A base station device and a data communication method. The base station device comprises: a receiving unit which receives channel state information containing a CQI index from a terminal device; a high-level link unit which generates a high-level signalling sending signal and sends same to the terminal device, and designates whether the terminal device uses a basic CQI mapping table or an extended CQI mapping table in the high-level signalling sending signal, the extended CQI mapping table specifying the correlation between the CQI index and an extended modulation manner and a code rate, and the extended modulation manner comprising a high-order modulation manner with a higher order of modulation; an information collection unit which maps the CQI index into information about the signal to interference plus noise ratio according to the designated CQI mapping table; a scheduling unit which conducts channel resource allocation on the terminal device according to the mapped information about the signal to interference plus noise ratio and selects a modulation and coding scheme; and a sending unit which generates a downlink transmission signal according to a scheduling result and sends same to the terminal device.
展开▼
