Abstract: In a case where a relay terminal (110) exists inside an area (102) where radio waves from a base station (101) reach while a remote terminal (130) exists outside the area (102) where the radio waves from the base station (101) reach, when receiving emergency warning information which is information for notification of an emergency situation from the base station (101), the relay terminal (110) transmits the emergency warning information to the remote terminal (130) by using a connection that has been established between the relay terminal and the remote terminal (130) for one-to-one communication using a Physical Sidelink Shared CHannel (PSSCH).

Abstract: A base station device is configured to set, for each communication terminal device, a radio format for signals transmitted to and received from the communication terminal device. The radio format is set for each communication terminal device in accordance with, for example, a type of use including a moving speed of the communication terminal device. The base station device may be configured to change the radio format for the communication terminal device based on the information about a change in the environment of a radio communication between the communication terminal device and the base station device and a change including the communication terminal device's location. The signals transmitted and received between the base station device and the communication terminal device include radio formats in which at least one of a length of a symbol of the signal and a length of a cyclic prefix in an OFDM scheme differs.

Abstract: A terminal device having a relay function of relaying a signal received from a first peripheral terminal among peripheral terminals, which are other terminal devices available for direct communication with the terminal device, to a second peripheral terminal among the peripheral terminals, the terminal device including: a detection unit that detects the peripheral terminals; a storage unit that holds peripheral terminal information that is information on each of the peripheral terminals detected by the detection unit; and an information notification unit that transmits a notification message for notifying the other terminal devices of information on the terminal device, the notification message including the peripheral terminal information held by the storage unit.

Abstract: In the SL communication, the QoS required for each service is maintained, and the reliability of the service is enhanced. A communication system includes a base station, and a plurality of communication terminals configured to perform communication with the base station and perform Device-to-Device communication. A first communication terminal transmits, to a third communication terminal, a scheduling request for performing the Device-to-Device communication with a second communication terminal. The third communication terminal transmits, to the base station, the scheduling request received from the first communication terminal. In response to the scheduling request received from the third communication terminal, the base station generates scheduling information on the Device-to-Device communication between the first communication terminal and the second communication terminal, and transmits the scheduling information to the third communication terminal.

Abstract: Provided is a technology for implementing a service using Device-to-Device communication such as the V2X communication. A communication system includes: a base station configured to perform communication with a core network; and a communication terminal configured to perform radio communication with the base station. The base station supports a Non-Public Network. The communication terminal is configured to implement a service using Device-to-Device Communication. The communication terminal determines whether the base station is accessible, based on information indicating in which Non-Public Network various services using the Device-to-Device Communication are available.

Abstract: A base station device is configured to set, for each communication terminal device, a radio format for signals transmitted to and received from the communication terminal device. The radio format is set for each communication terminal device in accordance with, for example, a type of use including a moving speed of the communication terminal device. The base station device may be configured to change the radio format for the communication terminal device based on the information about a change in the environment of a radio communication between the communication terminal device and the base station device and a change including the communication terminal device's location. The signals transmitted and received between the base station device and the communication terminal device include radio formats in which at least one of a length of a symbol of the signal and a length of a cyclic prefix in an OFDM scheme differs.

Abstract: A base station device is configured to set, for each communication terminal device, a radio format for signals transmitted to and received from the communication terminal device. The radio format is set for each communication terminal device in accordance with, for example, a type of use including a moving speed of the communication terminal device. The base station device may be configured to change the radio format for the communication terminal device based on the information about a change in the environment of a radio communication between the communication terminal device and the base station device and a change including the communication terminal device's location. The signals transmitted and received between the base station device and the communication terminal device include radio formats in which at least one of a length of a symbol of the signal and a length of a cyclic prefix in an OFDM scheme differs.

Abstract: A base station device is configured to set, for each communication terminal device, a radio format for signals transmitted to and received from the communication terminal device. The radio format is set for each communication terminal device in accordance with, for example, a type of use including a moving speed of the communication terminal device. The base station device may be configured to change the radio format for the communication terminal device based on the information about a change in the environment of a radio communication between the communication terminal device and the base station device and a change including the communication terminal device's location. The signals transmitted and received between the base station device and the communication terminal device include radio formats in which at least one of a length of a symbol of the signal and a length of a cyclic prefix in an OFDM scheme differs.

Abstract: A base station device is configured to set, for each communication terminal device, a radio format for signals transmitted to and received from the communication terminal device. The radio format is set for each communication terminal device in accordance with, for example, a type of use including a moving speed of the communication terminal device. The base station device may be configured to change the radio format for the communication terminal device based on the information about a change in the environment of a radio communication between the communication terminal device and the base station device and a change including the communication terminal device's location. The signals transmitted and received between the base station device and the communication terminal device include radio formats in which at least one of a length of a symbol of the signal and a length of a cyclic prefix in an OFDM scheme differs.

Abstract: A base station device is configured to set, for each communication terminal device, a radio format for signals transmitted to and received from the communication terminal device. The radio format is set for each communication terminal device in accordance with, for example, a type of use including a moving speed of the communication terminal device. The base station device may be configured to change the radio format for the communication terminal device based on the information about a change in the environment of a radio communication between the communication terminal device and the base station device and a change including the communication terminal device's location. The signals transmitted and received between the base station device and the communication terminal device include radio formats in which at least one of a length of a symbol of the signal and a length of a cyclic prefix in an OFDM scheme differs.

Abstract: A base station has a first wireless communication unit that communicates with mobile stations for offering a first radio communication service to the mobile stations, and a second wireless communication unit that communicates with mobile stations for offering a second radio communication service that is different from the first radio communication service to the mobile stations. At the base station, a communication service continuation restrictor is provided that restricts operation of the base station as to whether or not, when it is detected that either one of the first or the second radio communication service is not executable, another radio communication service should be continued. Whether or not the other communication service should be continued can be set at the communication service continuation restrictor.

Abstract: A base station has a first wireless communication unit that communicates with mobile stations for offering a first radio communication service to the mobile stations, and a second wireless communication unit that communicates with mobile stations for offering a second radio communication service that is different from the first radio communication service to the mobile stations. At the base station, a communication service continuation restrictor is provided that restricts operation of the base station as to whether or not, when it is detected that either one of the first or the second radio communication service is not executable, another radio communication service should be continued. Whether or not the other communication service should be continued can be set at the communication service continuation restrictor.

Abstract: When receiving an inquiry about whether allocation of a mobile communication device can be made from an arbitrary base station device, a handover control unit 20 records the number of times that a handover has been carried out for the arbitrary base station device. When receiving an inquiry about whether allocation can be made from another base station device, a control enable or disable determining unit 30 determines that the allocation can be made if the number of handover times recorded for the other base station device in the handover control unit 20 is smaller than a predetermined value and the base station itself can satisfy a throughput which the mobile communication device requests.