In this embodiment of the present invention, a control circuit and an antenna that has transmitting and receiving functions may be considered as a transceiver unit 101 of the terminal device 1000, for example, configured to support the terminal device in performing the transmitting and receiving functions performed by the terminal device in the method embodiments shown in FIG. 2 to FIG. 8. A processor having a processing function is considered as a processing unit 102 of the terminal device 1000, and corresponds to the processing unit 910 in FIG. 9. As shown in FIG. 10, the terminal device 1000 includes the transceiver unit 101 and the processing unit 102. The transceiver unit may also be referred to as a transceiver, a transceiver machine, a transceiver apparatus, or the like. The transceiver unit corresponds to the transceiver unit 920 in FIG. 9. Optionally, a device configured to implement the receiving function in the transceiver unit 101 may be considered as a receiving unit, and a device configured to implement the sending function in the transceiver unit 101 may be considered as a sending unit. In other words, the transceiver unit 101 includes the receiving unit and the sending unit. The receiving unit may also be referred to as a receiver, an input port, a receiver circuit, or the like. The sending unit may be referred to as a transmitter machine, a transmitter, a transmitter circuit, or the like. It may be understood that the transceiver unit may also be an interface circuit.
