Wireless communication method and apparatus for adaptively...

H - Electricity – 04 – L

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H04L 5/16 (2006.01) H04B 15/00 (2006.01)

Patent

CA 2585521

A method and apparatus for adaptively biasing a channel quality indicator (CQI) used for setting a configuration of communication between a transmitter and a receiver in a wireless communication system. The receiver sends a CQI and positive acknowledgement (ACK)/negative acknowledgement (NACK) messages to the transmitter. The ACK/NACK messages indicate the absence or presence of error, respectively, in a transmitted data packet. The CQI is derived from the signal-to-interference ratio (SIR) and the ACK/NACK messages. The transmitter calculates the block error rate (BLER) of the transmitted data packets based upon the ACK/NACK messages sent from the receiver. The transmitter compares the BLER of the transmitted data packets to a target BLER and biases the CQI based on the comparison in order to achieve the target BLER.

L'invention concerne un procédé et un appareil permettant de dériver de manière adaptative un indicateur de qualité de canal (CQI) utilisé pour régler une configuration de communication entre un émetteur et un récepteur dans un système de communication sans fil. Le récepteur envoie un CQI et des messages d'accusé de réception (ACK)/de non-accusé de réception (NACK) à l'émetteur. Les messages ACK/NACK indiquent l'absence ou la présence d'erreur, respectivement, dans un paquet de données transmis. Le CQI est dérivé du rapport signal-brouillage (SIR) et des messages ACK/NACK. L'émetteur calcule le taux d'erreurs sur les blocs (BLER) des paquets de données transmis en fonction des messages ACK/NACK envoyés depuis le récepteur. L'émetteur compare le BLER des paquets de données transmis à un BLER cible et dérive le CQI en fonction de la comparaison afin d'obtenir le BLER cible.

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