Coded allocation for sectorised radiocommunication systems

H - Electricity – 04 – W

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H04W 74/00 (2009.01) H04J 13/00 (2006.01)

Patent

CA 2328469

Multiple code sets are introduced in the downlink of a CDMA system to allow for more connections in each cell. The codes are then allocated to different users taking into account the interference therebetween. The interference depends on the antenna gains, transmission powers used and cross-correlations between codes. By estimating these parameters the interference can be minimized in the code allocation process. Since the allocation of codes and code sets to geographical areas within a cell may change over time, code handoff is supported.

Des ensembles de codes multiples sont introduits dans la liaison descendante d'un système CDMA pour augmenter le nombre de connexions dans chaque cellule. Les codes sont ensuite affectés à différents utilisateurs avec prise en compte de l'interférence entre eux. L'interférence dépend des gains d'antenne, des puissances de transmission utilisées et des codes entre les corrélations croisées. L'estimation de ces paramètres permet de réduire l'interférence dans le procédé d'affectation de code. L'affectation de codes et d'ensembles de codes à des zones géographiques à l'intérieur d'une cellule pouvant changer dans le temps, le transfert de code est assuré.

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