Selective resynchronization in a digital cellular...

H - Electricity – 04 – Q

Patent

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Details

H04Q 7/38 (2006.01) H04L 9/12 (2006.01) H04Q 7/30 (2006.01) H04Q 7/32 (2006.01)

Patent

CA 2175340

In a ciphered digital cellular communications system a method and apparatus are presented for selective resynchronization of the cipher upon initial channel acquisition or handoff. Where synchronization between the old channel and the new channel exists, the base station indicates along with an initial Traffic Channel Designation (ITCD) message or handover message that no resynchronization is required. Where, synchronization between the old channel and the new channel does not exist, the base station provides an indication along with an ITCD or handover message that resynchronization is required and from the content of this message the manner in which resynchronization is to be achieved is further indicated. By providing options for resynchronization security may be optimized or compromised for handover speed depending upon the specific requirements of the base station or the mobile station.

L'invention concerne un système cellulaire numérique permettant des télécommunications chiffrées. Elle concerne également un appareil et un procédé permettant une resynchronisation sélective du chiffrage au moment de l'accès initial à un canal ou d'un transfert. Lorsqu'il y a synchronisation entre l'ancien canal et le nouveau canal, le poste de base indique au moment du message de désignation initiale du canal ou de transfert qu'aucune resynchronisation n'est nécessaire. Lorsqu'il n'y a pas synchronisation entre l'ancien canal et le nouveau canal, le poste de base fournit, avec le message de désignation initiale du canal ou de transfert, une indication qu'une resynchronisation est nécessaire. En outre, ce message indique la manière dont la resynchronisation doit se faire. Les différentes possibilités de resynchronisation permettent d'optimiser la sécurité ou au contraire de la diminuer quant à la vitesse de transfert, le choix se faisant en fonction des besoins spécifiques du poste de base ou du poste mobile.

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