06049711 is referenced by 210 patents and cites 50 patents.

A method and system for providing location-based information services to a requesting user. A subscriber unit transmits an access request message comprising an identification number to one or more receiving sites on a response channel. A forward channel message is sent to the subscriber unit, the forward channel message comprising the identification number of the subscriber unit and data defining the time slot for transmission of a response message. A response message comprising an information service request and a location signal is transmitted from the subscriber unit and received at at least three receiving sites during the time interval identified by the forward channel message. The time difference of arrival of the location signal is used to determine the location of the subscriber unit. Thereafter, an information service message is generated which is responsive to the information service request and the location of the subscriber unit and transmitted to the subscriber unit on the forward channel. The step of generating the information service message comprises the steps of creating a database request from the information service request and the subscriber unit location, receiving database information response to the database request and the subscriber unit location, and processing and combining the database information to produce an information service message.

Title
Method and apparatus for providing location-based information services
Application Number
8/518141
Publication Number
6049711
Application Date
August 23, 1995
Publication Date
April 11, 2000
Inventor
John A Baker
Playa del Rey
CA, US
James E Forman
Westchester
CA, US
Doron Ben Yehezkel
Los Angeles
CA, US
Agent
Roylance Abrams Berdo & Goodman L
Assignee
Teletrac
CA, US
IPC
H04Q 7/22
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