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عنوان انگلیسی مقاله:
SLA-aware differentiated QoS in elastic optical networks
ترجمه فارسی عنوان مقاله:
SLA-آگاهی QoS متمایز در شبکه های نوری الاستیک
Sciencedirect - Elsevier - Optical Fiber Technology, 36 (2017) 41-50. doi:10.1016/j.yofte.2017.01.012
Anuj Agrawal , Upama Vyas , Vimal Bhatia , Shashi Prakash
The quality of service (QoS) offered by optical networks can be improved by accurate provisioning of ser- vice level specifications (SLSs) included in the service level agreement (SLA). A large number of users coexisting in the network require different services. Thus, a pragmatic network needs to offer a differen- tiated QoS to a variety of users according to the SLA contracted for different services at varying costs. In conventional wavelength division multiplexed (WDM) optical networks, service differentiation is feasible only for a limited number of users because of its fixed-grid structure. Newly introduced flex-grid based elastic optical networks (EONs) are more adaptive to traffic requirements as compared to the WDM net- works because of the flexibility in their grid structure. Thus, we propose an efficient SLA provisioning algorithm with improved QoS for these flex-grid EONs empowered by optical orthogonal frequency divi- sion multiplexing (O-OFDM). The proposed algorithm, called SLA-aware differentiated QoS (SADQ), employs differentiation at the level of routing, spectrum allocation, and connection survivability. The pro- posed SADQ aims to accurately provision the SLA using such multilevel differentiation with an objective to improve the spectrum utilization from the network operator’s perspective. SADQ is evaluated for three different CoSs under various traffic demand patterns and for different ratios of the number of requests belonging to the three considered CoSs. We propose two new SLA metrics for the improvement of func- tional QoS requirements, namely, security, confidentiality and survivability of high class of service (CoS) traffic. Since, to the best of our knowledge, the proposed SADQ is the first scheme in optical networks to employ exhaustive differentiation at the levels of routing, spectrum allocation, and survivability in a sin- gle algorithm, we first compare the performance of SADQ in EON and currently deployed WDM networks to assess the differentiation capability of EON and WDM networks under such differentiated service envi- ronment. The proposed SADQ is then compared with two existing benchmark routing and spectrum allo- cation (RSA) schemes that are also designed under EONs. Simulations indicate that the performance of SADQ is distinctly better in EON than in WDM network under differentiated QoS scenario. The compar- ative analysis of the proposed SADQ with the considered benchmark RSA strategies designed under EON shows the improved performance of SADQ in EON paradigm for offering differentiated services as per the SLA.© 2017 Elsevier Inc. All rights reserved.1.
Keywords:Differentiated service | Elastic optical network | Quality of service | Security | Service level agreement | Survivability