1、ETSI ETRaL04 73 I 3400855 0027016 393 =- :CH N I CA L REPORT ETR 104 October 1993 Source: ETSI TC-SMG Reference: GSM 03.43 UDC: 621.396.21 Key words: European digital cellular telecommunications system, Global System for Mobile communications (GSM) European digital cellular telecommunications system
2、 (Phase 2); Support of Videotex (GSM 03.43) ETS I European Telecommunications Standards Institute ETS I Secretariat Postal address: 06921 Sophia Antipolis Cedex - FRANCE Office address: Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE Tel.: + 33 92 94 42 O0 - Fax: + 33 93 65 47 16 European
3、Telecommunications Standards Institute 1 993. All rights reserved. No part may be reproduced except as authorised by written permission. The copyright and the foregoing restriction on reproduction extend to all media in which the information may be embodied. ETSI ETRxLO4 73 3400855 O027037 22T Page
4、2 ETR 104:1993 (GSM 03.43 version 4.1.2) Whilst every care has been taken in the preparation and publication of this document, errors in content, typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to “ETSI Editing and Standards Approval Dept.“ at the ad
5、dress shown on the title page. ETSI ETR*L04 93 E 3400855 00270LB Lbb Page 3 ETR 104:1993 (GSM 03.43 version 4.1.21 Contents Foreword 5 . O SCOPE 7 1 References . 7 2 Definitions and abbreviations 8 3 SERVICE DEFINITION 8 3.1 Videotex service in the GSM context . 9 4 NETWORK ARCHITECTURE 9 4.1 4.2 4.
6、3 4.4 Videotex host directly connected to PSTN/ISDN 10 Videotex host accessed via PAD . 10 Videotex host accessed via VAP . 11 Videotex host accessed via VSC . 11 5 REFERENCE CONFIGURATION OF THE MOBILE STATION 12 6 Bearer Service configuration and settings 12 6.2 Terminal Adaption functions . 13 6.
7、1 Connection Types . 13 6.3 Signalling aspects . 13 6.4 Network interworking 13 History . 14 ETSI ETR*l04 93 3400855 0027039 OT2 Page 4 ETR 104:1993 (GSM 03.43 version 4.1.2) Blank page . ETSI ETR*lO4 73 3400855 0027020 814 Page 5 ETR 104:1993 (GSM 03.43 version 4.1.21 Foreword This ETSI Technical R
8、eport (ETRI has been produced by the Special Mobile Group (SMG) Technical Committee (TC) of the European Telecommunications Standards Institute (ETSI). This ETR describes the support of Videotext services within the European digital cellular telecommunication system (phase 2). # This ETR is an infor
9、mative document resulting from SMG studies which are related to the European digital cellular telecommunication system (phase 2). This ETR is used to publish material which is of an informative nature, relating to the use or the application of ETSs and is not suitable for formal adoption as an ETS.
10、This ETR correspond to GSM technical specification, GSM 03.43 version 4.1.2. The specification from which this ETR has been derived was originally based on CEPT documentation, hence the presentation of this ETR may not be entirely in accordance with the ETSVPNE rules. Reference is made within this E
11、TR to GSM Technical Specifications (GSM-TS) (NOTE). NOTE: TC-SMG has produced documents which give the technical specifications for the implementation of the European digital cellular telecommunications system. Historically, these documents have been identified as GSM Technical Specifications (GSM-T
12、S). These TSs may have subsequently become I-ETSs (Phase l), or ETSs (Phase 21, whilst others may become ETSI Technical Reports (ETRs). GSM-TSs are, for editorial reasons, stili referred to in current GSM ETSs. . ETSI ETR*304 93 = 3400855 0027023 750 Page 6 ETR 104:1993 (GSM 03.43 version 4.1.2) Bla
13、nk page ETSI ETRxL04 93 3400855 O027022 697 Page 7 ETR 104:1993 (GSM 03.43 version 4.1.2) O SCOPE This Report describes the support of Videotex service within the GSM PLMN network, taking into account the service definition as per CCITT Rec. F.300 and Bearer Services specified in TS GSM 02.02 for a
14、GSM PLMN. 1 References This ETR incorporates by dated and undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of
15、 these publications apply to this ETR only when incorporated in it by amendment or revision. For undated references, the latest edition of the publication referred to applies. i11 ETS 300 072: “Terminal Equipment (TE): Videotext presentation layer protocol Videotext presentation layer syntax“. Pl ET
16、S 300 073: “Videotext presentation layer data syntax; Geometric Display“. 31 ETS 300 075: “Terminal Equipment (TE): Videotext processable data“. i41 i51 i61 ETS 300 079: “Integrated Services Digital Network (ISDN); Syntax based Videotex End-to-end protocols circuit mode DTE-DTE“ . ETS 300 080: “Inte
17、grated Services Digital Network (ISDN); Lower layer protocols for telematic terminals“. ETS 300 21 8: “Integrated Services Digital Network (ISDN); Syntax based Videotex Lower layer protocols using packet mode (X.31 Case A abd Case BI“. ETS 300 221: “Terminal Equipment (TE): Syntax based Videotex Low
18、er layer protocols using packet mode access over the Public Switched Telephone Network (PSTN)“. i81 ETS 300 222: “Framework of Videotext Terminal Protocols“. i91 11 11 1121 il 31 i141 i1 51 ETS 300 223: “Terminal Equipment (TE): Syntax based Videotex End-to-end protocols“. GSM O1 .O4 : “European dig
19、ital cellular telecommunication system (Phase 2); Definitions, abbreviations and acronyms“. GSM 02.02 : “European digital cellular telecommunication system (Phase 2); Bearer Services (BS) supported by a GSM Public Land Mobile Network (PLMN)“. GSM 03.1 O : “European digital cellular telecommunication
20、 system (Phase 2); GSM Public Land Mobile Network (PLMN) connection types“. GSM 03.70 : “European digital cellular telecommunication system (Phase 2); Routeing of calls to/from Public Data Networks (PDN)“. GSM 07.01 : “European digital cellular telecommunication system (Phase 2); General on Terminal
21、 Adaptation Functions (TAF) for Mobile Stations (MC)“. GSM 07.02 : “European digital cellular telecommunication system (Phase 2); Terminal Adaptation Functions (TAF) for services using asynchronous bearer capabilities“. ETSI ETRr104 73 3400855 0027023 523 = Page 8 ETR 104:1993 (GSM 03.43 version 4.1
22、.2) 161 i1 71 I 81 il 91 r201 211 221 231 2 GSM 07.03 : “European digital cellular telecommunication system (Phase 2); Terminal Adaptation Functions (TAF) for services using synchronous bearer capabilities“. GSM 08.20 : “European digital cellular telecommunication system (Phase 2); Rate adaption on
23、the Base Station System - Mobile-services Switching Centre (BSS - MSC) interface“. CCITT Recommendation E. 163: “Numbering plan for the international telephone service“. CCITT Recommendation E.164: “Numbering plan for the ISDN era“. CCITT Rec. F.300: “Videotext service“. CCITT Rec. X.31: “Support by
24、 Packet Mode Terminal Equipment in ISDN“. CCITT Rec. X.32: “Interface between Data Terminal Equipment (DTE) and Data Circuit Terminating Equipment (DCE) for terminals operating in Packet Mode and accessing a PSPDN through a PSTN or an ISDN or a CSPDN“. CCITT Rec. X.75: “Packet -switched signalling s
25、ystem between public networks providing data transmission services“. L Definitions and abbreviations In addition to those below, definitions used in this specification are listed in GSM 01.04. AU Access Unit SBVT Syntax Based Videotex Terminal VAP Videotex Access Point vsc Videotex Service Centre VT
26、X host The computer dedicated to Videotex service 3 SERVICE DEFINITION The Videotex service is an interactive service that by means of proper access points and standardized procedures provide the access to data base information stored in host computers external to the PLMN, via public telecommunicat
27、ion networks. The basic elements considered for a Videotex system are: the user terminal the Videotex host computer or Videotex service access function (PADNAPNSC) - the telecommunication network - The specific features that are relevant to the service are: - a Videotex call is usually a mobile orig
28、inated call, but mobile terminated call are supported as well; it is an interactive service; the requested information is generally in form of text and/or pictures; the information access is under the control of the user; there are different Videotex syntax standards , depending on high layer attrib
29、utes of the service (Profile 1, Profile 2, Profile 3, Profile 4, “ASCII“), ETS 300 073 (Geometric Display), ETS 300 075 (Processable Data), ETS 300 177 (Photographic Syntax). - - - Common end-to-end protocols for syntax-based Videotex are specified in ETS 300 223 and ETS 300 079. ETSI ETR*kL04 93 a
30、3400855 0027024 4bT Page 9 ETR 104: 1993 (GSM 03.43 version 4.1.2) 3.1 Videotex service in the GSM context Fig.1 shows the basic concept underlying all the GSM Bearer Services, as defined in TS GSM 02.02. The most general case is the GSM PLMN interworking with a Transit Network (PSTN and/or ISDN, no
31、ne), interconnected to a Terminating Network (PSPDN, PSTN and/or ISDN). Fig. 1103.43 GSM Bearer Service scheme As the information transfer mode attribute on the PLMN is always “Circuit“, and the information transfer capability is always “UDI“, the end-to-end Bearer Service attributes depend mainly o
32、n the combination of Transitnerminating networks utilized in the overall connection. This means that both “circuit mode“ and “packet mode“ bearer services are appropriate for Videotex on a GSM PLMN; in particular (see Table 4/GSM 02.02): - - - - BS 21 to BS 26, covering data circuit duplex asynchron
33、ous rates up to 9600 bit/s; BS 41 to BS 44 covering PAD access asynchronous rates up to 9600 bit/s; BS 31 to BS 34, covering data circuit duplex synchronous rates up to 9600 bit/s; BS 51 to BS 53, covering packet mode synchronous rates up to 9600 bit/s; Concerning packet mode services, the GSM PLMN
34、network supports both: - basic packet/PAD mode, allowing the GSM users to access dial-in asynchronous (PAD) or synchronous (AUPH) ports of a PSPDN (to which individual subscriber is subscribed to), using respectively BS 2x or BS 3x GSM Bearer Services; - dedicated packet/PAD mode, allowing the GSM u
35、sers a “seemingly immediate“ access to the PSPDN word, without any explicit intermediate passage on the transit network to access the PSPDN port; BS 4x and BS 5x are used in this case. 4 NETWORK ARCHITECTURE 1 As identified in CCITT Rec. F.300, various configurations are permitted for the structure
36、of a Videotex system. A terminal can be connected to a Videotex host server: - - - - directly by a telecommunication network; via a Packet Assembly/Disassembly (PAD); via a Videotex Access Point (VAP); via a Videotex Service Centre (VSC) which may also act as a Videotex host. All these configuration
37、s can be supported by a GSM PLMN, as detailed in the following network schemes. ETSI ETR*kl04 93 m 3YOOB55 0027025 3Tb m anca host MSCAWF Page 10 ETR 104:1993 (GSM 03.43 version 4.1.2) ISDN 4.1 Videotex host directly connected to PSTNIISDN VIX When it is assumed that the Videotex centre is directly
38、connected to the PSTNASDN, the network scheme is as shown in Fig.2 /03.43. T- A 0 Fig.2/03.43 VTX host directly connected to PSTN/ISDN With reference to the general scheme in Fig.1/03.43, the terminating network (in this case working as transit network as well) uses a 3.1 kHz audio information trans
39、fer capability; at both ends of the terminating network (MSCAWF and VTX host) a voiceband modem is allocated, whose actual bit-rate is selected in the BC-IE at Call Establishment, within the GSM standard rates (maximun 9600 bit/s). BS 2x series apply in this case. 4.2 Videotex host accessed via PAD
40、Fig. 3/03.43 summarizes this configuration, outlining all possible network alternatives. The main service alternative concerns basic/dedicated PAD access. In case of basic PAD access, the transit network (PSTN and/or ISDN) is utilized to access the PAD, remotely located with respected to MSC/IWF; th
41、e Videotex customer has to make a E.164 Call to the desired PAD, then a second step is necessary to access the Videotex host. BS 2x are utilized in this case; the information transfer capability on the transit network is 3.1 kHz audio (PSTN or ISDN). * In case of dedicated PAD access, two options ar
42、e still possible (see GSM 09.05): - the PAD is remotely located with respect to the IWF, and automatically connected to IWF, via a dedicated circuit or a data circuit on a public network (PSTN or ISDN), so that the Videotex user has “direct“ access to the PAD; the PAD is located in the MSC/IWF and c
43、onnected to the PSPDN via X.25 or X.75. - ETSI ETR*L04 93 O 3400855 0027026 232 O TE Page 11 ETR 104:1993 (GSM 03.43 version 4.1.2) u MT The dedicated PAD access provides the shortest possible connection from the PLMN to a PAD for both home subscribers staying in the home PLMN and foreign subscriber
44、s roaming in a visited PLMN. BS 4x are utilized for dedicated PAD access. 4.3 Videotex host accessed via VAP Fig. 4/03.43 summarizes this configuration, outlining all possible network alternatives. I (Circuit mode) Y 3.1 kHrudio - proprietary Fig. 4/03.43 VTX host accessed via VA? Circuit Mode acces
45、s to the VAP via ISDN transit network (and BS 3x1 is according to ETS 300 079 and ETS 300 080. Concerning Packet Mode access to VAP, again the main choice concerns basiddedicated packet mode. In case of basic packet mode configuration, the transit network is utilized to access a conventional X.32 di
46、al port in the PSPDN or a PH function (X.31 Case A), remotely located with respected to MSC/IWF and functionally operating as VAP with respect to Videotex service. The Videotex customer has to make a E.164/E.163 Call to the desired dial port/PH, then a second step is necessary to access the Videotex
47、 host. BS 3x are utilized in this case; the information transfer capability on the transit network is 3.1 kHz audio (PSTN or ISDN) or UD1 (ISDN). In case of dedicated packet mode, the PH is logically part of the PLMN. The interface between the PH and the PSPDN is X.75 or proprietary; two options are
48、 still possible for its physical location: - - the PH is remotely located with respect to the IWF; the PH (VAP function) is located in the PLMN. BS 5x are utilized in this case. The dedicated packet mode provides the shortest possible connection from the PLMN to a PSPDN for both home subscribers sta
49、ying in the home PLMN and foreign subscribers roaming in a visited PLMN. 4.4 Videotex host accessed via VSC Though the Videotex Access Function is explicitly separate with respect to the Videotex host, no impact results on the overall Network architecture. Actually the VSC can be considered a front-end function of the same Videotex host (either physically separate or integrated), so that all the above configuration in principle apply. ETSI ETR*O 93 m 3400855 0027027 177 m Page 12 ETR 104:1993 (GSM 03.43 version 4.1.2) In particular the network schemes in Figures 3, 4/03
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