6.5 OTA transmit ON/OFF power

38.176-23GPPIntegrated Access and Backhaul (IAB) conformance testingNRPart 2: radiated conformance testingRelease 17TS

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

6.5.1 OTA transmitter OFF power

6.5.1.1 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 transmission bandwidth configuration of the IAB (BW_Config) centred on the assigned channel frequency during the transmitter OFF period. N = SCS/15, where SCS is Sub Carrier Spacing in kHz.

For IAB node supporting intra-band contiguous CA, the OTA 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 IAB-DU channel bandwidth or IAB-MT channel bandwidth BW_{Channel_CA} centred on (F_edge,high+F_edge,low)/2 during the transmitter OFF period. N = SCS/15, where SCS is the smallest supported Sub Carrier Spacing in kHz in the aggregated IAB-DU channel bandwidth or aggregated IAB-MT channel bandwidth.

For IAB type 1-O, the transmitter OFF power is defined as the output power at the co-location reference antenna conducted output(s). For IAB type 2-O the transmitter OFF power is defined as TRP.

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.

6.5.1.2 Minimum requirement

The minimum requirement for IAB-DU type 1-O is in TS 38.174 [2], clause 9.5.2.2.

The minimum requirement for IAB-DU type 2-O is in TS 38.174 [2], clause 9.5.2.3.

The minimum requirement for IAB-MT type 1-O is in TS 38.174 [2], clause 9.5.2.4.

The minimum requirement for IAB-MT type 2-O is in TS 38.174 [2], clause 9.5.2.5.

6.5.1.3 Test purpose

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

6.5.1.4 Method of test

Requirement is tested together with transmitter transient period, as described in clause 6.5.2.4.

6.5.1.5 Test requirements

The conformance testing of transmit OFF power is included in the conformance testing of transmitter transient period; therefore, see clause 6.5.2.5 for test requirements.

6.5.2 OTA transmitter transient period

6.5.2.1 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 6.5.2.1-1.

Figure 6.5.2.1-1: Illustration of the relations of transmitter ON period, transmitter OFF period and transmitter transient period for IAB

For IAB type 1-O, this requirement applies for RIB supporting transmission in the operating band and is measured at the co-location test antenna conducted outputs. For IAB type 2-O, the requirement applies at each RIB supporting transmission in the operating band.

6.5.2.2 Minimum requirement

The minimum requirement for IAB-DU type 1-O is in TS 38.174 [2], clause 9.5.3.2.

The minimum requirement for IAB-DU type 2-O is in TS 38.174 [2], clause 9.5.3.3.

The minimum requirement for IAB-MT type 1-O is in TS 38.174 [2], clause 9.5.3.4.

The minimum requirement for IAB-MT type 2-O is in TS 38.174 [2], clause 9.5.3.5.

6.5.2.3 Test purpose

The purpose of this test is to verify the OTA transmitter transient periods are 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 B.2.

RF channels to be tested: M; see clause 4.9.1.

Base Station RF Bandwidth positions to be tested for multi-carrier and/or CA:

– M_RFBW in single band operation, see clause 4.9.1;

– B_RFBW_T’_RFBW and B’_RFBW_T_RFBW in multi-band operation; see clause 4.9.1.

Directions to be tested:

– The requirement for IAB type 1-O is specified as co-location requirement. For general description of co-location requirements, refer to clause 4.12.

– The requirement for IAB type 2-O is verified by an EIRP measurement at a direction corresponding to the OTA peak directions set reference beam direction pair (D.8) for the beam identifier (D.3) which provides the highest intended EIRP.

6.5.2.4.2 Procedure

6.5.2.4.2.1 General procedure

1) Place the IAB node at the positioner.

2) Align the manufacturer declared coordinate system orientation (D.2) of the IAB node with the test system.

6.5.2.4.2.2 IAB type 1-O

3) Set the IAB node 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 4.12.

5) Configure the beam peak direction of the IAB node according to the declared beam direction pair.

6) Set the IAB node to transmit according to the applicable test configuration in clause 4.8 using the corresponding test models or set of physical channels in clause 4.9.2.

For an IAB node declared to be capable of Simultaneous transmission between IAB-DU and IAB-MT (D. IAB-3), above steps will apply for IAB-MT or IAB-DU respectively according to test singal configuration and test models specified in clauses 4.7.2 and 4.8 with both IAB-MT and IAB-DU configured.

For an IAB node declared to be capable of multi-carrier and/or CA operation, use the applicable test signal configuration and corresponding power setting specified in clauses 4.7.2 and 4.8 using the corresponding test models or set of physical channels in clause 4.9.2 on all carriers configured.

7) Measure the mean power spectral density at the output(s) of co-location test antenna as power sum over two orthogonal polarizations over 70/N μs filtered with a square filter of bandwidth equal to the RF bandwidth of the IAB node 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 IAB node supporting contiguous CA, measure the mean power spectral density at the output(s) of co-location test antenna as power sum over two orthogonal polarizations over 70/N μs filtered with a square filter of bandwidth equal to the aggregated IAB-DU channel bandwidth or aggregated IAB-MT channel bandwidth BW_{Channel_CA} centred on (F_{edge_high}+F_{edge_low})/2. 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 the smallest supported Sub Carrier Spacing in kHz in the aggregated IAB-DU channel bandwidth or aggregated IAB-MT channel bandwidth.

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.

6.5.2.4.2.3 IAB type 2-O

3) Set the IAB node in the direction of the declared beam peak direction of the beam direction pair, for the beam to be tested.

4) Set the IAB node to transmit according to the applicable test configuration in clause 4.8 using the corresponding test model IAB-DU-FR2-TM1.1 or IAB-MT-FR2-TM1.1 and set of physical channels in clause 4.9.2.

For a IAB node declared to be capable of multi-carrier and/or CA operation, use the applicable test signal configuration and corresponding power setting specified in clauses 4.7.2 and 4.8 using the corresponding test model IAB-DU-FR2-TM1.1 or IAB-MT-FR2-TM1.1 and set of physical channels in clause 4.9.2 on all carriers configured.

5) Measure the mean EIRP spectral density as the power sum over two orthogonal polarizations over 70/N μs filtered with a square filter of bandwidth equal to the RF bandwidth of the IAB node 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 + 3 μs to 35/N μs before start of next transmitter ON period – 3 μs. N = SCS/15, where SCS is Sub Carrier Spacing in kHz.

NOTE: Make sure that the measurement receiver is not overloaded.

6) For an IAB node supporting contiguous CA, measure the mean EIRP spectral density as the power sum over two orthogonal polarizations over 70/N μs filtered with a square filter of bandwidth equal to the aggregated IAB-DU channel bandwidth or aggregated IAB-MT channel bandwidth BW_{Channel_CA} centred on (F_{edge_high}+F_{edge_low})/2. 70/N μs average window centre is set from 35/N μs after end of one transmitter ON period + 3 μs to 35/N μs before start of next transmitter ON period – 3 μs. N = SCS/15, where SCS is the smallest supported Sub Carrier Spacing in kHz in the aggregated IAB-DU channel bandwidth or aggregated IAB-MT channel bandwidth.

6.5.2.5 Test requirements

6.5.2.5.1 IAB type 1-O

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 ≤ 6.0 GHz.

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

For IAB simultaneous transmission, the requirement is only applicable during the transmitter OFF period for both IAB-DU and IAB-MT.

6.5.2.5.2 IAB type 2-O

The measured mean EIRP spectral density according to clause 6.5.2.4.2 shall be less than -33.1 + P_rated,c,EIRP– P_rated,c,TRP dBm/MHz for carrier frequency 24.15 GHz < f ≤ 29.5 GHz, where P_rated,c,EIRPis the value declared for the reference beam direction pair (D.8) for the beam identifier (D.3) which provides the highest intended EIRP.

The measured mean EIRP spectral density according to clause 6.5.2.4.2 shall be less than -32.7 + P_rated,c,EIRP– P_rated,c,TRP dBm/MHz for carrier frequency 37 GHz < f ≤ 43.5 GHz, where P_rated,c,EIRPis the value declared for the reference beam direction pair (D.8) for the beam identifier (D.3) which provides the highest intended EIRP.

For IAB simultaneous transmission, the requirement is only applicable during the transmitter OFF period for both IAB-DU and IAB-MT.