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Method of directing a call to a mobile telephone in a dual mode cellular satellite communication network

  • US 6,195,555 B1
  • Filed: 06/24/1997
  • Issued: 02/27/2001
  • Est. Priority Date: 01/11/1994
  • Status: Expired due to Term
First Claim
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1. A method of directing a call to a mobile telephone in a dual-mode cellular-satellite communications network, comprising the steps of:

  • transmitting an alert signal to said mobile telephone using base stations of said cellular network if the mobile telephone is currently registered as active in a cellular network;

    receiving said alert signal at said mobile telephone;

    transmitting a response to said cellular network as an acknowledgement;

    upon non-receipt of said acknowledgement by the cellular network within a defined period of time, transmitting a last known location of the mobile telephone from said cellular network to a satellite earth station; and

    upon receipt of said last known location of the mobile telephone at said satellite earth station, using said last known location to determine a satellite antenna beam most likely to be received by said mobile telephone and transmitting an alert signal to said mobile telephone via a satellite using said antenna beam.

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