Abstract: A communication control method according to a first aspect is a communication control method used in a cellular communication system. The communication control method includes performing, by a first relay node including a lower apparatus under the first relay node, handover from a first donor base station to a second donor base station together with the lower apparatus, and, upon completing the handover to the second donor base station, transmitting, by the first relay node and to the lower apparatus, a notification indicating completion of the handover.

Abstract: A communication control method according to a first aspect is a communication control method used in a cellular communication system. The communication control method includes transmitting, by a relay node that detects occurrence of a failure in a backhaul link between the relay node and a parent node of the relay node, a notification instructing execution of a conditional handover, and receiving, by a communication apparatus, the notification.

Abstract: A user equipment, apparatus for controlling user equipment, and method performed by user equipment includes receiving a radio resource control (RRC) Release message from a base station included in a radio access network (RAN). The RRC Release message includes an indication causing the user equipment to transition from an RRC connected state to a specific state, the specific state being a state in which a RRC connection is suspended for the user equipment. The user equipment is caused to transition from the RRC connected state to the specific state in response to receiving the RRC Release message, perform a cell reselection operation when the user equipment is in the specific state, and perform, when the user equipment in the specific state, an operation of causing the user equipment to transition from the specific state to an RRC idle state in response to reselecting a cell not supporting the specific state.

Abstract: A neighboring cell determines that uplink interference from an unmanned aerial vehicle (UAV) exceeds a first threshold at the neighboring cell. The neighboring cell transmits an uplink interference indicator to the UAV. In some examples, the UAV informs its serving cell of the uplink interference experienced by the neighboring cell. The serving cell can utilize information received from the UAV to make handover decisions or scheduling decisions for the UAV that caused the uplink interference. In other examples, the UAV can temporarily refrain from transmitting on at least some of its uplink resources or utilize different uplink resources for uplink data transmissions. In still other examples, the UAV can utilize downlink measurements to select which neighboring base station System Information Block messages should be monitored for an uplink interference indicator.

Abstract: A source user equipment (UE) device receives a neighbor list from each of a plurality of neighbor UE devices where each neighbor list identifies proximate UE devices that are within communication range of the neighbor UE device transmitting the neighbor list and including link information indicating a link quality of a communication link between the neighbor UE device and each proximate UE device in the neighbor list. The source UE device selects, from the plurality of neighbor UE devices, at least one candidate relay device for relaying destination device data to a destination UE device where the selection is at least partially based on the link quality information in the neighbor lists. The destination device data and a relay indicator are transmitted to the at least one candidate relay device. The indicator indicates that the at least one candidate device is to transmit the destination device data to the destination UE device.

Abstract: A relay (UE) receives, from a source UE device, a source transmission comprising destination device data and a relay indicator indicating that the destination device data is to be transmitted to a destination UE device. The relay UE device determines whether other communication data is pending transmission to another UE device over a device-to-device communication link. If other communication data is pending transmission, the relay UE device determines whether a destination data priority level of the destination device data is greater than another data priority level of the other communication data. The destination device data is transmitted to the destination UE device in accordance with the priority levels.

Abstract: A source user equipment (UE) device receives a neighbor list from each of a plurality of neighbor UE devices where each neighbor list identifies proximate UE devices that are within communication range of the neighbor UE device transmitting the neighbor list. The source UE device selects, from the plurality of neighbor UE devices, at least one candidate relay device for relaying destination device data to a destination UE device. The selection is at least partially based on the received neighbor lists. The destination device data and a relay indicator are transmitted to the at least one candidate relay device where the indicator indicates that the at least one candidate device is to transmit the destination device data to the destination UE device.

Abstract: The methods, devices, and systems discussed herein describe four different mechanisms (e.g., solutions) to assist a leader of a group of wireless communication devices in deciding when to switch between groupcast and unicast transmissions. In the first solution, the group leader may decide to initiate groupcast or unicast without considering the design of the Access Stratum (AS) layer link management. In the second solution, the group leader can determine whether to initiate unicast transmission based, at least partially, on feedback messages received from one or more other members of the group. In the third solution, the group leader has the option to simultaneously transmit groupcast and unicast transmissions towards the same user equipment devices (UEs). In the fourth solution, the group leader indicates to the groupcast-receiving UEs that the transmission is about to be switched from groupcast to unicast.

Abstract: A relay user equipment (UE) device transmits selected system information in a sidelink discovery message where the selected system information is a subset of system information received from a cell at the relay UE device. A remote UE device receiving the sidelink discovery message with the selected system information obtains at least system information for accessing the cell where such system information may not be available directly from the cell. The remote UE receiving select system information from each of a plurality of candidate relay UE devices manages relay selection/reselection at least partially based on the selected system information.

Abstract: User equipment, and an apparatus and method used in user equipment are perform a predetermined data transmission in which the user equipment transmits uplink user data when the user equipment is in an RRC inactive state. The user equipment, apparatus and method transmit a random access preamble for the predetermined data transmission to a base station during a random access procedure, and transmit an MSG 3 message together with uplink user data to the base station during the random access procedure. A base station performs a predetermined data transmission in which a user equipment transmits uplink user data when the user equipment is in an RRC inactive state, includes a receiver receiving a random access preamble for the predetermined data transmission during a random access procedure from the user equipment, and receives an MSG 3 message together with uplink user data from the user equipment during the random access procedure.

Abstract: Handovers in a New Radio-Unlicensed Standalone (NR-U SA) communication system are managed by invoking one of a plurality of handover procedures based on conditions related to the communication device and channel status. One example of one of the plurality of handover procedures includes sending a handover command with an inactivity indicator to the UE device where the UE device transitions to an Inactive State (such as RRC_INACTIVE) in response to a handover failure (HOF) resulting from an occupied unlicensed channel. The UE device provides the 1-RNTI allocated by the last serving gNB when resuming from the RRC_INACTIVE to the active state; thereby reducing the latency associated with a new connection from the idle mode. The target gNB uses the 1-RNTI to retrieve the UE context from the last serving gNB.

Abstract: A base station transmits a rate recommendation to a first user equipment (UE) device. The rate recommendation is to be used for a Voice over Long-Term Evolution (VoLTE) call between the first UE device and a second UE device. In some instances, the first UE device and the second UE device negotiate the rate to be used for the VoLTE call, based on the rate recommended by the base station. If the negotiated rate is supported by the base station and/or matches a supported codec rate, the UE devices implement the rate and provide rate feedback to the base station.

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: A communication control method is used in a mobile communication system for providing a multicast broadcast service (MBS) from a base station to user equipment, and includes receiving, by the base station from a core network or another base station, a specific Packet Data Convergence Protocol (PDCP) sequence number specified to be applied to an MBS packet; associating, by the base station, the MBS packet with the specific PDCP sequence number; and transmitting, by the base station to the user equipment, the MBS packet associated with the specific PDCP sequence number.

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: 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: In a first aspect, a communication control method is used in a cellular communication system. The communication control method includes transmitting, by a first relay node subordinate to a first donor base station, a first packet to a second donor base station different from the first donor base station. The communication control method includes forwarding, by the second donor base station, the first packet to the first donor base station by using a path for data forwarding, and transmitting, by the first donor base station, the first packet to a network.

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 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 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.