1、 ETSI TS 126 281 V14.0.0 (2017-04) LTE; Mission Critical Video (MCVideo); Codecs and media handling (3GPP TS 26.281 version 14.0.0 Release 14) TECHNICAL SPECIFICATION ETSI ETSI TS 126 281 V14.0.0 (2017-04)13GPP TS 26.281 version 14.0.0 Release 14Reference DTS/TSGS-0426281ve00 Keywords LTE ETSI 650 R
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9、l 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 potentially
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11、tee 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 Project
12、 (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 can b
13、e 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 forms for
14、 the expression of provisions). “must“ and “must not“ are NOT allowed in ETSI deliverables except when used in direct citation. ETSI ETSI TS 126 281 V14.0.0 (2017-04)33GPP TS 26.281 version 14.0.0 Release 14Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword .
15、4g3Introduction 4g31 Scope 5g32 References 5g33 Definitions and abbreviations . 5g33.1 Definitions 5g33.2 Abbreviations . 6g34 Codecs and media handling for MCVideo . 6g34.1 MCVideo client 6g34.1.1 Codec 6g34.1.2 Audio codec 7g34.1.3 User plane protocol . 7g3Annex A (informative): Change history . 8
16、g3History 9g3ETSI ETSI TS 126 281 V14.0.0 (2017-04)43GPP TS 26.281 version 14.0.0 Release 14Foreword This Technical Specification has been produced by the 3rdGeneration Partnership Project (3GPP). The contents of the present document are subject to continuing work within the TSG and may change follo
17、wing 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.z where: x the first digit: 1 presented to TSG for information; 2 presented to
18、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 digit is incremented when editorial only changes have been incorporated in the docu
19、ment. Introduction Requirements for codecs and media handling in support of the Mission Critical Video (MCVideo) service are contained in the present document. The MCVideo service supports video communication between several users (i.e. group call), where each user has the ability to gain access to
20、the permission to talk in an arbitrated manner. The MCVideo service also supports private calls between two users. The MCVideo architecture is based on the functional architecture for mission critical communication services defined in 3GPP TS 23.280 4. ETSI ETSI TS 126 281 V14.0.0 (2017-04)53GPP TS
21、26.281 version 14.0.0 Release 141 Scope The present document specifies the codecs and media handling for MCVideo. The requirements for MCVideo are specified by SA1 in two technical specifications: a. The requirements specific to Mission Critical Video have been specified in 3GPP TS 22.281 3. b. The
22、requirements common to multiple mission critical services have been specified in 3GPP TS 22.280 2. The architectural work for MCVideo is specified by SA6 in two technical specifications: a. architectural and feature work specific to MCVideo have been specified in 3GPP TS 23.281 5. b. architectural a
23、spects common to multiple mission critical services have been specified in 3GPP TS 23.280 4. 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 publicati
24、on, 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 the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers t
25、o 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 22.280: “Mission Critical Services Common Requirements“. 3 3GPP TS 22.281: “Mission Critical Video over LTE“. 4 3GPP TS 23.280: “Common functional arch
26、itecture to support mission critical services; Stage 2“. 5 3GPP TS 23.281: “Functional architecture and information flows to support Mission Critical Video (MCVideo); Stage 2“. 6 3GPP TS 26.179: “Mission Critical Push To Talk (MCPTT); Codecs and media handling“. 7 3GPP TS 33.179: “Security of Missio
27、n Critical Push To Talk (MCPTT) over LTE“. 8 IETF RFC 3550 (2003): “RTP: A Transport Protocol for Real-Time Applications“. 9 IETF RFC 3711 (2004): “The Secure Real-time Transport Protocol (SRTP)“. 10 IETF RFC 6184 (2011): “RTP Payload Format for H.264 Video“. 3 Definitions and abbreviations 3.1 Defi
28、nitions 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 the present document takes precedence over the definition of the same term, if any, in 3GPP TR 21.905 1. 240p: “240 progressive“ - video resolution denotin
29、g the vertical resolution; all 240 lines are drawn in each frame. ETSI ETSI TS 126 281 V14.0.0 (2017-04)63GPP TS 26.281 version 14.0.0 Release 14720p: “720 progressive“- video resolution denoting the vertical resolution; all 720 lines are drawn in each frame. 1080p: “1080 progressive“ -video resolut
30、ion denoting the vertical resolution; all 1080 lines are drawn in each frame. MCVideo client: The MCVideo client functional entity acts as the user agent for all MCVideo application transactions. MCVideo Service: A video communication service supporting applications for mission critical organization
31、s and mission critical applications for other businesses and organizations (e.g., utilities, railways) with strong security, high availability, reliability and priority handling. MCVideo UE: An MC service UE that can be used to participate in MCVideo services. MCVideo User: An MC service user who is
32、 authorized to MCVideo services via an MCVideo UE. Mission Critical: Quality or characteristic of a communication activity, application, service or device, that requires low setup and transfer latency, high availability and reliability, ability to handle large numbers of users and devices, strong se
33、curity and priority and pre-emption handling. Mission Critical Applications: Generic communication applications with mission critical characteristics, traditionally encompassing push-to-talk voice (MCPTT), real-time video (MCVideo) and real-time data (MCData). 3.2 Abbreviations For the purposes of t
34、he present document, the abbreviations given in 3GPP 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. AVC Advanced Video Coding CHP Constrained High Profile fps frames per
35、second GCS Group Communication Service HEVC High Efficiency Video Coding MBMS Multimedia Broadcast/Multicast Service MC Mission Critical MCPTT Mission Critical Push-To-Talk MCVideo Mission Critical Video RTCP Real-Time Transport Control Protocol RTP Real-Time Transport Protocol SRTCP Secure Real-Tim
36、e Transport Control Protocol SRTP Secure Real-Time Transport Protocol UC Unicast 4 Codecs and media handling for MCVideo 4.1 MCVideo client 4.1.1 Codec MCVideo clients shall support the H.264 (AVC) codec as the mandatory universal interoperability codec. MCVideo clients shall support video encoding
37、and decoding of at least 240p. MCVideo clients may support video encoding and decoding up to 720p. More specifically: - Transmitting capable MCVideo clients should support video encoding via H.264 (AVC) Constrained High Profile (CHP) Level 3.1 up to 1280x72030fps. - Receiving capable MCVideo clients
38、 should support video decoding via H.264 (AVC) Constrained High Profile (CHP) Level 3.1. ETSI ETSI TS 126 281 V14.0.0 (2017-04)73GPP TS 26.281 version 14.0.0 Release 14Transmitting capable MCVideo clients may also support variable rate video encoding from 10fps to 30fps and 240p to 1080p. Receiving
39、capable MCVideo clients may also support H.264 (AVC) Constrained High Profile (CHP) Level 4 with resolutions up to 1080p and framerate up to 30fps. Based on operator / MCVideo service provider policy, the MCVideo service may optionally and additionally support the H.265 (HEVC) codec. If MCVideo serv
40、ices support the H.265 (HEVC) codec then MCVideo clients should additionally support encoding and decoding H.265 (HEVC). More specifically: - Transmitting capable MCVideo clients may support video encoding via H.265 (HEVC) Main Profile, Main Tier, Level 3.1 up to 1280x72030fps. - Receiving capable M
41、CVideo clients may support decoding of H.265 (HEVC) Main Profile, Main Tier, Level 4 with resolutions up to 1080p and framerate up to 30fps. - Transmitting capable MCVideo clients may also support H.265 encoding in lossless mode. - Receiving capable MCVideo clients may also support H.265 decoding in
42、 lossless mode. 4.1.2 Audio codec In cases where the MCVideo service supports combined or separate handling of video and audio streams 3, MCVideo clients may support the same codecs as for MCPTT in accordance with TS 26.179 6. 4.1.3 User plane protocol MCVideo clients shall support both RTP 7, 9 and
43、 SRTP 8, 10 media transport. ETSI ETSI TS 126 281 V14.0.0 (2017-04)83GPP TS 26.281 version 14.0.0 Release 14Annex A (informative): Change history Change history Date Meeting TDoc CR Rev Cat Subject/Comment New version 2017-03 SA#75 Version 14.0.0 14.0.0 ETSI ETSI TS 126 281 V14.0.0 (2017-04)93GPP TS 26.281 version 14.0.0 Release 14History Document history V14.0.0 April 2017 Publication
