TR 38.870
Enhanced Over-the-Air (OTA) test methods for
NR FR1 Total Radiated Power (TRP) and Total Radiated Sensitivity (TRS)
V18.1.0 (Wzip)
2024/03 … p.
- Rapporteur:
- Dr. Wang, Ruixin
vivo Communication Technology
full Table of Contents for TR 38.870 Word version: 18.0.0
1 Scope
2 References
3 Definitions of terms, symbols and abbreviations
4 General
5 Performance metrics
6 UE positioning guidelines
7 Anechoic Chamber method (Reference method)
8 Reverberation Chamber test methodology
9 Testing time reduction methodologies
A UE coordinate system
B Estimation of Measurement uncertainty
C Environmental requirements
D Phantom Definition
E Harmonization outcome of Alternative method and Reference method
F Lab alignment outcome of Reference method
$ Change history
1 Scope p. 9
The present document is a technical report for enhanced Over-the-Air (OTA) test methods for NR FR1 Total Radiated Power (TRP) and Total Radiated Sensitivity (TRS), for NR standalone (SA) and NR non-standalone (NSA) operation mode.
In Rel-17, the TRP TRS OTA test method was just developed for a limited scope. This TR targets to define a full set of OTA test methods to cover different UE features for TRP and TRS measurement.
2 References p. 9
3 Definitions of terms, symbols and abbreviations p. 10
4 General p. 11
4.1 Device types p. 11
4.2 Testing configuration p. 12
4.3 Testing bands p. 12
4.3.1 General p. 12
4.3.2 Operating bands p. 12
4.3.3 Test parameters for each band p. 13
4.3.4 EN-DC band combinations p. 19
4.3.5 CA band combinations p. 21
5 Performance metrics p. 22
5.1 Definition of the Total Radiated Power (TRP) p. 22
5.1.1 Definition of the Total Radiated Power (TRP) for AC p. 22
5.1.2 Definition of the Total Radiated Power (TRP) for RC method p. 23
5.2 Definition of Total Radiated Sensitivity (TRS) p. 23
6 UE positioning guidelines p. 24
6.1 Free space p. 24
6.2 Hand phantom only (Browsing mode) p. 25
6.2.1 Wide Grip Hand p. 25
6.2.2 PDA Grip Hand p. 26
6.3 Head and Hand phantom (Talk Mode) p. 27
6.4 Head phantom only p. 28
6.5 Forearm phantom p. 28
7 Anechoic Chamber method (Reference method) p. 30
7.1 General p. 30
7.2 Test setup p. 30
7.3 Calibration procedure p. 31
7.4 TRP Test procedure p. 32
7.4.1 General p. 32
7.4.2 TRP test procedure for NR 1Tx configuration p. 32
7.4.2.1 UE configuration p. 32
7.4.2.2 Test procedure p. 32
7.4.3 TRP test procedure for NR 2Tx configuration p. 33
7.4.3.1 UE configuration p. 33
7.4.3.2 TxD TRP Test procedure p. 33
7.4.3.3 Single-layer UL-MIMO TRP Test procedure p. 33
7.4.4 TRP test procedure for NR DL CA configuration p. 34
7.4.4.1 UE configuration p. 34
7.4.4.2 Test procedure p. 34
7.5 TRS Test procedure p. 34
7.5.1 General p. 35
7.5.2 TRS test procedure for NR 1Tx configuration p. 35
7.5.2.1 UE configuration p. 35
7.5.2.2 Test Procedure p. 35
7.5.3 TRS test procedure for NR 2Tx configuration p. 35
7.5.3.1 UE configuration p. 35
7.5.3.2 Test procedure p. 36
7.5.4 TRS test procedure for NR DL CA configuration p. 36
7.5.4.1 UE configuration p. 36
7.5.4.2 Test procedure p. 36
7.6 Ripple Test for Quiet Zone p. 36
7.6.1 General p. 36
7.6.2 Ripple test procedure p. 37
7.7 Minimum Range Length p. 40
8 Reverberation Chamber test methodology p. 42
8.1 General p. 42
8.2 Test setup p. 42
8.3 Chamber Characterization p. 43
8.3.1 S-parameters and power transfer functions p. 43
8.3.2 Chamber loading for coherence bandwidth p. 43
8.3.3 Chamber spatial uniformity p. 45
8.4 Calibration procedure p. 46
8.4.1 S-parameters measurement p. 46
8.4.2 Calculation of the chamber reference transfer function p. 47
8.5 TRP Test procedure p. 48
8.6 TRS Test procedure p. 49
8.7 Test Volume p. 49
9 Testing time reduction methodologies p. 50
A UE coordinate system p. 62
B Estimation of Measurement uncertainty p. 64
B.1 General p. 64
B.2 MU contribution descriptions for Anechoic Chamber method p. 65
B.2.1 Mismatch uncertainty p. 65
B.2.1.1 Mismatch uncertainty between measurement receiver / communication tester and the measurement antenna p. 65
B.2.1.1.1 Mismatch uncertainty through the connector between two elements p. 65
B.2.1.1.2 Mismatch uncertainty due to the interaction of several elements p. 66
B.2.1.1.3 Total combined mismatch uncertainty p. 67
B.2.1.2 Mismatch uncertainty of the RF relay p. 67
B.2.1.2.1 First part: RF Relay switched on the co-polarized signal p. 68
B.2.1.2.1.1 The mismatch through the connector between two elements p. 68
B.2.1.2.1.2 Mismatch due to the interaction between two elements or more p. 68
B.2.1.2.2 Second part: RF relay switched on the cross-polarized signal p. 69
B.2.1.2.2.1 The mismatch through the connector between two elements p. 69
B.2.1.2.2.2 Mismatch due to the interaction between two elements or more p. 69
B.2.1.2.3 Total combined mismatch uncertainty p. 70
B.2.2 Insertion loss p. 70
B.2.2.1 Insertion loss of the measurement antenna cable p. 70
B.2.2.2 Insertion loss of the measurement antenna attenuator (if used) p. 70
B.2.2.3 Insertion loss of the RF relays (if used) p. 70
B.2.2.4 Insertion loss: calibration antenna feed cable p. 70
B.2.2.5 Insertion loss: calibration antenna attenuator (if used) p. 70
B.2.3 Influence of the antenna cable p. 71
B.2.4 Measurement receiver: uncertainty of the absolute level p. 71
B.2.5 Communication tester: uncertainty of the absolute level p. 71
B.2.6 Sensitivity measurement: output level step resolution p. 71
B.2.7 Measurement distance p. 71
B.2.7.1 Offset of phase centre from axis(es) of rotation p. 72
B.2.7.1.1 Offset of DUT phase centre from axis(es) of rotation p. 72
B.2.7.1.2 Offset of calibration antenna phase centre from axis(es) of rotation p. 72
B.2.7.2 Mutual coupling p. 72
B.2.7.3 Phase curvature p. 72
B.2.8 Quality of quiet zone p. 73
B.2.9 DUT Tx-power drift p. 73
B.2.10 DUT sensitivity drift p. 74
B.2.11 Uncertainty related to the use of phantoms p. 74
B.2.11.1 Uncertainty from using different types of SAM phantom p. 74
B.2.11.2 Simulated tissue liquid uncertainty p. 74
B.2.11.3 Uncertainty of dielectric properties and shape of the hand phantom p. 74
B.2.11.4 Uncertainty from using different types of Laptop Ground Plane phantom p. 76
B.2.11.5 Positioning Uncertainty from using Phantoms p. 76
B.2.11.6 Uncertainty of dielectric properties and shape of the forearm phantom p. 76
B.2.12 Coarse sampling grid p. 77
B.2.13 Random uncertainty p. 77
B.2.14 Frequency response p. 78
B.2.15 Uncertainty of network analyser p. 78
B.2.16 Uncertainty of the gain/efficiency of the calibration antenna p. 78
B.3 MU contribution descriptions for Alternative method p. 78
B.3.1 Additional Power Loss in EUT Chassis p. 78
B.3.3 Quality of Spatial Uniformity p. 79
B.3.4 Sensitivity measurement: output level step resolution p. 79
B.4 MU Assessment for TRP p. 79
B.4.1 MU Assessment for TRP in Anechoic Chamber p. 79
B.4.2 MU Assessment for TRP in Reverberation Chamber p. 83
B.5 MU Assessment for TRS p. 85
C Environmental requirements p. 94
D Phantom Definition p. 95
D.1 Head Phantom p. 95
D.2 Hand Phantom p. 95
D.2.1 PDA Grip Hand p. 95
D.2.2 Wide Grip Hand p. 95
D.3 Forearm Phantom p. 96
E Harmonization outcome of Alternative method and Reference method p. 97
F Lab alignment outcome of Reference method p. 98
F.1 General p. 98
F.2 Rel-17 lab alignment campaign (Browsing mode) p. 98
F.2.1 Framework and workplan p. 98
F.2.2 Measurement results p. 100
F.2.3 Pass/fail limit p. 101
F.2.4 Conclusions p. 101
F.3 Rel-18 lab alignment (Talk mode) p. 101
F.3.1 Framework and workplan p. 101
F.3.2 Measurement results p. 101
F.3.3 Pass/fail limit p. 101
F.3.4 Conclusions p. 101
$ Change history p. 102
