Abstract: Various examples and schemes pertaining to resource configuration for MsgA in a two-step random access channel (RACH) procedure in mobile communications are described. An apparatus determines a time-frequency resource for transmission of a first message in a RACH procedure with a wireless network by using a one-to-one mapping between a RACH preamble sequence number and a first message resource index with the first message resource index indicating the time-frequency resource. The apparatus then transmits the first message in the time-frequency resource to the wireless network.

Abstract: Various solutions for transmission without dynamic scheduling with respect to user equipment and network apparatus in mobile communications are described. An apparatus may receive a configured grant. The apparatus may select an allowed logical channel to use the configured grant. The apparatus may schedule uplink data from the allowed logical channel to a protocol data unit (PDU). The apparatus may transmit the PDU on the configured grant.

Abstract: Various solutions for handling data duplication with respect to user equipment and network apparatus in mobile communications are described. An apparatus may establish a first link and a second link with a network. The apparatus may generate a first protocol data unit (PDU) to transmit on the first link. The apparatus may generate a second PDU to transmit on the second link. The apparatus may transmit the first PDU on the first link. The apparatus may determine whether to discard the second PDU according to a condition. The second PDU may be duplicated from the first PDU.

Abstract: Various solutions for detecting consistent listen before talk (LBT) failure with respect to user equipment and network apparatus in mobile communications are described. An apparatus may determine whether an LBT failure is detected. The apparatus may start a first timer in an event that the LBT failure is detected. The apparatus may increase an LBT counter. The apparatus may determine whether the LBT counter reaches a threshold value. The apparatus may determine a consistent LBT failure event in an event that the LBT counter reaches the threshold value.

Abstract: Various solutions for skipping uplink transmission with respect to user equipment and network apparatus in mobile communications are described. An apparatus may determine whether a padding buffer status report (BSR) is included in a protocol data unit (PDU). The apparatus may skip transmission of the PDU when the padding BSR is included in the PDU. The PDU may comprise a medium access control (MAC) PDU. The MAC PDU may comprise no MAC service data unit (SDU).

Abstract: Various examples and schemes pertaining to overhead reduction in transmission of small Ethernet packets are described. When an apparatus receives a first packet over a wired link, with the first packet comprising a plurality of data bits and one or more first padding bytes, the apparatus removes the one or more first padding bytes from the first packet to provide an unpadded packet. The apparatus then transmits the unpadded packet over a wireless link. When the apparatus receives a second packet over the wireless link, the apparatus inserts one or more second padding bytes into the second packet to provide a padded packet having a length equal to a predefined minimum desired packet length. The apparatus also transmits the padded packet over the wired link.

Abstract: Various solutions for handling overlapped transmission opportunities with respect to user equipment and network apparatus in mobile communications are described. An apparatus may receive configurations allocating a first transmission opportunity and a second opportunity. The apparatus may determine whether the first transmission opportunity and the second transmission opportunity are overlapped. The apparatus may determine a priority of at least one of the first transmission opportunity and the second transmission opportunity according to a predetermined rule in an event that the first transmission opportunity and the second transmission opportunity are overlapped. The apparatus may perform a transmission according to the priority.

Abstract: Various examples and schemes pertaining to channel access priority class (CAPC) for uplink (UL) transmissions in New Radio (NR) unlicensed spectrum (NR-U) are described. An apparatus implemented in a user equipment (UE) receives, from a network node of a wireless network, a radio resource control (RRC) configuration indicating a first channel access priority class (CAPC) for one or more logical channels. The apparatus determines a second CAPC to be used for a listen-before-talk (LBT) procedure. The apparatus then performs the LBT procedure using the second CAPC to detect whether a channel is clear for transmission.

Abstract: Various examples and schemes pertaining to multiplexing, addressing and HARQ for MsgB in two-step RACH in mobile communications are described. An apparatus implemented in a user equipment (UE) transmits to a network node of a wireless network a first message containing a preamble index and data. In response, the apparatus receives from the network node a second message containing a random access response (RAR) and contention resolution information. The second message is addressed to either a cell radio network temporary identifier (C-RNTI) of the UE or a random access radio network temporary identifier (RA-RNTI).

Abstract: Various solutions for reducing power consumption with wake-up mechanism with respect to user equipment and network apparatus in mobile communications are described. An apparatus may receive a configuration to monitor a wake-up indication (WUI) on predetermined occasions. The apparatus may monitor the WUI according to the configuration. The apparatus may determine whether the WUI is received. The apparatus may monitor a physical downlink control channel (PDCCH) in an event that the WUI is received.

Abstract: Various solutions for channel state information (CSI) reference resource acquisition in discontinuous reception (DRX) with respect to user equipment and network apparatus in mobile communications are described. An apparatus may receive a DRX configuration. The apparatus may receive a CSI-measurement time configuration. The apparatus may turn on a transceiver to receiver a CSI-reference signal (CSI-RS) according to the CSI-measurement time configuration. The apparatus may perform a CSI reporting or beam management according to the CSI-RS. The CSI-RS may be located in an off duration of the DRX configuration.

Abstract: In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a UE. The UE receives a radio bearer configuration. The UE also configures, based on the received radio bearer configuration, a radio bearer including a first logical channel on a first carrier and a second logical channel on a second carrier. The UE further determines whether to activate the radio bearer to perform duplication. In response to a determination to activate the radio bearer to perform duplication, the UE communicates a first packet on the first logical channel and communicates a duplicated first packet on the second logical channel.

Abstract: Various solutions for power-efficient mechanism for multi-link operation with respect to user equipment and network apparatus in mobile communications are described. An apparatus may establish a first link and a second link with at least one of a plurality of network nodes. The apparatus may monitor the first link. The apparatus may stop monitoring the second link. The apparatus may determine whether a condition is triggered on the first link. The apparatus may activate the second link in response to the condition being triggered on the first link.

Abstract: Various solutions for power-saving mechanism by cross-slot scheduling with respect to user equipment and network apparatus in mobile communications are described. An apparatus may determine whether a first condition is triggered. The apparatus may perform a transition from a first power state to a second power state in response to the first condition being triggered. The apparatus may receive downlink information according to a cross-slot scheduling when in the second power state.

Abstract: Various solutions for handling packet data convergence protocol (PDCP) duplication with respect to user equipment and network apparatus in mobile communications are described. An apparatus may determine whether a PDCP entity is associated with two radio link control (RLC) entities. The apparatus may determine whether PDCP duplication is activated. The apparatus may select one of the two RLC entities to transmit a PDCP control protocol data unit (PDU) in an event that the PDCP entity is associated with the two RLC entities and the PDCP duplication is activated.

Abstract: Various solutions for skipping uplink transmission with respect to user equipment and network apparatus in mobile communications are described. An apparatus may determine whether a padding buffer status report (BSR) is included in a protocol data unit (PDU). The apparatus may skip transmission of the PDU when the padding BSR is included in the PDU. The PDU may comprise a medium access control (MAC) PDU. The MAC PDU may comprise no MAC service data unit (SDU).

Abstract: Various solutions for repetition and hybrid automatic repeat request (HARQ) process determination for grant-free transmission with respect to user equipment and network apparatus in mobile communications are described. An apparatus may determine a cyclic shifted version of a base sequence. The apparatus may generate a reference signal based on the cyclic shifted version of the base sequence. The apparatus may transmit a data repetition along with the reference signal on a semi-persistent scheduling (SPS) resource to a network node. The reference signal may be used to identify a repetition index of the data repetition.

Abstract: Various solutions for detecting poor channel conditions for grant-free transmission with respect to user equipment and network apparatus in mobile communications are described. An apparatus may perform a grant-free transmission to transmit at least one of repetitions to a network node. The apparatus may initiate a count value when performing the grant-free transmission. The apparatus may determine whether the count value reaches a threshold value. The apparatus may detect that a poor channel condition is satisfied when the count value reaches the threshold value. The apparatus may perform a channel recovery mechanism in response to the poor channel condition.

Abstract: Various solutions for handling data duplication with respect to user equipment and network apparatus in mobile communications are described. An apparatus may establish a first link and a second link with a network. The apparatus may generate a first protocol data unit (PDU) to transmit on the first link. The apparatus may generate a second PDU to transmit on the second link. The apparatus may transmit the first PDU on the first link. The apparatus may determine whether to discard the second PDU according to a condition. The second PDU may be duplicated from the first PDU.

Abstract: Various solutions for transmission without dynamic scheduling with respect to user equipment and network apparatus in mobile communications are described. An apparatus may receive a configured grant. The apparatus may select an allowed logical channel to use the configured grant. The apparatus may schedule uplink data from the allowed logical channel to a protocol data unit (PDU). The apparatus may transmit the PDU on the configured grant.