Patent Number: 7,089,019

Title: Location systems and cellular communication networks

Abstract: A location system for use in a mobile communication network includes base stations which transmit known signals at predetermined times for use in deriving location data; a first transmitting and receiving units; a unit for determining times of arrival of the known signals from each base station at each of the first transmitting and receiving units; a unit for determining times of arrival of the known signals from each base station at a second transmitting and receiving unit at an unknown location; a comparing unit for comparing timing differences between the known signals received at the first transmitting and receiving units and the second transmitting and receiving unit; and location determining unit for determining the location of the second unit. Each of the first transmitting and receiving units includes a unit for deriving its location from a further set of received signals such as GPS signals.

Inventors: Ormson; Richard (Berkshire, GB)

Assignee: NEC Corporation

International Classification: H04Q 7/20 (20060101)

Expiration Date: 8/08/02018