Patent ID: 7050761

Claim:
A mobile communication system for transmitting data, in a unit of a block of data, in any one of a plurality of transmission modes, said system comprising: a base station; a base station control apparatus for controlling said base station; a mobile station comprising a detecting unit for detecting a receiving error in a unit of a block of data during the data transmission; switching selecting means for switching the transmission mode, based on the detection of the receiving error, wherein said switching selecting means is configured to switch the transmission mode to a first slow mode, which is slower than a current mode, when the block error rate in a first predetermined number of blocks is larger than a first predetermined block error rate, to switch the transmission mode to a fast mode, which is faster than the current mode, when the block error rate in a second predetermined number of blocks is smaller than a second predetermined block error rate, and to switch the transmission mode to a second slow mode, slower than the current mode, when the block error rate in the second predetermined number of blocks is equal to or larger than a third predetermined block error rate, where the second predetermined number of blocks is greater than the first predetermined number of blocks.