Intercell handover method for a mobile station call in a...

H - Electricity – 04 – Q

Patent

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H04Q 7/38 (2006.01)

Patent

CA 2202929

A secure handover method for a call to a mobile station (M), including a cycle wherein up call data (DM) transmitted by the mobile station (M) on a current channel (CH1) to a current base station are received (ET3) by a subsequent base station (B(n)) on a subsequent channel (CH2), down call data are simultaneously transmitted (ET5) for a given time (T) on said current and subsequent channels (CH1, CH2) by the current and subsequent base stations (B(n-1), B(n)) respectively, as long as (ET4) the time lag (TA) between the respective reception times of said up data on the current (CH1) and subsequent (CH2) channels is lower than a first predetermined threshold (S), and when said time (T) has elapsed, the call is released (ET6, LIB) on said current channel and enabled on the subsequent channel (CH2), which becomes the new current channel.

Le procédé de transfert sécurisé d'une communication établie avec un mobile (M) comprend les étapes cycliques de: réception (ET3) par une station de base suivante (B(n)) dans un canal suivant (CH2), de données montantes (DM) de la communication qui sont émises par le mobile (M) dans un canal courant (CH1) vers une station de base courante; émission simultanée (ET5), pendant une durée donnée (T), de données descendantes de la communication dans lesdits canaux courant et suivant (CH1, CH2), respectivement par lesdites stations de base courante et suivante (B(n-1)), B(n)), dès lors (ET4) qu'une différence de marche temporelle (TA) entre des instants respectifs de réception desdites données montantes dans les canaux courant (CH1) et suivant (CH2), est inférieure à un premier seuil prédéterminé (S); et à l'expiration de ladite durée donnée (T), libération (ET6, LIB) de ladite communication dans ledit canal courant, et validation de ladite communication dans le canal suivant (CH2), en un nouveau canal courant.

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