech. Univ. of Denmark, Lyngby, Denmark
DOI: 10.1109/HPSR.2010.5580268 Conference: High Performance Switching and Routing (HPSR), 2010 International Conference on
Source: IEEE Xplore


Sharing of protection resources is a cost-effective solution to guarantee survivability against failures. In wavelength-switched optical networks (WSON), in addition to sharing the wavelengths resources, wavelength converters (WCs) can also be shared by different optical connections, or lightpaths. This paper considers the problem of ensuring 100% survivability against single-link failures in a GMPLS-enabled optical network. RSVP-TE signalling protocol extensions for wavelength sharing under Shared Path Protection have been recently proposed for networks with wavelength continuity constraint. In this work, the performance of the proposed extensions is evaluated in a network with limited wavelength conversion. Furthermore, new extensions are proposed for an efficient WC sharing and their impact on the resource sharing is evaluated by simulations. Results indicate a trade-off between providing high wavelength sharing (i.e., low wavelength overbuild) and good WC sharing.

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Available from: Piero Castoldi, Mar 19, 2014
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    • "includes an element for each wavelength contained in the Label Set. Each element indicates the number of links on which the corresponding wavelength is in shared-reserved status; • Shared Regenerator Vector (S-RV) proposed in [2] includes an element for each wavelength contained in the Label Set. Each element indicates the number of sharable regenerators that are required for establishing the LSP on the corresponding wavelengths. "
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    ABSTRACT: In Wavelength Switched Optical Networks (WSONs), sharing of protection wavelengths is an attractive strategy to increase survivability against failures. However, to guarantee an acceptable quality of transmission (QoT), both working and protection paths may need to undergo optical-electrical-optical (OEO) regeneration. With this aim, the placement of a limited number of regenerators is a cost-effective solution to guarantee QoT. In this paper, the concept of sharing the protection resources is extended to regenerators. Moreover, shared regenerators can be exploited for ensuring QoT as well as for providing wavelength conversion. The main objective of this paper is the study of different strategies for the selection of regenerators and wavelengths in WSON with a GMPLS-based distributed control plane. Simulation results show a trade-off between the strategies achieving a high wavelength sharing and those achieving a high regenerator sharing.
    Full-text · Conference Paper · Jan 2011
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    ABSTRACT: Given the potentialities in terms of high bandwidth, low costs, and low power consumption, Wavelength Switched Optical Networks (WSONs) are the most promising candidate for next generation backbone networks. In WSONs the optical signal is switched at the wavelength granularity, therefore the wavelength assignment process plays a crucial role in dynamic network operation. Generalized Multi-Protocol Label Switching (GMPLS) is the standard control plane for WSONs. However, current GMPLS protocol suite does not envision a general mechanism to rank the wavelengths. The lack of wavelength preference in WSONs may cause high blocking probability, wavelength converter waste, and detrimental effects due to physical impairments. This paper reviews several WSON scenarios where the wavelength preference concept is introduced to optimize the wavelength assignment: wavelength continuous, wavelength convertible, and quality of transmission aware WSONs. To enforce wavelength preference, an extension to the GMPLS signaling protocol is utilized. Simulation results show that wavelength preference can effectively reduce blocking probability, save wavelength converters, and guarantee lightpath quality of transmission.
    Full-text · Article · Aug 2011
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