6.2 Radiated transmit power
38.176-23GPPIntegrated Access and Backhaul (IAB) conformance testingNRPart 2: radiated conformance testingRelease 17TS
6.2.1 Definition and applicability
IAB-DU and IAB-MT type 1-H, IAB-DU and IAB-MT type 1-O and IAB-DU and IAB-MT type 2-O are declared to support one or more beams, as per manufacturer’s declarations. Radiated transmit power is defined as the EIRP level for a declared beam at a specific beam peak direction. Declarations are done for IAB-DU and IAB-MT separately.
For each beam, the requirement is based on declaration of a beam identity, reference beam direction pair, beamwidth, rated beam EIRP, OTA peak directions set, the beam direction pairs at the maximum steering directions and their associated rated beam EIRP and beamwidth(s).
For a declared beam and beam direction pair, the rated beam EIRP level is the maximum power that the IAB-DU or IAB-MT 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.
NOTE 1: OTA peak directions set is set of beam peak directions for which the EIRP accuracy requirement is intended to be met. The beam peak directions are related to a corresponding contiguous range or discrete list of beam centre directions by the beam direction pairs included in the set.
NOTE 2: A beam direction pair is data set consisting of the beam centre direction and the related 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:
– Prated,c,FBWlow for lower supported frequency range, and
– Prated,c,FBWhigh for higher supported frequency range.
For frequencies in between FFBWlow and FFBWhigh the rated carrier EIRP is:
– Prated,c,FBWlow, for the carrier whose carrier frequency is within frequency range FFBWlow ≤ f < (FFBWlow +FFBWhigh) / 2,
– Prated,c,FBWhigh, for the carrier whose carrier frequency is within frequency range (FFBWlow +FFBWhigh) / 2 ≤ f ≤FFBWhigh.
6.2.2 Minimum requirement
Radiated transmit power minimum requirement for IAB-DU type 1-H, IAB-DU type 1-O, IAB-MT type 1-H and IAB-MT type 1-O is defined in TS 38.174 [2], clause 9.2.2.
Radiated transmit power minimum requirement for IAB-DU type 2-O and IAB-MT type 2-O is defined in TS 38.174 [2], clause 9.2.3.
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 IAB-DU type 1-H, IAB-DU type 1-O, IAB-MT type 1-H, IAB-MT type 1-O, IAB-DU type 2-O and IAB-MT type 2-O .
6.2.4 Method of test
6.2.4.1 Initial conditions
Test environments:
– Normal, see annex B.2.
RF channels to be tested for single carrier: B, M and T; see clause 4.9.1.
IAB RF bandwidth positions to be tested for multi-carrier and/or CA:
– BRFBW, MRFBW and TRFBW in single-band operation, see clause 4.9.1,
– BRFBW_T’RFBW and B’RFBW_TRFBW in multi-band operation, see clause 4.9.1.
Directions to be tested:
– OTA peak directions set reference beam direction pair (D.8), and
– OTA peak directions set maximum steering directions (D.10).
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 (D.3, D.11).
NOTE: Tests under extreme power supply conditions also test extreme temperatures.
6.2.4.2 Procedure
For normal test environment conditions in OTA domain, the test procedure is as follows:
1) Place the IAB at the positioner.
2) Align the manufacturer declared coordinate system orientation (D.2) of the IAB with the test system.
3) Orient the positioner (and IAB) in order that the direction to be tested aligns with the test antenna.
4) Configure the beam peak direction of the IAB according to the declared beam direction pair.
5) Set the IAB to transmit according to the applicable test configuration in clause 4.8 using the corresponding test model(s) in clause 4.9.2.
For a IAB 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(s) in clause 4.9.2 on all carriers configured.
For an IAB node declared to be capable of simultaneous transmission between IAB-DU and IAB-MT (D.IAB-3), use the applicable test signal configuration and corresponding power setting specified in clauses 4.7.2 and 4.8 using the corresponding test model(s) in clause 4.9.2 for IAB-MT and IAB-DU.
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 = EIRPp1 + EIRPp2.
7) Test steps 3 to 6 are repeated for all declared beams (D.3) and their reference beam direction pairs and maximum steering directions (D.8 and D.10).
For multi-band capable IAB and single band tests, repeat the steps above per involved operating band where single band test configurations and test models shall apply with no carriers activated in the other band.
For extreme conditions tests the methods in annex B.7 may be used.
6.2.5 Test requirement
6.2.5.1 IAB-DU
For each declared conformance beam direction pair, the EIRP measurement results in clause 6.2.4.2 shall remain within the values provided in table 6.2.5.1-1, relative to the manufacturer’s declared rated beam EIRP (D.11) value:
Table 6.2.5.1-1: Test requirement for radiated transmit power for IAB-DU
|
Normal test environment |
|
|
IAB-DU type 1-H |
f ≤ 3 GHz: ± 3.3 dB |
|
3 GHz < f ≤ 6 GHz: ± 3.5 dB |
|
|
IAB-DU type 1-O |
f ≤ 3 GHz: ± 3.3 dB |
|
3 GHz < f ≤ 6 GHz: ± 3.5 dB |
|
|
IAB-DU type 2-O |
24.15 GHz < f ≤ 29.5 GHz: ± 5.1 dB 37 GHz < f ≤ 43.5 GHz: ± 5.4 dB |
6.2.5.2 IAB-MT
For each declared conformance beam direction pair, the EIRP measurement results in clause 6.2.4.2 shall remain within the values provided in table 6.2.5.2-1, relative to the manufacturer’s declared rated beam EIRP (D.11) value:
Table 6.2.5.2-1: Test requirement for radiated transmit power for IAB-MT
|
Normal test environment |
|
|
IAB-MT type 1-H |
f ≤ 3 GHz: ± 3.3 dB |
|
3 GHz < f ≤ 6 GHz: ± 3.5 dB |
|
|
IAB-MT type 1-O |
f ≤ 3 GHz: ± 3.3 dB |
|
3 GHz < f ≤ 6 GHz: ± 3.5 dB |
|
|
IAB-MT type 2-O |
24.15 GHz < f ≤ 29.5 GHz: ± 6 dB 37 GHz < f ≤ 43.5 GHz: ± 6 dB |