Base station-side and user equipment-side apparatuses and methods, and a wireless communication system, for use in wireless communication. The base station-side apparatus for use in wireless communication includes: a setting unit, configured to set different priority levels for using uplink transmission resources on unauthorized band with respect to a plurality of user equipment; and a generating unit, configured to generate an uplink scheduling authorization for using one same uplink transmission resource on the unauthorized band with respect to each user equipment, wherein each uplink scheduling authorization includes information about a priority level of the corresponding user equipment.