3 Definitions and abbreviations

37.4663GPPIuant interface: Application partRelease 16TS

3.1 Definitions

For the purposes of the present document, the following terms and definitions apply.

Active alarm: An alarm which has an alarm state that has been raised, but not cleared

Alarm: Persistent indication of a fault

Alarm code: A code that identifies a specific alarm. The alarm code set is a subset of the return code set. The alarm codes are listed in annex A of this TS

Alarm state: A condition or state in the existence of an alarm. Alarm states are raised and cleared

ASCII character: A character forming part of the International Reference Version of the 7-bit character set defined in ISO/IEC 646:1991

Calibrate: Exercise the antenna drive unit over its entire range of travel to ensure fault-free operation and synchronise the measured and actual beam tilt of the antenna

Configuration data: A stored table or function defining the relationship between the physical position of the drive and electrical beam tilt

Data type: A definition determining the value range and interpretation of a series of octets. The following specified data types are used in this TS:




1 octet unsigned enumerated code

All AlarmCode values are listed in annex A of this TS


1 octet unsigned enumerated code

All field number values are listed in annex B of this TS


1 octet unsigned enumerated code


1 octet unsigned enumerated code

All ReturnCode values are listed in annex A of this TS


Octets with integer values in the range of 32 to 126 to be interpreted as ASCII characters

Elementary procedure: The RETAP and TMAAP protocol consists of elementary procedures (EPs). An elementary procedure is a unit of interaction between the primary device (RAN Node) and the secondary devices (RET or TMAs devices)

An EP consists of an initiating message and possibly a response message.

Two kinds of EPs are used:

Class 1: Elementary procedures with response (success or failure).

Class 2: Elementary procedures without response.

For Class 1 EPs, the types of responses can be as follows:


– A signalling message explicitly indicates that the elementary procedure has been successfully completed with the receipt of the response.


– A signalling message explicitly indicates that the EP failed.

Class 2 EPs are considered always successful.

Error: Deviation of a system from normal operation

Fault: Lasting error condition

Little endian: The order of transmission in which the least-significant octets of a multi-octet representation of a number are transmitted first. Little endian only applies to binary integer representations

MaxDataReceiveLength: SecondaryPayloadReceiveLength minus 3 octets (see subclause 4.8.1 in TS 37.462 [3])

MaxDataTransmitLength: SecondaryPayloadTransmitLength minus 3 octets (see subclause 4.8.1 in TS 37.462 [3])

Procedure code: A code identifying an elementary procedure

Reset: A process by which the device is put in the state it reaches after a completed power-up

Return code: A code which defines information about the outcome of an elementary procedure execution

Tilt (also downtilt, tilt angle, beamtilt): The elevation angle between the direction orthogonal to the antenna element axis and the maximum of its main beam in the elevation plane. A positive electrical tilt angle means that the antenna beam is directed below the direction orthogonal to the antenna axis. An antenna has separate values for electrical and mechanical tilt. The mechanical tilt is fixed by the geometry of the installation. In this TS the tilt referred to is always the electrical tilt unless otherwise stated

Tilt value: A signed integer used in elementary procedures to define the electrical tilt setting of the antenna. The tilt value is 10 times the antenna electrical tilt angle in degrees.

TMA: A TMA comprises a low noise amplifier together with its control and monitoring electronics and optional antenna modem.

TMA subunit: A TMA may comprise more than one TMA subunit. All TMA subunits within one TMA have the same HDLC address and are addressable by an index via the application layer procedures.

3.2 Abbreviations

For the purposes of the present document, the following abbreviations apply:

EP Elementary Procedure

HDLC High-Level Data Link Control

RET Remote Electrical Tilting

TMA Tower Mounted Amplifier

RETAP Remote Electrical Tilting Application Part

TMAAP Tower Mounted Amplifier Application Part

TCP Time-Consuming Procedure