Abstract: A communication control method for controlling a two-step random access procedure for completing a contention based random access procedure by performing transmission from user equipment to a base station and performing transmission from the base station to the user equipment after the transmission from the user equipment to the base station includes broadcasting, by the base station, system information indicating a PUSCH resource associated with a preamble resource, and receiving, by the user equipment, the system information. Performing the transmission from the user equipment to the base station includes transmitting, by the user equipment, a random access preamble to the base station, and using, by the user equipment, the PUSCH resource associated with the preamble resource used to transmit the random access preamble, based on the system information, to transmit a control message to the base station.

Abstract: In a first aspect, a cell reselection method is performed by a user equipment in a mobile communication system. The cell reselection method includes: receiving, from a network, slice frequency information indicating a plurality of frequencies and a network slice group supported by each of the plurality of frequencies; and when a predetermined frequency not supporting a predetermined network slice group, of which an AS layer is notified by a NAS layer of a user equipment, is present in the slice frequency information, performing control in which a cell belonging to the predetermined frequency is less likely to be selected as a serving cell than a cell belonging to a frequency supporting the predetermined network slice group.

Abstract: The devices, systems, and methods discussed herein facilitate the transition of a remote user equipment (UE) device from an indirect path of communication with a base station to a direct path of communication with the base station. More specifically, a relay UE device transmits, to a remote UE device that is indirectly communicating with a base station via the relay UE device, a message indicating that the quality of a communication link between the relay UE device and the base station is below a threshold. In response to receiving the message, the remote UE device transmits a measurement report to the base station. In some examples, the remote UE device starts a timer upon transmission of the measurement report to the base station. In these examples, the timer is used to control the frequency with which the remote UE device transmits additional measurement reports to the base station.

Abstract: A communication control method according to one embodiment is a method in a mobile communication system. The communication control method includes receiving, by a user equipment in an RRC connected mode, an RRC release message from a base station with a condition for releasing or suspending an RRC connection, performing, by the user equipment, data communication with the base station until the condition is met even in a case of receiving the RRC release message, and transitioning, by the user equipment, to an RRC idle mode or an RRC inactive mode when the condition is met.

Abstract: In a first aspect, a communication control method includes receiving, by a relay node, a packet in an upstream direction, and performing, by the relay node, routing processing for the packet, based on routing configuration information including a plurality of routing IDs. The performing of the routing processing includes, when an egress backhaul link corresponding to a routing ID matching destination information included in a BAP header of the packet is unavailable, performing inter-donor-DU re-routing for the packet.

Abstract: In a first aspect, a communication method is used in a mobile communication system for providing a multicast and broadcast service (MBS), the communication method including transmitting, by a first base station, a paging message to a second base station over an inter-base station interface, the paging message requesting paging of a user equipment having joined a multicast session and including an MBS session identifier for identifying the multicast session.

Abstract: A mobile wireless communication user equipment device (mobile device) simultaneously stores logs for two minimization drive tests (MDTs) where a first MDT is associated with a first radio access technology (RAT) and a second MDT is associated with a second RAT. The mobile device logs MDT data for both MDTs to generate two MDT logs. In response to a request, the mobile device transmits a requested MDT log where the MDT log may be transmitted to a base station of a RAT different from the RAT of the MDT log.

Abstract: In a first aspect, a communication control method is used in a cellular communication system. The communication control method includes causing a relay node to be configured with a BAP address of the relay node in a respective one of topologies from a donor node, receiving, by a BAP layer of the relay node, a packet, and when the BAP address of the relay node in the respective topology associated with an ingress backhaul RLC channel of the packet matches a destination BAP address included in a header of the packet, outputting, by the BAP layer, the packet to an upper layer.

Abstract: In a first aspect, a communication control method is a communication control method in a user equipment. The communication control method includes: transmitting, to a core network apparatus, information indicating a plurality of network slices desired by a user equipment; and receiving, from the core network apparatus, information indicating a priority of each of the plurality of network slices.

Abstract: In a first aspect, a communication method is performed by a user equipment in a radio resource control (RRC) idle state or an RRC inactive state in a mobile communication system supporting a multicast and broadcast service (IBS). The communication method includes the steps of receiving system information (SI) scheduling information broadcast by a neighboring cell belonging to a desired IBS frequency associated with a desired IBS service, and prioritizing the desired MBS frequency over other frequencies in the cell reselection procedure when the SI scheduling information indicates that the neighboring cell has a capability of providing an MBS system information block.

Abstract: In a first aspect, a communication control method is used in a cellular communication system. The communication control method includes: transmitting, by a donor node to a relay node, an F1AP message for configuring a buffer size threshold value; receiving, by the relay node, flow control feedback; triggering, by the relay node, local rerouting when an available buffer size included in the DL flow control feedback is equal to or less than the buffer size threshold value; and transmitting, by the relay node, data to another relay node on an alternative path.

Abstract: In an aspect, a communication method is performed in a user equipment in an RRC idle state or an RRC inactive state. The communication method includes: specifying, as a candidate cell for cell reselection, a cell belonging to a frequency supporting a selected network slice group selected in accordance with a priority provided by a NAS layer; and determining whether the candidate cell supports the selected network slice group. The determining includes: receiving a system information block from a serving cell of a user equipment for each of a plurality of network slice groups, the system information block including information indicating an identifier of the network slice group and a cell identifier of a cell that does not support the network slice group; and determining whether the candidate cell supports the selected network slice group, based on the information.

Abstract: A communication control method includes: configuring, for a relay node, dual connectivity in which a first parent node managing a master cell group is a master node and a second parent node managing a secondary cell group is a secondary node; transmitting, by the relay node, a first notification to a child node when a radio link failure is detected in one of a first backhaul link between the relay node and the first parent node and a second backhaul link between the relay node and the second parent node, the first notification indicating detection of the radio link failure; and transmitting, by the relay node, a second notification to the child node when recovery from the radio link failure occurs after transmitting the first notification, the second notification being transmitted after transmitting the first notification and indicating recovery from the radio link failure.

Abstract: A communication control method according to one embodiment is a method in a mobile communication system. A communication control method includes predicting, by a user equipment in an RRC connected mode, in a case where the user equipment determines that there is no data to be communicated with a base station, a duration for which a state in which there is no such data persists, and transmitting, by the user equipment, a control signal to the base station, the control signal including an indicator identifying the duration that is predicted.

Abstract: In a first aspect, a communication method is a communication method performed by a user equipment in a mobile communication system that provides a multicast and broadcast service (MBS) and includes receiving MBS data from a base station via a multicast radio bearer (MRB), receiving, from the base station, a radio resource control (RRC) reconfiguration message indicating a bearer type change of the MRB, triggering transmission of a PDCP status report indicating a data reception status in a PDCP entity associated with the MRB in response to the bearer type change indicated by the RRC reconfiguration message being a change to an Acknowledged Mode (AM) MRB type, and transmitting the PDCP status report to the base station.

Abstract: In a first aspect, a communication method is a method performed by a user equipment that receives, from a base station, a series of PDCP data PDU constituting multicast and broadcast service (MBS) data. The communication method includes receiving, from the base station, a hyper frame number that is counted up every time a sequence number included in a PDCP data PDU transmitted by the base station makes one round, and determining an initial value of a PDCP state variable managed by the user equipment from the hyper frame number and a PDCP sequence number included in the PDCP data PDU received by the user equipment from the base station.

Abstract: A communication control method is used in a user equipment in a cell operated in an unlicensed band. The communication control method comprises performing, by the user equipment, Listen Before Talk (LBT) before preforming transmission in the cell; determining, by the user equipment, whether the number of the LBT failure reaches a threshold; and when determining that the number of the LBT failure reaches the threshold, performing, by the user equipment, transmission in another cell in which the number of the LBT failure does not reach the threshold.

Abstract: A handover control method for performing a conditional handover of a user equipment from a source cell to a target cell, the source cell to which the user equipment connects. The handover control method comprises transmitting, by a source base station which manages the source cell to the user equipment, a RRC message including a list of candidate cells which are candidates for the target cell and a handover condition specified for each of the candidate cells in the list; and starting, by the source base station, transfer of a copy of downlink data of the user equipment to a candidate base station which manages the candidate cell in the list before the user equipment performs the handover.

Abstract: A handover control method according to a first aspect is a method for performing conditional handover of user equipment from a source cell to which the user equipment is connected to a target cell. The handover control method includes receiving, by the user equipment, from the source cell, a handover command for the conditional handover, detecting, by the user equipment, connection failure after receiving the handover command, and transmitting, by the user equipment, to a cell to which the user equipment is connected, a report message including information regarding the connection failure in the conditional handover.

Abstract: The communication control method includes making, by a first communication node including a relay node under the first communication node, an inquiry about cell IDs available in the relay node to a second communication node. The communication control method includes, in response to the inquiry, by the second communication node, determining a cell ID not colliding with the cell ID available in the second communication node from among the cell IDs available in the relay node, and transmitting the determined cell ID to the first communication node. The communication control method includes transmitting, by the first communication node, the determined cell ID to the relay node. The communication control method includes executing, by the relay node, movement processing by using the determined cell ID.