1、 STD-ETSI GSM 03.07-ENGL L77b 3400855 0159088 TLB I GSM - s,“ N I CAL PECI FICATION GSM 03.07 November 1996 Version 5.0.0 Source: ETSI TC-SMG Reference: TS/SMG-O30307Q ICs: 33.020 Key words: Digital cellular telecommunications system, Global System for Mobile communications (GSM) GLOBAL SYSTEM FOR M
2、OBILE COMMUNICATIONS Digital cellular telecommunications system; Restoration procedures (GSM 03.07) ETSI European Telecommunications Standards Institute ETSI Secretariat Postal address: F-O6921 Sophia Antipolis CEDEX - FRANCE Office address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRA
3、NCE X.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: secretariat etsi.fr 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 and the foregoing restriction extend to reproduction in all med
4、ia. O European Telecommunications Standards Institute 1996. All rights reserved. STD-ETSI GSM 03-07-ENGL L77b W 3400855 0357087 75q W Page 2 GSM 03.07 version 5.0.0: November 1996 Whilst every care has been taken in the preparation and publication of this document, errors in content, typographical o
5、r otherwise, may occur. If you have comments concerning its accuracy, please write to “ETSI Editing and Committee Support Dept.“ at the address shown on the title page. Page 3 GSM 03.07 version 5.0.0: November 1996 Contents Scope 7 1.1 Normative references 7 1.2 Abbreviations . 8 Design objectives 8
6、 Restoration indicators in location registers 8 3.1 Restoration Indicators in the VLR 8 3.2 Restoration Indicators in the HLR 9 Restoration of data in the VLR 9 4.1 Restart of the VLR . 9 4.2 Restoration Procedures . 9 4.2.1 Incoming Call . 10 4.2.2 Mobile Terminated Short Message . 11 4.2.3 Outgoin
7、g MS request 12 4.2.4 Location Updating or IMSI Attach 12 4.2.5 Use of TMSI 12 Restoration of data in the HLR 13 5.1 5.2 Restart of the HLR . 13 Procedures During Restoration . 13 5.2.1 Mobile terminated call . 13 5.2.2 Mobile Originated Activity 14 Periodic location updating . 14 Stand-alone operat
8、ion of the VLR . 14 Foreword . 5 History 15 STD.ETSI GSM 03.07-ENGL L77b 3LiOO855 0357073 502 W Page 4 GSM 03.07 version 5.0.0: November 1996 Blank page STD-ETSI GSM 03.07-ENGL L77b 3Li00855 0157072 YY7 Page 5 GSM 03.07 version 5.0.0: November 1996 Foreword This Global System for Mobile communicatio
9、ns Technical Specification (GTS) has been produced by the Special Mobile Group (SMG) Technical Committee (TC) of the European Telecommunications Standards Institute (ETSI). This GTS defines the restoration procedure within the digital cellular telecommunications system. The contents of this GTS are
10、subject to continuing work within TC-SMG and may change following formal TC-SMG approval. Should TC-SMG modify the contents of this GTS it will then be republished by ETSI with an identifying change of release date and an increase in version number as follows: Version 5.x.y where: y the third digit
11、is incremented when editorial only changes have been incorporated in the specif ication; x the second digit is incremented for all other types of changes, .e. technical enhancements, corrections, updates, etc. STD-ETSI GSM 03-07-ENGL 399b 3400855 0357093 385 Page 6 GSM 03.07 version 5.0.0: November
12、1996 Blank page STD-ETSI GSM 03-07-ENGL L77b 3q00855 0159094 211 Page 7 GSM 03.07 version 5.0.0: November 1996 1 Scope The data stored in location registers are automatically updated in normal operation; the main information stored in a location register defines the location of each mobile station a
13、nd the subscriber data required to handle traffic for each mobile subscriber. The loss or corruption of these data will seriously degrade the service offered to mobile subscribers; it is therefore necessary to define procedures to iimit the effects of failure of a location register, and to restore t
14、he location register data automatically. This Global System for Mobile communications Technical Specification (GTS) defines the necessary procedures. The basic principle is that restoration should be based on radio contact to avoid faulty data being spread in the system. Subscriber data for suppleme
15、ntary services must also be correctly restored, although the impact on service of corruption of supplementary service data is less severe. Procedures for supporting these functions are defined in GSM 09.02. The MAP operation “IMSI Attach“ is used only in MAP version 1; in MAP version 2 the same func
16、tion is performed by the MAP operation “Update Location Area“. References in this specification to IMSI attach apply only to MAP version 1 network entities. If the restoration of subscriber data in the VLR is triggered by Location Updating or IMSI Attach, the VLR retrieves subscriber data from the H
17、LR by sending an “Update Location“ request, which triggers one or more “Insert Subscriber Data“ operations from the HLR. The “Update Location“ request may also be used to send the LMSI to the HLR. If the restoration of subscriber data in the VLR is triggered by a “Provide Roaming Number“ request, th
18、e behaviour of the VLR depends on whether it is implemented according to MAP version 1 or MAP version2. For MAP version 2, the VLR retrieves subscriber data from the HLR by sending a “Restore Data“ request, which triggers one or more “Insert Subscriber Data“ operations from the HLR. The “Restore Dat
19、a“ request is also used to send the LMSI to the HLR. For MAP version 1, the VLR retrieves subscriber data from the HLR by sending a “Send Parameters“ request with parameter type “Subscriber Data“, which cannot be used to send the LMSI to the HLR. The VLR number and MSC number in the subscriber data
20、in the HLR are updated by the “Update Location“ procedure. 1.1 Normative references This GTS 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 date
21、d references, subsequent amendments to or revisions of any of these publications apply to this GTS only when incorporated in it by amendment or revision. For undated references, the latest edition of the publication referred to applies. 131 141 151 GSM O1 .O4 (ETR 350): “Digital cellular telecommuni
22、cations system (Phase 2+); Abbreviations and acronyms“. GSM 03.05 (ETR 351): “Digital cellular telecommunications system Technical performance objectives“. GSM 03.22 (ETS 300 930): “Digital cellular telecommunications system; Functions related to Mobile Station (MS) in idle mode and group receive mo
23、de“. GSM 03.40 (ETS 300 901): “Digital cellular telecommunications system (Phase 2+); Technical realization of the Short Message Service (SMS) Point-to-Point (PP)“. GSM 09.02 (ETS 300 974): “Digital cellular telecommunications system (Phase 2+); Mobile Application Part (MAP) specification“. I STDgET
24、SI GSM U3-07-ENGL 179b 3401855 0157095 Page 8 GSM 03.07 version 5.0.0: November 1996 Pl GSM 12.07 (ETS 300 61 2-3): “Digital cellular telecommunications (Phase 2); Operations and performance management“. 1.2 Abbreviations Abbreviations used in this GTS are listed in GSM 01.04. 2 Design objectives 15
25、8 m system To avoid loss of all the data stored in a location register when part of the equipment of the location register fails, a regime must be implemented to secure the data. This regime can include replication of volatile storage units and periodic back-up of data to non-volatile storage. If th
26、e data security regime ensures the integrity of the data in spite of failure of part of the location register equipment then there will be no impact on service. This Technical Specification describes the procedures to be used when the integrity of data in the location register cannot be ensured; tha
27、t situation is referred to below as “failure“. The VLR shall erase all IMSI records affected by the failure when it restarts after a failure. For the HLR, periodic back-up of data to non-volatile storage is mandatory. The reliability objectives of location registration are listed in GSM 03.05 and GS
28、M 12.07. 3 Restoration indicators in location registers 3.1 Restoration Indicators in the VLR Three restoration indicators are provided in the VLR for each IMSI record: “Confirmed by Radio Contact“, “Subscriber Data Confirmed by HLR“ and “Location Information Confirmed in HLR“. The indicator “Confir
29、med by Radio Contact“ indicates whether the VLRs record of location area identity and MSC number for the mobile station is confirmed by radio contact. The indicator “Confirmed by Radio Contact“ in an IMSI record is set to the initial value “Not Confirmed“ when the VLR receives a “Provide Roaming Num
30、ber“ request, an “Update Location Area“ request or an “IMSI Attach“ request for an MS for which the VLR does not have an IMSI record. The indicator “confirmed by Radio Contact“ is set to “Confirmed“ when the radio contact that has been established with the MS is authenticated. The indicator “Subscri
31、ber Data Confirmed by HLR“ indicates whether the subscriber data set for the mobile station held by the VLR is consistent with that held by the HLR. The indicator “Subscriber Data Confirmed by HLR“ is set to the initial value “Not Confirmed“ when the VLR receives a “Provide Roaming Number“ request,
32、an “Update Location Area“ request or an “IMSI Attach“ request for an MS for which the VLR does not have an IMSI record. The indicator “Subscriber Data Confirmed by HLR“ is set to “Confirmed“ at either of the following events: - - The indicator “Location Information Confirmed in HLR“ indicates whethe
33、r the HLRs record of VLR number and MSC number for the mobile station is confirmed by radio contact. The VLR successfully performs an “Update Location“ to the HLR; The VLR successfully performs a “Restore Data“ operation to the HLR. The indicator “Location Information Confirmed in HLR“ is set to “No
34、t Confirmed“ at any of the following events: - The VLR receives an “Update Location Area request or an IMSI Attach“ request for an MS for which the VLR has no IMSI record; - A VLR which serves two or more MSCs receives a “Provide Roaming Number“ request for an MS for which the VLR has no IMSI record
35、; STD-ETSI GSM 03-07-ENGL L77b 3400855 015707b 07q Page 9 GSM 03.07 version 5.0.0: November 1996 - The indicator “Location Information Confirmed in HLR“ is set to “Confirmed“ at either of the following events: The VLR receives a “Reset“ message from the HLR with which the MS is registered. - A VLR w
36、hich serves only one MSC receives a “Provide Roaming Number“ request for an MS for which the VLR has no IMSI record; - Successful completion of the “Update Location“ procedure triggered by authenticated radio contact. 3.2 Restoration Indicators in the HLR As an implementation option, one restoration
37、 indicator may be provided in the HLR for each IMSI record: “Check SS“. The “Check SS“ indicator is set to “Check Required“ when the HLR restarts after a failure. The “Check SS“ indicator is checked whenever the HLR receives an “Update Location“ request from a VLR. If it is set to “Check Required“,
38、after successful completion of subscriber data retrieval that ran embedded in the “Update Location“ procedure the HLR sends a “Forward Check SS Indication“ request message to the VLR and sets the “Check SS“ indicator to “Check Not Required“. 4 Restoration of data in the VLR The effect on service of
39、failure of a VLR is different from the effect of failure of an HLR. The procedures for restoration of a VLR and an HLR are therefore different. 4.1 Restart of the VLR When a VLR restarts after a failure, all IMSI records affected by the failure are erased. There will be no subscriber data or locatio
40、n information stored for an affected mobile station until after the VLR has received either a “Provide Roaming Number“ request or an “Update location Area“ request for that mobile station. The VLR causes all affected TMSls and all affected LMSIs to become invalid. “Invalid“ in this context means tha
41、t the TMSI and LMSI can no longer be regarded as accurate. The term is used to avoid unnecessary constraints on the implementation. On receipt of either a “Provide Roaming Number“ request or an “Update Location Area“ request, restoration of subscriber data in the VLR is triggered individually for ea
42、ch IMSI record as described below. 4.2 Restoration Procedures The objective of the restoration procedure is to handle all traffic for each mobile subscriber correctly. In order to meet this objective, the procedure must make the subscriber data in the VLR consistent with that in the HLR, and make th
43、e location information in the HLR and VLR reflect accurately the current location of the MS. - STD.ETS1 GSM 03-07-ENGL L97b m 3q00855 0359097 TZ0 Page 10 GSM 03.07 version 5.0.0: November 1996 4.2.1 Incoming Call a) Send Routing Information(GMSC-HLR) The HLR sends “Provide Roaming Number“ to the VLR
44、 as for normal operation. The LMSI is updated by the VLR when the VLR requests the transfer of subscriber data from the HLR using the “Restore Data“ operation. b) Provide Roaming Number (HLR-VLR) - Regardless of whether the VLR has an IMSI record corresponding to the IMSI in the “Provide Roaming Num
45、ber“, it returns an MSRN. If no IMSI record exists, the VLR creates a skeleton IMSI record, sets the indicators “Subscriber Data Confirmed by Radio Contact“ and “Confirmed by HLR“ to “Not Confirmed“ and (if IMSI Attach is used) marks the IMSI as attached. If the VLR serves two or more MSCs, the VLR
46、sets the indicator “Location Information Confirmed in HLR“ to “Not Confirmed“. Otherwise, if the VLR serves only one MSC, the indicator “Location Information Confirmed in HLR“ is set to the initial value “Confirmed“ . - If the indicator “Subscriber Data Confirmed by HLR“ is “Not Confirmed“ the VLR r
47、equests authentication data, if required and still not available and subscriber data from the HLR. When the dialogue that covers the subscriber data retrieval procedure is completed successfully, the VLR sets the indicator “Subscriber Data Confirmed by HLR“ to “Confirmed“. The indicators “Confirmed
48、by Radio Contact“ and “Location Information Confirmed in HLR“ remain unchanged. - If the IMSI record for the MS is marked “Subscriber Data Confirmed by HLR“ but “Not Confirmed by Radio Contact“ the operator may choose an appropriate method to limit the number of “Search for MS“ procedures for that M
49、S. c) Send Information for I/C Call Setup (MSC-VLR) - If the VLR has no IMSI record, or if the record is marked “Subscriber Data Not Confirmed by HLR“ the VLR returns a “System Failure“ error. If the VLR has an IMSI record marked “Subscriber Data Confirmed by HLR“ and “Not Confirmed by Radio Contact“, the VLR handles the request in the normal way, except that the “Search for MS“ procedure is used instead of the “Page MS“ procedure. - - If the VLR has an IMSI record marked “Subscriber Data Confirmed by HLR“ and “Confirmed by Radio Contact“, the VLR handles the r
