The invention is used in a communication device comprising time division duplexing system or other radio systems and currently executing a TDD system service. The method comprises: in the TDD radio subframe, presetting an uplink data transmission time slot capable of detecting other radio systems; when the uplink data transmission time slot arrives, looking up other radio systems in said time slot; if finding a radio system, then recording the information relating to said radio system, and then returning to current TDD service; otherwise, directly returning to current TDD service.