Abstract: Provided are a method and a device for performing a UE-based handover in a next generation wireless access network. The method of a UE may include receiving, from a source base station, an upper layer signaling including information on UE-based handover command and information on conditions for handover execution; storing a target cell configuration by using the information on conditions for handover execution; and determining whether to perform a handover procedure to a target cell, by determining whether predetermined conditions for handover are satisfied.

Abstract: Provided are a method for controlling mobility of a mobile communication terminal, and a device therefor. The method may include receiving a higher layer message including one or more pieces of candidate target cell configuration information for an L1/L2-triggered mobility (LTM) operation; receiving a medium access control control element (MAC CE) indicating performance of an LTM operation to a target cell; and performing a cell change operation to the target cell on the basis of the MAC CE, while controlling a preset MAC reset operation for the LTM operation to be performed.

Abstract: Provided are a method and device for controlling sidelink communication. The method may include receiving sidelink discontinuous reception configuration information, configuring the sidelink discontinuous reception configuration information in the terminal, and discontinuously monitoring a physical sidelink control channel (PSCCH) on the basis of discontinuous reception (DRX) parameters included in the sidelink discontinuous reception configuration information.

Abstract: Provided are a method and device for controlling a cell change operation of a mobile communication terminal The method may include receiving an upper layer message including one or more pieces of candidate target cell configuration information for an L1/L2-triggered mobility (LTM) operation; receiving a medium access control control element (MAC CE) instructing the execution of the LTM operation on a target cell; and performing a detach operation from a source cell on the basis of the MAC CE, and performing the cell change operation by applying the candidate target cell configuration information for the target cell.

Abstract: Proposed in the present disclosure are a method and an apparatus for providing a control plane procedure in a cell change operation for a mobile communication terminal. The present embodiments may provide an apparatus and a method by which a terminal performs a cell change operation, the method comprising the steps of: receiving a higher layer message including one or more candidate target cell configuration information for an L1/L2-triggered mobility (LTM) operation; receiving a medium access control element (MAC CE) instructing performance of the LTM operation to a target cell; and controlling an operation of a timer included in the upper layer message.

Abstract: Provided are a method and a device for controlling cell change. The method may includereceiving a higher layer message including one or more candidate target cell configuration information for an L1/L2-triggered mobility (LTM) operation; transmitting an L1 measurement result for a candidate target cell on the basis of the higher layer message; receiving a medium access control control element (MAC CE) indicating performance of an LTM operation to a target cell; and performing a cell change operation without RRC reconfiguration by applying the candidate target cell configuration information for the target cell on the basis of the MAC CE.

Abstract: Provided are a method and device for processing data. The method may include receiving higher layer signaling including packet data convergence protocol (PDCP) configuration information for configuring to perform a protocol data unit (PDU) Set-based discard operation, receiving a medium access control (MAC) control element indicating activation of a service data unit (SDU) discard operation based on PDU Set importance, and controlling a PDCP entity to start a PDU Set importance-based discard timer configured in association with the PDCP SDU when the SDU discard operation based on the PDU Set importance is activated, and a PDCP SDU belonging to the PDU Set importance of a preset criterion is received from a higher layer.

Abstract: Provided are a method and device for effectively processing application service data. The method of UE may include receiving an RRC message including information for configuring and transmitting a discard status report indicating a gap of a PDCP sequence number as a PDCP SDU is discarded, controlling to compile the discard status report in an event that the discard status report is triggered by discarding one or more PDCP SDUs, and transmitting the discard status report, and a device.

Abstract: Provided are apparatus and method for communication in a non-terrestrial network (NTN). The method may include: receiving, from a base station, HARQ process activation indication information indicating whether to activate an HARQ process operation; determining whether to perform the HARQ process operation for a downlink signal on the basis of information included in the downlink signal when the downlink signal is received from the base station if the HARQ process operation deactivation is configured by the HARQ process activation indication information; and transmitting, to the base station, feedback information for the downlink signal when performing the HARQ process operation for the downlink signal is determined.

Abstract: Disclosed is a terminal and a base station for communicating each other by using a non-terrestrial network (NTN). A method of a terminal may include the steps of receiving, from a base station, configuration information for cell changing or beam failure recovery, determining, by using the configuration information, whether a trigger condition for cell changing or beam failure recovery is satisfied, and performing a cell changing or beam failure recovery operation when the trigger condition is satisfied; and an apparatus.

Abstract: Provided are method and apparatus for controlling the mobility of a UE in a mobile communication system. The method may include receiving an RRC reconfiguration message including an L1/L2 triggered mobility (LTM) candidate cell configuration from a network node, transmitting a random access preamble to the LTM candidate cell based on a PDCCH order of a serving cell to perform an early synchronization operation for obtaining an uplink timing advance of an LTM candidate cell, receiving a MAC control element (CE) including a cell switch command from the serving cell, and performing a cell switching operation to a target cell based on the MAC CE.

Abstract: Provided are apparatus and method for processing MBS data. The method for receiving multicast/broadcast service (MBS) by a user equipment (UE) may include, when handover is determined, receiving, through a source base station, radio bearer configuration information for receiving MBS session data through a target base station, configuring a radio bearer for receiving the MBS session data through the target base station based on the radio bearer configuration information, and receiving the MBS session data through the radio bearer. The radio bearer configuration information is information generated by the target base station and transmitted to the source base station.

Abstract: Provided are a method of a base station for controlling transmission and reception of data through a network slice. The method includes: receiving network slice request information from a terminal in which a network slice is configured; controlling so as to deliver the network slice request information to a core network entity; and receiving, from the core network entity, specific network slice information configured on the basis of the network slice request information.

Abstract: Provided are a method and apparatus for controlling a multicast/broadcast service (MBS) session resource. The method of a target base station include receiving a handover request message from a source base station, controlling whether to configure a user plane resource for an MBS session of a terminal on the basis of a handover request message, and when it is determined to configure the user plane resource, transmitting a setup request message for user plane resource allocation for the MBS session to a core network entity.

Abstract: Provided is a method of a terminal for performing communication by using a non-terrestrial network (NTN). The method may include receiving, from a base station, HARQ operation activation indication information for indicating whether to activate an HARQ operation; configuring a HARQ process based on the HARQ operation enabling indication information; and identifying and controlling HARQ operations for a downlink signal according to whether the HARQ process configured whether to enable or disable the HARQ operation.

Abstract: Provided are a method and apparatus for controlling the mobility of a terminal in a non-terrestrial network. The method may include receiving handover request information for a handover of the terminal, from a source base station or a core network entity; reserving a radio resource for the handover of the terminal on the basis of the handover request information; and determining whether or not the reserved radio resource is to be released, by means of serving cell availability time information included in the handover request information.

Abstract: Provided are a method and a device for performing a UE-based handover in a next generation wireless access network. The method of a UE may include receiving, from a source base station, an upper layer signaling including information on UE-based handover command and information on conditions for handover execution; storing a target cell configuration by using the information on conditions for handover execution; and determining whether to perform a handover procedure to a target cell, by determining whether predetermined conditions for handover are satisfied.

Abstract: Provided are a method and a device for receiving multicast/broadcast service (MBS) data. The method may receiving an RRC message from a base station; configuring a data inactivity timer on the basis of the RRC message; and when an MAC entity receives an MBS Traffic channel (MTCH) MAC SDU for the MBS, starting or restarting the data inactivity timer.

Abstract: Provided are a method and apparatus for controlling a multicast/broadcast service (MBS) session in a NR-based mobile communication network. The method may include receiving, from a source base station, a handover request message including activation or inactivation state information about a MBS session, determining a wireless resource configuration for the MBS session on the basis of the activation or inactivation state information about the MBS session, and transmitting the wireless resource configuration through the source base station to the terminal.

Abstract: Provided are a method and a device for performing a UE-based handover in a next generation wireless access network. The method of a UE may include receiving, from a source base station, an upper layer signaling including information on UE-based handover command and information on conditions for handover execution; storing a target cell configuration by using the information on conditions for handover execution; and determining whether to perform a handover procedure to a target cell, by determining whether predetermined conditions for handover are satisfied.