One embodiment according to the present specification relates to a method for performing low latency communication. A transmitting STA can transmit a low latency communication notification frame including information related to a section for low latency communication. The transmitting STA and a receiving STA can perform low latency communication in the section for low latency communication on the basis of the low latency communication notification frame. Afterward, the transmitting STA can transmit a low latency communication termination frame. The transmitting STA and the receiving STA can terminate the section for low latency communication on the basis of the low latency communication termination frame.

A wireless device receives configuration parameters of a primary cell and a secondary cell. In response to the secondary cell cross-carrier scheduling the primary cell, the wireless device determines radio link monitoring reference signals based on: one or more first control resource sets (coresets) of the primary cell and one or more second coresets of the secondary cell. The wireless device measures the radio link monitoring reference signals for radio link monitoring of the primary cell.

The present disclosure relates to a communication technique that merges IoT technology with a 5G communication system for supporting higher data transmission rates than 4G systems, and a system for same. The present disclosure may be applied to intelligent services (for example, smart homes, smart buildings, smart cities, smart cars or connected cars, healthcare, digital education, retail business, security and safety-related services, etc.) on the basis of 5G communication technology and IoT-related technology. The invention of the present disclosure is a method performed by a terminal of a communication system, the method being characterized by comprising receiving physical uplink control channel (PUCCH) setting information from a base station, receiving a downlink control channel (DCI) which schedules downlink data from the base station, receiving the downlink data, and repeatedly transmitting, to the base station, hybrid automatic repeat request acknowledgement (HARQ-ACK) information for the downlink data on the PUCCH, wherein the PUCCH setting information includes at least one piece of information among a plurality of PUCCH formats for repeatedly transmitting the PUCCH, a set of one or more start symbols, a set of one or more numbers of PUCCH symbols, and the total number of slots or symbols for finishing the PUCCH repetition.

Data including a plurality of blocks is received from a communication apparatus 102. A communication time of retransmission data which is a part of the received data and which is to be retransmitted by the communication apparatus 102 and a communication time of a response signal to be transmitted by the communication apparatus 103 are acquired. The response signal in which a communication reservation time is set is transmitted wherein the communication reservation time includes the communication time of the retransmission data and the communication time of the response signal.

Aspects relate to implementing a non-dropping rule for mini-slot based repetition of downlink channel data or control. In one example, cancelled repetition may be identified, non-cancelled remaining repetitions may be received, and acknowledgment feedback based on reception results may be generated. In another example, a plurality of time domain resource allocation (TDRA) candidate occasions may be identified where each occasion occurs within a different respective one of a plurality of mini-slots, each mini-slot carrying a different respective one of a plurality of downlink channel repetitions. A TDRA table may be maintained. The TDRA table may include TDRA entries such as location information of the plurality of TDRA candidate occasions associated with the plurality of downlink channel repetitions. The TDRA table may be maintained when at least one of the plurality of downlink channel repetitions is not decoded. A wireless communication device may refrain from dropping non-decoded downlink channel repetitions.

A method for determining PSFCH resources, a method for configuring PSFCH resources, and a communications device, and the method for determining PSFCH resources includes: determining PSFCH resources in a target object based on obtained PSFCH resource configuration information, where the target object includes at least one of the following: a carrier, a bandwidth part BWP, and a resource pool, and the PSFCH resources include PSFCH transmission resources, or PSFCH reception resources, or both PSFCH transmission resources and PSFCH reception resources; and performing a target operation on feedback information on the PSFCH resources, where the target operation includes at least one of a reception operation and a transmission operation.

The present application discloses a DAI configuration method and device, a DAI indication method and device, a DAI sending method and device, and a medium, which relate to the field of mobile communications. The DAI configuration method comprises: determining a first bit of a first counting DAI in a first DCI format; receiving configuration information, the configuration information being used for configuring a second bit of a second counting DAI in a second DCI format, the PDSCH receipt or the SPS release scheduled in the first DCI format and the PDSCH reception or the SPS release scheduled in the second DCI format feeding back HARQ-ACK in the same HARQ-ACK codebook. Furthermore, the first bit and the second bit are the same, and when subsequently determining the position of HARQ-ACK according to a counting DAI field, a terminal device can ensure the accuracy of determining the position of HARQ-ACK.

Embodiments of this application disclose a retransmission method and an apparatus in a multi-transmission reception point architecture, to improve HARQ retransmission performance in the multi-TRP architecture. The method includes: receiving first downlink control information from a network device on a first control resource; and receiving a first transmission version of downlink data from the network device based on the first downlink control information. The first transmission version is retransmission data of a second transmission version of the downlink data. Second downlink control information for scheduling the second transmission version is associated with a second control resource. The first control resource and the second control resource are a same control resource, or the first control resource and the second control resource belong to a same resource group.

A feedback information sending method and an apparatus are provided. The method includes: A network device sends, to a terminal device, M pieces of DCI for scheduling N transmissions of first data, values in DAI fields comprised in all of the M pieces of DCI are the same; and the terminal device sends feedback information of the first data to the network device, wherein the feedback information is comprised in an HARQ-ACK codebook, and a location of the feedback information in the HARQ-ACK codebook is determined based on a DAI field in first DCI of the M pieces of DCI.

Feedback information sending methods and apparatuses are provided in this disclosure. One method includes receiving, from a network device, M pieces of downlink control information (DCI) for scheduling transmissions of N pieces of data, the M pieces of DCI comprise first DCI and second DCI, determining, based on resource indication information in third DCI, a time-frequency resource for sending a hybrid automatic repeat request-acknowledgement (HARQ-ACK) codebook that comprises feedback information for N pieces of data corresponding to N pieces of DCI of the M pieces of DCI, and sending the HARQ-ACK codebook to the network device on the time-frequency resource.