Iu CS Link

Description

The IucsLink is a managed function defined in the 3GPP Generic Network Resource Model (NRM), specifically within the GenericNetworkResourcesNRMDefs. It represents the Iu-CS interface between a Radio Network Controller (RNC) and the Circuit Switched (CS) domain of the core network in a UMTS Terrestrial Radio Access Network (UTRAN). The Iu-CS interface carries circuit-switched traffic, such as voice calls, between the RAN and the core network. The IucsLink is a managed object that encapsulates the management aspects of the Iu-CS interface, including its transport resources, configuration parameters, and performance metrics.

In the 3GPP management architecture, the IucsLink is an instance of the ManagedFunction class, which is a generic class for representing managed functions in the network. The IucsLink provides attributes and parameters that allow the network management system to configure and monitor the Iu-CS interface, such as the transport layer address, the operational state, and the administrative state. It is typically contained within a managed element that represents the RNC.

The IucsLink is defined in 3GPP Technical Specification 28.703, which specifies the Generic Network Resource Model (NRM) for UTRAN. It is also referenced in TS 32.636, which specifies the configuration management (CM) for UTRAN. The IucsLink is used by the network management system to manage the Iu-CS interface, ensuring proper configuration and efficient operation.

The IucsLink has been part of the 3GPP specifications since Release 10. Its definition has remained unchanged across all subsequent releases up to Release 19, indicating a stable and mature specification. The IucsLink is a crucial component for managing the Iu-CS interface, enabling operators to configure and optimize the circuit-switched core network connectivity for UTRAN.

Purpose & Motivation

The IucsLink exists to provide a standardized management representation of the Iu-CS interface between an RNC and the CS domain of the core network. In UTRAN deployments, the Iu-CS interface is essential for carrying circuit-switched traffic, such as voice calls, and its management is critical for ensuring quality of service and network reliability. The IucsLink provides a managed object that represents the Iu-CS interface, allowing operators to manage all aspects of the interface from a central management system.

Before the introduction of the IucsLink, the management of the Iu-CS interface was less structured, and there was no standardized way to represent the interface in the NRM. The IucsLink addresses this by providing a clear, standardized managed object that can be configured and monitored by the network management system. This allows operators to manage the Iu-CS interface more effectively, including the ability to set QoS parameters, monitor performance, and troubleshoot issues.

The IucsLink also supports the evolution of UTRAN towards higher capacities and more efficient transport. By providing a standardized management interface, it enables multi-vendor interoperability and simplifies network operations. The IucsLink is part of the broader 3GPP management framework, which aims to provide a consistent and scalable management solution for mobile networks.