Methods and apparatus related to HARQ feedback, e.g. delayed HARQ ACK/NACK, and uplink control information (UCI) multiplexing, in unlicensed spectrum are described. A base station transmits an UCI request to a UE, including: a request for ACK/NACK feedback corresponding to a set of HARQ identified processes, a request for channel state information report, and/or a scheduling request. The UCI request includes information which is used, by the UE, in determining the time and air link resources on which to send the UCI. The HARQ processes are communicated in a first Channel Occupancy Time (COT), while the ACK/NACK feedback is communicated in a later COT.