The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 20, 2001
Filed:
Jul. 29, 1998
Michael Charles Gerald Lee, Ottawa, CA;
Francis Durufle, Hull, CA;
Nortel Networks Limited, Montreal, CA;
Abstract
In the occurrence of a multi-mode portable handset leaving the coverage area of a first operating network during an active telephone call on the first operating network, a method is disclosed for terminating the telephone call and re-initiating it within a second operating network. The signal strength and bit error rate corresponding to the first operating network are monitored during the telephone call. When it is determined that the handset is leaving the coverage area using these indicators, the handset warns both parties in the conversation. With use of the redial function or CLID (Calling Line Identification) the telephone number of the party other than the user of the portable handset is determined. The handset proceeds to terminate the call on the first operating network and dials the telephone number corresponding to the other party on the second operating network. The telephone conversation can then proceed on the second operating network with a minimum inconvenience to the user of the handset.