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: A method and device are disclosed from the perspective of a User Equipment-to-User Equipment (UE-to-UE) Relay to perform a link identifier update procedure. In one embodiment, the method includes the UE-to-UE Relay receiving a first PC5-S message from a first UE to modify at least one first link identifier, wherein the first PC5-S message includes a Layer-2 Identity (ID) of the first UE. The method also includes the UE-to-UE Relay transmitting a second PC5-S message to a second UE, in response to reception of the first PC5-S message, to modify at least one second link identifier, wherein the second PC5-S message includes a Layer-2 ID of the UE-to-UE Relay and does not include the Layer-2 ID of the first UE.

Abstract: A method and device are disclosed from the perspective of a relay UE for Radio Resource Control (RRC) connection establishment to support User Equipment (UE)-to-Network relaying. In one embodiment, the method includes a relay UE establishing a PC5 RRC connection or a PC5 unicast link with a remote UE. The method also includes the relay UE receiving a RRC message from the remote UE. Furthermore, the method includes the relay UE initiating a RRC connection establishment with a network node in response to reception of the RRC message. In addition, the method includes the relay UE transmitting a Disconnect Request message to the remote UE to release the PC5 RRC connection or the PC5 unicast link or transmits a PC5 RRC message to the remote UE to inform the remote UE of a failure of the RRC connection establishment, if the RRC connection establishment fails.

Abstract: A method and apparatus are disclosed from the perspective of a UE (User Equipment). In one embodiment, the method includes the UE receiving a first signaling containing mapping between resource allocation mode(s) and attribute(s) of sidelink data of the UE from a base station. The method further includes the UE performing a sidelink transmission of the sidelink data based on the mapping between the resource allocation mode(s) and the attribute(s) of the sidelink data.

Abstract: Control structures and techniques for transmission time interval (TTI) shortening in wireless communication systems are provided. Exemplary techniques can comprise establishing a UE device connection to a base station having a first TTI, wherein the UE device is configured to employ TTI shortening and has a second TTI different from the first TTI and monitoring a first short physical downlink control channel (PDCCH) region for a scheduled downlink (DL) transmission via the second TTI, wherein a time distribution associated with multiple second TTIs within the first TTI is determined based on a control format indicator (CFI) value indicated via the first TTI.

Abstract: A method and apparatus are disclosed. In an example from the perspective of a first User Equipment (UE), the first UE generates a message requesting inter-UE coordination information, wherein the message includes information associated with a first priority value. The first UE generates a Medium Access Control (MAC) Protocol Data Unit (PDU) including the message. The first UE sets a value of a priority field in a first sidelink control information (SCI) based on a second priority value of the message, wherein the second priority value of the message is a configured value and/or a lowest priority value among a defined set of priority values. The first UE transmits the first SCI to one or more UEs including a second UE, wherein the first SCI schedules a first Physical Sidelink Shared Channel (PSSCH) transmission for transmitting the MAC PDU.

Abstract: A method and apparatus are disclosed from the perspective of a network node. In one embodiment, the method includes the network node configuring a UE (User Equipment) with a first DRB (Data Radio Bearer), wherein the first DRB is configured with a presence of SDAP (Service Data Adaptation Control) header and the network node is not allowed to reconfigure the first DRB with an absence of SDAP header before the first DRB is released. The method further includes the network node configuring the UE to serve a first QoS (Quality of Service) flow and a second QoS flow by the first DRB. The method also includes re-configuring the UE to serve the first QoS flow by a second DRB, which was originally served by the first DRB, if the second QoS flow is released or removed from the first DRB, wherein the second DRB is configured with an absence of SDAP header.

Abstract: A method and apparatus are disclosed. In an example from the perspective of a base station operating with Semi-Persistent Scheduling (SPS) for unicast and multicast, the base station configures a User Equipment (UE) with a unicast SPS operation configuration using a first information element including a sps-Config information element or a sps-ConfigToAddModList information element. The base station determines, based upon whether the first information element includes the sps-Config information element or the sps-ConfigToAddModList information element, whether or not to configure the UE with a multicast SPS operation configuration using a sps-ConfigMulticastToAddModList information element.

Abstract: A method and apparatus are disclosed. In an example, a first node may trigger a scheduling request (SR) based upon an expected transmission from a second node which is a child node of the first node. The first node may determine a first SR configuration for the SR from a plurality of SR configurations configured to the first node.

Abstract: A method and apparatus are disclosed from the perspective of a transmitting device. In one embodiment, the method includes being configured or allocated with an identity, wherein the identity comprises a first part of the identity and a second part of the identity. The method also includes the transmitting device generating a data packet for sidelink transmission, wherein the data packet includes the second part of the identity. Furthermore, the method includes transmitting device generating a control information associated with the data packet, wherein the control information includes the first part of the identity. The method further includes the transmitting device transmits the control information and the data packet.

Abstract: A method and apparatus are disclosed. In an example from the perspective of a User Equipment (UE), the UE receives an indication from a base station, wherein the indication is indicative of monitoring a power saving signal in one or more monitoring occasions and at least one monitoring occasion of the one or more monitoring occasions is associated with a Discontinuous Reception (DRX) ON duration and is within Active Time associated with the UE. The UE does not monitor and/or skips monitoring the power saving signal in the at least one monitoring occasion. The UE monitors Physical Downlink Control Channel (PDCCH) during the DRX ON duration.

Abstract: A method and device are disclosed from the perspective of a first User Equipment (UE) to support Sidelink (SL) Discontinuous Reception (DRX). In one embodiment, the method includes the first UE establishing a unicast link with a second UE. The method further includes the first UE receiving a SL DRX configuration associated with the second UE from the second UE. The method also includes the first UE transmitting the SL DRX configuration to a network node. In addition, the method includes the first UE receiving a sidelink grant from the network node, wherein the sidelink grant indicates sidelink resources. Furthermore, the method includes the first UE performing a sidelink transmission to the second UE based on the sidelink resources.

Abstract: A method and apparatus are disclosed from the perspective of a first device for performing sidelink transmission in a sidelink resource pool. In one embodiment, the first device has a configuration of the sidelink resource pool, wherein the sidelink resource pool is enabled with resource reservation for different Transport Blocks (TBs). The first device also has a configuration of a list of reserved periods. Furthermore, the first device selects or determines a first reserved period from the list of reserved periods, wherein the first selected or determined reserved period is within a first set of reserved periods. In addition, the first device randomly selects a first integer in a first interval, wherein the first interval is based on a scaling factor and a second interval, and the scaling factor is derived based on a largest reserved period in the first set of reserved periods, and wherein the first integer indicates a number of transmission opportunities of different TBs with the first reserved period.

Abstract: A method and apparatus such as a device to perform sidelink communication including receiving a sidelink grant from a network node, wherein the sidelink grant schedules or assigns multiple sidelink resources, generating a data packet comprising or multiplexing sidelink data from Sidelink (SL) logical channel(s) with SL Hybrid Automatic Request (HARQ) feedback enabled, performing two sidelink transmissions for the data packet on two adjacent, neighbor, or consecutive sidelink resources among the multiple sidelink resources if a time gap of the two adjacent, neighbor, or consecutive sidelink resources is larger than or equal to a minimum time gap, and the device being allowed to drop, skip, or cancel a sidelink transmission on one sidelink resource of the two adjacent, neighbor, or consecutive sidelink resources among the multiple sidelink resources if the time gap of the two adjacent, neighbor, or consecutive sidelink resources is less than a minimum time gap.

Abstract: In an example, a User Equipment (UE) operates with shared spectrum channel access on a carrier and/or a cell. The UE receives a configuration for configuring configured grants for uplink transmission in a bandwidth part (BWP). The configured grants include a first configured grant and a second configured grant. The UE configures a first minimum Downlink Feedback Indication (DFI) time delay for the first configured grant according to the configuration. The first minimum DFI time delay is for validation of Hybrid Automatic Repeat Request (HARQ) information in response to one or more first uplink transmissions. The UE configures a second minimum DFI time delay for the second configured grant according to the configuration. The second minimum DFI time delay is for validation of HARQ information in response to one or more second uplink transmissions. The UE does not expect the second minimum DFI time delay to have a different value than the first minimum DFI time delay.

Abstract: In an example, a UE receives, from a network, a configuration of a sidelink resource pool. Physical Sidelink Feedback Channel (PSFCH) resources of the sidelink resource pool are configured, periodically with a period of N slots, in slots of the sidelink resource pool. The UE receives, from the network, a configuration with a set of time offsets for determining an association set. The UE determines one or more slots. Each slot of the one or more slots is in the association set and contains a PSFCH resource of the sidelink resource pool. The UE generates a sidelink Hybrid Automatic Repeat Request acknowledgement (HARQ-ACK) codebook based upon one or more occasions associated with one or more PSFCH resources of the sidelink resource pool. The one or more occasions is determined or derived based upon the one or more slots and the period of N slots.

Abstract: A method and device are disclosed from the perspective of a User Equipment-to-User Equipment (UE-to-UE) Relay to perform a PC5 unicast link establishment procedure. In one embodiment, the method includes the UE-to-UE Relay receiving a first PC5-S message from a first User Equipment (UE), wherein the first PC5-S message includes a Layer-2 Identity (ID) of a second UE. The method further includes the UE-to-UE Relay transmitting a second PC5-S message addressed to the Layer-2 ID of the second UE for establishing a PC5 unicast link with the second UE. The method also includes the UE-to-UE Relay receiving a third PC5-S message from the second UE, wherein the third PC5-S message is transmitted by the second UE in response to reception of the second PC5-S message.

Abstract: A method and apparatus are disclosed from the perspective of a first UE (User Equipment) to report UE sidelink capability information to a network node. In one embodiment, the method includes the first UE establishing a unicast link with a second UE. The method also includes the first UE receiving a second sidelink capability information of the second UE from the second UE. The method further includes the first UE transmitting a first sidelink capability information of the first UE and the second sidelink capability information to the network node or transmitting a common sidelink capability information to the network node, wherein the common sidelink capability information is derived from the first sidelink capability information and the second sidelink capability 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: Methods, systems, and apparatuses are provided for User Equipment (UE) location reporting in a wireless communication system to facilitate efficiency in measurement reporting in Non-Terrestrial Networks (NTNs). A method for a UE in a wireless communication system comprises receiving a first configuration to trigger measurement reporting based on a first event that distance between the UE and a first reference location of a serving cell becomes larger than a distance threshold and distance between the UE and a second reference location of a first neighbor cell becomes shorter than another distance threshold, and triggering a first measurement report based on the first event, wherein measured radio condition of the first neighbor cell is omitted or not included in the first measurement report.