Abstract:
A user terminal according to a first feature performs uplink communication with a radio access network by simultaneously using a plurality of carriers. The plurality of carriers include a first carrier used for mobility control of the user terminal, and a second carrier that provides radio communication in coordination with the first carrier. The first carrier includes a first physical uplink control channel region provided at each of both end portions in a frequency direction of the first carrier. The second carrier includes a second physical uplink control channel region provided at a center frequency side of the second carrier away from each of both end portions in a frequency direction of the second carrier.
Abstract:
A base station comprises: a controller configured to control, in a case another base station performs efficient operation by which a part of functions regarding communication with a user terminal is stopped, so that the part of functions is performed in the base station, in place of in the other base station, while the base station utilizes a radio unit and an antenna unit of the other base station.
Abstract:
A UE 100-1 and a UE 200-2 perform D2D communication that is direct device to device communication. The UE 100-1 transmits a D2D termination preliminary notification indicating that termination of the D2D communication is wished to the UE 100-2 during the D2D communication. The UE 100-1 terminates the D2D communication after transmitting the D2D termination preliminary notification.
Abstract:
A communication control method applied to a mobile communication system including a user terminal capable of storing an MDT measurement log related to a radio environment measured based on an instruction from a network and a connection establishment failure log related to a failure of RRC connection establishment procedure with the network, the method includes the steps of: reserving a dedicated memory area for storing the connection establishment failure log, by the user terminal; and storing the connection establishment failure log in the dedicated memory area reserved in the reserving step, by the user terminal.
Abstract:
A radio base station (100) transmits a Capability Request message to a radio terminal (200), which is connected to the radio base station, to transmit terminal capability information that indicates positioning capability of the radio terminal, and receives a Capability Indication message transmitted from the radio terminal (200). The radio base station (100) determines, corresponding to the received Capability Indication message, whether positional information that indicates the geographical position of the radio terminal (200) can be acquired from the radio terminal (200).
Abstract:
A mobile communication system according to the present invention supports a D2D communication that is a direct terminal-to-terminal communication. The system comprises: a base station configured to perform a predetermined radio communication by using a specific frequency band; and a user terminal configured to exist in a cell of the base station. The base station permits the user terminal to perform the D2D communication in which the specific frequency band is used, in a time period during which the predetermined radio communication is stopped.
Abstract:
A mobile communication system is a mobile communication system that supports D2D communication that is direct device-to-device communication, and includes a user terminal configured to establish a radio connection with a base station, where the user terminal transmits terminal measurement information indicating information obtained by measurement of the user terminal, to the base station, and a network including the base station instructs the user terminal to start the D2D communication, when it is determined on the basis of the terminal measurement information that interference to the base station does not exceed a permissive amount when the user terminal performs the D2D communication.
Abstract:
A mobile communication system includes a base station that configures a plurality of cells. The plurality of cells include D2D supporting cell that supports D2D communication in which data communication is directly performed between terminals and D2D non-supporting cell that does not support the D2D communication. The base station transmits D2D information indicating that the D2D communication is permitted even in the D2D non-supporting cell as well as the D2D supporting cell.
Abstract:
A mobile communication system that comprises: a base station that manages a cell; a user terminal connectable to the cell; and another user terminal that can communicate, via the base station, with the user terminal, and that supports D2D communication that is direct device-to-device communication, wherein the user terminal starts transmitting a discovery-use signal for the D2D communication when it is determined that the user terminal and the other user terminal exist in the vicinity while the user terminal communicates with the other user terminal connected to a neighbor cell adjacent to the cell.
Abstract:
A terminal apparatus includes multiple visible light communicators including a visible light communicator and a visible light communicator, and a controller configured to control the multiple visible light communicators. The multiple visible light communicators each have a directivity in a different direction. The controller performs switching control of switching from a state in which the visible light communicator performs visible light communication with a base station apparatus to a state in which the visible light communicator performs visible light communication with a base station apparatus.