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. 27, 2001
Filed:
Jun. 24, 1997
Paul W. Dent, Stehag, SE;
Ericsson Inc., Research Triangle Park, NC (US);
Abstract
A method of directing a call to a mobile telephone in a dual mode cellular satellite communications network is disclosed. An alert signal is transmitted to the mobile telephone using base stations of the cellular network if the mobile telephone is currently registered as active in a cellular network. When the alert signal is received at the mobile telephone, the mobile telephone transmits a response to the cellular network as an acknowledgement. When an acknowledgement is not received by the cellular network within a defined period of time, the cellular network transmits the last known location of the mobile telephone to the satellite earth station. Upon receipt of the last known location of the mobile telephone, the satellite earth station using the last known location determines a satellite antenna beam most likely to be received by the mobile telephone and transmits an alert signal to the mobile telephone via the satellite using the antenna beam.