With reference to the second possible implementation manner of the fifth aspect, in a third possible implementation manner of the fifth aspect, the first measuring module is further configured to, after the processing module performs service transmission according to the instruction information, continue to measure the common pilot channel quality of the micro base station; when the common pilot channel quality of the micro base station is greater than the first condition threshold value for addition to the second active set, the first sending module is further configured to send a second measurement report to the RNC, so that the RNC sends first control information to the UE; and the processing module is further configured to add the micro base station to the second active set according to the first control information; or the first measuring module is further configured to, after the processing module performs service transmission according to the instruction information, continue to measure the common pilot channel quality of the micro base station; when the common pilot channel quality of the micro base station is less than the second threshold value, the first sending module is further configured to send a second measurement report to the RNC, so that the RNC sends second control information to the UE; and the processing module is further configured to remove the micro base station from the first active set according to the second control information.