FIG. 4 is a schematic flowchart of a method 400 for transmitting downlink control information according to an implementation of the present application. The method 400 may be implemented by a network device. As shown in FIG. 4, a specific flow for transmitting downlink control information includes acts 410-440.

In 410, a network device determines multiple candidate resource sets for transmitting first control information.

Herein, optionally, the multiple candidate resource sets include at least of: a physical resource set, a sequence resource set and a control channel resource set.

That is, the terminal device may determine multiple candidate physical resource sets for transmitting the first control information, or multiple candidate sequence resource sets for transmitting the first control information, or multiple control channel resource sets for transmitting the first control information.

For example, the physical resource set may be a frequency-domain resource set formed by multiple Physical Resource Blocks (PRBs), and different resource sets occupy different frequency-domain resources. For another example, the first control information or a Demodulation Reference Signal (DMRS) of the first control information may be transmitted through a sequence set, and different sequence resource sets include different sequences. For yet another example, the control channel resource set may be a Control Channel Element (CCE) set, and different control channel resource sets include different CCEs.

Optionally, the multiple candidate sets may occupy multiple frequency-domain resources and/or multiple OFDM symbols.