Method and system for improving handoffs in cellular mobile...

H - Electricity – 04 – W

Patent

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H04W 36/30 (2009.01) H04W 88/12 (2009.01)

Patent

CA 2315100

A method (300) and system (200, 400) are disclosed for making inter-cell handoffs to a cell of a base station (BS2, BS3) including a directional antenna array (401, 413). The handoff algorithm (309) includes taking into account uplink direction of arrival measurements (305) in at least one candidate target base station, made on signals from the mobile radio terminal (203, 417) to its serving base station (BS1), and directly after handoff using a directional narrow lobe from the antenna array. The narrow lobe can be used immediately after the handoff (313) in the radio base stations (BS2, BS3) that have antenna arrays (401, 413), by including the direction (of arrival information) to the mobile radio terminal (203, 417) in the handoff order (311) to the target base station. Also disclosed are a method and system for measuring uplink interference on idle narrow lobe traffic channels (307), and using this information when selecting at handoff a target base station and traffic channel (309).

L'invention concerne un procédé (300) et un système (200, 400) permettant d'exécuter des transferts intercellulaires vers une cellule d'une station de base (BS2, BS3) comportant un réseau d'antennes directionnelles (401, 413). L'algorithme de transfert (309) tient compte de la direction des paramètres de réception (305) de signaux de liaison ascendante, mesurés dans au moins une station de base cible candidate, ces signaux étant envoyés par le terminal radio mobile (203, 417) à sa station de base de desserte (BS1). L'algorithme tient également compte, juste après le transfert, de l'utilisation d'un lobe étroit directionnel du réseau d'antennes. En effet, le lobe étroit peut être utilisé juste après le transfert (313) dans les stations de base radio (BS2, BS3) ayant des réseaux d'antennes (401, 413) par inclusion de la direction des informations de réception destinées au terminal radio mobile (203, 417) dans la commande de transfert (311) vers la station de base cible. L'invention concerne également un procédé et un système permettant de mesurer les interférences ascendantes sur des canaux de trafic à lobe étroit (307) disponibles et d'utiliser cette information lors de la sélection au niveau du transfert une station de base cible et un canal de trafic (309).

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