Multi-beam antenna arrays for base stations in which the...

H - Electricity – 04 – Q

Patent

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H04Q 7/36 (2006.01) H04Q 7/22 (2006.01) H04Q 7/30 (2006.01) H04Q 7/38 (2006.01) H04Q 7/34 (2006.01)

Patent

CA 2258889

Cells in a radio telephone scheme are covered by beam-spots generated by multi- beam antenna system. Forward communication channels follow mobile units as they move between beam-spots. Additionally, each cell is divided into zones based on the mobile traffic patterns within the cell. Typically, there will be a high density zone covered by many, small area beam-spots, a medium density zone covered by two or three medium sized beam-spots, and a low density zone covered by one large beam-spot. As the mobile traffic patterns change throughout the day, multi-beam antenna dynamically reconfigures the zone and beam-spot layout for each cell, thereby keeping a nearly optimal zone and beam- spot configuration despite varying mobile traffic patterns.

Les cellules d'un réseau de radiotéléphones sont couvertes par des empreintes de faisceaux crées par un système d'antennes à faisceaux multiples. Des canaux aller de liaison suivent les unités mobiles dans leurs déplacements entre les empreintes de faisceaux. De plus, chacune des cellules est divisée en zones fonction de la configuration du trafic des mobiles à l'intérieur de la cellule. On se trouve normalement en présence d'une zone de forte densité couverte par plusieurs empreintes de faisceaux de surface réduite, d'une zone de densité moyenne couverte par deux ou trois empreintes de faisceaux de surface moyenne, et d'une zone de densité faible couverte par une empreinte de faisceau étendue. Alors que la configuration du trafic évolue au cours de la journée, l'antenne à faisceaux multiples reconfigure la disposition des zones et des empreintes de faisceaux pour chacune des cellules, de manière à constituer une configuration quasi optimale de zone et d'empreintes de faisceaux en dépit de l'évolution de la répartition du trafic.

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