Abstract: A signal transmission method and an apparatus. A first time domain resource is determined based on a first frequency domain resource, a second frequency domain resource, a period length, and a period index, where the first frequency domain resource is selected from a plurality of candidate frequency domain resources, and the second frequency domain resource is a frequency domain resource for sending a reference signal in a first period or a frequency domain resource determined based on a configuration parameter. The reference signal is sent on the first frequency domain resource and the first time domain resource. In this way, a plurality of candidate frequency domain resources can be provided for reference signals to be periodically sent, to increase a possibility of sending the reference signal, and improve sensing performance.

Abstract: A first transmitting terminal sends a first channel state information-reference signal CSI-RS in N frequency domain units, where N is a positive integer. The first transmitting terminal detects channel state information CSI sent by K receiving terminals, where the CSI sent by the K receiving terminals is determined based on the first CSI-RS, and K is a positive integer. The first transmitting terminal updates a transmit power of the first transmitting terminal in the N frequency domain units based on the CSI sent by the K receiving terminals. When updated powers of F frequency domain units in the N frequency domain units are greater than a preset threshold, the first transmitting terminal sends user data in at least one of the F frequency domain units, where F is a positive integer less than or equal to N.

Abstract: A positioning signal sending method and apparatus are provided. A first signal is generated, where duration of a first rising edge of the first signal is less than duration of a first falling edge, the duration of the first rising edge is duration of a rising edge of a main lobe waveform of the first signal, and the duration of the first falling edge is duration of a falling edge of the main lobe waveform of the first signal; and the first signal is sent. In embodiments of this application, rising time of a main lobe waveform of a signal generated is short, and shorter rising time of the main lobe waveform is more conducive to distinguishing two adjacent paths or identifying a first arrival path of a received signal.

Abstract: This application discloses a joint source-channel encoding method and an information exchange method that are used during wireless data transmission. In the method, through information exchange between an access network, a core network, and a server, the access network can perform joint source-channel encoding on service data, and the access network can further jointly optimize a source-channel encoding parameter with reference to a channel condition, to adapt to different channel conditions of a terminal in real time, so that transmission efficiency of data during wireless transmission is high.

Abstract: A data transmission method and a communication apparatus. A first terminal device sends a first TB to a second terminal device on a first resource through a sidelink, and sends a second TB to a network device on a second resource through an uplink, where both the first TB and the second TB correspond to a first RLC PDU set. After receiving a HARQ feedback for the first TB from the second terminal device, the first terminal device or the network device may determine, based on the HARQ feedback, whether the network device sends an RLC PDU in the first RLC PDU set to the second terminal device.

Abstract: This application provides a sidelink communication method and a communication apparatus. According to this application, a first terminal device may multiplex MAC SDUs sent to a plurality of second terminal devices into one first TB, and transmit the first TB on one PSSCH resource. In addition, the first terminal device may further send first indication information to the plurality of second terminal devices, to indicate whether the first TB sent by the first terminal device includes a MAC SDU corresponding to each second terminal device.

Abstract: In accordance with an embodiment, a communication method includes: sending, by a first device, a first reference signal of M (M>2) ports; and receiving, by the first device, first indication information that indicates a first precoding matrix in a target codebook. The first precoding matrix is associated with the first reference signal, and the target codebook includes at least one target precoding matrix that is a partially coherent precoding matrix or a coherent precoding matrix.

Abstract: Embodiments of this application provide a sidelink communication method and an apparatus. The method includes: A first terminal device determines one or more first resources, where the first resource is used by a plurality of terminal devices to send feedback information, and the feedback information indicates a data receiving status or a data retransmission request. The first terminal device sends first indication information to a second terminal device, where the first indication information indicates time-frequency resource location information of the one or more first resources, and indicates that the first resource is used by the plurality of terminal devices to send the feedback information, and the second terminal device is one of the plurality of terminal devices.

Abstract: A terminal device determines configuration information used to configure a first resource pool. The first resource pool includes Ml first-type time domain units and M2 second-type time domain units, each of the M1 first-type time domain units corresponds to N1 first-type frequency domain units in the first resource pool, each of the M2 second-type time domain units corresponds to N2 second-type frequency domain units in the first resource pool, a bandwidth of each first-type frequency domain unit is the same as a bandwidth of each second-type frequency domain unit, and N2 is greater than N1.

Abstract: This application relates to a communication method and apparatus. A terminal device determines, from a first resource pool, a first resource used to send sidelink information, where the first resource pool includes N frequency domain units. Each of the N frequency domain units includes a first frequency domain subunit, a second frequency domain subunit, and a third frequency domain subunit, or a 1st frequency domain unit in the N frequency domain units includes a second frequency domain subunit and a third frequency domain subunit, and/or an Nth frequency domain unit in the N frequency domain units includes a first frequency domain subunit and a third frequency domain subunit, and each of a 2nd frequency domain unit to an (N?1)th frequency domain unit in the N frequency domain units includes a first frequency domain subunit, a second frequency domain subunit, and a third frequency domain subunit.

Abstract: The present disclosure relates to communication methods and apparatuses in a sidelink communication system. In one example method, a first terminal device determines a first resource based on an obtained automatic gain control (AGC) processing capability of a second terminal device, and sends sidelink information to the second terminal device on the first resource. A slot structure is reconfigured based on the AGC processing capability of the second terminal device.

Abstract: This application provides a communication method and an apparatus, which are applicable to a sidelink communication scenario. A method includes a first terminal device receives data sent by a second terminal device, and sends feedback information to the second terminal device through a PSSCH based on a receiving status of the data.

Abstract: This application relates to a communication method and apparatus. The method includes: modulating first data to obtain a first UWB frame, where the first data includes a plurality of bits, the first UWB frame includes one or more modulation symbols, a first modulation symbol is any one of the one or more modulation symbols, the first modulation symbol represents M bits of the plurality of bits, the first modulation symbol includes pulse signals of K frequencies, M is an integer greater than or equal to 2, and K is an integer less than or equal to M and greater than or equal to 0; and sending the first UWB frame.

Abstract: A communication method includes a first device that generates a first ultra-wide band (UWB) frame, and sends the first UWB frame on a first channel. A first field of the first UWB frame includes a first-type preamble symbol, a second field of the first UWB frame includes a second-type preamble symbol, the first field is a first synchronization field in a synchronization header of the first UWB frame, and the second-type preamble symbol is used to perform channel access or resource selection. The first-type preamble symbol has a first-type format, and the second-type preamble symbol has a specific second-type format.

Abstract: In a method, a terminal device reports, to a network device, a full-power transmission codebook subset corresponding to a frequency band supported by the terminal device before transmission channel switching. The network device or the terminal device in a communications system may determine, according to a specified rule and full-power transmission codebook subsets corresponding to a plurality of source frequency bands, a full-power transmission codebook subset corresponding to a target frequency band after transmission channel switching. The plurality of source frequency bands are frequency bands in which a plurality of target antenna ports are located before antenna port switching, and the plurality of target antenna ports are antenna ports in the target frequency band after antenna port switching.

Abstract: The present disclosure relates to beam training methods and communication apparatuses. In one example method, a first UE sends first control information by using a first transmission beam, where the first control information includes resource location information of a first resource. Then, the first UE sends a first reference signal on the first resource by using M transmission beams, where M is a positive integer, the first transmission beam is different from each of the M transmission beams, and the first transmission beam covers each of the M transmission beams.

Abstract: In accordance with an embodiment, a method includes sending a first message to a network device includes capability information of a terminal device that indicates antenna ports supported by P frequency domain units of the terminal device, and an antenna port supported by an ith frequency domain unit in the P frequency domain units includes an antenna port associated with the ith frequency domain unit and an antenna port that can be switched to the ith frequency domain unit in antenna ports associated with Ni frequency domain units in the P frequency domain units; and receiving configuration information from the network device, where the configuration information configures at least two sounding reference signal (SRS) resources for a first frequency domain unit of the terminal device, and the first frequency domain unit is associated with first uplink transmission configuration information.

Abstract: The present disclosure relates to communication methods. In an example communication method, a first terminal device sends, in a first time unit, a first reference signal used for channel measurement to a second terminal device, where the first time unit is before a second time unit and is associated with the second time unit, and the second time unit is a time unit in which the first terminal device and the second terminal device perform sidelink (SL) transmission. The first terminal device receives, in a third time unit, first feedback information sent by the second terminal device, where the first feedback information is determined by the second terminal device based on the first reference signal, the first feedback information is used to determine a parameter for the SL transmission, and the third time unit is after the first time unit and before the second time unit.

Abstract: This application relates to an information processing method and device. A first device determines a first source coding rate. The first device determines a source coding matrix based on the first source coding rate and a channel coding basis matrix. The first device inputs a source sequence into the source coding matrix, to perform source coding on the source sequence. In embodiments of this application, the source coding matrix may be determined based on the channel coding basis matrix, which is equivalent to determining source coding information based on channel coding information, to implement joint source and channel coding. Through the joint source and channel coding, a quantity of output bits of source coding can match a quantity of input bits of channel coding, so that technical solutions in embodiments of this application can be adapted to a 5G NR system.

Abstract: A positioning signal sending method and apparatus are provided. A first signal is generated, where duration of a first rising edge of the first signal is less than duration of a first falling edge, the duration of the first rising edge is duration of a rising edge of a main lobe waveform of the first signal, and the duration of the first falling edge is duration of a falling edge of the main lobe waveform of the first signal; and the first signal is sent. In embodiments of this application, rising time of a main lobe waveform of a signal generated is short, and shorter rising time of the main lobe waveform is more conducive to distinguishing two adjacent paths or identifying a first arrival path of a received signal.