Abstract: A control channel transmission method and a communication apparatus, where the method comprises: receiving indication information, where the indication information indicates a first physical downlink control channel (PDCCH) candidate set; receiving first downlink control information (DCI); and monitoring second DCI on a second PDCCH candidate set, where the second PDCCH candidate set is determined based on the first DCI, and the second PDCCH candidate set belongs to the first PDCCH candidate set.

Abstract: A control information transmission method and a communication apparatus. A downlink control information (DCI) is carried on a physical downlink control channels (PDCCH). A position of a time domain symbol used for carrying the DCI on the PDSCH may be determined based on a position of a time domain symbol carrying a demodulation reference signal (DMRS) on the PDSCH.

Abstract: A secondary cell activation method and a communication apparatus. A terminal device receives first information from a network device. The first information is usable to indicate a start location of a 1st reference signal burst of a secondary cell in a frame in which the 1st reference signal burst is located and an interval between two adjacent reference signal bursts. The terminal device receives a reference signal burst #i of the secondary cell. The terminal determines an index value of the reference signal burst #i based on a receive time of the reference signal burst #i and the interval between two adjacent reference signal bursts. The terminal performs cell search based on the index value of the reference signal burst #i, the start location of the 1st reference signal burst in the frame, and the interval between two adjacent reference signal bursts.

Abstract: This application provides a resource configuration method. The method includes: A terminal device receives a channel state information CSI reporting configuration from a network device, where the CSI reporting configuration includes N fields, the N fields are in one-to-one correspondence with N CSI resource configurations, a first field in the N fields indicates a first carrier associated with a first CSI resource configuration that is in the N CSI resource configurations and that corresponds to the first field, the N CSI resource configurations are associated with N carriers, and N is a positive integer greater than 1; the terminal device obtains CSI based on the CSI reporting configuration; and the terminal device sends the CSI to the network device.

Abstract: A communication method comprises providing first indication information in single downlink control information (DCI) that indicates that an active bandwidth part (BWP) of a first secondary cell is a first dormant BWP, so as to indicate a secondary cell that enters a dormant state. In addition, N scheduled cells may be indicated using second indication information in the single DCI, where the N scheduled cells do not include the first secondary cell.

Abstract: This application provides a secondary cell activation method and a communication apparatus. The method includes: A terminal device receives first information from a network device, where the first information indicates a start location of a reference signal burst of a secondary cell and an interval between two adjacent reference signal bursts; and further, the terminal device receives the reference signal burst from the secondary cell based on the start location and the interval, and performs automatic gain control settling, cell search, or layer 1 reference signal received power measurement based on the reference signal burst.

Abstract: A method and an apparatus for switching a cell state are provided, and relate to the field of communication technologies. The method includes: A terminal device receives a first instruction from a network device, and switches a serving cell state based on the first instruction. The first instruction indicates to switch the serving cell state of the terminal device to or from a first state. When the serving cell state is the first state, a downlink carrier of a serving cell supports downlink communication, and an uplink carrier of the serving cell does not support uplink communication.

Abstract: Communication method and communication apparatus. In a scenario of a multi-cell scheduling DCI format, a network device determines whether a reference cell of the multi-cell scheduling DCI format is a primary cell, and sends the configuration to a terminal device. The terminal device determines, depending on whether the reference cell of the multi-cell scheduling DCI format is a primary cell, whether to use overbooking processing.

Abstract: This application provides a data transmission method and an apparatus, and may be applied to fields such as user equipment cooperation, sidelink relay, user relay, and internet of vehicles. A first terminal apparatus receives at least two pieces of downlink control information from a first network apparatus in a first slot, where the at least two pieces of downlink control information include first downlink control information and second downlink control information, the first downlink control information is used to indicate a first sidelink resource used by the first terminal apparatus to send first sidelink information to a second terminal apparatus, and the second downlink control information is used to indicate a second sidelink resource used by the first terminal apparatus to send second sidelink information to a third terminal apparatus.

Abstract: A method for determining a reference signal sequence, a terminal device, and a network device, the including receiving, by a terminal device, first indication information sent by a network device, determining, by the terminal device, a target resource based on the first indication information, determining, by the terminal device, a reference signal sequence based on parameters of a first bandwidth and parameters of a second bandwidth, and sending or receiving, by the terminal device, the reference signal sequence on the target resource.

Abstract: A communication method includes receiving first data from a network device or a terminal device, and demapping the first data based on a first frequency hopping pattern. The first frequency hopping pattern is one of K candidate frequency hopping patterns. One candidate frequency hopping pattern in the K candidate frequency hopping patterns includes L frequency hopping portions. At least two candidate frequency hopping patterns in the K candidate frequency hopping patterns include a same frequency hopping portion, K is an integer greater than 1, and L is an integer greater than 1.

Abstract: This application provides example downlink control information (DCI) transmission methods and apparatuses. One example method includes receiving first cross carrier scheduling configuration information, wherein the first cross carrier scheduling configuration information indicates a terminal device to monitor a first downlink control information (DCI) format, and where the first DCI format can be used to schedule data transmission of two or more cells. When a first cell is in an inactive mode or a dormancy mode, a quantity of information bits of the first DCI format are determined based on a first bandwidth part (BWP) of the first cell. The first DCI format is then monitored based on the determined quantity of information bits of the first DCI format.

Abstract: Embodiments of this application provide a cell scheduling method, wherein a terminal device receives a downlink control information format from a network device; and the terminal device determines, whether at least one cell in the plurality of cells are scheduled based on a combination of the first indicator field and the fourth indicator field in the downlink control information format.

Abstract: A downlink control information detection method and a related apparatus are provided. The method includes: For first downlink control information DCI for scheduling data channels of a plurality of cells, a terminal determines a target cell corresponding to the first DCI, to count a size budget of the first DCI on the target cell, so that a count value of a size budget of DCI on the target cell does not exceed a preset threshold. A payload size of the first DCI is different from that of second-type DCI for scheduling a data channel of one cell. Further, the terminal performs blind detection for the first DCI based on the payload size of the first DCI.

Abstract: This application provides an uplink transmission method. A network device sends configuration information of N bands, first information, second information and third information to a terminal, where the first information indicates to perform uplink transmission in a first time unit by using M first bands, the second information indicates to perform uplink transmission in a second time unit by using K second bands, the third information indicates to perform uplink transmission in a third time unit by using L third bands, where when a quantity of bands in a union set of the M first bands, the K second bands, and the L third bands is greater than S, and the first threshold is greater than 0, a time interval between a start moment of the third time unit and a start moment of the second time unit is greater than or equal to the first threshold.

Abstract: This application provides a HARQ-ACK codebook feedback method and a communication apparatus. The method includes: A network device sends one piece of DCI to a terminal, where the DCI is used to schedule Ni data channels in a plurality of cells, and the DCI includes a counter-downlink assignment index C-DAI. The terminal determines, based on the C-DAI, an arrangement order of HARQ feedback information of the N1 data channels in a HARQ-ACK codebook, and feeds back the HARQ-ACK codebook to the network device.

Abstract: This application provides a channel state information (CSI) feedback method and apparatus. In the method, configuration information indicates an association relationship between a plurality of frequency bands and a plurality of TRPs. The plurality of TRPs are associated with a first frequency band, and at least one TRP in the plurality of TRPs is further associated with a second frequency band. In this way, a terminal can feed back, in a targeted manner, CSI corresponding to the plurality of TRPs associated with each frequency band by using coherent joint transmission, for example, CSI corresponding to the plurality of TRPs on the first frequency band, and CSI corresponding to the at least one TRP on the second frequency band.

Abstract: A communication method includes receiving first information from a network device. The first information is used to configure M communication parameter groups corresponding to N candidate carriers, N is an integer greater than or equal to 1, and M is greater than or equal to N. The communication method also includes receiving second information from the network device. The second information indicates at least one communication parameter group in the M communication parameter groups. The communication method further includes performing communication on at least one carrier based on the at least one communication parameter group, wherein the N candidate carriers comprise the at least one carrier.

Abstract: This application provides example uplink transmission methods and communication apparatuses. One example method includes sending first scheduling information by a network device to a first terminal and a second terminal, where the first scheduling information includes indication information of a sidelink transmission parameter and indication information of a first uplink transmission parameter, the sidelink transmission parameter is used by the first terminal to send first data to the second terminal, and the first uplink transmission parameter is used by the second terminal to send the first data to the network device. The first data is received by the network device from the second terminal.

Abstract: A configuration information sending method and an apparatus is applied to fields such as user cooperation, user relay, and an internet of vehicles. First configuration information is sent to a first user group, where the first configuration information indicates at least one resource element, the first user group includes a first terminal apparatus and a second terminal apparatus, and the first terminal apparatus is configured to assist in information transmission between a first network apparatus and the second terminal apparatus. The first network apparatus sends first downlink control information to the first user group, where the first downlink control information indicates a first resource element in the at least one resource element and a first time-frequency resource, and the first time-frequency resource belongs to the first resource element.