Abstract: A state management unit in a base station apparatus transmits an information request signal requesting terminal information to a plurality of terminal apparatuses from a communication unit and receives, using the communication unit, the terminal information from the terminal apparatus in response to the information request signal, the terminal information including information on a transmission power and position information on the terminal apparatus. The role determination unit determines the terminal apparatus having a transmission power larger than a preset threshold value and located in a predetermined area within a preset communication area of a host base station apparatus to have a forwarding role for forwarding a signal, based on the received terminal information. The role determination unit transmits, from the communication unit, a role change signal notifying the terminal apparatus, whose role is determined to be the forwarding role, that the forwarding role is assigned to the terminal apparatus.

Abstract: A wireless communication system includes a management device which receives an audio signal and position information from wireless communication terminals by a first wireless communication system, determines whether an emergency situation signal has been received, decides an emergency-situation influence range, specifies a transmission-destination communication terminal for a control signal, and transmits information to an operator terminal and the control signal to the transmission-destination communication terminal by the first wireless communication system, the operator terminal which receives, by the first wireless communication system, the position information and the audio signal and the transmission-destination information, and transmits, by a second wireless communication system, an audio signal of the operator terminal to the wireless communication terminal, and the wireless communication terminal which transmits the audio signal to the management device to generate the control signal and receives th

Abstract: When a second communication unit receives an identifier received last in time by a second terminal apparatus from the second terminal apparatus as a last identifier, a relay recording control unit causes the second communication unit to transmit a list of identifiers recorded in a recording unit after the last identifier to the second terminal apparatus, and that, when the second communication unit receives the identifier included in the list from the second terminal apparatus as a transmission request identifier, extracts a first sound signal corresponding to the transmission request identifier from the recording unit and causes the recording unit to transmit the first sound signal extracted to the second terminal apparatus as the second sound signal.

Abstract: A wireless communication device comprising a communication unit, a storage, an operation unit, a communication quality measuring unit, and a controller that controls the communication unit and the storage, wherein the controller further controls the storage to store, when the operation unit detects a transmission starting operation during every channel frequency is used by other wireless communication devices, the voice data until the operation unit detects a transmission stopping operation; controls the communication unit to transmit, when every channel frequency is not used and the bit error rate is smaller than a first threshold, all pieces of voice data that have not been transmitted, and to transmit, when every channel frequency is not used and the bit error rate is between the first threshold and a second threshold, a piece of divided data having a predetermined length from a head of the voice data which has not been transmitted.

Abstract: A determination unit refers to position information of a terminal device registered in a given base station device to determine ease of connection to another base station device. A generator generates, for the terminal device, guidance information to prompt the terminal device to move to a position where a likelihood of connection to the other base station device is increased, based on a result of determination in the determination unit. A transmitter transmits the guidance information generated in the generator to the terminal device.

Abstract: A plurality of groups each including a plurality of terminal devices are formed, and each of a plurality of base station devices assigns a channel to each group to enable communication from one of the terminal devices included in the group to which the channel is assigned to another terminal device included in the group, and a receiving unit receives information on the number of terminal devices included in the groups registered in each base station device. A display unit displays information indicating the number of terminal devices for each base station device based on the received information.

Abstract: An acquirer acquires parameters that correspond to a plurality of base station devices using a resource for communication with a terminal device and can be used for predicting a shortage of a resource of each base station device. A generator generates information relating to a priority level of a resource desired to be used by a terminal device connected to one of the plurality of base station devices in accordance with the parameters acquired by the acquirer. A transmitter transmits the information generated by the generator.

Abstract: A determination unit refers to position information of a terminal device registered in a given base station device to determine ease of connection to another base station device. A generator generates, for the terminal device, guidance information to prompt the terminal device to move to a position where a likelihood of connection to the other base station device is increased, based on a result of determination in the determination unit. A transmitter transmits the guidance information generated in the generator to the terminal device.

Abstract: An event information memory stores an occurrence time of an event so as to cause the occurrence time of the event to correspond to each of monitoring targets in which the events occurred (or are scheduled to occur) among a plurality of the monitoring targets. Based on position information for displaying each of a plurality of monitoring targets on a general view, a controller instructs control to draw an event display image on the general view so as to cause the event display image to correspond to the monitoring target in which the event occurred (or scheduled to occur), the monitoring target being stored in the event information memory. The event display image includes: a circular portion indicating a predetermined time in a circumferential direction, an indicator indicating a current hour or minute, and an event occurrence time display portion caused to correspond to the occurrence time of the event.

Abstract: A plurality of groups including a plurality of terminal devices are formed, and further, each of a plurality of base station apparatuses assigns a channel in a unit of the group such that communication is performed from one of the terminal devices included in a group to which the channel is assigned to the other terminal devices included in the group, and a receiver receives information on a busy count generated in the group registered in each of the base station apparatuses. A display unit displays information indicating the busy count for each of the base station apparatuses based on the received information.

Abstract: An acquirer acquires parameters that correspond to a plurality of base station devices using a resource for communication with a terminal device and can be used for predicting a shortage of a resource of each base station device. A generator generates information relating to a priority level of a resource desired to be used by a terminal device connected to one of the plurality of base station devices in accordance with the parameters acquired by the acquirer. A transmitter transmits the information generated by the generator.

Abstract: A plurality of groups including a plurality of terminal devices are formed, and further, each of a plurality of base station apparatuses assigns a channel in a unit of the group such that communication is performed from one of the terminal devices included in a group to which the channel is assigned to the other terminal devices included in the group, and a receiver receives information on a busy count generated in the group registered in each of the base station apparatuses. A display unit displays information indicating the busy count for each of the base station apparatuses based on the received information.

Abstract: A plurality of groups each including a plurality of terminal devices are formed, and each of a plurality of base station devices assigns a channel to each group to enable communication from one of the terminal devices included in the group to which the channel is assigned to another terminal device included in the group, and a receiving unit receives information on the number of terminal devices included in the groups registered in each base station device. A display unit displays information indicating the number of terminal devices for each base station device based on the received information.

Abstract: An event information memory stores an occurrence time of an event so as to cause the occurrence time of the event to correspond to each of monitoring targets in which the events occurred (or are scheduled to occur) among a plurality of the monitoring targets. Based on position information for displaying each of a plurality of monitoring targets on a general view, a controller instructs control to draw an event display image on the general view so as to cause the event display image to correspond to the monitoring target in which the event occurred (or scheduled to occur), the monitoring target being stored in the event information memory. The event display image includes: a circular portion indicating a predetermined time in a circumferential direction, an indicator indicating a current hour or minute, and an event occurrence time display portion caused to correspond to the occurrence time of the event.