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Directed retry method for use in a wireless location system

  • US 6,115,599 A
  • Filed: 01/22/1999
  • Issued: 09/05/2000
  • Est. Priority Date: 01/08/1999
  • Status: Expired due to Term
First Claim
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1. A method for use in dual mode wireless communications systems, operated by one or more wireless carriers, supporting at least a first modulation method and a second modulation method, wherein the first and second modulation methods are used on different RF channels, wherein a wireless transmitter is capable of supporting both modulation methods, and wherein it is preferred that emergency 911 calls generally take place with the first modulation method, comprising the steps of:

  • when the wireless transmitter is currently using the second modulation method and attempts to originate a call to 911, causing the wireless transmitter automatically to switch to the first modulation method; and

    originating the call to 911 using the first modulation method on one of the set of RF channels prescribed for use in the first modulation method.

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