6.2 Radiated Transmit Power

37.145-23GPPActive Antenna System (AAS) Base Station (BS) conformance testingPart 2: radiated conformance testingRelease 17TS

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

6.2.1 Definition and applicability

This is an output power accuracy requirement defined at the RIB during the transmitter ON period.

An AAS BS is declared to support one or more beams. Radiated transmit power is defined as the EIRP level for a declared beam at a specific beam peak direction.

For each beam, the requirement is based on declarations (see table 4.10-1) of a beam identifier (D9.3), reference beam direction pair (D9.7), rated beam EIRP (D9.10) at the reference beam direction pair, OTA peak directions set (D9.8), the beam direction pairs at the maximum steering directions (D9.9) and their associated rated beam EIRP and beamwidth(s) (D9.11) for reference beam direction pair and maximum steering directions.

For a declared beam identifier and beam direction pair, the rated beam EIRP level is the maximum power that the base station is declared to radiate at the associated beam peak direction during the transmitter ON period.

For each beam peak direction associated with a beam direction pair within the OTA peak directions set, a specific rated beam EIRP level may be claimed. Any claimed value shall be met within the accuracy requirement as described below. Rated beam EIRP is only required to be declared for the beam direction pairs subject to conformance testing as detailed in clause 6.2.4.1.

NOTE 1: The OTA peak directions set for a beam is the complete continuous or discrete set of all beam direction for which the EIRP accuracy is intended to be achieved for the beam.

NOTE 2: A beam direction pair consists of a beam centre direction and an associated beam peak direction.

NOTE 3: A declared EIRP value is a value provided by the manufacturer for verification according to the conformance specification declaration requirements, whereas a claimed EIRP value is provided by the manufacturer to the equipment user for normal operation of the equipment and is not subject to formal conformance testing.

For operating bands where the supported fractional bandwidth (FBW) is larger than 6%, two rated carrier EIRP may be declared by manufacturer:

– P_{rated,c,FBWlow} for lower supported frequency range, and

– P_{rated,c,FBWhigh} for higher supported frequency range.

For frequencies in between F_FBWlow and F_FBWhigh the rated carrier EIRP is:

– P_{rated,c,FBWlow,} for the carrier whose carrier frequency is within frequency range F_FBWlow ≤ f < (F_FBWlow +F_FBWhigh) / 2,

– P_{rated,c,FBWhigh,}for the carrier whose carrier frequency is within frequency range (F_FBWlow +F_FBWhigh) / 2 ≤ f ≤F_FBWhigh.

6.2.2 Minimum Requirement

For AAS BS in MSR operation the minimum requirement is defined in TS 37.105 [6], clause 9.2.2.

For AAS BS in single RAT UTRA operation the minimum requirement is defined in TS 37.105 [6], clause 9.2.3.

For AAS BS in single RAT E-UTRA operation the minimum requirement is defined in TS 37.105 [6], clause 9.2.4.

6.2.3 Test purpose

The test purpose is to verify the ability to accurately generate and direct radiated power per beam, across the frequency range and under normal conditions, for all declared beams of the AAS BS.

6.2.4 Method of test

6.2.4.1 Initial conditions

Test environment:

– Normal; see annex G.2.

– Extreme (applies only to OTA AAS BS), see annexes G.3 and G.5.

RF bandwidth positions to be tested: B_RFBW, M_RFBW and T_RFBW in single-band operation, see clause 4.12.1.

B_RFBW_T’_RFBW and B’_RFBW_T_RFBW in multi-band operation, see clause 4.12.1.

Directions to be tested:

– The reference beam direction pair (D9.7)

– The maximum steering directions (D9.9).

Beams to be tested: Declared beam with the highest intended EIRP for the narrowest intended beam corresponding to the smallest BeWθ, or for the narrowest intended beam corresponding to the smallest BeWϕ (D9.3, D9.10).

Under extreme test environment, for OTA AAS BS only, it is sufficient to test on one RF channel or one Base Station RF Bandwidth position, and with one applicable test configuration defined in clauses 4.11 and 5. The direction to be tested is only at reference beam direction pair (D9.7). Testing shall be performed under extreme power supply conditions, as defined in annex G.5.

NOTE: Tests under extreme power supply conditions also test extreme temperatures.

6.2.4.2 Procedure

1) Place the AAS BS at the positioner.

2) Align the manufacturer declared coordinate system orientation (see table 4.10-1, D9.2) of the AAS BS with the test system.

3) Orient the positioner (and BS) in order that the direction to be tested aligns with the test antenna.

4) Configure the beam peak direction of the AAS BS according to the declared beam direction pair.

5) Set the base station to transmit according to the applicable test configuration in clause 5 using the corresponding test model(s) in clause 4.12.2.

In addition, for an AAS BS declared to be capable of multi-carrier and/or CA operation use the applicable test signal configuration and corresponding power setting specified in clause 4.11.

6) Measure EIRP for any two orthogonal polarizations (denoted p1 and p2) and calculate total radiated transmit power for particular beam direction pair as EIRP = EIRP_p1 + EIRP_p2.

7) Test steps 3 to 6 are repeated for all declared beams (see table 4.10-1, D9.3) and their reference beam direction pairs and maximum steering directions (see table 4.10-1, D9.7 and D9.11).

For multi-band capable AAS BS and single band tests, repeat the steps above per involved band where single band test configurations and test models shall apply with no carriers activated in the other band.

8) For extreme conditions tests the methods in annex B.7 may be used where a representative power measurement is taken at both nominal conditions (P_{max,sample,nom}) and extreme conditions (P_{max,sample,ext}) and the delta (Δ_sample) is added to the nominal measurement from step 6 such that P_{max,c,EIRP, extreme} = P_max,c,EIRP + Δ_sample.

6.2.5 Test Requirement

For each declared conformance beam direction pair, in normal conditions, the EIRP measurement result in step 6 of clause 6.2.4.2 shall for UTRA, E-UTRA and NR remain:

– within +3.3 dB and –3.3 dB of the manufacturer’s declared rated beam EIRP value for carrier frequency f ≤ 3.0 GHz;

– within +3.5 dB and –3.5 dB of the manufacturer’s declared rated beam EIRP value for carrier frequency 3.0 GHz < f ≤ 4.2 GHz.

For a OTA AAS BS in extreme conditions, the result in step 8 (P_{max,c,EIRP, extreme}) of clause 6.2.4.2 shall be:

– within +5.2 dB and –5.2 dB of the manufacturer’s declared rated beam EIRP value for carrier frequency f ≤ 3.0 GHz;

– within +5.3 dB and –5.3 dB of the manufacturer’s declared rated beam EIRP value for carrier frequency 3.0 GHz < f ≤ 4.2 GHz.