1、ETSI TR 102 021-3 1.1.1 (2001-12) Technical Repor Terrestrial Trunked Radio (TETRA); User Requirement Specification TETRA Release 2; Part 3: Codec 2 ETSI TR 102 021-3 V1.l.l (2001-12) Reference DTR/TETRA-O1076 Keywords TETRA, user, Codec ETSI 650 Route des Lucioles F-O6921 Sophia Antipolis Cedex - F
2、RANCE 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 7803/88 Important notice Individual copies of the present document can be downloaded from: http:l/w.etsi .orq The present document m
3、ay 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 version is the Portable Document Format (PDF). In case of dispute, the reference shall be the printing on ETSI printers of the PDF ve
4、rsion kept on a specific network drive within ETSI Secretariat. Users of the present document should be aware that the document may be subject to revision or change of status. Information on the current status of this and other ETSI documents is available at 3 If you find errors in the present docum
5、ent, send your comment to: Cori vriaht Notifica tion No part may be reproduced except as authorized by written permission. The copyright and the foregoing restriction extend to reproduction in all media. O European Telecommunications Standards Institute 2001. All rights reserved. ETSI 3 ETSI TR 102
6、021-3 V1.l.l (2001-12) Contents Intellectual Property Rights . . . . . .4 Foreword Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 1 2 3 3.1 3.2 4 4.1 4.2 4.3 4.4 4.5 4.5.1 4.5.2 4.5.3 Scope . References . . . .5 Definitions and abbreviations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 . 6 . 6 User Requirement Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 . 6 . 6 . 7 . 7 . 8 . 8 . 9 . 9 Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . Method of analysis Need for new codec . Rel
10、ative importance of the TETRA 2 codec Improved end-to-end delay performance . . . . . . . . . . . . . . Codec specific performance figures Fundamental requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Voice quality improvement over existing code Equal or better immunity to backg
11、round noise 4.5.4 Interworking with GSM/UMTS (No double vocodmg) . 10 4.6 Interoperability with lower rate, standard codec . . 10 4.7 Timescales for the new codec . 10 Annex A: Bibliography 11 History 12 ETSI 4 ETSI TR 102 021-3 V1.l.l (2001-12) Intellectual Property Rights IPRs essential or potenti
12、ally 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 O00 314: “Intellectual Property Rights (7PRs); Essential, orpotentially Essential, IP
13、Rs notlJied to ETSI in respect ofETSI standards“, which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (5). 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 existe
14、nce of other IPRs not referenced in ETSI SR O00 3 14 (or the updates on the ETSI Web server) which are, or may be, or may become, essential to the present document. Foreword This Technical Report (TR) has been produced by ETSI Project Terrestrial Trunked Radio (TETRA). The present document is part 3
15、 of a multi-part deliverable covering the User Requirement Specifications (URSS) for TETRA Release 2, as identified below: Part 1 : “General Overview“; Part 2: “High Speed Data“; Part 3: “Codec“: Part 4: “Air Interface Enhancements“; Part 5: “Interworking and Roaming“; Part 6: Part 7: “Security“. “S
16、ubscriber Identity Module (SIM)“; I n t rod uct ion The TETRA Release 2 suite of standards was mandated in the new Terms of Reference (TOR) for ETSI Project TETRA approved at ETSI Board meeting number 28 (Board 28) on 6th September 2000 78. Its aim was to enhance the services and facilities of TETRA
17、 in order to meet the emerging user requirements, utilize new technologies and, by maintaining the competitiveness with other wireless technologies, increase the ftureproofness of TETRA as the standard for PMR and PAMR worldwide. The approved programme for TETRA Release 2 covers five work areas, nam
18、ely: high speed data; speech coding; air interface enhancements; intenvorking and roaming; SIM The present document provides the User Requirement Specification for Speech Coding. The URS is required by Working Group 5 (WG5) of EPT for the new voice codec (or codecs). ETSI 5 ETSI TR 102 021-3 V1.l.l
19、(2001-12) 1 Scope The present document provides the user requirements for enhancement of Codec. The main requirements in such an enhancement are the following: improved end-to-end delay performance; voice quality improvement over the existing TETRA codec; equal or better immunity to background noise
20、; intenvorking with GSMLJMTS (no double vocoding); interoperability with the existing TETRA codec; The present document is applicable to the specification of TETRA Release 2 equipment. The user requirements contained in this URS are described in non-technical terms and are based on an analysis of th
21、e results for the voice codec from the TETRA Release 2 Market Questionnaire (see bibliography), described in TR 102 021-1 i, clauses 4.2 and4.3. 2 Re fe re nces For the purposes of this Technical Report, the following references apply: il ETSI TR 102 021-1 : “Terrestrial Trunked Radio (TETRA); User
22、Requirement Specification TETRA Release 2; Part 1 : General Overview“. 21 ETSI TR 102 02 1-2: “Terrestrial Trunked Radio (TETRA); User Requirement Specification TETRA Release 2; Part 2: High Speed Data“. ETSI TR 102 02 1-4: “Terrestrial Trunked Radio (TETRA); User Requirement Specification TETRA Rel
23、ease 2; Part 4: Air Interface Enhancements“. 31 41 ETSI TR 102 02 1-5: “Terrestrial Trunked Radio (TETRA); User Requirement Specification TETRA Release 2; Part 5: Intenvorking and Roaming“. ETSI TR 102 02 1-6: “Terrestrial Trunked Radio (TETRA); User Requirement Specification TETRA Release 2; Part 6
24、: Subscriber Identity Module (SIM)“. ETSI TR 102 02 1-7: “Terrestrial Trunked Radio (TETRA); User Requirement Specification TETRA Release 2; Part 7: Security“. B28 (00)12: “Extension of EPT Terms of Reference to Enable TETRA Release 2“. B28 (00)24 Rev 2: “Summary minutes, decisions and actions from
25、28th ETSI Board Meeting, Sophia Antipolis, 5-6 September 2000“. 51 61 71 SI ETSI 6 ETSI TR 102 021-3 V1.l.l (2001-12) 3 3.1 Definitions and abbreviations De fi nit ions For the purposes of the present document, the following terms and definitions apply: TETRA Release 2: Work Programme with new terms
26、 of reference within ETSI Project TETRA to enhance the services and facilities of TETRA in order to meet new user requirements, utilize new technology and increase the longevity of TETRA within the traditional market domains of PMR and PAMR interworking: where TETRA users on one system can communica
27、te with mobile users on another system (which could be TETRA or different), as long as they operate within their home TETRA network, i.e. they cannot roam into another system 3.2 Abbreviations For the purposes of the present document, the following abbreviations apply: EPT ETSI GSM NATO PS PAMR PMR
28、TETRA UMTS URS WG ETSI Project TETRA European Telecommunications Standards Institute Global System for Mobile communications North Atlantic Treaty Organization Public Safety Public Access Mobile Radio Professional (or Private) Mobile Radio TErrestrial Trunked RAdio Universal Mobile Telecommunication
29、s System User Requirement Specification EPT Working Group 4 4.1 User Requirement Specification Method of analysis This URS has been defined using the feedback of users and possible users to the TETRA Release 2 Market Questionnaire (see bibliography). The individual responses from different user orga
30、nizations have been weighted in accordance with the size of the TETRA system planned by the responder. The number of base stations and terminals obtained from user feedback form the basis to determine the user specific weighting factor. In order to compensate for the fact that the number of replies
31、to the questionnaire is not evenly distributed over all market segments, a second, segment specific weighting factor, has been taken into account. The weighted results of the respondents have been grouped in segments in a way that commonalties could be analysed. So far users from the PS, PAMR and De
32、fence segments have provided answers to the questionnaire. The requirement analysis considers both feature requirements and requested time scales for the availability of the new voice codec(s). 4.2 Need for new codec The TETRA Release 1 voice codec has been found to be appropriate for PMR and PAMR v
33、oice communications. This is particularly the case in the PS sector where 90 % of the user responses indicate that a new codec is not required. However the move towards UMTS/3G and the large diffusion of TETRA in different market segments have created demands for additional features and performance
34、figures. It is envisaged that these new requirements will lead to standardization of one or more new codecs for TETRA Release 2 networks. The major aim of these new codecs is to enhance the voice quality for TETRA and to allow efficient interworking with UMTS/3G networks. The TETRA standard can supp
35、ort up to four voice codecs. This flexibility also means that new terminals could operate with the existing TETRA codec and additional new codec(s). ETSI 7 ETSI TR 102 021-3 V1.l.l (2001-12) 4.3 Relative importance of the TETRA 2 codec Users were asked to assign a relative importance figure to all o
36、f the new features considered for standardization in TETRA Release 2. The weighted overall importance given to new codec(s), in relation to other features of TETRA Release 2, by users among all market segments is 10 % (see figure 1). Figure 1: Weighted overall importance In general we can conclude t
37、hat the relative importance of the new codec is moderate. 4.4 Improved end-to-end delay performance End-to-end delay is a key factor in the perceived quality of voice communication. Although the end-to-end delay of the TETRA 1 codec itself is considered to be adequate, some 23 % of weighted votes ov
38、er all market segments do require an improvement in the overall end-to-end delay (see figure 2). This requirement is slightly more important for users in the Public Safety segment where 3 1 % of votes have been assigned (see figure 3). Figure 2: Weighted codec requirements (all market segments) ETSI
39、 8 ETSI TR 102 021-3 V1.l.l (2001-12) Figure 3: Weighted codec requirements (Public Safety) The end-to-end delay incurred by new codecs shall not exceed the delay performance of the TETRA 1 codec. NOTE: The end-to-end voice delay performance over a TETRA network is a combination of several factors w
40、ith the frame structure of TETRA being the most significant. For this reason, it is recommended that improved end-to-end delay shall be included as a user requirement in the TETRA 2 Air Interface Enhancement URS 3. 4.5 Codec specific performance figures 4.5.1 Fundamental requirements The following t
41、hree fundamental requirements are considered to be purely codec specific: voice quality improvement; immunity to background noise; interworking with GSMIUMTS. Further to what has been said in clause 4.4, end-to-end delay has not been considered as one of the above codec specific performance requirem
42、ents. The relative importance of these three requirements can be seen from figures 4 and 5. ETSI 9 ETSI TR 102 021-3 V1.l.l (2001-12) Figure 4: Weighted codec requirements excluding end-to-end delay (PAMR) Figure 5: Weighted codec requirements excluding end-to-end delay (Public Safety) The result of
43、 the questionnaire responses to these three performance figures is given in the next clauses. It is worthwhile to note that the relative importance given by the users does not substantially differ amongst the various market segments. 4.5.2 Voice quality improvement over existing codec It can be conc
44、luded from responses to Questionnaire that improved voice quality is considered highly important in all market segments, although it is considered more important by PAMR users than by PS users. 4.5.3 Equal or better immunity to background noise Equal or better immunity to background noise with respe
45、ct to the TETRA 1 codec is considered to be of moderate importance. ETSI 10 ETSI TR 102 021-3 V1.l.l (2001-12) 4.5.4 Interworking with GSM/UMTS (No double vocoding) Direct interworking with GSMLJMTS networks, without double vocoding is considered to be of high importance. 4.6 Interoperability with l
46、ower rate, standard codec The military segment that is considered a potential future user of TETRA technology has raised this requirement. NATO is in the selection phase of a new codec for use in military environments. The deadline for this selection process is end-2001 .The key-requirement of NATO
47、is low bandwidth (e.g. 2,4/1,2 kbps). Concerning voice quality requirement, the primary objective is intelligibility in high-noise environments. It is believed that the codec that meets the requirements of TETRA users in non-military market segments does not satisSl the military requirements and vic
48、e versa. Therefore it is suggested to evaluate the feasibility of including the NATO codec candidate in the TETRA Release 2 standard, subject to its specification being available within the standardization timefiame. 4.7 Timescales for the new codec Users have been asked in the Questionnaire about a
49、vailability in time of the TETRA Release 2 codec(s). Responses are spread over a 5-year period. As a tentative interpretation of these results we conclude that this requirement is dependent on market sectors. The availability requirements from different segments are given in figure 6. It is evident that the PAMR users require the new TETRA Release 2 codecs by 2002 whilst the majority of PS users do not require such codecs before the 2005. As far as the military segment is concerned the user has given n
