1、 International Telecommunication Union ITU-T E.802TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (02/2007) SERIES E: OVERALL NETWORK OPERATION, TELEPHONE SERVICE, SERVICE OPERATION AND HUMAN FACTORS Quality of telecommunication services: concepts, models, objectives and dependability planning Terms
2、 and definitions related to the quality of telecommunication services Framework and methodologies for the determination and application of QoS parameters ITU-T Recommendation E.802 ITU-T E-SERIES RECOMMENDATIONS OVERALL NETWORK OPERATION, TELEPHONE SERVICE, SERVICE OPERATION AND HUMAN FACTORS INTERN
3、ATIONAL OPERATION Definitions E.100E.103 General provisions concerning Administrations E.104E.119 General provisions concerning users E.120E.139 Operation of international telephone services E.140E.159 Numbering plan of the international telephone service E.160E.169 International routing plan E.170E
4、.179 Tones in national signalling systems E.180E.189 Numbering plan of the international telephone service E.190E.199 Maritime mobile service and public land mobile service E.200E.229 OPERATIONAL PROVISIONS RELATING TO CHARGING AND ACCOUNTING IN THE INTERNATIONAL TELEPHONE SERVICE Charging in the in
5、ternational telephone service E.230E.249 Measuring and recording call durations for accounting purposes E.260E.269 UTILIZATION OF THE INTERNATIONAL TELEPHONE NETWORK FOR NON-TELEPHONY APPLICATIONS General E.300E.319 Phototelegraphy E.320E.329 ISDN PROVISIONS CONCERNING USERS E.330E.349 INTERNATIONAL
6、 ROUTING PLAN E.350E.399 NETWORK MANAGEMENT International service statistics E.400E.404 International network management E.405E.419 Checking the quality of the international telephone service E.420E.489 TRAFFIC ENGINEERING Measurement and recording of traffic E.490E.505 Forecasting of traffic E.506E
7、.509 Determination of the number of circuits in manual operation E.510E.519 Determination of the number of circuits in automatic and semi-automatic operation E.520E.539 Grade of service E.540E.599 Definitions E.600E.649 Traffic engineering for IP-networks E.650E.699 ISDN traffic engineering E.700E.7
8、49 Mobile network traffic engineering E.750E.799 QUALITY OF TELECOMMUNICATION SERVICES: CONCEPTS, MODELS, OBJECTIVES AND DEPENDABILITY PLANNING Terms and definitions related to the quality of telecommunication services E.800E.809 Models for telecommunication services E.810E.844 Objectives for qualit
9、y of service and related concepts of telecommunication services E.845E.859 Use of quality of service objectives for planning of telecommunication networks E.860E.879 Field data collection and evaluation on the performance of equipment, networks and services E.880E.899 OTHER E.900E.999 For further de
10、tails, please refer to the list of ITU-T Recommendations. ITU-T Rec. E.802 (02/2007) i ITU-T Recommendation E.802 Framework and methodologies for the determination and application of QoS parameters Summary ITU-T Recommendation E.802 provides a framework and methodologies for the identification of Qo
11、S criteria relevant to users and guidelines for conversion of these criteria into QoS parameters that can be used to evaluate the QoS of telecommunication services. Guidelines are also given to obtain users QoS requirements and to prioritize the criteria or parameters. All these may be applied to se
12、rvices supported by the terrestrial and wireless legacy networks as well as services supported by the emerging IP network. Source ITU-T Recommendation E.802 was approved on 8 February 2007 by ITU-T Study Group 2 (2005-2008) under the WTSA Resolution 1 procedure. ii ITU-T Rec. E.802 (02/2007) FOREWOR
13、D The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff questions and issuing
14、 Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on these topics
15、. The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1. In some areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this Recommendation, the expression “A
16、dministration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain mandatory provisions (to ensure e.g. interoperability or applicability) and
17、compliance with the Recommendation is achieved when all of these mandatory provisions are met. The words “shall“ or some other obligatory language such as “must“ and the negative equivalents are used to express requirements. The use of such words does not suggest that compliance with the Recommendat
18、ion is required of any party. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or applicability of claim
19、ed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recomme
20、ndation. However, implementers are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2007 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, w
21、ithout the prior written permission of ITU. ITU-T Rec. E.802 (02/2007) iii CONTENTS Page 1 Scope 1 2 References. 2 3 Definitions 3 4 Abbreviations and acronyms 5 5 Conventions 5 6 Methodology for identification of QoS criteria and parameters. 5 6.1 General considerations . 5 6.2 Identification of us
22、ers QoS criteria 8 6.3 Conversion of QoS criteria to QoS parameters 12 6.4 Publication of QoS parameters. 13 6.5 Practical issues when using QoS parameters 14 7 Measurement of QoS parameters 14 7.1 Objective measurements. 15 7.2 Subjective measurements . 16 7.3 Who should perform the measurements. 1
23、6 8 Guidelines for defining quality objectives 17 8.1 General considerations . 17 8.2 Defining initial quality objectives 18 8.3 Defining target values. 18 8.4 Tuning quality objectives . 19 8.5 Verification of QoS objectives . 20 Appendix I References for the development of QoS metrics and examples
24、 of QoS parameters. 22 I.1 Examples of QoS parameters . 22 I.2 Development of QoS metrics . 23 Appendix II Quality objectives. 24 II.1 Voice telephony and voiceband services 24 II.2 Services over packet-based networks. 25 Appendix III Examples for the usage of the three models 27 III.1 Universal mod
25、el 27 III.2 Performance model. 28 III.3 Four-market model . 29 ITU-T Rec. E.802 (02/2007) 1 ITU-T Recommendation E.802 Framework and methodologies for the determination and application of QoS parameters 1 Scope This Recommendation provides a framework and methodologies for the identification of QoS
26、criteria relevant to users and guidelines for conversion of these criteria into QoS parameters that can be used to evaluate the QoS of telecommunication services. Guidelines are also given to obtain users QoS requirements and to prioritize the criteria or parameters. All these may be applied to serv
27、ices supported by the terrestrial and wireless legacy networks as well as services supported by the emerging IP network. These QoS criteria are primarily of interest to users and service providers. Those criteria which are of primary concern to the service/network providers (e.g., network performanc
28、e parameters that contribute to QoS and other performance criteria) to ensure the delivery of the required level of QoS to the user are not covered in this Recommendation. NOTE For information on performance measures from the service/network providers perspective, refer to ITU-T E.419 on key perform
29、ance indicators (KPI). The QoS criteria are based on the QoS Requirements of the User, one of the four viewpoints mentioned in Figure 1 of ITU-T G.1000. These criteria, with slight modifications, may be used for expressing the offered QoS, the delivered QoS and the perceived QoS as described in ITU-
30、T G.1000. The particular use/application of each of these four QoS viewpoints is given in clause 6.1.1. This Recommendation introduces three models for the identification of QoS criteria of any telecommunication service. All models or a combination of these models may be used for a particular servic
31、e to enable most, if not all, QoS criteria to be identified. For a particular purpose, a selection of QoS criteria may be chosen from the list of criteria identified. Guidelines are given on how to convert the identified criteria into measurable QoS parameters and on the adoption and measurement of
32、the parameters. The QoS parameters may be used for various purposes including: Specifying the level of quality of service in customer telecommunication service contracts or in the description of terms and conditions of the service. Comparing the level of quality and quality commitments of services o
33、f different service providers. Preparing long-term studies on the level of quality attributes of a specific service. Preparing statistics, reports and publications of the quality of a service. Regulatory purposes including specification of the minimum level of quality (e.g., for universal service, i
34、nterconnection regulations) and monitoring of services by, for example, reports on a regular basis and statistics for specific situations. Appendix I provides references for the development of QoS metrics and examples of QoS parameters. Appendix II gives quality objectives that are currently availab
35、le in standardization. Appendix III gives examples for the use of the three models for the identification of QoS criteria. 2 ITU-T Rec. E.802 (02/2007) 2 References The following ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provision
36、s of this Recommendation. At the time of publication, the editions indicated were valid. All Recommendations and other references are subject to revision; users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations a
37、nd other references listed below. A list of the currently valid ITU-T Recommendations is regularly published. The reference to a document within this Recommendation does not give it, as a stand-alone document, the status of a Recommendation. ITU-T E.419 ITU-T Recommendation E.419 (2006), Business or
38、iented key performance indicators for management of networks and services. ITU-T E.470 ITU-T Recommendation E.470 (2005), Operational considerations for QoS of voice over IP-based networks with PSTN-IP-PSTN architecture. ITU-T E.800 ITU-T Recommendation E.800 (1994), Terms and definitions related to
39、 quality of service and network performance including dependability. ITU-T G.1000 ITU-T Recommendation G.1000 (2001), Communications quality of service: A framework and definitions. ITU-T G.1010 ITU-T Recommendation G.1010 (2001), End-user multimedia QoS categories. ITU-T G.1020 ITU-T Recommendation
40、 G.1020 (2006), Performance parameter definitions for quality of speech and other voiceband applications utilizing IP networks. ITU-T G.1030 ITU-T Recommendation G.1030 (2005), Estimating end-to-end performance in IP networks for data applications. ITU-T G.1040 ITU-T Recommendation G.1040 (2006), Ne
41、twork contribution to transaction time. ITU-T G.1050 ITU-T Recommendation G.1050 (2005), Network model for evaluating multimedia transmission performance over Internet Protocol. ITU-T I.350 ITU-T Recommendation I.350 (1993), General aspects of quality of service and network performance in digital ne
42、tworks, including ISDNs. ITU-T O.211 ITU-T Recommendation O.211 (2006), Test and measurement equipment to perform tests at the IP layer. ITU-T Y.1540 ITU-T Recommendation Y.1540 (2002), Internet protocol data communication service IP packet transfer and availability performance parameters. ITU-T Y.1
43、541 ITU-T Recommendation Y.1541 (2006), Network performance objectives for IP-based services. ITU-T Hdbk QoS ITU-T Handbook (2004), Quality of Service and Network Performance. ISO 9000 ISO 9000:2005, Quality management systems Fundamentals and vocabulary. ISO/IEC Guide 62 ISO/IEC Guide 62:1996, Gene
44、ral requirements for bodies operating assessment and certification/registration of quality systems. ISO/IEC Guide 65 ISO/IEC Guide 65:1996, General requirements for bodies operating product certification systems. ETSI ETR 003 ETSI ETR 003 ed.2 (1994), Network Aspects (NA); General aspects of Quality
45、 of Service (QoS) and Network Performance (NP). ITU-T Rec. E.802 (02/2007) 3 ETSI EG 202 057-1 ETSI EG 202 057-1 V1.2.1 (2005), Speech Processing, Transmission and Quality Aspects (STQ); User-related QoS parameter definitions and measurements; Part 1: General. ETSI EG 202 057-2 ETSI EG 202 057-2 V1.
46、2.1 (2005), Speech Processing, Transmission and Quality Aspects (STQ); User-related QoS parameter definitions and measurements; Part 2: Voice telephony, Group 3 fax, modem data services and SMS. ETSI EG 202 057-3 ETSI EG 202 057-3 V1.1.1 (2005), Speech Processing, Transmission and Quality Aspects (S
47、TQ); User-related QoS parameter definitions and measurements; Part 3: QoS parameters specific to Public Land Mobile Networks (PLMN). ETSI EG 202 057-4 ETSI EG 202 057-4 V1.1.1 (2005), Speech Processing, Transmission and Quality Aspects (STQ); User-related QoS parameter definitions and measurements;
48、Part 4: Internet access. 3 Definitions This Recommendation defines the following terms: NOTE Several terms and definitions used in this Recommendation are defined in ITU-T E.800 and ITU-T G.1000. 3.1 accuracy: A performance criterion that describes the degree of correctness with which a function is
49、performed. (The function may or may not be performed with the desired speed.) 3.2 availability: Availability of an item to be in a state to perform a required function at a given instant of time or at any instant of time within a given time interval, assuming that the external resources, if required, are provided. 3.3 criterion: A single characteristic of a product or a service that is observable and/or measurable. 3.4 customer: The party that uses a telecommunica
