Abstract: A user equipment, method used in a user equipment, and an apparatus for a user equipment include receiving from a first cell operated in a licensed band, configuration information configuring a second cell operated in an unlicensed band, performing a listen-before-talk (LBT) procedure on the second cell, counting a number of failures of the LBT procedure on the second cell, and transmitting information based on the number of failures of the LBT procedure on the second cell, to the first cell operated in the licensed band, the information indicating the failure of the LBT procedure on the second cell.

Abstract: User equipment, an apparatus configured to control user equipment, and a method. The method may include receiving by a user equipment from a base station, a synchronization signal and a master information block, the master information block transmitted at a same transmission cycle as a transmission cycle of the synchronization signal. The method may further include receiving by the user equipment from the base station, first information indicating time domain positions at which the synchronization signal and the master information block are to be transmitted. In addition, the method may include receiving by the user equipment from the base station, second information indicating a periodicity of transmission of the synchronization signal and the master information block. The periodicity indicated by the second information may be different from 40 ms.

Abstract: A radio terminal according to one embodiment comprises a controller configured to transmit a physical uplink shared channel to a base station by an interlace mapping using a plurality of resource blocks distributed on a frequency axis while overlapping on a time axis. The controller receives, from the base station, control channel information on a time-frequency resource used for transmitting the physical uplink control channel. The controller stops transmission in a specific resource block corresponding to the time-frequency resource from among the plurality of resource blocks, based on the control channel information.

Abstract: A mobile communication system according to one embodiment comprises: a base station configured to transmit discovery reference signal in an unlicensed spectrum, and a radio terminal configured to receive the discovery reference signal in the unlicensed spectrum. The base station notifies the radio terminal of timing information indicating a timing at which the discovery reference signal is to be transmitted in the unlicensed spectrum.

Abstract: A user equipment, apparatus provided in a user equipment, and method are for receiving a Multicast Broadcast Service, and include receiving a system information block (SIB) from a current serving cell of the user equipment, and performing a cell reselection operation where a cell having a highest ranking determined based on a radio quality and an offset is selected as a serving cell of the user equipment from among a plurality of cells. In the cell reselection operation, a determination is made, based on the SIB, whether to use an infinite offset as the offset to be applied to a cell providing the Multicast Broadcast Service.

Abstract: A mobile communication method for performing predetermined communication between a base station and a user terminal by using a narrow band including 6 resource blocks comprises: transmitting, from the base station to the user terminal, narrow band allocation information allocating a predetermined number of the narrow bands to the user terminal as allocation information of the narrow band used for the predetermined communication; performing by the user terminal, the predetermined communication by using the predetermined number of narrow bands based on the narrow band allocation information; transmitting, from the base station to the user terminal, an RRC message including information specifying a bandwidth supportable by the user terminal; and changing, by the base station, a number of bits of the narrow band allocation information according to the bandwidth supportable by the user terminal. The predetermined number of narrow bands are provided within a bandwidth supportable by the user terminal.

Abstract: A communication control method according to one embodiment is used in a mobile communication system. The communication control method comprises a step A of predicting, by a UE, a radio condition within a second period after connection between the UE and a eNB is established, in a first period for which the connection is not established, and a step B of performing, by the UE, a random access procedure for establishing the connection. The step B includes a step of performing notification of information on the predicted radio condition from the UE to the eNB in the random access procedure. The information is used, by the eNB, for controlling communication with the UE.

Abstract: A radio communication apparatus according to a first embodiment comprises a controller. The controller is configured to specify a first time period in which communication with a network is restricted, and perform control in the first time period to restrict the communication with the network.

Abstract: A user equipment, method used in user equipment, and apparatus for controlling a user equipment operate to receiving a connected mode DRX parameter configured by a base station, and transmit to the base station a message including information indicating a connected mode DRX parameter preferred by the user equipment. The connected mode DRX parameter preferred by the user equipment includes at least one of DRX-InactivityTimer, DRX-ShortCycle, and DRX-ShortCycleTimer.

Abstract: A user equipment, an apparatus for controlling user equipment, and a method receive measurement configuration information from a first cell, the measurement configuration information indicating a subcarrier spacing applied to a second cell, and perform measurement on the second cell based on the measurement configuration information.

Abstract: A user equipment, method used in a user equipment, and an apparatus for a user equipment include receiving from a first cell operated in a licensed band, configuration information configuring a second cell operated in an unlicensed band, performing a listen-before-talk (LBT) procedure on the second cell, counting a number of failures of the LBT procedure on the second cell, and transmitting information based on the number of failures of the LBT procedure on the second cell, to the first cell operated in the licensed band, the information indicating the failure of the LBT procedure on the second cell.

Abstract: A user terminal, method used in a user terminal, and an apparatus for a user terminal include receiving from a base station measurement configuration information configuring measurement of a frequency channel in an unlicensed band, measuring signal strength of radio signals transmitted in the frequency channel, determining occupancy situation of the frequency channel based on the measured signal strength and a threshold, and transmitting to the base station a measurement report including information indicating the occupancy situation of the frequency channel.

Abstract: A user equipment, method and apparatus receive a PDSCH from a base station and determine a modulation order used in the PDSCH based on whether the PDSCH is transmitted in a second slot out of a first slot and the second slot which configure a subframe.

Abstract: A communication method according to one embodiment comprises: transmitting, by a base station that manages a Licensed-Assisted Access (LAA) cell, downlink control information (DCI) to a user equipment, the DCI including subframe information and a transmission instruction of a sounding reference signal in the LAA cell, the subframe information indicates a specific subframe in which the user equipment should transmit the sounding reference signal; and transmitting, by the user equipment, the sounding reference signal to the base station in the specific subframe, based on the DCI.

Abstract: A base station performs radio communication with a radio terminal using at least one narrow frequency band where the number of resource blocks is limited to a predetermined resource block number. The base station comprises a transmitter configured to transmit, to the radio terminal, configuration information for frequency hopping where the radio communication is performed while switching the narrow frequency band; and a controller configured to allocate, to the radio terminal, a first frequency band of the frequency hopping and a frequency band of a hopping destination. The first frequency band and the frequency band of the hopping destination respectively include the narrow frequency band and fraction resource blocks. The fraction resource blocks are resource blocks, the number of which is smaller than the predetermined resource block number.

Abstract: A base station (200) according to one embodiment uses a specific frequency band shared by a plurality of operators and/or a plurality of communication systems. The base transmit, to a radio terminal (100-1), interference-related information relating to interference detected by the base station in the specific frequency band.

Abstract: A user equipment, apparatus provided in a user equipment, and method are for receiving a Multicast Broadcast Service, and include receiving a system information block (SIB) from a current serving cell of the user equipment, and performing a cell reselection operation where a cell having a highest ranking determined based on a radio quality and an offset is selected as a serving cell of the user equipment from among a plurality of cells. In the cell reselection operation, a determination is made, based on the SIB, whether to use an infinite offset as the offset to be applied to a cell providing the Multicast Broadcast Service.

Abstract: A mobile communication method according to an embodiment includes a step in which a base station configured to perform communication by using a narrow band which is a second bandwidth narrower than a first bandwidth compatible with a first user terminal in one unit time transmits information for allocating a second user terminal an extended band having a third bandwidth wider than the second bandwidth and narrower than the first bandwidth in the one unit time.

Abstract: A user equipment according to an embodiment comprises a processor and a memory coupled to the processor. The processor is configured to receive a first control information from a base station, the first control information designating a first time region on which a first Hybrid Automatic Repeat Request-Acknowledgement (HARQ-ACK) to be transmitted, the first HARQ-ACK corresponding to a first data transmitted on a first Physical Downlink Shared Channel (PDSCH) in which a transmission time interval is shorten than one subframe, the first time region being shorten than one subframe. The processor is configured to attempt to receive a second data transmitted on a second PDSCH in which a transmission time interval is one subframe. The processor is configured to transmit a second HARQ-ACK corresponding to the second data on the first time region.

Abstract: A base station according to one embodiment may comprise a receiver configured to receive first information from a radio terminal, the first information being transmitted based on a measurement result of a reception signal from a neighbouring cell; and a transmitter configured to transmit second information for reducing a transmission power of the radio terminal to the radio terminal when the measurement result of the reception signal from the radio terminal exceeds a threshold value.