Network Slicing appears as one of the enabling technologies for 5G networks to accommodate services with different requirements and availability. The present work seizes the use of network slicing and focuses on the deployment and maintenance of services which are sensitive to latency constraints. For this purpose, the design and use of a VNF latency sensor are presented, considering its aggregation to the internal chain of services and the retrieval of latency data from the sensor. In this way, and by making use of such data, the expected service performance can be guaranteed. A multi-level orchestration and control architecture is then introduced to provide all the required functionalities for this mechanism. In order to assess this method experimentally, an emulated multi-segment testbed, considering specific 5G network segments (i.e., Access, Metro and Core), is used. The experimental results demonstrate the correct latency sensing of a particular slice and the process of service maintenance through the triggering of proper network actuations such as path reconfiguration or slice reallocation.

网络切片似乎是5G网络的使能技术之一，以适应具有不同要求和可用性的服务。本工作抓住了网络切片的使用，并着重于对延迟约束敏感的服务的部署和维护。为此，介绍了VNF延迟传感器的设计和使用，同时考虑了VNF延迟传感器到服务内部链的聚合以及从传感器中检索延迟数据的情况。这样，通过利用这些数据，可以保证预期的服务性能。然后引入了多层编排和控制体系结构，以提供该机制的所有必需功能。为了实验性地评估此方法，我们考虑了特定的5G网络段（例如，Access，使用Metro和Core）。实验结果证明了通过触发适当的网络驱动（例如路径重新配置或切片重新分配）触发特定切片的正确等待时间感测和服务维护过程。