This application discloses a communication method and apparatus. A master base station sends, to a candidate secondary base station, a first message including an identifier of each candidate PSCell in a first candidate PSCell list and a first identifier corresponding to each candidate PSCell. The master base station receives, from the candidate secondary base station, a second message including an identifier of each candidate PSCell in a second candidate PSCell list, a first identifier corresponding to each candidate PSCell, and radio resource configuration information corresponding to each candidate PSCell, where the first candidate PSCell list includes the second candidate PSCell list. The master base station sends, to a terminal, a third message including the identifier of each candidate PSCell in the second candidate PSCell list, the first identifier corresponding to each candidate PSCell, and the radio resource configuration information corresponding to each candidate PSCell.

A communication method and a communication apparatus. The method includes recording first information after a terminal device is successfully handed over from a first network device to a target network device, and recording second information after a connection between the terminal device and the target network device fails.

The disclosure relates to a 5th generation (5G) or 6th generation (6G) communication system for supporting a higher data transmission rate. A method performed by a first base station in a wireless communication system is provided. The method incudes transmitting, to a second base station, a secondary node addition request message including information regarding a number of conditional reconfiguration allowed to the second base station, and receiving, from the second base station, a secondary node addition request acknowledge message, wherein the information regarding the number of conditional reconfiguration allowed to the second base station is used to provide configuration information for a condition reconfiguration between a user equipment (UE) and the second base station.

Methods and apparatuses a joint operation of conditional handover and conditional PSCell addition or change in a wireless communication system. A method of a UE comprises: receiving information including association information, execution conditions, and configurations for candidate PCells and candidate PSCells; evaluating the execution conditions for the candidate PCells and associated candidate PSCells simultaneously; upon the execution conditions for (i) a candidate PCell among the candidate PCells and (ii) a candidate PSCell associated with the candidate PCell are satisfied, determining that the candidate PCell and the associated candidate PSCell as a target PCell and an associated target PSCell, respectively; applying the configurations for the target PCell and the associated target PSCell; performing a random access procedure for the target PCell; and performing a random access procedure for the associated target PSCell.

The disclosure relates to a 5.sup.th generation (5G) or 6.sup.th generation (6G) communication system for supporting a higher data transmission rate. A method and an apparatus for conditional primary secondary cell group (SCG) (PS)cell change in a next generation mobile communication system are provided. According to an embodiment of the disclosure, a method performed by a user equipment (UE) in a wireless communication system is provided. The method includes receiving radio resource control (RRC) reconfiguration message including conditional reconfiguration information, performing a conditional reconfiguration procedure based on first variable related to the MN, and performing the conditional reconfiguration procedure based on second variable related to the SN.

A wireless communication device is configured for use in a wireless communication system. The device in this regard is configured to receive a command that commands the device to perform a link switch from a source link to a target link responsive to fulfillment of a condition. The command may indicate a target link configuration relative to a source link configuration. The device is also configured to store information from which the target link configuration indicated by the command is determinable irrespective of any change to the source link configuration occurring after receipt of the command. In some embodiments, the device is configured to, responsive to fulfillment of the condition, perform a link switch from the source link to the target link using the target link configuration as determined from the stored information.

A computer implemented method (200) is disclosed for managing Conditional Handover of a UE in a cellular communication network. The method comprises receiving a report of radio resource measurements performed by a UE (210) and assigning a current radio location of the UE to a radio zone of the communication network on the basis of the contents of the report (220). A radio zone comprises a region of a multidimensional radio space over which the communication network extends that is defined by a particular combination of radio field characteristics (220a). Each cell of the communication network comprises a plurality of radio zones. The method further comprises updating, in a database, a trajectory of the UE through the radio space of the communication network with the radio zone to which the current radio location of the UE is assigned (230), and using the updated trajectory to calculate a probability of Handover of the UE to neighbor cells of the current serving cell of the UE (240). The method further comprises initiating a Conditional Handover procedure for Handover of the UE to neighbor cells for which the probability of Handover is above a first Handover threshold value (250).

Aspects of the present disclosure provide techniques for configuring and triggering conditional handover for UE mobility between a direct connection to the base station (Uu connection) and/or a relay connection (PC5 connection). Specifically, the conditional handover configuration may include preparing multiple candidate relay UEs for handover (e.g., from Uu connection to PC5 connection) and conditional handover execution criteria for relay selection (or reselection) for the UE. Similarly, features of the present disclosure provide techniques for conditional handover transition from a PC5 connection back to Uu connection when conditional handover execution criteria are met (e.g., sidelink signal strength between the two UEs falls below a channel condition threshold). Additionally, the techniques provided herein support for conditional handover of the relay UEs from a first base station to a second station while the relay UE is further supporting one or more remote UEs.

An apparatus for receiving and transmitting signals, applicable to an integrated access and backhaul (IAB) node, includes a first receiver configured to receive a first reconfiguration message, and a first transmitter configured to transmit indication information to a radio device, the indication information being used to indicate that the radio device applies configuration in a second reconfiguration message.

Methods and apparatuses for enhanced conditional PCell/PSCell addition and changes in a wireless communication system. A method of a UE comprises: receiving reservation information including an indication; determining, based on the indication, whether a candidate PCell/PSCell is reserved; storing, based on a determination that the candidate PCell/PSCell is reserved, the reservation information, CG information and one or more execution conditions associated with the reserved PCell/PSCell; retrieving, after performing a first UE operation, the stored CG information and one or more execution conditions associated with the reserved PCell/PSCell; determining whether one or more execution conditions are met for a reserved PCell/PSCell; and upon determination that one or more execution conditions are met, applying the stored the CG information of the reserved PCell/PSCell to a second UE operation.