The customization of services in Fifth-generation (5G) and Beyond 5G (B5G) networks relies heavily on network slicing, which creates multiple virtual networks on a shared physical infrastructure, tailored to meet specific requirements of distinct applications, using Software Defined Networking (SDN) and Network Function Virtualization (NFV). It is imperative to ensure that network services meet the performance and reliability requirements of various applications and users, thus, service assurance is one of the critical components in network slicing. One of the key functionalities of network slicing is the ability to scale Virtualized Network Functions (VNFs) in response to changing resource demand and to meet Customer Service Level agreements (SLAs). In this paper, we introduce a proactive closed-loop algorithm for end-to-end network orchestration, designed to provide service assurance in 5G and B5G networks. We focus on dynamically scaling resources to meet key performance indicators (KPIs) specific to each network slice and operate in parallel across multiple slices, making it scalable and capable of managing completely automatically real-time service assurance. Through our experiments, we demonstrate that the proposed algorithm effectively fulfills service assurance requirements for different network slice types, thereby minimizing network resource utilization and reducing the over-provisioning of spare resources.

翻译：第五代（5G）及超5代（B5G）网络中的服务定制高度依赖于网络切片技术。该技术基于软件定义网络（SDN）与网络功能虚拟化（NFV），在共享物理基础设施上创建多个虚拟网络，以满足不同应用场景的特定需求。确保网络服务满足各类应用与用户的性能及可靠性要求至关重要，因此服务保障成为网络切片中的关键组成部分。网络切片的核心功能之一，是能够根据动态变化的资源需求对虚拟化网络功能（VNF）进行扩缩容，以实现客户服务等级协议（SLA）的承诺。本文提出一种面向端到端网络编排的主动式闭环算法，旨在为5G与B5G网络提供服务保障。该算法聚焦于动态调整资源以满足各网络切片特有的关键性能指标（KPI），并支持跨多切片并行运行，从而具备可扩展性及全自动实时服务保障能力。实验结果表明，所提算法能有效满足不同网络切片类型的服务保障需求，进而实现网络资源利用率的最大化与备用资源的过度配置最小化。