1、 ETSI TR 103 468 V1.1.1 (2018-07) Speech and multimedia Transmission Quality (STQ); Quality of Service aspects for 5G; Discussion of QoS aspects of services related to the 5G ecosystem TECHNICAL REPORT ETSI ETSI TR 103 468 V1.1.1 (2018-07) 2Reference DTR/STQ-00214m Keywords data, network, QoS, servi
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7、horization of ETSI. The copyright and the foregoing restriction extend to reproduction in all media. ETSI 2018. All rights reserved. DECTTM, PLUGTESTSTM, UMTSTMand the ETSI logo are trademarks of ETSI registered for the benefit of its Members. 3GPPTM and LTETMare trademarks of ETSI registered for th
8、e benefit of its Members and of the 3GPP Organizational Partners. oneM2M logo is protected for the benefit of its Members. GSMand the GSM logo are trademarks registered and owned by the GSM Association. ETSI ETSI TR 103 468 V1.1.1 (2018-07) 3Contents Intellectual Property Rights 4g3Foreword . 4g3Mod
9、al verbs terminology 4g3Executive summary 4g3Introduction 5g31 Scope 6g32 References 6g32.1 Normative references . 6g32.2 Informative references 6g33 Abbreviations . 6g34 QoS relevant innovation in 5G . 7g34.1 Overview 7g34.2 Central features 7g34.3 Methodology in general 7g34.4 Quick Summary 8g35 D
10、iscussion of 5G features in 3GPP TS 22.261 clause 6 w/r to relevance for QoS and QoE . 8g35.1 Network slicing 8g35.2 Diverse mobility management 8g35.3 Multiple access technologies 8g35.4 Resource efficiency 8g35.5 Efficient user plane . 9g35.6 Efficient content delivery . 9g35.7 Priority, QoS, and
11、policy control 9g35.8 Dynamic policy control 9g35.9 Connectivity models . 9g35.10 Network capability exposure 9g35.11 Context aware network . 9g35.12 Self backhaul 9g35.13 Flexible broadcast/multicast . 9g35.14 Subscription aspects . 10g35.15 Energy efficiency . 10g35.16 Markets requiring minimal se
12、rvice levels 10g35.17 Extreme long range coverage in low density areas 10g35.18 Multi-network connectivity 10g35.19 3GPP access network selection 10g35.20 eV2X aspects 10g35.21 NG-RAN sharing 11g35.22 Unified access control 11g36 Over the top services 11g3History 12g3ETSI ETSI TR 103 468 V1.1.1 (201
13、8-07) 4Intellectual Property Rights Essential patents IPRs essential or potentially essential to normative deliverables 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
14、314: “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 (https:/ipr.etsi.org/). Pursuant to the ETSI IPR Policy, no investiga
15、tion, 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. Trademarks The present document ma
16、y include trademarks and/or tradenames which are asserted and/or registered by their owners. ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no right to use or reproduce any trademark and/or tradename. Mention of those trademarks in the
17、 present document does not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks. Foreword This Technical Report (TR) has been produced by ETSI Technical Committee Speech and multimedia Transmission Quality (STQ). While - at the time of publication
18、 - there is no final, complete specification of 5G, its essential properties are well defined. The present document addresses the question if, and potentially how, these properties require an extension of the current portfolio of QoS metrics which describe the technology from a strictly end user, se
19、rvice-oriented point of view. For this purpose, a systematic analysis of 5G features and their relation to QoS is presented. Modal verbs terminology In the present document “should“, “should not“, “may“, “need not“, “will“, “will not“, “can“ and “cannot“ are to be interpreted as described in clause
20、3.2 of the ETSI Drafting Rules (Verbal forms for the expression of provisions). “must“ and “must not“ are NOT allowed in ETSI deliverables except when used in direct citation. Executive summary The present document addresses the question if the inventory of QoS parameters needs to be expanded to ade
21、quately cover the upcoming 5G standard. Thorough examination leads to the conclusion that, as 5G does not provide any new type of service, no such extension is intrinsically required. Likewise, the inventory of methodologies used for performance testing is adequate. However, due to new properties of
22、 5G such as network slicing and dynamic prioritization of services, the role of careful design of test scenarios will be more prominent. In particular, the understanding of a packet data network as a static medium (“bit pipe“) becomes even less applicable than in existing technologies. As a conseque
23、nce, predictions derived from testing with a particular use case, which is in general a particular set of parameters for a generic test case, become less reliable. Also, the range of comparability between QoS parameters which have been derived with different parameter sets may become smaller, increa
24、sing the need for careful design of test conditions, thorough understanding of methodologies, and comprehensive documentation of tests. ETSI ETSI TR 103 468 V1.1.1 (2018-07) 5Introduction 5G is the upcoming new generation of mobile network technology. It is characterized by an increase in general pe
25、rformance on the transport plane, i.e. data rates and latency, but also by a range of new features such as network slicing and dynamic prioritization of data transport. The present document addresses the question if the current inventory of QoS parameters is adequate to cover and serve the 5G ecosys
26、tem, or if new services have to be considered or QoS parameters of existing services have to be adapted. ETSI ETSI TR 103 468 V1.1.1 (2018-07) 61 Scope The present document summarizes the results of an analysis of the impact of the upcoming 5G on existing QoS metrics, and the question if extensions
27、or modifications of the portfolio of QoS parameters portfolio are required to capture respective properties of 5G. The analysis starts with a summary of features and properties of 5G which can be expected to be relevant for QoS assessment. The first question addressed is if there are features of the
28、 5G roadmap - as far as technically stable as of the time of publication, or reasonably stable projections - which constitute new services which would then require new sets of QoS parameters. The second question is in what way projected 5G properties may require adaptations with respect to measureme
29、nt methodologies, computation, or usage of existing QoS parameters. 2 References 2.1 Normative references Normative references are not applicable in the present document. 2.2 Informative references References are either specific (identified by date of publication and/or edition number or version num
30、ber) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the referenced document (including any amendments) applies. NOTE: While any hyperlinks included in this clause were valid at the time of publication ETSI cannot guarantee
31、 their long term validity. The following referenced documents are not necessary for the application of the present document but they assist the user with regard to a particular subject area. i.1 3GPP TS 22.261 (V16.1.0) (2017-09): “3rdGeneration Partnership Project; Technical Specification Group Ser
32、vices and System Aspects; Service requirements for the 5G system; Stage 1 (Release 16)“. 3 Abbreviations For the purposes of the present document, the following abbreviations apply: AR Augmented Reality eV2X enhanced Vehicle-to-Anything FTP File Transfer Protocol NG-RAN New Generation Radio Access N
33、etwork OTT Over The Top QoE Quality of Experience QoS Quality of Service SMS Short Message Service UE User Equipment VR Virtual RealityETSI ETSI TR 103 468 V1.1.1 (2018-07) 74 QoS relevant innovation in 5G 4.1 Overview This clause provides a quick overview of the most important QoS related aspects o
34、f 5G. The following clause will then present a systematic, step-by-step analysis of 5G features (according to 3GPP TS 22.261 i.1) and their relevance for QoS and QoE. 4.2 Central features 5G features can, from a QoS and QoE point of view, be divided into two categories: Quantitative improvements suc
35、h as an increase in available data rate or reduction of latency. Qualitative expansions which by themselves constitute new types of service by themselves. Quantitative improvements can act, in a more or less direct way, as enablers for new types of services. They do, however, carry respective proper
36、ties. For instance, an ecosphere around multimedia services such as Video Streaming will only evolve if the medium provides a certain minimum bandwidth. Likewise, an ecosphere of smartphone based applications - and in particular the rich OTT world that can observed at times of the publication of the
37、 present document - is linked to availability of devices as well as of sufficiently mature wideband network coverage. The performance increases promised by 5G do not, however, provide compelling reasons to assume new types of service linked to 5G alone. Emerging new types of application such as Augm
38、ented Reality (AR) or Virtual Reality (VR) can be expected to require a new layer of QoS parameters dealing with physiological effects or an extension of subjective perception into new areas, but this is not seen as tightly linked to 5G. New services would ask for respective QoS parameters to descri
39、be their perception from an end-user perspective. For instance, SMS, first offered by 2G, was a new class of service which was not offered and which needed respective coverage by QoS metrics. There is, however, no such 5G specific service in sight. 4.3 Methodology in general As far as new types of r
40、adio access or end user device behaviour are concerned, conducting QoS relevant 5G-specific tests will require respective devices, much in the same way as it was the case for previous mobile network technology generations. Also, with an increase in overall performance, parameters of a typical servic
41、e usage will change. Again, this is not different from previous generations where e.g. the size and composition of web sites used for testing was adapted to reflect an overall increase in performance. 5G has, however, a feature which are in a less obvious way requiring careful consideration of exist
42、ing methodology. This is Network Slicing which in effect means that the network properties depend on the particular service usage, i.e. on the use case itself. It can be argued that this is not an entirely new property of mobile networks. Performance optimization strategies, such as Performance Enha
43、ncement Proxies, service-dependent data rates, or even Fair Use policies mean that a network is not a static bit pipe. In contrast to previous generations, 5G Network Slicing makes such behaviour an explicit, well-defined property of the medium. The consequence for testing can be described as a narr
44、owing of the prediction horizon of a particular test. If the performance of a packet network under test is essentially independent from the service it carries, i.e. from the protocol being used and the structure of data traffic, a measurement using test method A (e.g. FTP download) can be carried ou
45、t, and the results can be assumed to be valid, or at least indicative to a large degree, for services B (e.g. http download), C (e.g. e-mail) or even D (e.g. video streaming). With consequent application of the Network Slicing paradigm, it cannot be taken for granted that such inference still works.
46、 As a consequence, if information about network performance for a particular end to end service usage type is required, explicit tests with a respective scenario will be required - or at last explicit quantitative validation that a given “proxy service“ test can produce useful results. ETSI ETSI TR
47、103 468 V1.1.1 (2018-07) 84.4 Quick Summary In summary, 5G offers several enhanced features which can be expected to improve QoS and QoE from an end-user perspective. There are, however, no intrinsic new services which would require addition of new QoS parameters. Improvements will materialize in th
48、e form of better numerical values of respective indicators but along the dimensions already existing. There are changes to expect from a methodology point of view, though. Features such as Network Slicing and dynamic prioritization of services mean that essentially each service will encounter its ow
49、n, specific network. It is even possible that different parameter ranges for the same basic type of service - e.g. downloading large or small data volumes - will exhibit this effect. Moreover, there may be service types which need specific types of devices. This can be described as a reduction in the prediction range of a given test. It means that before applying results gained by a particular test scenario, careful consideration - and, ideally, some validation tests - are highly advisable. While this kind of context sensitivity is a property encountered in existing net
