ACKNOWLEDGEMENT/NEGATIVE-ACKNOWLEDGEMENT SYMBOL TRANSMISSION METHOD IN A CARRIER AGGREGATION ENVIRONMENT CAPABLE OF EFFECTIVELY TRANSMITTING AN ACKNOWLEDGEMENT/NEGATIVE-ACKNOWLEDGEMENT SYMBOL WITH RESPECT TO DOWNLINK DATA

摘要

PURPOSE: An ACK/NACK(ACKnowledgement/Negative-ACKnowledgement) symbol transmission method in a carrier aggregation environment is provided to improve the channel estimation performance of a base station by estimating a channel in two time ranges.;CONSTITUTION: The travel speed of a terminal is estimated(210). The terminal transmits the estimated travel speed to a base station(220). The terminal receives information with respect to an orthogonal code from the base station(230). The terminal receives a coding rate with respect to an ACK/NACK(ACKnowledgement/Negative-ACKnowledgement) symbol from the base station(240). The terminal performs channel coding with respect to the ACK/NACK symbol(250). The terminal multiplies the orthogonal code to the ACK/NACK symbol with respect to downlink data(260). The terminal inserts the ACK/NACK symbol in a consecutive position of an uplink sub frame(270). The terminal transmits a generated sub frame to the base station(280).;COPYRIGHT KIPO 2012