Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Patent
1996-08-13
1999-02-16
Bost, Dwayne D.
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
455404, 455457, H04Q 732
Patent
active
058730400
ABSTRACT:
A system arrangement and method are disclosed for determining location of a wireless mobile unit involved in a call for public emergency assistance (e.g. a "911" call). The system is cost-effective in that it makes extensive use of existing telecommunication infrastructures, and does not require either special hardware or software at either the mobile unit site or the emergency assistance center handling a call. The system features shared use of a computer and specially defined database among a plurality of mobile switching offices serving a larger plurality of mobile base stations, the latter serving an even larger plurality of antenna and transceiving sites within predefined cellular regions. Signal strength measurements at the base stations are passed through the switching offices to a shared computer, and the latter uses the measurements to calculate a small area for which it would be practical to conduct a search if the mobile unit user requiring assistance is unable to help in determining his/her location. The calculated area and database are used to furnish the emergency assistance center handling the call with a detailed mapping of the calculated area, highlighting specific features (terrain, buildings, signs, etc.) that could be used to question the caller in a manner likely to produce responses from which the caller's location could be either precisely fixed or at least narrowed to a small part of the mapped area.
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Clement Driscoll, Locating wireless 911 callers, Jul. 1995.
Dunn James M.
Stern Edith Helen
Bost Dwayne D.
Gelin Jean A.
International Business Machines - Corporation
Lieber Robert
Tomlin Richard A.
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