UE is capable of establishing an RRC connection in an LTE serving cell of a licensed band in operation 3403. After that, the UE is capable of determining whether it receives a control message enquiring an unlicensed band capability report from the ENB in operation 3405. When the UE receives, from the ENB, a control message enquiring an unlicensed band capability report in operation 3405, it is capable of reporting, to the ENB, a condition as to whether it supports an unlicensed band LTE operation and an unlicensed band LTE duplex mode (TDD or FDD) in operation 3407. For example, the capability report enquiring control message can include a UECapabilityEnquiry message of the RRC layer. The control message can include a UECapabilityInformation message of the RRC layer. The capability report enquiring control message can include a frequency band indicator specifying an unlicensed band, and enquire the UE to repot whether the UE supports an operation mode for the frequency band. One or two frequency band indicators are configured to one unlicensed band. At least one frequency band indicator for the unlicensed band means that a corresponding unlicensed band operates in FDD. At least one or another frequency band indicator for the unlicensed band means that a corresponding unlicensed band operates in TDD. The report control message can include frequency band indicators specifying a duplex mode and an unlicensed band supported by the UE. When the UE supports both FDD and TDD modes for one unlicensed band, the UE is capable of reporting, to the ENB, the report message including the two frequency band indicators for the unlicensed band.