1、 ETSI TS 126 179 V14.0.0 (2017-04) LTE; Mission Critical Push To Talk (MCPTT); Codecs and media handling (3GPP TS 26.179 version 14.0.0 Release 14) TECHNICAL SPECIFICATION ETSI ETSI TS 126 179 V14.0.0 (2017-04)13GPP TS 26.179 version 14.0.0 Release 14Reference RTS/TSGS-0426179ve00 Keywords LTE ETSI
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7、on of ETSI. The copyright and the foregoing restriction extend to reproduction in all media. European Telecommunications Standards Institute 2017. All rights reserved. DECTTM, PLUGTESTSTM, UMTSTMand the ETSI logo are Trade Marks of ETSI registered for the benefit of its Members. 3GPPTM and LTE are T
8、rade 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 V14.0.0 (2017-04)23GPP TS 26.179 version 14.0.0 Release 14Intellectual Property Rights IPRs ess
9、ential 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 potenti
10、ally 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. No g
11、uarantee 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 Pr
12、oject (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 identities
13、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 form
14、s 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 V14.0.0 (2017-04)33GPP TS 26.179 version 14.0.0 Release 14Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Forewo
15、rd . 4g3Introduction 4g31 Scope 5g32 References 5g33 Definitions and abbreviations . 6g33.1 Definitions 6g33.2 Abbreviations . 6g34 Codecs and media handling for MCPTT 7g34.1 MCPTT client . 7g34.1.1 Codec 7g34.1.2 Control plane protocol 7g34.1.3 User plane protocol . 7g34.1.4 De-jitter buffer 8g34.2
16、 MCPTT network 8g34.2.1 Control plane protocol 8g3Annex A (informative): Change history . 9g3History 10g3ETSI ETSI TS 126 179 V14.0.0 (2017-04)43GPP TS 26.179 version 14.0.0 Release 14Foreword This Technical Specification has been produced by the 3rdGeneration Partnership Project (3GPP). The content
17、s 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 version number as follows:
18、 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, corrections, updates, etc. z t
19、he third digit is incremented when editorial only changes have been incorporated in the document. Introduction Requirements for codecs and media handling in support of the Mission Critical Push To Talk (MCPTT) service are contained in this document. The MCPTT service supports voice communication bet
20、ween several users (i.e. group call), where each user has the ability to gain access to the permission to talk in an arbitrated manner. The MCPTT service also supports private calls between two users. Background information in support of this document may be found in TR 26.989 4. ETSI ETSI TS 126 17
21、9 V14.0.0 (2017-04)53GPP TS 26.179 version 14.0.0 Release 141 Scope The present document specifies the codecs and media handling for MCPTT. The corresponding service requirements are defined in 3GPP TS 22.179 2. The corresponding functional architecture, procedures and information flows are defined
22、in 3GPP TS 23.179 3. 2 References The following documents contain provisions 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 speci
23、fic reference, subsequent revisions do not apply. - For a non-specific reference, 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
24、 document. 1 3GPP TR 21.905: “Vocabulary for 3GPP Specifications“. 2 3GPP TS 22.179: “Mission Critical Push To Talk (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 26.989: “Media code
25、cs and Multimedia Broadcast/Multicast Service (MBMS) enhancements for MCPTT over LTE“. 5 3GPP TS 24.379: “Mission 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 26.1
26、71: “Speech codec speech processing functions; Adaptive Multi-Rate - Wideband (AMR-WB) speech codec; General description“. 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 -
27、Wideband (AMR-WB) speech codec; Transcoding functions“. 10 3GPP TS 26.191: “Speech codec speech processing functions; 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-Rat
28、e - Wideband (AMR-WB) speech codec; Comfort noise aspects“. 12 3GPP TS 26.193: “Speech codec speech processing functions; 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 - Wideb
29、and (AMR-WB) speech codec; Voice Activity Detector (VAD)“. 14 3GPP TS 26.204: “Speech codec speech processing functions; Adaptive Multi-Rate - Wideband (AMR-WB) speech codec; ANSI-C code“. 15 3GPP TS 26.441: “Codec for Enhanced Voice Services (EVS); General overview“. 16 3GPP TS 26.442: “Codec for E
30、nhanced Voice Services (EVS); ANSI C code (fixed-point)“. ETSI ETSI TS 126 179 V14.0.0 (2017-04)63GPP TS 26.179 version 14.0.0 Release 1417 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 a
31、lgorithmic description“. 19 3GPP TS 26.447: “Codec for Enhanced Voice Services (EVS); Error concealment of lost packets“. 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 T
32、ransmission (DTX)“. 22 3GPP TS 26.451: “Codec for Enhanced Voice Services (EVS); Voice Activity Detection (VAD)“. 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,
33、 A. Lakaniemi and Q. Xie. 24 IETF RFC 3550 (2003): “RTP: A Transport Protocol for Real-Time Applications“, H. Schulzrinne, S. Casner, R. Frederick, V. Jacobson. 25 IETF RFC 3551 (2003): “RTP Profile for Audio and Video Conferences with Minimal Control”, H. Schulzerinne, S. Casner. 26 IETF RFC 3711 (
34、2004): “The Secure Real-time Transport Protocol (SRTP)“, M. Baugher, D. McGrew, M. Naslund, E. Carrara, K. Norrman. 3 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the terms and definitions given in 3GPP TR 21.905 1 and the following apply. A term defined in
35、 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 TR 21.905 1 and the following apply. An abbreviation defined in the present document takes prec
36、edence over the definition of the same abbreviation, if any, in 3GPP TR 21.905 1. AMR-WB Adaptive Multi Rate Wideband (codec) AVP Audio-Video Profile EVS Enhanced Voice Services FB Fullband KPI Key Performance Indicator MBMS Multimedia Broadcast Multicast Services MBSFN Multicast Broadcast Single Fr
37、equency Network MCPTT Mission Critical Push-To-Talk RTP Real-time Transport Protocol SAVP Secure Audio-Video ProfileSRTP Secure Real-time Transport Protocol SWB Super Wideband WB Wideband ETSI ETSI TS 126 179 V14.0.0 (2017-04)73GPP TS 26.179 version 14.0.0 Release 144 Codecs and media handling for M
38、CPTT 4.1 MCPTT client 4.1.1 Codec MCPTT clients shall support the AMR-WB codec as specified in 3GPP TS 26.171 7, 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 specifi
39、ed in 3GPP TS 26.194 13, comfort noise generation as specified in 3GPP 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 addition
40、ally support the EVS codec in super-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
41、.445 18, 3GPP TS 26.442 16, 3GPP 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 altern
42、atives for MCPTT, two codecs; AMR-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 26.989 4. After consideration of all factors in Rele
43、ase 13, as documented in TR 26.989 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
44、and 3GPP TS 24.380 6. MCPTT clients shall support both “RTP/AVP” 25 and “RTP/SAVP” 26 profiles in SDP offer/answer. MCPTT clients shall not reject an SDP offer due to offered RTP profile being either “RTP/AVP” or “RTP/SAVP”. MCPTT clients may, based on operator / MCPTT service provider policy, offer
45、 either “RTP/AVP” or “RTP/SAVP” RTP profiles. MCPTT clients 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, addition
46、ally offer a payload type with the EVS codec in SWB mode. 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 MCPTT clients shall support both
47、 RTP 24 and SRTP 26 media transport. An MCPTT client shall understand the payload formats and options as defined in RFC 4867 23. 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. T
48、he following payload format options from RFC 4867 are defined as follows to ensure minimum interoperability: - bandwidth-efficient shall be supported - mode-set: shall support all modes and shall offer no particular mode set ETSI ETSI TS 126 179 V14.0.0 (2017-04)83GPP TS 26.179 version 14.0.0 Releas
49、e 14- 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-neighbor: 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 suppor
