Nomadic Operating Mode

Description

Nomadic Operating Mode is a term defined in 3GPP TS 21.905 (Vocabulary for 3GPP Specifications) and TS 22.105 (Services and Service Capabilities) that describes a specific mode of operation for a terminal. In this mode, the terminal is transportable, meaning it can be moved between locations, but it is operated while stationary. Additionally, it may require user cooperation, such as being placed close to open spaces or having an antenna set up. This distinguishes it from fully mobile operation, where the terminal is used while in motion, and from fixed operation, where the terminal is permanently installed at a single location.

The concept of Nomadic Operating Mode is important for defining the service requirements and capabilities of terminals in 3GPP networks. It is part of a taxonomy of operating modes that includes mobile, nomadic, and fixed operation. These modes help characterize the expected usage scenarios and the corresponding requirements for the terminal, the radio access network, and the core network. For example, a nomadic terminal may have different requirements for handover, power control, and antenna configuration compared to a fully mobile terminal.

In practical terms, a nomadic terminal could be a laptop with a cellular modem that is used in different locations but always while the user is stationary, such as in a coffee shop, hotel room, or office. Another example is a satellite terminal that is transported to a location and set up with a directional antenna pointed at the satellite. The user cooperation aspect is significant because it implies that the terminal may not be self-contained or fully automatic in its operation, requiring the user to perform certain actions to establish or maintain connectivity.

The Nomadic Operating Mode is relevant to various 3GPP services, including satellite communications, fixed wireless access, and portable broadband applications. In satellite systems, for instance, a nomadic terminal might be a VSAT (Very Small Aperture Terminal) that is transported to a remote location and set up for temporary connectivity. The 3GPP specifications for satellite access in 5G (NTN, Non-Terrestrial Networks) also consider nomadic terminals as a use case, where the terminal is stationary during operation but can be relocated.

From a regulatory and standardization perspective, the definition of Nomadic Operating Mode helps ensure that terminals and networks are designed with appropriate capabilities for different usage scenarios. It influences aspects such as antenna design, power class, mobility management, and service continuity. The term has been stable in 3GPP specifications since Release 4, reflecting its foundational nature in characterizing terminal operation.

Purpose & Motivation

Nomadic Operating Mode was defined to provide a clear classification of terminal usage scenarios that fall between fully mobile and fixed operation. This classification is necessary for specifying terminal requirements, network capabilities, and service expectations. Without such a definition, it would be difficult to distinguish between terminals that are used while moving and those that are moved but used while stationary, leading to overly conservative or inadequate design requirements.

The term addresses the need for a common vocabulary in 3GPP specifications to describe terminals that are transportable but not used in motion. This is particularly relevant for satellite communications, where terminals may be transported to a location and set up with a directional antenna, and for portable broadband applications. By defining this mode, 3GPP enables the development of appropriate technical solutions and ensures interoperability across different terminal types and network deployments.