The present disclosure provides a control channel monitoring method at a UE, comprising: monitoring only a first type of control channel in a first state of the UE; if first control information which indicates data required by the UE in the first state on a data channel is detected on the first type of control channel, decoding the first control information in order to obtain the data required by the UE in the first state on the data channel; and monitoring only a second type of control channel when the UE is in a second state which is transited from the first state. The present disclosure also provides a corresponding UE, a control channel configuration and transmission method at a network node, and a corresponding network node.