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 base station is used for a mobile communication system that supports a dual connectivity. The base station includes a controller configured to establish an RRC connection with a user terminal, and to perform a mobility control in the dual connectivity.
Abstract:
An LTE system includes an eNB 200-2 configured to support D2D communication which is one of LTE communication schemes and in which communication is directly performed between proximal devices, and an eNB 200-1 included in an LTE network. A communication control method includes: a step S11 of requesting, by the eNB 200-2, an allocation of a D2D communication resource to the eNB 200-1; a step S12 of allocating, by the eNB 200-1, on the basis of the request from the eNB 200-2, the D2D communication resource from a specific frequency band shared by a plurality of mobile network operators or a plurality of communication systems, to the eNB 200-2; and a step S16 of performing, by the eNB 200-2, the D2D communication by using the D2D communication resource allocated from the eNB 200-1.
Abstract:
A base station is used for a mobile communication system that supports a dual connectivity. The base station includes a controller configured to establish an RRC connection with a user terminal, and to perform a mobility control in the dual connectivity.
Abstract:
D2D communication is appropriately controlled even in an environment in which a user terminal inside the coverage and a user terminal outside the coverage both exist. A method includes: a step of receiving, by UE 100-1 included in a plurality of UEs 100, from UE 100-n included in the plurality of UEs 100, information related to the UE 100-n; and a step of selecting, by the UE 100-1, a control user terminal for controlling D2D communication, based on the information related to the UE 100-n, from among the plurality of UEs 100.
Abstract:
A communication control method according to an embodiment, comprises: transmitting, by a base station, information indicating a radio resource region by broadcast, wherein the radio resource region indicates a region of radio resources which a user terminal is able to use in order to receive a direct radio signal from a proximal user terminal; allocating, by the base station, a radio resource among the radio resource region to the user terminal; and dedicatedly transmitting, by the base station, control information to the user terminal. The control information includes information indicating the allocated radio resource. The allocated radio resource is a radio resource which the user terminal is able to use in order to transmit a direct radio signal to the proximal user terminal.
Abstract:
A mobile communication system comprises a user terminal that supports D2D proximity service. The user terminal transmits a D2D synchronization signal that is a synchronization signal for D2D communication and a D2D discovery signal that is a signal for discovering a proximal terminal while associating a location of synchronization signal resources with a location of discovery signal resources. The synchronization signal resources are time-frequency resources used for transmitting the synchronization signal. The discovery signal resources are time-frequency resources used for transmitting the D2D discovery signal.
Abstract:
A user terminal includes a transmitter configured to transmit a Device-to-Device (D2D) indication to a serving cell in response to the user terminal being interested in D2D proximity service, while the user terminal is in a Radio Resource Control (RRC) connected mode in the serving cell.
Abstract:
A user terminal according to an embodiment includes a receiver that receives a list transmitted from a base station, the list including discovery resource configurations; and a controller that selects a discovery resource configuration from among the discovery resource configurations, and uses the selected discovery resource configuration to directly transmit a discovery signal to other user terminals. Each of the discovery resource configurations includes: time resource information indicating time resources used for transmitting a discovery signal and including a variable number substituted into a mathematical expression; frequency resource information indicating frequency resources used for transmitting the discovery signal and including a range of continuous resource block numbers; and power information indicating transmission power used for transmitting the discovery signal.
Abstract:
A user terminal includes a controller configured to perform a network selection operation for selecting an access network in which the user terminal exchanges traffic from among a cellular RAN (Radio Access Network) and a wireless LAN (Local Area Network). The controller performs processes of: receiving wireless LAN identifiers for using the network selection operation, the wireless LAN identifiers broadcasted from a cellular base station, and receiving offload related information for prompting the user terminal to steer the traffic to the wireless LAN, the offload related information broadcasted from the cellular base station.