Methods, systems, and apparatuses are provided for deriving cell reference location in a wireless communication system. A method for a UE in the wireless communication system can comprise receiving information of a first reference location of a cell, receiving an assistance information associated with the cell, deriving and/or acquiring a second reference location of the cell based on at least the assistance information, and using the second reference location of the cell to evaluate a location-based event or measurement.

An operation method of a terminal in a communication system may comprise: receiving a first occurrence reporting condition of a handover problem from a source base station; performing a handover from the source base station to a target base station; identifying whether a handover problem occurs based on the first occurrence reporting condition while performing the handover; and in response to identifying that a handover problem occurs, transmitting information indicating the occurrence of the handover problem to the target base station.

Embodiments of the present application are directed to a method and apparatus for reporting time information of conditional handover (CHO). In an embodiment of the present application, the method includes: receiving configuration information on CHO, and transmitting time information of CHO in response to at least one failure that occurs during a CHO procedure.

A method includes receiving a first message from a first master node. The first message includes an identifier of a first candidate primary secondary cell (PSCell) or an identifier of first configuration information of the first candidate PSCell. The first candidate PSCell is included in both a first PSCell list and a second PSCell list. Alternatively, the first message includes delta configuration information of a second candidate PSCell in the second PSCell list. The first configuration information of the first candidate PSCell includes an addition/change condition and a configuration of the first candidate PSCell. The first PSCell list includes one or more candidate PSCells configured by the first master node for a terminal. The second PSCell list includes one or more candidate PSCells configured by a second master node for the terminal. The method also includes adding a target PSCell or changing from an original PSCell to the target PSCell.

The present disclosure provides an information transmission method, an information reception method and apparatuses. The information transmission method includes: recording, by a UE, information related to CHO and/or CPC; and transmitting, by the UE, the information related to the CHO and/or CPC to a network.

This disclosure relates to techniques for performing consecutive conditional handovers. A cellular base station may provide conditional handover information for multiple conditional handovers to a wireless device. The conditional handover information may include information for performing a conditional handover from a cell provided by the cellular base station to at least one cell, and information for performing a conditional handover from one or more of those cells to at least one cell. The wireless device may perform multiple consecutive conditional handovers using the conditional handover information.

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.

The present application is related to a method and apparatus for performing a mobility robustness optimization (MRO) mechanism in a handover procedure of a UE under 3GPP 5G New Radio (NR) technology. A method for wireless communication performed by a UE includes: upon a failure associated with a serving cell of a BS, performing a cell selection procedure to select a cell of another BS, wherein the failure is one of a radio link failure (RLF), a handover (HO) failure, and a conditional handover (CHO) failure; if the selected cell of the abovementioned another BS is not associated with the CHO configuration, performing a RRC re-establishment procedure; if the selected cell of the abovementioned another BS is associated with the CHO configuration, performing a CHO procedure; upon another CHO failure during the CHO procedure, performing a RRC re-establishment procedure; and after entering into a connected state with the abovementioned another BS, transmitting a RLF report to the abovementioned another BS, wherein the RLF report includes both information related to the failure and information related to the abovementioned another CHO failure.

The present disclosure provides a measurement method, a measurement configuration method, a user equipment and a network device. The method includes: receiving measurement object configuration information; when adopting conditional trigger cell management, according to the measurement object configuration information, starting measurement of a target object; wherein the target object is at least one of objects indicated by the measurement object configuration information; when satisfying a preset trigger event, determining whether to stop measurement of at least one object in the target object.

A condition-based method and device for adding a Secondary Node (SN) or a Primary Secondary Cell (PSCell) are provided. In the method, configuration information for adding an SN/PSCell is received. An SN/PSCell is added using the configuration information for adding an SN/PSCell. The configuration information for adding an SN/PSCell includes at least one of: addition condition configuration information of the SN/PSCell; and configuration information of the SN/PSCell. The embodiments of the present disclosure may realize condition-based SN addition or PSCell addition.