BASE STATION APPARATUS AND DATA MAPPING METHOD

摘要

When a plurality of user terminal devices have different receiving qualities, data transmission efficiency to each user terminal device can be improved. A pair determination unit (101) determines pairs by combining every two of the user terminal devices having a large SNR difference. A selection unit (104) assigns to each of the pair of user terminal devices a hierarchical modulation channel corresponding to each SNR. In this case, the selection unit (104) assigns the hierarchical modulation channel having a high hierarchy to the user terminal device having a low SNR and the hierarchical modulation channel having a low hierarchy to the user terminal device having a high SNR. A hierarchical modulation unit (107) maps the user data of each user terminal device onto the hierarchical modulation channel corresponding to the each user terminal device.