Abstract: A method and device for a UE-to-Network (U2N) Relay User Equipment (UE) are disclosed. In one embodiment, the U2N Relay UE establishes at least one PC5 connection (or PC5 unicast link) with at least one child UE and establishes a Radio Resource Control (RRC) connection with a network node. Furthermore, the U2N Relay UE receives a Sidelink Relay Adaptation Protocol (SRAP) Data Protocol Data Unit (PDU) on a Uu Relay Radio Link Control (RLC) Channel from the network node, wherein the SRAP Data PDU includes a header and a data field and wherein the header includes a BEARER identity (ID) field and a UE ID field.

Abstract: Methods, systems, and apparatuses are provided for configuration of User Equipment (UE)-initiated beam reporting in a wireless communication system, wherein a method for a UE comprises being configured with a plurality of report configurations comprising a first report configuration associated with an event and a second report configuration not associated with any event, and being configured with one or more trigger states associated with one or more report configurations, wherein the UE does not expect that any trigger state of the one or more trigger states is associated with the first report configuration associated with the event and the second report configuration not associated with any event.

Abstract: A method and device for channel state information reference resource. In one embodiment, a User Equipment (UE) is configured to report Channel State Information (CSI) to a base station. Furthermore, the UE measures reference signal on a symbol in a slot for reporting the CSI. In addition, the slot is determined based on transmission direction of frequency resource to be measured for the CSI.

Abstract: A method and device for an Intermediate UE-to-Network (U2N) Relay User Equipment (UE) are disclosed. In one embodiment, the Intermediate U2N Relay UE establishes a first PC5 connection with a Remote UE and establishes a second PC5 connection with a last U2N Relay UE. The Intermediate U2N Relay UE also receives paging information from the Remote UE. Furthermore, the Intermediate U2N Relay UE transmits the paging information received from the Remote UE to the last U2N Relay UE. In addition, the Intermediate U2N Relay UE detects a radio link failure to the first PC5 connection with the Remote UE. Also, the Intermediate U2N Relay UE transmits information indicating a paging information release associated with the Remote UE to the last U2N Relay UE in response to detecting the radio link failure.

Abstract: A method and apparatus are disclosed. In an example, a User Equipment (UE) triggers a first Power Headroom Report (PHR). The UE receives one or more uplink grants indicative of a first Physical Uplink Shared Channel (PUSCH) and a second PUSCH on a second serving cell, wherein the first PUSCH at least partially overlaps with the second PUSCH in time domain. The UE selects the first PUSCH, from among the first PUSCH and the second PUSCH, based on one or more first characteristics of the first PUSCH and/or one or more second characteristics of the second PUSCH. The UE determines the first PHR for the second serving cell based on the first PUSCH. The UE transmits a PHR Medium Access Control (MAC) Control Element (CE), include the first PHR, to a network node that configured the UE to report one PHR for one serving cell.

Abstract: A method and device for a first User Equipment (UE) are disclosed. In one embodiment, the first UE establishes a PC5 connection with a second UE for supporting a UE-to-UE (U2U) relay communication. The first UE also sends to the second UE a message to trigger a negotiated relay reselection, wherein the message includes a relay reselection indication information element (IE) and a link modification operation code IE set to a specific value.

Abstract: Methods, systems, and apparatuses are provided for relay User Equipment (UE) supporting candidate UE-to-UE (U2U) relay discovery, wherein a method for a relay UE comprises receiving, from a target end UE, a discovery solicitation message for candidate U2U relay discovery, and determining to transmit a discovery response message to the target end UE, in response to reception of the discovery solicitation message for candidate U2U relay discovery, wherein the discovery response message indicates the discovery response message being used for candidate U2U relay discovery by at least setting an application layer Identification (ID) indicated in the discovery response message to a specific value.

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: A method and apparatus are disclosed. In an example from the perspective of a first User Equipment (UE), the first UE determines a first priority value associated with a first Sidelink (SL) transmission to a second UE. The first UE determines a second priority value associated with a Scheduling Request (SR) transmission to a network node based upon one or more priority values associated with one or more second SL transmissions associated with a SL resource request based upon which the SR transmission is triggered. The first UE selects, from among a plurality of transmissions including the first SL transmission and the SR transmission, one of the first SL transmission or the SR transmission based upon the first priority value and the second priority value. The first UE performs the selected transmission.

Abstract: A method and device for a relay User Equipment (UE) are disclosed. In one embodiment, the relay UE establishes a first UE-to-UE (U2U) relay communication between a source end UE and a first target end UE and a second U2U relay communication between the source end UE and a second target end UE. The relay UE also sends a PC5 Radio Resource Control (RRC) message to the source end UE, wherein the PC5 RRC message includes a list information indicating at least one of a first mapping of a first local UE Identity (ID) and a first layer-2 ID for the first target end UE and a second mapping of a second local UE ID and a second layer-2 ID for the second target end UE.

Abstract: A method and device for a relay User Equipment (UE) are disclosed. In one embodiment, the relay UE establishes a first direct link with a source end UE and a second direct link with a target end UE for supporting UE-to-UE (U2U) relay communication between the source end UE and the target end UE via the relay UE. The relay UE also receives a first link identifier update request message from the source end UE for updating a first user info of the source end UE to a second user info of the source end UE. Furthermore, the relay UE, in response to reception of the first link identifier update request message, performs a first relay update procedure with the target end UE.

Abstract: Methods, systems, and apparatuses are provided for transport block generation with retransmission of Multi-Input Multi-Output (MIMO) in a wireless communication system, wherein a method comprises receiving, from a network node, a first parameter indicating MIMO layers with a value above four and a second parameter indicating Uplink (UL) skipping, receiving a first UL grant and a second UL grant on a first Physical Downlink Control Channel (PDCCH), wherein the first UL grant is for a retransmission of a first Medium Access Control (MAC) Protocol Data Unit (PDU) and the second UL grant is for a first new transmission, generating a second MAC PDU corresponding to the second UL grant indicated by the first PDCCH if the first MAC PDU is to be retransmitted for the first PDCCH, wherein there is no data available for transmission or for any Logical Channel Group (LCG), and performing the retransmission for the first MAC PDU using the first UL grant, and the first new transmission for the second MAC PDU using the sec

Abstract: An Intermediate UE-to-Network (U2N) Relay UE is disclosed. The Intermediate U2N Relay UE establishes a first PC5 connection with a Remote UE and establishes a second PC5 connection with a Layer-2 (L2) U2N Relay UE. The Intermediate U2N Relay UE receives a Radio Resource Control (RRC) Setup Request message on SRB0 from the Remote UE, wherein the RRC Setup Request message is included in a first PC5 Sidelink Relay Adaptation Protocol (SRAP) Protocol Data Unit (PDU) without header. The Intermediate U2N Relay UE transmits the RRC Setup Request message on SRB0 to the L2 U2N Relay UE, wherein the RRC Setup Request message is included in a second PC5 SRAP PDU with a first header and the first header includes a UE identity (ID) of the Remote UE and wherein the UE ID of the Remote UE is included in a RRC Reconfiguration message received from a network node.

Abstract: Methods, systems, and apparatuses are provided for target end User Equipment (UE) supporting candidate UE-to-UE (U2U) relay discovery in a wireless communication system, wherein a method for a target end UE comprises establishing a connection with a relay UE for supporting U2U relay communication between a source end UE and the target end UE via the relay UE, receiving a link modification request message indicating a list of candidate relay UEs from the relay UE for performing negotiated relay reselection, determining to transmit a discovery solicitation message to a candidate relay UE among the list of candidate relay UEs, wherein the discovery solicitation message indicates the discovery solicitation message being used for candidate U2U relay discovery by at least setting an application layer Identification (ID) indicated in the discovery solicitation message to a specific value, receiving, from the candidate relay UE, a discovery response message for candidate U2U relay discovery, and transmitting a link m

Abstract: Methods, systems, and apparatuses are provided for handling User Equipment (UE)-initiated beam reporting in a wireless communication system, wherein a method of a UE comprises being configured with a first UE-initiated beam reporting associated with a Serving Cell, wherein the first UE-initiated beam reporting is (initiated or triggered) based on comparison between a quality of a current beam of the Serving Cell and a quality of a candidate beam of the Serving Cell, maintaining a counter associated with the first UE-initiated beam reporting of the Serving Cell, and resetting the counter in response to a beam change of the current beam on the Serving Cell.

Abstract: Methods, systems, and apparatuses are provided for transmitting User Equipment (UE) triggered reports in a wireless communication system, wherein a method of a UE comprises receiving a plurality of Channel State Information (CSI) report configurations associated with a UE-initiated report, generating a first UE-initiated report if a condition of a first event is satisfied, transmitting a Pre-Notification (PN) on a first Uplink (UL) resource, and transmitting the first UE-initiated report on a second UL resource.

Abstract: A method and device for a relay User Equipment (UE). In one embodiment, the relay UE receives a first PC5 message from a first remote UE for initiating a first direct link establishment procedure for a UE-to-UE (U2U) relay communication with a second remote UE. Furthermore, the relay UE, in response to reception of the first PC5 message, sends a second PC5 message for initiating a second direct link establishment procedure for the U2U relay communication with the first remote UE. In addition, the relay UE sends a reject message corresponding to the first PC5 message to the first remote UE if the second direct link establishment procedure is not completed within a period.

Abstract: Methods, systems, and apparatuses are provided for sidelink transmission in unlicensed spectrum in a wireless communication system, wherein a method comprises receiving a configuration for configuring a first sidelink resource pool, triggering or requesting sensing-based resource selection or re-selection for performing one or more sidelink transmissions in the first sidelink resource pool, wherein one parameter is provided or determined or used to indicate a second number of consecutive Transmission Time Intervals (TTIs) being larger than one, determining a set of candidate resources, comprising: determining a first number of candidate resources in a resource selection window, wherein the first number of candidate resources comprises only candidate resources where each candidate resource starts in a TTI associated with the first sidelink resource pool and has the second number of consecutive TTIs in the first sidelink resource pool, and the second number of consecutive TTIs are consecutive in physical TTIs.

Abstract: A method and apparatus are disclosed. In an example from the perspective of a User Equipment (UE), the UE receives an indication of activation of Cell Discontinuous Transmission (DTX), wherein the Cell DTX is associated with one or more active periods and one or more non-active periods, and the UE is configured with a plurality of Channel State Information Reference Signal (CSI-RS) resources for deriving a CSI report. The UE determines whether to transmit the CSI report based on whether the UE receives a CSI-RS in an active period of the one or more active periods associated with the Cell DTX.

Abstract: Methods, systems, and apparatuses are provided for transmission of sidelink reference signals and sidelink data in a wireless communication system, wherein a method of a first device comprises receiving a first configuration of a first sidelink resource pool shared for sidelink data transmission and sidelink reference signal, receiving a second configuration of a first parameter of a maximum number of sidelink data transmissions in the first sidelink resource pool, selecting a first number for sidelink data retransmissions and also for sidelink reference signal transmissions based on the first parameter, selecting one or more first sidelink resources, in the first sidelink resource pool, according to at least the first number, and performing at least a first sidelink data retransmission for a sidelink data packet and a first sidelink reference signal transmission on a first sidelink resource of the one or more first sidelink resources.