1、 ETSI TS 1Universal Mobile TelEcho control for (3GPP TS 26.1TECHNICAL SPECIFICATION126 115 V13.0.0 (2016elecommunications System (LTE; speech and multimedia serv.115 version 13.0.0 Release 1316-01) (UMTS); rvices 13) ETSI ETSI TS 126 115 V13.0.0 (2016-01)13GPP TS 26.115 version 13.0.0 Release 13Refe
2、rence RTS/TSGS-0426115vd00 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 Th
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7、modified without the written authorization of ETSI. The copyright and the foregoing restriction extend to reproduction in all media. European Telecommunications Standards Institute 2016. All rights reserved. DECTTM, PLUGTESTSTM, UMTSTMand the ETSI logo are Trade Marks of ETSI registered for the bene
8、fit 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 V13.0.0 (2016-01)23GPP TS 26.115 version 13.0.0 Release
9、 13Intellectual 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 Prope
10、rty 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 sear
11、ches, 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 produc
12、ed 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 betw
13、een 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 V13.0.0 (2016-01)33GPP TS 26.115 version 13.0.0 Release 13Contents Intellectual Property Rights 2g3Forewor
15、d . 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 V13.
16、0.0 (2016-01)43GPP TS 26.115 version 13.0.0 Release 13Foreword 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 T
17、SG 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 indicat
18、es 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 documen
19、t 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 wit
20、h 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 V13.0.0 (2016-01)53GPP TS 26.115 version 13
21、0.0 Release 131 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 provis
22、ions 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 referen
23、ce, 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 modula
25、tion (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/ lev
27、el 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 ma
28、de at this point using a standard send and receive side, as defined in ITU-T Recommendations. ETSI ETSI TS 126 115 V13.0.0 (2016-01)63GPP TS 26.115 version 13.0.0 Release 135 Narrow Band Speech Telephony Network Echo Control 5.1 GSTN Network Echo Cancellation Narrow band speech calls from the 3G mob
29、ile 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 c
30、ancellation 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 audib
31、le 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 V13.0.0 (
32、2016-01)73GPP TS 26.115 version 13.0.0 Release 13Annex 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 1
33、6 - - - 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 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 Version for Release 13 12.0.0 13.0.0 ETSI ETSI TS 126 115 V13.0.0 (2016-01)83GPP TS 26.115 version 13.0.0 Release 13History Document history V13.0.0 January 2016 Publication
