Abstract: A terminal apparatus includes a plurality of subscriber identity modules (SIMs). The terminal apparatus is configured to connect a plurality of networks using the plurality of SIMs. The terminal apparatus is configured to determine paging collision between the plurality of networks.

Abstract: A communication system which realizes avoidance of complexity in the positioning of a communication terminal and to which a fifth-generation wireless access system is applied includes: a network-side device equipped with a location management function of the fifth-generation wireless access system; and a base station. When a positioning request for a communication terminal connected to the base station occurs, the base station to which a positioning target terminal that is a communication terminal to be subjected to positioning is connected notifies the network-side device of information related to a timing at which the positioning target terminal is able to receive a positioning signal, and the network-side device determines setting contents related to a transmission/reception timing of a positioning signal based on the information provided from the base station, and notifies the base station that transmits the positioning signal and the positioning target terminal of the setting contents determined.

Abstract: A U2N relay (110 #2) transmits a first sidelink discovery message containing base-station identification information of a base station (130) when the U2N relay (110 #2) is in communication range with the base station (130). When a U2U relay (110 #3) is in communication range with the U2N relay (110 #2) and not in communication range with the base station (130), the U2U relay (110 #3) receives the first sidelink discovery message and transmits a second sidelink discovery message containing mobile-terminal-device identification information of the U2N relay (110 #2) and base-station identification the information. When a remote UE (110 #1) is in communication range with the U2U relay (110 #3) and no in communication range with the base station (130) and the U2N relay (110 #2), the remote UE (110 #1) receives the second sidelink discovery message and establishes communication path to communicate with the base station (130) via the U2U relay (110 #3) and the U2N relay (110 #2).

Abstract: A communication system includes: a communication terminal that encodes transmission data by using an encoding model that encodes and outputs data that has been input; and a base station that decodes data encoded with the encoding model by using a decoding model that, when encoded data is input, decodes and outputs the data, the encoding model performs encoding on channel state-related data that is data on a channel state between the communication terminal and the base station, and the base station executes machine learning using learning data including the channel state-related data in an un-encoded state to generate the encoding model and the decoding model, and notifies the communication terminal of a learning result of the encoding model.

Abstract: A communication system includes a base station and a communication terminal connected to the base station. The base station transmits a result of reception of an uplink positioning signal transmitted by the communication terminal and location information of the base station to a positioning device that is a device having a positioning function of deriving a location of the communication terminal, and the communication terminal transmits a result of reception of a downlink positioning signal transmitted by the base station to the positioning device.

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: A technology that enables prompt NW connection is provided. A communication system includes: a communication terminal; and a plurality of networks configured to perform radio communication with the communication terminal. The communication terminal determines whether or not there is paging causing collision among a plurality of pagings respectively transmitted to the communication terminal from the plurality of networks. When the communication terminal detects the collision of the paging, the communication terminal notifies at least one of the plurality of networks that transmits the paging causing the collision of the paging about the collision of the paging.