System and method for increasing cdma capacity by frequency...

H - Electricity – 04 – W

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H04W 16/04 (2009.01) H04W 24/10 (2009.01)

Patent

CA 2718110

A system increases the capacity of a CDMA network having a plurality of cell sites (4110, 4120, 4130). The system defines a pool of frequencies (F1, F2) available for assignment, and assigns one of the available frequencies (F1, F2) to each of the cell sites (4110, 4120, 4130) so as to minimize the number of neighboring cell sites assigned a same one of the available frequencies (F1, F2). By deploying different frequencies (F1, F2) in the cell sites (4110, 4120, 4130), the amount of interference caused by neighboring cell sites reduces. As a result, the capacity of each of the cell sites (4110, 4120, 4130) operating at a single frequency (F1 or F2) can be increased, so long as there remains sufficient power to reach the mobile units (4200) operating within the cell site (4110, 4120, 4130). The system attains maximum benefits when the cell sites (4110, 4120, 4130) are located close together and the propagation exponent is low (for example, 10-20 dB/decade).

Ce système permet d'augmenter la capacité d'un réseau AMCR comprenant plusieurs sites de cellules (4110, 4120, 4130) et consiste à définir un groupe de fréquences (F1, F2) disponibles et à attribuer une de ces fréquences disponibles (F1, F2) à chacun des sites de cellule (4110, 4120, 4130), de manière à minimiser le nombre de sites voisins auxquels une même fréquence disponible (F1, F2) est attribuée. En déployant différentes fréquences (F1, F2) dans les sites de cellules (4110, 4120, 4130), on réduit la quantité d'interférences provoquées par les sites voisins, ce qui permet alors d'augmenter la capacité de chaque site (4110, 4120, 4130) fonctionnant selon une seule fréquence (F1 ou F2), pour autant qu'il reste une puissance suffisante pour atteindre les unités mobiles (4200) fonctionnant dans le site (4110, 4120, 4130). Ce système permet d'obtenir des bénéfices maximaux lorsque les sites de cellules (4110, 4120, 4130) sont situés à proximité les uns des autres et que l'exposant de propagation est faible (par exemple 10-20 dB/décade).

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