Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Patent
1996-04-22
1998-10-06
Bost, Dwayne D.
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
455422, 455424, 455425, 455432, H04Q 732
Patent
active
058191763
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method for operation of a mobile radio network according to the preamble of claim 1.
At identification by the identification number, the latter usually stored in a subscriber identification module, the subscription.sup.1 is verified with the aid of an authentication code stored as well in the subscriber identification module. The subscriber identification modules--briefly called SIM--may be fashioned as a card with an integrated circuit as memory--hereafter called telecard, or also card--or as a plug-in SIM.
Increasing popularity of mobile radiotelephones spawns among subscribers the desire for being reachable under a common phone number also when several mobile radiotelephones are used. In mobile radio networks according to the GSM standard this cannot be accomplished by issuing to the subscriber two identical telecards with the same assigned phone numbers. The safety concept of the GSM standard does not permit the setup and operation of two identical subscriber identification modules with identical identification numbers and authentication codes.
The document WO 92/19078 A1 describes a method for operation of a mobile radio network where a subscriber identiy module (SIM) is provided with at least two user identities that can be activated by the user selectively. Thus, only one user identity can be active presently. When a call arrives for the identity that is not active, this call is relayed to the active subscriber identity by means of the GSM function "call forwarding unconditional" (CFU). The CFU function is limited to call forwarding, leading in the case of subscribers desiring more than to identities to problems.
WO 93/03585 A1 describes a telecommunication system where each mobile telephone of a specific group has certain call characteristics assigned to it, which determine, e.g., the length of time, point in time, and type of a call. These call parameters can be controlled centrally for each mobile station.
Known from EP 0 481 714 A2 is a method for identification of subscribers of a cellular telephone network that shows how a user making use, e.g., for the first time of an exchange smart card can be recognized and registered in the telephone system without difficulty. The problem involved is that the subscriber identity changes upon receipt of an exchange smart card and, to begin with, it is known only to the home location register (HLR). The method now provides for acquiring, by the addressed visitor location register (VLR), at first-time use of an exchange smart card the new identity immediately from the home location register (HLR).
The older patent application WO 94/08433 A1 with priority date of Oct. 1, 1992, published on Apr. 14, 1994, describes a digital mobile phone system in which each subscriber is assigned a phone number and several user identity modules (SIM). Each of these subscriber cards enables the use of a mobile telephone for making and receiving calls, wherein only one of the subscriber cards can be activated presently while the other is deactivated. For control of the activation of the individual subscriber identity modules, the home location register (HLR) is queried.
The objective underlying the present invention is to provide a method for operation of mobile radio network in which subscribers are able to operate two or, as the case may be, several radio telephones with different subscriber identification modules and can be reached under a common calling number.
This objective is accomplished according to the invention by the technical teaching of claim 1.
The advantage of the inventional method is that the subscriber with two telecards issued can be reached alternatively on both telecards via a common number and needs to disseminate only one phone number. Also in the case of outgoing calls, i.e., with the subscriber dialing, a called subscriber can be presented an identical caller number from both cards, with the aid of the "Calling Number Identification Presentation" service.
A further advantage of the inventional method is that all special servi
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Bost Dwayne D.
DeTeMobil Deutsche Telekom MobilNet GmbH
Scott L. C.
LandOfFree
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