1、 ETSI TS 102 250-1 V2.2.1 (2011-04)Technical Specification Speech and multimedia Transmission Quality (STQ);QoS aspects for popular services in mobile networks;Part 1: Assessment of Quality of ServiceETSI ETSI TS 102 250-1 V2.2.1 (2011-04)2Reference RTS/STQ-00107m Keywords 3G, GSM, network, QoS, ser
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6、ritten permission. The copyright and the foregoing restriction extend to reproduction in all media. European Telecommunications Standards Institute 2011. All rights reserved. DECTTM, PLUGTESTSTM, UMTSTM, TIPHONTM, the TIPHON logo and the ETSI logo are Trade Marks of ETSI registered for the benefit o
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8、red and owned by the GSM Association. ETSI ETSI TS 102 250-1 V2.2.1 (2011-04)3Contents Intellectual Property Rights 5g3Foreword . 5g3Introduction 6g31 Scope 8g32 References 8g32.1 Normative references . 8g32.2 Informative references 8g33 Abbreviations . 9g34 Guidance on commonly used Terms and Defin
9、itions 9g35 QoS Background 12g35.1 End-to-End QoS . 13g35.2 Relationship of QoS and Performance . 14g35.3 Relationship of QoS and QoE 14g35.4 QoS Models in Standardisation Documents . 16g35.4.1 Model of ITU-T Recommendation G.1000 16g35.4.1.1 QoS Required by the User (QoSR) . 17g35.4.1.2 QoS Offered
10、 by the Service Provider (QoSO) 17g35.4.1.3 QoS Delivered by the Service Provider (QoSD) . 17g35.4.1.4 QoS Experienced by the User (QoSE) 18g35.4.2 Model of ITU-T Recommendation E.800 . 18g35.4.3 Phase oriented Aspect Model 19g36 QoS Assessment Process 20g36.1 Objective of a QoS Assessment . 20g36.2
11、 Boundary conditions for a QoS Assessment 21g36.2.1 Setting the Target of the Assessment 21g36.2.2 Defining the Boundary Conditions . 21g36.2.3 Operational Issues . 21g36.3 Execution of a QoS Assessment . 22g36.4 Validating and Aggregating Results of a QoS Assessment 22g36.5 Reporting Results of a Q
12、oS Assessment 22g36.6 Matching QoS Results with Targets . 23g36.7 Optimization of QoS Matters . 23g37 Basic Settings for QoS Assessments 23g37.1 Location where the Measurement is actually performed 23g37.1.1 Concept of PCOs 23g37.1.2 Point of Recording (POR) . 24g37.2 Usage of Standardized Units for
13、 Data 24g37.3 Influence of Timeout Values on Failure Ratios 24g38 Service Independent QoS Criteria 25g38.1 Unavailability . 25g38.2 Non-Accessibility . 25g38.3 Time Parameters . 25g38.4 Transfer Time . 25g38.5 Content Integrity 25g39 Service dependent QoS Criteria . 26g39.1 Rate Parameters 26g39.2 R
14、atio Parameters 26g39.3 Service Non-Accessibility 26g39.4 Setup Time . 26g39.5 Failure Ratio . 26g3ETSI ETSI TS 102 250-1 V2.2.1 (2011-04)49.6 Cut-off Ratio 26g39.7 End-to-end Failure Ratio 27g39.8 End-to-end Delivery Time 27g3Annex A (informative): Bibliography . 28g3History 29g3ETSI ETSI TS 102 25
15、0-1 V2.2.1 (2011-04)5Intellectual 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-members, and can be found in ETSI SR 000 314: “
16、Intellectual Property Rights (IPRs); Essential, or potentially Essential, 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 i
17、nvestigation, 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 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 Sp
18、ecification (TS) has been produced by ETSI Technical Committee Speech and multimedia Transmission Quality (STQ). The present document is part 1 of a multi-part deliverable covering the QoS aspects for popular services in mobile networks, as identified below: Part 1: “Assessment of Quality of Service
19、“; Part 2: “Definition of Quality of Service parameters and their computation“; Part 3: “Typical procedures for Quality of Service measurement equipment“; Part 4: “Requirements for Quality of Service measurement equipment“; Part 5: “Definition of typical measurement profiles“; Part 6: “Post processi
20、ng and statistical methods“; Part 7: “Network based Quality of Service measurements“. The present document builds an umbrella document for this multi-part deliverable. It summarizes the basics of Quality of Service, always seen from the users perspective. Differences to Quality of Experience (QoE) a
21、re also discussed. In extension to generic definitions, specific definitions for this multi-part deliverable are stated here. Furthermore, it gives guidance to assure that QoS assessments can be conducted in a meaningful way and proposes an according process. Part 2 defines QoS parameters and their
22、computation for popular services in mobile networks. The parameter definition is split into several parts. It contains an abstract definition which gives a generic description of the parameter, an abstract equation and the corresponding user and technical trigger points. The harmonized definitions g
23、iven in part 2 are considered as prerequisites for the comparison of QoS measurements and measurement results. Part 3 describes the measurement procedures needed to perform the measurements of QoS parameters in line with the definitions given in part 2, applying the test profiles defined in part 5.
24、Part 4 defines the minimum requirements of QoS measurement equipment for mobile networks in the way that the values and trigger points needed to compute the QoS parameter as defined in part 2 can be measured following the procedures defined in part 3. Test equipment fulfilling the specified minimum
25、requirements will allow performing the proposed measurements in a reliable and reproducible way. Part 5 specifies typical measurement profiles which are required to enable benchmarking of different mobile networks both within and outside national boundaries. Part 6 describes procedures to be used fo
26、r statistical calculations in the field of QoS measurement of mobile networks using probing systems. Part 7 describes how Quality of Service measurements should be done inside the network without direct access to the end point terminal. ETSI ETSI TS 102 250-1 V2.2.1 (2011-04)6Introduction The term Q
27、uality of Service (QoS) is extensively used today, not just in the telecommunication world in which it has its roots, but increasingly regarding broadband, wireless and multimedia services that are based on the IP protocol. Networks and systems are gradually being designed in consideration of the en
28、d-to-end performance required by user applications; however, the term QoS is usually not well-defined, is used loosely or, worst of all, misused. Therefore, guidance is needed on how to understand and apply the term QoS. The term “Quality of Service“ addresses technical as well as non-technical aspe
29、cts affecting a service. Different concepts and guidance have been developed to cover various interests and viewpoints of all parties of telecommunications service market, i.e. users, service providers, network operators, manufacturers and regulators. In many cases, the user and his or her expectati
30、ons with respect to quality are in the centre of interest. This very generic topic can have manifold characteristics: Depending on the role of the user, his expectations may vary: Considering service quality he might have other expectations compared with situations that are oriented more commerciall
31、y, e.g. when he is in contractual discussions with his service provider. Not only service usage is relevant to the user. The overall impression of all touch points with his provider is influencing his personal quality reception. Furthermore, the user compares his expectations with the reached level
32、of fulfilment. Future decisions will be based on his personal perception of the achieved level of quality. In this case, subjective components get an increased weight and importance. Taking these aspects also into account, the term “Quality of Service“ has to be extended to “Quality of Experience“ w
33、ith a more subjective meaning. This multi-part deliverable covers all facets which are relevant to the assessment of Quality of Service as seen from a users perspective but with a technical interpretation. Whereas the “users perspective“ reflects events and triggers observable by a user, the “techni
34、cal interpretation“ is related to the fact that quality statements should be reproducible, comparable and reliable. Often automation techniques are used to achieve these goals based on a statistically valid data basis. From a more practical view, different assessment methods are discussed. In a furt
35、her step, the preparation and execution of assessment procedures are shown as well as the generation of key performance indicators, their aggregation and their matching against pre-defined target values. Finally, consecutive steps like optimization procedures are concluding this process-like view of
36、 QoS. Also belonging to the more practical clause of the present document, basic definitions of measures are provided. To generate a common understanding of service independent and service dependent measures is also a goal which the last clauses of the present document should achieve. In detail, the
37、 present document describes Quality of Service from a more theoretical and a more practical view. Clauses 4 and 5 build the theoretical background of all Quality of Service related matters: Clause 4 reflects all relevant definitions and abbreviations which are used in terms of Quality of Service. Th
38、ey are compiled from different sources like reference documents, involved services and standardization discussions. Clause 5 contains background information to Quality of Service. This rather theoretical clause discusses generic definitions of Quality of Service, Performance and Quality of Experienc
39、e. Furthermore, QoS models defined in further standard documents and their interrelations are a subject of discussion. Clauses 6 to 9 lead step by step from theoretical discussions on QoS to issues which are of practical and pragmatically relevance: Clause 6 presents a sequential order which describ
40、es a QoS assessment as being a process. Starting with the definition of targets and required preparation steps, the execution of the assessment as well as validation, reporting and optimization matters are discussed. Clause 7 provides basic definitions which are required to have a common understandi
41、ng on fundamental topics. Examples are question like “What is a kilobyte?“ or “How to define a timeout value?“. ETSI ETSI TS 102 250-1 V2.2.1 (2011-04)7 Clause 8 deals with service independent QoS criteria, namely QoS parameters which are of relevance before a service is used. This covers e.g. the c
42、onnection dialup via mobile networks. Clause 9 handles service dependent QoS criteria. Depending on the service, different parameters are required or not to give a complete picture of this services QoS. The standardization work in the QoS area is still ongoing. Therefore, the definitions and procedu
43、res given in will have to be reviewed on a regular basis to keep them up to date. The information contained in the present document will form among other input the basis for further work, but is likely to be modified and amended. Therefore, it is recommended to cross-check the given information with
44、 actual discussions within ITU-T and ETSI and with standards published after the date of publication of the present document. ETSI ETSI TS 102 250-1 V2.2.1 (2011-04)81 Scope The present document serves as a generic umbrella document for the further documents part 2 to part 7 of this series. It gives
45、 an overview over the topics addressed by these documents and enables the reader to work with the documents in the intended way. It is important to understand that the complete series of documents focuses on Quality of Service which stands for the objective discussion of quality measures from a rath
46、er technical perspective. Based on existing quality standards and further definitions, a complete picture of Quality of Service as seen from a users point of view is drawn. Wherever possible, existing ITU-T or ETSI definitions are referenced. If ITU-T or ETSI definitions do not exist or are consider
47、ed as too generic, a more service and mobile network specific definition is made. The present document comprises the theoretical backgrounds to understand terms like “Quality of Service“, “Network Performance“ and “Quality of Experience“. Their meaning and interrelation are discussed by taking diffe
48、rent QoS models into account. 2 References References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the reference document (i
49、ncluding any amendments) applies. Referenced documents which are not found to be publicly available in the expected location might be found at http:/docbox.etsi.org/Reference. NOTE: While any hyperlinks included in this clause were valid at the time of publication ETSI cannot guarantee their long term validity. 2.1 Normative references The following referenced documents are necessary for the application of the present document. 1 ITU-T Recommendation E.800: “Definitions of terms related to quality of service“. 2 ITU-T Recommendation G.1000: “Communic
