1、ETSI TS I01 329-2 2.1.3(2002-01) Technical Specificafion Telecommunications and Internet Protocol Harmonization Over Networks (TIPHON) Release 3; End-to-end Quality of Service in TIPHON systems; Part 2: Definition of speech Quality of Service (QoS) classes 2 ETSI TS 101 329-2 V2.1.3 (2002-01) Refere
2、nce RTS/TI PHON-050 1 2 b Keywords E-Model, internet, IP, network, quality, service, te lep h o n y ETSI 650 Route des Lucioles F-O6921 Sophia Antipolis Cedex - FRANCE Tel.: +33 4 92 94 42 O0 Fax: +33 4 93 65 47 16 Siret No 348 623 562 00017 - NAF 742 C Association but non lucratif enregistre la Sou
3、s-prfecture de Grasse (06) No 7803/88 Important notice Individual copies of the present document can be downloaded from: http:l/w.etsi .orq The present document may be made available in more than one electronic version or in print. In any case of existing or perceived difference in contents between
4、such versions, the reference version is the Portable Document Format (PDF). In case of dispute, the reference shall be the printing on ETSI printers of the PDF version kept on a specific network drive within ETSI Secretariat. Users of the present document should be aware that the document may be sub
5、ject to revision or change of status. Information on the current status of this and other ETSI documents is available at 3 If you find errors in the present document, send your comment to: Cori vriaht Notifica tion No part may be reproduced except as authorized by written permission. The copyright a
6、nd the foregoing restriction extend to reproduction in all media. O European Telecommunications Standards Institute 2002. All rights reserved. ETSI 3 ETSI TS 101 329-2 V2.1.3 (2002-01) Contents Intellectual Property Rights 4 Foreword . 4 Introduction 5 1 2 3 3.1 3.2 4 5 5.1 5.2 5.3 Scope 6 Reference
7、s 6 Definitions and abbreviations . 6 Definitions . . 6 Abbreviations . 7 Definition of TIPHON Speech QoS classes . 7 TIPHON speech QoS performance metrics . 7 . 8 . 8 Overall transmission quality rating . Listener speech quality of TIPHON systems . End-to-end delay . . 9 Annex A (informative): Bibl
8、iography . 10 History 11 ETSI 4 ETSI TS 101 329-2 V2.1.3 (2002-01) Intellectual Property Rights IPRs 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-m
9、embers, and can be found in ETSI SR O00 314: “Intellectual Property Rights (7PRs); Essential, orpotentially Essential, IPRs notlJied to ETSI in respect ofETSI standards“, which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (5). Pursuant to the ETSI IPR P
10、olicy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee can be given as to the existence of other IPRs not referenced in ETSI SR O00 3 14 (or the updates on the ETSI Web server) which are, or may be, or may become, essential to the present document. Foreword This
11、Technical Specification (TS) has been produced by ETSI Project Telecommunications and Internet Protocol Harmonization Over Networks (TIPHON). The present document is part 2 of a multi-part deliverable covering End-to-end Quality of Service in TIPHON systems, as identified below: TR 101 329-1: TS 101
12、 329-2: TS 101 329-3: TS 101 329-5: TR 101 329-6: “General aspects of Quality of Service (QoS)“; “Definition of speech Quality of Service (QoS) classes“; “Signalling and control of end-to-end Quality of Service (QoS)“; “Quality of Service (QoS) measurement methodologies“; “Actual measurements of net
13、work and terminal characteristics and performance parameters in TIPHON networks and their influence on voice quality“; “Design guide for elements of a TIPHON connection from an end-to-end speech transmission performance point of view“. TR 101 329-7: Quality of Service aspects of TIPHON Release 4 and
14、 5 Systems will be covered in TS 102 024 and TS 102 025 respectively (see Bibliography), and more comprehensive versions of the Release 3 documents listed above will be published as part of Release 4 and 5 as work progresses. ETSI 5 ETSI TS 101 329-2 V2.1.3 (2002-01) I n t rod uct ion The present do
15、cument forms one of a series of technical specifications and technical reports produced by TIPHON Working Group 5 addressing Quality of Service (QoS) in TIPHON Systems The structure of this work is illustrated in figure 1. Introduction Definition of 5 Speech Classes TR 101 329-1 General Aspects of Q
16、oS TS 101 329-2 Speech QoS Classes f GenericQoS Specific Aspects of QoS TS 101 329-3 QoS Control TS 101 329-5 Measure- ment Methods QoS signalling requirements Measurement methodologies TR 101 329-6 Actual Test Results Repository of real test results TR 101 329-7 Design Guidelines Useful info for de
17、signers Figure 1: Structure of TIPHON QoS Documentation for Release 3 ETSI 6 ETSI TS 101 329-2 V2.1.3 (2002-01) 1 Scope The present document defines five classes of Quality of Service for characterizing the speech performance of TIPHON compliant IP voice telephony networks. The classes of service ap
18、ply to all the defined TIPHON Scenarios and are specified in terms of the following parameters: - “Overall transmission quality rating“; - - “End-to-end delay“. “Listener speech quality“ (one-way non-interactive speech quality); and 2 Re fe re nces The following documents contain provisions which, t
19、hrough reference in this text, constitute provisions of the present document. References are either specific (identified by date of publication andor edition number or version number) or non-specific. For a specific reference, subsequent revisions do not apply. For a non-specific reference, the late
20、st version applies. il ETSI EN 300 961: “Digital cellular telecommunications system (Phase 2+) (GSM); Full rate speech; Transcoding (GSM 06.10 version 7.0.2 Release 1998)“. ETSI EN 300 726: “Digital cellular telecommunications system (Phase 2+) (GSM); Enhanced Full Rate (EFR) speech transcoding (GSM
21、 06.60 version 7.0.2 Release 1998)“. ETSI TS 101 329-5: “Telecommunications and Internet protocol Harmonization Over Networks (TIPHON) Release 3; Technology Compliance Specification; Part 5: Quality of Service (QoS) measurement methodologies“. ITU-T Recommendation G. 107: “The E-Model, a computation
22、al model for use in transmission planning“. ITU-T Recommendation G. 109: “Definition of categories of speech transmission quality“ ITU-T Recommendation G.711: “Pulse code modulation (PCM) of voice frequencies“. ITU-T Recommendation G.726: “40,32,24, 16 kbit/s Adaptive Differential Pulse Code Modulat
23、ion (ADPCM)“. ITU-T Recommendation P.3 10: “Transmission characteristics for telephone-band (300-3 400 Hz) digital telephones“. 21 31 41 51 61 71 SI 3 Definitions and abbreviations 3.1 De fi nit ions For the purposes of the present document, the following terms and definitions apply: codec: combined
24、 speech encoder and decoder ETSI 7 3.2 Abbreviations ETSI TS 101 329-2 V2.1.3 (2002-01) For the purposes of the present document, the following abbreviations apply: EFR FR GSM IP ITU ITU-7 PSTN QOS Enhanced Full Rate Full Rate Global System for Mobile communications Internet Protocol International T
25、elecommunication Union ITU Telecommunication Standardization Sector (former CCITT) Public Switched Telephone Network Quality of Service 4 Definition of TIPHON Speech QoS classes Three classes of end-to-end speech QoS are defiied for TIPHON systems. The following TIPHON speech QoS classes are defined
26、 from mouth-to-ear and therefore include both the network and the TIPHON terminal characteristics: WIDEBAND: This is a type of IP telephony service will provide a user experience better than the PSTN. It is expected that these systems will be implemented using wideband codecs (codecs encoding analog
27、ue signals with bandwidth in excess of 3,l kHz) and QoS-engineered IP networks; NARROWBAND: This is a type of IP telephony service will provide a user experience similar to PSTN. It is expected that such systems would also be implemented over QoS-engineered IP networks: - NARROWBAND/HIGH: This quali
28、ty is equivalent to recent ISDN services; - NARROWBANDMEDIUM: This quality is equivalent to recent wireless mobile telephony services in good radio conditions, for instance GSM networks using EFR codecs 2, or systems using G.726 at 32 kbit/s 7 codecs; - NARROWBAND/ACCEPTABLE: This quality is equival
29、ent to common wireless mobile telephony services, for instance GSM networks using FR codecs 11 or systems including a geostationary satellite. BEST EFFORT: This type of service will provide a usable communications service but will not provide guarantees of performance. There may be periods of signif
30、icantly impaired speech quality, and large end-to-end delays which are likely to impact the overall conversational interactivity. It is expected such communications will operate over non QoS-engineered IP networks such as the public Internet. The TIPHON speech QoS classes WIDEBAND and NARROWBAND wil
31、l provide performance guarantees for 95 % of all connections. The BEST EFFORT class provides no speech performance guarantees. 5 TIPHON speech QoS performance metrics Each of the classes defined in clause 4 is specified by three performance metrics: Overall Transmission Quality Rating (R); Listener
32、Speech Quality (One-way non-interactive end-to-end Speech Quality); and End-to-end (mean one-way) Delay. To comply with a specific speech QoS class a TIPHON system shall meet the limits of “Overall Transmission Quality Rating R“given in table 1. In addition the limits of “End-to-end Delay“ and “List
33、ener Speech Quality“ given in tables 3 and 4 respectively shall be met in the very same class. NOTE: The measurement of “Overall Transmission Quality Rating (R)“, “Listener Speech Quality“ and “End-to-end Delay“ are described in TS 101 329-5 3. ETSI 8 Overall Transmission Quality Rating (R) ETSI TS
34、101 329-2 V2.1.3 (2002-01) 3 2 (NARROWBAND) 1 (Wi DEBAN D) 2H 2M 2A (BEST EFFORT) (HIGH) (MEDIUM) (ACCEPTABLE) (see note 2) 80 70 50 50, (see note 3) 5.1 Overall transmission quality rating Overall Transmission Quality Rating Users satisfaction Overall transmission quality rating (R) describes the f
35、ull acoustic-to-acoustic (mouth to ear) quality, experienced by an average user, for a typical situation using a “standard“ telephony handset. The overall transmission quality rating is calculated using the E-Model (ITU-T Recommendation G. 107 4). For calculation purposes the use of traditional tele
36、phone handsets (ITU-T Recommendation P.3 10 SI) at both sides of the connection is assumed. 90aRc 100 70 a R c 80 Very satisfied Satisfied Some users Many users Nearly all users 80 a R c 90 60 a R c 70 50 a R c 60 dissatisfied dissatisfied dissatisfied Table 1: Overall transmission quality Rating (R
37、) for TIPHON systems 3 (Wi DEBAN D) 2 (NARROWBAND) 1 (BEST EFFORT) 2H 2M 2A The relation between overall transmission quality rating (R) and user perception of quality is defined in ITU-T Recommendation G. 109 5. Table 2 is extracted from this recommendation. Res u Itan t Ove ral I Transmission Qual
38、ity Rating (R) Table 2: Categories of speech transmission quality as defined in ITU-T 32 kbitk 7 n.a. 86 73 50 50 5.2 Listener speech quality of TIPHON systems Specifications of listener speech quality for TIPHON QoS classes are given in table 3. Table 3: Listener speech quality of TIPHON systems Re
39、lative Speech Quality (one way, non interactive speech quality) Better than G.711 6 (HIGH) (MEDIUM) better than or better ITU-T G.726 at ETSI 9 3 2 (NARROWBAND) (Wi DEBAN D) 2H 2M 2A (HIGH) (MEDIUM) (ACCEPTABLE) En d-to-e n d De lay c 100 ms c 100 ms c 150 ms c 400 ms ETSI TS 101 329-2 V2.1.3 (2002-
40、01) 1 (BEST EFFORT) c 400 ms 5.3 End-to-end delay Specifications of end-to-end (mean one-way) delay for TIPHON QoS classes are given in table 4. Table 4: End-to-end delay for TIPHON Systems ETSI 10 ETSI TS 101 329-2 V2.1.3 (2002-01) Annex A (informative): Bibliography ETSI TS 102 024: TIPHON Release 4 QoS documents. ETSI TS 102 025: TIPHON Release 5 QoS documents. ETSI 11 ETSI TS 101 329-2 V2.1.3 (2002-01) vl.l.l v2.1.1 v2.1.2 V2.1.3 History July 2000 Publication (Historical) June 2001 Publication (Withdrawn) July 200 1 Publication Janbuary 2002 Publication ETSI
