1、 ETSI TS 1Digital cellular telecoUniversal Mobile TelSpeech codec sAdaptive Multi-Rate - Source c(3GPP TS 26.1TECHNICAL SPECIFICATION126 193 V13.0.0 (2016communications system (Phaelecommunications System (LTE; c speech processing functionWideband (AMR-WB) speeccontrolled rate operation .193 version
2、 13.0.0 Release 1316-01) hase 2+); (UMTS); ons; ech codec; 13) ETSI ETSI TS 126 193 V13.0.0 (2016-01)13GPP TS 26.193 version 13.0.0 Release 13Reference RTS/TSGS-0426193vd00 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
3、 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 document can be downloaded from: http:/www.etsi.org/standards-search The present document may be made available in electronic versions and/o
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9、the GSM logo are Trade Marks registered and owned by the GSM Association. ETSI ETSI TS 126 193 V13.0.0 (2016-01)23GPP TS 26.193 version 13.0.0 Release 13Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertai
10、ning 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 from the ETSI Secretar
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12、he ETSI Web server) which are, or may be, or may become, essential to the 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 identitie
13、s, 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. Modal verbs terminology In the present document “s
14、hall“, “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 NOT allowed in ETSI deliverables except when us
15、ed in direct citation. ETSI ETSI TS 126 193 V13.0.0 (2016-01)33GPP TS 26.193 version 13.0.0 Release 13Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 4g31 Scope 5g32 Normative references . 5g33 Definitions, symbols and abbreviations . 5g33.1 Definitions 5
16、g33.2 Symbols 6g33.3 Abbreviations . 6g34 General . 6g34.1 General organisation. 6g35 AMR-WB SCR operation 7g35.1 Transmit (TX) side . 7g35.1.1 General operation 7g35.1.2 Functions of the TX SCR handler . 8g35.1.2.1 AMR-WB SCR Timing procedures . 8g35.1.3 The TX part of the AN 9g35.2 Receive (RX) si
17、de 10g35.2.1 General operation 10g35.2.3 Demands on the RX SCR handler 11g35.3 AMR-WB SID Information format 11g3Annex A (normative): AMR-WB DTX handler for the GSM system . 12g3A.1 Scope 12g3A.2 References 12g3A.3 Definitions, symbols and abbreviations . 13g3A.3.1 Definitions 13g3A.3.2 Symbols 13g3
18、A.3.3 Abbreviations . 14g3A.4 General . 14g3A.4.1 General organisation. 14g3A.5 Transmit (TX) side . 15g3A.5.1 General operation . 15g3A.5.1.1 Functions of the TX DTX handler 16g3A.5.1.2 Functions of the TX Radio Subsystem . 17g3A.5.1.2.1 Functions of the TX Radio Subsystem for TCH/WFS 17g3A.5.1.2.2
19、 Functions of the Downlink TX Radio Subsystem for TFO . 18g3A.5.1.2.4 Functions of the TX Radio Subsystem for RATSCCH . 18g3A.6 Receive (RX) side 19g3A.6.1 General operation . 19g3A.6.1.1 Functions of the RX radio subsystem . 19g3A.6.1.2 Functions of the RX DTX handler 20g3Annex B: (informative) Cha
20、nge history . 21g3History 22g3ETSI ETSI TS 126 193 V13.0.0 (2016-01)43GPP TS 26.193 version 13.0.0 Release 13Foreword This Technical Specification has been produced by the 3GPP. The present document describes the operation of the Adaptive Multi Rate Wideband speech codec during Source Controlled Rat
21、e (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 with an identifying change of release date and a
22、n 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 substance, i.e. technical enha
23、ncements, corrections, updates, etc. z the third digit is incremented when editorial only changes have been incorporated in the specification; ETSI ETSI TS 126 193 V13.0.0 (2016-01)53GPP TS 26.193 version 13.0.0 Release 131 Scope This document describes the Source Controlled Rate (SCR) operation of
24、the Adaptive Multi-Rate Wideband speech Codec. The implementation of this SCR operation is mandatory in all UMTS equipment implementing the Adaptive Multi-Rate Wideband speech Codec. The description is structured according to the block diagram in Figure 1. This structure of distributing the various
25、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 Wideband speech Codec in Codec Type FR_AMR-WB for the GSM system.
26、 2 Normative references This document incorporates by dated and undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of
27、any of these publications apply to this document only when incorporated in it by amendment or revision. For undated references, the latest edition of the publication referred to applies. 1 3GPP TS 26.171 : “AMR Wideband Speech Codec; General description“. 2 3GPP TS 26.173 : “AMR Wideband Speech Code
28、c; ANSI-C code“. 3 3GPP TS 26.174 : “AMR Wideband Speech Codec; Test sequences“. 4 3GPP TS 26.190 : “AMR Wideband Speech Codec; Transcoding functions“. 5 3GPP TS 26.191 : “AMR Wideband Speech Codec; Error concealment of lost frames“. 6 3GPP TS 26.192 : “AMR Wideband Speech Codec; Comfort noise aspec
29、ts“. 7 3GPP TS 26.194 : “AMR Wideband Speech Codec; Voice Activity Detector (VAD)“. 8 3GPP TS 26.201 : AMR Wideband 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 m
30、s, corresponding to the time segmentation of the Adaptive Multi-Rate Wideband speech Codec, also used as a short term for a traffic frame. traffic frame: Block of 132477 information bits transmitted on the speech traffic channels. SID frame: Frame that conveys information about the acoustic backgrou
31、nd noise. speech frame: Traffic frame that has been classified as SPEECH_GOOD, SPEECH_BAD or SPEECH_LOST frame. VAD 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 frame. TX_TYPE: classifies the
32、 frame to be transmitted. ETSI ETSI TS 126 193 V13.0.0 (2016-01)63GPP TS 26.193 version 13.0.0 Release 13hangover 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 Co
33、mfort Noise parameters . 3.2 Symbols For the purpose 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
34、operation TS Telecommunication Standard, Technical Specification GSM Global System for Mobile Telecommunication UE User EquipmentRAN Radio Access Network RX Receive SID Silence Descriptor TX Transmit VAD Voice Activity Detector 4 General Source Controlled Rate operation (SCR) is a mechanism for the
35、AMR Wideband 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 the following purposes: -to save power in the User Equipment; -to reduce the overall interference and load in the networks. SCR in the t
36、ransmitting path (uplink) shall be in operation in UEs, if commanded so by the network. The UE shall handle SCR in the receiving path (downlink) at any time, regardless, whether SCR in the transmitting path is commanded or not. 4.1 General organisation The default SCR mechanism described in this doc
37、ument requires the following functions: -a Voice Activity Detector (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
38、, called comfort noise, during periods where the transmission is switched off. The Voice Activity Detector (VAD) is defined in 7 and the comfort noise functions in 6. Both are based partly on the speech Codec and its internal variables, defined in 4. In addition to these functions, if the parameters
39、 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 speech processing parts can be
40、 found in 1. An overview of one link SCR operation is shown in Figure 1. ETSI ETSI TS 126 193 V13.0.0 (2016-01)73GPP TS 26.193 version 13.0.0 Release 13Figure 1: Block diagram of one link SCR operation 5 AMR-WB SCR operation 5.1 Transmit (TX) side A block diagram of the transmit side SCR functions i
41、s shown in Figure 2. Figure 2: Block diagram of SCR functions 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
42、_TYPE. TX_TYPE shall be used to specify the contents 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 handlerSpeechEncoderVoiceA
43、ctivityDetectorComfort NoiseParameterComputation“Network”Informationpacketing,transport andclassificationInformation bitsMode IndicationTX_TYPERX SCR handlerSpeechDecoderErrorConcealmentComfortNoiseGenerationTX SCR handlerSpeechEncoderVoiceActivityDetectorComfort NoiseParameterComputationTX Access N
44、etworkTX ofinformationInformation bitsMode IndicationTX_TYPETS26.201Information bitsFrame TypeFQIFramingETSI ETSI TS 126 193 V13.0.0 (2016-01)83GPP TS 26.193 version 13.0.0 Release 13Table 1: SCR TX_TYPE identifiers for UMTS_AMR-WB and FR_AMR-WB TX_TYPE Information Bits Mode Indication SPEECH_GOOD S
45、peech frame, size 132477 bits, depending on codec mode Current codec mode SPEECH_BAD Corrupt speech frame (bad CRC), size 132477 bits, depending on codec mode Current codec mode SPEECH_LOST No useful information. (Note: If implementation does not support the SPEECH_LOST, SPEECH_BAD shall be used ins
46、tead) No useful information SID_FIRST Marker for the end of talkspurt, no further information, all 35 comfort noise bits set to 0 The codec mode that would have been used if TX_TYPE had been SPEECH_GOOD SID_UPDATE 35 comfort noise bits The codec mode that would have been used if TX_TYPE had been SPE
47、ECH_GOOD SID_BAD Corrupt SID update frame (bad CRC) The codec mode that would have been used if TX_TYPE had been SPEECH_GOOD NO_DATA No useful information, nothing to be transmitted No useful information TX_TYPE = SPEECH_LOST indicates that the Information Bit and Codec Mode fields do not contain an
48、y useful data (but still should be transmitted over AN). The purpose of this TX_TYPE is indicate that the frame was transmitted but lost on some previous phase. This TX_TYPEs may occur only in TFO and TrFO situations. Note, that it is possible to replace SPEECH_LOST with SPEECH_BAD but this may degr
49、ade the quality of the error concealment in the receiving end because concealment may try to use part of the received parameters from the frame which do not contain any useful information. TX_TYPE = NO_DATA indicates that the Information Bit and Codec Mode fields do not contain any useful data (and should not be transmitted over AN). The purpose of this TX_TYPE is to provide the option to save network transmission between the transcoder and AN. Note, the TX_TYPEs SPEECH_BAD, SPEECH_LOST and SID_BAD may occur in TFO and TrFO situati
