1、 ETSI TS 126 110 V15.0.0 (2018-07) Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); Codec for circuit switched multimedia telephony service; General description (3GPP TS 26.110 version 15.0.0 Release 15) TECHNICAL SPECIFICATION GLOBAL SY
2、STEM FOR MOBILE COMMUNICATIONSRETSI ETSI TS 126 110 V15.0.0 (2018-07)13GPP TS 26.110 version 15.0.0 Release 15Reference RTS/TSGS-0426110vf00 Keywords GSM,UMTS 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
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9、re trademarks registered and owned by the GSM Association. ETSI ETSI TS 126 110 V15.0.0 (2018-07)23GPP TS 26.110 version 15.0.0 Release 15Intellectual Property Rights Essential patents IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The information p
10、ertaining 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 Sec
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13、g the property of ETSI, and conveys no right to use or reproduce any trademark and/or tradename. Mention of those trademarks in the present document does not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks. Foreword This Technical Specificati
14、on (TS) has been produced by ETSI 3rd Generation Partnership 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. T
15、he 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 “shall“, “shall not“, “should“, “should not“, “may“, “need not“, “will“, “will not“, “can“ and “cannot“ are to be interpreted as
16、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 used in direct citation. ETSI ETSI TS 126 110 V15.0.0 (2018-07)33GPP TS 26.110 version 15.0.0 Release 15Contents Intellectual Pro
17、perty Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 4g3Introduction 4g31 Scope 5g32 References 5g33 Definitions and abbreviations . 6g33.1 Definitions 6g33.2 Abbreviations . 6g34 General . 7g35 ITU-T H.324 . 7g36 Modifications to H.324 (3GPP TS 26.111) 8g37 Call set-up requirements .
18、 8g38 Terminal implementors guide (3GPP TR 26.911) . 8g3Annex A (informative): Background information . 9g3A.1 Video I/O Equipment . 9g3A.2 Video Codec . 9g3A.2.1 H.261 10g3A.2.2 H.263 10g3A.2.3 MPEG-4 . 10g3A.3 Audio I/O Codec 10g3A.4 Speech Codec . 10g3A.4.1 3GPP AMR 10g3A.4.2 G.723.1 . 11g3A.5 Us
19、er Data Applications 11g3A.5.1 Data conferencing T.120 11g3A.5.2 Text conversation T.140 . 11g3A.6 Data Protocols 12g3A.7 System Control . 12g3A.8 Call Set-up 12g3A.9 H.245 12g3A.10 H.223 12g3A.10.1 Level 0 13g3A.10.2 Level 1 13g3A.10.3 Level 2 13g3A.10.4 Level 3 13g3Annex B (informative): Bibliogra
20、phy . 14g3Annex C (informative): Change history . 15g3History 16 ETSI ETSI TS 126 110 V15.0.0 (2018-07)43GPP TS 26.110 version 15.0.0 Release 15Foreword This Technical Specification has been produced by the 3GPP. The present document introduces the set of specifications which apply to 3G-324M multim
21、edia terminals 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 an i
22、ncrease in version number as follows: Version 3.y.z where: x the first digit: 1 presented to TSG for information; 2 presented to TSG for approval; 3 Indicates TSG approved document under change control. y the second digit is incremented for all changes of substance, i.e. technical enhancements, corr
23、ections, updates, etc. z the third digit is incremented when editorial only changes have been incorporated in the specification; Introduction This document contains a specification for H.324 based multimedia codecs for circuit switched 3GPP networks. The term codec is usually associated with a singl
24、e media type. However, many multimedia services require a close integration of disparate media types. In this sense, the representations of these media types (in the form of media streams) are at least logically bound into a single multimedia stream. As such, a H.324 based multimedia codec must hand
25、le multiplexing/de-multiplexing and skew. It will also have to provide codecs for each of the derived media streams. End-to-end, in-band control is also required for the purposes of configuration and establishing individual media streams. Finally, since 3GPP networks are inherently error prone, erro
26、r detection and/or correction must also be provided by the multimedia codec since it has a comprehensive view of the bit stream it produces and therefore can apply the most efficient form of error detection and/or correction. ETSI ETSI TS 126 110 V15.0.0 (2018-07)53GPP TS 26.110 version 15.0.0 Relea
27、se 151 Scope This specification introduces the set of specifications which apply to 3G-324M multimedia terminals. 2 References The following documents contain provisions which, through reference in this text, constitute provisions of the present document. - References are either specific (identified
28、 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 the case of a reference to a 3GPP document (including a GSM document), a non-specific referenc
29、e implicitly refers to the latest version of that document in the same Release as the present document. 1 ITU-T Recommendation H.223: “Multiplexing protocol for low bitrate multimedia communication“ 2 ITU-T Recommendation H.223 Annex A: “Multiplexing protocol for low bitrate multimedia communication
30、 over low error-prone channels“ 3 ITU-T Recommendation H.223 Annex B: “Multiplexing protocol for low bitrate multimedia communication over moderate error-prone channels“ 4 ITU-T Recommendation H.223 Annex C: “Multiplexing protocol for low bitrate multimedia communication over highly error-prone chan
31、nels“ 5 ITU-T Recommendation H.223 Annex D: “Optional multiplexing protocol for low bitrate multimedia communication over highly error-prone channels“ 6 ITU-T Recommendation H.245: “Control protocol for multimedia communication“ 7 ITU-T Recommendation G.723.1: “Dual rate speech coder for multimedia
32、communication transmitting at 5.3 General Description“ 16 3GPP TS 26.090: “Mandatory Speech Codec; Speech Transcoding Functions“ 17 3GPP TS 26.073: “Mandatory Speech Codec; ANSI C-Code“ 18 ITU-T T.140 (1998) Presentation protocol for text conversation application. 19 3GPP TS 22.226: “Global Text Tel
33、ephony; Stage 1“ 20 3GPP TS 24.008: “Mobile Radio Interface - Layer 3 MM/CC Specification“. ETSI ETSI TS 126 110 V15.0.0 (2018-07)63GPP TS 26.110 version 15.0.0 Release 1521 3GPP TS 27.001: “General on Terminal Adaptation Functions (TAF) for Mobile Stations (MS)“. 22 3GPP TS 29.007: “General require
34、ments on interworking between the Public Land Mobile Network (PLMN) and the Integrated Services Digital Network (ISDN) or Public Switched Telephone Network (PSTN)“. 23 3GPP TS 23.108: “Mobile radio interface layer 3 specification; Core Network protocols; stage 2“. 24 ITU-T Recommendation G.712: “Tra
35、nsmission performance characteristics of pulse code modulation channels“. 25 ITU-T Recommendation T.120: “Data protocols for multimedia conferencing“. 3 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the following terms and definitions apply. H.324 terminal:
36、ITU-T H.324 recommendation, including Annex C 3G-324M terminal: Based on ITU-T H.324 recommendation modified by 3GPP for purposes of 3GPP circuit switched network based video telephony 3.2 Abbreviations For the purposes of the present document, the following abbreviations apply: ACELP Algebraic-Code
37、-Excited Linear-Prediction ADC Analogue Digital Converter AEC Acoustic Echo Cancellation AL Adaptation Layer CCSRL Control Channel Segmentation and Reassembly Layer CELP Code-Excited Linear-Prediction CT Correlation Threshold DAC Digital Analogue Converter DCT Discrete Cosine Transformation EI Error
38、 Indication EOB End Of Block FEC Forward Error Correction GOB Group Of Blocks GQUANT Group Quantizer information GTT Global Text Telephony HDLC High-Level Data Link Control HEC Header Error Control ISDN Integrated Services Digital Network LAPM Link Access Procedure for Modems LC Logical Channel MC M
39、ultiplex CodeMCU Multipoint Communication Unit MP-MLQ Multipulse Maximum Likelihood Quantization MPL Multiplex Payload Length MR-ACELP Multi-rate ACELP PC Personal ComputerMCU Multipoint Conference Unit MUX H.223 Multiplex layer PDU Protocol Data Unit SN Sequence Number VLC Variable Length Code ETSI
40、 ETSI TS 126 110 V15.0.0 (2018-07)73GPP TS 26.110 version 15.0.0 Release 154 General 3G-324M terminals provide real-time video, audio, or data, in any combination, including none, over 3GPP circuit-switched, radio networks. They are based on ITU-T H.324 with Annex C, and Annex H when mobile multilin
41、k operation is supported. Communication may be either 1-way or 2-way. Such terminals may be part of a portable device or integrated into an automobile or other non fixed location device. They may also be fixed, stand-alone devices; for example, a video telephone or kiosk. 3G-324M terminals may also
42、be integrated into PCs and workstations. In addition to 3G-324M to 3G-324M communication, interoperation with other types of multimedia telephone terminals is possible, however a gateway may be required. Multipoint communication between more than two 3G-324M terminals is possible using a Multipoint
43、Communication Unit (MCU). MCU functionality is for further study. 3G-324M terminals are based on ITU-T H.324 with Annex C, and Annex H when mobile multilink operation is supported. For performance reasons and to reference the call set-up procedures, some modifications to H.324 were made. These are d
44、escribed in 3GPP TS 26.111, except call set-up procedures are described in 3GPP TS 24.008, 27.001, 29.007 and 23.108. 3G-324M terminals shall conform to these specifications. Because of the many options in H.324, an implementors guide, 3GPP TR 26.911, provides preferred options for 3G-324M implement
45、ations. Figure 1 below shows the functional components of a generic 3GPP multimedia terminal. The video, speech, data and multilink components are optional. If a media type is supported, the standards indicated are mandatory except those enclosed in square brackets are optional. Figure 1 Scope of ci
46、rcuit switched multimedia 3GPP specification. Items in brackets are optional. Short descriptions of ITU-T H.324, 3GPP TS 26.111, and 3GPP TR 26.911 are given below. 5 ITU-T H.324 ITU-T H.324 describes terminals for low bitrate multimedia communication. That ITU-T recommendation contains “ANNEX C, Mu
47、ltimedia Telephone Terminals Over Error Prone Channels“ (sometimes referred to as H.324/M) and “ANNEX H, Mobile Multilink Operation“. These annexes are considered an integral part of the recommendation. 3GPP TS 26.111 Video I/O Equipment Video Codec H.263, MPEG-4, H.261 Audio I/O Equipment Speech Co
48、dec 3GPP-AMR, G.723.1 Optional Receive Path Delay Multiplex/ Demultiplex H.223, H.223 Annex A, H.223 Annex B, H.223 Annex C, H.223 Annex D User Data Applications T.120, Data Protocols V.14, LAPM, System Control H.245 3GPP Network CCSRL NSRPLAPM/V.42 Call Set-up OptionalMultilink H.324 Annex H ETSI E
49、TSI TS 126 110 V15.0.0 (2018-07)83GPP TS 26.110 version 15.0.0 Release 15Therefore, herewith H.324 shall mean ITU-T H.324 with Annex C. When multilink operation is utilized, H.324 shall also mean to include H.324 Annex H. Originally designed for V.34 modems, H.324 now supports ISDN and wireless networks. Therefore, it is well suited as a basis for 3GPP multimedia codecs. Relevant to wireless networks, H.324 describes the overall system architecture and introduces control (H.245), mux (H.223), video (H.261 an
