Abstract: A communication control method comprises: receiving, by a user terminal, from a base station, first information indicating a Device to Device (D2D) frequency available in a D2D discovery procedure for discovering a proximal terminal; and using, by the user terminal, not only the frequency indicated by the first information, but also a frequency not indicated by the first information. The frequency not indicated by the first information is different from the frequency indicated by the first information and is indicated by second information received from another cell different from a cell in which the user terminal exists.

Abstract: A communication control method according to a first aspect is a method in a mobile communication system for supporting dual connectivity communication using a master base station for establishing RRC connection with a user terminal and a secondary base station for providing additional radio resources to the user terminal. The communication control method comprises: an inter-master base station handover procedure for performing handover of the user terminal from a source master base station to a target master base station without changing the secondary base station.

Abstract: A mobile communication system, which supports D2D communication that is direct device to device communication, comprises: a user terminal that transmits a discovery signal that is used for discovering a communication partner terminal in the D2D communication, wherein the user terminal transmits the discovery signal when the user terminal accepts start of communication and the user terminal has difficulty to establish a connection with a base station.

Abstract: A first base station is configured to be connected with a second base station via an X2 interface. The first base station includes: a controller containing at least one processor and at least one memory, and configured to execute processes of transmitting a message, which includes a first identifier, coverage state information, and a second identifier, to the second base station before modifying a coverage of the first cell, the first identifier identifying the first cell, the coverage state information indicating that a state of the coverage after modification of the coverage, the second identifier identifying a second cell for compensating at least part of the coverage of the first cell; and modifying the coverage of the first cell after transmitting the message.

Abstract: A control method comprises: transmitting, by a first management apparatus included in a first network allocated with a first frequency band, to a second network allocated with a second frequency band, an allocation request signal for requesting allocation of a part of the second frequency band to the first network, the signal being generated on the basis of a usage state of the first frequency band, determining, by a second management apparatus included in the second network, on the basis of a usage state of the second frequency band, a bandwidth to be allocated to the first network out of the second frequency band and an allocated frequency band corresponding to the bandwidth; managing the allocated frequency band as unavailable; transmitting, an allocation request response signal including information indicating the allocated frequency band, to the first network; and managing the allocated frequency band as available in the first network.

Abstract: A mobile communication system comprises: a base station, a first user terminal that establishes a connection with the base station, and a second user terminal that performs communication with the first user terminal via the base station, the mobile communication system supporting D2D communication that is direct device to device communication, wherein when it is determined that the D2D communication by the first user terminal and the second user terminal is possible, the base station transmits, to the first user terminal, an instruction for having a signal for discovery transmitted, the signal for discovery being used in discovery of a communication partner terminal in the D2D communication.

Abstract: A communication control method comprises: transmitting, by a communication apparatus, a Device to Device (D2D) resource notification to a user terminal. The D2D resource notification includes information indicating a predetermined D2D radio resource available in a D2D proximity service and information indicating a condition not allowing for use of the predetermined D2D radio resource.

Abstract: A communication control method according to a present embodiment comprises: a step of transmitting, by a first base station, to a third base station that is a neighboring base station of the first base station, a first resource message relating to a first D2D resource used for the D2D proximity service in the first base station. The first resource message includes information on the first D2D resource and a second D2D resource used for the D2D proximity service in a second base station that is a neighboring base station of the first base station.

Abstract: A wireless communication device for performing communication with a controlled wireless communication device that is controlled by the wireless communication device includes a controller configured to estimate channel quality of a channel that is used in feedback of a signal from the controlled wireless communication device, dynamically adjust, on the basis of the estimated channel quality, the number of quantized bits to be used when the controlled wireless communication device quantizes channel state information, and notify the controlled wireless communication device of the dynamically adjusted number of quantized bits. The controller is also configured to adjust the number of quantized bits such that the number of quantized bits increases as the estimated channel quality improves.

Abstract: A wireless communication device for performing communication with a controlled wireless communication device includes a controller configured to estimate channel quality of a channel used in feedback of a signal from the controlled wireless communication device and control weighting of a transmission signal in consideration of the estimated channel quality. The controller stores multiple methods of generating a transmission antenna weight that is used in the weighting of the transmission signal, and performs the weighting of the transmission signal by switching among the multiple methods of generating a transmission antenna weight on the basis of the estimated channel quality.

Abstract: A communication control method comprises: transmitting, by a communication apparatus, a Device to Device (D2D) resource notification to a user terminal. The D2D resource notification includes information indicating a predetermined D2D radio resource available in a D2D proximity service and information indicating a condition not allowing for use of the predetermined D2D radio resource.

Abstract: A first base station is configured to be connected with a second base station via an X2 interface. The first base station includes: a controller containing at least one processor and at least one memory, and configured to execute processes of transmitting a message, which includes a first identifier, a change notification, coverage state information, and a second identifier, to the second base station before modifying a coverage of the first cell, the first identifier identifying the first cell, the change notification indicating that the first base station is planned to modify the coverage of the first cell, the coverage state information indicating that a state of the coverage after modification of the coverage, the second identifier identifying a second cell for compensating at least part of the coverage of the first cell; and modifying the coverage of the first cell after transmitting the message.

Abstract: A communication control method according to a first aspect is a method in a mobile communication system for supporting dual connectivity communication using a master base station for establishing RRC connection with a user terminal and a secondary base station for providing additional radio resources to the user terminal. The communication control method comprises: an inter-master base station handover procedure for performing handover of the user terminal from a source master base station to a target master base station without changing the secondary base station.

Abstract: A first base station is configured to be connected with a second base station via an X2 interface. The first base station includes: a controller containing at least one processor and at least one memory, and configured to execute processes of transmitting a message, which includes a first identifier, a change notification, coverage state information, and a second identifier, to the second base station before modifying a coverage of the first cell, the first identifier identifying the first cell, the change notification indicating that the first base station is planned to modify the coverage of the first cell, the coverage state information indicating that a state of the coverage after modification of the coverage, the second identifier identifying a second cell for compensating at least part of the coverage of the first cell; and modifying the coverage of the first cell after transmitting the message.

Abstract: A transmitting apparatus includes: a grouping unit (11A) configured to divide the information bit sequence to generate multiple information bit groups having different degrees of importance; an encoding unit (12A) configured to individually encode each of the multiple information bit groups at a coding rates set according to a corresponding degree of importance while maintaining a total coding rate for the multiple information bit groups to be the target coding rate; and a coupling unit (13A) configured to couple multiple encoded bit groups obtained by individually encoding the multiple information bit groups, to generate the encoded bit sequence.

Abstract: A user terminal comprises a controller configured to measure a state on a downlink channel; transmitter configured to transmit, to a base station, channel state information on the state; and a receiver configured to receive, from the base station, control information on an uplink channel state measured by the base station. The controller is configured to adaptively modify, on the basis of the control information, the number of bits of the channel state information.

Abstract: A base station according to one embodiment is a base station managing a cell. The base station comprises a transmitter configured to be capable of transmitting, with a first transmission power, predetermined information to a user terminal connected with the cell, and a controller configured to control the base station. When an amount or a ratio of an unassigned resource exceeds a threshold value, the unassigned resource being a radio resource capable of being used for transmitting the predetermined information and being not yet assigned to a terminal, the controller performs, with a second transmission power lower than the first transmission power, redundant transmission control in which the predetermined information is redundantly transmitted by using the unassigned resource. The predetermined information is control information or user data.

Abstract: A master evolved Node-B (MeNB) connects to a user terminal together with a secondary evolved Node-B (SeNB) in a dual connectivity scheme. The MeNB includes: transmitter configured to transmit a message to the SeNB via an X2 interface. The message is an SeNB addition request message or an SeNB modification request message. The message includes identification information of a serving gateway connected with the MeNB via an S1 interface. The identification information includes an S1 tunnel endpoint ID (S1-TEID) of the serving gateway or an internet protocol (IP) address of the serving gateway.

Abstract: A user terminal according to the present invention is a user terminal in a mobile communication system that supports D2D communication that is direct device-to-device communication. The user terminal comprises: a receiver configured to receive, from a network device, D2D terminal information on another user terminal located around the user terminal, the network apparatus managing a location of the another user terminal that distributes information by the D2D communication; and a controller configured to perform control for discovering the another user terminal, on the basis of the D2D terminal information.

Abstract: A communication control method pertaining to an embodiment of the present invention is for controlling dual connectivity communication which uses a master base station that establishes RRC connection with a user terminal and a secondary base station that provides a supplementary wireless resource to the user terminal. The communication control method comprises: a step in which the master base station receives, from the user terminal, a measurement report which includes measurement results found for each cell in the user terminal; and a step in which the secondary base station receives, from the master base station, a supplementary request for requesting the allocation of resources to the user terminal. In the step for receiving a supplementary request, the master base station includes, in the supplementary request, measurement results for a cell of the secondary base station which is included in the measurement results, and transmits the same.