M.7 EVM
38.176-23GPPIntegrated Access and Backhaul (IAB) conformance testingNRPart 2: radiated conformance testingRelease 17TS
M.7.0 General
For EVM create two sets of , according to the timing and , using the equalizer coefficients from M.6.
The equivalent ideal samples are calculated from (annex M.2.2) and are called .
The EVM is the difference between the ideal signal and the equalized measured signal.
Where:
– T is the set of symbols with the considered modulation scheme being active within the slot,
– is the set of subcarriers within the resource blocks with the considered modulation scheme being active in symbol t,
– is the ideal signal reconstructed by the measurement equipment in accordance with relevant test models,
– is the equalized signal under test.
NOTE: Although the basic unit of measurement is one slot, the equalizer is calculated over the entire 10 ms measurement interval to reduce the impact of noise in the reference signals.
M.7.1 Averaged EVM (TDD)
Let be the number of slots with uplink symbols within a 10 ms measurement interval. For TDD, the averaging in the time domain can be calculated from slots of different 10 ms measurement intervals and should have a minimum of slots averaging length where is the number of slots in a 10 ms measurement interval.
is derived by: Square the EVM results in each 10 ms measurement interval. Sum the squares, divide the sum by the number of EVM relevant locations, square-root the quotient (RMS).
Where is the number of resource blocks with the considered modulation scheme in slot i.
The is calculated, using the maximum of at the window W extremities. Thus is calculated using and is calculated using (l and h, low and high; where low is the timing and and high is the timing ).
In order to unite at least slots, consider the minimum integer number of 10 ms measurement intervals, where is determined by
And for FR1, for 15 kHz SCS, for 30 kHz SCS and for 60 kHz SCS normal CP. For FR2, for 60 kHz SCS and for 120 kHz SCS.
Unite by RMS.
The resulting is compared against the limit.
Annex N (normative):
General rules for statistical testing
Annex O (informative):
Change history
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Change history |
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Date |
Meeting |
TDoc |
CR |
Rev |
Cat |
Subject/Comment |
New version |
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2021-04 |
RAN4#98bis-e |
R4-2106313 |
TS skeleton |
0.0.1 |
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2021-05 |
RAN4#99-e |
R4-2110944 |
TS 38.176-2 skeleton after RAN4#98bis-e Update of IAB conducted conformance TS with agreed TP in RAN4#98bis-e: 1. R4-2106057 TP to TS 38.xxx-2: Clause 4.2~4.5 2. R4-2106055 TP to TS38.176-2 on subclause 4.10 -5 3. R4-2106073 TP for TS 38.176-2: OTA transmit ON/OFF power 4. R4-2106076 TP to TS 38.xxx-2: TX IMD requirements 5. R4-2106077 TP to TS 38.176-2 Annex A for IAB OTA test specification 6. R4-2106078 TP to TS 38.xxx-2: RX IMD requirements 7. R4-2106080 TP to TS 38.176-2 – OTA Sensitivity, clause 7.2, 7.3 8. R4-2106081 TP to TS 38.176-2 – OTA Rx dynamic range, clause 7.3 9. R4-2106082 TP on IBB, OBB and RX spurious for OTA receiver characteristic test 10. R4-2106083 TP to TS 38.146-2 Clause 4.6 Declarations for IAB radiated test specification 11. R4-2106084 TP to TS 38.176-2 – Annex D&E 12. R4-2106051 TP for Annex G and H for OTA IAB test specification |
0.1.0 |
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2021-06 |
RAN4#99-e |
R4-2108096 |
Big TP to 38.176-2 on RF part Update of IAB conducted conformance TS with endorsed TP in RAN4#99-e: 1. R4-2108566 TP to TS 38.176-2 on test efficiency clause 4.13 2. R4-2108570 TP for TS 38.176-2: Test configurations and applicability of requirements 3. R4-2108568 TP to TS 38.176-2:IAB Common test issue on test model-OTA 4. R4-2108572 TP for TS 38.176-2: Annex B and C 5. R4-2108574 TP to TS 38.176-2 -Clause 4.1 7. R4-2108578 TP to 38.176-2 Editor update – editorials 8. R4-2108579 TP for TS 38.176-2: OTA transmitted signal quality 9. R4-2108580 TP to TS 38.176-2: clauses 6.1, 6.2, 6.3 and 6.7 10. R4-2108088 TP to TS 38.176-2 – OTA Tx dynamic range, clause 6.4 11. R4-2110608 TP to TS 38.176-2: RX ICS requirements, ZTE 12. R4-2111178 TP on IBB, OBB and RX spurious for OTA receiver characteristic test 13. R4-2111406 TP to TS 38.176-2 – OTA Sensitivity, clause 7.2, 7.3 14. R4-2108583 TP to TS 38.176-2 Clause 4.6 Declarations for IAB radiated test specification 15. R4-2108584 TP to TS38.176-2 on Annex I and Annex K 16. R4-2108585 TP to TS 38.176-2: Annex L and M: In-channel TX test 17. R4-2108586 TP to TS 38.176-2 – Clause 3 18. R4-2108587 IAB-MT specific declaration FR2 |
0.2.0 |
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2021-06 |
RAN#92-e |
RP-211312 |
Presented to TSG RAN for approval. (Including RF and Demod parts: R4-2108096, Big TP to TS 38.176-2 on RF part R4-2111396, Big TP draft to TS 38.176-2 Demodulation performance) |
1.0.0 |
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2021-06 |
RAN#92 |
TS was approved by RAN plenary |
16.0.0 |
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2021-09 |
RAN#93 |
RP-211892 |
0002 |
F |
Big CR for TS 38.176-2 Maintenance (Rel-16, CAT F) |
16.1.0 |
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2021-12 |
RAN#94 |
RP-212851 |
0003 |
F |
Big CR for TS 38.176-2 Maintenance (Rel-16, CAT F) |
16.2.0 |
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2022-03 |
RAN#95 |
RP-220334 |
0005 |
F |
Big CR for TS 38.176-2 Maintenance (Rel-16, CAT F) |
16.3.0 |
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Change history |
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Date |
Meeting |
TDoc |
CR |
Rev |
Cat |
Subject/Comment |
New version |
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2022-03 |
RAN#95 |
Approved by plenary – Rel-17 spec under change control |
17.0.0 |
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2022-06 |
RAN#96 |
RP-221673 |
0006 |
B |
CR to TS 38.176-2 – Introduction of licensed 6GHz band n104 |
17.1.0 |
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2022-06 |
RAN#96 |
RP-221665 |
0008 |
F |
Big CR for TS 38.176-2 Maintenance (Rel-17, CAT F) |
17.1.0 |
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2022-09 |
RAN#97 |
RP-222049 |
0013 |
B |
Big CR for TS 38.176-2 (Rel-17, CAT B) |
17.2.0 |
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