1、 ETSI TR 126 931 V15.0.0 (2018-07) Universal Mobile Telecommunications System (UMTS); LTE; Evaluation of Additional Acoustic Tests for Speech Telephony (3GPP TR 26.931 version 15.0.0 Release 15) TECHNICAL REPORT ETSI ETSI TR 126 931 V15.0.0 (2018-07)13GPP TR 26.931 version 15.0.0 Release 15Reference
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15、al 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 expression of provisions). “must“ and “must not“ are NOT allowed in ETSI de
16、liverables except when used in direct citation. ETSI ETSI TR 126 931 V15.0.0 (2018-07)33GPP TR 26.931 version 15.0.0 Release 15Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 5g3Introduction 5g31 Scope 6g32 References 6g33 Definitions and abbreviations .
17、7g33.1 Definitions 7g33.2 Abbreviations . 8g34 Release 11 “For Further Study“ Items 8g34.1 Stability loss, Headset UE 8g34.2 UE Delay, NB 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
18、, i.e. technical enhancements, corrections, updates, etc. z the third digit is incremented when editorial only changes have been incorporated in the document. Introduction Mobile telephony devices and voice services continue to develop and evolve and their associated minimum performance requirements
19、 and test methodologies also need to stay relevant and representative of quality demands. While many advances were made in Release 11 to the acoustic requirements and test specifications in TS 26.131 13 and TS 26.132 8 many items therein were left marked “for further study“ and require a final decis
20、ion by SA4. Additionally, there are new acoustic requirements and emerging tests worth considering in a future release, but that require further study before incorporation into specifications. This technical report will, first and foremost, address the remaining items presently designated as “for fu
21、rther study“ in TS 26.131 13 and TS 26.132 8. The present document will also examine opportunities for new acoustic tests and requirements that help us to better characterize the UE acoustic experience, opportunities to replace existing test methods with others that are more accurate or more efficie
22、nt and make specific recommendations for their inclusion in existing or new specifications. ETSI ETSI TR 126 931 V15.0.0 (2018-07)63GPP TR 26.931 version 15.0.0 Release 151 Scope The scope of the present document is to investigate, first and foremost, the existing items presently designated as “for
23、further study“ in TS 26.131 13 and TS 26.132 8. The investigation will additionally identify, examine and evaluate opportunities for new acoustic tests and requirements that better help characterize the UE acoustic experience, opportunities to replace existing test methods with others that are more
24、accurate or more efficient and to make specific recommendations for their inclusion in existing or new specifications. While many advances were made in Release 11 to the acoustic requirements and test specifications in TS 26.131 13 and TS 26.132 8 many items therein were left marked “for further stu
25、dy“ and require a final disposition by SA4 including: - NB Part 1: Background noise simulation technique and background noise database“. 8 3GPP TS 26.132: “Technical Specification Group Services and System Aspects; Speech and video telephony terminal acoustic test specification“. 9 Recommendation IT
26、U-T P.862.1 (11/2003): “Mapping function for transforming P.862 raw result scores to MOS-LQO“. 10 Recommendation ITU-T P.862.2 (11/2007): “Wideband extensions to Recommendation P.862 for the assessment of wideband telephone networks and speech codecs“. 11 ETSI EG 202 396-3 (V1.5.1): “Speech quality
27、performance in the presence of background noise; Part 3: Background noise transmission - Objective test methods“. 12 Recommendation ITU-T P.64, Annex E (11/2007): “Determination of sensitivity/frequency characteristics of local telephone systems“. 13 3GPP TS 26.131: “Technical Specification Group Se
28、rvices and System Aspects; Terminal acoustic characteristics for telephony“. 14 ETSI TS 103 224 (V1.3.1): “Speech and multimedia Transmission Quality (STQ); A sound field reproduction method for terminal testing including a background noise database“. 15 Recommendation ITU-T P.58: “Head and Torso si
29、mulator for Telephonometry“. 16 Recommendation ITU-T P.502 (05/2000): “Objective test methods for speech communication systems using complex test signals“. 17 Recommendation ITU-T P.863.1 (09/2014): “Application guide for Recommendation ITU-T P.863“. 18 Recommendation ITU-T P.1401 (07/2012): “Method
30、s, metrics and procedures for statistical evaluation, qualification and comparison of objective quality prediction models“. 19 Recommendation ITU-T P. 79 (11/2007): “Calculation of loudness ratings for telephone sets“. 20 ETSI TS 103 281 (V1.1.1): “Speech quality in the presence of background noise:
31、 objective test methods for SWB and FB terminals“. 21 Recommendation ITU-T P.501: “Test signals for use in telephonometry“. 22 ETSI TS 103 557 (V1.1.1): “Methods for reproducing reverberation for communication device measurements“. 23 Recommendation ITU-T P.862 (2001) Corrigendum 1 (10/2017). 24 Rec
32、ommendation ITU-T P.831: “Subjective performance evaluation of network echo cancellers“ (12/1998). 3 Definitions 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
33、takes precedence over the definition of the same term, if any, in TR 21.905 1. ETSI ETSI TR 126 931 V15.0.0 (2018-07)83GPP TR 26.931 version 15.0.0 Release 153.2 Abbreviations For the purposes of the present document, the abbreviations given in TR 21.905 1 and the following apply. An abbreviation de
34、fined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905 1. HHS Hand-held speakerphone (= Hand-held hands-free) 4 Release 11 “For Further Study“ Items 4.1 Stability loss, Headset UE Void 4.2 UE Delay, NB this was realized by shifting the devic
35、e 1 cm higher than the default mounting. This shift takes into account that the dimensions of HATS as defined in 15 are felt to be too small compared to the head size of many people today and such the distance from mouth to microphone and the cheek shadow effect might not be properly taken into acco
36、unt in tests. To some extent this shadowing effect can be compensated in sending by shifting the DUT. In order to provide a better separation to the existing positions, this new alternative position is named “vertical“ in the following clauses. Position II: Table 7c MECRP (delta from actual ECRP) Ax
37、is Delta mm ye 0 ze 10 Table 7d Angle settings Angle Delta from standard angle A 45 B 0 C 5 For both mountings, an application force of 8N was used. 5.3.2.2 Background Noise Systems 5.3.2.2.0 General For the generation of background noise during the measurements two different simulation approaches w
38、ere used: the new simulation technique described in ETSI TS 103 224 14 and the present industry standard described in ETSI ES 202 396-1 7. Both systems were set up and equalized in a small, mostly non-reverberant room (RT60 100 ms). The next two paragraphs summarize the properties of these two systems.
