The present disclosure relates to a radio link monitoring in wireless communications. According to an embodiment of the present disclosure, a method performed by a user equipment (UE) in a wireless communication system comprises: receiving, from a network, configuration information comprising a first condition for detecting a failure on a cell group; determining a second condition for detecting the failure on the cell group based on the first condition and a state of the cell group - the state of the cell group comprises at least one of a first state or a second state; performing a link monitoring (LM) on the cell group based on the first condition while the cell group is in the first state; and performing a LM on the cell group based on the second condition while the cell group is in the second state. The first state may be a state in which the UE monitors a first set of resources for a control channel on the cell group. The second state may be a state in which the UE monitors a second set of resources for a control channel on the cell group, or does not monitor a control channel on the cell group. The second condition may be related to a more relaxed condition for detecting the failure on the cell group than the first condition.