Method for estimating speed of a mobile station in a...

G - Physics – 01 – S

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G01S 11/10 (2006.01) H04Q 7/22 (2006.01) H04Q 7/32 (2006.01) H04Q 7/38 (2006.01)

Patent

CA 2271802

A method is provided for accurately estimating the speed of mobile stations in a cellular communications system. Taking into account the Doppler shift of the information in a received burst, a frequency offset value is calculated for each received burst. For each burst, a signal quality value is calculated, which is compared with a predetermined signal quality threshold level. The absolute value of each of the frequency offset values whose signal quality value meets or exceeds the predetermined signal quality threshold is obtained. The frequency offset values whose signal quality values do not meet the threshold level are disregarded. The total mean of all of the absolute frequency offset values is then calculated. The total mean value is used to accurately estimate the speed of the mobile station. Consequently, the speed of faster and slower mobile stations can be readily distinguished, and a hierarchical cell structure can be effectively used to increase capacity and reduce handovers in a cellular communications system.

L'invention porte sur un procédé d'estimation précise de la vitesse d'une station mobile dans un système cellulaire de télécommunications. En tenant compte de l'effet Doppler de l'information d'un paquet reçu, on calcule le décalage de fréquence pour chaque paquet reçu. Pour chacun des paquets, on calcule un facteur de qualité de signal qu'on compare avec un seuil prédéterminé de qualité de signal. On obtient ainsi la valeur absolue de chacun des décalages de fréquence dont la qualité de signal atteint ou dépasse le seuil prédéterminé de qualité de signal. Les décalages de fréquence dont la qualité du signal n'atteint pas le niveau du seuil sont rejetés. On calcule ainsi la moyenne totale des décalages de fréquence laquelle permet une estimation précise de la vitesse de la station mobile. On peut ainsi distinguer facilement les vitesses des stations mobiles lentes et de celle des stations rapides et utiliser efficacement la structure hiérarchique des cellules pour améliorer la capacité, et réduire les transferts dans un système cellulaire de télécommunications.

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