Method and system for code reuse and capacity enhancement...

H - Electricity – 04 – B

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H04B 1/707 (2006.01) H04B 7/02 (2006.01) H04B 7/06 (2006.01) H04B 7/216 (2006.01) H04Q 7/36 (2006.01)

Patent

CA 2466042

The number of users (USER A, USER B) and data (dA, dB) capacity of wireless systems (Fig. 1) are increased by employing apparatus and method for increasing the number of spreading codes (CA, CB) available in the system by providing a mechanism to reuse the already allocated spreading code or use the codes that may correlate to those already being used within the same sector/cell. This, in return, provides capacity improvement proportional to the number of added base station (BS) antennas (1, 2, 3) for each cell. An antenna null steering technique for code allocation maintains the cross correlation properties of the codes only for the desired user and to obtain a gain in capacity improvement.

Le nombre d'utilisateurs (UTILISATEUR A, UTILISATEUR B) et de capacité de données (d<SB>A</SB>, d<SB>B</SB>) de systèmes sans fil (figure 1) augmente par l'utilisation d'un appareil et d'un procédé permettant d'augmenter le nombre de codes d'étalement (C<SB>A</SB>, C<SB>B</SB>), disponibles dans le système, par le biais d'un mécanisme permet de réutiliser le code d'étalement déjà attribué, ou d'utiliser les codes qui peuvent être corrélés à ceux déjà utilisés à l'intérieur du même secteur/cellule. Ceci, en retour, permet d'améliorer la capacité proportionnellement au nombre d'antennes (1, 2, 3) de station de base (BS) ajoutées pour chaque cellule. Une technique d'antenne non orientable pour attribution de code permet de maintenir les propriétés de trans-corrélation des codes uniquement pour l'utilisateur voulu et d'obtenir un gain au niveau de l'amélioration de la capacité.

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