Abstract: A method and device are disclosed from the perspective of a User Equipment-to-User Equipment (UE-to-UE) Relay. In one embodiment, the method includes the UE-to-UE Relay establishing a first PC5 unicast link with a first UE and establishes a second PC5 unicast link with a second UE. The method further includes the UE-to-UE Relay initiating a Layer-2 link release procedure to release the second PC5 unicast link if a sidelink radio link failure is detected on the first PC5 unicast link.

Abstract: A method and apparatus are disclosed for a device to perform sidelink communication. The device triggers or requests to perform partial sensing-based resource selection in a first Transmission Time Interval (TTI) in a sidelink resource pool. The device also derives or determines a set of candidate TTIs within a resource selection window in response to the trigger or request, wherein sidelink resources in the set of candidate TTIs are candidate sidelink resources. Furthermore, when the device does not perform sensing in a second TTI, the device excludes a number of candidate sidelink resources, from the candidate sidelink resources, associated with the second TTI, wherein the second TTI is after the first TTI and before the first candidate TTI of the set of candidate TTIs. The device further derives or determines a set of sidelink resources, from the candidate sidelink resources at least excluding the number of candidate sidelink resources.

Abstract: Methods, systems, and apparatuses are provided for deriving cell reference location in a wireless communication system. A method for a UE in the wireless communication system can comprise receiving information of a first reference location of a cell, receiving an assistance information associated with the cell, deriving and/or acquiring a second reference location of the cell based on at least the assistance information, and using the second reference location of the cell to evaluate a location-based event or measurement.

Abstract: A method and apparatus are disclosed from the perspective of a network in a wireless communication system. In one embodiment, the method includes the network configuring a User Equipment (UE) with cross-carrier scheduling, wherein the network transmits Physical Downlink Control Channel (PDCCH) on a first cell scheduling a second cell. The method further includes the network configuring the UE with PDCCH repetition on two search spaces of the first cell. In addition, the method includes the network being allowed to configure the UE with PDCCH repetition on two search spaces of the second cell only if two search spaces of the first cell, having same search space identities as the two search spaces of the second cell, have been configured with PDCCH repetition.

Abstract: In supporting multiple connectivity services, a remote UE establishes a PC5 unicast link with a Layer-2 UE-to-Network relay UE. Furthermore, the remote UE establishes at least two connectivity services with at least two data networks over the PC5 unicast link.

Abstract: Methods and apparatuses are provided for power headroom report regarding multiple TRPs in a wireless communication system. The systems and methods of the present invention address, expand, and improve how networks perform power control on multiple TRPs, how networks manage power control for uplink transmissions for different links, and how a UE derives one or more PH/PHR for different links.

Abstract: A method and device are disclosed from the perspective of a first User Equipment (UE). In one embodiment, the UE receives a configuration of a threshold. Furthermore, the UE determines whether to initiate a procedure of small data transmission based on at least the threshold. In addition, the UE does not initiate the procedure of small data transmission if a radio condition of the UE is below the threshold.

Abstract: A method and device are disclosed for Uu radio bearer to Sidelink (SL) Radio Link Control (RLC) mapping. In one embodiment, the method includes a network node transmitting a Radio Resource Control (RRC) message to a relay User Equipment (UE), wherein the RRC message includes a first information indicating a mapping which represents an association between a Uu radio bearer and a SL RLC bearer and wherein the RRC message also includes a second information identifying a remote UE associated with the mapping. The method further includes the network node transmitting an adaptation layer Protocol Data Unit (PDU) to the relay UE, wherein a header of the adaptation layer PDU includes an identity of the Uu radio bearer and a local UE identifier of the remote UE.

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 an uplink (UL) grant. The UL grant is indicative of a first Physical Uplink Shared Channel (PUSCH) transmission on a first Transmission/Reception Point (TRP) of a first cell. The UL grant is not indicative of a PUSCH transmission on a second TRP of the first cell. The UE transmits a Power Headroom Reporting (PHR) Medium Access Control (MAC) Control Element (CE). Based on the UL grant, the PHR MAC CE is indicative of a first power headroom (PH), associated with the first TRP, based on a real PUSCH transmission, and is indicative of a second PH, associated with the second TRP, based on a reference PUSCH transmission.

Abstract: A method and device are disclosed for a remote User Equipment (UE) to support UE-to-Network relay communication. In one embodiment, the method includes the remote UE connecting with a relay UE. The method also includes the remote UE connecting with a first network node via the relay UE. The method further includes the remote UE receiving a first Radio Resource Control (RRC) message from the first network node via the relay UE, wherein the first RRC message includes a Cell Radio Network Temporary Identifier (C-RNTI) of the remote UE used for constructing authentication information.

Abstract: A method and device are disclosed from the perspective of a User Equipment (UE). In one embodiment, the UE initiates a Small Data Transmission (SDT) procedure in RRC_INACTIVE state. Furthermore, the UE transmits a Radio Resource Control (RRC) message to network in response to arrival of a first data, to be transmitted to the network, during the SDT procedure, wherein the first data is not allowed to be transmitted via the SDT procedure.

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

Abstract: In an example, a User Equipment (UE) receives a message associated with Physical Downlink Shared Channel (PDSCH) parameter configuration. The message includes a first parameter indicating a first list of entries associated with time resource allocation for multiple PDSCHs, a second parameter indicating reception of multiple repetitions for a single PDSCH, and a third parameter indicating a second list of entries associated with time resource allocation. Each entry in the second list indicates a single time resource allocation. If the UE receives a Downlink Control Information (DCI) indicative of a first entry in the first list, the UE receives a plurality of PDSCHs based on a plurality of time resource allocations indicated by the first entry. A first repetition number for the plurality of PDSCHs is determined to be one.

Abstract: Methods and apparatuses are provided for power headroom report regarding multiple TRPs in a wireless communication system. The systems and methods of the present invention address, expand, and improve how networks perform power control on multiple TRPs, how networks manage power control for uplink transmissions for different links, and how a UE derives one or more PH/PHR for different links.

Abstract: A method and apparatus are disclosed. In an example from the perspective of a first device, the first device performs sidelink communication with a first set of destinations, wherein one or more devices, associated with a destination of the first set of destinations, discontinuously monitor one or more sidelink control channels and/or one or more sidelink control informations (SCIs). The first device receives a sidelink grant from a network, wherein the sidelink grant is for performing a sidelink transmission at a first timing. The first device selects, from among a second set of destinations, a first destination for the sidelink transmission, wherein each destination of the second set of destinations is determined to have an active time for sidelink containing the first timing.

Abstract: A method and apparatus are disclosed from the perspective of a network. In one embodiment, the method includes the network transmitting a Semi-Persistent Scheduling (SPS) configuration to a User Equipment (UE) for configuring a second Physical Downlink Shared Channel (PDSCH). The method also includes the network transmitting a configuration to the UE for configuring a first monitoring occasion for a first Physical Downlink Control Channel (PDCCH) and a second monitoring occasion for a second PDCCH, wherein the second PDCCH is associated with the first PDCCH. The method further includes the network not allowing the first PDCCH and the second PDCCH to schedule the UE with a first PDSCH partially or fully overlapping with the second PDSCH in time domain, wherein a last symbol of a later monitoring occasion among the first and the second monitoring occasion ends less than a processing threshold before a starting symbol of the second PDSCH.

Abstract: Methods and apparatuses for handling discontinuous reception and partial sensing for sidelink communication to reduce potential latency due to additional sensing, and to improve resource utilization efficiency. A first device can perform sidelink communication to at least a second device, or a second device in a sidelink resource pool, and trigger to perform resource selection for a sidelink data at a timing. The first device can perform sensing for a first contiguous sensing duration before a sidelink on-duration active time of the second device, determine or select a first sidelink resource from a set of sidelink resources, derive or determine the set of sidelink resources based on at least a sensing result in the first contiguous sensing duration, and perform a first sidelink transmission on the first sidelink resource for transmitting the sidelink data to the second device.

Abstract: A method and device are disclosed from the perspective of a Remote User Equipment (UE) for modifying QoS information. In one embodiment, the method includes a Remote User Equipment (UE) transmitting a first message to a Relay UE for QoS information modification, wherein the first message includes at least one QoS rule and/or at least one QoS flow description associated with a Protocol Data Unit (PDU) session.

Abstract: A method and device are disclosed for a relay User Equipment (UE). The relay UE connects with a remote UE or serving the remote UE for a relay communication with a network node. The relay UE receives a message on a PC5 RLC channel from the remote UE, wherein the PC5 RLC channel is associated with a Uu SRB1 for the remote UE or a Uu SRB on which the remote UE transmitting RRC signalling in RRC_CONNECTED. The relay UE initiates or performs a RRC connection resume procedure with the network node in response to reception of the message on the PC5 RLC channel or when data is available for transmission from the relay UE to the network node on a Uu RLC channel associated with the Uu SRB1 for the remote UE or the Uu SRB on which the remote UE transmitting RRC signalling in RRC_CONNECTED.