In addition, it should be noted that the uppercase letters and lowercase letters in the embodiments of the present application indicate different meanings, respectively. For example, the uppercase “K” represents the number of control resource subsets included in the first control resource set, the lowercase “k” represents a k-th control resource subset of the K control resource subsets, and the value of k is from 0 to K?1.

FIG. 14 is a schematic structural diagram of the network device according to the present application. As shown in FIG. 14, the network device 140 includes:

• • a processing module 141, configured to map a first control channel to S first transmission units included in a first control resource set, where the first control resource set is a control resource set on a first bandwidth part BWP, the first BWP includes N subbands, the first control resource set is located on at least one subband of the N subbands, and the first transmission unit is a smallest unit configured to transmit a control channel, where S and N are positive integers, S≥1 and N≥2;
  • a transmitting module 142, configured to transmit the first control channel to a terminal device.

The network device provided in this embodiment is used to implement the technical solution on the network device side in any of the foregoing method embodiments, and its implementation principles and technical effects are similar, and will not be repeated here.