Sequence numbering range extending method and system for...

H - Electricity – 04 – L

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H04L 1/18 (2006.01)

Patent

CA 2292496

A method and system for transmitting digital data by extending the sequence numbering range for a selective repeat transmission protocol are described. In accordance with one embodiment of the invention, data frames (70) are transmitted including an eight-bit sequence number (72) and a one-bit retransmit flag (74). The one-bit retransmit flag (74) indicates whether the frame is newly transmitted or retransmitted due to a failed first transmission. Transmit (50) and receive (52) systems each maintain a twelve-bit sequence number referred to as a "long sequence number" comprised of the eight-bit sequence number transmitted with each frame and a four-bit extension. The long sequence number is transmitted within a control frame (82) and the eight-bit sequence number is transmitted within the data frame (72).

L'invention concerne un système et un procédé de transmission de données numériques par extension de la plage de numéros d'ordre pour un protocole à répétition sélective de transmission. Dans un mode de réalisation de cette invention, les trames de données (70) sont transmises avec un numéro d'ordre huit bits (72), et un drapeau de retransmission un bit (74). Ce drapeau de retransmission un bit (74) indique si la trame est transmise pour la première fois, ou retransmise suite à un échec de sa première transmission. Des systèmes de transmission (50) et de réception (52) gèrent un numéro d'ordre douze bits, ci-après dénommé "numéro d'ordre long", ce numéro étant constitué du numéro d'ordre huit bits, transmis avec chaque trame, et d'une extension quatre bits. Ce numéro d'ordre long est transmis dans une trame de service (82), le numéro d'ordre huit bits étant transmis dans ladite trame de données (72).

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