Determination method, base station and communication system for modulation and coding scheme

The invention provides a determination method, base station and communication system for a modulation and coding scheme. The method comprises the steps that the order of the modulation and coding scheme is obtained; according to the order of the modulation and coding scheme and the size of an allocated resource block, a modulation order and the size of a transmission block are obtained; in primary circulation, according to the size of the allocated resource block, the modulation order and the size of the transmission block, a code rate is calculated; if the code rate is smaller than or equal to the preset maximum code rate, the modulation and coding scheme is determined to be the scheme comprising a modulation system corresponding to the modulation order and the size of the transmission block; if the code rate is larger than the preset maximum code rate, and the modulation order is smaller than the preset maximum modulation order, the modulation order is increased, the modulation order is updated to be the increased modulation order, and the next circulation is performed. According to the determination method, base station and communication system for the modulation and coding scheme, the average speed of the communication system can be effectively increased.