The present application retransmits the LTM random access-less cell switch completion information based on a scheduling method, and provides an information retransmission mechanism applicable to the LTM cell switch process, which can improve the transmission reliability of the LTM random access-less cell switch completion information, thereby reducing LTM cell switch failures and/or reduce service interruption delays.

A method performed by a user equipment (UE) in a wireless communication system is provided. The method includes receiving, from a base station, layer 1/layer 2 triggered mobility (LTM) configuration information including a configuration for at least one candidate cell via a radio resource control (RRC) message, wherein the configuration includes information associated with UE-based timing advance (TA) measurement configured for a candidate cell, identifying that the UE-based TA measurement is configured for the candidate cell of the at least one candidate cell, based on the information, receiving, from the base station, a medium access control (MAC) control element (CE) indicating a LTM cell switch, the MAC CE including first information indicating a configuration identity (ID) of the candidate cell for the LTM cell switch and second information on a timing advance command, identifying whether a valid timing advance (TA) value is indicated based on the timing advance command, and in case that the valid TA value is indicated based on the timing advance command, applying the TA value for the LTM cell switch to the candidate cell.

Techniques to configure a user equipment (UE) for a multi-connectivity handover with a source base station (SBS) and a target base station (TBS) include encoding a measurement report for transmission to the SBS. The measurement report is triggered based on a measurement event configured by the SBS. Radio resource control (RRC) signaling from the SBS is decoded, the RRC signaling including a handover command in response to the measurement report. The handover command includes an indication for multi-connectivity support by the SBS and the TBS during the handover. A first protocol stack associated with the SBS and a second protocol stack associated with the TBS are configured at the UE. A packet data convergence protocol (PDCP) protocol data unit (PDU) received at the UE during the handover is processed using the first protocol stack or the second protocol stack.

A communication system includes: a master base station operating as a master node of dual connectivity in which a communication terminal simultaneously connects to two base stations; and a secondary base station operating as a secondary node of the dual connectivity, and in a case where a second connection destination change process is required while executing a first connection destination change process in which a communication terminal changes a master node as a connection destination or a process in which a communication terminal changes a secondary node as a connection destination, the second connection destination change process being a process not falling under the first connection destination change process out of a process in which the master node is changed and a process in which the secondary node is changed, the second connection destination change process is started and the first connection destination change process is canceled.

Techniques are described for communicating datasets, between wireless devices and network nodes, to train artificial intelligence (AI) and/or machine learning (ML) models, which can be used in both training and inference stages, to improve system performance. An example method for wireless communication includes receiving, by a wireless device, a dataset from a network node, wherein the dataset comprises a plurality of data samples and is associated with a first information. In another example, the example method further includes transmitting, to the network node, a request for the dataset.

A random access channel (RACH)-less conditional cell switch is provided. A user equipment (UE) receives and stores a candidate cell configuration including an execution condition of a conditional cell switch to the candidate cell. The UE selects the candidate cell as a target cell for the conditional cell switch on determination that the execution condition is met. The UE determines whether a valid timing advance (TA) and a valid uplink (UL) grant for initial UL transmission to the target cell is available. When a valid TA and a valid UL grant are available, UE transmits initial UL transmission to the target cell using the valid TA and the valid UL grant. When a valid TA is unavailable, the UE performs random access procedure to the target cell. When a valid UL grant is unavailable, the UE transmits a scheduling request to the target cell.

An example technique is provided for receiving, by a target base station (BS) from a source BS, information identifying a source cell or the source BS, and a first time advance value used by the user device to transmit signals to the source BS, receiving a signal by the target BS that was transmitted from the user device based on the first time advance value, determining, by the target BS based upon the first time advance value and the received signal from the user device, a second time advance value to be used by the user device to transmit data to the target BS, sending the second time advance value from the target BS to the source BS, receiving, by the target BS, a handover of the user device from the source BS to the target BS, and receiving data by the target BS from the user device based on the second time advance value.

A method and apparatus may include receiving a time-alignment value for a time-alignment timer. The method may also include starting the time-alignment timer. The method may also include transmitting one or more uplink transmissions. The uplink transmission is transmitted while the time-alignment timer is running. The method may also include receiving an updated time-alignment while the time-alignment timer is running, if the timing of the uplink transmission is determined to be correct. The method may also include applying the updated time-alignment, if the updated time-alignment is received. The method may also include stopping uplink transmissions, if no updated time alignment is received.

Embodiments of Evolved Node-B (eNBs), user equipment (UE) and methods for licensed shared access (LSA) handover are generally described herein. An eNB includes hardware processing circuitry to receive a command to release spectrum resources in a LSA band over which the eNB serves an LSA cell; to determine whether user equipment (UEs) served by the eNB are permitted to skip a random access process (RAP) to be handed over to a target cell operating on a band separate from the LSA band; and to transmit a message to a UE served by the eNB instructing the UE that the UE is to be handed over to the target cell, the message including one or more indicators based on the determination. Other apparatuses, systems and methods are also disclosed.

The present disclosure relates to a user equipment (UE) that comprises a receiver of the UE receives, from a source base station of a source radio cell, a common timing advance value for a target radio cell. The UE is connected to the source radio cell and is involved in a handover procedure to hand over the UE from the source radio cell to the target radio cell. Further, the common timing advance value is received from the source base station in a first message of the handover procedure, which also comprises a timing indication for transmitting a second message from the UE to the target base station. Then, a processor of the UE determines a first uplink timing of uplink transmissions to the target base station with respect to downlink transmissions from the target base station, based on the received common timing advance value and the timing indication. A transmitter of the UE transmits a second message of the handover procedure to the target base station based on the determined uplink timing. The processor determines a UE-specific timing advance value, specific to the UE and the target radio cell, to be used by the UE for performing uplink transmissions in the target radio cell.