Abstract: A method and apparatus are disclosed. In an example from the perspective of a User Equipment (UE), the UE receives, from a first cell, a first signaling indicative of one or more random access resources of a second cell. The UE receives, from the first cell, a second signaling indicative of switching a Special Cell (SpCell) of the UE to the second cell, wherein the second signaling comprises at least one of a Physical Downlink Control Channel (PDCCH) signaling or a Medium Access Control (MAC) Control Element (CE). The UE initiates a random access procedure on the second cell in response to receiving the second signaling, wherein the random access procedure is performed by the UE using the one or more random access resources.

Abstract: A method and apparatus are disclosed. In an example from the perspective of a User Equipment (UE), the UE receives one or more signals indicative of a first Physical Uplink Shared Channel (PUSCH) and a second PUSCH on a first cell and in a Transmission Time Interval (TTI). The UE determines to transmit a first Uplink Control Information (UCI) in the TTI, wherein the first UCI overlaps with the first PUSCH and the second PUSCH in time domain. The UE selects the first PUSCH for multiplexing the first UCI based on whether the UE is configured with joint Hybrid Automatic Repeat Request (HARQ) feedback mode or separate HARQ feedback mode. The UE transmits the first PUSCH and the second PUSCH on the first cell, wherein the first PUSCH transmitted on the first cell includes the first UCI.

Abstract: A method and apparatus are disclosed. In an example from the perspective of a User Equipment (UE), the UE provides information related to multiple Universal Subscriber Identity Modules (USIM) of the UE to a first network.

Abstract: A method and apparatus are disclosed. In an example from the perspective of a User Equipment (UE), the UE receives one or more signals indicative of a first Physical Uplink Shared Channel (PUSCH) and a second PUSCH on a first cell and in a Transmission Time Interval (TTI). The UE determines to transmit a first Uplink Control Information (UCI) in the TTI, wherein the first UCI overlaps with the first PUSCH and the second PUSCH in time domain. The UE selects the first PUSCH for multiplexing the first UCI based on whether the UE is configured with joint Hybrid Automatic Repeat Request (HARQ) feedback mode or separate HARQ feedback mode. The UE transmits the first PUSCH and the second PUSCH on the first cell, wherein the first PUSCH transmitted on the first cell includes the first UCI.

Abstract: A method and apparatus are disclosed. In an example from the perspective of a User Equipment (UE), the UE receives one or more signals indicative of a first Physical Uplink Shared Channel (PUSCH) and a second PUSCH on a first cell and in a Transmission Time Interval (TTI). The UE determines to transmit a first Uplink Control Information (UCI) in the TTI, wherein the first UCI overlaps with the first PUSCH and the second PUSCH in time domain. The UE selects the first PUSCH for multiplexing the first UCI based on whether the UE is configured with joint Hybrid Automatic Repeat Request (HARQ) feedback mode or separate HARQ feedback mode. The UE transmits the first PUSCH and the second PUSCH on the first cell, wherein the first PUSCH transmitted on the first cell includes the first UCI.

Abstract: A method and apparatus are disclosed. In an example from the perspective of a User Equipment (UE), a signal to configure the UE to perform a Random Access Channel-less (RACH-less) handover to a second cell may be received in a first cell. The signal may comprise an uplink (UL) grant to be used in the second cell. The UL grant may be associated with a downlink (DL) signal. Whether to use the UL grant in the second cell may be determined based upon whether the DL signal is qualified.

Abstract: A method and device are disclosed from the perspective of a User Equipment (UE) with a first USIM (Universal Subscriber Identity Module) and a second USIM. In one method, the method includes the UE performing paging monitoring in a first serving cell associated with the first USIM. The method also includes the UE performing paging monitoring in a second serving cell associated with the second USIM. The method further includes the UE transmitting, to a network node associated with the second USIM, information related to at least one of the paging monitoring performed in the first serving cell or the paging monitoring performed in the second serving cell.

Abstract: Methods, systems, and apparatuses can comprise receiving a Sidelink (SL) grant, wherein the SL grant indicates a SL transmission, starting or restarting a first timer for a SL Hybrid Automatic Repeat Request (HARQ) process in a first symbol after the end of a Physical Uplink Control Channel (PUCCH) resource associated with the SL grant, or the SL transmission, when the first device does not transmit a SL HARQ feedback for the SL HARQ process on the PUCCH resource due to measurement gap or Listen-Before-Talk (LBT) failure, starting or restarting a second timer for the SL HARQ process in a first symbol, after the first timer expires, when the first device does not transmit the SL HARQ feedback for the SL HARQ process on the PUCCH resource due to measurement gap, or LBT failure, and the SL HARQ feedback is a negative acknowledgement, and monitoring a Physical Downlink Control Channel (PDCCH) when the second timer is running.

Abstract: Methods, systems, and apparatuses are provided for a UE in a wireless communication system comprising receiving a first signaling to configure at least one value of a Discontinuous Reception (DRX) parameter, receiving, in a serving cell, a second signaling indicating a first value of the DRX parameter or a second value of the at least one value of the DRX parameter, and performing at least one of the following: adjusting the DRX parameter for a first DRX group or a second DRX group of the UE based on a target DRX group indicated in the second signaling or based on whether the serving cell is assigned to the first DRX group or the second DRX group, restarting a drx-onDurationTimer, in response to receiving the second signaling, at a timing calculated based on the first value or the second value of the DRX parameter indicated in the second signaling, stopping the drx-onDurationTimer in response to receiving the second signaling and starting the drx-onDurationTimer at the timing, or stopping the drx-onDurationTi

Abstract: Methods, systems, and apparatuses are provided for a User Equipment (UE) in a wireless communication system receiving, from a network, a first signaling indicative of cell configuration of a cell, receiving, from the network, a second signaling indicative of switching a Special Cell (SpCell) of the UE to the cell or adding the cell as a serving cell, receiving, from the network, a third signaling indicative of a first time alignment information associated with the first Timing Advance Group (TAG), and in response to the second signaling: (1) switching the SpCell of the UE to the cell or adding the cell as the serving cell, (2) applying the first time alignment information on the first TAG, and (3) initiating a random access procedure on the cell when no time alignment information associated with the second TAG is in the third signaling.

Abstract: Methods, systems, and apparatuses can comprise receiving a Sidelink (SL) grant, wherein the SL grant indicates a SL transmission, starting or restarting a first timer for a SL Hybrid Automatic Repeat Request (HARQ) process in a first symbol after the end of a Physical Uplink Control Channel (PUCCH) resource associated with the SL grant, or the SL transmission, when the first device does not transmit a SL HARQ feedback for the SL HARQ process on the PUCCH resource due to measurement gap or Listen-Before-Talk (LBT) failure, starting or restarting a second timer for the SL HARQ process in a first symbol, after the first timer expires, when the first device does not transmit the SL HARQ feedback for the SL HARQ process on the PUCCH resource due to measurement gap, or LBT failure, and the SL HARQ feedback is a negative acknowledgement, and monitoring a Physical Downlink Control Channel (PDCCH) when the second timer is running.

Abstract: Methods, systems, and apparatuses are provided for mobile terminated small data transmission in a wireless communication system. A User Equipment (UE) can apply Downlink (DL) Semi Persistent Scheduling (SPS) in a Mobile Terminated Small Data Transmission (MT-SDT) procedure. The UE can handle the configured DL assignment for DL SPS. A method for a UE in a wireless communication system can comprise receiving one or more configurations of DL SPS for Radio Resource Control Inactive (RRC_INACTIVE) state, initiating a MT-SDT procedure in response to receiving a paging indicating MT-SDT, receiving, in RRC_INACTIVE state, one or more DL transmissions using a configured DL assignment for the DL SPS during the MT-SDT procedure, and keeping the one or more configurations of the DL SPS and entering RRC_CONNECTED state in response to receiving a RRC resume message during the MT-SDT procedure.

Abstract: A method for a User Equipment (UE) in a wireless communication system can comprise receiving, from a first cell, a first signaling indicative of a configuration of at least a second cell, receiving, from the first cell, a second signaling to switch a Special Cell (SpCell) of the UE to the second cell, wherein the second signaling comprises at least one of a Physical Downlink Control Channel (PDCCH) signaling or a Medium Access Control (MAC) Control Element (CE), performing a procedure to switch the SpCell of the UE in response to the second signaling, performing one or more actions in response to detecting a failure of the procedure, including: initiating a random access procedure on the second cell, transmitting a report to a network of the first cell, wherein the report indicates the unsuccessful switching of the SpCell to the second cell, or initiating a RRC connection re-establishment procedure.

Abstract: Methods, systems, and apparatuses are provided for enhancing timing alignment for uplink (UL) multi-Transmission/Reception Point (TRP) (or mTRP) scenarios in a wireless communication system. A method for a UE in a wireless communication system can comprise receiving a signaling, wherein the signaling indicates activation for a first TRP and/or is a Physical Downlink Control Channel (PDCCH) signal, determining to perform a first random access procedure on the first TRP, based on the signaling, to obtain a first Time Alignment (TA) information associated with the first TRP, and performing multi-TRP operation on the first TRP associated with the first TA information and a second TRP associated with a second TA information.

Abstract: A method and apparatus are disclosed. In an example from the perspective of a User Equipment (UE), the UE receives a first Radio Resource Control (RRC) message from a network node, wherein the first RRC message is indicative of a first uplink (UL) Bandwidth Part (BWP) of a cell. In response to initiation of a procedure to use a configured grant (CG) resource in RRC inactive state, the UE performs BWP switching from a second UL BWP of the cell to the first UL BWP of the cell. The UE performs, on the first UL BWP, a first UL transmission using the CG resource. In response to completion of the procedure, the UE performs BWP switching from the first UL BWP of the cell to the second UL BWP of the cell.

Abstract: A method and apparatus are disclosed, from the perspective of a UE, for transmitting UL RS. In one embodiment, the method includes deriving a first transmit power of a first UL RS based on a first power control mechanism, wherein derivation of the first transmit power based on the first power control mechanism is associated with an uplink data channel. In addition, the method includes deriving a second transmit power of a second UL RS based on a second power control mechanism, wherein derivation of the second transmit power based on the second power control mechanism is not associated with the uplink data channel. Furthermore, the method includes transmitting the first UL RS with the first transmit power. The method also includes transmitting the second UL RS with the second transmit power.

Abstract: A method and apparatus are disclosed. In an example from the perspective of a User Equipment (UE), the UE receives a first Radio Resource Control (RRC) message indicative of switching a Primary Cell (PCell) of the UE to a first cell, wherein the first RRC message is indicative of a first configuration of the first cell. The UE resets a Medium Access Control (MAC) entity associated with the PCell of the UE in response to receiving the first RRC message. The UE receives a second RRC message indicative of a second configuration of a second cell. The UE receives a signaling indicative of initiating a mobility procedure to switch the PCell of the UE to the second cell. The signaling includes a Physical Downlink Control Channel (PDCCH) signaling and/or a MAC Control Element (CE). The UE does not reset the MAC entity associated with the PCell of the UE in response to the mobility procedure.

Abstract: A method and apparatus are disclosed. In an example from the perspective of a User Equipment (UE), the UE maintains a first counter and a second counter, wherein the first counter and the second counter are associated with a Special Cell (SpCell) and are for counting beam failure instance indications. The UE initiates a first beam failure recovery (BFR) procedure based on the first counter being equal to or larger than a value, wherein the first BFR procedure includes initiating a random access procedure for SpCell BFR associated with the SpCell. The UE sets the first counter and the second counter to a defined value in response to completion of the first BFR procedure.

Abstract: A method and apparatus are disclosed. In an example from the perspective of a User Equipment (UE), the UE receives a first signaling configuring one or more sets of cells including a first set of cells. The first set of cells includes a first Special Cell (SpCell) and one or more Secondary Cells (SCells). The UE receives receiving a second signaling indicative of a change of Serving Cells of the UE to the first set of cells. In response to the second signaling, the UE adds and/or activates the first SpCell and the one or more SCells.

Abstract: A method and apparatus are disclosed. In an example from the perspective of a User Equipment (UE), the UE receives a first signaling indicating a configuration of a first cell, wherein the first cell is associated with a first timing advance group (TAG). The UE receives a second signaling indicative of addition of the first cell as a first Serving Cell. In response to the second signaling, the UE (i) adds the first cell as the first Serving Cell, and (ii) determines whether to initiate a random access procedure based on the second signaling, and/or based on whether the first cell is associated with a first valid timing advance value.