1、 ETSI TS 126 115 V14.0.0 (2017-04) Universal Mobile Telecommunications System (UMTS); LTE; Echo control for speech and multimedia services (3GPP TS 26.115 version 14.0.0 Release 14) TECHNICAL SPECIFICATION ETSI ETSI TS 126 115 V14.0.0 (2017-04)13GPP TS 26.115 version 14.0.0 Release 14Reference RTS/T
2、SGS-0426115ve00 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
3、ocument can be downloaded from: http:/www.etsi.org/standards-search The present document may be made available in electronic versions and/or in print. The content of any electronic and/or print versions of the present document shall not be modified without the prior written authorization of ETSI. In
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7、odified without the written authorization of ETSI. The copyright and the foregoing restriction extend to reproduction in all media. European Telecommunications Standards Institute 2017. All rights reserved. DECTTM, PLUGTESTSTM, UMTSTMand the ETSI logo are Trade Marks of ETSI registered for the benef
8、it of its Members. 3GPPTM and LTE are Trade Marks of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. GSM and the GSM logo are Trade Marks registered and owned by the GSM Association. ETSI ETSI TS 126 115 V14.0.0 (2017-04)23GPP TS 26.115 version 14.0.0 Release
9、14Intellectual Property 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 Proper
10、ty Rights (IPRs); Essential, 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 searc
11、hes, has been carried 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 Specification (TS) has been produce
12、d 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. These should be interpreted as being references to the corresponding ETSI deliverables. The cross reference betwe
13、en GSM, UMTS, 3GPP and ETSI identities can be found under http:/webapp.etsi.org/key/queryform.asp. Modal 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
14、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 TS 126 115 V14.0.0 (2017-04)33GPP TS 26.115 version 14.0.0 Release 14Contents Intellectual Property Rights 2g3Foreword
15、 . 2g3Modal verbs terminology 2g3Foreword . 4g3Introduction 4g31 Scope 5g32 References 5g33 Abbreviations . 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 V14.0
16、.0 (2017-04)43GPP TS 26.115 version 14.0.0 Release 14Foreword This Technical Specification 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 TS
17、G 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 information; 2 presented to TSG for approval; 3 or greater indicate
18、s 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 been incorporated in the document. Introduction The present document
19、 specifies minimum performance requirements for the transmission planning aspects of 3G speech and multi-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
20、 the general characteristics of international telephone connections and circuits recommended by the ITU-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 V14.0.0 (2017-04)53GPP TS 26.115 version 14.
21、0.0 Release 141 Scope The present document specifies minimum performance requirements for the gateway 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 provisi
22、ons 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-specific referenc
23、e, 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 ITU-T Recommendation G.114 (2000): “One-way transmission time“. 2
24、ITU-T Recommendation G.168 (2000): “Digital network echo cancellers“. 3 ITU-T Recommendation G.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 modulat
25、ion (PCM) of voice frequencies“. 3 Abbreviations For the purposes of the present document, the 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
26、Loss ERLE Echo Return Loss Enhancement PCM Pulse Code Modulation POI Point of Interconnection (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/ leve
27、l at an interface in accordance with ITU-T Recommendation G.703 4/G.704 or STM1 155Mbit/s. At this 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 mad
28、e at this point using a standard send and receive side, as defined in ITU-T Recommendations. ETSI ETSI TS 126 115 V14.0.0 (2017-04)63GPP TS 26.115 version 14.0.0 Release 145 Narrow Band Speech Telephony Network Echo Control 5.1 GSTN Network Echo Cancellation Narrow band speech calls from the 3G mobi
29、le system to the public GSTN are terminated on local switch line cards where two to four wire conversion 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 ca
30、ncellation device should be used at the gateway from the 3G mobile network to the GSTN. This echo 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 audibl
31、e to the GSTN user is the acoustic echo path in the UE. To overcome this echo a Terminal Coupling 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 V14.0.0 (2
32、017-04)73GPP TS 26.115 version 14.0.0 Release 14Annex A (informative): Change history Change history 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
33、 - - - Version for Release 5 4.0.0 5.0.0 12-2004 26 - - - Version for Release 6 5.0.0 6.0.0 06-2007 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 Ver
34、sion 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 Version 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 ETSI ETSI TS 126 115 V14.0.0 (2017-04)83GPP TS 26.115 version 14.0.0 Release 14History Document history V14.0.0 April 2017 Publication
