H - Electricity – 04 – Q
Patent
H - Electricity
04
Q
H04Q 7/38 (2006.01) H04B 7/26 (2006.01)
Patent
CA 2241340
The invention relates to a process for determining time advance information in a cellular radiocommunication system, of the type comprising the following steps: a mobile station interrupts (1) its communication, on a current channel, with a first base station to send (2) to a second base station, on a first target channel, a sequence of synchronization signals allowing the said second base station to calculate (4) time advance information associated with the said mobile station in relation to the said second base station; the mobile station resumes (3) its communication, on the said current channel, with the first base station immediately after sending to the second base station the said sequence of synchronization signals; the said time advance information calculated by the said second base station is transmitted (5, 6), via at least one controller, to the said mobile station. According to the invention, the said first target channel is an access channel common to a plurality of mobile stations.
L'invention concerne un procédé de détermination d'une information d'avance temporelle dans un système de radiocommunication cellulaire, du type comprenant les étapes suivantes: une station mobile interrompt (1) sa communication, sur un canal courant, avec une première station de base pour envoyer (2) à une seconde station de base, sur un premier canal cible, une séquence de signaux de synchronisation permettant à ladite seconde station de base de calculer (4) une information d'avance temporelle associée à ladite station mobile vis-à-vis de ladite seconde station de base ; la station mobile reprend (3) sa communication, sur ledit canal courant, avec la première station de base immédiatement après avoir envoyé à la seconde station de base ladite séquence de signaux de synchronisation; ladite information d'avance temporelle calculée par ladite seconde station de base est transmise (5, 6), via au moins un contrôleur, à ladite station mobile. Selon l'invention, ledit premier canal cible est un canal d'accès commun à une pluralité de stations mobiles.
Desorbay Eric
Roberts Michael
Alcatel
Alcatel Alsthom Compagnie Generale D'electricite
Robic
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