Improved cdma soft hand-off

H - Electricity – 04 – W

Patent

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H04W 36/30 (2009.01)

Patent

CA 2356654

A system and method for improving soft hand-off in a CDMA system uses mobile station location and velocity information to maintain soft hand-off legs with those cells in which the mobile station is more likely to be located. The system and method of the present invention estimates the weighted probability of the mobile station arriving in neighboring cells and produces "bias" values for those cells that the mobile station is more likely to be entering or to be located in. These bias values are used for modifying signal quality values for those cells, and for determinig whether the current cell or neighbor cells are to be placed in an active set so as to establish, or maintain, soft hand-off legs. The system and method of the present invention thus chooses those cells which are more likely to be retained as soft hand-off legs and therefore reduces the overall number of soft hand-offs.

Cette invention concerne un système et un procédé permettant d'améliorer les transferts souples dans un système AMCR (accès multiple par code de répartition) qui font intervenir des informations sur la position d'une station mobile et sur la vitesse pour maintenir des branches de transfert avec les cellules dans lesquelles la station mobile a le plus de chances de se trouver. Ce système et ce procédé consistent àstimer la probabilité pondérée qu'à la station mobile d'arriver dans ces cellules voisines, et de produire des valeurs de </= polarisation >/= pour celles de ces cellules dans lesquelles il est le plus vraisemblable que la station mobile soit localisée. Ces valeurs de polarisation servent à modifier les valeurs de qualité du signal pour les cellules en question et à déterminer s'il faut placer la cellule ou les cellules voisines momentanées dans un jeu actif de manière à créer ou à maintenir des branches de transfert souple. Ainsi, ce système et ce procédé permettent de choisir celles des cellules qui ont le plus de chances d'être retenues comme branches de transfert souple et, par là même, de réduire le nombre global de ces transferts.

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