Patent Number: 6,169,903

Title: Method and apparatus in a wireless communication system for determining a location at which a subscriber unit is positioned

Abstract: Sub-areas (506) within a coverage area of a wireless communication system are defined (702), and transmitters (502, 504) are positioned within the sub-areas. A memory (212, 314), in at least one of a subscriber unit (122) and a controller (112) of the system, is programmed (706) with unique transmitter identifiers (414) and corresponding transmitter locations; and a locator signal (406) is periodically transmitted (708) from the sub-areas during time slots (408) coordinated such that, within a sub-area, no more than one transmitter transmits during each time slot. The locator signal includes one of the unique transmitter identifiers for identifying the transmitter sending the locator signal. The subscriber unit monitors (710) the locator signal to determine propagation delays between the subscriber unit and the transmitters received; and one of the subscriber unit and the controller estimates (712) the location of the subscriber unit from the propagation delays and the transmitter locations corresponding to the unique transmitter identifiers received.

Inventors: Dorenbosch; Jheroen Pieter (Paradise, TX), Souissi; Slim (Fort Worth, TX)

Assignee: Motorola, Inc.

International Classification: H04Q 7/08 (20060101); H04Q 7/38 (20060101); H04B 007/00 ()

Expiration Date: 01/02/2018