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Method for multi-mode handoff using preliminary time alignment of a mobile station operating in analog mode

  • US 5,870,427 A
  • Filed: 06/01/1995
  • Issued: 02/09/1999
  • Est. Priority Date: 04/14/1993
  • Status: Expired due to Term
First Claim
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1. In a multi-channel communication system in which a mobile station is designed for communication with one or more base stations over analog and digital communication channels using analog and digitally modulated communication signals, respectively, a method for maintaining a connection initiated on the analog communication channel comprising the steps of:

  • time aligning said mobile station to a predetermined system time of said base station;

    identifying an available digital communication channel; and

    transmitting to said mobile station over said analog communication channel a handoff message and performing handoff of the connection to the available digital communication channel.

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