1、3404583 0078645 b4 W Released: July I, 1993 GSM 03.44 Version: 4.0.0 Date: October, 1992 Work Item No: Key words: European digital cellular telecommunication system (phase 2); Support of Teletex in a GSM PLMN ETSI European Telecommunications Standards Institute ETSI Secretariat: Route des Lucioles,
2、F-O6921 Sophia Antipolis Cedex . France TP. + 33 92 94 42 O0 TF. + 33 93 65 47 16 Tx. 47 O0 40 F This is an unpublished work the copyright in which vests in the European Telecommunications Standards Institute. All rights reserved. The information contained herein is the property of ETSI and no part
3、may be reproduced or used except as authorised by contract or other written permission. The copyright and the foregoing restriction on reproduction and use extend to all media in which the information may be embodied. 3404583 0078bYb 8TO W Page 3 GSM 03.44 - version 4.0.0 * List of contents: O. Scop
4、e 1. References 2. Abbreviations 3. Introduction 3.1. Teletex Service Definition 3.2. Context for the Support of Teletex in a GSM PLMN 3.3. Reference Configuration of a Teletex Mobile Station 4. Interworking for Teletex Support 4.1. Global Network Configuration for Teletex 4.2. Network Interworking
5、Scenarios 4.3. Mobile-to-mobile Communication 4.4. Use of GSM Supplementary Services 4.5. High Layer Compatibility Information Element Annex: Teletex Document Store Number of Daqes: 15 Previous page is blank - 3404583 0078bg7 737 Page 5 GSM 03.44 - version 4.0.0 O. ScoDe This report describes the su
6、pport of the teletex service by a GSM PLMN. 1. References This technical report incorporates by dated or 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,
7、subsequent amendments to or revisions of any of these publications apply to this technical report only when incorporated in it by amendment or revision. For undated references the latest edition of publication referred to applies. F.200 series T.300 series X.200 series X.300 series X.400 series T.0
8、series T.65 series X.l series X.40 series V series GSM TS 02.02 GSM TS 02.03 GSM T? 03.10 GSM 03.70 CCITT Fascicle 11.5 Telematic, data transmission and teleconference services-Operations and quality of service CCITT Fascicle VII.5 Terminal equipment and protocols for telematic services CCITT Fascic
9、le VIII.4 Data communication networks: services an facilities, interfaces CCITT Fascicle VIII.6 Data communication networks: interworking between networks, mobile data transmission systems,internetwork management CCITT Fascicle VIII.7 Data communication networks: message handling systems CCITT Fasci
10、cle VII.3 Terminal equipment and protocols for te 1 ema t i c services (T.60,T.61,T.62) CCITT Fascicle VII.5 terminal equipment and telematic services (T.70) CCITT Fascicle VIII.2 Data communication networks: services and facilities, interfaces (X. 21,X.31,X. 32) CCITT Fascicle VIII.3 Data communica
11、tion networks : transmission, singnalling and switching, network aspects, maintenance and administrative arrangements( X.52,X.71,X.75) CCITT Fascicle VIII.l Data communication over the telephone network (V.110) Bearer services supported by a GSM PLMN Teleservices supported by a GSM PEMN GSM PLMN con
12、nection types Routing of calls to/from PDNs General on terminal adaptation functions for GSM 37.01 mobil stations GSM TS 07.03 Terminal adaptation functions for services using GSM TS 09.01 General network interworking scenarios synchronous bearer capabilities GSM TS 09.04 Interworking GSM TS 09.06 I
13、nterworking support of between the PLMN and rne CSPDN between a PLMN and a PSPDN/ISDN for packet switched data transmission Previous page is blank W 3404583 0078646 673 Page 6 GSM 03.44 - version 4.0.0 services PLMN and the ISDN or PSTN GSM TS 09.07 General requirements on interworking between the 2
14、. Abbreviations (alphabetical order) AU BSS CF CSPDN CUG FR GMSC HDLC HLC HLR HPLMN HR ISDN IWF IWU LAPB LLC MS MSC MSRN MT PDN PH PLMN PLP PSPDN PSTN RLP RPOA TA TAF TDS TE TID Ttx Ttx-MS Ttx-TE Tx VCS VLR VPLMN Access Unit (CCITT X.31) Base Station System Conversion Facility (for Ttx/Tx service in
15、terworking) Circuit Switched Public Data Network Closed User Group Full Rate Channel Gateway MSC High Level Data Link Control Higher Layer Compatibility Home Location Register Home PLMN Half Rate Channel Integrated Services Digital Network Interworking Function Interworking Unit (CCITT X.71 / CCITT
16、X.75) Link Access Procedure Balanced Lower Layer Compatibility Mobile Station Mobile Service Switching Centre Mobile Station Roaming Number Mobile Termination Public Data Network Packet Handler (CCITT X.31) Public Land Mobile Network Packet Layer Protocol Packet Switched Public Data Network Public S
17、witched Telephone Network Radio Link Protocol Recognized Private Operating Agency Terminal Adaptor Terminal Adaptation Function Teletex Document Store Terminal Equipment Terminal Identification (CCITT F.200) Teletex Teletex Mobile Station (i.e. a MS with Ttx terminal connected) Teletex Terminal Equi
18、pment Telex Virtual Circuit Service Visitor Location Register Visited PLMN 3. Introduction 3.1. Teletex Service Definition The teletex (Ttx) service is an international telematic service 3404583 0078649 50T Page 7 GSM 03.44 - version 4.0.0 as defined in CCITT F.200-series of recommendations. As an e
19、ssential characteristic it provides a basic level of compatibility between all terminals participating in the service. Normally the service shall operate on a fully automatic basis and be open continuously. Teletex subscriber equipment shall be in accordance with the CCITT recommendations T.60, T.61
20、, T.62, and T.70. Especially it shall (a) have unique terminal identifications (TID), (b) be able to send and/or receive documents without terminal operator intervention, (c) have a certain set of indications to the terminal operator, (d) in principle be able to accept calls continuously, if call nu
21、mbers are published in the directories (In order to meet this requirement, it is allowed to use a document storage facility which can be network or customer premises based.) (e) be able to prepare documents being forwarded to the telex service using appropriate conversion facilities within the netwo
22、rk. According to the CCITT T.70 (version 1988) the teletex service may be offered in the following types of networks: (a) the Circuit Switched Public Data Network (CSPDN), (b) the Packet Switched Public Data Network (PSPDN), (c) the Public Switched Telephone Network (PSTN) and (d) the Integrated Ser
23、vices Digital Network (ISDN). The interworking between the different networks may be based on CCITT X.300-series of recommendations. 3.2. Context for the Support of Teletex in a GSM PLMN Considering that (a) international roaming of teletex subscribers must be supported, (b) all CEPT countries have
24、PSPDNs, (c) PSPDNs providing an access unit AU (X.31 case A) support procedures according to CCITT X.32, W 3404583 0078b50 22% W Page 8 GSM 03.44 - version 4.0.0 each CEPT country will have an ISDN, ISDNs may provide the VCS, the teletex service supported by a GSM PLMN can participate in the interna
25、tionally available teletex service, i.e. all teletex terminals, for which a call number is published in the service directory, can communicate with each other, following basic assumptions will apply: In principle no specific network interworking functions shall be necessary in a VPLMN for the suppor
26、t of teletex. No specific additional bearer service other than those defined in GSM TS 02.02 shall be needed in a VPLMN. Ttx specific IWFs, if any, must not have any impact on the MS of a roaming subscriber. Both PSTN and ISDN, if available, may be used as a transit network to the PSPDN. Presently n
27、o service interworking (especially for telex) directly from the GSM PLMN is provided. Conversion facilities within the fixed networks shall be used. Note: A mobile terminated call may be forwarded to a document storage facility called teletex document store (TDS), if available, when the addressed Tt
28、x-MS is temporarily unable to accept a call. The provision and the location of such a store is at the PLMN operators discretion (e.g. within the PLMN or within a fixed network). 3909583 0078651 Lb8 Page 9 GSM 03.44 - version 4.0.0 3.3. Reference Confiauration of a Teletex Mobile Station The referenc
29、e configuration (figure 1 / GSM 03.44) is equivalent to those configurations in GSM TS 07.03. An explicit TA may be used between the R- and the S-interface reference point. The configuration TE1-MT1 can only be supported by means of a specialized TAF including protocol conversion, if necessary, to g
30、uarantee the compatibility at the radio interface. For the time being this may be a national option. Further configurations may be possible. - Teletex Mobile Station (Ttx-MS) - Fisure 1 / GSM 03.44:Reference Configuration of a Teletex Mobile Station W 3404583 0078652 OT4 W Page 10 GSM 03.44 - versio
31、n 4.0.0 4. Interworkins for Teletex Sumort 4.1. Global Network Confisuration for Teletex Presently teletex is offered in the CSPDN, the PSPDN, the PSTN, and in the very next future in the ISDN. Figure 2 / GSM TS 03.44 shows the different networks to which a GSM PLMN may have to interwork, when suppo
32、rting the communication between teletex terminals. r ISDN / PSTN - *I _- -I- TDS I optional function (ref. annex) *) This interworking requires a Ttx-specific IWF within the PLMN ( see section 4.2) Fisure 2 / GSM 03.44: Global Network Configuration For service interworking with telex the national fi
33、xed network based Ttx/Tx convercion facility (CF) shall be used. For roaming subscribers this results in an international access. Whether the conversion facilities are prepared to receive such calls is not in the scope of this report. 3404583 O078653 T30 = 1 - BSS MSC - IWF - p-HYp Page 11 GSM 03.44
34、 - version 4.0.0 ISDN/ - PSPDN PSTN 4.2. Network Interworkina Scenarios The following network interworking scenarios may be derived from the global network configuration. Some scenarios allow for different implementations of an IWF. For the interworking functions needed between the PLMN and the diff
35、erent networks refer to GSM TS 09.06 and 09.07. The choice of interworking scenario and the IWF is at the PLMN operators discretion. The PLMN and the particular PDN may be connected directly or via (a) transit network(s) . (2) Interworking PLMN to PSPDN via ISDN Fiaure 3 / GSM 03.44: Network Interwo
36、rking Scenarios - 3404583 0078654 977 W -1 - FHFP LBSS- MSC - IWF - Page 12 GSM 03.44 - version 4.0.0 ISDN - CSPDN (5) Direct interworking PLMN to CSPDN with protocol conversion FHF ieH&HydQ pm- Note: This is a national option, because specific functionality in the IWF is needed . Note: This is a na
37、tional option, because specific functionality in the IWF is needed . (7) Direct interworking PLMN to ISDN with protocol conversion i- BSS MSC ISDN 1 Note: Presently this interworking case applies only to the Ttx service within an ISDN using T.70-CSPDN protocols. Ficrure 3 / GSM 03.44 contd For the i
38、nterworking PLMN to the different networks the following GSM TS apply: PLMN to CSPDN: GSM TS 09.04 PLMN to PSPDN: GSM TS 09.06 PLMN to PSTN/ISDN: GSM TS 09.07 3404583 0078655 803 High layer characteristics Identification Page 13 GSM 03.44 - version 4.0.0 Teletex (basic teletex) Document application
39、profile for formatted mixed mode *) 4.3. Mobile-to-mobile Communication A communication from a mobile to another mobile is treated like a call from/to a fixed network subscriber, e.g. using the packet functions as per GSM TS 09.06. 7 Document application profile for processable mode *) 4.4. Use of G
40、SM Sumlementarv Services For supplementary services refer to TS 09.06 and TS 09.04.In additioncall forwarding supplementary services may be used to forward a mobile terminated call to a TDS (refer annex). 4.5. Hish Laver ComDatibilitv Information Element Mobile subscribers using the teletex service
41、may code the high layer compatibility information element as described below. Depending on the network implementation this indication may be used by the network for teletex specific requirements. Depending on the signalling capabilities of the fixed network the high layer compatibility information e
42、lement may not be included in the call setup message to the MS in case of a mobile terminated call. Therefore a Ttx-MS shall not reject an incoming call due to the absence of this element. f) for future use Table 1 / GSM 03.44: High layer compatibility information element for teletex = 3404583 00786
43、56 74T = Page 14 GSM 03.44 - version 4.0.0 ANNEX Teletex Document Store 1. Introduction A teletex document store (TDS) is an optional functional unit, the provision of which is necessary, if the PLMN operator wishes that mobile terminated calls should not fail due to temporary absence of a Ttx-MS. A
44、 particular TDS can be in charge of one or more PLMNs. Each PLMN is the HPLMN of the Ttx- MSs, that TDS is acting for. The provision and location of a TDS is at the PLMN operators discretion (e.g. within the HPLMN or within a fixed network). It is not intended to receive documents instead of the Ttx
45、 terminal in general, but only occasionally, if the MS does not accept a call. This may include e.g. temporary user initiated unconditional call forwarding. Whether use of unconditional call forwarding is required in general, when the Ttx-MS is roaming in a another GSM PLMN, depends e.g. on the sign
46、alling capabilities of the concerned networks. Some requirements can be identified from the user point of view either being a subscriber to a PLMN or to a fixed network. These requirements are that a TDS must be able to receive and store documents for a Ttx terminal (subscriber) it is in charge for,
47、 act instead of the terminal as being the terminal itself (negotiation of options), especially there must not be any unacceptable impact on the remote fixed network based Ttx terminal which forces the user of that terminal to change his/her communication habits, to be responsible for the delivery of
48、 the documents to the terminal it is in charge for. A minimum set of functions is necessary to fulfil the requirements. To perform those functions, however, a TDS can be e.g. a separate stand-alone system or part of a Message Handling System MHS (based on X.400- and/or T.300-series of CCITT recommen
49、dations). Once a document has been received and is stored in the document store the way to access and/or retrieve the document is not in the scope of this report. However, it should be noted that usually a Ttx terminal can only make use of the teletex protocols. During the process of receiving documents from another Ttx terminal located in a PLMN or in a fixed network the TDS has to behave like a Ttx terminal anyway (see also 3404583 0078b57 b8b Page 15 GSM 03.44 - version 4.0.0 requirements above). 2. Minimum Set of Functions The fol
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