Method for transmitting ACK/NACK messages

The invention provides a method for transmitting ACK/NACK messages. As for each ACK/NACK message in multiple ACK/NACK messages corresponding to uplink transmission of multiple user equipment, a base station determines index position of the ACK/NACK message in downlink control information and puts the ACK/NACK message at the index position. Then, the ACK/NACK message is coded by the use of orthogonal sequence and repetition coding. Finally, the base station sends the downlink control information to the multiple user equipment. By the method provided by the invention, overhead of the ACK/NACK corresponding to the uplink transmission can flexibly be controlled and optimized, and the balance between flexibility of resource allocation and robustness of ACK/NACK transmission is realized. In addition, the method has little influence on existing standards and a current system and has good compatibility, and the method also can be applied in a scene of NCT lacking PHICH.