Embodiments of this disclosure provide a serving node update method and a device. The method includes: sending a first message to a target node; receiving, from the target node, a second message used for responding to the first message; and sending a third message to a terminal device when the second message indicates that the target node rejects a multi-connectivity serving node update, where the third message is used to indicate the terminal device to perform a serving node update in a legacy serving node update manner.

A network device may receive an indication of movement of a user device, associated with multiple packet data unit (PDU) sessions, from a first radio access network (RAN) to a second RAN, and may maintain, based on the indication, a particular PDU session, of the multiple PDU sessions, associated with a default flow. The network device may release, based on the indication, the multiple PDU sessions other than the particular PDU session, and may handle the multiple PDU sessions, other than the particular PDU session, in accordance with a handling option.

Methods and systems for Radio Access Network (RAN) aggregation of multiple Radio Access Technologies (RATs). A method disclosed herein includes aggregating the RATs at a RAN level to provide at least one User Equipment (UE) with multi-connectivity. The method further includes enabling at least one Centralized unit (gNodeB-CU) within at least one RAN node to uniformly control Distributed Units (DUs) of different RATs (5G New Radio (NR) and Wireless Local Area Network (WLAN) RATs). The method further includes enabling the at least one gNB-CU to control the at least one UE and allow the at least one UE to connect with an additional RAT irrespective of an initial RAT, the UE is connected to. The method further includes controlling WLAN Access Point (AP) as a 5G distributed unit (gNB-DU).

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive physical-layer control information indicating to activate or deactivate a secondary cell; and activate or deactivate the secondary cell within a time period in accordance with the physical-layer control information, wherein the time period is based at least in part on a set of factors and based at least in part on the secondary cell being activated or deactivated by the physical-layer control information. Numerous other aspects are provided.

Method and apparatus for signaling enabling a state transition of a transmission mode. The apparatus measures at least one reference signal from a serving TRP to determine a link quality between the UE and the serving TRP. The apparatus transmits feedback including a state transition indication if the link quality between the UE and the serving TRP falls below a threshold. The feedback enables a state transition of a transmission mode.

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive, from a master node associated with a primary cell, a configuration for a conditional procedure for adding or changing a primary secondary cell (PSCell) associated with a secondary node. The UE may also receive, from the master node, a configuration for a handover procedure for the primary cell. The UE may transmit a report that includes information related to the conditional PSCell procedure, information related to the primary secondary cell, or both, based on a triggering order between the conditional PSCell procedure and the handover procedure.

Network configuration including: receiving, by a target primary eNB of user equipment, a handover request message transmitted by a source primary eNB of the user equipment, the handover request message containing identification indication information or service indication information of the user equipment in a serving eNB before handover.

A method of operating a Master gNodeB (MgNB) in a radio access network RAN is disclosed. An indication of a user plane security policy is received from a core network node, wherein the user plane security policy requires user plane integrity protection for a protocol data unit PDU session. Responsive to the user plane security policy requiring user plane integrity protection for the PDU session and responsive to determining that a secondary base station supporting the user plane security policy requiring user plane integrity protection is unavailable, a data radio bearer DRB of the PDU session is established directly between the MgNB and a user equipment UE. Related MgNBs are also discussed.

A method of adding a secondary cell group, a terminal device, and a main node are provided. The method of adding a secondary cell group includes: receiving conditional-addition SCG information sent by a master node; evaluating, according to the conditional-addition SCG information, whether one or more target cells in an SCG meet a condition corresponding to triggering addition of a target cell, and obtaining a result of the evaluation; triggering, according to the result of the evaluation, a process of adding a SCG target cell.

Embodiments of the present disclosure provide a wireless communication method, a terminal device, and a network device. The method is applied to a CA scenario, and there are at least one primary cell and at least one secondary cell for serving a terminal device. The method comprises: determining, by the terminal device, whether there is a candidate beam that satisfies a first condition among at least one candidate beam when a beam failure occurs in a first secondary cell, wherein the first condition is that at least one of RSRP, RSRQ, and SINR of a signal is greater than a first threshold, and the first secondary cell belongs to the at least one secondary cell; and determining, by the terminal device, whether to perform beam failure recovery for the first secondary cell according to a determination result.