1、STD-ETSI GSM 03-85-ENGL L77b W 3Li00855 0252777 L7B W - GSM - SECHNiCAL PECIFICATION GSM 03.85 December 1996 Version 5.0.0 Source: ETSI TC-SMG Reference: TS/SMG-O30385Q ICs: 33.020 Key words: Digital cellular telecommunications system, Global System for Mobile communications (GSM) GLOBAL SYSTEM FOR
2、MOBJLE COMkfNICATIONS Digital cellular telecommunications system; Closed User Group (CUG) supplementary services - Stage 2 (GSM 03.85) ETSI European Telecommunications Standards Institute ETSI Secretariat Postal address: F-O6921 Sophia Antipolis CEDEX - FRANCE Office address: 650 Route des Lucioles
3、- Sophia Antipolis - Valbonne - FRANCE X.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: secretariat Q 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 restrict
4、ion extend to reproduction in ail media. Q European Telecommunications Standards institute 1996. All rights reserved. STD-ETSI GSV 03.85-ENGL L77b 3400855 0352778 004 Page 2 GSM 03.85 version 5.0.0: December 1996 Whilst every care has been taken in the preparation and publication of this document, e
5、rrors in content, typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to “ETSI Editing and Committee Suppori Dept.“ at the address shown on the title page. STD-ETSI GSM 03-85-ENGL L77b 3Li00855 0352777 TYO Page 3 GSM 03.85 version 5.0.0: December 1996 Co
6、ntents Foreword . 5 O Scope . 7 o . 1 Normative references . 7 0.2 Definitions . 7 0.3 Abbreviations 8 1 Closed user group (CUG) . 9 1.1 Handling of Closed User Group . 9 1.1.1 Mobile Originated (MO) CUG call handling 9 1.1.1.1 MO CUG call handling at the MSC . 9 1.1 . 1 . 2 MO CUG call handling at
7、the VLR 9 Mobile Terminated (MT) CUG call handling . 10 1.1.2.1 1.1.2.2 1.1.2.3 MT CUG handling functions at the MSC 10 1.1.2.4 MT CUG handling functions at the VLR . 10 CUG subscriber roaming requirements . 11 1.1.4.1 Non-CUG GSM PLMNs . 11 1.1.4.2 Interworking to Non-CUG networks 12 Supplementary
8、service interactions 12 1.1.5.1 Interaction with Call Forwarding . 12 1.1.5.2 Interaction with call waiting 12 Functions and information flows 13 1.2.1 Functions . 13 1.2.2 Information flows 15 13 Information stored in the HLR . 21 1.4 Information stored in the VLR . 21 1.5 Handover 22 1.6 Cross pha
9、se compatibility 22 MSC, VLR only support phase 1 22 GMSC only supports phase 1 22 1.1.2 MT CUG handling at the GMSC . 10 MT CUG handling functions at the HLR . 10 1.1.3 1.1.4 CUG interworking requirements . 11 1.1.5 1.2 1.6.1 1.6.2 History . 23 STD-ETSI GSM 03.85-ENGL 3776 W 3q00855 0352780 7b2 Pag
10、e 4 GSM 03.85 version 5.0.0: December 1996 Blank page STD.ETS1 GSM 03-85-ENGL 177b 3400855 0152781 bT9 Page 5 GSM 03.85 version 5.0.0: December 1996 Foreword This Global System for Mobile communications Technical Specification (GTS) has been produced by the Special Mobile Group (SMG) Technical Commi
11、ttee (TC) of the European Telecommunications Standards Institute (ETSI). This GTS defines the stage 2 of the Closed User Group (CUG) supplementary services within the digital cellular telecommunications system. The contents of this GTS are subject to continuing work within TC-SMG and may change foll
12、owing 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 is incremented when editorial only changes have been incorpo
13、rated in the cpecif ication; x the second digit is incremented for all other types of changes, .e. technical enhancements, corrections, updates, etc. The specification from which this GTS has been derived was originally based on CEPT documentation, hence the presentation of this GTS may not be entir
14、ely in accordance with the ETSVPNE rules. STDBETSI GSM 03.85-ENGL 197b 3400855 0152782 535 Page 6 GSM 03.85 version 5.0.0 December 1996 Blank page STD-ETSI GSM 03.85-ENGL L77b 34130855 0252783 471 Page 7 GSM 03.85 version 5.0.0: December 1996 O Scope This Global System for Mobile communications Tech
15、nical Specification (GTS) gives the stage 2 description of the closed user group supplementary service. The community of interest supplementary service defined is: - closed user group (CUG) (see clause 1). 0.1 Normative references This GTS incorporates by dated and undated reference, provisions from
16、 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 these publications apply to this GTS only when incorporated in it by amendment or revision.
17、 For undated references, the latest edition of the publication referred to applies. GSM O1 .O4 (ETR 350): “Digital cellular telecommunications system (Phase 2+); Abbreviations and acronyms“. GSM 02.85: “Digital cellular telecommunications system; Closed User Group (CUG) Supplementary Services - Stag
18、e 1 I. 0.2 Definitions CUG terminology defined in GSM 02.85 is applicable to this GTS. In addition, the following definitions apply: CUG Authorization Functions: Checks performed by the network to ensure that the integrity of a CUG related call is guarantied. CUG calls are rejected if they do not me
19、et the criteria of these checks. CUG call: A CUG call, in signalling terms, is a call where CUG information is passed from the originating switching entity to the destination entity. CUG Index: A code used to select a CUG for an outgoing call, or to indicate an incoming CUG call. Indices are passed
20、between the user and the network and have significance only within the context of a users subscription. CUG Interlock Code: A code which uniquely identifies a CUG within a network. The Interlock code is passed from the point of origin to the destination in a CUG call to identify the CUG which has be
21、en invoked. CUG Related Call Barring: CUG related call barring is call barring applied to a CUG subscriber by the home network when roaming in a non-CUG network. The user is unable to remove CUG related call barring. Explicit CUG Invocation: Explicit CUG invocation is where a calling user attempts t
22、o invoke a CUG by passing CUG information to the network in a call request. Implicit CUG Invocation: Implicit CUG invocation is where the user invokes some default characteristic of a CUG without providing any CUG information in the call request. Normal Call: A normal call in the context of this CUG
23、 GTS is a call established from a CUG subscriber where no CUG information is passed from the originating switching entity to the destination entity. Outgoing Access Indicator: An indication passed from the point of origin to the destination in a CUG call to indicate that the calling user has subscri
24、bed to the Outgoing Access inter-CUG accessibility subscription option. STD-ETSI GSM 03-85-ENGL 177b O 340c1855 0152784 308 O Page 8 GSM 03.85 version 5.0.0: December 1996 0.3 Abbreviations For the purpose of this GTS, the following abbreviations apply, in addition to those listed in GSM 01.04: BS C
25、I CUG IA IC IC (pref) IC+OA ICB OA OCB Pref CUG SOA SPC Basic Service CUG Index Closed User Group Incoming Access Interlock Code Interlock code of the preferential CUG interlock Code and Outgoing Access indicator. Incoming Calls Barred within the CUG Outgoing Access Outgoing Calls Barred within the
26、CUG Preferential CUG Suppress OA Suppress Preferential CUG STD.ETS1 GSM 03-85-ENGL L99b m 3400855 0352785 244 Page 9 GSM 03.85 version 5.0.0: December 1996 1 Closed user group (CUG) The responsibilities of GSM network nodes with respect to CUG are described in the CUG handling clause. The Functions
27、subclause 1.2.1 describes the CUG service logic and how CUG information is used. The flow of CUG information in various call cases is shown in the Information Flows subclause 1.2.2. 1 .I Handling of Closed User Group A GSM PLMN supporting the CUG supplementary service must guarantee the integrity of
28、 any CUG which it handles. It is not however mandatory for a PLMN to support the CUG supplementary service. A CUG is uniquely identified within a network by a CUG Interlock Code. The Interlock Code is transferred between terrestrial network entities to indicate a CUG call. A user identifies a CUG by
29、 a CUG Index A CUG Index is used to select or indicate the use of a specific CUG in relation to a call. The index is locally transferred between the mobile station and serving VLR and only has significance within the context of an individual subscription. 1.1 .I Mobile Originated (MO) CUG call handl
30、ing A CUG subscriber may invoke a CUG by providing the network with a CUG Index at call establishment. This is termed Explicit CUG invocation. Alternatively, if the subscription allows, some default characteristic of a CUG may be invoked automatically if no CUG information is provided. This is terme
31、d Implicit CUG invocation. The network may optionally indicate the use of an implicitly invoked CUG to the calling user. A CUG subscriber may suppress certain CUG attributes by providing suppression indicators during call Set-up. The provision of such suppression indicators results in explicit CUG i
32、nvocation. Any nonCUG related Call Barring supplementary service requirements shall be discharged before CUG authorization occurs. 1 .I .1.1 MO CUG call handling at the MSC The MSC shall pass any user provided CUG information to the VLR at call establishment. If an Interlock Code, or Interlock code
33、with Outgoing Access indicator, is received from the VLR the MSC shall establish a CUG call with the destination network using this information. If a CUG Index is received from the VLR the MSC shall pass this to the calling MS. If the CUG call authorization is unsuccessful the MSC shall pass an indi
34、cation to the mobile station. 1.1.1.2 MO CUG call handling at the VLR Authorization of a MO CUG call is performed by the serving VLR. Authorization is determined by the information provided by the user, the subscription information stored in the VLR and the MO CUG call authorization function, see Fu
35、nctions clause. Successful authorization may result in a normal MO call (call without CUG information transferred to the called party) or a MO CUG call (call with CUG information transferred to the called party). When a CUG call is to be made the VLR passes CUG information to the MSC to be used in t
36、he call establishment. Note, the VLR may optionally pass a CUG Index to the MSC (to be passed to the calling user) to indicate that a ClJG has been implicitly invoked. This parameter is not passed to the call destination. In the case of a normal call, no CUG information is passed to the MSC and the
37、call is established normally. On authorization failure the VLR shall reject the call providing a suitable indication to the serving MSC which is passed to the calling party. STD.ETSI GSM 03-85-ENGL L79b 3400855 015278b 180 Page 10 GSM 03.85 version 5.0.0: December 1996 1.1.2 Mobile Terminated (MT) C
38、UG call handling The terminating network is responsible for enforcing the integrity of a CG related call. The terminating network must therefore ensure that the calling party attributes and the called party subscription meet CUG restrictions. The terminating network provides the called user with an
39、indication of an incoming CUG call. Non-CUG related Call Barring supplementary service requirements are discharged before CG authorizations. Call forwarding requirements are discharged after CUG authorizations. 1.1.2.1 MT CUG handling at the GMSC The GMSC shall pass any CG information contained in a
40、n incoming call establishment message to the HLR in the routing enquiry. The GMSC shall continue the call establishment using the CG information received from the HLR rather than that which was initially received. Note, in rare circumstances the HLR may discard CUG parameters, see the Call Forwardin
41、g interaction. If a CUG call fails the GMSC shall return an indication to the originating network. 1.1.2.2 MT CUG handling functions at the HLR Authorization of a MT CG call is performed at the called parties HLR. Authorization is determined by the information received in the call establishment sign
42、alling, the called party subscription information stored in the HLR, and the MT CUG call authorization function, see Functions clause. On successful authorization, the HLR supplies the GMSC with CG information for the continuation of the call establishment. On unsuccessful authorizations the HLR rej
43、ects the call supplying an indication of the reason for failure. 1.1.2.3 MT CUG handling functions at the MSC The MSC shall pass any CG related information received in incoming call establishment signalling to the VLR. If the VLR returns CUG information to the serving MSC in response, the MSC shall
44、pass the information to the called party in the call Set-up signalling. If the CUG call is rejected by the VLR (due to the call forwarding interaction) the MSC shall return an indication to the originating network. 1.1.2.4 MT CUG handling functions at the VLR When the VLR receives an incoming call e
45、nquiry for a CG subscriber, it shall attempt to provide a CG call indication to the called party. The indication is sent depending on the attributes of the incoming call and the called parties subscription, as shown in table 1.1. The indication is achieved by sending the CUG Index, associated with t
46、he Interlock Code of the invoked CUG, to the called user. STD*ETSI GSR 03-85-ENGL L77b = 3400855 0352787 017 Page 11 GSM 03.85 version 5.0.0: December 1996 Match No Match Match No Match - Table 1.1 : CUG Index provision at terminating VLR - Index - Index - - - Index - Index No Index No Index - No In
47、dex - No Index No Index Calling Party CUG Infor- mation I Called party subscription 1 CUG subscriber Normal Subscriber Interlock check No ICB ICB No ICB _ Interlock Interlock + Outgoing Access No CUG Info. NOTE: “-I = Not Applicable, this check is not performed since such calls are rejected by the c
48、alled parties HLR. 1.1.3 CUG subscriber roaming requirements Normal CUG restrictions apply to CUG subscribers when roaming in CUG supporting GSM PLMNs. Extra restrictions (specified in GSM 02.85) are applied to CG subscribers roaming in non-CUG GSM VPLMNs to preserve the integrity of CUG. These rest
49、rictions are applied by the application of call barring programmes which are not under user control. Such restrictions only apply to a subscribers ability to make outgoing calls using CUG related basic services. Extra restrictions are not applicable in the MT call case since the requirements are met by the HLR MT CUG authorization function and by CUG interworking restrictions. When a CG subscriber first roams into a network not supporting CUG, the HLR will pass to the VLR subscription data indicating that normal Outgoing Call Barring is activ
