1、 ETSI TS 126 093 V15.0.0 (2018-07) Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; Mandatory speech codec speech processing functions Adaptive Multi-Rate (AMR) speech codec; Source controlled rate operation (3GPP TS 26.093 version
2、15.0.0 Release 15) TECHNICAL SPECIFICATION ETSI ETSI TS 126 093 V15.0.0 (2018-07)13GPP TS 26.093 version 15.0.0 Release 15Reference RTS/TSGS-0426093vf00 Keywords GSM,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 34
3、8 623 562 00017 - NAF 742 C Association but non lucratif enregistre 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 cont
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9、d the GSM logo are trademarks registered and owned by the GSM Association. ETSI ETSI TS 126 093 V15.0.0 (2018-07)23GPP TS 26.093 version 15.0.0 Release 15Intellectual Property Rights Essential patents IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. T
10、he 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 Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect of ETSI standards“, which is available f
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13、ndicated as being the property of ETSI, and conveys no right to use or reproduce any trademark and/or tradename. Mention of those trademarks in the present document does not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks. Foreword This Techn
14、ical 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 being references to the corresponding ETSI
15、 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“, “will not“, “can“ and “cannot“ are to be
16、 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 126 093 V15.0.0 (2018-07)33GPP TS 26.093 version 15.0.0 Release 15Contents
17、Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 5g31 Scope 6g32 References 6g33 Definitions, symbols and abbreviations . 6g33.1 Definitions 6g33.2 Symbols 7g33.3 Abbreviations . 7g34 General . 7g34.1 General organisation. 7g35 AMR SCR operation 8g35.1 Transmit (TX
18、) side . 8g35.1.1 General operation 8g35.1.2 Functions of the TX SCR handler . 9g35.1.2.1 AMR SCR Timing procedures . 9g35.1.3 The TX part of the AN 10g35.2 Receive (RX) side 11g35.2.1 General operation 11g35.2.3 Demands on the RX SCR handler 11g35.3 AMR SID Information format 12g3Annex A (normative
19、): AMR DTX handler for the GSM system (corresponding to GSM 06.93) . 13g3A.1 Scope 13g3A.2 References 13g3A.3 Definitions, symbols and abbreviations . 14g3A.3.1 Definitions 14g3A.3.2 Symbols 14g3A.3.3 Abbreviations . 14g3A.4 General . 15g3A.4.1 General organisation. 15g3A.5 Transmit (TX) side . 15g3
20、A.5.1 General operation . 16g3A.5.1.1 Functions of the TX DTX handler 16g3A.5.1.2 Functions of the TX Radio Subsystem . 18g3A.5.1.2.1 Functions of the TX Radio Subsystem for TCH/AFS . 18g3A.5.1.2.2 Functions of the TX Radio Subsystem for TCH/AHS 18g3A.5.1.2.3 Functions of the Downlink TX Radio Subsy
21、stem for TFO . 19g3A.5.1.2.4 Functions of the TX Radio Subsystem for RATSCCH . 19g3A.6 Receive (RX) side 20g3A.6.1 General operation . 20g3A.6.1.1 Functions of the RX radio subsystem . 20g3A.6.1.2 Functions of the RX DTX handler 21g3Annex B (normative): ETSI GSM-EFR SCR handler 22g3B.1 Transmit (TX)
22、 side . 22g3B.1.1 General operation . 22g3ETSI ETSI TS 126 093 V15.0.0 (2018-07)43GPP TS 26.093 version 15.0.0 Release 15B.1.2 Functions of the TX SCR handler 22g3B.1.2.1 GSM-EFR SCR Timing procedures . 22g3B.1.3 The TX part of the AN . 22g3B.1.3.1 Demands on the TX part of the Access Network 22g3B.
23、2 Receive (RX) side 23g3B.3 SID Information format 23g3Annex C (normative): TIA IS-641 SCR Handler 24g3C.1 TX-side . 24g3C.2 RX-side. 24g3C.3 SID Information format 24g3Annex D (normative): TIA TDMA-US1 SCR Handler . 25g3D.1 TX-side . 25g3D.2 RX-side. 25g3D.3 SID Information format 25g3Annex E (norm
24、ative): ARIB PDC-EFR SCR Handler . 26g3E.1 Transmit (TX) side . 26g3E.1.1 General operation . 26g3E.1.2 Functions of the TX SCR handler 26g3E.1.2.1 PDC_EFR SCR Timing procedures 26g3E.1.3 The TX part of the AN . 27g3E.1.3.1 Demands on the TX part of the Access Network 27g3E.2 Receive (RX) side 27g3E
25、.3 SID information format 27g3Annex F (informative): Change history 28g3History 29g3ETSI ETSI TS 126 093 V15.0.0 (2018-07)53GPP TS 26.093 version 15.0.0 Release 15Foreword This Technical Specification has been produced by the 3GPP. The present document describes the operation of the Adaptive Multi R
26、ate speech codec during Source Controlled Rate (SCR) operation within the 3GPP system. 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 this TS, it will be re-released by the TSG wit
27、h 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 indicates TSG approved document under change control. y the second digit is incremented for
28、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 specification; ETSI ETSI TS 126 093 V15.0.0 (2018-07)63GPP TS 26.093 version 15.0.0 Release 151 Scope This document describes t
29、he Source Controlled Rate (SCR)operation of the Adaptive Multi-Rate speech Codec in Codec Types UMTS_AMR and UMTS_AMR2 for the UMTS system. The implementation of this SCR operation is mandatory in all UMTS equipment. The description is structured according to the block diagram in figure 1. This stru
30、cture of distributing the various functions between system entities is not mandatory for implementation, as long as the operation on the speech decoder output remains the same. Annex A describes the Discontinuous Transmission (DTX) operation of the Adaptive Multi-Rate speech Codec in Codec Types FR_
31、AMR, HR_AMR and OHR_AMR for GERAN. This annex is the former GSM 06.93 (Release 98). Annexes B to E describe the SCR operation of the Adaptive Multi-Rate speech Codec in Codec Types GSM_EFR, TDMA_EFR, TDMA_US1 and PDC_EFR for the UMTS system. 2 References The following documents contain provisions wh
32、ich, 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
33、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 3GPP TS 26.071 : “AMR Speech Codec; General description“. 2 3GPP T
34、S 26.073 : “AMR Speech Codec; ANSI-C code“. 3 3GPP TS 26.074 : “AMR Speech Codec; Test sequences“. 4 3GPP TS 26.090 : “AMR Speech Codec; Transcoding functions“. 5 3GPP TS 26.091 : “AMR Speech Codec; Error concealment of lost frames“. 6 3GPP TS 26.092 : “AMR Speech Codec; Comfort noise aspects“. 7 3G
35、PP TS 26.094 : “AMR Speech Codec; Voice Activity Detector (VAD)“. 8 3GPP TS 26.101 : “AMR Speech Codec; Frame structure“. 3 Definitions, symbols and abbreviations 3.1 Definitions For the purpose of this document, the following definitions apply. frame: Time interval of 20 ms, corresponding to the ti
36、me segmentation of the Adaptive Multi Rate speech Codec, also used as a short term for a traffic frame. traffic frame: Block of 95244 information bits transmitted on the speech traffic channels. SID frame: Frame that conveys information about the acoustic background noise. speech frame: Traffic fram
37、e that has been classified as SPEECH_GOOD or SPEECH_BAD frame. ETSI ETSI TS 126 093 V15.0.0 (2018-07)73GPP TS 26.093 version 15.0.0 Release 15VAD flag: Boolean flag, generated by the VAD algorithm indicating the presence (“1“) or the absence (“0“) of a speech frame. RX_TYPE: classifies the received
38、frame. TX_TYPE: classifies the frame to be transmitted. hangover period: A period of frames added at the end of a speech burst in which VAD flag =“0“ and TX_TYPE is =“SPEECH_GOOD“, this period provides the encoder with an extra window to derive the Comfort Noise parameters . 3.2 Symbols For the purp
39、ose of this document, the following symbols apply. NelapsedNumber of elapsed frames since the last updated SID frame. 3.3 Abbreviations For the purpose of this document , the following abbreviations apply. AN Access Network SCR Source Controlled Rate operation TS Telecommunication Standard, Technica
40、l Specification GSM Global System for Mobile Telecommunication GSM-EFR GSM Enhanced Full Rate speech Codec UE User Equipment PDC-EFR ARIB PDC-EFR 6.7 kBit/s speech Codec RAN Radio Access Network RX Receive SID Silence Descriptor TDMA-EFR TIA IS-641 Enhanced speech Codec TDMA-US1 TIA TDMA-US1 (12.2 k
41、Bit/s Codec, similar to GSM-EFR) TX Transmit VAD Voice Activity Detector 4 General Source Controlled Rate operation (SCR) is a mechanism for the AMR Speech Codec, which allows to encode the input signal at a lower average rate by taking speech inactivity into account. The SCR scheme may be used for
42、the following purposes: - to save power in the User Equipment; - to reduce the overall interference and load in the networks. SCR in the transmitting path (uplink) shall be in operation in UEs, if commanded so by the network. Note that for UMTS AMR and UMTS AMR2 codec types, the uplink SCR operation
43、 shall always be activated. The UE shall handle SCR in the receiving path (downlink) at any time, regardless, whether SCR in the transmitting path is enabled or not. 4.1 General organisation The default SCR mechanism described in this document requires the following functions: - a Voice Activity Det
44、ector (VAD) on the transmit (TX) side; - evaluation of the background acoustic noise on the transmit (TX) side, in order to transmit characteristic parameters to the receive (RX) side; - generation on the receive (RX) side of a similar noise, called comfort noise, during periods where the transmissi
45、on is switched off. ETSI ETSI TS 126 093 V15.0.0 (2018-07)83GPP TS 26.093 version 15.0.0 Release 15The Voice Activity Detector (VAD) is defined in 7 and the AMR-mode comfort noise functions in 6. Both are based partly on the speech Codec and its internal variables, defined in 4. In addition to these
46、 functions, if the parameters arriving at the RX side are detected to be seriously corrupted by errors, the speech or comfort noise must be generated from substituted data in order to avoid seriously annoying effects for the listener. These functions are defined in 5. An overall description of the s
47、peech processing parts can be found in 1. An overview of one link SCR operation is shown in Figure 1. Figure 1: Block diagram of one link SCR operation 5 AMR SCR operation 5.1 Transmit (TX) side A block diagram of the transmit side SCR functions is shown in Figure 2. Figure 2: Block diagram of SCR f
48、unctions at the TX side 5.1.1 General operation The TX SCR handler passes traffic frames, individually marked by TX_TYPE, to the Framing unit. Each frame consists of bit fields containing the information bits, the codec mode indication, and the TX_TYPE. TX_TYPE shall be used to specify the contents
49、of the frame. The table below provides an overview of the different TX_TYPEs used and explains the required contents in the information bit and the mode indication bit fields. RX_TYPEMode IndicationInformation bitsTX SCR handlerSpeechEncoderVoiceActivityDetectorComfort NoiseParameterComputation“Network”Informationpacketing,transport andclassificationInformation bitsMode IndicationTX_TYPERX SCR handlerSpeechDecoderErrorConcealmentComfortNoiseGenerationTX SCR handlerSpeechEncoderVoiceActivityDetectorComfort NoiseParameterComputationTX Access NetworkTX o
