1、 ETSI TS 146 011 V14.0.0 (2017-04) Digital cellular telecommunications system (Phase 2+) (GSM); Full rate speech; Substitution and muting of lost frames for full rate speech channels (3GPP TS 46.011 version 14.0.0 Release 14) TECHNICAL SPECIFICATION GLOBAL SYSTEM FOR MOBILE COMMUNICATIONSRETSI ETSI
2、TS 146 011 V14.0.0 (2017-04)13GPP TS 46.011 version 14.0.0 Release 14Reference RTS/TSGS-0446011ve00 Keywords GSM 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 enreg
3、istre la Sous-Prfecture de Grasse (06) N 7803/88 Important notice The present document 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 doc
4、ument shall not be modified without the prior written authorization of ETSI. In case of any existing or perceived difference in contents between such versions and/or in print, the only prevailing document is the print of the Portable Document Format (PDF) version kept on a specific network drive wit
5、hin ETSI Secretariat. Users of the present document should be aware that the document may be subject to revision or change of status. Information on the current status of this and other ETSI documents is available at https:/portal.etsi.org/TB/ETSIDeliverableStatus.aspx If you find errors in the pres
6、ent document, please send your comment to one of the following services: https:/portal.etsi.org/People/CommiteeSupportStaff.aspx Copyright Notification No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm except as authoriz
7、ed by written permission of ETSI. The content of the PDF version shall not be modified 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, PLUGTE
8、STSTM, 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 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
9、. ETSI ETSI TS 146 011 V14.0.0 (2017-04)23GPP TS 46.011 version 14.0.0 Release 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 mem
10、bers and non-members, and can be found in ETSI SR 000 314: “Intellectual Property 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.ets
11、i.org/). Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, 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 th
12、e present document. Foreword This Technical Specification (TS) has been produced 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 bei
13、ng 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. Modal verbs terminology In the present document “shall“, “shall not“, “should“, “should not“, “may“, “need not“, “will“, “
14、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 deliverables except when used in direct citation. ETSI ETSI TS 146 011 V14.0.0 (2017-04)33GPP TS 46
15、.011 version 14.0.0 Release 14Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 4g31 Scope 5g32 References 5g33 Definitions and abbreviations . 5g34 General . 5g35 Requirements 5g35.1 First lost speech frame 5g35.2 Subsequent lost speech frames . 6g35.3 Fir
16、st lost SID frame 6g35.4 Subsequent lost SID frame . 6g36 Example solution 6g3Annex A (informative): Change history . 8g3History 9g3ETSI ETSI TS 146 011 V14.0.0 (2017-04)43GPP TS 46.011 version 14.0.0 Release 14Foreword This Technical Specification has been produced by the 3rdGeneration Partnership
17、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 release date and an increase in
18、 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. technical enhancements, cor
19、rections, updates, etc. z the third digit is incremented when editorial only changes have been incorporated in the document. ETSI ETSI TS 146 011 V14.0.0 (2017-04)53GPP TS 46.011 version 14.0.0 Release 141 Scope The present document defines a frame substitution and muting procedure which shall be us
20、ed by the RX DTX handler when one or more lost speech or SID frames are received from the radio subsystem. The requirements of the present document are mandatory for implementation in all GSM Base Station Systems (BSS) and Mobile Stations (MS). 2 References The following documents contain provisions
21、 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 reference,
22、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 GSM 01.04: “Digital cellular telecommunications system (Phase 2+); Ab
23、breviations and acronyms“. 2 GSM 06.10: “Digital cellular telecommunications system (Phase 2+); Full rate speech; Transcoding“. 3 GSM 06.31: “Digital cellular telecommunications system (Phase 2+); Full rate speech; Discontinuous Transmission (DTX) for full rate speech traffic channel“. 3 Definitions
24、 and abbreviations Abbreviations used in the present document are listed in GSM 01.04 1. The definitions of terms used in the present document can be found in GSM 06.31 3. 4 General The purpose of the frame substitution is to conceal the effect of lost frames. The purpose of muting the output in the
25、 case of several lost frames is to indicate the breakdown of the channel to the user. 5 Requirements 5.1 First lost speech frame Normal decoding of lost speech frames would result in very unpleasant noise effects. In order to improve the subjective quality, the first lost speech frame shall be subst
26、ituted with either a repetition or an extrapolation of the previous good speech frame(s). Lost speech frames shall not be delivered to the speech decoder, nor shall the output be muted directly. ETSI ETSI TS 146 011 V14.0.0 (2017-04)63GPP TS 46.011 version 14.0.0 Release 145.2 Subsequent lost speech
27、 frames For subsequent lost speech frames, a muting technique shall be used that will gradually decrease the output level, resulting in silencing of the output after a maximum of 320 ms. Clause 6 gives an example solution. 5.3 First lost SID frame A single lost SID frame shall be substituted by the
28、last valid SID frame and the procedure for valid SID frames be applied as described in GSM 06.31 3. 5.4 Subsequent lost SID frame For the second lost SID frame, a muting technique shall be used on the comfort noise that will gradually decrease the output level, resulting in silencing of the output a
29、fter a maximum of 320 ms. Clause 6 gives an example solution. For subsequent lost SID frames, the muting of the output shall be maintained. 6 Example solution For guidance, an example solution is given. The first lost speech frame is replaced at the speech decoder input by the previous good speech f
30、rame. Normal decoding is then performed. The muting procedure to be used in the case of subsequent lost speech frames or for comfort noise frames following the second lost SID frame is as follows: The pseudo-logarithmic encoded block amplitude Xmaxcr (GSM 06.10 2), coded on the interval from 0 to 63
31、, is decreased with a constant value d=4 in each frame, down to the lowest possible value. Consequently, Xmaxcr will be reduced gradually, and the output muted after a maximum of 320 ms. The grid position parameters are chosen randomly between 0 and 3 during this time. For subsequent unusable frames
32、, after the frame where Xmaxcr reached the lowest possible value, “silence frames“ are passed from the RX DTX handler to the speech decoder to guarantee a low output level under all conditions. The silence frame is defined in table 1. ETSI ETSI TS 146 011 V14.0.0 (2017-04)73GPP TS 46.011 version 14.
33、0.0 Release 14Table 1: Encoded parameters (GSM 06.10) of the silence frame Log area ratio 1 = 42 Log area ratio 2 = 39 Log area ratio 3 = 21 Log area ratio 4 = 10 Log area ratio 5 = 9 Log area ratio 6 = 4 Log area ratio 7 = 3 Log area ratio 8 = 2 _ LTP gain = 0 LTP lag = 40 Grid position = 1 Block a
34、mplitude = 0 RPE pulse no. 1 = 3 RPE pulse no. 2 = 4 RPE pulse no. 3 = 3 RPE pulse no. 4 = 4 RPE pulse no. 5 = 4 - repeated for each subsegment RPE pulse no. 6 = 3 RPE pulse no. 7 = 3 RPE pulse no. 8 = 3 RPE pulse no. 9 = 3 RPE pulse no. 10 = 4 RPE pulse no. 11 = 4 RPE pulse no. 12 = 3 RPE pulse no.
35、 13 = 3 _ ETSI ETSI TS 146 011 V14.0.0 (2017-04)83GPP TS 46.011 version 14.0.0 Release 14Annex A (informative): Change history Change history SMG No. TDoc. No. CR. No. Section affected New version Subject/Comments SMG#07 4.0.4 ETSI Publication SMG#20 5.0.1 Release 1996 version SMG#27 6.0.0 Release 1
36、997 version SMG#28 6.0.1 ETSI Publication SMG#29 7.0.0 Specification version 6.0.0 upgrade to Release 1998 version 7.0.0 7.0.1 Version update for Publication SMG#31 8.0.0 Release 1999 version Change history Date TSG # TSG Doc. CR Rev Subject/Comment Old New 03-2001 11 Version for Release 4 4.0.0 06-
37、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 06-2007 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
38、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 03-2017 SA#75 Version for Release 14 14.0.0 ETSI ETSI TS 146 011 V14.0.0 (2017-04)93GPP TS 46.011 version 14.0.0 Release 14History Document history V14.0.0 April 2017 Publication
