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TR 38.870
Enhanced Over-the-Air (OTA) test methods for
NR FR1 Total Radiated Power (TRP) and Total Radiated Sensitivity (TRS)

3GPP‑Page
V19.3.0 (Wzip)  2025/12  … p.
V18.5.0  2025/06  114 p.
Rapporteur:
Dr. Wang, Ruixin
vivo Communication Technology

full Table of Contents for  TR 38.870  Word version:  19.1.0

1Scope  p. 9
2References  p. 9
3Definitions of terms, symbols and abbreviations  p. 11
3.1Terms  p. 11
3.2Symbols  p. 11
3.3Abbreviations  p. 11
4General  p. 12
4.1Device types  p. 12
4.2Testing configuration  p. 13
4.2.1UE use scenarios for TRP TRS test  p. 13
4.2.2UE mechanical mode description  p. 13
4.3Testing bands  p. 13
4.3.1General  p. 13
4.3.2Operating bands  p. 14
4.3.3Test parameters for each band  p. 14
4.3.4EN-DC band combinations  p. 22
4.3.5CA band combinations  p. 24
4.3.6Alternative parameters related to channel bandwidth and bands  p. 25
4.3.6.1General  p. 25
4.3.6.2Test parameters  p. 25
4.3.6.3TRS requirements for additional channel bandwidths  p. 26
5Performance metrics  p. 26
5.1Definition of the Total Radiated Power (TRP)  p. 26
5.1.1Definition of the Total Radiated Power (TRP) for AC  p. 26
5.1.1.1Applicability of TRP metrics  p. 26
5.1.1.2TRP for UEs supporting single-port transmission  p. 26
5.1.1.3TRP for UEs supporting non-coherent UL MIMO  p. 27
5.1.1.4TRP for UEs supporting coherent UL MIMO  p. 28
5.1.2Definition of the Total Radiated Power (TRP) for RC method  p. 28
5.2Definition of Total Radiated Sensitivity (TRS)  p. 29
5.2.1Definition of the Total Radiated Sensitivity (TRS) for AC  p. 29
5.2.2Definition of the Total Radiated Sensitivity (TRS) for RC method  p. 30
6UE positioning guidelines  p. 30
6.1Free space  p. 30
6.2Hand phantom only (Browsing mode)  p. 30
6.2.1Wide Grip Hand  p. 31
6.2.2PDA Grip Hand  p. 31
6.3Head and Hand phantom (Talk Mode)  p. 32
6.3.1General  p. 32
6.3.2Wide Grip Hand and Head  p. 34
6.3.3PDA Grip Hand and Head  p. 34
6.4Head phantom only  p. 34
6.5Forearm phantom  p. 34
6.5.1Forearm Phantom placement in the chamber  p. 34
6.5.2Wrist-Worn RedCap Device mounted on the Forearm Phantom  p. 34
7Anechoic Chamber method (Reference method)  p. 36
7.1General  p. 36
7.2Test setup  p. 36
7.2.1General Test system  p. 36
7.2.2Test equipment configuration  p. 37
7.2.2.1Spectrum analyser  p. 37
7.3Calibration procedure  p. 37
7.4TRP Test procedure  p. 38
7.4.1General  p. 38
7.4.2TRP test procedure for NR 1Tx configuration  p. 38
7.4.2.1UE configuration  p. 38
7.4.2.2Test procedure  p. 38
7.4.3TRP test procedure for NR 2Tx configuration  p. 39
7.4.3.1UE configuration  p. 39
7.4.3.2TxD TRP Test procedure  p. 39
7.4.3.3Single-layer UL-MIMO TRP Test procedure  p. 39
7.4.4TRP test procedure for NR DL CA configuration  p. 40
7.4.4.1UE configuration  p. 40
7.4.4.2Test procedure  p. 40
7.5TRS Test procedure  p. 41
7.5.1General  p. 41
7.5.2TRS test procedure for NR 1Tx configuration  p. 41
7.5.2.1UE configuration  p. 41
7.5.2.2Test Procedure  p. 41
7.5.3TRS test procedure for NR 2Tx configuration  p. 42
7.5.3.1UE configuration  p. 42
7.5.3.2Test procedure  p. 42
7.5.4TRS test procedure for NR DL CA configuration  p. 42
7.5.4.1UE configuration  p. 42
7.5.4.2Test procedure  p. 42
7.6Ripple Test for Quiet Zone  p. 42
7.6.1General  p. 42
7.6.2Ripple test procedure  p. 43
7.7Minimum Range Length  p. 46
8Reverberation Chamber test methodology  p. 48
8.1General  p. 48
8.2Test setup  p. 48
8.3Chamber Characterization  p. 49
8.3.1S-parameters and power transfer functions  p. 49
8.3.2Chamber loading for coherence bandwidth  p. 49
8.3.2.1Coherence bandwidth calculation  p. 49
8.3.3Chamber spatial uniformity  p. 50
8.4Calibration procedure  p. 52
8.4.1S-parameters measurement  p. 52
8.4.2Calculation of the chamber reference transfer function  p. 53
8.5TRP Test procedure  p. 53
8.5.1TRP for SA and EN-DC  p. 53
8.5.1.1Test conditions  p. 53
8.5.1.2UE configurations  p. 53
8.5.1.3Test procedure  p. 53
8.6TRS Test procedure  p. 54
8.6.1TRS for SA and EN-DC  p. 54
8.6.1.1Test conditions  p. 54
8.6.1.2UE configurations  p. 54
8.6.1.3Test procedure  p. 54
8.7Test Volume  p. 54
9Testing time reduction methodologies  p. 55
9.1General  p. 55
9.2Measurement grids for Anechoic Chamber method  p. 55
9.3Other solutions  p. 67
9.3.1Spiral Scan procedure for TRP Test  p. 67
10Alternative methodologies to resolve battery issue  p. 67
10.1General  p. 67
10.2Alternate TRS Test procedure Using Low UL Power  p. 67
10.3TRP/TRS OTA test based on averaging multiple split measurement grids  p. 68
AUE coordinate system  p. 70
A.1Reference coordinate system  p. 70
BEstimation of Measurement uncertainty  p. 72
B.1General  p. 72
B.2MU contribution descriptions for Anechoic Chamber method  p. 73
B.2.1Mismatch uncertainty  p. 73
B.2.1.1Mismatch uncertainty between measurement receiver / communication tester and the measurement antenna  p. 73
B.2.1.1.1Mismatch uncertainty through the connector between two elements  p. 73
B.2.1.1.2Mismatch uncertainty due to the interaction of several elements  p. 74
B.2.1.1.3Total combined mismatch uncertainty  p. 75
B.2.1.2Mismatch uncertainty of the RF relay  p. 75
B.2.1.2.1First part: RF Relay switched on the co-polarized signal  p. 76
B.2.1.2.1.1The mismatch through the connector between two elements  p. 76
B.2.1.2.1.2Mismatch due to the interaction between two elements or more  p. 76
B.2.1.2.2Second part: RF relay switched on the cross-polarized signal  p. 77
B.2.1.2.2.1The mismatch through the connector between two elements  p. 77
B.2.1.2.2.2Mismatch due to the interaction between two elements or more  p. 77
B.2.1.2.3Total combined mismatch uncertainty  p. 78
B.2.2Insertion loss  p. 78
B.2.2.1Insertion loss of the measurement antenna cable  p. 78
B.2.2.2Insertion loss of the measurement antenna attenuator (if used)  p. 78
B.2.2.3Insertion loss of the RF relays (if used)  p. 78
B.2.2.4Insertion loss: calibration antenna feed cable  p. 78
B.2.2.5Insertion loss: calibration antenna attenuator (if used)  p. 78
B.2.3Influence of the antenna cable  p. 79
B.2.3.1Measurement antenna cable  p. 79
B.2.3.2Calibration antenna cable  p. 79
B.2.4Measurement receiver: uncertainty of the absolute level  p. 79
B.2.5Communication tester: uncertainty of the absolute level  p. 79
B.2.6Sensitivity measurement: output level step resolution  p. 79
B.2.7Measurement distance  p. 80
B.2.7.1Offset of phase centre from axis(es) of rotation  p. 80
B.2.7.1.1Offset of DUT phase centre from axis(es) of rotation  p. 80
B.2.7.1.2Offset of calibration antenna phase centre from axis(es) of rotation  p. 80
B.2.7.2Mutual coupling  p. 80
B.2.7.3Phase curvature  p. 81
B.2.8Quality of quiet zone  p. 81
B.2.9DUT Tx-power drift  p. 81
B.2.10DUT sensitivity drift  p. 82
B.2.11Uncertainty related to the use of phantoms  p. 82
B.2.11.1Uncertainty from using different types of SAM phantom  p. 82
B.2.11.2Simulated tissue liquid uncertainty  p. 82
B.2.11.3Uncertainty of dielectric properties and shape of the hand phantom  p. 83
B.2.11.4Uncertainty from using different types of Laptop Ground Plane phantom  p. 84
B.2.11.5Positioning Uncertainty from using Phantoms  p. 84
B.2.11.6Uncertainty of dielectric properties and shape of the forearm phantom  p. 85
B.2.12Coarse sampling grid  p. 85
B.2.13Random uncertainty  p. 86
B.2.14Frequency response  p. 86
B.2.15Uncertainty of network analyser  p. 86
B.2.16Uncertainty of the gain/efficiency of the calibration antenna  p. 86
B.3MU contribution descriptions for Alternative method  p. 86
B.3.1Additional Power Loss in EUT Chassis  p. 87
B.3.3Quality of Spatial Uniformity  p. 87
B.3.4Sensitivity measurement: output level step resolution  p. 87
B.4MU Assessment for TRP  p. 87
B.4.1MU Assessment for TRP in Anechoic Chamber  p. 87
B.4.2MU Assessment for TRP in Reverberation Chamber  p. 91
B.5MU Assessment for TRS  p. 94
B.5.1MU Assessment for TRS in Anechoic Chamber  p. 94
B.5.2MU Assessment for TRS in Reverberation Chamber  p. 98
CEnvironmental requirements  p. 102
C.1Scope  p. 102
C.2Ambient temperature  p. 102
C.3Operating voltage  p. 102
DPhantom Definition  p. 103
D.1Head Phantom  p. 103
D.2Hand Phantom  p. 103
D.2.1PDA Grip Hand  p. 103
D.2.2Wide Grip Hand  p. 103
D.3Forearm Phantom  p. 104
D.4Head Phantom for head-mounted devices  p. 104
EHarmonization outcome of Alternative method and Reference method  p. 105
E.1General  p. 105
E.2Rel-18 Harmonization activity  p. 105
E.2.1Framework and workplan  p. 105
E.2.2Measurement results  p. 106
E.2.3Pass/fail limit  p. 110
E.2.4Conclusions  p. 111
FLab alignment outcome of Reference method  p. 112
F.1General  p. 112
F.2Rel-17 lab alignment campaign (Browsing mode)  p. 112
F.2.1Framework and workplan  p. 112
F.2.2Measurement results  p. 114
F.2.3Pass/fail limit  p. 115
F.2.4Conclusions  p. 115
F.3Rel-18 lab alignment (Talk mode)  p. 115
F.3.1Framework and workplan  p. 115
F.3.2Measurement results  p. 117
F.3.3Pass/fail limit  p. 117
F.3.4Conclusions  p. 118
$Change history  p. 119

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