A method is provided, including: configuring a conditional candidate primary secondary cell group cell PSCell addition or change for a terminal device; and performing, by a master network device, early data transmission oriented to a network device to which a candidate PSCell belongs, and for example, before the terminal device accesses the candidate PSCell, sending a data packet to the network device to which the candidate PSCell belongs, where a form of the data packet is a packet data convergence protocol protocol data unit, and the data packet includes a data packet on an MN terminated secondary cell group bearer and/or a data packet on an MN terminated split bearer. In this way, after the terminal device accesses a candidate network device, the candidate network device may send forwarded data to the terminal device, to reduce a data transmission delay.

The present disclosure proposes a method and a device for reporting information related to handover in a next generation mobile communication system. A method performed by a terminal in a wireless communication system according to an embodiment of the present disclosure may comprise the steps of acquiring configuration information related to dual active protocol stack (DAPS) handover, after execution of the DAPS handover is triggered on the basis of the configuration information, identifying failure in a radio link between the terminal and a source cell, and transmitting information on the failure in the radio link.

In a first aspect, a communication control method is used in a cellular communication system. The communication control method includes receiving, by a relay node, a flow control feedback message or a failure occurrence notification message from a parent node of the relay node. The communication control method includes executing, by the relay node, a conditional handover in response to a certain period elapsing after receiving the flow control feedback message or the failure occurrence notification message.

A user equipment (UE) can implement a method for managing mobility. The method includes operating in dual connectivity (DC) with a master node (MN) via a primary cell and a secondary node (SN) via a primary secondary cell, the MN and the SN operating in a radio access network (RAN) (1702). The method further includes receiving, from the RAN, a conditional configuration related to a candidate primary secondary cell, the conditional configuration associated with a condition to be satisfied before the UE applies the conditional configuration during a conditional procedure (1704). The method also includes detecting a secondary cell group (SCG) failure. Still further, the method includes, in response to the detecting, suspending the conditional procedure.

A method and apparatus for requesting conditional handover, a storage medium, a terminal and a base station are provided. The method includes: reporting conditional handover assistance information to assist a base station to determine whether a terminal adopts conditional handover; wherein the conditional handover assistance information indicates that the terminal requests conditional handover.

The invention concerns MR-DC (multi-radio dual connectivity) in which a UE is connected to a master node (MN) and secondary nodes (SN). In a Conditional PSCell Change (CPC)—i.e. a PS-Cell Change which is executed by the UE when an execution condition is met—a source secondary node, S-SN, may send a cancellation indication to a master node, MN, when said S-SN desires cancellation of a CPC configuration. Subsequently, the MN transmits a cancellation indication to the target candidate SNs configured with CPC.

Systems and methods are disclosed herein for handling Conditional Primary Secondary Cell (PSCell) Change (CPC) upon Secondary Node (SN) release. In one embodiment, a method performed by a Master Node (MN) for SN release for a User Equipment (UE) that is operating in Multi-Radio Dual Connectivity (MR-DC) and configured with CPC comprises determining that a SN for a UE that is operating in MR-DC and configured with CPC is to be released. The method further comprises, responsive to determining that the SN for the UE that is operating in MR-DC and configured with CPC is to be released, sending a first message to a target SN (T-SN) associated with a CPC configuration for the UE, the first message being indicative of a CPC cancellation, and sending a second message to the UE, the second message comprising an explicit or implicit indication that the UE is to release the CPC configuration.

A method of operating a master node includes determining to configure conditional PSCell addition or change (CPAC). A request is transmitted to a SN to prepare a conditional SN addition, a response therefrom confirms that a UE may be accepted unless a canceling message is later received. A RRC message is transmitted to the UE containing CPAC configurations for candidate target cell(s), where the RRC message contains condition(s) which the UE should monitor and message to be applied when condition fulfilled. Multiple MN or MCG related configurations are monitored for reception of messages from the UE. A message is received from the UE on one of the multiple MN or MCG related configurations monitored. The method detects which one of the multiple MN or MCG related configurations the UE has applied and responsively reconfigures the MN based on the detected one of the multiple MN or MCG related configurations.

The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. A base station and a method for supporting self-configuration and self-optimization are provided. The method includes sending, by a main node (MN), a secondary node (SN) addition request message to a target candidate SN, receiving, by the MN, an addition request acknowledgment message from the target candidate SN, sending, by the MN, a radio resource control (RRC) reconfiguration message to a user equipment (UE), receiving, by the MN, an RRC reconfiguration complete message from the UE, which is an RRC reconfiguration complete message sent by the UE after accessing a candidate secondary cell group primary cell (PS Cell), sending, by the MN, an SN release request message to a source SN, receiving, by the MN, an SN release request acknowledgment message from the source SN, wherein the release request acknowledgment message includes secondary cell group (SCG) UE history information, updating, by the MN, saved UE history information, sending, by the MN, UE history information to a target SN.

A method in a UE communicating with a RAN includes receiving (312A), from the RAN, a conditional configuration and a corresponding condition for a conditional procedure and, after receiving the conditional configuration and the corresponding condition, sending (316 A) UE information to the RAN. The UE information includes information indicative of a preference or circumstance of the UE. The method also includes, after sending the UE information to the RAN, determining (334A) that the corresponding condition is satisfied and, after determining that the corresponding condition is satisfied, again sending (320A) the UE information to the RAN.