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）及后5G（B5G）网络中的服务定制高度依赖网络切片技术，该技术通过软件定义网络（SDN）和网络功能虚拟化（NFV）在共享物理基础设施上构建多个虚拟网络，以满足不同应用的特殊需求。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，因此服务保障是网络切片的关键组成部分之一。网络切片的核心功能之一是根据资源需求变化动态扩展虚拟化网络功能（VNF），并满足客户服务水平协议（SLA）。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和B5G网络提供服务保障。该算法聚焦于按各网络切片特定的关键性能指标（KPI）动态扩展资源，并支持多切片并行运行，具备可扩展性及全自动实时服务保障管理能力。实验结果表明，所提算法能有效满足不同类型网络切片的服务保障需求，从而最小化网络资源利用率并减少备用资源的过度配置。