Arq system with status and packet acknowledgement

Details Arq system with status and packet acknowledgement Arq system with status and packet acknowledgement

H - Electricity

04

L

H04L 1/18 (2006.01) H04L 1/16 (2006.01) H04L 1/12 (2006.01)

Patent

CA 2495074

A communication system comprises a downlink indicator channel (DL1) for the transmission of a indicator signal (302) indicating that a data packet (202) is scheduled to be transmitted on a downlink data channel (DL2) from a primary station to a secondary station. In operation, on detection of the indicator signal, the secondary station transmits a status signal, for example a negative acknowledgement signal (204), on an uplink channel (UL) to the primary station immediately before transmission of a positive (206) or negative acknowledgement signal to indicate the status of the received data packet. By providing the primary station with two chances to detect the case where the secondary station fails to detect the indicator signal, peak power requirements of the uplink channel can be reduced, thereby reducing system interference levels.

Système de communication comprenant une voie descendante (DL¿1?) servant à transmettre un signal d'indication (302) indiquant qu'un paquet de données (202) est programmé pour transmission sur une voie de données descendante (DL¿2?) d'une station primaire à une station secondaire. Pendant l'opération, à la détection du signal d'indication, cette station secondaire émet un signal d'état, par exemple, un signal d'accusé de réception négatif (204), sur une voie ascendante (UL) en direction de la station primaire immédiatement avant l'émission d'un signal d'accusé réception positif (206) ou négatif afin d'indiquer l'état du paquet de données reçu. Etant donné que la station primaire possède ainsi deux possibilités de détection de l'échec éventuel de la détection du signal d'indication par la station secondaire, il est possible de limiter la puissance maximum requise de la voie ascendante, ce qui permet de diminuer les niveaux d'interférence du système.

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