1、 I n t e r n a t i o n a l T e l e c o m m u n i c a t i o n U n i o n ITU-T E.802 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Amendment 1 (03/2017) SERIES E: OVERALL NETWORK OPERATION, TELEPHONE SERVICE, SERVICE OPERATION AND HUMAN FACTORS Quality of telecommunication services: concepts, models
2、, objectives and dependability planning Terms and definitions related to the quality of telecommunication services Framework and methodologies for the determination and application of QoS parameters Amendment 1 Recommendation ITU-T E.802 (2007) Amendment 1 ITU-T E-SERIES RECOMMENDATIONS OVERALL NETW
3、ORK OPERATION, TELEPHONE SERVICE, SERVICE OPERATION AND HUMAN FACTORS INTERNATIONAL 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
4、international telephone service E.160E.169 International routing plan E.170E.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 CHARG
5、ING AND ACCOUNTING IN THE INTERNATIONAL TELEPHONE SERVICE Charging in the international 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 Phototel
6、egraphy E.320E.329 ISDN PROVISIONS CONCERNING USERS E.330E.349 INTERNATIONAL 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 M
7、easurement and recording of traffic E.490E.505 Forecasting of traffic E.506E.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 Traf
8、fic engineering for IP-networks E.650E.699 ISDN traffic engineering E.700E.749 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.800
9、E.809 Models for telecommunication services E.810E.844 Objectives for quality 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
10、 equipment, networks and services E.880E.899 OTHER E.900E.999 For further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T E.802 (2007)/Amd.1 (03/2017) i Recommendation ITU-T E.802 Framework and methodologies for the determination and application of QoS parameters Amendment 1 S
11、ummary Recommendation ITU-T E.802 provides a framework and methodologies for the identification of QoS 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 obtai
12、n users QoS requirements and to prioritize the criteria or parameters. All these may be applied to services supported by the terrestrial and wireless legacy networks as well as services supported by the emerging IP network. Amendment 1 incorporates Annex A, which provides guidance on the selection o
13、f representative samples in the measurement of QoS parameters. At the time of publication Recommendation ITU-T E.802 had opted not to give this guidance because “the selection of representative samples is a process that is heavily influenced by specific technical and operational conditions of the me
14、asurement task.“ (see clause 8.5). Annex A therefore provides guidance that takes into account these technical (statistical) and operational (practical QoS data collection) conditions by proposing a simple random sampling methodology. This amendment also adds Appendices IV and V with additional info
15、rmation on the implementation of the sampling algorithm included in Annex A, and on the use of sample-based QoS parameters. Amendment 1 includes an electronic attachment with the files needed for the implementation of a sample calculator that demonstrates the sampling methodology given in clause A.2
16、. History Edition Recommendation Approval Study Group Unique ID* 1.0 ITU-T E.802 2007-02-08 2 11.1002/1000/8848 1.1 ITU-T E.802 (2007) Amd. 1 2017-03-01 12 11.1002/1000/13167 _ * To access the Recommendation, type the URL http:/handle.itu.int/ in the address field of your web browser, followed by th
17、e Recommendations unique ID. For example, http:/handle.itu.int/11.1002/1000/11830-en. ii Rec. ITU-T E.802 (2007)/Amd.1 (03/2017) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications. The ITU Telecommunication Standardiza
18、tion Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Assembly (WTSA), which me
19、ets every four years, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on these topics. 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
20、 purview, the necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. Compliance with this Recommendation is
21、 voluntary. However, the Recommendation may contain certain mandatory provisions (to ensure e.g. interoperability or applicability) and 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“ an
22、d the negative equivalents are used to express requirements. The use of such words does not suggest that compliance with the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTSITU draws attention to the possibility that the practice or implementation of this Recommendation may invo
23、lve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Reco
24、mmendation, ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementers are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database a
25、t http:/www.itu.int/ITU-T/ipr/. ITU 2017 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T E.802 (2007)/Amd.1 (03/2017) iii Table of Contents Page 1 Scope . 1 2 References . 2 3 Definitions 3 4 Abbrevi
26、ations and acronyms 5 5 Conventions 5 6 Methodology for identification of QoS criteria and parameters . 6 6.1 General considerations . 6 6.2 Identification of users QoS criteria 8 6.3 Conversion of QoS criteria to QoS parameters 12 6.4 Publication of QoS parameters . 14 6.5 Practical issues when usi
27、ng QoS parameters 14 7 Measurement of QoS parameters 15 7.1 Objective measurements . 15 7.2 Subjective measurements . 16 7.3 Who should perform the measurements . 16 8 Guidelines for defining quality objectives 17 8.1 General considerations . 17 8.2 Defining initial quality objectives 18 8.3 Definin
28、g target values . 18 8.4 Tuning quality objectives . 19 8.5 Verification of QoS objectives . 20 Annex A Guidelines on selection of representative samples 22 A.1 Scope 22 A.2 Methodology for selection of representative samples 22 Appendix I References for the development of QoS metrics and examples o
29、f QoS parameters . 26 I.1 Examples of QoS parameters . 26 Appendix II Quality objectives . 28 II.1 Voice telephony and voiceband services 28 II.2 Services over packet-based networks . 29 Appendix III Examples for the usage of the three models 31 III.1 Universal model 31 III.2 Performance model . 32
30、III.3 Four-market model . 33 Appendix IV Sample calculator 34 IV.1 Sample calculator R implementation . 34 iv Rec. ITU-T E.802 (2007)/Amd.1 (03/2017) Page IV.2 Sampling algorithm R implementation . 37 Appendix V Minimum required number of measurements for statistically significant QoS parameter eval
31、uations . 53 V.1 Comparison of QoS parameters for benchmarking and quality trends 53 Bibliography. 55 Electronic attachment with the files needed for the implementation of a sample calculator that demonstrates the sampling methodology given in clause A.2. Rec. ITU-T E.802 (2007)/Amd.1 (03/2017) 1 Re
32、commendation ITU-T E.802 Framework and methodologies for the determination and application of QoS parameters Amendment 1 Editorial note: This is a complete-text publication. Modifications introduced by this amendment are shown in clean text for readability purposes. 1 Scope This Recommendation1 prov
33、ides a framework and methodologies for the identification of QoS 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 priori
34、tize the criteria or parameters. All these may be applied to services 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 c
35、oncern to the service/network providers (e.g., network performance 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/n
36、etwork providers perspective, refer to ITU-T E.419 on key performance 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
37、QoS, the delivered QoS and the perceived QoS as described in ITU-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
38、a combination of these models may be used for a particular service 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
39、measurable QoS parameters and on the adoption and measurement of 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. Com
40、paring the level of quality and quality commitments of services of different service providers. Preparing long-term studies on the level of quality attributes of a specific service. _ 1 Amendment 1 to this Recommendation included an electronic attachment with the files needed for the implementation
41、of a sample calculator that demonstrates the sampling methodology given in clause A.2. 2 Rec. ITU-T E.802 (2007)/Amd.1 (03/2017) Preparing statistics, reports and publications of the quality of a service. Regulatory purposes including specification of the minimum level of quality (e.g., for universa
42、l service, interconnection 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 curre
43、ntly available in standardization. Appendix III gives examples for the use of the three models for the identification of QoS criteria. 2 References The following ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provisions of this Recomme
44、ndation. 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 and other referenc
45、es 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 oriented key perfor
46、mance 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 quality of servi
47、ce 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 G.1020 (2006), P
48、erformance 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), Network contributio
49、n 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 networks, 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.
