Abstract: A network device includes: a QoS management unit that measures a quality of service when user data transfer is performed between wireless terminal devices via user transfer function units of a core system device that controls a network; a PDU session management unit that acquires information of sessions from a session management function unit of the core system device, the sessions having been established for user data transfer between the wireless terminal devices; a PDU session setting unit that determines whether or not to establish new sessions, based on the quality of service; a user-data transfer destination management unit that manages a group that is based on the new sessions and transfer destinations of user data in the new sessions; and a user-data transfer destination setting unit that sets, to the session management function unit, the transfer destinations of user data in the new sessions.

Abstract: An interface conversion apparatus includes processing circuitry. The processing circuitry measures communication quality inside the mobile communication system. The processing circuitry refers to evaluation index information specifying, for each communication group, an allowable range of variation in the measurement result of the communication quality and a fluctuation adjustment time, and determines the communication group in which a variation in the measurement result of the communication quality obtained from history information including a measurement result falls within the allowable range for each piece of identification information included in the packet. The processing circuitry selects the communication group of the packet received from the identification information of the packet received, based on a correspondence relationship between the communication group determined and the identification information of the packet.

Abstract: A wireless communication device included in a wireless communication system together with a wireless network device includes: processing circuitry to measure traffic transferred between the wireless network device and a time sensitive network, the processing circuitry performing wireless communication with the wireless network device and wired communication with the time sensitive network; to estimate an estimated passage time of the traffic that has cyclicity among the traffic; to determine a log level by using a first log level, which is based on a difference between the estimated passage time of the traffic estimated and an actual passage time of the traffic measured, and a second log level acquired from the wireless network device; to collect log information at a collection frequency based on the log level; and to report the log information to the wireless network device at a reporting frequency based on the log level.

Abstract: An interface conversion device of a mobile communication system includes: a delay amount measurement unit that measures a delay amount from a difference between an input time at which the mobile communication system has acquired a periodically transmitted time-synchronization signal and an output time at which the mobile communication system outputs the time-synchronization signal; a memory that stores delay amount history information including the measured delay amount; a variation evaluation unit that measures a variation amount indicating an instantaneous variation of the delay amount, using the delay amount history information and evaluates whether the variation amount is within an allowable range; and an anomaly detection unit that detects a communication anomaly in the mobile communication system on the basis of a result of the evaluation.

Abstract: A position management server being a first position management server in a radio communication system that includes the first position management server to hold first position information indicating a position of a mobile object measured by a first method, and a second position management server to hold second position information indicating the position of the mobile object measured by a second method, includes: a storage unit that holds the first position information; a communication unit that receives the second position information from the second position management server, and transmits the first position information to the second position management server; and a control unit that generates third position information indicating the position of the mobile object by using the second position information and the first position information, and causes the third position information to be held in the storage unit.

Abstract: A satellite communication ground station as a satellite communication device performs communication control of a satellite backhaul link in a mobile communication system in which a ground base station and a core network device are connected via the satellite backhaul link, the satellite communication ground station including: a storage unit that stores a conversion table used in converting quality of service indicators that have different forms in the mobile communication system and the satellite backhaul link; and a quality of service indicator updating unit that updates priority of the quality of service indicator including priority of wireless communication of the satellite backhaul link in the conversion table on the basis of a result of evaluation of quality of service for each quality of service indicator.

Abstract: An access point according to the present invention is an access point that receives first information measured by a sensor from a terminal and transmits the first information as sensor information to a server, the access point including: a measurement result estimator that estimates an estimation result that is information indicating an estimated value of the first information and is information to be used by the terminal to determine whether to transmit the first information; a communicator that transmits the estimation result to the terminal; and a wide area interface that transmits the estimation result as the sensor information to the server in a case where the first information is not received from the terminal for a certain period of time or longer after transmission of the estimation result to the terminal.

Abstract: A frequency-sharing radio communication system that includes a terrestrial radio communication system and a satellite communication system and in which a frequency band of a radio wave used by a terrestrial base station and a radio terminal of the terrestrial radio communication system overlaps with a frequency band of a beam radiated from a satellite of the satellite communication system, includes: a monitoring device that stores management information that associates a frequency used by the terrestrial base station, the usage state of the frequency, and a frequency of the beam radiated to an area where the terrestrial base station is located; and a managing device that selects, based on the management information, the terrestrial base station that shares a frequency with the beam and is located within an irradiation range of the beam, and instructs the selected terrestrial base station to stop using the shared frequency.

Abstract: A satellite communication terminal according to the present invention includes a wired I/F unit to receive monitoring information from a mobile base station, which is a result of monitoring a device state of the mobile base station, a wireless I/F unit to perform radio communication with a satellite, a storage device to store therein monitoring-information processing policy information that indicates conditions for selecting the monitoring information to be transferred to the wireless I/F unit from among the monitoring information, and a monitoring-information processing unit to select the monitoring information to be transferred to the wireless I/F unit from among the monitoring information on a basis of the monitoring-information processing policy information, and to transfer the selected monitoring information to the wireless I/F unit.