Abstract: A communication control method used in a mobile communication system for providing a multicast and broadcast service (MBS) from a first base station to a first user equipment includes collecting, by the first base station and from at least one second base station within a predetermined range from the first base station, MBS interest information received by the at least one second base station from a second user equipment, and controlling, by the first base station, MBS transmission of the first base station, based on the MBS interest information collected.

Abstract: A communication control method used in a mobile communication system, the mobile communication system providing a multicast broadcast service (MBS) from a base station to a user equipment, the communication control method including, by the base station, performing header compression processing in which transmission of header information is omitted, the header information being static information included in a header of an MBS packet, and transmitting a compressed MBS packet subjected to the header compression processing, and transmitting, by the base station, after starting transmitting of the compressed MBS packet, the header information separately from the compressed MBS packet.

Abstract: Provided is a communication control method used in a mobile communication system providing a multicast and broadcast service (MBS) from a base station to a user equipment and includes receiving, by the user equipment in an RRC connected state and from the base station, unicast signalling including an MBS configuration used for MBS reception, and performing, by the user equipment having transitioned from the RRC connected state to an RRC idle state or an RRC inactive state, the MBS reception by using the MBS configuration received in the RRC connected state.

Abstract: An embodiment provides a communication control method in a mobile communication system including a first user equipment and a second user equipment. The first user equipment and the second user equipment communicate wirelessly with each other by sidelink communication. The communication control method includes, by the first user equipment in a PC5-Radio Resource Control (RRC) connected state with the second user equipment, measuring a channel utilization of a radio resource used for the sidelink communication and transmitting the measured channel utilization to the second user equipment. Furthermore, the communication control method includes receiving, by the second user equipment, the channel utilization.

Abstract: A communication control method used in a mobile communication system for providing an MBS includes configuring, by abase station, for a user equipment, a multicast broadcast service (MBS) bearer split into a point-to-point (PTP) communication path and a point-to-multipoint (PTM) communication path, and transmitting, by the base station, to the user equipment, an indication of individually activating or deactivating the PTP communication path and the PTM communication path.

Abstract: In an embodiment, a communication control method is a communication control method used in a mobile communication system, the mobile communication system including a user equipment and a base station apparatus and being configured to perform wireless communication between the user equipment and the base station apparatus. The communication control method includes acquiring, by a first layer of the user equipment, slice information of a cell in which the user equipment exists, the slice information being transmitted from the base station apparatus, and notifying, by the first layer of the user equipment, a second layer of the user equipment of the slice information, the second layer being positioned higher than the first layer.

Abstract: A communication control method used in a mobile communication system that provides a multicast broadcast service (MBS) from a base station to a user equipment includes receiving, at a first base station establishing an MBS connection with a core network apparatus, MBS data from the core network apparatus through the MBS connection, transmitting, from the first base station to a first user equipment in multicast or broadcast, the MBS data received from the core network apparatus, and transmitting, from the first base station to a second base station, at least one of a first identifier or a second identifier, the first identifier identifying the core network apparatus, the second identifier identifying an MBS session provided by the first base station in multicast or broadcast.

Abstract: A UE comprises: a controller configured to determine a timing of making a connection request to the base station when there is a need to start communication with the base station while the UE is in a RRC idle state; and a transmitter configured to transmit a connection request signal to the base station at the determined timing. The controller is configured to determine the timing using an identifier allocated to the radio terminal.

Abstract: A communication control method used in a cellular communication system includes transmitting, by a relay user equipment having a capability of relaying data of a remote user equipment, a message including information related to the relay user equipment, receiving, by the remote user equipment, the message, and performing, by the remote user equipment, processing that establishes sidelink connection between the remote user equipment and the relay user equipment, based on the message.

Abstract: A communication control method used in a user equipment, user equipment, and apparatus for controlling a user equipment used in a user equipment perform early data transmission in which uplink user data is transmitted during a random access procedure. The user equipment receives from a base station, a first timer value for a random access procedure without the early data transmission and a second timer value for a random access procedure with the early data transmission, selects the second timer value in response to determining that the user equipment performs the early data transmission, and starts a timer configured with the second timer value in response to transmitting the uplink data by the early data transmission.

Abstract: A user equipment and apparatus receive from a base station, configuration information configuring the user equipment to provide assistance information indicating a preference of the user equipment to leave RRC connected state, and transmit to the base station, assistance information indicating that a preferred RRC state of the user equipment is an RRC state in which an RRC connection is suspended. A base station transmits to a user equipment, configuration information configuring the user equipment to provide assistance information indicating a preference of the user equipment to leave RRC connected state, and receives from the user equipment, assistance information indicating that a preferred RRC state of the user equipment is an RRC state in which an RRC connection is suspended.

Abstract: In an embodiment, a communication control method is a communication control method in a mobile communication system that includes a first user equipment and a second user equipment and can perform sidelink communication between the first user equipment and the second user equipment. The communication control method includes, when the first user equipment transmits a Radio Resource Control (RRC) message including configuration information related to the sidelink communication, and discontinuous reception is configured between the first user equipment and the second user equipment, performing, by the first user equipment, waiting processing for reception of an RRC response message responding to the RRC message regardless of a configuration of the discontinuous reception. The communication control method includes transmitting, by the second user equipment, the RRC response message responding to the RRC message when receiving the RRC message, and receiving, by the first user equipment, the RRC response message.

Abstract: A communication control method used in a cellular communication system includes determining, by a remote user equipment having sidelink connection with a relay user equipment, a network communication state between the remote user equipment and a cellular communication network, and performing, by the remote user equipment, control related to sidelink communication between the remote user equipment and the relay user equipment, based on the network communication state.

Abstract: An unmanned aerial vehicle (UAV) receives a set of Random Access preambles, determines its UAV status, and selects a Random Access preamble from the set of Random Access preambles. In some cases, the set of Random Access preambles are allocated for use by UAVs and are common to a plurality of neighboring cells. The UAV transmits the selected Random Access preamble to multiple neighboring cells. One of the neighboring cells that received the selected Random Access preamble transmits a Random Access Response to the UAV. The UAV determines which cell sent the Random Access Response, reselects to the cell that sent the Random Access Response, and transmits a Radio Resource Control (RRC) Connection Establishment Request to the reselected cell. Upon completion of a Random Access Channel (RACH) procedure, the reselected cell becomes the serving cell for the UAV.

Abstract: A user equipment, method used in a user equipment, and apparatus controlling a user equipment receive an RRC (Radio Resource Control) Release message when the user equipment is in an RRC connected state. The RRC Release message includes information indicating an uplink radio resource used for transmitting uplink data from the user equipment in an RRC inactive state. The user equipment, method, and apparatus control, in response to receiving the RRC Release message, the user equipment to transition from the RRC connected state to the RRC inactive state. The user equipment, method, and apparatus transmit the uplink data by using the uplink radio resource indicated by the information included in the RRC Release message when the user equipment is in the RRC inactive state.

Abstract: A receiving user equipment (UE) device transmits a distance-based hybrid automatic repeat request (HARQ) feedback message to a transmitting UE device based on sidelink signal quality when location information is unavailable. The receiving UE device is one of a group of UE devices receiving a groupcast data transmission from the transmitting UE device where the groupcast data transmission comprises a distance-based hybrid automatic repeat request (HARQ) feedback configuration. When location information is unavailable to the receiving UE device, the receiving UE device transmits the distance-based HARQ feedback if the signal strength of a signal received from the transmitting UE device is above a threshold and does not send the HARQ feedback if the signal quality is below the threshold. The threshold may be received from the transmitting UE device.

Abstract: A communication control method according to an aspect is a communication control method using a user equipment, the user equipment including a first SIM corresponding to a first mobile network and a second SIM corresponding to a second mobile network. The communication control method includes transmitting, by the user equipment, timing information to the first mobile network in response to occurrence of a predetermined event, and the timing information indicates an execution timing that is a timing at which communication is executed in the second mobile network.

Abstract: A communication control method used in a user equipment, a user equipment, an apparatus for controlling a user equipment, and a base station that communicates with user equipment. The user equipment performs a predetermined data transmission in which it transmits uplink user data in an RRC idle state. When the user equipment is in an RRC connected state, it transmits an RRC message to a base station indicating that the user equipment is interested to perform the predetermined data transmission after transitioning to RRC idle mode. The base station receives, from user equipment when the user equipment is in an RRC connected state, the RRC message indicating that the user equipment is interested to perform the predetermined data transmission after transitioning to RRC idle mode.

Abstract: A communication control method is used in a mobile communication system including a base station for providing a multicast broadcast service (MBS) to a user equipment. The communication control method includes transmitting, by the user equipment configured to receive MBS data via an MBS communication path, to the base station, notification information notifying a desire of the user equipment related to configuration of a unicast communication path associated with the MBS communication path.

Abstract: A communication control method includes performing, by a relay node, recovery processing of recovering a radio backhaul link in response to an occurrence of an event related to a failure in the radio backhaul link. The performing the recovery processing includes transmitting failure information indicating the occurrence of the event to a lower node of the relay node at time of initiating RRC reestablishment processing of reestablishing the radio backhaul link, as a part of the recovery processing.