1、 ETSI TR 1Evolved Universal Tand EvolvRadio AccDerivation of test toradio rece(3GPP TR 36.9floppy3TECHNICAL REPORT 136 904 V13.0.0 (2017LTE; l Terrestrial Radio Access (E-ed Universal Terrestrial ccess Network (E-UTRAN); tolerances for User Equipmenception conformance tests .904 version 13.0.0 Relea
2、se 1317-01) UTRA) ent (UE) 13) ETSI ETSI TR 136 904 V13.0.0 (2017-01)13GPP TR 36.904 version 13.0.0 Release 13Reference RTR/TSGR-0536904vd00 Keywords LTE ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16 Siret N 348 623 562 00017 - NAF
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12、or may be, or may become, essential to the present document. Foreword This Technical Report (TR) has been produced by ETSI 3rd Generation Partnership Project (3GPP). The present document may refer to technical specifications or reports using their 3GPP identities, UMTS identities or GSM identities.
13、These should be interpreted as being references to the corresponding ETSI deliverables. The cross reference between GSM, UMTS, 3GPP and ETSI identities can be found under http:/webapp.etsi.org/key/queryform.asp. Modal verbs terminology In the present document “should“, “should not“, “may“, “need not
14、“, “will“, “will not“, “can“ and “cannot“ are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of provisions). “must“ and “must not“ are NOT allowed in ETSI deliverables except when used in direct citation. ETSI ETSI TR 136 904 V13.0.0 (2017-01
15、)33GPP TR 36.904 version 13.0.0 Release 13Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 4g3Introduction 4g31 Scope 5g32 References 5g33 Definitions, symbols and abbreviations . 5g33.1 Definitions 5g33.2 Symbols 5g33.3 Abbreviations . 5g34 General Princi
16、ples 6g34.1 Principle of Superposition 6g34.2 Sensitivity analysis . 6g34.3 Statistical combination of uncertainties 6g34.4 Correlation between uncertainties 7g34.4.1 Uncorrelated uncertainties 7g34.4.2 Positively correlated uncertainties 7g34.4.3 Negatively correlated uncertainties . 8g34.4.4 Treat
17、ment of uncorrelated uncertainties . 9g34.4.5 Treatment of positively correlated uncertainties with adverse effect 9g34.4.6 Treatment of positively correlated uncertainties with beneficial effect 9g34.4.7 Treatment of negatively correlated uncertainties 9g35 Grouping of test cases defined in TS 36.5
18、21-1 9g36 Determination of Test System Uncertainties 10g36.1 General . 10g36.2 Uncertainty figures . 11g37 Determination of Test Tolerances 11g37.1 General . 11g3Annex A: Derivation documents 12g3Annex B: Change History 13g3History 15g3ETSI ETSI TR 136 904 V13.0.0 (2017-01)43GPP TR 36.904 version 13
19、.0.0 Release 13Foreword This Technical Report has been produced by the 3rdGeneration Partnership Project (3GPP). The contents of the present document are subject to continuing work within the TSG and may change following formal TSG approval. Should the TSG modify the contents of the present document
20、, it will be re-released by the TSG with an identifying change of release date and an increase in version number as follows: Version x.y.z where: x the first digit: 1 presented to TSG for information; 2 presented to TSG for approval; 3 or greater indicates TSG approved document under change control.
21、 y the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections, updates, etc. z the third digit is incremented when editorial only changes have been incorporated in the document. Introduction ETSI ETSI TR 136 904 V13.0.0 (2017-01)53GPP TR 36.904 version 13.
22、0.0 Release 131 Scope The present document specifies a general method used to derive Test Tolerances for UE radio reception conformance tests in 3GPP TS 36.521-1 2, and establishes a system for relating the Test Tolerances to the measurement uncertainties of the Test System. The test cases which hav
23、e been analysed to determine Test Tolerances are included as .zip files. The present document is applicable from Release 10 up to the release indicated on the front page of the present Terminal conformance specifications. 2 References The following documents contain provisions which, through referen
24、ce in this text, constitute provisions of the present document. - References are either specific (identified by date of publication, edition number, version number, etc.) or non-specific. - For a specific reference, subsequent revisions do not apply. - For a non-specific reference, the latest versio
25、n applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document. 1 3GPP TR 21.905: “Vocabulary for 3GPP Specifications“. 2 3GPP TS 36.521-1: “User Equipm
26、ent (UE) conformance specification, Radio transmission and reception Part 1: conformance testing“. 3 ETSI ETR 273-1-2: “Improvement of radiated methods of measurement (using test sites) and evaluation of the corresponding measurement uncertainties; Part 1: Uncertainties in the measurement of mobile
27、radio equipment characteristics; Sub-part 2: Examples and annexes“. 3 Definitions, symbols and abbreviations 3.1 Definitions For the purposes of the present document, the terms and definitions given in TR 21.905 1 and the following apply. A term defined in the present document takes precedence over
28、the definition of the same term, if any, in TR 21.905 1. Other definitions used in the present document are listed in 3GPP TS 36.521-1 2. 3.2 Symbols Symbols used in the present document are listed in 3GPP TR 21.905 1, 3GPP TS 36.521-1 2. 3.3 Abbreviations For the purposes of the present document, t
29、he abbreviations given in TR 21.905 1 apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905 1. Other abbreviations used in the present document are listed in 3GPP TS 36.521-1 2. ETSI ETSI TR 136 904 V13.0.0 (2017-01
30、)63GPP TR 36.904 version 13.0.0 Release 134 General Principles 4.1 Principle of Superposition For multi-cell tests there are several cells each generating various Physical channels. In general cells are combined along with AWGN, so the signal and noise seen by the UE may be determined by more than o
31、ne cell. Since several cells may contribute towards the overall power applied to the UE, a number of test system uncertainties affect the signal and noise seen by the UE. The aim of the superposition method is to vary each controllable parameter of the test system separately, and to establish its ef
32、fect on the critical parameters as seen by the UE receiver. The superposition principle then allows the effect of each test system uncertainty to be added, to calculate the overall effect. The contributing test system uncertainties shall form a minimum set for the superposition principle to be appli
33、cable. 4.2 Sensitivity analysis A change in any one channel level or channel ratio generated at source does not necessarily have a 1:1 effect at the UE. The effect of each controllable parameter of the test system on the critical parameters as seen by the UE receiver shall therefore be established.
34、As a consequence of the sensitivity scaling factors not necessarily being unity, the test system uncertainties cannot be directly applied as test tolerances to the critical parameters as seen by the UE. EXAMPLE: In many of the tests described, the s / Iotis one of the critical parameters at the UE.
35、Scaling factors are used to model the sensitivity of the s / Iotto each test system uncertainty. When the scaling factors have been determined, the superposition principle then allows the effect of each test system uncertainty to be added, to give the overall variability in the critical parameters a
36、s seen at the UE. There are often constraints on several parameters at the UE. The aim of the sensitivity analysis, together with the acceptable test system uncertainties, is to ensure that the variability in each of these parameters is controlled within the limits necessary for the specification to
37、 apply. The test has then been conducted under valid conditions. 4.3 Statistical combination of uncertainties The acceptable uncertainties of the test system are specified as the measurement uncertainty tolerance interval for a specific measurement that contains 95% of the performance of a populatio
38、n of test equipment, in accordance with 3GPP TS 36.521-1 2 clause F.1. In the UE radio reception conformance tests covered by the present document, the Test System shall enable the stimulus signals in the test case to be adjusted to within the specified range, with an uncertainty not exceeding the s
39、pecified values. The method given in the present document combines the acceptable uncertainties of the test system, to give the overall variability in the critical parameters as seen at the UE. Since the process does not add any new uncertainties, the method of combination should be chosen to mainta
40、in the same tolerance interval for the combined uncertainty as is already specified for the contributing test system uncertainties. The basic principle for combining uncertainties is in accordance with ETR 273-1-2 3. In summary, the process requires 3 steps: a) Express the value of each contributing
41、 uncertainty as a one standard deviation figure, from knowledge of its numeric value and its distribution. b) Combine all the one standard deviation figures as root-sum-squares, to give the one standard deviation value for the combined uncertainty. c) Expand the combined uncertainty by a coverage fa
42、ctor, according to the tolerance interval required. Provided that the contributing uncertainties have already been obtained using this method, using a coverage factor of 2, further stages of combination can be achieved by performing step b) alone, since steps a) and c) simply divide by 2 and multipl
43、y by 2 respectively. ETSI ETSI TR 136 904 V13.0.0 (2017-01)73GPP TR 36.904 version 13.0.0 Release 13The root-sum-squares method is therefore used to maintain the same tolerance interval for the combined uncertainty as is already specified for the contributing test system uncertainties. In some cases
44、 where correlation between contributing uncertainties has an adverse effect, the method is modified in accordance with clause 4.4.5 of the present document. In each analysis, the uncertainties are assumed to be uncorrelated, and are added result root-sum-square unless otherwise stated. The combinati
45、on of uncertainties is performed using dB values for simplicity. It has been shown that using dB uncertainty values gives a slightly worse combined uncertainty result than using linear values for the uncertainties. The analysis method therefore errs on the safe side. 4.4 Correlation between uncertai
46、nties The statistical (root-sum-square) addition of uncertainties is based on the assumption that the uncertainties are independent of each other. For realisable test systems, the uncertainties may not be fully independent. The validity of the method used to add uncertainties depends on both the typ
47、e of correlation and on the way in which the uncertainties affect the test requirements. Clauses 4.4.1 to 4.4.3 give examples to illustrate different types of correlation. Clauses 4.4.4 to 4.4.7 show how the scenarios applicable to multi-cell RRM tests are treated. 4.4.1 Uncorrelated uncertainties T
48、he graph shows an example of two test system uncertainties, A and B, which affect a test requirement. Each sample from a population of test systems has a specific value of error in parameter A, and a specific value of error in parameter B. Each dot on the graph represents a sample from a population
49、of test systems, and is plotted according to its error values for parameters A and B. Error inparameter AError inparameter BFigure 4.4.1.1: Example of two test system uncertainties affecting a test requirement It can be seen that a positive value of error in parameter A, for example, is equally likely to occur with either a positive or a negative value of error in parameter B. This is expected when two parameters are uncorrelated, such as two uncertainties which arise from different and unrelated parts of the test system. 4.4.2 Positively correla
