A method and a device for handover in an EFB-based non-terrestrial network are provided. The method may be performed in a first cell of a first satellite. The method includes performing a connection configuration procedure with a UE. The method also includes, after performing the connection configuration procedure, decreasing a value of a cell service timer, that indicates the time at which a communication service can be provided in the first cell, according to a decrement interval. The method additionally includes, in response to determining that the cell service timer is below a threshold, triggering a handover procedure.

Apparatus and methods are provided for supervised L1/L2-triggered mobility (LTM) cell switch. In one novel aspect, supervised LTM is performed by the UEs. In one embodiment, an LTM timer is preconfigured for the supervised LTM procedure. The UE starts the LTM timer upon receiving the cell switch command and monitors the process with the LTM timer. When the LTM timer expires and the UE fails to switch to a target cell, a recovery procedure is triggered. In one embodiment, the UE sends LTM procedure success indication explicitly through a new RRC message, a MAC CE, or DCI; or implicitly indicated by a HARQ ACK for a first downlink transmission, a first PUSCH transmission, or a first UL transmission through a PUSCH/PUCCH. In one embodiment, the recovery procedure performs an RRC re-establishment, or performs a failure recovery before the RRC re-establishment.

The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. A method performed by a first node in a wireless communication system is provided. The method includes acquiring information related to at least one of trajectory prediction of user equipment, data usage prediction of the user equipment, quality of service and/or quality of experience prediction and/or reporting of a second node and/or a user equipment, or positioning of the user equipment, and performing a corresponding operation based on the information.

A beam switching method performed by a satellite user equipment (UE), includes: determining whether the UE needs to perform service beam switching; and performing the service beam switching based on a determination result. A beam switching method, performed by a base station, includes sending configuration information to a satellite user equipment (UE), wherein the configuration information comprises at least one of a candidate beam set or a candidate Bandwidth Part (BWP) set; wherein when the configuration information comprises the candidate beam set and the candidate BWP set, and when a candidate beam in the candidate beam set has a binding relation with a candidate BWP in the candidate BWP set, the configuration information further comprises the binding relation between the candidate beam and the candidate BWP.

In a communication system including at least an Integrated Access and Backhaul (IAB) donor connectable to a network, and an IAB node that is connected to the IAB donor and relays communication between a User Equipment (UE) and the IAB donor, the IAB donor transmits, to the IAB node as a destination and before relay processing is stopped, a message concerning stop of relay, the IAB node executes, based on reception of the message, processing for connection to another IAB donor connectable to the network before the IAB donor stops relay. The message concerning stop of the relay is different from a message that notifies a Backhaul Radio Link Failure (BH RLF).

This disclosure provides systems, methods, and devices for wireless communication that support enhanced management of recovery timers in a wireless communication system. In a first aspect, a method of wireless communication includes an apparatus determining whether a recovery timer is currently running, the apparatus being configured for multi-subscriber identity module (SIM) communications including a first subscription and a second subscription. The apparatus is further configured to tune away from the first subscription to the second subscription when the recovery timer is determined not to be currently running, and determine to forego tuning away from the first subscription to the second subscription when the recovery timer is determined to be currently running. Other aspects and features are also claimed and described.

A method for user equipment (UE) service handover from the serving cell to a target cell includes information regarding a handover timer and an associated handover execution condition. For scheduled handover to be performed upon expiration of the handover timer, the associated handover execution condition comprises one or more abort conditions for aborting the scheduled handover. For two-stage triggered handover to be performed upon receipt of a subsequent triggering message, the handover timer is a handover validity timer and the associated handover execution condition comprises receipt of the handover triggering message prior to expiration of the handover validity timer.

Aspects are described for a user equipment (UE) comprising a transceiver configured to enable wireless communication with a serving cell and a target cell and a processor communicatively coupled to the transceiver. The processor is configured to receive a handover command from the serving cell. The handover command comprises an epoch index and ephemeris information of the target cell. The processor is further configured to determine an epoch time of the target cell based on the epoch index and perform time synchronization with the target cell using the epoch time and the ephemeris information.

A technical solution is proposed, which allows mobility experience to be improved by properly tuning Cell Individual Offset (CIO) and/or Time-To-Trigger (TTT) parameters in a wireless communication network. More specifically, information about a number of Handover (HO) attempts made between a source network node and each of its neighboring network nodes for a predefined period of time and a number of occurrences of each type of HO problems during the HO attempts are collected as a data vector. Then, for each source network nodeneighboring network node pair, two data sub-vectors are obtained by aggregating the numbers from the data vector at a carrier level and an inter-node level, respectively. After that, the two data sub-vectors are used by an ensemble of two Machine-Learning models to predict whether the TTT and/or CIO parameters need to be changed.

In some embodiments, a method comprises blocking mobile devices from establishing new connections to a cell, ending existent connections of mobile devices to the cell gradually based on a shutdown procedure, and locking the cell after the shutdown procedure. The shutdown procedure is configured according to pre-defined parameters that indicate to end the existent connections based on at least one of a priority level of existent connections or an activity level of existent connections.