A Pattern-layered Routing and Spectrum Allocation in OFDM-based Flexible Optical Networks

Chen, Xin; Guo, Bingli; Ma, Songwei; Wang, Yan; Li, Juhao; Chen, Zhangyuan; He, Yongqi

doi:10.1364/acp.2012.as4d.5

Cited by 4 publications

(3 citation statements)

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“…Thus, the routing and spectrum assignment (RSA) problem in FBON concerns assigning a consecutive fraction of spectrum (consecutive constraints) to each optical channel subject to the constraint of employing the same spectrum segment along its routing (continuity constraints) [7][8][9][10][11][12][13]. In this case, RSA differs from the routing and wavelength assignment problem in WDM networks and has attracted a lot of attention recently.…”

Section: Introductionmentioning

confidence: 99%

“…The RSA algorithm is used both in the network planning phase (static RSA) [7][8][9] or to dynamically provision connections at arrivals of requests (dynamic RSA) [10][11][12][13][14][15][16]. Heuristics have been proposed to minimize the traffic blocking [10][11][12][13] of dynamic RSA, especially for those systems with time-varying traffic [14] or with the purpose of traffic grooming [15] or energy efficiency [16].…”

Section: Introductionmentioning

confidence: 99%

“…Heuristics have been proposed to minimize the traffic blocking [10][11][12][13] of dynamic RSA, especially for those systems with time-varying traffic [14] or with the purpose of traffic grooming [15] or energy efficiency [16]. Furthermore, some spectrum defragmentation methods have been deployed based on a wavelength conversion technique [17] or traffic rerouting [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Collision-Aware Routing and Spectrum Assignment in GMPLS-Enabled Flexible-Bandwidth Optical Network

Guo

Wang

et al. 2013

J. Opt. Commun. Netw.

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In a flexible-bandwidth optical network (FBON) with a generalized multiprotocol label switching control plane, the resource reservation protocol with traffic engineering extensions (RSVP-TE) is employed to establish end-to-end bandwidth variable lightpaths. The resource reservation can be blocked due to spectrum contention of different concurrent RSVP instances (called backward blocking), and it is the predominant blocking contribution when traffic load is low and arrival highly dynamic. Also, due to its flexible traffic granularity in FBON, the backward collision would happen more frequently and the collision scenario would be more complicated than that in wavelength-routed networking; thus the need for a collision evaluation and avoiding method. So, a collisionavoiding routing with maximum available spectrum allocation (SA) options and an SA scheme to search the spectrum segment with minimum collision possibility are proposed for backward blocking reduction, as well as an extension to the RSVP-TE. Simulation results show that the proposed algorithm could achieve better blocking performance through significantly reducing the backward reservation collision but with acceptable forward blocking deterioration. At the same time, with the proposed algorithm, different granularity traffic could be served more fairly in FBON.Index Terms-Collision aware; Flexible bandwidth optical network; Routing and spectrum assignment.

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