6.5 OTA Transmit ON/OFF power

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

6.5.1 General

OTA transmitter ON/OFF power requirements apply only to TDD operation of E-UTRA and NR.

The OTA Transmit ON/OFF power requirements are co-location requirements and specified as the power sum of the supported polarization(s) at the co-location reference antenna conducted output(s), see clause 4.15.

6.5.2 OTA Transmitter OFF power

6.5.2.1 Definition and applicability

OTA transmitter OFF power is defined as the mean power measured over 70/N μs filtered with a square filter of bandwidth equal to the Base Station RF Bandwidth(s) centred on the central frequency of the Base Station RF Bandwidth (s) during the transmitter OFF period. For UTRA and E-UTRA, N=1. For NR, N = SCS/15, where SCS is Sub Carrier Spacing in kHz.

For multi-band RIBs and single band RIBs supporting transmission in multiple bands, the requirement is only applicable during the transmitter OFF period in all supported operating bands.

For AAS BS supporting intra-band contiguous CA, the transmitter OFF power is defined as the mean power measured over 70/N us filtered with a square filter of bandwidth equal to the Aggregated BS Channel Bandwidth BWChannel_CA centred on (Fedge,high+Fedge,low)/2 during the transmitter OFF period. N is equal to 1 if there are any UTRA or E-UTRA carriers, or for NR N = SCS/15, where SCS is the smallest supported Sub Carrier Spacing in kHz in the Aggregated BS Channel Bandwidth.

6.5.2.2 Minimum Requirement

For AAS BS in MSR operation the minimum requirement is defined in TS 37.105 [6], clause 9.5.2.2.

For AAS BS in single RAT UTRA operation the minimum requirement is defined in TS 37.105 [6], clause 9.5.2.3.

For AAS BS in single RAT E-UTRA operation the minimum requirement is defined in TS 37.105 [6], clause 9.5.2.4.

6.5.2.3 Test purpose

The purpose of this test is to verify the OTA transmitter OFF power is within the limits of the minimum requirements.

6.5.2.4 Method of test

6.5.2.4.1 Initial conditions

Test environment:

– normal; see annex G.2.

RF channels to be tested:

– M; see clause 4.12.1.

Base Station RF Bandwidth positions to be tested:

– MRFBW in single band operation, see clause 4.12.1; BRFBW_T’RFBW and B’RFBW_TRFBW in multi-band operation; see clause 4.12.1.

6.5.2.4.2 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) Set the AAS BS in the direction of the declared beam peak direction of the beam direction pair, for the beam to be tested.

4) Place the co-location test antenna as specified in clause 4.15.

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

6) Set the AAS BS to output according to the applicable test configuration in clause 5 using the corresponding test models or set of physical channels in clause 4.12.2. For single carrier set the AAS BS to transmit at manufacturers declared rated carrier TRP (Prated,c,TRP).

7) For E-UTRA and UTRA, measure the mean power spectral density at the output(s) of co-location test antennaas power sum over all supported polarizations over 70μs filtered with a square filter of bandwidth equal to the RF bandwidth of the AAS BS centred on the central frequency of the RF bandwidth. 70μs average window centre is set from 35μs after end of one transmitter ON period + 17μs to 35μs before start of next transmitter ON period – 17μs.

For NR, measure the mean power spectral density over 70/N μs filtered with a square filter of bandwidth equal to the RF bandwidth of the TAB connector centred on the central frequency of the RF bandwidth. 70/N μs average window centre is set from 35/N μs after end of one transmitter ON period + 10 μs to 35/N μs before start of next transmitter ON period – 10 μs. N = SCS/15, where SCS is Sub Carrier Spacing in kHz.

8) For an AAS BS supporting contiguous CA, measure the mean power spectral density at the output(s) of co-location test antenna as power sum over all supported polarizations over 70 μs filtered with a square filter of bandwidth equal to the Aggregated Channel Bandwidth BWChannel_CA centred on (Fedge_high+Fedge_low)/2. 70 μs average window centre is set from 35 μs after end of one transmitter ON period + 17 μs to 35μs before start of next transmitter ON period – 17 μs.

In addition, for a multi-band RIB, the following steps shall apply:

9) For a multi-band RIB 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.

6.5.2.5 Test Requirement

The mean power spectral density measured according to clause 6.5.2.4.2 shall be less than -102.6 dBm/MHz for carrier frequency f ≤ 3.0 GHz.

The mean power spectral density measured according to clause 6.5.2.4.2 shall be less than -102.4 dBm/MHz for carrier frequency 3.0 GHz < f ≤ 4.2 GHz.

For a multi-band RIB, the requirement is only applicable during the transmitter OFF period in all supported operating bands.

NOTE: If the above Test Requirement differs from the Minimum Requirement then the Test Tolerance applied for this test is non-zero. The Test Tolerance for this test is defined in clause 4.1.2 and the explanation of how the Minimum Requirement has been relaxed by the Test Tolerance given in annex C.

6.5.3 OTA Transmitter transient period

6.5.3.1 Definition and applicability

The OTA transmitter transient period is the time period during which the transmitter unit is changing from the OFF period to the ON period or vice versa. The OTA transmitter transient period is illustrated in figure 6.5.3.1-1.

Figure 6.5.3.1-1: Illustration of the relations of transmitter ON period,
transmitter OFF period and transmitter transient period

This requirement applies at RIB supporting reception in the operating band and is measured at the co-location reference antenna conducted outputs.

6.5.3.2 Minimum Requirement

This requirement does not apply to single RAT UTRA operation.

For AAS BS in single RAT E-UTRA and NR operation, the minimum requirement is defined in TS 37.105 [6], clause 9.5.3.2.

6.5.3.3 Test purpose

The purpose of this test is to verify that the OTA transmitter transient periods are within the limits of the minimum requirements.

6.5.3.4 Method of test

6.5.3.4.1 Initial conditions

Test environment:

– normal; see annex G.2.

RF channels to be tested for single carrier:

– M; see clause 4.12.1.

RF bandwidth positions to be tested for multi-carrier and/or CA:

– MRFBW in single-band operation, see clause 4.12.1; BRFBW_T’RFBW and B’RFBW_TRFBW in multi-band operation, see clause 4.12.1.

6.5.3.4.2 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) Set the AAS BS in the direction of the declared beam peak direction of the beam direction pair, for the beam to be tested.

4) Place the co-location test antenna as specified in clause 4.15.

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

6) Set the AAS BS to output according to the applicable test configuration in clause 5 using the corresponding test models or set of physical channels in clause 4.12.2. For single carrier set the AAS BS to transmit at manufacturers declared rated carrier TRP (Prated,c,TRP).

7) Measure the mean power spectral density at the output(s) of co-location test antenna as power sum over all supported polarizations over 70μs filtered with a square filter of bandwidth equal to the RF bandwidth of the AAS BS centred on the central frequency of the RF bandwidth. 70μs average window centre is set from 35μs after end of one transmitter ON period + 17μs to 35μs before start of next transmitter ON period – 17μs.

8) For an AAS BS supporting contiguous CA, measure the mean power spectral density at the output(s) of co-location test antenna as power sum over all supported polarizations over 70 μs filtered with a square filter of bandwidth equal to the Aggregated Channel Bandwidth BWChannel_CA centred on (Fedge_high+Fedge_low)/2. 70 μs average window centre is set from 35 μs after end of one transmitter ON period + 17 μs to 35μs before start of next transmitter ON period – 17 μs.

In addition, for a multi-band RIB, the following steps shall apply:

9) For a multi-band RIB 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.

6.5.3.5 Test Requirement

The mean power spectral density measured according to clause 6.5.3.4.2 shall be less than -102.6 dBm/MHz for carrier frequency f ≤ 3.0 GHz.

The mean power spectral density measured according to clause 6.5.3.4.2 shall be less than -102.4 dBm/MHz for carrier frequency 3.0 GHz < f ≤ 4.2 GHz.

For a multi-band RIB, the requirement is only applicable during the transmitter OFF period in all supported operating bands.

NOTE: If the above Test Requirement differs from the Minimum Requirement then the Test Tolerance applied for this test is non-zero. The Test Tolerance for this test is defined in clause 4.1.2 and the explanation of how the Minimum Requirement has been relaxed by the Test Tolerance is given in annex C.