HARQ/CSI ACK FEEDBACK METHOD OVER UNLICENSED CARRIER

摘要

Systems and methods relating to the use of an unlicensed Component Carrier (CC) for Hybrid Automatic Repeat Request (HARQ) and/or Channel State Information (CSI) feedback for a downlink CC or a downlink CC group are disclosed. In some embodiments, a method of operation of a wireless device in a cellular communications network comprises selecting, from a plurality of uplink CCs configured for the wireless device for HARQ and/or CSI feedback of a downlink CC or a downlink CC group, an uplink CC for HARQ and/or CSI feedback of the downlink CC or the downlink CC group based on channel availability. The method further comprises transmitting HARQ and/or CSI feedback of the downlink CC or the downlink CC group over the uplink CC selected from the plurality of uplink CCs configured for the wireless device.