Wireless communications systems and methods related to acknowledgement/negative-acknowledgement (ACK/NACK) transmissions with different reliability levels are provided. A user equipment (UE) receives, from a base station (BS), a negative acknowledgement (NACK) transmission configuration. The UE receives, from the BS, a data transmission. The UE transmits, to the BS, a physical uplink control channel (PUCCH) signal including a NACK for the data transmission based on the received NACK transmission configuration. Other aspects and features are also described.

An operating method of a terminal configured to perform vehicle-to-everything (V2X) communication in a wireless communication system, including signaling a maximum physical sidelink feedback channel (PSFCH) receiving capability to a base station; and receiving a wireless signal transmitted from the base station based on the maximum PSFCH receiving capability, wherein the maximum PSFCH receiving capability is a maximum number of PSFCHs receivable during one time transmission interval (TTI).

Disclosure discloses a method and a device in a node for wireless communications. A first node receives first information; and transmits a first signaling in a first sub-channel; the first information indicates a first resource pool; the first sub-channel is one of L sub-channels, and frequency-domain resource blocks comprised by any one of the L sub-channels belong to the first resource pool; a first candidate sub-channel and a second candidate sub-channel are two different sub-channels among the L sub-channels, a frequency-domain resource block comprised by the first candidate sub-channel and a frequency-domain resource block comprised by the second candidate sub-channel are the same; either of the first candidate sub-channel and the second candidate sub-channel belongs to a target sub-channel group, the target sub-channel group comprising at least one sub-channel. The present disclosure makes full use of all resources available in the sidelink resource pool.

A method for listen-before-talk random access with adaptive energy detection threshold selection is executed by a device. Component units, such as code block groups (CBGs) in a transport block are determined to be retransmitted through a contention-based random access operation. A component unit based energy detection threshold (EDT) is selected. The EDT is associated with the component units determined to be retransmitted. The selected component unit based EDT is used to perform energy detection in an initial contention-based random access operation.

A station apparatus according to the present invention includes a physical layer frame generator configured to selectively use a first coding scheme and a second coding scheme, a transmitter configured to transmit a frame including a control signal, and a higher layer processor configured to configure either the first coding scheme or the second coding scheme for information bits included in the frame, based on the control information, wherein the control signal includes first information indicating whether a reception method for changing a carrier sense level is allowed for a communication apparatus that receives the frame.

A station apparatus according to the present invention includes a physical layer frame generator configured to selectively use a first coding scheme and a second coding scheme, a transmitter configured to transmit a frame including a control signal, and a higher layer processor configured to configure either the first coding scheme or the second coding scheme for information bits included in the frame, based on the control information, wherein the control signal includes first information indicating whether a reception method for changing a carrier sense level is allowed for a communication apparatus that receives the frame.

Apparatus and methods are provided for group scheduling configuration and uplink HARQ configuration for the NR multicast services. In one novel aspect, the UE receives broadcasts the SIB message related to multicast transmission, receives multicast control information via RRC message, and configures the uplink HARQ feedback. In one embodiment, the SIB message includes control Resource Set and/or search space for MB-RNTI scramble. The multicast control information includes control Resource Set and/or search space within the MTCHinfolist G-RNTI scramble. The multicast control information includes one or more elements including MTCH index, uplink HARQ feedback request to inform the concerned UE(s) the HARQ feedback is disabled or enabled, the timing information between PDSCH and the uplink PUCCH feedback resource, the option of HARQ based feedback, one or a set of PUCCH resource or PUCCH resource instance, and an MTCH retransmission timer.

This application provides a DAI counting method, a DAI counting control method, a terminal, and a network device. The method includes: in a case that physical downlink control channel PDCCH repetition is configured, incrementing a DAI count at a reference PDCCH monitoring occasion.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may reserve a transmission resource for transmitting a transmission block (TB) via a sidelink communication; reserve a retransmission mission resource for retransmitting the TB, wherein the retransmission resource is reserved such that at least one hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback occasion occurs between transmission of the TB and a first retransmission of the TB; and communicate with another UE via the sidelink communication based at least in part on the transmission and retransmission resources. Numerous other aspects are provided.

Embodiments of this application describe a retransmission timeout (RTO) determining method and a related apparatus. The method includes a transmission device sending, to a network analyzer, a network throughput at which communication is performed through a first communication connection, where the network throughput is used by the network analyzer to determine an RTO corresponding to the first communication connection. The network analyzer obtains a first network throughput at which the transmission device performs communication through the first communication connection. The network analyzer calculates, based on the first network throughput, a first RTO corresponding to the first communication connection. The network analyzer sends the first RTO to the transmission device. The transmission device receives the first RTO sent by the network analyzer. The embodiments of this application help improve efficiency of retransmitting a lost data packet.