Abstract: A radio terminal (2) is used in a radio communication system (100) and communicates with a radio station (1). The radio terminal (2) includes a measurement unit (20). The measurement unit (20) operates to perform, using a terminal measurement procedure for executing a first terminal measurement corresponding to radio access technology applied to the radio communication system (100), a second terminal measurement of a shared frequency shared by a plurality of radio systems including the radio communication system (100).

Abstract: A network apparatus (2) transmits, to at least one of a D2D transmitting terminal (1A) and a D2D reception terminal (1B), a first control signal (501) including an indication indicating which of first and second D2D transmission modes is activated. The first D2D transmission mode conforms to a first resource pattern that is repeated every first time period. The second D2D transmission mode conforms to a second resource pattern that is repeated every second time period, the second time period being the same as or different from the first time period. The second resource pattern is defined so as to allow low-latency transmission. In an example, the second resource pattern does not include a control channel subframe pool that is used for transmission of D2D control information indicating resource allocation for data transmission.

Abstract: A radio terminal (1) selects, from a resource pool in a discovery period, NTX sets of resource blocks for NTX transmissions of a discovery signal based on a first value n1 that is a resource value autonomously selected by the radio terminal (1) or is a parameter received from a base station (2). A frequency domain shift from a second resource block set used in (j?1)th transmission (j is an integer no less than 2) to a first resource block set used in j-th transmission of the discovery signal in the discovery period depends on at least one of the first value n1 and a frequency domain position of the second resource block set in the resource pool. It is thus, for example, possible to attenuate decline in reception quality of a discovery signal due to interference resulting from In-Band Emissions (IBE) when direct discovery of D2D communication is performed.

Abstract: A tracking support system includes a position calculating section connected with a plurality of cameras arranged in a predetermined monitoring area to transmit video images imaged by the plurality of cameras and configured to calculate a position of the tracking target based on the video images received from the plurality of cameras; a tracker selecting section configured to select a tracker to be instructed to track the tracking target, based on position information of the terminal received from the terminal and the calculated position of the tracking target; and an information transmitting section configured to transmit information of a distance between the tracking target and the terminal during the tracking of the tracking target to the terminal carried by the selected tracker.

Abstract: Because it is not possible to sufficiently reduce the number base stations that start uselessly in spite of being in a low traffic state, it is not possible to lower interference between adjacent cells and power consumption sufficiently. A base station starts transmission of a control signal with predetermined power when communication between another base station and a mobile station is started and a first predetermined condition is satisfied.

Abstract: A video collection system includes: a plurality of terminals; and a video collection server that requests at least one of the plurality of terminals to perform information provision. The video collection server includes a calculation part, a determination part, and a request part. The calculation part calculates, based on information acquired from a camera(s), a first area(s) imaged by the camera(s). The determination part determines a second area(s) as an information provision target(s) based on a location(s) of the first area(s). The request part selects, based on respective locations of the plurality of terminals and a location(s) of the second area(s), a terminal(s) to be requested to perform the information provision from the plurality of terminals and requests the selected terminal(s) to provide video data of the second area(s).

Abstract: A surveillance system includes an unmanned flying object information management part configured to store information on each of a plurality of unmanned flying objects including a predetermined flying pattern of each of the unmanned flying objects, each of the unmanned flying objects including a surveillance apparatus and being configured to move in the predetermined flying pattern; an unmanned flying object selection part configured to select at least one of the unmanned flying objects to which the surveillance of a surveillance target is requested, based on a predetermined switching condition and information received from each of the unmanned flying objects; and a surveillance instruction part configured to instruct the selected unmanned flying object(s) to surveil the surveillance target by transmitting identification information of the surveillance target to the selected unmanned flying object(s).

Abstract: A transmitting terminal (1A) transmits first D2D control information (522, 523) in one or more subframes within a first subframe pool (511) within a first D2D control period (501) and performs data transmission (531-534) in accordance with the first D2D control information (522, 523) in one or more subframes within a second subframe pool (512) within the first D2D control period (501). The first D2D control information (522, 523) contains a second information element indicating whether the first D2D control information (522, 523) is valid in at least one D2D control period (502, 503) occurring after the first D2D control period (501). This makes it possible to contribute, for example, to reducing failure in reception of scheduling assignment information that is transmitted in a radio resource region for control in a periodic D2D control period and that specifies D2D transmission resources.

Abstract: A wireless terminal (1) includes at least one memory (706), at least one processor coupled to the at least one memory (706); and an RF transceiver (701) capable of performing device-to-device (D2D) communication. The wireless terminal (1) receives a discovery signal transmitted from another wireless terminal (1) by using the RF transceiver (701), estimates a transmission power value of a transmission terminal of the discovery signal in accordance with a type of the discovery signal, and determines an inter-terminal path loss between the wireless terminals by using the estimated transmission power value and the received power value of the discovery signal. In this way, the inter-terminal path loss is estimated without the need for receiving notification regarding a transmission power value from a base station (2) to the terminal (1) when ProSe direct discovery is used.

Abstract: A base station (2) is configured to receive, from a first wireless terminal (1), a first group identifier indicating a first terminal group, and allocate, to the first wireless terminal (1), a second radio resource, rather than a first radio resource, for device-to-device (D2D) communication performed by the first wireless terminal (1). The first radio resource is a radio resource which has already been allocated to any other wireless terminal which has sent the first group identifier. Meanwhile, the second radio resource is a radio resource which has already been allocated to any other wireless terminal which has sent a second group identifier indicating a second terminal group different from the first terminal group. It is thus, for example, possible to preventing a plurality of D2D communication signals, which are transmitted from multiple wireless terminals to a single wireless terminal, from being transmitted on the same radio resource.

Abstract: A radio terminal (2) is used in a radio communication system (100) and communicates with a radio station (1). The radio terminal (2) includes a measurement unit (20). The measurement unit (20) operates to perform, using a terminal measurement procedure for executing a first terminal measurement corresponding to radio access technology applied to the radio communication system (100), a second terminal measurement of a shared frequency shared by a plurality of radio systems including the radio communication system (100).

Abstract: A radio terminal (2) is used in a radio communication system (100) and communicates with a radio station (1). The radio terminal (2) includes a measurement unit (20). The measurement unit (20) operates to perform, using a terminal measurement procedure for executing a first terminal measurement corresponding to radio access technology applied to the radio communication system (100), a second terminal measurement of a shared frequency shared by a plurality of radio systems including the radio communication system (100).

Abstract: A relay selecting entity (1, 3, 5) is configured to select at least one specific relay terminal (2) suitable for a first remote terminal (1) from among one or more relay terminals (2) while considering the number of other remote terminals connected to or communicating with each relay terminal (2). Each specific relay terminal (2) relays traffic between the first remote terminal (1) and a base station (3) through a device-to-device (D2D) link (102) between the specific relay terminal (2) and the first remote terminal (1) and through a backhaul link (101) between the specific relay terminal and the base station.

Abstract: Because it is not possible to sufficiently reduce the number base stations that start uselessly in spite of being in a low traffic state, it is not possible to lower interference between adjacent cells and power consumption sufficiently. A base station starts transmission of a control signal with predetermined power when communication between another base station and a mobile station is started and a first predetermined condition is satisfied.

Abstract: A network apparatus (2) transmits, to at least one of a D2D transmitting terminal (1A) and a D2D reception terminal (1B), a first control signal (501) including an indication indicating which of first and second D2D transmission modes is activated. The first D2D transmission mode conforms to a first resource pattern that is repeated every first time period. The second D2D transmission mode conforms to a second resource pattern that is repeated every second time period, the second time period being the same as or different from the first time period. The second resource pattern is defined so as to allow low-latency transmission. In an example, the second resource pattern does not include a control channel subframe pool that is used for transmission of D2D control information indicating resource allocation for data transmission.

Abstract: Because it is not possible to sufficiently reduce the number base stations that start uselessly in spite of being in a low traffic state, it is not possible to lower interference between adjacent cells and power consumption sufficiently. A base station starts transmission of a control signal with predetermined power when communication between another base station and a mobile station is started and a first predetermined condition is satisfied.

Abstract: In one embodiment, a radio terminal (2) is used in a radio communication system (100) and communicates with a radio station (1). The radio terminal (2) includes a measurement unit (20). The measurement unit (20) operates to perform, using a terminal measurement procedure for executing a first terminal measurement corresponding to radio access technology applied to the radio communication system (100), a second terminal measurement of a shared frequency shared by a plurality of radio systems including the radio communication system (100). This embodiment therefore contributes to simplification of a measurement function which should be supported by the radio terminal when the radio communication system uses a shared frequency (e.g., TVWS) shared by the plurality of radio systems.

Abstract: A transmitting terminal (1A) transmits first D2D control information (522, 523) in one or more subframes within a first subframe pool (511) within a first D2D control period (501) and performs data transmission (531-534) in accordance with the first D2D control information (522, 523) in one or more subframes within a second subframe pool (512) within the first D2D control period (501). The first D2D control information (522, 523) contains a second information element indicating whether the first D2D control information (522, 523) is valid in at least one D2D control period (502, 503) occurring after the first D2D control period (501). This makes it possible to contribute, for example, to reducing failure in reception of scheduling assignment information that is transmitted in a radio resource region for control in a periodic D2D control period and that specifies D2D transmission resources.

Abstract: A wireless terminal (1A) receives a discovery signal (201) wirelessly transmitted from another wireless terminal (1B) via device-to-device (D2D) communication, and transmits a discovery report (202, 302) to a network (2, 3) via cellular communication (101). The discovery report indicates at least one of: (a) an identifier of the other wireless terminal (1B); (b) an identifier(s) of one or more D2D communication pairs to which the other wireless terminal (1B) belongs; (c) an identifier of a base station or a cell with which the other wireless terminal (1B) is associated; (d) received power of a discovery signal from the other wireless terminal (1B); and (e) the number of detections of the discovery signal from the other wireless terminal (1B). It is thus possible to provide a discovery report containing contents suitable for use in a network.

Abstract: A radio terminal (2) is used in a radio communication system (100) and communicates with a radio station (1). The radio terminal (2) includes a measurement unit (20). The measurement unit (20) operates to perform, using a terminal measurement procedure for executing a first terminal measurement corresponding to radio access technology applied to the radio communication system (100), a second terminal measurement of a shared frequency shared by a plurality of radio systems including the radio communication system (100).