Methods, apparatus and systems for determining a power headroom for an uplink transmission are disclosed. In one embodiment, a method performed by a wireless communication device is disclosed. The method comprises: determining a configuration of at least one power control parameter from a plurality of candidate configurations; determining, based on the configuration of the at least one power control parameter, a power headroom report (PHR) associated with an uplink transmission from the wireless communication device to a wireless communication node; and generating a power headroom report (PHR) medium access control (MAC) control element (CE) for reporting the PHR to the wireless communication node.