Method and system for performing an optimised hand over

Details Method and system for performing an optimised hand over Method and system for performing an optimised hand over

H - Electricity

04

Q

H04Q 11/04 (2006.01) H04L 12/56 (2006.01) H04Q 7/38 (2006.01) H04Q 7/24 (2006.01)

Patent

CA 2295514

Method and system for performing an optimised hand over between a first base station BS1 and a second base station BS2, wherein a mobile terminal MT requests a hand over. During hand over the loss of data has to be avoided and a fast retransmission should be provided. Further the hand over is preferably under the control ofthe mobile terminal MT initialising the hand over. The invention therefore provides a method and a system where an information stream is divided into segments and where each segment is numbered. The numbered segments are transmitted via the first communication path P1 and via the first base station (BS1) to the mobile terminal MT and at the same time they are stored in a buffer (BF) on the second communication path P2 to the second base station (BS2), which is the one where the hand over is requested to. After the execution of the hand over one numbered segment identified by the exact number is requested via the second communication path P2. The numbered segment is then available for the mobile terminal MT and is exactly specified by the concrete number.

La présente invention concerne un procédé et un système d'optimisation de changement de cellule entre une première station de base (BS1) et une seconde station de base (BS2), pour lesquels c'est le terminal mobile (MT) qui demande un transfert de cellule. Pendant le transfert de cellule, on cherche à éviter la perte de données et à effectuer une transmission rapide. Le transfert de cellule, en outre, s'exécute, de préférence, sous la commande du terminal mobile (MT) qui demande le transfert de cellule. Le système et le procédé de l'invention permettent de découper un flux d'informations en segments numérotés. Ces segments numérotés sont transmis vers le terminal mobile (MT) via la première voie de communication (P1) et via la première station de base (BS1) et sont stockés, au même moment, dans un tampon (BF), sur la seconde voie de communication (P2), vers la seconde station de base (BS2) qui est celle au profit de laquelle le transfert de cellule est demandé. Après l'exécution du transfert de cellule, un segment numéroté identifié par le numéro exact est demandé via la seconde voie de communication (P2). Le segment numéroté est ensuite disponible pour le terminal mobile (MT) et est exactement spécifié par son nombre concret.

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