Methods, systems, and computer readable media for measuring data integrity in time sensitive networks. An example method for testing a time sensitive network (TSN) device includes calculating a data integrity value for a preemptable frame. The method includes appending the data integrity value to an end of the preemptable frame and transmitting the preemptable frame to the TSN device, causing the TSN device to fragment the preemptable frame or to reassemble the preemptable frame after fragmentation. The method includes receiving the preemptable frame after traversing the TSN device and validating the data integrity value of the preemptable frame after traversing the TSN device.

A user equipment includes a receiving unit configured to receive a first signal of inter-terminal direct communication transmitted from a first user equipment, and information indicating a first resource for transmitting a HARQ (Hybrid Automatic Repeat Request) response corresponding to the first signal of inter-terminal direct communication transmitted from either one of a base station apparatus or the first user equipment; a control unit configured to determine the HARQ response based on a reception result of the first signal of inter-terminal direct communication; and a transmitting snit configured to transmit the determined HARQ response to the base station apparatus or the first user equipment, by using the first resource for transmitting the HARQ response.

Methods, systems, and devices for wireless communications are described. Transport blocks may be scheduled using a single downlink control information (DCI) message. A wireless device may identify mapping pattern for mapping the transport blocks and repetitions of the transport blocks to communication resources. Mapping the transport blocks, or determining a mapping of the transport blocks, to communication resources may include partitioning the communication resources into subunits, where each subunit includes resources spread across each subband of a frequency hopping pattern and at least one instance of each of the scheduled transport blocks.

Devices and systems of sensing, resource selection and control signaling for feedback-less and feedback-based NR-V2X sidelink communication are described. Resource reservation and selection for sidelink retransmissions based on HARQ feedback are described for unicast, groupcast, and broadcast blind retransmissions. After exchanging HARQ feedback capability information for different types of communications, a HARQ-dependent or HARQ-independent resource selection occurs. Look-ahead and/or chain-based resource selection and reservation signaling is used, in which a single resource or some or all of the resources selected are signaled as reserved. Further resource selection of a single additional resource may occur after an initial resource selection. The resource selection for retransmissions may be adapted using a RSRP or distance threshold.

Embodiments of the present application relate to a method and apparatus for hybrid automatic repeat request-acknowledge (HARQ-ACK) feedback for carrier aggregation (CA). A method according an embodiment of the present application may include receiving at least one downlink transmission; generating a first HARQ-ACK sub-codebook for the at least one downlink transmission; determining whether to generate a second HARQ-ACK sub-codebook; and transmitting a HARQ-ACK codebook. The HARQ-ACK codebook includes the first HARQ-ACK sub-codebook in response to the second HARQ-ACK sub-codebook determined not to be generated, or includes the first HARQ-ACK sub-codebook and the second HARQ-ACK sub-codebook in response to the second HARQ-ACK sub-codebook determined to be generated. The present application avoids misunderstanding between a base unit and a remote unit when generating the HARQ-ACK feedback for CA.

A re-transmission control method of downlink data to be transmitted from a radio base station to a radio terminal includes: by the radio terminal, transmitting information regarding decoding performance of the radio terminal to the radio base station; receiving the downlink data from the radio base station; transmitting a re-transmission request of the downlink data to the radio base station in a case where an error in the downlink data is detected; receiving a re-transmission configuration based on the information regarding decoding performance of the radio terminal, from the radio base station in a physical downlink control channel (PDCCH), after transmission of the re-transmission request; receiving the downlink data re-transmitted from the radio base station; and decoding the re-transmitted downlink data in accordance with the re-transmission configuration.

In a data packet transmission method disclosed herein, a capability information value indicating an amount of data that can be supported by a data transmission end is determined. In response to determining that a data packet is not received correctly, a data packet to be retransmitted is determined and is retransmitted according to the capability information value.

Proposed is a method for performing wireless communication by a first device. The method may comprise a step of: transmitting a physical sidelink shared channel (PSSCH) through a resource selected in a first time area to a second device; receiving a physical sidelink feedback channel (PSFCH) related to the PSSCH from the second device; and on the basis that the interval between the first time area and a second time area is larger than a preconfigured threshold value, selecting a resource in the second time area to retransmit the PSSCH to the second device. For example, the first time area may precede the PSFCH. For example, the second time area may follow the PSFCH.

This disclosure provides a data retransmission method and apparatus. The method includes: A transmitting device obtains information to be transmitted for a t.sup.th time, where the information to be transmitted for the t.sup.th time includes R.sub.t extension locations and information to be transmitted for a (t−1).sup.th time, and the extension locations include M.sub.t information bits and L.sub.t check bits corresponding to the M.sub.t information bits. The transmitting device then performs Polar encoding on the information to be transmitted for the t.sup.th time, to obtain a codeword after the Polar encoding, obtains a codeword for (t−1).sup.th retransmission based on the codeword after the Polar encoding, and transmits the codeword for (t−1).sup.th retransmission. A receiving device performs polar decoding after receiving the codeword for (t−1).sup.th retransmission, to obtain a decoding result of codewords for t times of transmission. By performing, on an encoding side, check encoding on the information bits in an extension part, a decoding path can be reduced in a decoding process, thereby greatly reducing decoding complexity, and reducing storage overheads and calculation overheads.

Provided are a random access method, a terminal device and a network device. The random access method includes transmitting a two-step random access request message to a network device. A data part is carried in the two-step random access request message, and the data part is acquired through performing layer-two processing in accordance with layer-two configuration information.