Outer-loop power control for wireless communication systems

H - Electricity – 04 – W

Patent

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Details

H04W 52/04 (2009.01) H04W 52/16 (2009.01) H04W 52/20 (2009.01)

Patent

CA 2516231

Systems and methods for controlling power in a wireless communication system having multiple reverse-link channels. One embodiment comprises adjusting power levels of a first set of channels and a corresponding pilot channel while maintaining a set traffic-to-pilot (T/P) ratio between them, and adjusting T/P ratios for one or more remaining channels independently of the power level of the pilot channel. A base station determines whether frames received on the first set of channels contain errors and sends messages to a mobile station to increment or decrement the power levels, respectively, if the frames do or do not contain errors. T/P ratios of the additional channels are adjusted by determining whether frames received on the additional channels contain errors, incrementing or decrementing the T/P ratios appropriately, and transmitting the T/P ratios to the mobile station, which controls the transmission parameters for the respective channels in accordance with the received T/P ratios.

L'invention concerne des systèmes et des procédés permettant de maîtriser une puissance dans un système de communication sans fil ayant plusieurs canaux de liaison retour. Dans un mode de réalisation, l'invention concerne le réglage des niveaux de puissance d'un premier ensemble de canaux et d'un canal pilote correspondant, avec maintien d'un rapport trafic/pilote (T/P) fixe entre eux, et réglage des rapports T/P pour un ou plusieurs canaux restants, indépendamment du niveau de puissance du canal pilote. Une station de base détermine si les trames reçues sur le premier ensemble de canaux contiennent des erreurs et envoie des messages à une station mobile pour incrémenter ou décrémenter les niveaux de puissance respectivement, dans les cas où les trames contiennent ou ne contiennent pas des erreurs. On règle les rapports T/P des canaux additionnels en déterminant si les trames reçues sur ces canaux additionnels contiennent des erreurs, en incrémentant ou en décrémentant les rapports T/P de manière appropriée, et en transmettant les rapports T/P à la station mobile, qui commande les paramètres d'émission des canaux correspondants conformément aux rapports T/P reçus.

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