1、ETSI TS 102 024-9 V4.1.1 (2003-01) Technical Specificafion Telecommunications and Internet Protocol Harmonization Over Networks (TIPHON) Release 4; End-to-end Quality of Service in TIPHON Systems; Part 9: Call performance Classification (Voice) 2 ETSI TS 102 024-9 V4.1.1 (2003-01) Reference DTS/TIPH
2、ON-O5016R4 Keywords IP, performance, QoS, telephony, voice, VolP ETSI 650 Route des Lucioles F-O6921 Sophia Antipolis Cedex - FRANCE Tel.: +33 4 92 94 42 O0 Fax: +33 4 93 65 47 16 Siret No 348 623 562 00017 - NAF 742 C Association but non lucratif enregistre la Sous-prfecture de Grasse (06) No 7803/
3、88 Important notice Individual copies of the present document can be downloaded from: http:lwmv.etsi .arq The present document may be made available in more than one electronic version or in print. In any case of existing or perceived difference in contents between such versions, the reference versi
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6、 The copyright and the foregoing restriction extend to reproduction in all media. O European Telecommunications Standards Institute 2003. All rights reserved. DECTTM, PLUGTESTSTMand UMTSTMare Trade Marks of ETSI registered for the benefit of its Members. TIPHONTM and the TIPHON logo are Trade Marks
7、currently being registered by ETSI for the benefit of its Members. 3GPPTM is a Trade Mark of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. ETSI 3 ETSI TS 102 024-9 V4.1.1 (2003-01) Contents Intellectual Property Rights 4 Foreword . 4 1 Scope 5 2 References .
8、 .5 3 Definitions and abbreviations. . .6 Definitions . . 6 3.1 Abbreviations . 6 3.2 4 4.1 4.1.1 4.1.2 4.1.3 4.1.4 4.1.5 4.1.6 4.2 4.2.1 4.2.2 4.2.3 Parameters . .6 Signalling failure probability . 6 Call Setup Failure Probabi . 6 Call setup error probability . 8 Signalling route unavailabi . 8 Cal
9、l Premature Release Pr . 8 Call Release Failure Probability . 8 Percentage of unsuccessful call attempts . Call signalling delays . Call setup delay . Call Release Delay . Call Answer Signal Delay Annex A (normative): Annex B (informative): Summary of objectives 11 Signalling reference connection 12
10、 B. 1 General . 12 B.2 TIPHON call signalling elements . 12 B.3 Signal processing delays of TIPHON components 14 B.4 Total Signalling processing delay for call setup . 16 B.4.1 Intra-domain TIPHON connection . 17 B.4.2 Inter-domain TIPHON connections . . 17 B.4.3 Inter-domain connections involving T
11、IPHON and Switched Circuit . 18 B.4.4 Inter-domain connections involving roaming . 19 History . .20 ETSI 4 ETSI TS 102 024-9 V4.1.1 (2003-01) Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to the
12、se essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found in ETSI SR O00 3 14: “Intellectual Property Rights (7PRs); Essential, orpotentially Essential, IPRs notlJied to ETSI in respect ofETSI standards“, which is available from the ETSI Secretariat. Latest
13、updates are available on the ETSI Web server (5). All published ETSI deliverables shall include information which directs the reader to the above source of information. Foreword This Technical Specification (TS) has been produced by ETSI Project Telecommunications and Internet Protocol Harmonization
14、 Over Networks (TIPHON). The present document is part 9 of a multi-part deliverable covering the End-to-end Quality of Service in TIPHON Systems, as identified below: TR 102 024-1: TS 102 024-2: TS 102 024-3: TS 102 024-4: TS 102 024-5: TR 102 024-6: “General aspects of Quality of Service (QoS)“; “D
15、efinition of Speech Quality of Service (QoS) Classes“; “Signalling and Control of End-to-end Quality of Service (QoS) in a multi-media environment“; “Quality of Service Management“; “Quality of Service (QoS) measurement methodologies“; “Actual measurements of network and terminal characteristics and
16、 Performance parameters in TIPHON networks and their influence on voice quality“; “Design Guide for elements of a TIPHON connection from an End-to-end speech transmission performance point of view“; TS 102 024-9: “Call performance Classification voice)“; TS 102 024-10: “QoS Requirements for TIPHON T
17、erminals“. TR 102 024-7: ETSI 5 ETSI TS 102 024-9 V4.1.1 (2003-01) 1 Scope The present document, “TIPHON call performance classification“, specifies the signalling aspects associated with the control of End-to-end QoS within and between TIPHON domains for Voice over IP. It defies call and media proc
18、essing parameters, bounds on the values of these parameters and a possible classification system. The specified parameters apply to session and media flow set-up and close-down as well as to mid-session changes and include issues of signalling accuracy, signalling latency and signalling reliability.
19、 NOTE: The present document only applies to guaranteed QoS classes. Hence it is not applicable to the best effort class. 2 Re fe re nces The following documents contain provisions which, through reference in this text, constitute provisions of the present document. References are either specific (id
20、entified by date of publication andor edition number or version number) or non-specific. For a specific reference, subsequent revisions do not apply. For a non-specific reference, the latest version applies. Referenced documents which are not found to be publicly available in the expected location m
21、ight be found at htlu:/docbox.etsi.or:eerence. il ETSI TS 101 3 14: “Telecommunications and Internet Protocol Harmonization Over Networks (TIPHON) Release 3; Abstract Architecture and Reference Points Definition; Network Architecture and Reference Points“. 21 ETSI TS 101 882: “Telecommunications and
22、 Internet Protocol Harmonization Over Networks (TIPHON) Release 3; Protocol Framework Definition; General (meta-protocol)“. ITU-T Recommendation Y. 1530 (February 2002): “Call processing performance for voice service in hybrid IP networks“. ITU-T Recommendation Y. 1541 : “Network performance objecti
23、ves for IP-based services“ ITU-T Recommendation Q.766: “Performance objectives in the integrated services digital network application“. ITU-T Recommendation Q.706: “Message transfer part signalling performance“. ITU-T Recommendation Q.709: “Hypothetical signalling reference connection“. Directive 98
24、/10/EC of the European Parliament and of the Council of 26 February 1998 on the application of open network provision (ONP) to voice telephony and on universal service for telecommunications in a competitive environment. 31 41 51 61 71 SI ETSI 6 ETSI TS 102 024-9 V4.1.1 (2003-01) %T Bi 3 B j Definit
25、ions and abbreviations 3.1 De fi nit ions For the purposes of the present document, the following terms and definitions apply: unsuccessful call: call attempt to a valid number, properly dialled following dial tone, where neither called party busy tone, nor ringing tone, nor answer signal, is recogn
26、ized on the access line of the calling user within 30 s from the instant when the address information required for setting up a call is received by the network unsuccessful call ratio: ratio of unsuccessful calls to the total number of call attempts in a specified time period 3.2 Abbreviations For t
27、he purposes of the present document, the following abbreviations apply: CASD CPDP CPRP CRFP CRD CSD CSEP CSFP DNS FFS ISDN QOS SCN TE Call Answer Signal Delay Call Premature Disconnect Probability Call Premature Release Probability Call Release Failure Probability Call Release Delay Call Setup Delay
28、 Call Setup Error Probability Call Setup Failure Probability Domain Name Server For Further Study Integrated Service Digital Network Quality of Service Switched Circuit Network Terminal Equipment 4 Pa rame te rs In this clause a set of parameters and values is proposed for consideration for the spec
29、ification of the call completion performance classification. 4.1 Signal I i ng fa I u re proba bi I i ty 4.1 .I Call Setup Failure Probability The Call Setup Failure Probability (CSFP) is the ratio of total call setup attempts that result in call setup failure to the total call setup attempts in a p
30、opulation of interest. Figure 1 : Reference events occurring during successful call setup ETSI 7 ETSI TS 102 024-9 V4.1.1 (2003-01) With reference to figure 1, the CSFP is defined to occur on any call setup attempt in which either one of the following outcomes is observed prior to expiration of time
31、r Tmax: both events (b) and (d) do not occur; events (b) and (c) occur, but event (d) does not. Events (a) to (d) are observable events at specific reference points: (a) (b) (c) (d) illustrates setup at originating side; illustrates setup at terminating side; illustrates alerting at terminating side
32、; illustrates alerting at originating side. The reference points for TIPHON Release 4, corresponding to reference points Bi and Bj in figure 1 are specified in TS 101 3 14 i. The events occurring at those reference points correspond to specific TIPHON Metaprotocol messages as defined in TS 101 882 2
33、. In case of TIPHON Scenario O, reference point Bi in figure 1 relates to reference point C1 at the originating side, while Bj relates to reference point C1 at the terminating side. Reference point Bj relates to TIPHON reference point C3 in case of TIPHON scenario 1. Bi relates to TIPHON reference p
34、oint C3 in case of TIPHON scenario 2. The relationship between events (a) to (d) and the TIPHON Metaprotocol messages are as follows: (a) corresponds to the entry of U-CuZZRequest at reference point C1 between the originating terminal device and the SpoA for call control; corresponds to the exit ofD
35、-CuZZRequest at reference point C1 between the terminating SpoA and the terminating terminal device; corresponds to the entry of U-CuZZAZtert at reference point C1 between the terminating terminal device and the terminating SpoA; corresponds to the exit of D-CuZZReport at reference point C1 between
36、the originating SpoA and the originating terminal device. (b) (c) (d) NOTE 1 : The exact value of T, is for further study. NOTE 2: Call setup attempts that are cleared by the network portion as a result of incorrect performance or non-performance on the part of an entity outside the network portion
37、are excluded. NOTE 3: A call setup attempt can fail as a result of user blocking. Such failures are excluded from network performance measurement. Examples of user blocking include the following: - the called user issues a message to reject the call setup attempt; - the connect message reference eve
38、nt fails to occur at the originating MPT boundary due to the lack of a connect message reference event at the terminating MPT boundary; the called user delays excessively in generating the connect message reference event during the call period, with the result that a call is not established before t
39、he time-out; all channels at the called TE are in use. - - Objective: The Call Setup Failure Probability as defined above for a TIPHON network shall not exceed 3 x NOTE 4: This is a provisional value. The actual target value is for further study. ETSI 8 ETSI TS 102 024-9 V4.1.1 (2003-01) 4.1.2 Call
40、setup error probability Call setup error probability is the ratio of total call setup attempts that result in call setup error to the total call setup attempts in a population of interest. With reference to figure 1, a call setup error is defined to occur on any call setup attempt in which event (d)
41、 occurs, but event (c) does not occur at an appropriate boundary prior to expiration of timer T. Call setup error is essentially the case of a network-caused “wrong number“. It occurs when the network responds to a valid call request by erroneously establishing a call to a destination Terminal Equip
42、ment (TE) other than the one designated in the call request, and does not correct the error prior to the user information transfer. It may be caused, for example, by network operator administrative or maintenance actions. Call setup error is distinguished from successful call setup by the fact that
43、the intended called user is not contacted and not committed to the session during the call setup attempt. 4.1.3 Signalling route unavailability Important remark The signalling route unavailability parameter is only applicable to the SCN network portions of TIPHON systems. Hence it is not an End-to-e
44、nd parameter. The availability of a signalling route set is determined by the availability of the individual components of the signalling network and by the structure of the signalling network. (i.e. the arrangements for redundancy and alternative routing in the event of the unavailability of a comp
45、onent.) ITU-T recommendation 6 Q.706, clause 1.1, recommends that the availability of a signalling route set should be not less than 0,99998. This corresponds to a downtime of not more than ten minutes per year. 4.1.4 Call Premature Release Probability The Call Premature Release Probability (CPRP) f
46、or a network portion is the probability, in any given second, that a call experiences a premature disconnect generated within that portion. A premature disconnect is defined as an occurrence of a Disconnect request or a Release message 2 exiting the network portion at its originating or terminating
47、network boundary, either in the absence of a previous corresponding ModzJY or Release message occurring at the other boundary of the network; or when a premature disconnect stimulus occurs within the network boundaries and is transferred across its originating or terminating boundaries. The network
48、portion boundaries are the same (Bi, Bj) as shown in figure 1. They also correspond to the reference point between FE5 and FE6 for the originating side of a TIPHON network and the reference point between FES and FE9 for the terminating side. Objective: The Call Premature Disconnect Probability (CPDP
49、) as defined in this clause should not exceed 1,5 x NOTE: This is a provisional value. The actual target value is for further study. 4.1.5 Call Release Failure Probability The Call Release Failure Probability (CRFP) is the ratio of total call clearing failures to the total call clearing attempts in a population of interest. A call clearing failure is defined with reference to events at the originating and terminating boundaries of a network portion (Bi and Bj respectively as indicated in figure 1). A call clearing attempt occurs when a U-CaZZCZear message 2 ent
