The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 21, 1999
Filed:
Nov. 24, 1997
Jan Hornfeldt, Farentuna, SE;
Lennart Rinnback, Jarfalla, SE;
Telefonaktiebolaget L M Ericsson (publ), Stockholm, SE;
Abstract
A number of different solutions are described for gathering access delay and distance measurement information for use in determining the position of a cellular mobile station. For all of these solutions, one frequency and one uplink channel in each cell are dedicated for position determination. In one aspect of the present invention, a method is provided for determining the position of a mobile station using handover procedures for all of the cells or certain predefined cells in the network. One uplink channel is dedicated within each cell in the network to be used for position determination. These positioning channels continuously listen for handover access requests. Cells detecting the access bursts can measure the access delay and determine the distance to the requesting mobile station. A triangulation calculation is used to pinpoint the mobile station's position. In another aspect of the present invention, a method is provided for determining the position of a mobile station using position determination procedures for all of the cells or certain predefined cells in the network.