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Adaptive service function selection for Network Function Virtualization networking

机译：网络功能虚拟化网络的自适应服务功能选择

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In multiple Service Nodes (SNs) in a Network Function Virtualization (NFV) environment, numerous network functions are carried out. This study concerns the selection of Service Function Instances (SFIs) that are integrated into a Service Function Path (SFP) in resource-constrained networks with various functional requirements. Imbalanced loads in the network system are prevented and a service chain with a high Service Level Agreement (SLA) is developed. An NFV-based Service Function Chain (SFC) integration architecture is designed and an SFP selection mechanism is developed to provide a flexible service chain that satisfies service requests. Two cases are discussed to analyze the effectiveness of the mechanism. The proposed SFP selection mechanism improves the resource utilization of SFIs, prevents the overloading of SFIs, increases the number of service chains that can be serviced by the system, and reduces the packet loss rate. The proposed selection mechanism is compared with without selection mechanism to verify its performance. In case 1, only the load of the SFIs is considered. An SFC controller with the proposed SFP selection mechanism improves resource utilization by 21.32% and reduces the standard deviation of instantaneous loads by 30.02%. In case 2, the acceptable price of instances of service function is considered. The case 2 improves resource utilization by 10.31%, and the standard deviation of the instantaneous load is reduced by 18.73%. An analysis of the rejection rate indicates that the proposed mechanism improves the number of service chains that can be serviced by the system and reduces the mean packet loss rate by 1.91%. (C) 2018 Elsevier B.V. All rights reserved.
机译：在网络功能虚拟化（NFV）环境中的多个服务节点（SN）中，执行了许多网络功能。这项研究涉及在具有各种功能要求的资源受限网络中，将服务功能实例（SFI）集成到服务功能路径（SFP）中的选择。防止了网络系统中的负载不平衡，并开发了具有高服务水平协议（SLA）的服务链。设计了基于NFV的服务功能链（SFC）集成体系结构，并开发了SFP选择机制以提供满足服务请求的灵活服务链。讨论了两种情况以分析该机制的有效性。提出的SFP选择机制提高了SFI的资源利用率，防止了SFI的过载，增加了系统可以服务的服务链数量，降低了丢包率。将所提出的选择机制与没有选择机制进行比较，以验证其性能。在情况1中，仅考虑SFI的负载。具有建议的SFP选择机制的SFC控制器可将资源利用率提高21.32％，并将瞬时负载的标准偏差降低30.02％。在情况2中，考虑了服务功能实例的可接受价格。情况2将资源利用率提高了10.31％，瞬时负载的标准偏差降低了18.73％。对拒绝率的分析表明，该机制改善了系统可以服务的服务链数量，并使平均数据包丢失率降低了1.91％。 （C）2018 Elsevier B.V.保留所有权利。

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