1、- - * 3404583 00778b9 272 J Released: July 1, 1993 GSM 01.02 Version: 4.0.1 Date: June 7, 1993 Work Item No: Key words: European digital cellular telecommunication system (phase 2); General Description of a GSM PLMN ETS I European Telecommunications Standards Institute ETSI Secretariat: Route des Lu
2、cioles, F-O6921 Sophia Antipolis Cedex . France TF. + 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 + 33 93 65 47 16 Tx. 47 O0 40 F This is an unpublished work the copyright in which vests in the European Telecommunications Stanards Institute. All rights reserved. The inforrnaiiori contained herein is the property cf ETSI and
3、 no part mq be rsprcdrced cr sed except as authorised by contract or other written permission. The copyright and the foregoing restriction on reproduction and use extend to ail media in which the information may be embodied. M 3404583 0077870 T94 1 Page 3 GSM 01.02 . version 4.0.1 : June 1993 CONTEN
4、TS INTRODUCTION 5 1.1 SCOPE . 5 2 GENERAL 5 3 SERVICES . 6 4 SYSTEM ARCHITECTURE. ENTITIES AND FUNCTIONS 7 4.1 The Mobile Station (MS) 7 4.2 The Base Station System (BSS) 8 4.3 The Mobile Service Switching Centre (MSC) 8 4.4 The Home Location Register (HLR) . 8 4.5. 4.6. 4.7. The Visitor Location Re
5、gister (VLR) 9 Operation and Maintenance Centre (OMC) 9 System Architecture, Interworking and Interfaces . 9 5 SUBSYSTEMS OF A GSM PLMN . IO 5.1 5.2 5.3. The Base Station System . 10 The Switching and Management Subsystems (SMSS) 11 Operation and Maintenance Subsystem . 12 6 OTHER ASPECTS . 13 6.1 S
6、ignalling . 13 6.2 Transmission Plan 13 6.3 Technical Description of Services and Facilities 14 6.4 Coding Aspects and Information Processing . 14 6.5 Interworking . 14 Previous page is blank . 3404583 0077871 920 Page 5 GSM 01.02 - verslon 4.0.1 : June 1993 I 1 INTRODUCTION 1.1 SCOPE The present do
7、cument gives a general description of a GSM Public Land Mobile Network (PLMN). It contains a definition and a summarised description of the elements comprised in the network, and their functions and the associated performance objectives. The services and facilities that the network can offer to its
8、users, are also described as well as the general lines of signalling procedures, operation and maintenance. Since the present document includes information spread throughout all GSM specifications this document can serve as guide. The terms “GSM MOU“ and “PCN MOU“ (or sometimes “MOU“ only) used in t
9、his document refers to Operators organisations implementing GSM and to which some responsibility of referred-to documents belong. 2 GENERAL The general objectives of a GSM PLMN network are: - regarding aspects of service to users: to give users a wide range of services and facilities, both voice and
10、 non voice, that are compatible with those offered by fixed networks (PSTN, ISDN and PDNs) through standardized access to these networks. give certain services and facilities exclusive to mobile situations. give compatibility of access to the GSM network to any mobile subscriber in any country of th
11、e CEPT who operates the GSM system. give facilities for automatic roaming, locating and updating mobile subscribers. give subscribers a service with a good quality level. give service to a wide range of mobile stations, including vehicle mounted stations, portable stations and handheld stations. - r
12、egarding performance aspects: give high efficiency from the radioelectrical spectrum. allow an attractive economic cost in terms of both infrastructure and mobile equipment. The vocabulary used in the GSM Specifications is detailed in GSM 01.04. Previous page is blank 3404583 O077872 867 Page 6 GSM
13、01.02 - version 4.0.1 : June 1993 3 SERVICES I A GSM PLMN provides the user with a wide range of services and facilities that, aside from some that are specific to mobile situations, make use of access to other existing networks (fixed telephone networks, data networks and Integrated Services Digita
14、l Network). The characteristics of the telecommunications services offered (that are charactericed by a series of attributes and values), the network capacities required for them, and the modelling method used, are described in GSM 02.01. A telecommunication service supported by the GSM PLMN is defi
15、ned as a group of communication capabilities that the Operator of the network places at the disposal of its users. The introduction phases of the various services are described in the relevant GSM/PCN MOU documents. The Telecommunication Services provided by the GSM PLMN are called Basic Services: m
16、ded into two main groups, - Bearer Services, which are Telecommunication Services that give the user the capacity needed to transmit appropriate signals between certain access points (user-network interfaces). - Teleservices, which are Telecommunication Services that provide the user with necessary
17、capacities including terminal equipment functions, to communicate with any other users. Supplementing and/or modifying the Basic Services (Bearer Services and Teleservices), the Supplementary Services complete the offer to the user. Bearer Services are described in GSM 02.02, Teleservices in GSM 02.
18、03, and Supplementary Services in GSM 02.04 and the GSM 02.80 series. An overview of the Basic services is given in Tables 1 and 2. Possibilities for alternate and/or simultaneous use of telecommunications services are covered by GSM 02.05 (refer to GSM/PCN MOU). Those aspects related to security re
19、quired due to the use of the radio channel used for the system, are described in GSM 02.09. The implementation of these elements in the system, and their implications for the network, are found in GSM 03.20. The specification for the services supported by the system also includes aspects related to
20、the quality of Service (QOS). Report GSM 02.08, covers the contribution of the PLMN on the Quality of Service parameters. Since this is a network which uses a radio interface, the procedures through which the subscribers have access to the services offered are standardised. GSM 02.11 covers these as
21、pects from the point of view of the subscriber. Technical aspects related to access to services (register, handover, roaming, etc.) appear in the GSM 03-Series of Recs. The Pan-European concept of the system makes standardization of accounting mechanisms absoluteiy essential. Aspects related to bill
22、ing information, transferred account and international accounting are covered in the relevant GSMIPCN MOU documents. Aspects related to the supplementary service, Advice of Charge are covered in GSM 02.24. All the services and facilities offered by the GSM system require the support of certain netwo
23、rk capabilities. The network features related to call progress information are described in GSM 02.40. E 3404583 0077873 7T3 Page 7 GSM 01.02 - version 4.0.1 : June 1993 To facilitate simplicity of use by the subscriber, it is vitally important to have appropriate man- machine interfaces. GSM 02.30
24、specifies requirements and gives guidelines for the man-machine interface for calls. The Pan-European nature of the system offers the subscriber the possibility of moving freely through countries where a GSM PLMN is operated. To guarantee access to services offered to subscribers, agreements are nee
25、ded between the various Network Operators. The licensing aspects of individual system subscriber are covered in GSM 02.12 (refer to GSM MOU), while aspects regarding subscriptions to services offered by the system are included in GSM 02.13 (refer to GSM MOU). The capabilities for Operator Determined
26、 Barring of Calls is defined in GSM 02.41. The Subscribers Directory that should be offered by PLMN Operators and the general principles governing the free circulation of mobile stations, are found in GSM 02.14 and GSM 02.15 respectively (refer to GSM MOU). 4 SYSTEM ARCHITECTURE, ENTITIES AND FUNCTI
27、ONS In order for the system to support the services and facilities described in the previous chapter, a series of functions are required. The description of the network functions, procedures and the interworking between PLMNs, are covered in GSM 03.01. Those network functions that specifically cover
28、 aspects of network security are found in GSM 03.20. Various generic aspects found in any telecommunication network, especially a GSM PLMN, such as: numbering, identification and routing; signalling required to route calls from a fixed network to a mobile subscriber; technical performance objectives
29、 that the fixed part of the GSM network must comply with, are found respectively in GSM 03.03, GSM 03.04, GSM 03.05 and GSM 03.70. The functions referred to in previous paragraphs of this chapter, are grouped into fmctional entities. The complete system, in turn, is formed by a number of these funct
30、ional entities. Figure 1 shows the functional entities of the system and their logical interconnections. 03.02 covers formal definitions of these entities and aspects related to the same. 4.1 The Mobile Station (MS) The mobile station (MS) consists of the physical equipment used by the subscriber :v
31、 a GSM PLMN to gain access to the telecommunications services offered. Functionally it includes a Mobile Termination (MT) and, depending on the services it can support, various Terminal Equiprent (TE), and combinations of Terminal Equipment (TE) and Terminal Adaptor (TA) func!icns. The configuration
32、s are described in GSM 04.02. There are various types of MS, described in GSM 02.06, such as: vehicle mounted s!ations, portable stations or handheld stations. The specific aspect of the man-machine in!erace are covered in GSM 02.30. The features that the MS may contain are described in GSM 02.07. A
33、 mobile station has a number of identities. First as all equipment. it has an Internii!cri Llobile Equipment Identity (IMEI) which is described in GSM 02.16 and GSM 03.03. When -d by a subscriber, it carries the International Mobile Subscriber Identity (IMSI) - described in :.i 03.03 - which is embo
34、died in the subscriber Identity Module (SIM) described in GSM 02.17 Page 8 GSM 01.02 - version 4.0.1 : June 1993 4.2 The Base Station System (BSS) The Base Station System (BSS) is the physical equipment used to give radio coverage to a determined geographical zone called a cell, and to contain the e
35、quipment needed to communicate with MS. Functionally, a BSS is subdivided in turn into a control function carried out by the base station controller (BSC) and a radio transmitting function carried out by the base transmitter station (BTS). The specification for the equipment forming the BSS is found
36、 in GSM 11.20. In GSM 08 series of Recs are found the definitions and specifications for the interfaces between the various components of the BSS. 4.3 The Mobile Servlce Switching Centre (MSC) The Mobile Service Switching Centre (MSC) is a switching centre that holds all the switching functions need
37、ed for mobiles located in an associated geographical area, called an MSC area. A Mobile Service Switching Centre takes into account the mobile nature of its subscribers and manages the necessary radio resources, especially those procedures required to handle and update the location registration proc
38、edure described in GSM 03.12 and procedures required to carry out the handover described in GSM 03.09. Interworking with other networks (PSTN for example) needs the presence of specific functions associated with the MSC; known as interworking functions (IWF). The IWFs depend on the type of network w
39、ith which it is desired to interconnect and the type of service desired. Interworking functions are described in GSM 09.04, GSM 09.05 GSM 09.06 and GSM 09.07, with the corresponding interworking signalling with PSTN-ISDN found in GSM 09.09. The MSC specification is found in GSM 11.30. 4.4 The Home L
40、ocatlon Register (HLR) The Home Location Register (HLR) is a data base used for the management of mobile subscribers. The number of them in a PLMN varies according to the characteristics of the PLMN itself. Two types of basic information are stored in the HLR: - Subscriber information - part of the
41、mobile location information allowing incoming calls to be routed to the MSC for the said mobile. The organisation of subscriber data appears in GSM 03.08. Any administrative action by the Network Operator on subscriber data is carried out in the hLA. The Home Location Register stores three identitie
42、s essential to the system: - - - The International Mobile subscriber Identity (IMSI) (described in GSM 03.03). The Mobile station ISDN Number The VLR address (see following section: VLR). The specifications for the HLR are covered in GSM 11.31. 3404583 0077875 576 * Page 9 GSM 01.02 - version 4.0.1
43、: June 1993 4.5. The Vlsltor Location Register (MR) The VLR is the functional unit that dynamically stores subscriber information, such as location area, when the subscriber is located in the area this VLR is in charge of. When a roaming mobile enters an MSC area, this MSC warns the associated VLR o
44、f this situation: the mobile enters a registration procedure through which it is assigned a mobile subscriber roaming number (MSRN) or visited network address that serves to route incoming calls to that mobile. The VLR also contains other information needed to handle incomingoutgoing calls. This inf
45、ormation is gathered by the VLR via a dialogue with the HLR associated with the mobile subscriber. - Mobile Station Roaming Number. - Temporary Mobile Subscriber Identity, if applicable - The location area in which the mobile has been registered. - Data related to supplementary service parameters. T
46、he description of the procedure for the exchange of information between VLR and HLR appears in GSM 03.12. 4.6. Operation and Maintenance Centre (OMC) The Operation and Maintenance Centre is the functional entity through which the Network Operator can monitor and control the system. A general descrip
47、tion of the structure and objectives of the maintenance network associated with a PLMN are found in GSM 12.00 and 12.01. The rest of the operation and maintenance functions for the various interfaces and entities making up the system are described in the rest of the GSM 12 series. 4.7. System Archit
48、ecture, Interworking and Interfaces Some of the network architectures that can be obtained with the functional elements described above are shown in GSM 03.02. The figure 1 show these entities and their interconnection. To achieve optimum working between different units forming the system, the corre
49、sponding interfaces are required. The use of the signalling system No7 (557) in particular between MSC- VLR and MSC-HLR, allows the possibility of transmitting both call control signals and other information. The corresponding transmission capabilities must be supported by the Mobile Application Part (MAP) defined in GSM 09.02. A general description of the different interfaces needed in a GSM PLMN appears in GSM 03.02. The interface is defined in the GSM 04 series of specifications, relative to layers 1, 2 and 3, while the 05 series of specifications cover jointly the specific tran
