Single band TAB connector

Description

A Single band TAB connector is a specific type of TAB connector used in base station equipment, particularly in the context of active antenna systems (AAS) and multi-standard radio (MSR). The term 'TAB' stands for 'Total Accumulated Bandwidth' or more precisely, it refers to a connector that is part of the antenna element to radio unit interface. In 3GPP specifications (TS 37.105 and TS 37.145), a TAB connector is a port on a radio distribution network (RDN) that can be connected to an antenna element. The Single band TAB connector definition classifies such a connector based on its operational capability: it either supports a single operating band only, or it supports multiple bands but does not meet the conditions to be considered a multi-band Radio Interface Broadband (RIB) connector.

The architecture around TAB connectors involves the radio distribution network within an AAS base station. In an AAS, the radio unit is integrated with the antenna array, and signals are distributed to individual antenna elements via a network of connectors. A multi-band RIB is a connector that supports multiple bands simultaneously with certain performance characteristics, such as common active electronic components. A Single band TAB connector is a lower-capability variant that either operates in just one band or, if it operates in multiple bands, lacks the necessary common active components to qualify as a multi-band RIB. This distinction is important for testing and performance requirements, as different connector types have different test setups and criteria.

The key components of a Single band TAB connector include the physical connector itself, the associated radio distribution network, and the active electronic components (if any) that process the signals. The definition specifically mentions 'common active electronic component(s)' in the Rel-13 and Rel-14 versions, highlighting that the presence or absence of shared active components determines the classification. In later releases, the definition was revised to reference the conditions for a multi-band RIB, which are more precisely defined in the specifications.

In the network, Single band TAB connectors are used in base station antennas to interface between the radio unit and the antenna elements. They are relevant for conformance testing, as test procedures for AAS base stations must account for the type of connector. The classification affects how tests are performed, especially for multi-band operation, where interference and intermodulation between bands must be considered. The term is primarily used in the context of regulatory compliance and type approval of AAS base stations.

The evolution of the definition shows a change in Rel-15, where the wording shifted from 'without any common active electronic component(s)' to 'does not meet the conditions for a multi-band RIB.' This change reflects a more precise and standardized way of defining the capability, aligning with the broader definitions in the specifications. The definition has remained unchanged since Rel-15, indicating that the concept has stabilized. The term is part of the specialized terminology for AAS base station testing and is less commonly encountered in general network operations.

Purpose & Motivation

The Single band TAB connector term exists to provide a clear classification for connectors in active antenna systems (AAS) base stations, particularly for testing and performance requirements. In the early days of AAS, the industry needed a way to distinguish between connectors that could support multiple bands with shared components and those that could not. The problem was that without a clear definition, test setups and requirements could be ambiguous, leading to inconsistent certification and potential interoperability issues.

The motivation for this term came from the complexity of multi-band operation in AAS. When a connector supports multiple bands, the presence of common active electronic components can create new interference scenarios, such as intermodulation products that fall into other bands. Therefore, multi-band RIB connectors require more stringent requirements. Single band TAB connectors, which either operate in a single band or lack common active components, have different requirements. This distinction ensures that equipment is tested appropriately and that performance is guaranteed.

Historically, the term was introduced in Rel-13 as part of the first comprehensive specifications for AAS base stations (TS 37.105 and TS 37.145). The initial definition used the phrase 'without any common active electronic component(s),' which was a functional description. In Rel-15, the definition was revised to refer to the conditions for a multi-band RIB, which are more formally specified. This change improved clarity and consistency with other parts of the specifications. The term continues to be used in later releases without change, as the underlying concept remains valid.