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 Y.1545.1 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (03/2017) SERIES Y: GLOBAL INFORMATION INFRASTRUCTURE, INTERNET PROTOCOL ASPECTS, NEXT-GENERATION NETWORKS, INTERNET OF THINGS AND SMART CITIES Internet protocol aspe
2、cts Quality of service and network performance Framework for monitoring the quality of service of IP network services Recommendation ITU-T Y.1545.1 ITU-T Y-SERIES RECOMMENDATIONS GLOBAL INFORMATION INFRASTRUCTURE, INTERNET PROTOCOL ASPECTS, NEXT-GENERATION NETWORKS, INTERNET OF THINGS AND SMART CITI
3、ES GLOBAL INFORMATION INFRASTRUCTURE General Y.100Y.199 Services, applications and middleware Y.200Y.299 Network aspects Y.300Y.399 Interfaces and protocols Y.400Y.499 Numbering, addressing and naming Y.500Y.599 Operation, administration and maintenance Y.600Y.699 Security Y.700Y.799 Performances Y.
4、800Y.899 INTERNET PROTOCOL ASPECTS General Y.1000Y.1099 Services and applications Y.1100Y.1199 Architecture, access, network capabilities and resource management Y.1200Y.1299 Transport Y.1300Y.1399 Interworking Y.1400Y.1499 Quality of service and network performance Y.1500Y.1599 Signalling Y.1600Y.1
5、699 Operation, administration and maintenance Y.1700Y.1799 Charging Y.1800Y.1899 IPTV over NGN Y.1900Y.1999 NEXT GENERATION NETWORKS Frameworks and functional architecture models Y.2000Y.2099 Quality of Service and performance Y.2100Y.2199 Service aspects: Service capabilities and service architectu
6、re Y.2200Y.2249 Service aspects: Interoperability of services and networks in NGN Y.2250Y.2299 Enhancements to NGN Y.2300Y.2399 Network management Y.2400Y.2499 Network control architectures and protocols Y.2500Y.2599 Packet-based Networks Y.2600Y.2699 Security Y.2700Y.2799 Generalized mobility Y.280
7、0Y.2899 Carrier grade open environment Y.2900Y.2999 FUTURE NETWORKS Y.3000Y.3499 CLOUD COMPUTING Y.3500Y.3999 INTERNET OF THINGS AND SMART CITIES AND COMMUNITIES General Y.4000Y.4049 Definitions and terminologies Y.4050Y.4099 Requirements and use cases Y.4100Y.4249 Infrastructure, connectivity and n
8、etworks Y.4250Y.4399 Frameworks, architectures and protocols Y.4400Y.4549 Services, applications, computation and data processing Y.4550Y.4699 Management, control and performance Y.4700Y.4799 Identification and security Y.4800Y.4899 Evaluation and assessment Y.4900Y.4999 For further details, please
9、refer to the list of ITU-T Recommendations. Rec. ITU-T Y.1545.1 (03/2017) i Recommendation ITU-T Y.1545.1 Framework for monitoring the quality of service of IP network services Summary Recommendation ITU-T Y.1545.1 is a diagnostic reference for IP network quality of service (QoS) monitoring, and is
10、primarily a guide used to assist regulators in monitoring the QoS of Internet provided by service providers (although subscribers and network service providers may also benefit). The Internet, known as the information superhighway, has established a worldwide borderless cyber society. Nowadays, the
11、Internet is acknowledged worldwide as an essential component for electronic communication services. The rapid increase in the use of the Internet has changed the way people live, and has become an important factor in daily life. As reliance on Internet networks, in promoting socioeconomic developmen
12、t, increases the QoS of Internet networks also becomes very critical and important. However, occasionally the scenarios under which Internet is sold to customers is not fair and unfortunately Internet subscribers are not well informed on the Internet QoS provided to them by Internet service provider
13、s (ISPs). Therefore, this Recommendation highlights the necessity of testing the QoS of network services offered by ISPs, from a diagnostic and regulatory point of view. This Recommendation also addresses QoS evaluation scenarios, sampling methodology and testing tools for regulators. This Recommend
14、ation gives guidance to regulators about minimum QoS parameters for evaluating the quality of Internet services. History Edition Recommendation Approval Study Group Unique ID* 1.0 ITU-T Y.1545.1 2017-03-01 12 11.1002/1000/13199 Keywords Data rate, IP network service, QoS. * To access the Recommendat
15、ion, type the URL http:/handle.itu.int/ in the address field of your web browser, followed by the Recommendations unique ID. For example, http:/handle.itu.int/11.1002/1000/11830-en. ii Rec. ITU-T Y.1545.1 (03/2017) FOREWORD The International Telecommunication Union (ITU) is the United Nations specia
16、lized agency in the field of telecommunications, information and communication technologies (ICTs). 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 Recommendations on them wi
17、th 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. The approval of ITU-T Rec
18、ommendations 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 “Administration“ is used for
19、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 compliance with the Recom
20、mendation 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 Recommendation is required of any pa
21、rty. INTELLECTUAL PROPERTY RIGHTSITU 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 claimed Intellectual Property R
22、ights, 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 Recommendation. However, implemen
23、ters 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 2017 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written p
24、ermission of ITU. Rec. ITU-T Y.1545.1 (03/2017) iii Table of Contents Page 1 Scope . 1 2 References . 1 3 Definitions 2 3.1 Terms defined elsewhere 2 3.2 Terms defined in this Recommendation . 4 4 Abbreviations and acronyms 4 5 Conventions 5 6 Different aspects of quality of service 5 6.1 Four viewp
25、oints of QoS 5 6.2 QoS offered and QoS delivered 6 7 Minimum set of parameters for evaluating the quality of IP network service . 6 7.1 IP network service activation time . 6 7.2 DNS response time . 7 7.3 Number of IP network interconnection points . 7 7.4 Round-trip delay (RTT to IP network interco
26、nnection points) 7 7.5 IP delay variation (one-way delay variation to IP network interconnection points) . 7 7.6 IP packet loss (one-way packet loss to IP network interconnection points) 7 7.7 Data rate (download and upload) . 7 7.8 Internet IP network service availability 8 7.9 Radio coverage avail
27、ability 8 8 Quality of service measurement methodologies . 8 8.1 Testing tools . 9 8.2 Quality of service evaluation scenarios 10 9 Sampling methodology . 12 9.1 Selecting access lines for each speed package . 13 9.2 Selecting the measurement moments . 13 Appendix I Evaluation scenario at internatio
28、nal level 14 Bibliography. 15 Rec. ITU-T Y.1545.1 (03/2017) 1 Recommendation ITU-T Y.1545.1 Framework for monitoring the quality of service of IP network services 1 Scope This Recommendation highlights the need for testing the quality of service (QoS) of IP network service offered by Internet servic
29、e providers (ISPs), from a regulatory and diagnostic point of view. This Recommendation describes QoS evaluation scenarios and sampling methodology for both measuring and monitoring QoS. This Recommendation also gives guidance to regulators about the minimum set of QoS parameters necessary for evalu
30、ating the quality of IP network services. 2 References The following ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the time of publication, the editions indicated were valid. All Recommendations a
31、nd 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 references listed below. A list of the currently valid ITU-T Recommendations is regularly published.
32、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.802 Amd.1 Recommendation ITU-T E.802 (2007) Amd.1 (2017), Framework and methodologies for the determination and application of QoS parameters. ITU-T E.804 Recom
33、mendation ITU-T E.804 (2014), Quality of service aspects for popular services in mobile networks. ITU-T G.1000 Recommendation ITU-T G.1000 (2001), Communications Quality of Service: A framework and definitions. ITU-T Y.1540 Recommendation ITU-T Y.1540 (2016), Internet protocol data communication ser
34、vice IP packet transfer and availability performance parameters. ITU-T Y.1546 Recommendation ITU-T Y.1546 (2014), Hand-over performance among multiple access networks. ITU-T Y.1731 Recommendation ITU-T Y.1731 (2011), OAM functions and mechanisms for Ethernet based networks. IETF RFC 2681 IETF RFC 26
35、81 (1999), A Round-trip Delay Metric for IPPM. IETF RFC 7398 IETF RFC 7398 (2015), A Reference Path and Measurement Points for Large-Scale Measurement of Broadband Performance. IETF RFC 7799 IETF RFC 7799 (2016), Active and Passive Metrics and Methods (with Hybrid Types In-Between). ETSI EG 202 057
36、ETSI EG 202 057-04 V1.2.1 (2008), Speech Processing, Transmission and Quality Aspects (STQ); User related QoS parameter definitions and measurements; Part 4: Internet access. 2 Rec. ITU-T Y.1545.1 (03/2017) 3 Definitions 3.1 Terms defined elsewhere This Recommendation uses the following terms define
37、d elsewhere: 3.1.1 active methods of measurement IETF RFC 7799: Active methods of measurement have the following attributes: Active methods generate packet streams. Commonly, the packet stream of interest is generated as the basis of measurement. Sometimes, the adjective “synthetic“ is used to categ
38、orize active measurement streams ITU-T Y.1731. An accompanying packet stream or streams may be generated to increase overall traffic load, though the loading stream(s) may not be measured. The packets in the stream of interest have fields or field values (or are augmented or modified to include fiel
39、ds or field values) that are dedicated to measurement. Since measurement usually requires determining the corresponding packets at multiple measurement points, a sequence number is the most common information dedicated to measurement, and it is often combined with a timestamp. The source and destina
40、tion of the packet stream of interest are usually known a priori. The characteristics of the packet stream of interest are known at the source (at least), and may be communicated to the destination as part of the method. Note that some packet characteristics will normally change during packet forwar
41、ding. Other changes along the path are possible, see STDFORM. When adding traffic to the network for measurement, active methods influence the quantities measured to some degree, and those performing tests should take steps to quantify the effect(s) and/or minimize such effects. 3.1.2 dedicated comp
42、onent (links or nodes) IETF RFC 7398: All resources of a dedicated component (typically a link or node on the reference path) are allocated to serving the traffic of an individual subscriber. Resources include transmission time-slots, queue space, processing for encapsulation and address/port transl
43、ation, and others. A dedicated component can affect the performance of the reference path or the performance of any sub-path where the component is involved. 3.1.3 IP network service b-ITU-T Y.1241: An IP network service is defined as a data transmission service in which the data passed across the i
44、nterface between the user and provider is transferred in the form of Internet protocol (IP) packets (sometimes called datagrams). IP network service includes the service provided by using the IP transfer capabilities. 3.1.4 IP-based service b-ITU-T Y.1241: An IP-based service is defined as a service
45、 provided by the service plane to an end user (e.g., a host (end system) or a network element) and which utilizes the IP transfer capabilities and associated control and management functions, for delivery of the user information specified by the service level agreements. 3.1.5 managed and unmanaged
46、sub-paths IETF RFC 7398: Service providers are responsible for the portion of the path they manage. However, most paths involve a sub-path that is beyond the management of the subscribers service provider. This means that private networks, wireless networks using unlicensed frequencies, and the netw
47、orks of other service providers are designated as unmanaged sub-paths. The service demarcation point always divides managed and unmanaged sub-paths. 3.1.6 measurement point ITU-T Y.1540: The boundary between a host and an adjacent link at which performance reference events can be observed and measur
48、ed. Consistent with b-ITU-T I.353, the standard Internet protocols can be observed at IP measurement points (MPs). b-ITU-T I.353 provides more information about MPs, for digital services. 3.1.7 parameter b-ITU-T Y.1545: A quantifiable characteristic of a service with specified scope and boundaries.
49、3.1.8 passive methods of measurement IETF RFC 7799: Passive methods of measurement are based solely on observations of an undisturbed and unmodified packet stream of interest (in other words, the method of measurement MUST NOT add, change, or remove packets or fields or change field values anywhere along the path). Dependent on the existence of one or more packet streams to Rec. ITU-T Y.1545.1 (03/2017) 3 supply the stream of interest. Dependent on the presence of the packet stream o
