FIELD: information technology.SUBSTANCE: problem of false ACK detection when no ACK/NACK signal is transmitted by a user terminal is solved 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. If 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. If the user terminal is expected to send ACK/NACK feedback on the second uplink channel, the base station transmits the signalling information with high reliability. The reliability of the signalling information can be increased, for example, by increasing the transmission power on the downlink control channel, increasing the aggregation level, or a combination thereof.EFFECT: reduced probability of false ACK detection.14 cl, 3 dwg
INCREASING RELIABILITY OF HYBRID AUTOMATIC REPEAT REQUEST PROTOCOL