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TECHNICAL SPECIFICATION
Speech and multimedia Transmission Quality (STQ);
QoS aspects for popular services in mobile networks;
Part 8: Formalized definition of Quality of Service parameters
and their computation;
Sub-part 1: General aspects and terminology
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2 ETSI TS 102 250-8-1 V1.1.1 (2018-12)
Reference
DTS/STQ-00218m
Keywords
3G, GSM, network, QoS, service, speech
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3 ETSI TS 102 250-8-1 V1.1.1 (2018-12)
Contents
Intellectual Property Rights . 6
Foreword . 6
Modal verbs terminology . 6
Introduction . 6
1 Scope . 8
2 References . 8
2.1 Normative references . 8
2.2 Informative references . 10
3 Definitions of terms, symbols and abbreviations . 10
3.1 Terms . 10
3.2 Symbols . 10
3.3 Abbreviations . 11
4 QoS parameter basics . 12
4.1 Measurable quantities and sample averages . 12
4.2 Points of observation . 13
4.3 Events . 14
4.3.1 Introduction. 14
4.3.2 Abstract events . 14
4.3.3 Technical events . 15
4.3.4 Representations of an event at different points of observation . 15
4.3.5 Two-stage specification of QoS parameters defined in terms of events . 16
4.4 Transactions and their trigger events . 16
5 Symbols and formulas for common types of QoS parameters . 17
5.1 Introduction . 17
5.2 Basic measurable quantities associated with events . 17
5.2.1 Event indicators . 17
5.2.2 Event times . 17
5.3 Generic aggregation formulas for sample averages . 17
5.3.1 Introduction. 17
5.3.2 Event count . 18
5.3.3 Sample average . 18
5.3.4 Conditional sample average . 18
5.4 Ratios . 18
5.4.1 Sample ratio of an event . 18
5.4.2 Conditional ratio of an event. 19
5.4.3 Success ratio of a transaction . 19
5.4.4 Failure ratio of a transaction . 19
5.5 Durations . 20
5.5.1 Duration of a transaction . 20
5.5.2 Mean duration of a transaction . 20
5.6 Data amount and data rates. 20
5.6.1 Data amount transferred in a transaction . 20
5.6.2 Data rate of a transaction . 21
5.6.3 Mean data rate of a transaction . 21
6 Phases of service usage and associated QoS parameters . 21
6.1 Segmentation into phases . 21
6.2 Success of a phase . 22
6.3 Duration of a phase. 22
6.4 Other QoS parameters related to a phase . 23
7 Points of observation . 23
7.1 Overview . 23
7.1.1 GERAN/UTRAN/E-UTRAN network access model . 23
ETSI
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4 ETSI TS 102 250-8-1 V1.1.1 (2018-12)
7.1.2 2G CS domain . 24
7.1.3 2G PS control plane . 25
7.1.4 2G PS user plane . 25
7.1.5 3G CS domain and PS control plane . 26
7.1.6 3G PS user plane . 27
7.1.7 4G PS control plane . 28
7.1.8 4G PS user plane . 29
7.2 Reference points and associated points of observation . 29
7.2.1 GSM/UMTS/LTE reference point R. 29
7.2.1.1 Specification of the reference point. 29
7.2.1.3 DL@R . 30
7.2.1.4 IMAP4@R . 30
7.2.1.5 POP3@R . 30
7.2.1.6 SMTP@R . 30
7.2.1.7 MLME@R . 30
7.2.1.8 MIC@R . 30
7.2.1.9 SPEAKER@R. 31
7.2.1.10 CAMERA@R . 31
7.2.1.11 VIDEO@R . 31
7.2.1.12 DNS@R . 31
7.2.1.13 FTP@R . 31
7.2.1.14 SIP@R . 31
7.2.1.15 RTP@R . 32
7.2.1.16 RTCP@R . 32
7.2.1.17 RTSP@R . 32
7.2.1.18 HTTP@R . 32
7.2.1.19 DHCP@R . 32
7.2.2 TETRA reference point RT . 33
7.2.2.1 Specification of the reference point. 33
7.2.2.2 AT@RT . 33
7.2.2.3 AUDIO@RT . 33
7.2.3 GSM interface Um . 33
7.2.3.1 Specification of the interface. 33
7.2.3.2 L3NAS@GSM_Um . 33
7.2.3.3 L3AS@GSM_Um . 33
7.2.3.4 RR_PH@GSM_Um . 33
7.2.4 TETRA interface Um. 33
7.2.4.1 Specification of the interface. 33
7.2.4.2 SNDCP@TETRA_Um . 34
7.2.4.3 CMCE@TETRA_Um . 34
7.2.4.4 LLC@T ET RA_U m . 34
7.2.5 UMTS interface Uu . 34
7.2.5.1 Specification of the interface. 34
7.2.5.2 L3NAS@UMTS_Uu . 34
7.2.5.3 L3AS@UMTS_Uu . 34
7.2.6 LTE interface Uu . 34
7.2.6.1 Specification of the interface. 34
7.2.6.2 L3NAS@LTE_Uu . 34
7.2.6.3 L3AS@LTE_Uu . 35
7.2.7 ISDN user network interface (UNI) . 35
7.2.7.1 Specification of the interface. 35
7.2.7.2 DSS1@UNI. 35
Annex A (informative): Example for applying the formulas of clause 5 . 36
A.1 A fictitious service and its QoS parameters . 36
A.2 Elementary measurement data . 36
A.3 Calculated quantities per measurement cycle. 37
A.4 Aggregations/Sample averages . 37
ETSI
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5 ETSI TS 102 250-8-1 V1.1.1 (2018-12)
Annex B (informative): Guidelines and templates for specification . 38
B.1 Document structure . 38
B.2 Top-down approach for deriving QoS parameter definitions . 38
B.3 Specification of points of observation . 39
B.3.1 Guidelines. 39
B.3.2 Specification template . 39
B.4 Specification of events . 40
B.4.1 Guidelines. 40
B.4.2 Specification template . 40
B.5 Specification of phases . 40
B.5.1 Guidelines. 40
B.5.2 Specification template . 41
B.6 Specification of QoS parameters . 41
B.6.1 Guidelines. 41
B.6.2 Specification template . 42
History . 43
ETSI
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6 ETSI TS 102 250-8-1 V1.1.1 (2018-12)
Intellectual 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 000 314: "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 investigation, 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 may 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 present document does
not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks.
Foreword
This Technical Specification (TS) has been produced by ETSI Technical Committee Speech and multimedia
Transmission Quality (STQ).
The present document is part 8, sub-part 1 of a multi-part deliverable. Full details of the entire series can be found in
part 1 [36].
Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
"cannot" are to be interpreted as described in clause 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.
Introduction
The definition of quality of service (QoS) parameters and their computation, as in ETSI TS 102 250-2 [i.1], involves a
couple of formal aspects which require special attention but have not been addressed systematically so far by the ETSI
TS 102 250 document series. These aspects include:
• Introduction and consistent usage of appropriate symbols in mathematical equations according to the ETSI
Drafting Rules.
• Clear distinction between measurable quantities and associated statistical aggregations.
• Unambiguous naming of trigger events which occur in the definitions of several different QoS parameters.
• Systematic introduction and definition of appropriate points of observation which form the link between
harmonized, abstract QoS parameter definitions and their application to specific contexts, e.g. particular types
of access networks.
ETSI
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7 ETSI TS 102 250-8-1 V1.1.1 (2018-12)
Over the years, application and maintenance of ETSI TS 102 250-2 [i.1] has revealed some deficiencies in this respect,
which are not easily solvable via ordinary change requests, but would require structural changes of ETSI
TS 102 250-2 [i.1]. Therefore, a new part 8 of the ETSI TS 102 250 series is introduced, of which the present document
represents the first sub-part.
The present document treats the aspects listed above in a systematic way and specifies general requirements for a
formalized definition of QoS parameters. Subsequent sub-parts of ETSI TS 102 250-8 are envisaged to contain QoS
parameter definitions in accordance with the present document. These definitions will then replace, and thus obsolete,
corresponding parts of ETSI TS 102 250-2 [i.1].
Clause 4 introduces the basic terminology used in a formalized treatment of QoS parameters: After clarifying the
difference between measurable quantities and statistical averages, the concept of points of observation is explained in
detail. Afterwards, the notion of abstract and technical events is introduced and used to specify a methodology for
deriving harmonized QoS parameters in two stages. Finally, a formalized, event-based characterization of the term
"transaction" is given, which proves to be useful when modelling complex scenarios of service usage.
Clause 5 specifies generic symbols and formulas for types of quantities frequently occurring in QoS parameter
definitions, like event indicators, time durations or data rates. In addition, formally correct definitions for commonly
used sample averages are given.
A systematic approach for deriving QoS parameters for non-trivial services, which may be subdivided into different
"phases", is outlined in clause 6.
Finally, clause 7 defines user-oriented points of observation for different types of access networks. The exact locations
of these points are illustrated in protocol stack overview figures, and reference is made to the corresponding protocol
specifications.
Two informative annexes complement the main text of the present document:
• Annex A gives some guidance how to apply the rather formal definitions of clause 5 in practice by outlining a
contrived, but complete, example.
• Annex B contains guidelines for writing specifications according to the present document. These guidelines
include suggestions for structuring the respective document (for example, one of the intended further sub-parts
of ETSI TS 102 250-8 [i.3]) as well as templates for particular parts of such specifications.
ETSI
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8 ETSI TS 102 250-8-1 V1.1.1 (2018-12)
1 Scope
The present document defines a consistent terminology for the formalized definition of quality of service (QoS)
parameters and their computation. In doing so, it carefully distinguishes between measurable quantities and associated
statistical aggregation formulas. For frequently used types of quantities and aggregations, generic symbols and
calculation formulas are specified.
For a large class of QoS parameters, which are basically determined by the observation of events, the present document
specifies a methodology for constructing definitions in two stages, using the concept of abstract events and their
representation by technical events at well-defined points of observation.
In addition, a framework is presented which indicates how QoS parameters may be derived in a generic way via sub-
dividing the usage of a service into meaningful sub-transactions, called "phases".
2 References
2.1 Normative 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
referenced document (including any amendments) applies.
Referenced documents which are not found to be publicly available in the expected location might be found at
https://docbox.etsi.org/Reference.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cann
...