Network Slice Management

Description

Network Slice Management (NSM) is a comprehensive framework defined within the 3GPP Management and Orchestration (MANO) architecture, specifically detailed in TS 28.202 and TS 28.843. It encompasses the set of management functions and interfaces required to manage the lifecycle of a network slice. A network slice is an end-to-end logical network that provides specific network capabilities and characteristics, and NSM is responsible for its instantiation, configuration, activation, supervision, and decommissioning.

The NSM framework operates through a set of management services that interact with other management functions, such as the Communication Service Management Function (CSMF) and the Network Slice Management Function (NSMF). The NSM receives slice requirements from the CSMF, which translates business needs into technical specifications. It then decomposes these requirements into sub-network slice instance requirements and coordinates with Domain Management Functions (like the Network Slice Subnet Management Function - NSSMF) to manage the resources across different network domains (e.g., RAN, Core, Transport).

Key architectural components within NSM include the management interfaces (e.g., the Nsmf interface) and the defined management procedures for slice template management, slice instance management, and slice performance assurance. It handles the provisioning of the necessary virtualized network functions (VNFs) and physical network functions (PNFs), their connectivity, and the associated policies. NSM is crucial for ensuring that each slice operates in isolation according to its defined SLA, covering aspects like performance monitoring, fault management, and security policy enforcement. It acts as the central orchestration layer for slices, enabling automated and efficient operations.

Purpose & Motivation

NSM was introduced to address the operational complexity of deploying and managing multiple, isolated logical networks (slices) over a shared physical infrastructure. Prior to network slicing, operators managed a single, monolithic network offering a one-size-fits-all service. The advent of 5G and diverse use cases (eMBB, URLLC, mMTC) demanded the ability to create tailored networks with specific performance guarantees, which was not feasible with legacy management systems.

The creation of NSM was motivated by the need for a standardized, automated management framework. Without it, slice lifecycle operations would be manual, slow, and prone to error, negating the agility benefits of network slicing. NSM solves the problem of coordinating resources across multiple technological domains (RAN, Core, Transport) that are often managed by separate systems. It provides the necessary abstraction and automation to translate high-level service requests into detailed, cross-domain resource configurations, enabling efficient use of infrastructure and rapid service delivery.