H.7 EVM
38.176-13GPPIntegrated Access and Backhaul (IAB) conformance testingNRPart 1: conducted conformance testingRelease 17TS
H.7.0 General
For EVM create two sets of , according to the timing and , using the equalizer coefficients from H.6.
The equivalent ideal samples are calculated from (annex H.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.
H.7.1 Averaged EVM (TDD)
EVM is averaged over all allocated uplink resource blocks with the considered modulation scheme in the frequency domain, and a minimum of slots where is the number of slots in a 10 ms measurement interval.
For TDD, let be the number of slots with uplink symbols within a 10 ms measurement interval, 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 15 kHz SCS, for 30 kHz SCS and for 60 kHz SCS normal CP.
– Unite by RMS.
Annex I (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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04/2021 |
RAN4#98bis-e |
R4-2106058 |
IAB conducted conformance specification skeleton |
0.0.1 |
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05/2021 |
RAN4#99-e |
R4-2111397 |
Update of IAB conducted conformance TS with agreed TP in RAN4#98bis-e: R4-2106050 TP for Annex E for conducted IAB test specification R4-2106054 TP to TS38.176-1 on subclause 4.10 -5 R4-2106131 TP to TS 38.176-1 -Clause 4.1 R4-2106059 TP to TS 38.176-1 – Annex D R4-2106056 TP to TS 38.xxx-1: Section 4.2~4.5 R4-2106062 TP for TS 38.176-1: Transmit ON/OFF power R4-2106064 TP to TS 38.176-1: Output power and Unwanted emission R4-2106065 TP to TS 38.xxx-1: TX IMD requirements R4-2106066 TP to TS 38.176-1 Annex A for IAB conducted test specification R4-2106069 TP toTS 38.176-1 – Sensitivity, clause 7.2 R4-2106070 TP to TS 38.176-1 – Rx dynamic range, clause 7.3 R4-2106071 TP for IBB, OBB and RX spurious of conducted receiver test R4-2106067 TP to TS 38.xxx-1: RX IMD requirements R4-2106068 TP to TS 38.xxx-1: RX ICS requirements R4-2106072 TP to TS 38.176-1 Clause 4.6 Declarations for IAB conducted test specification |
0.1.0 |
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05/2021 |
RAN4#99-e |
R4-2108095 |
Update of IAB conducted conformance TS with agreed TP in RAN4#99-e: R4-2111399 TP to TS 38.176-1 -Clean up R4-2108565 TP to TS 38.176-1 on test efficiency clause 4.13 R4-2108569 TP for TS 38.176-1: Test configurations and applicability of requirements R4-2108567 TP to TS 38.176-1: IAB Common test issue on test model-Conducted R4-2108571 TP for TS 38.176-1: Annex B and C R4-2108573 TP to TS 38.176-1 -Clause 4.1 R4-2111397 TS 38.176-1 -Updated TS 37.176-1 R4-2111399 TP to TS 38.176-1 -Clean up R4-2108710 TP for TS 38.176-1: Transmitted signal quality R4-2108087 TP to TS 38.176-1 – OTA Tx dynamic range, clause 6.3 R4-2111177 TP for IBB, OBB and RX spurious of conducted receiver test R4-2111405 TP to TS 38.176-1 – Sensitivity, clause 7.2 R4-2108576 TP to TS 38.176-1 Clause 4.6 Declarations for IAB conducted test specification R4-2108577 TP to TS 38.176-1: Annex G and H: In-channel TX test |
0.2.0 |
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06/2021 |
RAN#92-e |
RP-211342 |
Presented to TSG RAN for approval. (Including RF and Demod parts: R4-2108095 Big TP to TS 38.176-1 on RF part R4-2109211 Big TP to TS 38.176-1: IAB demodulation performance requirement) |
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 38.176-1 Maintenance (Rel-16, CAT F) |
16.1.0 |
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2021-12 |
RAN#94 |
RP-212851 |
0003 |
F |
Big CR for TS 38.176-1 Maintenance (Rel-16, CAT F) |
16.2.0 |
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2022-03 |
RAN#95 |
RP-220334 |
0004 |
F |
Big CR for TS 38.176-1 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 |
0005 |
B |
CR to TR 38.176-1 on introduction of 6GHz licensed band |
17.1.0 |
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2022-06 |
RAN#96 |
RP-221665 |
0007 |
F |
Big CR for TS 38.176-1 Maintenance (Rel-17, CAT F) |
17.1.0 |
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2022-09 |
RAN#97 |
RP-222049 |
0011 |
B |
Big CR for TS 38.176-1 (Rel-17, CAT B) |
17.2.0 |
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