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SLA-aware differentiated QoS in elastic optical networks

机译：弹性光网络中支持SLA的差异化QoS

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The quality of service (QoS) offered by optical networks can be improved by accurate provisioning of service 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 differentiated 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 networks 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 division 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 proposed 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 functional 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 single 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 environment. The proposed SADQ is then compared with two existing benchmark routing and spectrum allocation (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 comparative 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. (C) 2017 Elsevier Inc. All rights reserved.
机译：可以通过准确提供服务级别协议（SLA）中包含的服务级别规范（SLS）来提高光网络提供的服务质量（QoS）。网络中共存的大量用户需要不同的服务。因此，务实的网络需要根据以不同成本签约不同服务的SLA，向各种用户提供差异化​​的QoS。在常规的波分复用（WDM）光网络中，由于其固定的网格结构，仅对有限数量的用户才可以进行服务区分。与WDM网络相比，新引入的基于弹性网格的弹性光网络（EON）更加适应流量需求，因为它们的网格结构具有灵活性。因此，对于由光学正交频分复用（O-OFDM）赋予的这些柔性网格EON，我们提出了一种具有改进QoS的高效SLA配给算法。所提出的算法称为SLA感知的差分QoS（SADQ），它在路由，频谱分配和连接生存能力方面采用了差分。提议的SADQ旨在使用这种多级差分来准确地提供SLA，以从网络运营商的角度提高频谱利用率。在各种流量需求模式下，针对三种不同的CoS评估了SADQ，并且对属于三种考虑的CoS的请求数量的不同比率进行了评估。我们提出了两个新的SLA指标来改善功能QoS要求，即安全性，机密性和高级服务（CoS）流量的生存能力。由于据我们所知，提出的SADQ是光网络中第一个在单个算法中在路由，频谱分配和可生存性级别上采用穷举区分的方案，因此我们首先比较一下EON和当前的SADQ性能部署WDM网络以评估这种差异化服务环境下EON和WDM网络的差异化能力。然后将提议的SADQ与同样在EONs下设计的两个现有基准路由和频谱分配（RSA）方案进行比较。仿真表明，在差异化QoS场景下，EON的SADQ性能明显优于WDM网络。对所提议的SADQ与在EON下设计的基准RSA策略进行的比较分析表明，在EON范式下，SADQ的性能有所提高，可以按照SLA提供差异化​​服务。 （C）2017 Elsevier Inc.保留所有权利。

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