METHOD FOR CHANGING MODULATION SCHEME AND BASE STATION APPARATUS USING SAID METHOD

摘要

An EVM measurement unit measures the EVM of received signals, and performs a weighted average on them so as to derive MSE. A frequency acquiring unit acquires the change frequency of modulation scheme and the occurrence frequency of data retransmission. A moving status acquiring unit acquires the variation situation in moving velocity of a terminal apparatus or positional relationship between a base station apparatus and the terminal apparatus. A threshold modifying unit determines the modulation scheme used for the next communication, based on the value of MSE and other pieces of information described above.