G - Physics – 01 – S
Patent
G - Physics
01
S
G01S 5/14 (2006.01) H04Q 7/36 (2006.01)
Patent
CA 2362517
A method and apparatus for efficiently transmitting location assistance information to a mobile communication device over a control channel with a minimal impact on the capacity of the control channel. A position location server provides a difference between satellite locations which have been computed using Almanac data and then Ephemeris data. Sending only the difference between the locations and clock corrections computed using the two different data types, the total amount of information to be transmitted to a mobile communication device is significantly reduced. Furthermore, by providing rate of change information, the method and apparatus allows the location assistance information to remain valid for a relatively long time after it has been received by the mobile communication device.
L'invention concerne un procédé et un appareil permettant d'assurer la transmission efficace, sur une voie de commande, d'une information d'assistance de localisation à un dispositif de communication mobile, en ayant un impact minime sur la capacité de ladite voie de commande. Un serveur de localisation fournit l'écart entre les positions de satellite calculées au moyen des données Almanac puis des données Ephemeris. En transmettant seulement l'écart entre les positions et les corrections d'horloge calculées avec les deux types de données différents, on réduit considérablement le volume total de l'information à transmettre vers un dispositif de communication mobile. Enfin, en fournissant une information sur le degré de changement, le procédé et le dispositif décrits permettent de maintenir la validité de l'information d'assistance de localisation pendant un temps relativement long, après la réception par le dispositif de communication mobile.
Agashe Parag A.
Soliman Samir S.
Vayanos Alkinoos Hector
Qualcomm Incorporated
Smart & Biggar
LandOfFree
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