Increasing reliability of hybrid automatic repeat request...

H - Electricity – 04 – L

Patent

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H04L 5/00 (2006.01)

Patent

CA 2723859

In a communication system using HARQ1 the problem of false ACK detection when no ACK/NACK feedback is transmitted is solved sent by varying the reliability of the scheduling information transmitted to the user terminal on a downlink control channel depending on whether the user terminal is expected to use a first or second uplink channel for sending ACK/NACK feedback. When the user terminal is expected to use the first channel to send ACK/NACK feedback, the base station transmits scheduling information to the user terminal with normal reliability. When the user terminal is expected to send ACK/NACK feedback on the second uplink channel, the base station transmits the signaling information to the user terminal with enhanced reliability. The reliability of the signaling information can be increased, for example, by increasing the transmit power on the downlink control channel, increasing the aggregation level, or a combination thereof.

Selon linvention, dans un système de communication utilisant HARQ1, le problème de la détection dun faux ACK lorsquaucune information en retour ACK/NACK na été transmise peut être résolu en faisant varier la fiabilité des informations dordonnancement transmises au terminal de lutilisateur sur un canal de commande en liaison descendante, selon que ledit terminal de lutilisateur utilise un premier ou un second canal en liaison montante pour envoyer lesdites informations en retour ACK/NACK. Si le terminal de lutilisateur envoie les informations en retour ACK/NACK par lintermédiaire du premier canal, la station de base transmet les informations dordonnancement avec une fiabilité normale. Si le terminal de lutilisateur envoie les informations en retour ACK/NACK par lintermédiaire du second canal en liaison montante, la station de base transmet les informations dordonnancement avec une fiabilité optimisée. La fiabilité des informations de signalisation peut être augmentée, par exemple, par augmentation de la puissance de transmission sur le canal de commande en liaison descendante, par augmentation du niveau dagrégation ou par combinaison des deux.

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