A communication system includes: a transmitting-side terminal; a transmitting-side communication apparatus configured to receive data transmitted by the transmitting-side terminal and transmit the received data by radio transmission to a receiving-side communication apparatus; and the receiving-side communication apparatus configured to transmit the data received by radio transmission from the transmitting-side communication apparatus to a receiving-side terminal. The transmitting-side terminal includes a control unit configured to control a transmission speed of the data addressed to the receiving-side terminal based on a first error rate that is an error rate of radio transmission from the transmitting-side communication apparatus to the receiving-side communication apparatus and a second error rate that is an error rate of transmission from the transmitting-side terminal to the receiving-side terminal.

Provided are a method for performing wireless communication by a first device and an apparatus supporting same. The method may comprise the steps of: receiving, from a second device, information related to a zone through a physical sidelink shared channel (PSSCH); obtaining information related to a distance on the basis of a center position of the zone and a position of the first device; and determining whether to transmit HARQ feedback for the PSSCH to the second device on the basis of the information related to the distance.

According to the present invention, a method performed by user equipment is provided, the method is characterized by comprising: receiving a physical sidelink control channel (PSCCH) comprising sidelink control information (SCI) used to schedule transmission of a physical sidelink shared channel (PSSCH) carrying a transport block (TB); determining hybrid automatic repeat request (HARQ) information associated with the TB; and reporting the HARQ information from a physical layer to a medium access control (MAC) sublayer.

A data transmission method and apparatus, and a related device, and may be used in the internet of vehicles, for example, V2X, LTE-V, or V2V, or may be used in fields such as D2D, intelligent driving, and intelligent connected vehicle. A network device may send first downlink control information to a first terminal device and a second terminal device, to indicate the first terminal device and the second terminal device to perform user cooperative transmission in a first stage. After the transmission in the first stage is completed, the network device sends second downlink control information to the first terminal device and the second terminal device, to indicate the first terminal device and the second terminal device to perform user cooperative transmission in a second stage. The network device uses a two-level scheduling manner to improve transmission efficiency in the second stage.

The disclosure provides a method and device in communication node used for wireless communication. A first node receives a first signaling, transmits a first bit block set in a first air interface resource block, receives a second signal in a second air interface resource block, and transmits a third signal in a third air interface resource block. The first signaling is used for determining the first air interface resource block, and the first air interface resource block is used for determining the second air interface resource block; the second signal and the third signal indicate whether the first bit block set is correctly received respectively; the first signaling indicates a first time interval. The above method simplifies the design of downlink signalings for allocation of sidelink resources and reduces signaling overheads.

A method performed by a user equipment (UE) in a wireless communication system is provided. The method includes receiving a physical downlink control channel (PDCCH) associated with a sidelink configured grant type 2, identifying whether a number of consecutive out-of-sync indications are received from lower layer, and starting a timer in case that the number of consecutive out-of-sync indications are received, wherein the UE does not use resources of the sidelink configured grant type 2 while the timer is running.

The disclosure relates to a communication technique and system for converging a 5G communication system for supporting a higher data transfer rate beyond a 4G system with an IoT technology. The disclosure relates to a method performed by a terminal for feeding back a hybrid automatic repeat request (HARQ) and to a terminal for performing the method, including: generating HARQ feedback information for data that is scheduled for the terminal in at least one slot; determining a transmission timing of the HARQ feedback information based on a minimum processing time for transmission of a physical sidelink feedback channel (PSFCH) of the terminal; and transmitting the HARQ feedback information based on the determined timing, wherein the minimum processing time for the PSFCH transmission is determined based on at least one of a subcarrier spacing, a configuration of a resource pool, and a time interval between a PSSCH and the PSFCH.

A method for performing wireless communication by a first device, and a device for supporting same are provided. The method may comprise: transmitting, to a second device, at least one physical sidelink control channel (PSCCH) and at least one physical sidelink shared channel (PSSCH) related to the at least one PSCCH; receiving, from the second device, at least one sidelink (SL) hybrid automatic repeat request (HARQ) feedback information through at least one physical sidelink feedback channel (PSFCH) related to the at least one PSSCH; and determining a priority value of physical uplink control channel (PUCCH) transmission for reporting the at least one SL HARQ feedback information to a base station, based on at least one priority value of the at least one SL HARQ feedback information.

Wireless communications systems and methods related to mechanisms to provide physical sidelink feedback channel (PSFCH) negotiation during sidelink connection establishment. A first UE may determine one or more conditions for PSFCH communications via the sidelink session(s) with the second UE. If the second UE accepts the conditions provided, the first and second UEs complete the sidelink connection. Further, while the first UE has a sidelink communication session with the second UE, a third UE may initiate another sidelink connection with the first UE. The first UE may compare the priority of the proposed sidelink connection with the priority of the ongoing sidelink communication session with the second UE. If the second UE's priority is greater, the first UE will maintain the second UE's status. If less, the first UE may engage in a renegotiation with second UE for the ongoing sidelink communication session to update their PSFCH conditions.

A method for repeating a Transport Block (TB) over multiple transmission occasions. The method includes exchanging specific signaling between a wireless device (e.g., a user equipment) and a network node (e.g., a base station) to repeat same or different redundancy versions of the TB in multiple non-overlapping transmission occasions (e.g., mini-slots) corresponding to multiple Transmission Configuration Indication (TCI) states and having different start positions. More specifically, the network node transmits a Time Domain Resource Allocation (TDRA) to indicate the multiple non-overlapping transmission occasions and the wireless device receives the TDRA indicating the multiple non-overlapping transmission occasions. Accordingly, the wireless device can receive repetition of the TB according to the TDRA. By indicating transmission occasions in the TDRA, it is possible to efficiently schedule multiple transmission occasions over the multiple TCI states, thus helping to improve efficiency, reliability, and coverage in a wireless communications network.