1、 ETSI TR 126 954 V15.0.0 (2018-07) LTE; Test plan for speech quality and delay through a headset electrical interface (3GPP TR 26.954 version 15.0.0 Release 15) TECHNICAL REPORT ETSI ETSI TR 126 954 V15.0.0 (2018-07)13GPP TR 26.954 version 15.0.0 Release 15Reference RTR/TSGS-0426954vf00 Keywords LTE
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13、constitute an endorsement by ETSI of products, services or organizations associated with those trademarks. 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 i
14、dentities, UMTS identities or GSM identities. 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 doc
15、ument “should“, “should not“, “may“, “need not“, “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 c
16、itation. ETSI ETSI TR 126 954 V15.0.0 (2018-07)33GPP TR 26.954 version 15.0.0 Release 15Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 4g3Introduction 4g31 Scope 5g32 References 5g33 Definitions, symbols and abbreviations . 5g33.1 Definitions 5g33.2 Symb
17、ols 5g33.3 Abbreviations . 6g34 Test Configurations 6g34.1 Setup for Terminals 6g34.2 Setup of the electrical interfaces . 7g34.2.1 Codec approach and specification. 7g34.2.2 Direct digital processing approach 8g34.3 Accuracy of test equipment 8g34.4 Test signals . 9g35 Test method for delay and spe
18、ech quality 9g35.1 Delay in sending + receiving direction using “echo“ method. 9g35.2 Speech enhancement processing in the UE and its potential impact on the determination of MOS-LQO scores 11g35.3 Speech quality loss in sending direction . 13g35.4 Speech quality loss in receiving direction 14g36 Te
19、st Scenarios 14g36.0 General . 14g36.1 Scenario 1: Impairments at the physical layer 15g36.2 Scenario 2: Impairments at the internet layer (IP impairments) . 15g36.3 Scenario 3: Operation with different modes / bit-rates (reference) 16g36.4 Scenario 4: Switching bit-rates / operating modes during a
20、call 16g36.5 Scenario 5: Codec change initiated by remote UE . 16g36.6 Scenario 6: Intra-RAT Handover . 17g36.7 Scenario 7: Inter-RAT Handover . 17g36.8 Scenario 8: Operation with DRX . 18g36.9 Scenario 9: Voice call with simultaneous data upload/download 18g3Annex A: Test Method for Interruption Ti
21、me 19g3Annex B: Change history 20g3History 21g3ETSI ETSI TR 126 954 V15.0.0 (2018-07)43GPP TR 26.954 version 15.0.0 Release 15Foreword This Technical Report has been produced by the 3rd Generation Partnership Project (3GPP). The contents of the present document are subject to continuing work within
22、the TSG and may change following formal TSG approval. Should the TSG modify the contents of the present document, 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
23、information; 2 presented to TSG for approval; 3 or greater indicates TSG approved document under change control. 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 b
24、een incorporated in the document. Introduction Testing of speech transmission quality and delay through the UE headset electrical interface is a common practice in the industry for troubleshooting and benchmarking of network and UE performance. The UE headset electrical interface provides a convenie
25、nt access point for testing that removes acoustic interface related aspects from the measurement. Test equipment (TE) solutions designed to connect to the UE headset electrical interface are commercially available and target both “drive-test“ as well as lab environment testing applications. However,
26、 the lack of a standardized test methodology causes difficulties in interpreting results between different TEs, leading to possibly misleading conclusions on both network and UE performance. The present document attempts to address this problem by providing a unified test procedure methodology. ETSI
27、 ETSI TR 126 954 V15.0.0 (2018-07)53GPP TR 26.954 version 15.0.0 Release 151 Scope The present document provides guidance on testing of speech quality and delay through a UE headset electrical interface, including both analog and digital headset interfaces. The present document includes test set-up
28、configurations, measurement scenarios and an indication of a range of results that can be expected in measurements. It is envisioned that the present document will serve as a reference for UE vendors and Mobile Network Operators wishing to conduct such tests. 2 References The following documents con
29、tain provisions which, through reference 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
30、-specific reference, the latest version 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 Specificati
31、ons“. 2 3GPP TS 26.445: “Codec for Enhanced Voice Services (EVS); Detailed algorithmic description“. 3 IEC Publication 61672-1 (2013): “Sound Level Meters - Part 1: Specifications“. 4 ITU-T Recommendation P.501 (01/2012): “Test signals for use in telephonometry“. 5 ITU-T Recommendation P.56 (12/2011
32、): “Objective measurement of active speech level“. 6 3GPP TS 26.131: “Terminal acoustic characteristics for telephony; Requirements“. 7 3GPP TS 26.132: “Speech and video telephony terminal acoustic test specification“. 8 ITU-T Recommendation P.381 (07/2016): “Technical requirements and test methods
33、for the universal wired headset or headphone interface of digital mobile terminals“. 9 ITU-T Recommendation P.863 (09/2014): “Perceptual objective listening quality assessment“. 10 ITU-T Recommendation P.501 Amendment 3 (06/2015): “New Annex D Speech files with male/female sentences prepared for use
34、 with perceptual based objective speech quality prediction“. 11 3GPP TS 36.101: “Evolved Universal Terrestrial Radio Access (E-UTRA); User Equipment (UE) radio transmission and reception.“ 3 Definitions, symbols and abbreviations 3.1 Definitions For the purposes of the present document, the terms an
35、d definitions given in 3GPP TR 21.905 1 and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in 3GPP TR 21.905 1. 3.2 Symbols For the purposes of the present document, the following symbols apply: Ohms ETSI ETSI TR 126 954 V15
36、.0.0 (2018-07)63GPP TR 26.954 version 15.0.0 Release 153.3 Abbreviations For the purposes of the present document, the abbreviations given in 3GPP TR 21.905 1 and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if an
37、y, in 3GPP TR 21.905 1. EVS Enhanced Voice Services JBM Jitter Buffer Management MOS-LQO Mean Opinion Score Listening Quality Objective MTSI Multimedia Telephony Service for IMS SPS Semi-Persistent Scheduling SRVCC Single Radio Voice Call Continuity 4 Test Configurations 4.1 Setup for Terminals The
38、general test setup configuration and access to the UE is described in Figure 1: Figure 1: Test Configuration for headset electrical interface NOTE 1: The nominal Send test signal level is -60dBV. If other send test signal levels are used they will be stated in the test report. The preferred way of t
39、esting is the connection of a UE to the system simulator with exact defined settings and access points. The test sequences are fed in either electrically using a reference codec or using the direct signal processing approach. The system simulator should simulate the access network and core network i
40、ncluding the speech encoding/decoding specified for the test (e.g. AMR, AMR-WB or EVS) but excluding further transcoding beyond linear PCM, see Figure 1. The output of the test system connected to the interface in Send of the headset connector has to be DC resistant. The output impedance should be b
41、etween 1 kg525 and 10 kg525. Care should be taken that the output impedance triggers the UE headset microphone detection. The dynamic range of the test equipment should be consistent with (or exceed) the dynamic range provided by headset microphones. The input of the test system connected to the rec
42、eiving interfaces of the headset connectors should have an input impedance greater than 1 kg525. The dynamic range of the test equipment should be consistent with (or exceed) the dynamic range provided by the UE headset electrical interface output. ETSI ETSI TR 126 954 V15.0.0 (2018-07)73GPP TR 26.9
43、54 version 15.0.0 Release 15An optional 32 g525 load may be used in order to condition the UE with a realistic echo situation and/or to provide a well-defined volume control setting. If the optional 32 g525 load is used, the common ground impedance for the test system (between sending and receiving
44、sides and including the cable used to connect the test equipment to the UE headset electrical interface) should be g148 50 mg525. NOTE 2: A common ground impedance g148 50 mg525 provides a crosstalk attenuation greater than 56 dB between the UE output and input headset electrical interface when usin
45、g a 32 g525 load. Unless specified otherwise for the respective test, the radio conditions on the air interface will have a block error rate of 0 % and the jitter in the IP transport for MTSI-based speech will be g148 1 ms. In case of MTSI-based speech, the reference client will allow to synchronize
46、 to the clock of the device under test and include a de-jitter buffer to equalize possible jitter in the signal received from the UE. When operating with synchronized clock, the de-jitter buffer will be a static de-jitter buffer and the jitter buffer management will not compensate for clock drift. T
47、he reference client will not lose or discard packets, will not trigger retransmission, and will not use error concealment or time-warping. The initial jitter buffer size (filling level) will be higher than the maximum expected network jitter and the maximum jitter buffer size will be at least twice
48、the initial size. During jitter buffer reset, the de-jitter buffer will be emptied/filled to the initial buffer size. In case of buffer over- or underruns, the reference client will give a warning and it will be reported. NOTE 3: A static de-jitter buffer is a first-in-first-out (FIFO) buffer which
49、at the beginning buffers packets until a given initial buffer size is reached. Due to changing network delays the filling level of the de-jitter buffer can change, but the sum of network delay and jitter buffer delay is constant (as opposed to an adaptive jitter buffer management). The filling level of the de-jitter buffer represents the de-jitter buffer delay. For measurements with unsynchronized clock e.g. the measurement of clock drift, jitter buffer over- and underruns cannot be avoided due to the unsynchronized clocks. Under the assumpt
