4 Test conditions

25.1133GPPBase station (BS) and repeater electromagnetic compatibility (EMC)Release 17TS

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

4.1 General

The equipment shall be tested in normal test environment defined in base station conformance testing specification TS 25.141 [3] or TS 25.142 [4] or in the UTRA Repeater conformance testing specification TS25.143 [11]. The test conditions shall be recorded in the test report.

For an EUT which contains more than one BS, it is sufficient to perform tests relating to each type of port of each representative type of the BS forming part of the EUT.

For BS capable of multi-band operation, the requirements in the present document apply for each supported operating band unless otherwise stated. Operating bands shall be activated according to the test configuration in subclause 4.6. Tests shall be performed relating to each type of port and all bands shall be assessed during the tests.

4.2 Arrangements for establishing a communication link

The wanted RF input signal nominal frequency shall be selected by setting the UTRA Absolute Radio Frequency Channel Number (UARFCN) to an appropriate number.

A communication link shall be set up with a suitable test system capable of evaluating the required performance criteria (hereafter called "the test system") at the air interface and/or the Iub interface. The test system shall be located outside of the test environment.

When the EUT is required to be in the transmit/receive mode, the following conditions shall be met:

– the EUT shall be commanded to operate at maximum rated transmit power;

– Adequate measures shall be taken to avoid the effect of the unwanted signal on the measuring equipment;

– The wanted input signal level shall be set to a level where the performance is not limited by the receiver noise floor or strong signal effects e.g.15 dB above the reference sensitivity level as defined in TS 25.141 (for FDD) 3 or TS 25.142 (for TDD) [4], to provide a stable communication link.

For immunity tests subclause 4.3 shall apply and the conditions shall be as follows:

4.2.1 Multiple enclosure BS solution

For a BS with multiple enclosures, the BS part with Radio digital unit and the Radio unit may be tested separately. Communication link shall be set up in the same way as if they are in single BS enclosure. The Radio Digital unit and the Radio unit shall communicate over an interface enabling establishment of a communication link.

4.3 Narrow band responses on receivers

4.3.1 FDD and 3,84 Mcps TDD option

Responses on receivers or duplex transceivers occurring during the immunity test at discrete frequencies which are narrow band responses (spurious responses), are identified by the following method:

– if during an immunity test the quantity being monitored goes outside the specified tolerances (clause 6), it is necessary to establish whether the deviation is due to a narrow band response or to a wide band (EMC) phenomenon. Therefore, the test shall be repeated with the unwanted signal frequency increased, and then decreased by 10 MHz;

– if the deviation disappears in either or both of the above 10 MHz offset cases, then the response is considered as a narrow band response;

– if the deviation does not disappear, this may be due to the fact that the offset has made the frequency of the unwanted signal correspond to the frequency of another narrow band response. Under these circumstances the procedure is repeated with the increase and decrease of the frequency of the unwanted signal set to 12,5 MHz;

– if the deviation does not disappear with the increased and/or decreased frequency, the phenomenon is considered wide band and therefore an EMC problem and the equipment fails the test.

Narrow band responses are disregarded.

For BS capable of multi-band operation, all supported operating bands shall be considered for narrowband responses.

4.3.2 1,28 Mcps TDD option

For 1.28Mcps chip rate TDD option, responses on receivers or duplex transceivers occurring during the test at discrete frequencies which are narrow band responses (spurious responses), are identified by the following method:

– if during an immunity test the quantity being monitored goes outside the specified tolerances, it is necessary to establish whether the deviation is due to a narrow band response or to a wide band (EMC) phenomenon. Therefore, the test shall be repeated with the unwanted signal frequency increased, and then decreased by 3.2MHz;

– if the deviation disappears in either or both of the above 3.2 MHz offset cases, then the response is considered as a narrow band response;

– if the deviation does not disappear with the increased and/or decreased frequency, the phenomenon is considered wide band and therefore an EMC problem and the equipment fails the test.

Narrow band responses are disregarded.

For BS capable of multi-band operation, all supported operating bands shall be considered for narrowband responses.

4.4 Test condition for Repeater

The wanted RF input signal nominal frequency shall be selected by setting the Absolute Radio Frequency Channel Number (ARFCN) to an appropriate number within the pass band of the Repeater.

The Repeater path shall be tested with a suitable test system capable of measuring RF performance criteria (hereafter called "the test system"). The test system shall be located outside of the test environment.

When the EUT is required to be in the operational mode, the following conditions shall be met:

– the EUT shall be commanded to operate at maximum rated gain;

– Adequate measures shall be taken to avoid the effect of the unwanted signal on the measuring equipment;

For immunity tests conditions subclause 4.3 shall apply.

4.4.1 Arrangements for test signals for repeaters

For immunity tests of repeaters, the wanted RF input signal shall be coupled to one antenna port at a level which will result, when measured, in the maximum rated RF output power per channel, as declared by the manufacturer. The test shall either be repeated with a wanted signal coupled to the other antenna port, or a single test shall be performed with the specified input signals being simultaneously coupled to both antenna ports.

4.5 Exclusion bands

4.5.1 Transmitter exclusion band

For the purpose of EMC specifications there shall be a transmitter exclusion band.

For UTRA FDD:

Lower carrier frequency used – 12,5 MHz. to upper carrier frequency used + 12,5 MHz.

For UTRA 3,84 Mcps TDD option:

Lower carrier frequency used – 12,5 MHz. to upper carrier frequency used + 12,5 MHz.

For UTRA 1,28 Mcps TDD option:

Lower carrier frequency used – 4 MHz to upper carrier frequency used + 4 MHz.

For UTRA 7,68 Mcps TDD option:

Lower carrier frequency used – 25 MHz. to upper carrier frequency used + 25 MHz.

4.5.2 Receiver exclusion band

The receiver exclusion band for base stations extends from the lower frequency of the Base Station receive band minus 20 MHz to the upper frequency of the Base Station receive band plus 20 MHz. The exclusion bands are as set out below:

UTRA FDD:

a) 1900 MHz to 2000 MHz (Band I)

b) 1830 MHz to 1930 MHz (Band II)

c) 1690 MHz to 1805 MHz (Band III)

d) 1690 MHz to 1775 MHz (Band IV)

e) 804 MHz to 869 MHz (Band V)

f) 810 MHz to 860 MHz (Band VI)

g) 2480 MHz to 2590 MHz (Band VII)

h) 860 MHz to 935 MHz (Band VIII)

i) 1729.9 MHz to 1804.9 MHz (Band IX)

j) 1690 MHz to 1790 MHz (Band X)

k) 1407.9 MHz to 1467.9 MHz (Band XI)

l) 679-736 MHz (Band XII)

m) 757-807 MHz (Band XIII)

n) 768-818 MHz (Band XIV)

o) 810-865 MHz (Band XIX)

p) 712-782 MHz (Band XX)

q) 1427.9-1482.9 MHz (Band XXI)

r) 3390-3510 MHz (Band XXII)

s) 1830 MHz to 1935 MHz (Band XXV)

t) 794 MHz to 869 MHz (Band XXVI)

u) N/A (Band XXXII)

UTRA 3,84 Mcps TDD option, UTRA 1,28 Mcps TDD option and UTRA 7.68 Mcps TDD option:

a) 1880 MHz to 1940 MHz
1990 MHz to 2045 MHz

b) 1830 MHz to 2010 MHz

c) 1890 MHz to 1950 MHz

d) 2550 MHz to 2640MHz

e) 2280MHz to 2420MHz

f) 1860 MHz to 1940 MHz

For BS capable of multi-band operation, the total receiver exclusion band shall be the combination of the exclusion bands for each operating band supported by the BS.

4.6 BS test configurations

The present clause defines the BS test configurations that shall be used for demonstrating conformance. A single UTRA carrier shall be used for testing of single-carrier capable BS. For other BS types, the test configurations in Table 4.6.1 shall be used. The test configurations (UTCx) are defined in TS 25.141 [3], subclause 4.12.

Table 4.6.1: Test configurations for UTRA BS

BS test case	BS capable of multi-carrier operation in contiguous spectrum in single band only	BS capable of multi-carrier operation in both contiguous and non-contiguous spectrum in single band	BS capable of multi-band operation
Emission tests	UTC1	UTC2	UTC1/2 (Note 1), UTC4
Immunity tests	UTC1	UTC2	UTC1/2 (Note 1), UTC4
NOTE 1: UTC1 or UTC2 shall be applied in each supported operating band according to the respective capability in each band, as defined in the 2^nd and 3^rd column of the table.