Abstract: A method for small data transmission (SDT) in RRC_INACTIVE state and related devices are provided. The method includes receiving a first SDT Timing Advance Command Media Access Control (MAC) Control Element (CE) from the network; starting or restarting Timing Alignment Timer (TAT) upon the reception of a Timing Advance (TA) command carried by the first SDT Timing Advance Command MAC CE, for keeping uplink (UL) time alignment during SDT in RRC_INACTIVE state; and when UL data arriving in UE TX buffer, transmitting SDT to the network while the TAT is running. With this method, UL synchronization/timing maintenance in RRC_INACTIVE state is realized.

Abstract: A user equipment (UE) executes a cell measurement method to shorten the time from radio link failure to reconnect to a telecommunication network. The UE detects at least one of a plurality triggering events for neighbor cell measurements associated with evaluating of the signal quality of the reference signals in the narrowband downlink channel in the serving cell. The UE performs neighbor cell measurements on reference signals in a narrowband downlink channel in one or more neighbor cells in a cell measurement period in response to the at least one of a plurality triggering events. The neighbor cell measurements are performed before radio link failure (RLF) associated with the user equipment. The UE selects at least one target cell among the one or more neighbor cells through the neighbor cell measurements and performs a cell reestablishment procedure.

Abstract: A method for small data transmission (SDT) in RRC_INACTIVE state and related devices are provided. The method includes receiving a SDT configuration, which is used for configuring SDT UL grant, wherein the SDT configuration comprises a SDT threshold; based on the SDT threshold, determining which type of SDT procedures is to be applied in RRC_INACTIVE state; upon reception of a Timing Advance (TA) command in the RRC_INACTIVE state, applying the TA command, and starting or restarting Timing Alignment Timer (TAT) for keeping uplink (UL) time alignment during SDT in the RRC_INACTIVE state; and applying the determined SDT procedure based on the started or restarted TAT, wherein the SDT configuration and/or the SDT UL grant is sustained even if the TAT expires. With this method, UL synchronization/timing maintenance in RRC_INACTIVE state is realized.

Abstract: A method of avoiding survival time (ST) failure, a user equipment (UE) and a base station (BS) are provided. The method includes being configured with pre-allocated radio resource by a base station (BS); transmitting data on an uplink configured grant; and entering a survival state and activating Packet Data Convergence Protocol (PDCP) duplication on the pre-allocated radio resource to retransmit the data. By performing the PDCP duplication, the UE could recover the failed transmission within the requirement of ST and avoid the application shutdown.

Abstract: A method for small data transmission (SDT) in RRC_INACTIVE state and related devices are provided. The method includes receiving a Radio Resource Control (RRC) release message used for providing SDT configuration, and a first timing advance (TA) command transmitted along with the RRC release message; applying the first TA command upon the reception of the RRC release message; and starting or restarting Timing Alignment Timer (TAT) upon the reception of the first TA command transmitted along with the RRC release message, for keeping uplink (UL) time alignment during SDT in RRC_INACTIVE state. With this method, UL synchronization/timing maintenance in RRC_INACTIVE state is realized.

Abstract: A user equipment (UE) executes a semi-static channel access method during a random access procedure in an unlicensed band. A base station transmits configuration information and downlink (DL) information to the UE in a fixed frame period (FFP) according to a set of FFP parameters associated with the base station. The UE determines whether to initiate a channel occupancy time (COT) in an FFP according to a set of FFP parameters associated with the UE based on one or more of: at least one condition in the configuration information, at least one condition in scheduling information, at least one condition in DL information, and a detection result of detecting transmission of the DL information. The base station determines whether to use the UE-initiated COT shared from the UE.

Abstract: An apparatus and a method of wireless communication for multicast and broadcast service (MBS) are provided. The method for MBS by a user equipment (UE) includes transmitting a UE assistance information to a source cell and/or a target cell for cell reselection, receiving a group notification from the source cell and/or the target cell, wherein the group notification is transmitted based on a 5G multicast and broadcast service (5MBS) service continuity (SC) request and a 5MBS response between the source cell and the target cell, and receiving an MBS data transmission via a specific bearer type from the source cell and/or the target cell based on an MBS reliability requirement, wherein the MBS data transmission is transmitted via a multicast radio bearer (MRB) which is multiplexed with a unicast data.

Abstract: An apparatus and a method of wireless communication for multicast and broadcast service (MBS) are provided. The method for MBS by a user equipment (UE) includes being configured, from at least one of a first base station, a second base station, or a third base station, with a shared-5G multicast and broadcast service network (S-5MBSN) information in a S-5MBSN before a cell reselection and receiving, from the at least one of the first base station, the second base station, or the third base station, an MBS data in the S-5MBSN during a UE mobility, wherein the S-5MBSN is shared by an inter-cell, an inter node, and/or multiple public land mobile networks (PLMNs), the S-5MBSN provides a same 5MBS session/content, and the same 5MBS session/content is scheduled by the inter-cell, the inter node, and/or the multiple PLMNs independently.