4 General

3GPP51.026Base Station System (BSS) equipment specificationPart 4: RepeatersRelease 17TS

Tools: ARFCN - Frequency Conversion for 5G NR/LTE/UMTS/GSM

A repeater can be designed to amplify the whole transmit RF band or just a part of the band. In the latter case the repeater can be either Broadband, with frequency band selective filtering, or channelized, with channel selective filtering.

4.1 Radio frequency bands

A repeater, as having a bi-directional amplifier capability, can amplify and transmit a received MS signal in the MS transmit band, simultaneously it can amplify and transmit a received BTS signal in the BTS transmit band. The relevant MS and BTS transmit bands for the present document are the MS and BTS transmit bands as defined in 3GPP TS 45.005 [13], clause 2. A repeater is designed to operate in one or several pass bands within the MS and BTS transmit bands as defined in 3GPP TS 45.005 [13], clause 2. In this document, such MS and BTS relevant bands are herein referred as the repeater operating bands, as defined in clause 3.1. Repeater operating band(s) and repeater pass band(s) are part of clause 4.3 Manufacturers declarations.

Table 1: void

NOTE: In some circumstances, for instance when an operator (or more than one operator who co-ordinate the use of repeaters), is not allocated a complete band, it may be necessary to restrict the frequency range of operations of repeaters. In these circumstances, the test of "Gain outside pass band" in annex A may be used to verify the performance of the repeater.

4.2 Test environments

For each test in the present document, the environmental conditions under which the repeater is to be tested are defined.

4.2.1 Normal test environment

When a normal test environment is specified for a test, the test should be performed under any combination of conditions between the minimum and maximum limits stated in table 2.

Table 2: Limits of conditions for Normal Test Environment

Condition	Minimum	Maximum
Barometric pressure	86 kPa	106 kPa
Temperature	15ºC	30ºC
Relative Humidity	20 %	85 %
Power supply	Nominal, as declared by the manufacturer
Vibration	Negligible

The ranges of barometric pressure, temperature and humidity represent the maximum variation expected in the uncontrolled environment of a test laboratory. If it is not possible to maintain these parameters within the specified limits, the actual values shall be recorded in the test report.

NOTE: This may, for instance, be the case for measurements of radiated emissions performed on an open field test site.

4.2.2 Extreme test environment

The manufacturer shall declare one of the following:

a) the equipment class for the equipment under test, as defined in ETS 300 019‑1‑3 [3];

b) the equipment class for the equipment under test, as defined in ETS 300 019‑1‑4 [4];

c) for equipment that does not comply to an ETS 300 019‑1 [2] class, the relevant classes from IEC 721 [8] documentation for temperature, humidity and vibration shall be declared.

NOTE: Reduced functionality for conditions that fall out side of the standard operational conditions are not tested in the present document. These may be stated and tested separately.

4.2.3 Extreme temperature

When an extreme temperature test environment is specified for a test, the test shall be performed at the standard minimum and maximum operating temperatures defined by the manufacturer’s declaration for the equipment under test.

Minimum temperature:

– the test shall be performed with the environmental test equipment and methods of inducing the required environmental phenomena into the equipment, conforming to the test procedure of IEC 60068‑2‑1 [7]. The equipment shall be maintained at the stabilized condition for the duration of the test sequence.

Maximum temperature:

– the test shall be performed with the environmental test equipment and methods of inducing the required environmental phenomena into the equipment, conforming to the test procedure of IEC 60068‑2‑2 [7]. The equipment shall be maintained at the stabilized condition for the duration of the test sequence.

NOTE: It is recommended that the equipment is made fully operational prior to the equipment being taken to its lower operating temperature.

4.3 Manufacturers declarations

The manufacturer shall declare:

a) the operating band or bands of the repeater;

b) for each operating band, the pass band or bands within the operating band;

c) the maximum rated output power per channel;

d) the number of channels supported by the repeater;

e) the supported modulation methods.

4.4 Methods of measurement

The general methods of measurement and measurement uncertainty shall be according to ETSI ETR 027 [11] and ETSI ETR 028 [12] except where they conflict with the present document.