Variable loop gain in double loop power control systems

H - Electricity – 04 – B

Patent

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H04B 7/005 (2006.01)

Patent

CA 2348542

An apparatus and method for using a variable loop gain in a double-loop power control system to control the power of a forward link signal sent by a gateway to a user terminal to compensate for fading in a wireless communications system. In one embodiment the invention includes the steps of detecting fast fading in the forward link signal and informing the gateway of the fast fading; and at the gateway, reducing the loop gain of the power control loop when fast fading is indicated. In another embodiment, the invention includes the steps of, at the gateway, detecting fast fading in a reverse link signal received from the user terminal and reducing the loop gain of the power control loop when fast fading is indicated.

L'invention concerne un dispositif et un procédé permettant d'utiliser un gain de boucle variable dans un système de régulation de puissance à double boucle. Le dispositif et le procédé permettent de réguler la puissance d'un signal de liaison aval transmis par une passerelle à un terminal utilisateur afin de compenser l'évanouissement dudit signal dans un système de communication sans fil. Dans l'un des modes de réalisation, un évanouissement rapide du signal de la liaison aval est détecté; la passerelle est informée dudit évanouissement; et le gain de la boucle de régulation de puissance est réduit au niveau de la passerelle quand l'évanouissement rapide est indiqué. Dans un autre mode de réalisation, l'évanouissement rapide du signal de la liaison inverse reçu du terminal utilisateur est détecté au niveau de la passerelle; et le gain de la boucle de régulation de puissance est réduit quand l'évanouissement rapide est indiqué.

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