1、 ETSI TS 126 115 V15.0.0 (2018-07) Universal Mobile Telecommunications System (UMTS); LTE; Echo control for speech and multimedia services (3GPP TS 26.115 version 15.0.0 Release 15) TECHNICAL SPECIFICATION ETSI ETSI TS 126 115 V15.0.0 (2018-07)13GPP TS 26.115 version 15.0.0 Release 15Reference RTS/T
2、SGS-0426115vf00 Keywords LTE,UMTS 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 742 C Association but non lucratif enregistre la Sous-Prfecture de Grasse (06) N 7803/88 Important notice The present d
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13、in the present document does not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks. Foreword This Technical Specification (TS) has been produced by ETSI 3rd Generation Partnership Project (3GPP). The present document may refer to technical spec
14、ifications 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 identities can be found under http:/webapp.etsi.org/key/queryform.asp. Mo
15、dal verbs terminology In the present document “shall“, “shall not“, “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
16、 NOT allowed in ETSI deliverables except when used in direct citation. ETSI ETSI TS 126 115 V15.0.0 (2018-07)33GPP TS 26.115 version 15.0.0 Release 15Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 4g3Introduction 4g31 Scope 5g32 References 5g33 Abbreviat
17、ions . 5g34 Interfaces 5g35 Narrow Band Speech Telephony Network Echo Control 6g35.1 GSTN Network Echo Cancellation 6g3Annex A (informative): Change history . 7g3History 8g3ETSI ETSI TS 126 115 V15.0.0 (2018-07)43GPP TS 26.115 version 15.0.0 Release 15Foreword This Technical Specification has been p
18、roduced 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, it will be re-released by the TSG with an identifying
19、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. y the second digit is incremented for all changes of su
20、bstance, i.e. technical enhancements, corrections, updates, etc. z the third digit is incremented when editorial only changes have been incorporated in the document. Introduction The present document specifies minimum performance requirements for the transmission planning aspects of 3G speech and mu
21、lti-media services. The objective is to reach a quality as close as possible to ITU-T standards for PSTN circuits. However, due to technical and economic factors, there cannot be full compliance with the general characteristics of international telephone connections and circuits recommended by the I
22、TU-T. The performance requirements are specified the main body of the text; the test methods and considerations are described in tbd. ETSI ETSI TS 126 115 V15.0.0 (2018-07)53GPP TS 26.115 version 15.0.0 Release 151 Scope The present document specifies minimum performance requirements for the gateway
23、 echo control of 3G speech and multi-media services. The present document is applicable to any narrow band speech telephony or multimedia service. 2 References The following documents contain provisions which, through reference in this text, constitute provisions of the present document. - Reference
24、s 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 version applies. In the case of a reference to a 3GPP document (including a GSM d
25、ocument), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document. 1 ITU-T Recommendation G.114 (2000): “One-way transmission time“. 2 ITU-T Recommendation G.168 (2000): “Digital network echo cancellers“. 3 ITU-T Recommendation G.
26、131 (1996): “Control of talker echo“. 4 ITU-T Recommendation G.703 (1998): “Physical/electrical characteristics of hierarchical digital interfaces“. 5 ITU-T Recommendation G.711 (1988): “Pulse code modulation (PCM) of voice frequencies“. 3 Abbreviations For the purposes of the present document, the
27、following abbreviations apply: ADC Analogue to Digital Converter DAC Digital to Analogue Converter DTX Discontinuous Transmission EC Echo Canceller EEC Electrical Echo Control EL Echo Loss ERL Echo Return Loss ERLE Echo Return Loss Enhancement PCM Pulse Code Modulation POI Point of Interconnection (
28、with PSTN) PSTN Public Switched Telephone Network TCL Terminal Coupling Loss TX Transmission4 Interfaces The POI with the public switched telephone network (PSTN) will generally be at the 2 048 kbits/ level at an interface in accordance with ITU-T Recommendation G.703 4/G.704 or STM1 155Mbit/s. At t
29、his point, which is considered to have a relative level of 0 dBr, the analogue signals will be represented by 8-bit A-law or -law according to ITU-T Recommendation G.711 5. Analogue measurements may be made at this point using a standard send and receive side, as defined in ITU-T Recommendations. ET
30、SI ETSI TS 126 115 V15.0.0 (2018-07)63GPP TS 26.115 version 15.0.0 Release 155 Narrow Band Speech Telephony Network Echo Control 5.1 GSTN Network Echo Cancellation Narrow band speech calls from the 3G mobile system to the public GSTN are terminated on local switch line cards where two to four wire c
31、onversion takes place. The hybrid used to carry out this function is never perfect and echo is generated which degrades the speech call quality for the 3G mobile user. To overcome this situation an echo cancellation device should be used at the gateway from the 3G mobile network to the GSTN. This ec
32、ho control device shall conform to ITU-T G.168 2. NOTE: Acoustic Echo Control: Narrow band speech calls from the 3G mobile network to the public GSTN involve a high delay. The only echo path that is audible to the GSTN user is the acoustic echo path in the UE. To overcome this echo a Terminal Coupli
33、ng Loss (TCL) of 46dB should be achieved by the terminal. This provides adequate echo protection for calls up to a delay of 300ms as defined by ITU-T Recommendation G.131 3. ETSI ETSI TS 126 115 V15.0.0 (2018-07)73GPP TS 26.115 version 15.0.0 Release 15Annex A (informative): Change history Change hi
34、story Date TSG # TSG Doc. CR Rev Subject/Comment Old New 03-2000 07 SP-000020 - - Approved at TSG SA #7 and placed under Change Control - 3.0.0 03-2001 11 - - - Version for Release 4 3.0.0 4.0.0 06-2002 16 - - - Version for Release 5 4.0.0 5.0.0 12-2004 26 - - - Version for Release 6 5.0.0 6.0.0 06-
35、2007 36 - - - Version for Release 7 6.0.0 7.0.0 12-2008 42 - - - Version for Release 8 7.0.0 8.0.0 12-2009 46 Version for Release 9 8.0.0 9.0.0 03-2011 51 Version for Release 10 9.0.0 10.0.0 09-2012 57 Version for Release 11 10.0.0 11.0.0 09-2014 65 Version for Release 12 11.0.0 12.0.0 12-2015 70 Ve
36、rsion for Release 13 12.0.0 13.0.0 Change history Date Meeting TDoc CR Rev Cat Subject/Comment New version 2017-03 75 Version for Release 14 14.0.0 2018-06 80 Version for Release 15 15.0.0 ETSI ETSI TS 126 115 V15.0.0 (2018-07)83GPP TS 26.115 version 15.0.0 Release 15History Document history V15.0.0 July 2018 Publication
