H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 7/155 (2006.01) H04L 27/26 (2006.01)
Patent
CA 2722448
Systems and methods for determining the relative velocity of a subscriber station with respect to a basestation are provided. In one embodiment, the method comprises sending a query message from a basestation to a subscriber station, the query message requesting a current modulation frequency used by the subscriber station to modulate transmis-sions; receiving a response to the query message, the response including the current modulation frequency; determining an offset between the cur-rent modulation frequency and a target carrier frequency value; and calcu-lating a velocity of the subscriber station based on the offset.
Linvention concerne des systèmes et des procédés pour déterminer la vitesse relative dune station dabonné par rapport à une station de base. Dans un mode de réalisation, le procédé comprend lenvoi dun message de requête dune station de base à une station dabonné, le message de requête demandant une fréquence de modulation de courant utilisée par la station dabonné pour moduler les transmissions; la réception dune réponse au message de requête, la réponse comprenant la fréquence de modulation de courant; la détermination dun décalage entre la fréquence de modulation de courant et la valeur de fréquence porteuse cible; et le calcul dune vitesse de la station dabonné en se basant sur le décalage.
Adc Telecommunications Inc.
Smart & Biggar
LandOfFree
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