1、 ETSI TS 1Mission CritiCodecs(3GPP TS 26.1TECHNICAL SPECIFICATION126 179 V13.0.0 (2016LTE; ritical Push To Talk (MCPTT); ecs and media handling .179 version 13.0.0 Release 1316-05) 13) ETSI ETSI TS 126 179 V13.0.0 (2016-05)13GPP TS 26.179 version 13.0.0 Release 13Reference DTS/TSGS-0426179vd00 Keywo
2、rds LTE 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 document can be downloaded
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8、e 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 126 179 V13.0.0 (2016-05)23GPP TS 26.179 version 13.0.0 Release 13Intellectual Property Rights IPRs
9、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 Property Rights (IPRs); Essential, or pote
10、ntially 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 searches, has been carried out by ETSI. N
11、o 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 produced by ETSI 3rd Generation Partnership
12、 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 between GSM, UMTS, 3GPP and ETSI identiti
13、es 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 of the ETSI Drafting Rules (Verbal f
14、orms for the expression of provisions). “must“ and “must not“ are NOT allowed in ETSI deliverables except when used in direct citation. ETSI ETSI TS 126 179 V13.0.0 (2016-05)33GPP TS 26.179 version 13.0.0 Release 13Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3For
15、eword . 4g31 Scope 5g32 References 5g33 Definitions and abbreviations . 6g33.1 Definitions 6g33.2 Abbreviations . 6g34 Codecs and media handling for MCPTT 6g34.1 MCPTT client . 6g34.1.1 Codec 6g34.1.2 Control plane protocol 7g34.1.3 User plane protocol . 7g34.1.4 De-jitter buffer 8g34.2 MCPTT networ
16、k 8g34.2.1 Control plane protocol 8g3Annex A (informative): Change history . 9g3History 10g3ETSI ETSI TS 126 179 V13.0.0 (2016-05)43GPP TS 26.179 version 13.0.0 Release 13Foreword This Technical Specification has been produced by the 3rdGeneration Partnership Project (3GPP). The contents of the pres
17、ent 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 version number as follows: Version x.y.
18、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, corrections, updates, etc. z the third digi
19、t is incremented when editorial only changes have been incorporated in the document. ETSI ETSI TS 126 179 V13.0.0 (2016-05)53GPP TS 26.179 version 13.0.0 Release 131 Scope The present document specifies the codecs and media handling for MCPTT. The corresponding service requirements are defined in 3G
20、PP TS 22.179 2. The corresponding functional architecture, procedures and information flows are defined in 3GPP TS 23.179 3. NOTE: 3GPP TR 26.879 4 provides background information to the content of this TS. 2 References The following documents contain provisions which, through reference in this text
21、, 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, the latest version applies. In t
22、he 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 TR 21.905: “Vocabulary for 3GPP Specifications“. 2 3GPP TS 22.179: “Mission Critical Push To Tal
23、k (MCPTT) over LTE; Stage 1“. 3 3GPP TS 23.179: “Functional architecture and information flows to support mission critical communication services; Stage 2“. 4 3GPP TR 26.879: “Media codecs and Multimedia Broadcast/Multicast Service (MBMS) enhancements for MCPTT over LTE“. 5 3GPP TS 24.379: “Mission
24、Critical Push To Talk (MCPTT) call control; Protocol specification“. 6 3GPP TS 24.380: “Mission Critical Push To Talk (MCPTT) media plane control; Protocol specification“. 7 3GPP TS 26.171: “Speech codec speech processing functions; Adaptive Multi-Rate - Wideband (AMR-WB) speech codec; General descr
25、iption“. 8 3GPP TS 26.173: “ANCI-C code for the Adaptive Multi Rate - Wideband (AMR-WB) speech codec“. 9 3GPP TS 26.190: “Speech codec speech processing functions; Adaptive Multi-Rate - Wideband (AMR-WB) speech codec; Transcoding functions“. 10 3GPP TS 26.191: “Speech codec speech processing functio
26、ns; Adaptive Multi-Rate - Wideband (AMR-WB) speech codec; Error concealment of erroneous or lost frames“. 11 3GPP TS 26.192: “Speech codec speech processing functions; Adaptive Multi-Rate - Wideband (AMR-WB) speech codec; Comfort noise aspects“. 12 3GPP TS 26.193: “Speech codec speech processing fun
27、ctions; Adaptive Multi-Rate - Wideband (AMR-WB) speech codec; Source controlled rate operation“. 13 3GPP TS 26.194: “Speech codec speech processing functions; Adaptive Multi-Rate - Wideband (AMR-WB) speech codec; Voice Activity Detector (VAD)“. 14 3GPP TS 26.204: “Speech codec speech processing func
28、tions; Adaptive Multi-Rate - Wideband (AMR-WB) speech codec; ANSI-C code“. 15 3GPP TS 26.441: “Codec for Enhanced Voice Services (EVS); General overview“. ETSI ETSI TS 126 179 V13.0.0 (2016-05)63GPP TS 26.179 version 13.0.0 Release 1316 3GPP TS 26.442: “Codec for Enhanced Voice Services (EVS); ANSI
29、C code (fixed-point)“. 17 3GPP TS 26.443: “Codec for Enhanced Voice Services (EVS); ANSI C code (floating-point)“. 18 3GPP TS 26.445: “Codec for Enhanced Voice Services (EVS); Detailed algorithmic description“. 19 3GPP TS 26.447: “Codec for Enhanced Voice Services (EVS); Error concealment of lost pa
30、ckets“. 20 3GPP TS 26.449: “Codec for Enhanced Voice Services (EVS); Comfort Noise Generation (CNG) aspects“. 21 3GPP TS 26.450: “Codec for Enhanced Voice Services (EVS); Discontinuous Transmission (DTX)“. 22 3GPP TS 26.451: “Codec for Enhanced Voice Services (EVS); Voice Activity Detection (VAD)“.
31、23 IETF RFC 4867 (2007): “RTP Payload Format and File Storage Format for the Adaptive Multi-Rate (AMR) and Adaptive Multi-Rate Wideband (AMR-WB) Audio Codecs“, J. Sjoberg, M. Westerlund, A. Lakaniemi and Q. Xie. 3 Definitions and abbreviations 3.1 Definitions For the purposes of the present document
32、, the terms and definitions given in 3GPP TR 21.905 1 and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in 3GPP TR 21.905 1. (void) 3.2 Abbreviations For the purposes of the present document, the abbreviations given in 3GPP
33、 TR 21.905 1 and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in 3GPP TR 21.905 1. AMR-WB Adaptive Multi Rate Wideband (codec) EVS Enhanced Voice Services FB Fullband KPI Key Performance Indicator MBMS Mul
34、timedia Broadcast Multicast Services MBSFN Multicast Broadcast Single Frequency Network MCPTT Mission Critical Push-To-Talk SWB Super Wideband WB Wideband 4 Codecs and media handling for MCPTT 4.1 MCPTT client 4.1.1 Codec MCPTT clients shall support the AMR-WB codec as specified in 3GPP TS 26.171 7,
35、 3GPP TS 26.190 9, 3GPP TS 26.173 8 and 3GPP TS 26.204 14, including all 9 modes and source controlled rate operation as specified in 3GPP TS 26.193 12, voice activity detection as specified in 3GPP TS 26.194 13, comfort noise generation as specified in ETSI ETSI TS 126 179 V13.0.0 (2016-05)73GPP TS
36、 26.179 version 13.0.0 Release 133GPP TS 26.192 11 and error concealment as specified in TS 26.19110. The MCPTT clients shall be capable of operating with any subset of these 9 codec modes. Based on operator / MCPTT service provider policy, MCPTT clients may additionally support the EVS codec in sup
37、er-wideband mode. If an operator / MCPTT service provider chooses to additionally use SWB according to its policy, then an MCPTT client that offers super-wideband speech communication shall support the EVS codec in SWB mode as defined in 3GPP TS 26.441 15, 3GPP TS 26.445 18, 3GPP TS 26.442 16, 3GPP
38、TS 26.443 17, discontinuous transmission 3GPP TS 26.450 21, voice activity detection as specified in 3GPP TS 26.451 22, comfort noise generation as specified in 3GPP TS 26.449 20 and error concealment as specified in TS 26.447 19. NOTE: In evaluating the codec alternatives for MCPTT, two codecs; AMR
39、-WB and EVS were considered in detail. The EVS codec was shown to provide statistically significant performance improvements relative to the AMR-WB codec for some of the MCPTT KPIs as studied and reported in the TR 26.879 4. After consideration of all factors in Release 13, as documented in TR 26.87
40、9 4, the currently widely deployed and available AMR-WB codec meets the needs of MCPTT services and was decided upon as the mandatory codec for MCPTT. 4.1.2 Control plane protocol General MCPTT client procedures for SDP offer-answer are specified in 3GPP TS 24.379 5 and 3GPP TS 24.380 6. MCPTT clien
41、ts shall support and offer a payload type with AMR-WB. If an operator / MCPTT service provider policy enables an MCPTT service using the EVS codec in SWB mode, then MCPTT clients may, based on operator / MCPTT service provider policy, additionally offer a payload type with the EVS codec in SWB mode.
42、 The offer-answer protocol, setting of the codec preference order, and the generation of SDP offer and answer shall be configured according to operator / MCPTT service provider policy. 4.1.3 User plane protocol An MCPTT client shall understand the payload formats and options as defined in RFC 4867 2
43、3. The MCPTT client does not have to support operating according to all the options defined in RFC 4867 but shall be capable of properly accepting or rejecting all options. The following payload format options from RFC 4867 are defined as follows to ensure minimum interoperability: - bandwidth-effic
44、ient shall be supported - mode-set: shall support all modes and shall offer no particular mode set - mode-change-period: both “1“ and “2“ shall be supported, “1“ shall be offered (or not included) - mode-change-capability: both “1“ and “2“ shall be supported, “2“ shall be offered - mode-change-neigh
45、bor: both “0“ and “1“ shall be supported, “0“ shall be offered (or not included) - channels: shall offer “1“ Other parameters: - ptime: shall be supported, “20“ shall be offered - maxptime: shall be supported, “240“ shall be offered - max-red: shall be supported, “0“ shall be offered If, based on op
46、erator / MCPTT service provider policy, the MCPTT service additionally supports the EVS codec in SWB mode, then an MCPTT client that supports the optional EVS codec in SWB mode shall understand the EVS payload format as specified in 3GPP TS 26.445 18 in order to support EVS in SWB mode. The MCPTT cl
47、ient does not have to support operating according to all the options defined in 3GPP TS 26.445 18 but must be capable of properly accepting or rejecting all options. ETSI ETSI TS 126 179 V13.0.0 (2016-05)83GPP TS 26.179 version 13.0.0 Release 134.1.4 De-jitter buffer When MCPTT voice traffic is rece
48、ived on the MBMS bearer in MBMS/MBSFN, the traffic is scheduled to arrive at intervals of multiples of 40ms. The received traffic could also exhibit time-varying jitter introduced in the backhaul and the uplink transmission by the talker before being scheduled for transmission on the MBMS bearer. Th
49、e MCPTT UE receiving traffic on an MBMS bearer shall support and use a de-jitter buffer that is able to manage this amount of jitter. 4.2 MCPTT network 4.2.1 Control plane protocol MCPTT Server procedures are specified in 3GPP TS 24.379 5 and 3GPP TS 24.380 6. MCPTT call media codec information shall include codecs according to MCPTT Client capabilities as specified in clause 4.1.1. ETSI ETSI TS 126 179 V13.0.0 (2016-05)93GPP TS 26.179 version 13.0.0 Release 13Annex A
