| 摘要 |
<P>PROBLEM TO BE SOLVED: To attain improvement in transmission efficiency and reception quality of delivery acknowledgement information (PHICH) indicating whether retransmission of an uplink signal is required or not. <P>SOLUTION: A base station device includes a means for preparing PHICH, a means for mapping each of PHICH items as many as user multiplexes to an I or Q channel in accordance with a predetermined mapping table; and a means for notifying every user of the PHICH. A user device comprises: a means for demodulating a downlink control sinal including allocation information of uplink radio resources; a means for transmitting a shared data channel on uplink in accordance with the allocation information; and a means for extracting the PHICH, indicating whether retransmission of the shared data channel is required or not, from the downlink control signal in accordance with the predetermined mapping table. The mapping table indicates that the PHICH is to be made corresponding only to the I or Q channel when the number of user multiplexes is less than or equal to a predetermined number, or indicates that the PHICH is to be made corresponding to the I and Q channels when the number of user multiplexes is more than the predetermined number. <P>COPYRIGHT: (C)2009,JPO&INPIT |
