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. 23, 2003
Filed:
Jan. 14, 1999
Timo Rantalainen, Helsinki, FI;
Ville Ruutu, Espoo, FI;
Nokia Mobile Phones Limited, Espoo, FI;
Abstract
A cellular radio network based positioning system for determining the position of a mobile station ( ). For each base transceiver station ( to ) or cell of the network, a fixed list of base transceiver stations is stored by a Mobile Positioning Centre ( ). Each list identifies those base transceiver stations which enable the position of a mobile station served by the corresponding base transceiver station ( ) to be optimally determined. The list is transmitted to the mobile station ( ) via the serving base transceiver station ( ) together with a list of respective real time differences which exist between the serving base transceiver stations and the listed base transceiver stations. The mobile station determines an observed time difference for each of the listed base transceiver stations, relative to the serving base transceiver station ( ), from signals broadcast by the listed base transceiver stations. The mobile station listens for synchronization sequences contained in these signals during time windows defined by the various real time differences. The observed time differences are transmitted from the mobile station ( ) to the serving base transceiver station ( ) and are used by the network to compute the position of the mobile station ( ).