1、 ETSI TR 126 954 V14.0.0 (2017-07) LTE; Test plan for speech quality and delay through a headset electrical interface (3GPP TR 26.954 version 14.0.0 Release 14) TECHNICAL REPORT ETSI ETSI TR 126 954 V14.0.0 (2017-07)13GPP TR 26.954 version 14.0.0 Release 14Reference DTR/TSGS-0426954ve00 Keywords LTE
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7、rization of ETSI. The copyright and the foregoing restriction extend to reproduction in all media. ETSI 2017. All rights reserved. DECTTM, PLUGTESTSTM, UMTSTMand the ETSI logo are Trade Marks of ETSI registered for the benefit of its Members. 3GPPTM and LTE are Trade Marks of ETSI registered for the
8、 benefit of its Members and of the 3GPP Organizational Partners. oneM2M logo is protected for the benefit of its Members GSM and the GSM logo are Trade Marks registered and owned by the GSM Association. ETSI ETSI TR 126 954 V14.0.0 (2017-07)23GPP TR 26.954 version 14.0.0 Release 14Intellectual Prope
9、rty Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found in ETSI SR 000 314: “Intellectual Property Rights (IPRs); Es
10、sential, or potentially Essential, IPRs notified to ETSI in respect of ETSI standards“, which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (https:/ipr.etsi.org/). Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carrie
11、d out by ETSI. No guarantee can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become, essential to the present document. Foreword This Technical Report (TR) has been produced by ETSI 3rd Generation Pa
12、rtnership Project (3GPP). The present document may refer to technical specifications or reports using their 3GPP identities, 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
13、 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“, “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
14、expression of provisions). “must“ and “must not“ are NOT allowed in ETSI deliverables except when used in direct citation. ETSI ETSI TR 126 954 V14.0.0 (2017-07)33GPP TR 26.954 version 14.0.0 Release 14Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 4g3In
15、troduction 4g31 Scope 5g32 References 5g33 Definitions, symbols and abbreviations . 5g33.1 Definitions 5g33.2 Symbols 6g33.3 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 digi
16、tal processing approach 8g34.3 Accuracy of test equipment 9g34.4 Test signals . 9g35 Test method for delay and speech quality 10g35.1 Delay in sending + receiving direction using “echo“ method. 10g35.2 Speech enhancement processing in the UE and its potential impact on the determination of MOS-LQO s
17、cores 11g35.3 Speech quality loss in sending direction . 13g35.4 Speech quality loss in receiving direction 14g36 Test Scenarios 15g36.0 General . 15g36.1 Scenario 1: Impairments at the physical layer 15g36.2 Scenario 2: Impairments at the internet layer (IP impairments) . 16g36.3 Scenario 3: Operat
18、ion with different modes / bit-rates (reference) 16g36.4 Scenario 4: Switching bit-rates / operating modes during a call 17g36.5 Scenario 5: Codec change initiated by remote UE . 17g36.6 Scenario 6: Intra-RAT Handover . 18g36.7 Scenario 7: Inter-RAT Handover . 18g36.8 Scenario 8: Operation with DRX
19、. 18g36.9 Scenario 9: Voice call with simultaneous data upload/download 19g3Annex A: Test Method for Interruption Time 20g3Annex B: Change history 21g3History 22g3ETSI ETSI TR 126 954 V14.0.0 (2017-07)43GPP TR 26.954 version 14.0.0 Release 14Foreword This Technical Report has been produced by the 3r
20、d Generation 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, it will be re-released by the TSG with an identifying change of releas
21、e 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. y the second digit is incremented for all changes of substance, i.e. te
22、chnical enhancements, corrections, updates, etc. z the third digit is incremented when editorial only changes have been 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 tro
23、ubleshooting and benchmarking of network and UE performance. The UE headset electrical interface provides a convenient 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 interfa
24、ce are commercially available and target both “drive-test“ as well as lab environment testing applications. However, 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 perfor
25、mance. The present document attempts to address this problem by providing a unified test procedure methodology. ETSI ETSI TR 126 954 V14.0.0 (2017-07)53GPP TR 26.954 version 14.0.0 Release 141 Scope The present document provides guidance on testing of speech quality and delay through a UE headset el
26、ectrical interface, including both analog and digital headset interfaces. The present document includes test set-up 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
27、 for UE vendors and Mobile Network Operators wishing to conduct such tests. 2 References The following documents contain provisions which, through reference in this text, constitute provisions of the present document. - References are either specific (identified by date of publication, edition numbe
28、r, version number, etc.) or non-specific. - For a specific reference, subsequent revisions do not apply. - For a non-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 vers
29、ion of that document in the same Release as the present document. 1 3GPP TR 21.905: “Vocabulary for 3GPP Specifications“. 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
30、ITU-T Recommendation P.501 (01/2012): “Test signals for use in telephonometry“. 5 ITU-T Recommendation P.56 (12/2011): “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 term
31、inal acoustic test specification“. 8 ITU-T Recommendation P.381 (07/2016): “Technical requirements and test methods 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
32、-T Recommendation P.501 Amendment 3 (06/2015): “New Annex D Speech files with male/female sentences prepared for use 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 recepti
33、on.“ 3 Definitions, symbols and abbreviations 3.1 Definitions For the purposes of the present document, the terms and 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
34、 1. ETSI ETSI TR 126 954 V14.0.0 (2017-07)63GPP TR 26.954 version 14.0.0 Release 143.2 Symbols For the purposes of the present document, the following symbols apply: Ohms 3.3 Abbreviations For the purposes of the present document, the abbreviations given in 3GPP TR 21.905 1 and the following apply.
35、An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, 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 Se
36、mi-Persistent Scheduling SRVCC Single Radio Voice Call Continuity 4 Test Configurations 4.1 Setup for Terminals The 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
37、 is -60dBV. If other send test signal levels are used they will be stated in the test report. The preferred way of testing 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 usi
38、ng the direct signal processing approach. The system simulator should simulate the access network and core network including 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. ETSI ETSI TR 126 954 V14.0.0 (
39、2017-07)73GPP TR 26.954 version 14.0.0 Release 14The 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 between 1 k and 10 k. Care should be taken that the output impedance triggers the UE headset microphone de
40、tection. 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 receiving interfaces of the headset connectors should have an input impedance greater than 1 k. The dynamic range of
41、 the test equipment should be consistent with (or exceed) the dynamic range provided by the UE headset electrical interface output. An optional 32 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
42、 load is used, the common ground impedance for the test system (between sending and receiving sides and including the cable used to connect the test equipment to the UE headset electrical interface) should be 50 m. NOTE 2: A common ground impedance 50 m provides a crosstalk attenuation greater than
43、56 dB between the UE output and input headset electrical interface when using a 32 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 1 ms. In case of
44、 MTSI-based speech, the reference client will allow to synchronize 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 t
45、he jitter buffer management will not compensate for clock drift. The 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
46、 jitter and the maximum jitter buffer size will be at least twice 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 st
47、atic de-jitter buffer is a first-in-first-out (FIFO) buffer which 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 o
48、pposed 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. Unde
49、r the assumption of jitter-free condition the initial jitter buffer size (filling level) will be chosen such that the maximum clock drift can be compensated without any loss of packets for a given time. For the measurement of clock drifts the jitter buffer size should be chosen such that for clock drift of up to 100 ppm no loss of packets due to buffer over- or under-run will occur for a sequence of 160 s. Unless stated otherwise, for LTE connections, the system simulator will be configured for FDD operation, with a default
