1、 ETSI TR 102 521 V1.1.1 (2006-05)Technical Report Speech Processing, Transmission and Quality aspects (STQ);Support to TC EMTEL for QoS and Transmission Qualityaspects for end-to-end services ETSI ETSI TR 102 521 V1.1.1 (2006-05) 2 Reference DTR/STQ-00080 Keywords QoS, quality, speech, transmission
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3、e downloaded from: http:/www.etsi.org 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 such versions, the reference version is the Portable Document Format (PDF). In case of dispute, the re
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5、ts is available at http:/portal.etsi.org/tb/status/status.asp If you find errors in the present document, please send your comment to one of the following services: http:/portal.etsi.org/chaircor/ETSI_support.asp Copyright Notification No part may be reproduced except as authorized by written permis
6、sion. The copyright and the foregoing restriction extend to reproduction in all media. European Telecommunications Standards Institute 2006. All rights reserved. DECTTM, PLUGTESTSTM and UMTSTM are Trade Marks of ETSI registered for the benefit of its Members. TIPHONTMand the TIPHON logo are Trade Ma
7、rks currently being registered by ETSI for the benefit of its Members. 3GPPTM is a Trade Mark of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. ETSI ETSI TR 102 521 V1.1.1 (2006-05) 3 Contents Intellectual Property Rights4 Foreword.4 1 Scope 5 2 References 5
8、3 Definitions and abbreviations.6 3.1 Definitions6 3.2 Abbreviations .6 4 Quality of end-to-end services .7 4.1 End-to-end reference configuration7 4.2 Relationship between network performance and QoS8 4.3 Identification of QoS parameters and objectives8 5 Performance and quality objectives .9 5.1 N
9、etwork performance.9 5.2 Terminal equipment .10 5.3 Quality objectives.10 5.3.1 Services in general10 5.3.2 Voice services.11 5.4 Monitoring of network performance and QoS objectives 11 6 Conclusions 11 History 12 ETSI ETSI TR 102 521 V1.1.1 (2006-05) 4 Intellectual Property Rights IPRs essential or
10、 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 Esse
11、ntial, 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 (http:/webapp.etsi.org/IPR/home.asp). Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI.
12、 No guarantee 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 Report (TR) has been produced by ETSI Technical Committee Speech Proc
13、essing, Transmission and Quality Aspects (STQ). ETSI ETSI TR 102 521 V1.1.1 (2006-05) 5 1 Scope The present document provides basic information on the planning and provision of end-to-end services with respect to transmission quality. Network management, signalling and traffic engineering aspects ar
14、e out of the scope of the present document. The purpose of the present document is to describe the basic approach in order to identify QoS requirements and objectives for end-to-end services and to list critical technical aspects that have an influence on the resulting service quality. Also referenc
15、es to appropriate existing standards are given. Based on this information technical requirements and thresholds for the telecommunications network infrastructure and terminal equipment needed in order to support the desired end-to-end services can be derived. The present document takes into account
16、traditional circuit switched as well as packet switched technology. 2 References For the purposes of this Technical Report (TR), the following references apply: 1 ETSI EG 201 377-1: “Speech Processing, Transmission and Quality Aspects (STQ); Specification and measurement of speech transmission quali
17、ty; Part 1: Introduction to objective comparison measurement methods for one-way speech quality across networks“. 2 ETSI EG 201 377-2: “Speech Processing, Transmission and Quality Aspects (STQ); Specification and measurement of speech transmission quality; Part 2: Mouth-to-ear speech transmission qu
18、ality including terminals“. 3 ETSI EG 201 377-3: “Speech Processing, Transmission and Quality Aspects (STQ); Specification and measurement of speech transmission quality; Part 3: Non-intrusive objective measurement methods applicable to networks and links with classes of services“. 4 ETSI EG 202 057
19、-1: “Speech Processing, Transmission and Quality Aspects (STQ); User related QoS parameter definitions and measurements; Part 1: General“. 5 ETSI EG 202 057-2: “Speech Processing, Transmission and Quality Aspects (STQ); User related QoS parameter definitions and measurements; Part 2: Voice telephony
20、, Group 3 fax, modem data services and SMS“. 6 ETSI EG 202 057-3: “Speech Processing, Transmission and Quality Aspects (STQ); User related QoS parameter definitions and measurements; Part 3: QoS parameters specific to Public Land Mobile Networks (PLMN)“. 7 ETSI EG 202 057-4: “Speech Processing, Tran
21、smission and Quality Aspects (STQ); User related QoS parameter definitions and measurements; Part 4: Internet access“. 8 ETSI EG 202 086: “Speech Processing, Transmission and Quality Aspects (STQ); Objectives and principles for the transmission performance of multiple interconnected networks that ai
22、m to provide “traditional quality“ telephony services“. 9 ETSI TBR 038: “Public Switched Telephone Network (PSTN); Attachment requirements for a terminal equipment incorporating an analogue handset function capable of supporting the justified case service when connected to the analogue interface of
23、the PSTN in Europe“. 10 ETSI TR 102 430: “Speech Processing, Transmission and Quality Aspects (STQ); Basic Issues concerning the Quality of Speech over Packet Technology (both Internet and Next Generation Networks)“. 11 ITU-T Handbook on “Quality of Service and Network Performance“. 12 ITU-T Recomme
24、ndation G.101: “The transmission plan“. 13 ITU-T Recommendation G.109: “ Definition of categories of speech transmission quality“. ETSI ETSI TR 102 521 V1.1.1 (2006-05) 6 14 ITU-T Recommendation G.114: “One-way transmission time“. 15 ITU-T Recommendation G.131: “Talker echo and its control“. 16 ITU-
25、T Recommendation G.1000: “Communications Quality of Service: A framework and definitions“. 17 ITU-T Recommendation G.1010: “End-user multimedia QoS categories“. 18 ITU-T Recommendation I.350: “General aspects of quality of service and network performance in digital networks, including ISDNs“. 19 ITU
26、-T Recommendation P.300: “Transmission performance of group audio terminals (GATs) “. 20 ITU-T Recommendation P.310: “Transmission characteristics for telephone band (300-3400 Hz) digital telephones“. 21 ITU-T Recommendation P.311: “Transmission characteristics for wideband (150-7000 Hz) digital han
27、dset telephones“. 22 ITU-T Recommendation P.313: “Transmission characteristics for cordless and mobile digital terminals“. 23 ITU-T Recommendation P.330: “Speech processing devices for acoustic enhancement“. 24 ITU-T Recommendation P.340: “Transmission characteristics and speech quality parameters o
28、f hands-free terminals“. 25 ITU-T Recommendation P.341: “Transmission characteristics for wideband (150 7000 Hz) digital hands free telephony terminals“. 26 ITU-T Recommendation P.342: “Transmission characteristics for telephone band (300-3400 Hz) digital loudspeaking and hands-free telephony termin
29、als“. 27 ITU-T Recommendation P.1010: “Fundamental voice transmission objectives for VoIP terminals and gateways“. 28 ITU-T Recommendation Y.1541: “Network Performance Objectives for IP-based Services“. 29 ETSI SR 002 180: “ Requirements for communication of citizens with authorities/organizations i
30、n case of distress (emergency call handling)“. 3 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the terms and definitions given in SR 002 180 29 apply. 3.2 Abbreviations For the purposes of the present document, the following abbreviations apply. IP Internet
31、Protocol ITU-T International Telecommunications Union - Telecommunications sector QoS Quality of Service SMS Short Message Service TDM Time Division Multiplex TE Terminal EquipmentUNI User Network Interface VoIP Voice over Internet Protocol ETSI ETSI TR 102 521 V1.1.1 (2006-05) 7 4 Quality of end-to
32、-end services This clause provides a brief overview on general principles on how to assess the quality of end-to-end services. For any telecommunication service the infrastructure and the terminal equipment needs to investigated in order to identify essential quality aspects. These are influenced by
33、 technical parameters. Based on this information objectives for the technical performance of the telecommunications infrastructure and the implementation and monitoring of the services can be given. General information on QoS and its principles can be found in: - ITU-T Handbook 11 on Quality of Serv
34、ice and Network Performance. - ITU-T Recommendation G.1000 16. Examples of already defined QoS parameters for various services that can be used as a basis for setting up quality objectives are given in EG 202 057 (Part 1 to 4) 4 to 7. 4.1 End-to-end reference configuration The QoS of end-to-end serv
35、ices as perceived by the user is a result of the combined performance of different network components and terminal equipment. This is illustrated in the following figure (taken from ITU-T Recommendation G.101 12). G.101_F2UNITEAccess networkAccess networkTransit network(s)UNI-to-UNI connectionUNITEE
36、nd-to-end connection(Application of E-model)Figure 4.1: Reference configuration This reference configuration provides information on all relevant terminal, connection and transmission elements having an influence on the end-to-end performance of the connection. The performance is effected, i.e., deg
37、raded, by various kinds of impairments. They are identified and assessed by transmission parameters. Depending on the technology used for setting up the end-to-end connection, specific transmission impairments/parameters have to be taken into account. The combined influence of these transmission imp
38、airments determine the resulting end-to-end performance of the connection. In most cases the influence of the terminal equipment performance on the resulting QoS is out of the control of the service provider since the end users themselves are choosing and maintaining the equipment. However, the serv
39、ice provider can give recommendations for suitable terminals that will support good quality conditions. Normally the involved networks are under control of the service provider since either he is also the operator of the networks or he has service level agreements with the network operators he is di
40、rectly interconnected to. However if the service is provided over multiple connected networks of different operators there might be no continuous chain of responsibility for the end-to-end connection. In this cases there should be a regional, national or European transmission plan with general rules
41、 and requirements for the handling of calls over these networks. ETSI ETSI TR 102 521 V1.1.1 (2006-05) 8 4.2 Relationship between network performance and QoS Network performance contributes towards QoS as experienced by the user/customer. Network performance may or may not be on an end-to-end basis.
42、 The network performance is assessed by measuring technical parameters. The main difference between QoS and network performance is that QoS provides quality information on an end-to-end and service related basis, whereas network performance specifies the technical operativeness of network and termin
43、al elements or of network sections. ITU-T Recommendation I.350 18 provides the following conceptual categorization of Quality of Service (QoS) and Network Performance (NP) metrics as follows: Table 4.1 : Categorization of QoS and NP parameters Quality of Service parameter Network Performance paramet
44、er User oriented Network provider oriented Service related attributes Network element and technology related attributes Focus on user observable effects Focus on planning development (design), operations and maintenance Observed at service access points for the users, independent of network process
45、and events Observed at network connection element boundaries, e.g. relating to protocol specific interface signals While QoS and NP parameters are different in nature and serve different purposes, it is clear that there exist intrinsic relationships between QoS and NP parameters, one having a direct
46、 or indirect, and sometimes even inverse, influence on the other. Network performance parameters are used to measure objectively the performance of specific network and terminal elements that have an influence on the resulting end-to-end quality of a service. The measured performance can either be d
47、irectly (without any changes) transferred into a QoS statement or measured values of different parameters can be combined into a single QoS measure. When doing so the different focus of network parameters and the interfaces they are measured at have to be taken into account in order to map them corr
48、ectly to service related interfaces as seen by a user. 4.3 Identification of QoS parameters and objectives In order to identify the performance aspects and thus the quality criteria of an end-to-end service models are used. A common model that is used for the determination of performance criteria of
49、 a telecommunication service is the one shown in table 4.2. The objective of the model is to provide a structured approach to analyse the performance aspects in detail. The benefit of this model is that the quality criteria identified can be easily transferred into parameters since it is very detailed and close to the understanding of network performance parameters and management functions. Thus the definitions and measurement methods of the parameters can be expressed on commonly used and well understood te
