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Cellular telecommunication switching system for providing public emergency call location information

  • US 5,388,147 A
  • Filed: 08/30/1993
  • Issued: 02/07/1995
  • Est. Priority Date: 08/30/1993
  • Status: Expired due to Term
First Claim
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1. A cellular switching system for providing public emergency call service to a cellular telephone set, comprising:

  • means for detecting a public emergency call from a cellular telephone set;

    means for requesting the transmission of geo-coordinates from the cellular telephone set;

    means for converting the geo-coordinates received as digital information from the cellular telephone set to location information;

    means for establishing a digital link to the public safety answering point system;

    means for transmitting the location information to a public safety answering point system and for establishing a voice communication path between the cellular telephone set and the public safety answering point system;

    the convening means further adapted for translating the location information into audio information upon the means for establishing the digital link being unable to establish a digital link to the public safety answering point system; and

    the transmitting means further adapted for communicating the audio information to the public safety answering point system.

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