Method and apparatus for minimising total transmission...

H - Electricity – 04 – B

Patent

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Details

H04B 7/005 (2006.01) H04L 1/18 (2006.01)

Patent

CA 2386735

Method and apparatus for transmitting a signal at a predetermined level of reliability using retransmission of erroneously transmitted frames so as to minimize total transmission energy. The transmitting station evaluates the frame error rate (FER) as a function of energy. Next, the transmitting station determines a combination of initial transmission energies and retransmission energies that will provide the target level of reliability while minimizing the total transmission energy employed in the initial transmission and the retransmissions. The transmitting station transmits a frame with an initial transmission energy. Employing conventional feedback methods the transmitting station is alerted to the occurrence of frame errors at the receiving station. The transmitting station upon notification of a frame error retransmits the frame with an energy determined to minimize the total energy required to transmit the frame with a predetermined level of reliability.

L'invention concerne un procédé et un appareil permettant de transmettre un signal à un niveau de fiabilité prédéterminé, par retransmission de trames transmises par erreur afin de réduire l'énergie de transmission totale. La station de transmission calcule le taux d'erreurs de trame comme une fonction de l'énergie. Puis, la station de transmission détermine une combinaison d'énergies de transmission de départ et d'énergies de transmission qui permettra de fournir le niveau de fiabilité ciblé tout en réduisant l'énergie de transmission totale utilisée pour la transmission de départ et pour les retransmissions. La station de transmission transmet une trame à l'aide d'une énergie de transmission de départ. Grâce à des procédés classiques de rétroaction, la station de transmission est alertée de la présence d'erreurs de trame à la station réceptrice. Lorsqu'elle est avertie d'une erreur de trame, la station de transmission retransmet la trame à l'aide d'une énergie déterminée de manière à réduire l'énergie totale nécessaire pour transmettre cette trame à un niveau de fiabilité prédéterminé.

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