6.3 OTA Base Station output 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

6.3.1 General

The OTA AAS BS base station output power is declared as TRP.

6.3.2 OTA Maximum output power

6.3.2.1 Definition and applicability

The rated carrier TRP shall be as specified for UTRA in table 6.3.2.1-1, and for E-UTRA and NR in table 6.3.2.1-2

Table 6.3.2.1-1: UTRA OTA AAS Base Station rated output power limits for BS classes

OTA AAS BS class	P_rated,c,TRP
Wide Area BS	(NOTE)
Medium Range BS	≤ 44 dBm
Local Area BS	≤ 30 dBm
NOTE: There is no upper limit for the P_rated,c,TRP of the Wide Area Base Station.

Table 6.3.2.1-2: E-UTRA and NR OTA AAS Base Station rated output power limits for BS classes

OTA AAS BS class	P_rated,c,TRP
Wide Area BS	(NOTE)
Medium Range BS	≤ 47 dBm
Local Area BS	≤ 33 dBm
NOTE: There is no upper limit for the P_rated,c,TRP of the Wide Area Base Station.

6.3.2.2 Minimum Requirement

For AAS BS in MSR operation the minimum requirement is defined in TS 37.105 [6], clause 9.3.2.2.

For AAS BS in single RAT UTRA operation the minimum requirement is defined in TS 37.105 [6], clause 9.3.2.3.

For AAS BS in single RAT E-UTRA operation the minimum requirement is defined in TS 37.105 [6], clause 9.3.2.4.

6.3.2.3 Test purpose

The test purpose is to verify the accuracy of the maximum carrier TRP (P_max,c,TRP) across the frequency range for all RIBs in the AAS BS.

6.3.2.4 Method of test

6.3.2.4.1 Initial conditions

Test environment: Normal; see annex G.2.

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.

As the requirement is TRP the beam pattern(s) may be set up to optimise the TRP measurement procedure (see annex F) as long as the required TRP level is achieved.

6.3.2.4.2 Procedure

The following procedure for measuring TRP is based on the directional power measurements as described in in Annex F. An alternative method to measure TRP is to use a characterized and calibrated reverberation chamber if so follow steps 1, 4, 5, and 7.

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) Configure the AAS BS such that the beam peak direction(s) applied during the power measurement step 6 are consistent with the grid and measurement approach for the TRP test.

4) Set the AAS BS 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.

5) Orient the positioner (and BS) in order that the direction to be tested aligns with the test antenna such that measurements to determine TRP can be performed (see annex F).

6) Measure the radiated power for any two orthogonal polarizations (denoted p1 and p2) and calculate total radiated transmit power for particular beam direction pair as EIRP = EIRPp1 + EIRPp2.

If the test chamber is a reverberation chamber measure TRP directly.

7) 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.

8) Calculate TRP using the power measurements.

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.

6.3.2.5 Test Requirement

The TRP measurement result in step 9 of clause 6.3.2.4.2 shall for UTRA, E-UTRA and NR remain:

– within +3.4 dB and -3.4dB of the manufacturer’s declared rated TRP value for carrier frequency f ≤ 3.0 GHz;

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

6.3.3 OTA E-UTRA DL RS power

6.3.3.1 Definition and applicability

This requirement applies to the RIB(s) transmitting primary DL RS.

The DL RS power is the resource element power of the Downlink Reference Symbol at the RIB transmitting the DL RS for a cell.

The absolute DL RS power is indicated on the DL-SCH. The absolute accuracy is defined as the maximum deviation between the DL RS power indicated on the DL-SCH and the DL RS power of each E-UTRA carrier.

6.3.3.2 Minimum Requirement

For AAS BS in MSR operation the minimum requirement is defined in TS 37.105 [6], clause 9.3.3.2.

There is no DL RS power requirement for single RAT UTRA operation.

For AAS BS in single RAT E-UTRA operation the minimum requirement is defined in TS 37.105 [6], clause 9.3.3.4.

6.3.3.3 Test purpose

The test purpose is to verify that the E-UTRA FDD DL RS power is within the limits specified by the minimum requirement.

6.3.3.4 Method of test

6.3.3.4.1 Initial conditions

Test environment: normal: see annex G.2.

RF channels to be tested: B, M and T; see clause 4.12.1.

Beams to be tested: The narrowest declared beam (see table 4.10-1, D9.3, D9.11).

Directions to be tested: The reference beam direction pair (see table 4.10-1, D9.7).

6.3.3.4.2 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 AAS BS to transmit using E‑TM 1.1, in 36.141 [12]TS 36.141 [12] clause 6.1.1.1 at manufacturers declared rated carrier EIRP (P_rated,c,EIRP).

6) Measure the average OFDM symbol power as defined in annex F by measuring the 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.

The DL RS power is measured according to annex F in 36.141 [12]TS 36.141 [12].

In addition, for multi-band RIB(s), the following steps shall apply:

7) For multi-band RIBs and single band tests, repeat the steps above per involved band where single band test configurations and test models shall apply with no carrier activated in the other band.

6.3.3.5 Test Requirement

The DL RS EIRP of each E-UTRA carrier shall be:

within ± 3,4 dB of the declared DL RS EIRP (see table 4.10-1, D9.30) for carrier frequency f ≤ 3.0 GHz.

within ± 3,6 dB of the declared DL RS EIRP (see table 4.10-1, D9.30) for carrier frequency 3.0 GHz < f ≤ 4.2 GHz.