Method and apparatus for transmitting control channel

User equipment for receiving a downlink control channel, comprising:

• a receiving unit, configured to receive a candidate time-frequency resource group in which a first RS time-frequency resource corresponding to a first RS is located, wherein the downlink control channel comprises a first downlink control channel and a second downlink control channel, and the first downlink control channel comprises the first RS and first DCI;
• and
• a processing unit, configured to:
• determine the first RS time-frequency resource based on the candidate time-frequency resource group;
• determine a first DCI time-frequency resource corresponding to the first DCI based on the first RS time-frequency resource;
• detect the first RS on the first RS time-frequency resource, and demodulate the first DCI on the first DCI time-frequency resource by using the first RS;
• and
• determine a second time-frequency resource corresponding to the second downlink control channel based on the first DCI.

A base station for sending a downlink control channel, comprising:

• a processing unit, configured to indicate, on a first downlink control channel by using a first RS, a time-frequency resource corresponding to first DCI, wherein the first downlink control channel is comprised in the downlink control channel, and the first downlink control channel comprises the first RS and the first DCI;
• and
• a sending unit, configured to send the first downlink control channel, wherein
• the processing unit is further configured to determine that a second time-frequency resource corresponding to a second downlink control channel is indicated by using the first DCI;
• and
• the sending unit is further configured to send the second downlink control channel.