1、 ETSI TS 126 281 V15.0.0 (2018-07) LTE; Mission Critical Video (MCVideo); Codecs and media handling (3GPP TS 26.281 version 15.0.0 Release 15) TECHNICAL SPECIFICATION ETSI ETSI TS 126 281 V15.0.0 (2018-07)13GPP TS 26.281 version 15.0.0 Release 15Reference RTS/TSGS-0426281vf00 Keywords LTE ETSI 650 R
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13、an endorsement by ETSI of products, services or organizations associated with those trademarks. 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 ident
14、ities, 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 documen
15、t “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 the expression of provisions). “must“ and “must not“ are NOT allowed in ETSI deliverables except whe
16、n used in direct citation. ETSI ETSI TS 126 281 V15.0.0 (2018-07)33GPP TS 26.281 version 15.0.0 Release 15Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 4g3Introduction 4g31 Scope 5g32 References 5g33 Definitions and abbreviations . 5g33.1 Definitions 5g
17、33.2 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 . 8g3History 9g3ETSI ETSI TS 126 281 V15.0.0 (2018-07)43GPP TS 26.281 version 15.0.0 Release 15Foreword
18、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 following formal TSG approval. Should the TSG modify the contents of the present document, it will be re-r
19、eleased 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 TSG for approval; 3 or greater indicates TSG approved document under change control. y the second dig
20、it 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 document. Introduction Requirements for codecs and media handling in support of the Mission Critical Vide
21、o (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 the permission to talk in an arbitrated manner. The MCVideo service also supports private calls betwe
22、en 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 V15.0.0 (2018-07)53GPP TS 26.281 version 15.0.0 Release 151 Scope The present document specifies the codecs and media handling
23、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 requirements common to multiple mission critical services have been specified in 3GPP TS 22.280 2. Th
24、e 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 aspects common to multiple mission critical services have been specified in 3GPP TS 23.280 4. 2 Refere
25、nces 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 specific reference, subsequent rev
26、isions 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 document. 1 3GPP TR 21.905:
27、“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 architecture to support mission critical services; Stage 2“. 5 3GPP TS 23.281: “Functional architecture a
28、nd 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 Mission Critical Push To Talk (MCPTT) over LTE“. 8 IETF RFC 3550 (2003): “RTP: A Transport Protocol for Rea
29、l-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 Definitions For the purposes of the present document, the terms and definitions given in 3GPP TR 21.905 1
30、 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 denoting the vertical resolution; all 240 lines are drawn in each frame. 720p: “720 progressive“- video reso
31、lution denoting the vertical resolution; all 720 lines are drawn in each frame. 1080p: “1080 progressive“ -video resolution denoting the vertical resolution; all 1080 lines are drawn in each frame. ETSI ETSI TS 126 281 V15.0.0 (2018-07)63GPP TS 26.281 version 15.0.0 Release 15MCVideo client: The MCV
32、ideo client functional entity acts as the user agent for all MCVideo application transactions. MCVideo Service: A video communication service supporting applications for mission critical organizations and mission critical applications for other businesses and organizations (e.g., utilities, railways
33、) 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 authorized to MCVideo services via an MCVideo UE. Mission Critical: Quality or characteristic of a c
34、ommunication 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 security and priority and pre-emption handling. Mission Critical Applications: Generic communication ap
35、plications 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 the present document, the abbreviations given in 3GPP TR 21.905 1 and the following apply. An abbrevia
36、tion 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 second GCS Group Communication Service HEVC High Efficiency Video Coding MBMS Multimedia Broadcast/Mu
37、lticast 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-Time Transport Control Protocol SRTP Secure Real-Time Transport Protocol UC Unicast 4 Codecs and media h
38、andling 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 and decoding of at least 240p. MCVideo clients may support video encoding and decoding up to 720p. Mo
39、re 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 should support video decoding via H.264 (AVC) Constrained High Profile (CHP) Level 3.1. Transmitting
40、 capable MCVideo clients may also support variable rate video encoding from 10fps to 30fps and 240p to 1080p. Receiving 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. ETSI ETSI TS 126 281 V15.0.0 (20
41、18-07)73GPP TS 26.281 version 15.0.0 Release 15Based on operator / MCVideo service provider policy, the MCVideo service may optionally and additionally support the H.265 (HEVC) codec. If MCVideo services support the H.265 (HEVC) codec then MCVideo clients should additionally support encoding and dec
42、oding 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 MCVideo clients may support decoding of H.265 (HEVC) Main Profile, Main Tier, Level 4 with resolutions
43、 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 lossless mode. 4.1.2 Audio codec In cases where the MCVideo service supports combined or separate ha
44、ndling 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 SRTP 8, 10 media transport. ETSI ETSI TS 126 281 V15.0.0 (2018-07)83GPP TS 26.281 version 15.0.0 Rel
45、ease 15Annex A (informative): Change history Change history Date Meeting TDoc CR Rev Cat Subject/Comment New version 2017-03 75 Version 14.0.0 14.0.0 2018-06 80 Version 15.0.0 15.0.0 ETSI ETSI TS 126 281 V15.0.0 (2018-07)93GPP TS 26.281 version 15.0.0 Release 15History Document history V15.0.0 July 2018 Publication
