Abstract: A method and apparatus are disclosed, from the perspective of the UE, for performing random access procedure. In one embodiment, the method includes the UE receiving a message from a network. The message includes a TTI information of Msg3. In addition, the method includes the UE transmitting a preamble to the network. The method also includes the UE receiving a Msg2 from the network for responding the preamble. The method further includes the UE performing a Msg3 transmission to the network according to the TTI information of Msg3.

Abstract: A method and apparatus are disclosed from the perspective of a UE. In one embodiment, the method includes receiving a first signaling, wherein the first signaling includes an identity of a broadcast or multicast service. The method further includes receiving a second signaling, wherein the second signaling indicates an association between a numerology and an information of the broadcast or multicast service. The method also includes using the numerology to receive the broadcast or multicast service.

Abstract: A method and apparatus are disclosed from the perspective of a first device. In one embodiment, the method includes the first device receiving a configuration, from a network node, of a first sidelink resource pool without any Physical Sidelink Feedback Channel (PSFCH) resource. The method further includes the first device receiving a first sidelink grant transmitted, configured, or scheduled by the network node, wherein the first sidelink grant schedules or indicates at least a first sidelink resource in the first sidelink resource pool. Furthermore, the method includes the first device expecting or considering that the first sidelink grant provides no Physical Uplink Control Channel (PUCCH) resource for reporting Sidelink (SL) Hybrid Automatic Repeat Request (HARQ) feedback.

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 device are disclosed from the perspective of a second UE. The second UE initiates a first procedure of establishing the one-to-one connection with the first UE for a unicast communication between the first UE and the second UE or for a UE-to-UE communication between the first UE and a third UE via the second UE or a second procedure of establishing the one-to-one connection with the first UE for a UE-to-Network communication between the first UE and a network node via the second UE. The second UE transmits a first PC5-S message to the first UE for completing the first procedure of establishing the one-to-one connection with the first UE for the unicast communication or the UE-to-UE communication if the first procedure is initiated, wherein the first PC5-S message includes QoS information for the unicast communication or the UE-to-UE communication.

Abstract: A method and apparatus are disclosed from the perspective of a first UE (User Equipment) to perform sidelink logical channel (SL LCH) establishment. In one embodiment, the method includes the first UE storing a list of sidelink configurations, wherein each entry in the list contains one sidelink configuration and at least one PC5 QoS identifier (PQI) associated with the one sidelink configuration. The method further includes the first UE selecting an entry in the list according to a PQI of a PC5 QoS flow from a sidelink service. The method also includes the first UE establishing a SL LCH for the PC5 QoS flow according to a sidelink configuration of the entry and assigning an identity for the SL LCH.

Abstract: Methods and apparatuses for improving retransmission scheduling of sidelink communications are disclosed herein. In one method, a first device monitors a down control signal for scheduling sidelink resource. The first device performs a sidelink transmission for a second device based on a first sidelink grant allocated by a base station. The first device determines a retransmission need of the sidelink transmission based on a Hybrid Automatic Repeat Request (HARQ) feedback of the sidelink transmission from the second device. The first device transmits a retransmission indication for the retransmission need to the base station. The first device starts or restarts a timer upon the transmission of the retransmission indication, wherein the timer is used for controlling a period of monitoring a downlink control resource set.

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 from the perspective of a User Equipment (UE). In one embodiment, the method includes the UE receiving from a base station a first information indicating multiple sets of transmission occasions for a signal. The method also includes the UE receiving from the base station a second information indicating an association between a transmission occasion of the signal and a base station beam.

Abstract: A method and apparatus are disclosed from the perspective of a UE. In one embodiment, the method includes receiving a configuration, wherein the configuration indicates whether the UE performs a beam management during a specific period of time. The method also includes determining whether to perform the beam management during the specific period of time based on at least the configuration.

Abstract: A method and apparatus are disclosed from the perspective of a UE (User Equipment). In one embodiment, the method includes the UE receiving an SCell activation/deactivation MAC (Medium Access Control) control element to activate the SCell. The method further includes the UE activates the SCell based on the SCell activation/deactivation MAC control element. The method also includes the UE receiving a beam indication by a MAC control element via the PCell, wherein the beam indication includes a cell index and the beam indication is used to derive at least one beam to be used in the SCell. In addition, the method includes the UE using the at least one beam for a DL (Downlink) transmission or an UL (Uplink) transmission in the SCell.

Abstract: A method and apparatus are disclosed. In an example from the perspective of a User Equipment (UE), a random access procedure in a cell controlled by a network node is initiated. A downlink signal is selected from amongst configured downlink signals. A measured Reference Signal Received Power (RSRP) value associated with the downlink signal satisfies a first criterion associated with a first threshold. A measurement result associated with the downlink signal satisfies a second criterion associated with a second threshold. A random access preamble transmission of the random access procedure is performed on a Physical Random Access Channel (PRACH) occasion associated with the downlink signal.

Abstract: A method and apparatus are disclosed. In an example from the perspective of a User Equipment (UE), the UE initiates a random access procedure. The UE receives a Physical Downlink Control Channel (PDCCH) transmission. The UE determines whether contention resolution associated with the random access procedure is successful. If the initiating the random access procedure is performed for Special Cell (SpCell) beam failure recovery, the determining whether the contention resolution is successful is based on whether the PDCCH transmission is addressed to a Cell Radio Network Temporary Identifier (C-RNTI) of the UE. If the initiating the random access procedure is performed for Secondary Cell (SCell) beam failure recovery, the determining whether the contention resolution is successful is based on whether the PDCCH transmission is addressed to the C-RNTI of the UE and whether the PDCCH transmission contains an uplink (UL) grant for a new transmission.

Abstract: A method and apparatus are disclosed from the perspective of a device to perform sidelink communication. In one embodiment, the method includes the device receiving a sidelink grant from a network node, wherein the sidelink grant schedules or assigns multiple sidelink resources. The method further includes the device generating a data packet comprising or multiplexing sidelink data from Sidelink (SL) logical channel(s) with SL Hybrid Automatic Request (HARD) feedback enabled. The method further includes the device 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.

Abstract: A method and apparatus are disclosed. In an example from the perspective of a User Equipment (UE) with a first Universal Subscriber Identity Module (USIM) and a second USIM, the UE establishes a connection associated with the first USIM, wherein a UE state corresponding to the first USIM enters connected state. The UE stops monitoring paging in a serving cell for the second USIM based on a time domain pattern derived using a second UE Identifier (UE ID) associated with the second USIM, wherein the stopping monitoring paging is performed when the UE state corresponding to the first USIM is connected state and a UE state corresponding to the second USIM is idle state or inactive state. The UE receives, in a serving cell for the first USIM from a network node, an indication associated with activity for the second USIM via the connection associated with the first USIM.

Abstract: A method and apparatus are disclosed from the perspective of a UE (User Equipment). In one embodiment, the method includes triggering a beam recovery procedure. The method further includes using a first resource on a PUCCH (Physical Uplink Control Channel) channel to transmit a beam failure recovery request to a network. The method also includes receiving a response for the first beam failure recovery request, wherein the response is received within a first measurement gap.

Abstract: A method and apparatus are disclosed, from the perspective of the UE, for reporting channel state information (CSI). In one embodiment, the method includes a UE being configured with at least two CSI-RS (Channel State Information-Reference Signal) resources. In addition, the method includes the UE performing measurements on the at least two CSI-RS resources. The method also includes the UE generating multiple CSIs according to measurements on the at least two CSI-RS resources, wherein at least one CSI corresponds to measurements on more than one CSI-RS resource. The method further includes the UE reporting at least one of the generated CSIs.

Abstract: A method for a wireless communications system is disclosed. In one example, user equipment (UE) (e.g. a mobile phone) receives an indication from a network (for example, by way of a transmission and reception point (TRP)) indicating whether a first transmission and a second transmission to the UE can be combined for decoding. The UE also receives the first transmission via a first UE beam and the second transmission via a second UE beam. The first transmission and the second transmission are received concurrently. The first and second transmissions can arrive via different serving beams and/or different TRPs of the same cell. Based on the indication, the UE combines the first and second transmissions for decoding purposes.

Abstract: A method and apparatus are disclosed. In an example from the perspective of a User Equipment (UE) configured with uplink (UL) spatial multiplexing and UL skipping, the UE receives, from a base station, two UL grants for a Transmission Time Interval (TTI). The UE generates two Medium Access Control (MAC) Protocol Data Units (PDUs) for the TTI, wherein a first MAC PDU of the two MAC PDUs is able to accommodate all available data of the UE. The UE transmits the two MAC PDUs to the base station.

Abstract: A method and apparatus are disclosed from the perspective of a communication device. In one embodiment, the method includes the device being configured with a plurality of resource pools by a base station for a cell. The method further includes the device receiving a grant from the base station, wherein the grant indicates a resource associated with a resource pool of the plurality of resource pools through a resource pool index in the grant. The method also includes the device using the resource to perform a transmission on a device-to-device interface.