A method for performing a soft handoff

Details A method for performing a soft handoff A method for performing a soft handoff

H - Electricity

04

Q

H04Q 7/38 (2006.01)

Patent

CA 2245241

The present invention increases the success rate of soft handoffs by enhancing the ability of a mobile-telephone to receive a handoff direction message that identifies the traffic channel being assigned to enable a candidate base station to communicate with the mobile-telephone. Specifically, the aforementioned ability of the mobile-telephone is enhanced by using the candidate base station to transmit the handoff direction message on a communication channel belonging to the candidate base station and being listened to by the mobile-telehone. In situations where signals transmitted from active set base stations have a low signal-to-noise ratio at the mobile-telephone, signals transmitted from the candidate base station may have a higher signal-to-noise ratio at the mobile-telephone. In these situations, the transmission of the HD messages from the candidate base station increases the likelihood that a copy of the handoff direction message will be successfully received by the mobile-telephone, therebyenhancing the success rate of soft handoffs.

L'invention permet d'augmenter le taux de réussite de transfert de communications sans rupture en améliorant la capacité d'un radiotéléphone mobile à recevoir un message de direction de transfert qui identifie le canal de trafic assigné afin de permettre à une station de base choisie de communiquer avec le radiotéléphone mobile. Spécifiquement, on améliore cette capacité du radiotéléphone en utilisant la station de base choisie afin de transmettre le message de direction de transfert sur un canal de trafic utilisé par la station de base choisie et surveillé par le radiotéléphone. Dans les cas où les signaux émis par des stations de base actives ont un faible rapport signal/bruit au radiotéléphone mobile, les signaux émis par la station de base choisie peuvent avoir un rapport signal/bruit plus élevé au radiotéléphone mobile. Dans ces cas, la transmission des messages de direction de transfert depuis la station de base choisie augmente la possibilité qu'une copie du message soit reçue avec succès par le radiotéléphone, améliorant ainsi le taux de succès des transferts de communications sans rupture.

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