3 Definitions and abbreviations
37.4663GPPIuant interface: Application partRelease 17TS
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:
Name: |
Definition: |
AlarmCode |
1 octet unsigned enumerated code All AlarmCode values are listed in annex A of this TS |
FieldNumber |
1 octet unsigned enumerated code All field number values are listed in annex B of this TS |
ProcedureCode |
1 octet unsigned enumerated code |
ReturnCode |
1 octet unsigned enumerated code All ReturnCode values are listed in annex A of this TS |
TextString |
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:
Successful
– A signalling message explicitly indicates that the elementary procedure has been successfully completed with the receipt of the response.
Unsuccessful
– 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