The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. According to an aspect of the embodiments of the present disclosure, a method for supporting handover is provided, comprising: receiving a message from a central unit control plane entity of a target base station; receiving a data packet from a source base station; and discarding a packet data convergence protocol (PDCP) service data unit (SDU) including the PDCP sequence number (SN) in the received data packet according to the indication of the message. The problem of coordinated work between the source base station and the target base station during the handover process may be solved. Especially when the source base station and/or the target base station support the separation of the control plane and the user plane, ensure that the central unit control plane entity of the source base station, the central unit user plane entity of the source base station, the central unit control plane entity of the target base station and/or the central unit user plane entity of the target base station may fully coordinately work.

Embodiments of the present application relate to methods and apparatuses for handling a conditional handover (CHO) condition in a non terrestrial network (NTN) environment. According to an embodiment of the present application, a method can include: receiving a radio resource control (RRC) reconfiguration message, wherein the RRC reconfiguration message includes CHO configuration information associated with one or more target candidate cells and a set of CHO execution conditions associated with the one or more target candidate cells; the condition can be based on a measurement result, a distance between a UE and a base station, an absolute time, a timer, a time advance, an elevation angle and the combination of them; evaluating one or more CHO execution conditions associated with each of the one or more target candidate cells; determining whether a CHO execution condition associated with a target candidate cell is satisfied; and in response to satisfying the CHO execution condition, performing a CHO procedure from a source cell to the target candidate cell.

A user equipment (UE) may establish a radio resource control (RRC) connection with a first cell of a cellular network and transmit signaling comprising an indication of enhanced radio link failure (RLF) recovery capability. The UE may receive one or more RRC messages comprising configuration information for RLF recovery on the first cell. The UE detect one or more RLFs corresponding to the first cell and further determine, via a connection reestablishment cell selection procedure, that the first cell is a suitable RLF recovery candidate cell. In response to the detection and determination, the UE may apply the configuration information for the first cell. The UE may then transmit signaling comprising a trigger indicating a RLF recovery to the cellular network and re-establish the RRC connection with the cellular network using the configuration information.

Methods, systems, and devices for wireless communications are described. Implementations described herein support prioritization of cells that are configured at the UE over neighboring cells (e.g., that are unconfigured) for cell reselection while the UE is in an inactive state. The UE may receive system information that indicates a cell reselection priority for evaluating a plurality of cells. The system information may indicate that the neighboring cell is assigned a higher priority than a cell of a master cell group or a cell of the secondary cell group that are configured at the UE. The UE may perform a cell reselection procedure that prioritizes reselection of the master cell group cell, the secondary group cell, or both over the neighboring cell and establish a connection with one of the plurality of cells based on a result of the cell reselection procedure.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may determine, via a first subscription of the UE, a trigger event for a conditional handover of the UE from a source network entity to a target network entity. The UE may determine, based at least in part on the trigger event, that a target band associated with the target network entity is not compatible with a serving band associated with a second subscription of the UE. The UE may store the trigger event for the conditional handover in a buffer of the UE. The UE may perform an action related to the conditional handover based at least in part on a condition being satisfied. Numerous other aspects are described.

The present disclosure relates to a failure recovery in wireless communications. According to an embodiment of the present disclosure, a method performed by a wireless device served by a master node (MN) and a secondary node (SN) in a dual connectivity (DC) in a wireless communication system comprises: receiving information for a timer related to a fast master cell group (MCG) recovery and a conditional mobility attempt configuration; starting the timer related to the fast MCG recovery upon detecting a MCG failure; and based on detecting an expiry of the timer related to the fast MCG recovery: removing one or more conditional mobility commands stored in the wireless device; and initiating a transmission of a radio resource control (RRC) re-establishment request message.

Provided in the present invention is a method performed by user equipment (UE), including: when the UE undergoes a dual active protocol stack (DAPS) handover failure during a DAPS handover, if no source base station radio link failure (RLF) is detected, the UE falling back to a source base station link, without generating and storing handover failure information for the DAPS handover failure in a link failure report; and if the UE, when falling back to the source base station link, detects a source base station RLF, the UE recording and storing link failure information for the source base station RLF in the link failure report.

The present disclosure relates to a communication method and system for converging a 5.sup.th-Generation (5G) communication system for supporting higher data rates beyond a 4.sup.th-Generation (4G) system with a technology for Internet of Things (loT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. Disclosed is a method by which a terminal collects information related to handover performance and efficiently reports the information to a base station.

A method for sending radio link failure (RLF) report includes: sending a CHO-related RLF report including at least one of: a result of signal measurement performed on a neighbor cell; a result of signal measurement performed on a candidate cell not meeting a handover execution/triggering condition; a list of candidate cells meeting the handover execution/triggering condition; a list of candidate cells not meeting the handover execution/triggering condition; an identifier of a first cell, where the first cell includes a cell where an RRC reconfiguration signaling is received; indication information of a handover execution condition type; a parameter corresponding to a configured handover execution condition; information used for indicating whether RLF occurs in the first cell until the CHO is performed; a length of time from receiving a CHO configuration to triggering the CHO; a handover type identifier.

A communication method for a terminal device includes receiving a conditional handover (CHO) command from a source network device. The communication method also includes selecting, by the terminal device, a cell in response to a radio link failure (RLF) in a source cell before the terminal device determines a target cell. The target cell is determined according to the CHO command. The communication method additionally includes sending first information to a network device. The first information includes a first parameter. The first parameter is related to a CHO failure caused by the RLF in the source cell.