Portable telephone system

US6301472A · kind A · utility

Assignee

• Mitsubishi Electric Corporation · JP

Inventors

• Jiro Nakasu · Tokyo, JP
• Hideki Hayashi · Yoshikawa, JP
• Tomoaki Tsukada · Tokyo, JP
• Kunio Kodaka · Tokyo, JP
• Yasushi Onooka · Chigasaki, JP
• Kazuhiro Yamamoto · Kasai, JP
• Shunji Yamanaka · Tokyo, JP
• Yuji Mitani · Yokohama, JP

Key dates

• Filing date: Dec 1, 1998
• Grant date: Oct 9, 2001
• Expiry date: Dec 1, 2018

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04W88/02
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

A switching system (3) has, in addition to an ordinary accounting function, an origination-only accounting control unit 6 to monitor the number of message units used by an origination-only portable telephone (1B) identified by a terminal identification number and to deny the origination of a call by the origination-only portable telephone (1B) upon the increase of the number of used message units to a predetermined number. The origination-only accounting control unit (6) accepts the origination of a call made by the origination-only portable telephone (1B) when a prescribed input about the origination-only portable telephone (1B) is given thereto by a system operator by operating a predetermined terminal device (7) or the like after the denial of origination of a call by the origination-only portable telephone (1B).