Digital mobile telephone system in which each subscriber is assigned a telephone number and several subscriber identity module (SIM) cards

US5657373A · kind A · utility

Assignee

• Europolitan AB · SE

Inventors

• Jan Hermansson · Karlskrona, SE
• Christer Mansson · Karlskrona, SE
• Anders Jacobsson · Solna, SE
• Zeth Nystrom · Nybro, SE
• Bo Karlsson · Eskilstuna, SE
• Christer Palmgren · Karlskrona, SE
• Goran Leuhusan · Karlskrona, SE
• Flemming Orneholm · Karlskrona, SE

Key dates

• Filing date: Sep 5, 1995
• Grant date: Aug 12, 1997
• Expiry date: Sep 5, 2015

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04W8/18
• WIPO field: Digital communication
• WIPO sector: Electrical engineering

Abstract

A digital mobile communication system comprises a switching center (MSC), a subscriber register (HLR) connected thereto, mobile terminals, such as mobile telephones, and subscriber-linked subscriber's cards, such as smart cards. Each subscription is allocated a subscriber's number and at least two subscriber's cards adapted to be activated so as to open a mobile terminal to incoming as well as outgoing traffic when inserted therein. When one of the subscriber's cards is activated, the other card or cards are necessarily deactivated so as to open a mobile terminal only to outgoing traffic when inserted therein. The subscriber register (HLR) is adapted to control the activation and the deactivation of the cards by the order of the subscriber.