Method and apparatus for determining the closed loop power...

H - Electricity – 04 – B

Patent

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H04B 7/005 (2006.01)

Patent

CA 2380005

The present invention is a novel and improved method and apparatus for performing closed loop power control. A method of implementing reverse link outer loop using only pilot signal is described. Such a method is especially useful when the data signals are only present in short burst such that packet or frame error rates (PER or FER) cannot be estimated accurately. Moreover, since this method provides a mechanism for accurate set point adjustment even without a PER (FER) estimate, it can also be used to improve the accuracy of outer loop performance when such estimate becomes available. The present invention estimates a "pilot bit error rate" (PBER) (200), where each pilot "bit" consists of a number pilot chips distributed over a frame. In addition, it estimates the normalized variance of the signal energy (or C/I) (202) for each packet.

L'invention concerne de nouveaux procédé et appareil améliorés permettant d'exécuter une commande de puissance en boucle fermée. Elle concerne également la mise en oeuvre d'une boucle extérieure de liaison de retour à l'aide d'un seul signal pilote. Ce procédé est particulièrement utile lorsque les signaux de données sont présents uniquement dans une courte rafale, ce qui ne permet pas de calculer précisément le taux d'erreurs de trames ou de paquets (PER ou FER). En outre, du fait que ce procédé fournit un mécanisme permettant de calculer, de manière précise, un point de consigne même sans estimer un PER (FER), on peut l'utiliser pour améliorer la précision de la performance de la boucle extérieure lorsque cette estimation est disponible. Cette invention permet de calculer le taux d'erreurs de bit pilote (PBER) (200), chaque bit pilote comprenant un certain nombre d'éléments pilotes répartis sur une trame. Elle permet également de calculer la variance normalisée de l'énergie du signal (ou C/I) (202) pour chaque paquet.

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