ETSI GSM 02 01-1999 Digital Cellular Telecommunications System (Phase 2+) Principles of Telecommunication Services Supported by a GSM Public Land Mobile Network (PLMN)《数字蜂窝通信系统(第2+_1.pdf

1、 - STD-ETSI GSM 02.01-ENGL 1444 GSM CHNICAL PECIFICATION GSM 02.01 August 1999 Version 5.5.0 Source: SMG _ Reference: RGTS/SMG-O10201 QR4 ICs: 33.020 Key words: Digital cellular telecommunications system, Global System for Mobile communications (GSM) GLOBAL SYSTEM FOR MOBIIJE COMMUNICATIONS Digital

2、cellular telecommunications system (Phase 2+); Principles of telecommunication services supported by a GSM Public Land Mobile Network (PLMN); (GSM 02.01 version 5.5.0 Release 1996) ETSI European Telecommunications Standards Institute ETSI Secretariat Postal address: F-O6921 Sophia Antipolis CEDEX -

3、FRANCE Office address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE Internet: secretariat O et.si.fr - http:/www.etsi.org Tel.: + 33 4 92 94 42 O0 - Fax: + 33 4 93 65 47 16 Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright an

4、d the foregoing restriction extend to reproduction in all media. O European Telecommunications Standards Institute 1999. All rights reserved. Paae 2 G Terminating Possible - GSMPLMN - GSM 02.01 version 5.5.0 Release 1996: August 1999 A service provision by a network operator (e.g. an Administration

5、or an RPOA) to a subscriber of a GSM PLMN may cover the whole or only part of the means required to fully support the service. The operational and commercial features associated with the provision of the service are included in the service concept. trans it - network The service classification and d

6、escription which follow are independent of different possible arrangements for the ownership and provision to the customer of the means required to support a service. network - TE 1.2 The attribute method of characterization of telecommunication services This characterization is made by using a set

7、of attributes. A telecommunication service attribute is a specific characteristic of that service whole values distinguish it from other telecommunication services. Particular values are assigned to each attribute when a given telecommunication service is described and defined. A list of definitions

8、 of attributes and values used for bearer services and teleservices is contained in, respectively, annex A and annex B. 2 Description of telecommunication services by the attribute method 2.1 General Telecommunication services are described by attributes which define service characteristics as they

9、apply at a given reference point where the customer accesses the service. The description of a telecommunication service by the method of attributes is composed of: - - 2.2 Bearer services and teleservices technical attributes as seen by the customer, and; other attributes associated with the servic

10、e provision, e.g. operational and commercial attributes. Telecommunication services are divided in two broad categories: - bearer services, which are telecommunication services providing the capability of transmission of signals between access points (called user-network interfaces in ISDN); - teles

11、ervices, which are telecornmunication services providing the complete capability, including terminal equipment functions, for communication between users according to protocols established by agreement between network operators. Figure 1 illustrates these definitions. Figure 1 : Bearer services and

12、Teleservices supported by a GSM PLMN NOTE 1: In the majority of cases, at least two networks of different types are involved in the support of a telecommunication service. Figure 1 does not preclude any routing possibility. In order to limit the complexity of the figure, only one transit network is

13、shown. NOTE 2: NOTE 3: Page 15 STD-ETSI GSN OZ-OL-ENGL 1999 3400855 0439473 OB1 Basic Bearer Service GSM 02.01 version 5.5.0 Release 1996: August-1999 The terminating network type may include a GSM PLMN, either the originating one or another one. NOTE 4: Basic Bearer service + Basic Teleservice Basi

14、c Teleservice + supplementary services supplementary service 2.3 Supplementary services 3 TE2 I A supplementary service modifies or supplements a basic telecommunication service. Consequently, it cannot be offered to a customer as a stand alone service. It must be offered together or in association

15、with a basic telecommunication service. The same supplementary service may be applicable to a number of telecommunication services. I TA MT 1 I NOTE: Supplementary services are not currently characterized by the attribute method (see Specification GSM 02.04). 3 2.4 Categorisation of telecommunicatio

16、n services The concepts introduced in this ETS are illustrated in tablel. Table 1 : Categorisation of telecommunication services TE2 TELECOMMUNICATION SERVICES TELESERVICE I BEARER SERVICE . I 3 Customer access to telecommunication services supported by a GSM PLMN 3.1 Reference configuration and acc

17、ess points Considering the reference configuration defined in Specification GSM 04.02, customers can access various telecommunication services at different access points. Figure 2 shows an example of these access points. The reference configuration shows the MS to consist of mobile termination and t

18、erminal equipment. Figure 2 takes into account that service provision by the network operator to a customer accessing a GSM PLMN may cover the whole or part of the means required to fully support the service. I 3 MTO 1-1 TE 1 MT 1 i Figure 2: Example of customer access to services supported by a GSM

19、 PLMN MS: Mobile Station STD-ETSI GSM 02-03-ENCL 1999 E 3400855 0439474 TL8 Page 16 GSM 02.01 version 5.5.0 Release 1996: August 1999 MT: Mobile Termination: supports function specific to management of the radio interface (Um) and adapting information flows at Um to those required by terminal functi

20、ons at access points 1 or 2. For further descriptions of functions and types (e.g. MTO, MT1 and MT2) see GSM 04.02. TE: Terminal Equipment: supports man-machine (access point 3) to the user and may support a physical interface at access point 1 or 2. TE1 : TE presenting an ISDN interface. TE2: TE pr

21、esenting a non-ISDN (e.g. a CCITT V or X series) interface 84,85. TA: ISDN Terminal Adapting functions: may be used to adapt between access points 1 and 2. Um: Radio interface. 3.2 The definition of the access points introduced in Figure 2/GSM 02.01 are as follows: Access points and telecommunicatio

22、n services 1) 2) at access point 1 and 2, bearer services may be accessed; at access point 3 (user to terminal interface), teleservices are accessed - note that the teleservice concept includes the terminal capabilities. 3.3 Terminal equipment It should be noted that a Terminal Equipment (TE) may co

23、nsist of one or more pieces of equipment and may include the following entities: - telephone set; - customer terminals, e.g. Data Terminal Equipments, Teletex terminals; - customer systems. NOTE: The whole mobile station, customer terminals and systems may be privately owned or provided by network o

24、perators. All terminai equipment accessing a GSM PLMN interface at one of the access points defined in section 3.2 must meet the specifications of the protocols at that interface for all the layers that are included in the definition of the telecommunication service used. For some telecommunication

25、services, the service definition also covers some terminai functions and characteristics in addition to those specified by the protocois at the interface. 4 Capabilities to support a telecommunication service 4.1 General The capabilities to fully support a telecommunication service for a customer ac

26、cessing a GSM PLMN include: - - terminai capabilities, when required; - - network capabilities (in the GSM PLMN and in most cases in another network); other service providing capabilities, when required; operational and commercial features associated with the service provision. STDmETSI GSM 02.0L-EN

27、GL 1999 3400855 0439475 954 Page 17 GSM 02.01 version 5.5.0 Release 1996: August1 999 4.2 Network capabilities Network capabilities are described in detail in the GSM 03 series of specifications. Two different levels of GSM PLMN network capabilities are introduced: - - low layer capabilities, which

28、relate to bearer services; high layer capabilities, which together with low layer capabilities relate to teleservices. 4.3 Terminal capabilities Terminal capabilities are also described in terms of low layer and high layer capabilities. In the description of teleservices, the terminal capabilities,

29、both low layer and high layer, are included in the service definition. In the case of bearer service definition, the terminal capabilities are not included but the terminal equipment must conform to the low layer capabilities of the bearer service. 4.4 Operational capabilities The operational capabi

30、lities associated with a service offering may include capabilities for maintenance, charging, user control of service features, etc. The use of such capabilities may involve terminal-network communication and may therefore be viewed as specific applications. 5 Characterization of telecommunication s

31、ervices 5.1 General A telecommunication service supported by a GSM PLMN is characterized and described by service attributes. There are two groups of service attributes applicable to user information flow: - low layer attributes; - high layer attributes. Bearer services are characterized only by low

32、 layer attributes. Teleservices are characterized by both low layer attributes and high layer attributes. The basic characteristics of a telecommunication service are described by the basic service attributes. The additional characteristics associated with a supplementary service which modify or sup

33、plement a basic telecommunication service are described in Specification GCM 02.04. 5.2 Bearer services supported by a GSM PLMN provide the capability for information transfer between a GSM PLMN access point 1 or 2 and an appropriate access point in a terminating network and involve only low layer f

34、unctions (.e. relating to layers 1-3 of the OS1 Reference Model). Bearer services supported by a GSM PLMN The customer may choose any set of high layer (at least 4-7) protocols for his communication, but a GSM PLMN will not ensure compatibility at these high layers between customers. Bearer services

35、 are characterized by a set of low layer attributes in Specification GSM 02.02. These attributes are classified into four categories: - information transfer attributes; - access attributes; - interworking attributes; STD.ETSJ. GSfl 02.0L-ENGL 1777 3400855 0437q7b 870 Page 18 GSM 02.01 version 5.5.0

36、Release 1996: August 1999 - general attributes, including operational and commercial attributes. The bearer capability defines the technical features of a bearer service as they appear to the user at the appropriate access point. For the time being, the bearer capability is characterized by informat

37、ion transfer, access and interworking attributes. A bearer capability is associated with every bearer service. The bearer service provides the user with the possibility of gaining access to various forms of communication, covering for example: - information transfer between a user in a GSM PLMN and

38、a user in a terminating network, including the same GSM PLMN, another GSM PLMN and other types of PLMNs; - information transfer between a user in a GSM PLMN and separate resource providing high layer functions. 5.3 Telesetvices supported by a GSM PLMN Teleservices provide the full capacity for commu

39、nication by means of terminals and network functions and possibly functions provided by dedicated centres. A teleservice supported by a GSM PLMN should use only one (or a small number of) bearer capability recommended by GSM. GSM teleservices are specified in GSM 02.03. Teleservices are characterize

40、d by a set of low layer attributes, a set of high layer attributes and operational and commercial attributes. Low layer attributes are those used to characterize the bearer capability (see subclause 5.2). High layer attributes are used in Specification GSM 02.03 to describe high layer (.e. layer 4-7

41、) information transfer related characteristics. They refer to functions and protocols of layers 4-7 in the CCITT Recommendation X.200 framework which are concerned with the transfer, storage and processing of user messages (provided by a subscribers terminal, a retrieval centre or a network service

42、centre). Therefore, not all attributes can be applied directly at the user to terminal interface (access point 3) as they represent two kinds of features, the bearer capability and the terminal features, that are not directly perceived by the user. A teleservice provides the user with the possibilit

43、y of gaining access to various forms of applications (or teleservice APPLICATIONS) covering for example: - teleservice application involving two terminals providing compatible or identical teleservice attributes at an access point in a GSM PLMN and an access point in a terminating network; teleservi

44、ce application involving a terminal at one access point in a GSM PLMN and a system providing high layer functions (e.g. speech storage system, message handling system) located either within the GSM PLMN or in a terminating network. - 6 Provision of telecommunication services Specifications GSM 02.10

45、 and 02.1 1 define some aspects of the provisions of telecommunication services by a GSM PLMN. The provision of telecommunication services implies: - subscription of basic services and possibly subscription to supplementary services; - - compatibility between terminals; - registration into a service

46、 directory; interworking capabilities (see GSM O9 series of specifications). STDeETSI GSM 02.0L-ENGL 1999 3400855 0439477 727 111 Page 19 GSM 02.01 version 5.5.0 Release 1996: August 1999 The users subscription to a Basic or Supplementary service is normally verified by the network prior to completi

47、on of Call Establishment and/or Supplementary Service operation. This subscription checking shall be performed in accordance with the following sections. 6.1 Subscription checking for Basic Services General Subscription checking is the functionlprocess to ascertaining whether a subscriber has the au

48、thorization to use the particular Basic Service deduced from the call Set-up parameters. It is the responsibility of the HPLMN to transfer, to the VPLMN, only the subscription data corresponding to those services a given subscriber is entitled to use in that VPLMN. For mobile originated calls, subsc

49、ription checking is performed in the VLR, whilst for mobile terminated calls it is performed in either the HLR or the VLR (determined as described below). The prerequisite for executing the subscription check is a successful deduction of a Basic Service from the Compatibility Information contained in the call set up, .e. Bearer Capability Information Element and, in some cases, also the Low Layer and High Layer Compatibility Information elements. For mobile originated calls an MS shall indicate the requested service by appropriate compatibility information elements according