A method and an apparatus for a quick retransmission of...

H - Electricity – 04 – L

Patent

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H04L 1/18 (2006.01) H04L 1/16 (2006.01)

Patent

CA 2406216

A transmitting terminal, transmits signals in a form of packets to a receiving terminal, if the packet was intended for the receiving terminal, if so, the receiving terminal demodulates the packet. The receiving terminal then computes a quality metric of the packet, and compares the computed quality metric with a quality metric contained in the packet. If the quality metrics match, the packet is forwarded for further processing. If the quality metrics fail to match, the receiving terminal sends a request for retransmission of the packet. The transmitting terminal determines which packet needs to be retransmitted based on the request for retransmission. If delivery of the packet in accordance with the aforementioned description fails, retransmission in accordance with conventional sequence-number-based schemes, e.g., radio link protocol, is attempted.

L'invention concerne un terminal de transmission transmettant des signaux sous forme de paquets à un terminal de réception. Si le paquet est destiné au terminal de réception, celui-ci démodule le paquet. Le terminal de réception calcule alors une mesure de qualité du paquet et compare la mesure de qualité calculée avec une mesure de qualité contenue dans le paquet. Si les mesures de qualité correspondent, le paquet est retransmis pour un autre traitement. Si les mesures de qualité ne correspondent pas, le terminal de réception envoie une demande de retransmission du paquet. Le terminal de transmission détermine quel paquet doit être retransmis suite à la demande de retransmission. Si la livraison du paquet selon le système mentionné ci-dessus échoue, on procède alors à une tentative de retransmission selon des systèmes conventionnels basés sur des numéros de séquence, par exemple un protocole de liaison radio.

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