Tailored base station power levels at handoff and call setup

Details Tailored base station power levels at handoff and call setup Tailored base station power levels at handoff and call setup

H - Electricity

04

W

H04W 52/38 (2009.01) H04W 52/06 (2009.01) H04W 36/30 (2009.01)

Patent

CA 2371299

Methods and apparatus for controlling the inital transmit power from a base station to a mobile station at call set-up and call handoff. The initial transmit power from a base station during a call set-up can be reduced from the conventional full power level by a sum of the hysteresis value for the cell which is handing off the mobile station and the hysteresis value for the cell which is receiving the mobile station. When the mobile station initiates or receives a call, the initial tranmsit power from a base station to the mobile station is reduced from the full power level by the hysteresis value for the hysteresis zone which surrounds the cell in which call set-up is to occur. The reduction in the initial power levels reduces interference caused to surrounding cells at the initiation of a call set-up or call handoff.

L'invention concerne des procédés et appareil permettant de régler la puissance d'émission initiale d'une station de base vers une station mobile à l'établissement d'une communication et au transfert d'appel. On peut déduire, du niveau de puissance maximale classique, la puissance d'émission initiale d'une station de base pendant un établissement de communications de la somme des valeurs de l'hystérésis pour la cellule qui transfère la station mobile et de l'hystérésis pour celle qui reçoit la station mobile. Lorsque la station mobile lance ou reçoit un appel, la puissance d'émission initiale d'une station de base vers la station mobile est déduite, du niveau de puissance maximale, de la valeur de l'hytérésis pour la zone de l'hystérésis qui entoure la cellule dans laquelle l'établissement de communications doit avoir lieu. La réduction des niveaux de puissance initiale diminue les interférences occasionnées aux cellules voisines au lancement d'un établissement de communications ou d'un transfert d'appel.

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