6 Conducted transmitter characteristics
38.1813GPPNRRelease 17Satellite Access Node conformance testingTS
6.1 General
6.2 Base station output power
6.3 Output power dynamics
6.4 Transmit ON/OFF power
The requirement is not applicable in this version of the specification.
6.5 Transmitted signal quality
6.5.3 Modulation quality
6.5.3.1 Definition and applicability
Modulation quality is defined by the difference between the measured carrier signal and an ideal signal. Modulation quality can e.g. be expressed as Error Vector Magnitude (EVM). The Error Vector Magnitude is a measure of the difference between the ideal symbols and the measured symbols after the equalization. This difference is called the error vector.
For SAN type 1-H this requirement shall be applied at each TAB connector supporting transmission in the operating band.
6.5.3.2 Minimum Requirement
The minimum requirement is in TS 38.108 [x], clause 6.5.2.2.
6.5.3.3 Test purpose
The test purpose is to verify that modulation quality is within the limit specified by the minimum requirement.
6.5.3.4 Method of test
6.5.3.4.1 Initial conditions
Test environment: Normal; see annex B.2.
RF channels to be tested for single carrier: B, M and T; see clause 4.9.1.
RF bandwidth positions to be tested for multi-carrier:
– BRFBW, MRFBW and TRFBW in single-band operation, see clause 4.9.1.
6.5.3.4.2 Procedure
The minimum requirement is applied to all TAB connectors, they may be tested one at a time or multiple TAB connectors may be tested in parallel as shown in annex D.3.1 for SAN type 1-H. Whichever method is used the procedure is repeated until all TAB connectors necessary to demonstrate conformance have been tested.
1) For a TAB connector declared to be capable of single carrier operation only ([D.16]), set the TAB connector under test to transmit a signal according to the applicable test configuration in clause 4.8 using the corresponding test models:
– NR-FR1-TM3.1 if highest modulation order supported by SAN is 64QAM, or
– NR-FR1-TM3.2 if highest modulation order supported by SAN is 16QAM, or
– NR-FR1-TM3.3 if highest modulation order supported by SAN is QPSK.
For TAB connector declared to be capable of multi-carrier operation, set the TAB connector under test to transmit according to the applicable test configuration and corresponding power setting specified in clauses 4.7 and 4.8 using the corresponding test models on all carriers configured:
– NR-FR1-TM3.1 if highest modulation order supported by SAN is 64QAM, or
– NR-FR1-TM3.2 if highest modulation order supported by SAN is 16QAM, or
– NR-FR1-TM3.3 if highest modulation order supported by SAN is QPSK.
For NR-FR1-TM3.1a and NR-FR1-TM3.1b, power back-off shall be applied if it is declared.
2) Measure the EVM and frequency error as defined in [annex H].
6.5.3.5 Test requirements
The EVM of each NR carrier for different modulation schemes on PDSCH shall be less than the limits in table 6.5.3.5-1.
Table 6.5.3.5-1 EVM requirements for SAN type 1-H carrier
|
Modulation scheme for PDSCH |
Required EVM |
|
QPSK |
17.5 % |
|
16QAM |
12.5 % |
|
64QAM (NOTE) |
8 % |
|
NOTE: EVM requirement for 64QAM is optional. |
|
EVM shall be evaluated for each NR carrier over all allocated resource blocks and downlink slots. Different modulation schemes listed in table 6.5.3.5-1 shall be considered for rank 1.
For all bandwidths, the EVM measurement shall be performed for each NR carrier over all allocated resource blocks and downlink slots within 10 ms measurement periods. The boundaries of the EVM measurement periods need not be aligned with radio frame boundaries.
Table 6.5.3.5-2, 6.5.3.5-3, 6.5.3.5-4 below specify the EVM window length (W) for normal CP for SAN type 1-H.
Table 6.5.3.5-2 EVM window length for normal CP for NR, FR1, 15 kHz SCS
|
Channel |
FFT size |
CP length for symbols 1‑6 and 8-13 in FFT samples |
EVM window length W |
Ratio of W to total CP length for symbols 1‑6 and 8-13 (Note) (%) |
|
5 |
512 |
36 |
14 |
40 |
|
10 |
1024 |
72 |
28 |
40 |
|
15 |
1536 |
108 |
44 |
40 |
|
20 |
2048 |
144 |
58 |
40 |
|
NOTE: These percentages are informative and apply to a slot’s symbols 1 to 6 and 8 to 13. Symbols 0 and 7 have a longer CP and therefore a lower percentage. |
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Table 6.5.3.5-3 EVM window length for normal CP for NR, FR1, 30 kHz SCS
|
Channel |
FFT size |
CP length for symbols 1‑13 in FFT samples |
EVM window length W |
Ratio of W to total CP length for symbols 1‑13 (Note) (%) |
|
|
5 |
256 |
18 |
8 |
40 |
|
|
10 |
512 |
36 |
14 |
40 |
|
|
15 |
768 |
54 |
22 |
40 |
|
|
20 |
1024 |
72 |
28 |
40 |
|
|
NOTE: These percentages are informative and apply to a slot’s symbols 1 through 13. Symbol 0 has a longer CP and therefore a lower percentage. |
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Table 6.5.3.5-4 EVM window length for normal CP for NR, FR1, 60 kHz SCS
|
Channel |
FFT size |
CP length in FFT samples |
EVM window length W |
Ratio of W to total CP length (Note) (%) |
|
10 |
256 |
18 |
8 |
40 |
|
15 |
384 |
27 |
11 |
40 |
|
20 |
512 |
36 |
14 |
40 |
|
NOTE: These percentages are informative and apply to all OFDM symbols within subframe except for symbol 0 of slot 0 and slot 2. Symbol 0 of slot 0 and slot 2 may have a longer CP and therefore a lower percentage. |
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6.6 Unwanted emissions
6.6.3 Adjacent Channel Leakage Power Ratio (ACLR)
6.6.3.1 Definition and applicability
Adjacent Channel Leakage power Ratio (ACLR) is the ratio of the filtered mean power centred on the assigned channel frequency to the filtered mean power centred on an adjacent channel frequency.
The requirements shall apply outside the Satellite Access Node RF Bandwidth or Radio Bandwidth whatever the type of transmitter considered (e.g. single carrier or multi-carrier) and for all transmission modes foreseen by the manufacturer’s specification.
6.6.3.2 Minimum requirement
The minimum requirement applies per single-band connector supporting transmission in the operating band.
The minimum requirement for SAN type 1-H is defined in TS 38.108 [x], clause 6.6.3.4.
6.6.3.3 Test purpose
To verify that the adjacent channel leakage power ratio requirement shall be met as specified by the minimum requirement.
6.6.3.4 Method of test
6.6.3.4.1 Initial conditions
Test environment: Normal; see annex B.2.
RF channels to be tested for single carrier: B, M and T; see clause 4.9.1.
Satellite Access Node RF Bandwidth positions to be tested for multi-carrier:
– BRFBW, MRFBW and TRFBW in single-band operation; see clause 4.9.1.
6.6.3.4.2 Procedure
For SAN type 1-H where there may be multiple TAB connectors, they may be tested one at a time or multiple TAB connectors may be tested in parallel as shown in annex D.3.1 for SAN type 1-H. Whichever method is used the procedure is repeated until all TAB connectors necessary to demonstrate conformance have been tested.
1) Connect the single-band connector or multi-band connector under test to measurement equipment as shown in annex D.3.1 for SAN type 1-H. All connectors not under test shall be terminated.
The measurement device characteristics shall be:
– Measurement filter bandwidth: defined in clause 6.6.3.5.
– Detection mode: true RMS voltage or true average power.
2) For a connectors declared to be capable of single carrier operation only ([D.16]), set the representative connectors under test to transmit according to the applicable test configuration in clause 4.8 using the corresponding test models NR-FR1‑TM 1.1 in clause 4.9.2 at rated carrier output power Prated,c,TABC for SAN type 1-H ([D.21]).
For a connector under test declared to be capable of multi-carrier operation set the connector under test to transmit on all carriers configured using the applicable test configuration and corresponding power setting specified in clauses 4.7 and 4.8 using the corresponding test models or set of physical channels in clause 4.9.2.
3) Measure ACLR for the frequency offsets both side of channel frequency as specified in table 6.6.3.5.2‑1. In multiple carrier case only offset frequencies below the lowest and above the highest carrier frequency used shall be measured.
4) For the ACLR requirement applied inside sub-block gap for non-contiguous spectrum operation:
a) Measure ACLR inside sub-block gap or Inter RF Bandwidth gap as specified in clause 6.6.3.5.2, if applicable.
b) Measure CACLR inside sub-block gap or Inter RF Bandwidth gap as specified in clause 6.6.3.5.2, if applicable.
5) Repeat the test with the channel set-up according to NR-FR1-TM 1.2 in clause 4.9.2.
6.6.3.5 Test requirements
6.6.3.5.1 General requirements
The ACLR requirements in clause 6.6.3.5.2 shall apply as described in clauses 6.6.3.5.3 or 6.6.3.5.4.
6.6.3.5.2 Limits
The ACLR is defined with a square filter of bandwidth equal to the transmission bandwidth configuration of the transmitted signal (BWConfig) centred on the assigned channel frequency and a filter centred on the adjacent channel frequency according to the tables below.
The ACLR shall be higher than the value specified in Table 6.6.3.5.2-1/2.
Table 6.6.3.5.2-1: SAN ACLR limit for GEO class
|
SAN channel bandwidth of lowest/highest carrier transmitted BWChannel (MHz) |
SAN adjacent channel centre frequency offset below the lowest or above the highest carrier centre frequency transmitted |
Assumed adjacent channel carrier (informative) |
Filter on the adjacent channel frequency and corresponding filter bandwidth |
ACLR limit |
|
5, 10, 15, 20 |
BWChannel |
NR of same BW (NOTE 2) |
Square (BWConfig) (NOTE 1) |
14 |
|
2 x BWChannel |
NR of same BW (NOTE 2) |
Square (BWConfig) (NOTE 1) |
14 |
|
|
NOTE 1: BWChannel and BWConfig are the SAN channel bandwidth and transmission bandwidth configuration of the lowest/highest carrier transmitted on the assigned channel frequency. NOTE 2: With SCS that provides largest transmission bandwidth configuration (BWConfig). |
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Table 6.6.3.5.2-2: SAN ACLR limit for LEO class
|
SAN channel bandwidth of lowest/highest carrier transmitted BWChannel (MHz) |
SAN adjacent channel centre frequency offset below the lowest or above the highest carrier centre frequency transmitted |
Assumed adjacent channel carrier (informative) |
Filter on the adjacent channel frequency and corresponding filter bandwidth |
ACLR limit |
|
5, 10, 15, 20 |
BWChannel |
NR of same BW (NOTE 2) |
Square (BWConfig) (NOTE 1) |
24 |
|
2 x BWChannel |
NR of same BW (NOTE 2) |
Square (BWConfig) (NOTE 1) |
24 |
|
|
NOTE 1: BWChannel and BWConfig are the SAN channel bandwidth and transmission bandwidth configuration of the lowest/highest carrier transmitted on the assigned channel frequency. NOTE 2: With SCS that provides largest transmission bandwidth configuration (BWConfig). |
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6.6.3.5.3 SAN type 1-H
6.7 Transmitter intermodulation
The requirement is not applicable in this version of the specification.