The present application provides a system and apparatus, a base station transmits downlink data, and a user equipment detects the downlink data in at least two consecutive downlink sub-frames, joint encodes feedback signals responding to the downlink data in the at least two consecutive downlink sub-frames to obtain joint uplink feedback information, and transmits, in an uplink sub-frame used for transmitting feedback information for one of the at least two consecutive downlink sub-frames, the joint uplink feedback information for the at least two consecutive downlink sub-frames to the base station, where length of the uplink sub-frame used for transmitting the feedback information is N multiplied by length of one downlink sub-frame in the at least two consecutive downlink sub-frames, wherein N is an integer greater than 2, so as to resolve issue how uplink feedback is performed when downlink bandwidth is different from uplink bandwidth.