Abstract: This application discloses a tag positioning method. In this application, a target tag receives first signaling sent by a target reader/writer, where the first signaling includes an identity ID of a first transmitter. The target tag sends second signaling to the target reader/writer, where the second signaling includes the ID of the first transmitter. Further, the target reader/writer may determine, based on the ID that is of the first transmitter and that is included in the signaling sent by the target tag, a coverage area that is of a transmitter and in which the target tag is located, to more accurately determine a location of the tag. Therefore, efficiency of tag positioning is improved.

Abstract: A method includes receiving, by a first device, first signaling from a second device, wherein the first signaling is useable to indicate that the second device successfully received first identity information from the first device and is useable to indicate to the first device to send second identity information to the second device, the first signaling comprises a first inventory identifier, and the first inventory identifier is useable to indicate an identifier of an ongoing inventory process of the second device. The method further includes determining, by the first device based on the first signaling, that the first inventory identifier is the same as a second inventory identifier, wherein the second inventory identifier is useable to indicate an identifier of an ongoing inventory process of the first device. The method further includes sending, by the first device, the second identity information to the second device.

Abstract: A sensing communication method and an apparatus that may resolve a problem of mutual interference caused when different readers use a same resource to communicate with a tag. A network device schedules a sensing resource of the reader to the reader. The reader sends a sensing signal based on the scheduled sensing resource, and senses a sensing signal of another reader, to obtain a sensing result. The reader sends the sensing result. The reader receives information for determining a resource for communication between the reader and the tag. The reader uses the communication resource to communicate with the tag. The sensing resource is scheduled by the network device, so that communication efficiency between the reader and the tag can be improved.

Abstract: This application discloses a method for selecting a plurality of carriers and a related device. The method includes: obtaining, by a first terminal, first configuration information, where the first configuration information includes at least one piece of first carrier information and corresponding first channel congestion parameter information; obtaining first data; selecting at least one direct link transmission carrier for the first data according to the first carrier information and in a priority sequence based on the first channel congestion parameter information; and sending the first data on the direct link transmission carrier.

Abstract: A synchronization method includes: determining a data signal, where a target sequence in the data signal is mapped to at least one symbol that includes the first symbol within a time unit, data in the data signal is mapped to at least one another symbol in the time unit other than the at least one symbol, the first symbol includes a cyclic prefix, and the target sequence is used by a second device to synchronize the data signal; and sending the data signal to the second device in the time unit. In the present disclosure, a sequence used to synchronize a data signal for each transmission is mapped at an equal spacing to at least one symbol that includes the first symbol within a time unit for the current transmission.

Abstract: This application discloses a method for selecting a plurality of carriers and a related device. The method includes: obtaining, by a first terminal, first configuration information, where the first configuration information includes at least one piece of first carrier information and corresponding first channel congestion parameter information; obtaining first data; selecting at least one direct link transmission carrier for the first data according to the first carrier information and in a priority sequence based on the first channel congestion parameter information; and sending the first data on the direct link transmission carrier.

Abstract: This application provides a communication method and a terminal device. The communication method may include determining, by user equipment (UE), a candidate resource set on a first carrier, where the first carrier is a carrier on which a resource is currently to be selected, and the first carrier is used to transmit first data.

Abstract: Example scheduling assignment information transmission methods, systems, and devices are described. One example method includes obtaining, by a user equipment (UE), a multiplexing manner used to indicate a relationship between a time-frequency resource for transmitting scheduling assignment information and a time-frequency resource for transmitting data information. The UE receives downlink control information comprising scheduling assignment resource indication information sent by a network device, and obtains, based on the scheduling assignment resource indication information and the multiplexing manner, resource location information occupied to transmit the scheduling assignment information. The UE can then transmit the scheduling assignment information based on the resource location information occupied by the scheduling assignment information.

Abstract: Embodiments of the present disclosure relate to the field of vehicle to vehicle communications technologies, and provide a resource energy determining method and apparatus. An example method includes: obtaining, by first user equipment (UE), time-frequency resource indication information and resource cycle reservation information of second UE in a sensing time window of the first UE; determining, by the first UE, energy of a first resource based on the time-frequency resource indication information of the second UE; and determining, by the first UE, where a time-frequency domain location of the first resource in a transmission period in which the first resource is located is the same as a time-frequency domain location of each of the at least one second resource in a transmission period in which the second resource is located.

Abstract: This application discloses a method for selecting a plurality of carriers and a related device. The method includes: obtaining, by a first terminal, first configuration information, where the first configuration information includes at least one piece of first carrier information and corresponding first channel congestion parameter information; obtaining first data; selecting at least one direct link transmission carrier for the first data according to the first carrier information and in a priority sequence based on the first channel congestion parameter information; and sending the first data on the direct link transmission carrier.

Abstract: The present disclosure provides a data sending method. A first terminal device, determines at least two carriers to transmit at least two pieces of data corresponding to a same transport block, and in a one-to-one correspondence with the at least two pieces of data. The at least two pieces of data can be sent by the first terminal to a second terminal device or a network device by using the at least two carriers. When the first terminal device sends data, the first terminal device may send the at least two pieces of data to the second terminal device or the network device on the at least two carriers to improve reliability of data transmission. The at least two pieces of data may be sent simultaneously, to avoid an increased latency by transmissions of the at least two pieces of data in different time units.

Abstract: The present disclosure relates to reference signal sending or receiving methods and systems, terminal devices, and access network devices. One example method includes sending, by a first device, first control information to a second device, where the first control information is used to indicate a first resource used by the first device to send a reference signal, and sending, by the first device, the reference signal to the second device on the first resource.

Abstract: The present disclosure relates to communication methods and communications apparatus. In one example communication method, a first terminal determines a start time unit of a resource period, and transmits communication data in the resource period, where communication data is transmitted in the start time unit and the communication data is retransmitted in another time unit of the resource period. Then the first terminal sends transmission sequence number indication information and time domain transmission resource indication information to a second terminal that performs direct communication with the first terminal.

Abstract: This application provides a terminal mode obtaining method and apparatus, and a device. The method includes: obtaining, by a first terminal device, at least two types of terminal information comprising terminal information of terminal devices that can use a shared resource pool, where the shared resource pool is shared by the terminal devices in at least two types of terminal modes, and the terminal information includes a terminal mode and a terminal type; receiving control information sent by a second terminal device, where the control information indicates that the second terminal device sends data on a first time-frequency resource in a first time period in the shared resource pool; and determining, based on the control information and the terminal information, a terminal mode that is of the second terminal device and that exists when the second terminal device sends data on the first time-frequency resource.

Abstract: Embodiments of this application disclose a data transmission method, including: sending, by a base station, first scheduling information to first UE, where the first scheduling information is used to instruct the first UE to send data to second UE based on the first scheduling information; receiving, by the base station, first feedback information sent by the first UE; and sending, by the base station, second scheduling information to the first UE if the first feedback information indicates that the second UE fails to receive the data. The embodiments of this application further provide a base station, UE, and a data transmission system.

Abstract: Embodiments of this application disclose a data transmission method that includes sending, by a base station, first scheduling information to first UE. The first scheduling information instructs the first UE to send data to second UE based on the first scheduling information. The method includes receiving, by the base station, first feedback information sent by the first UE. The method includes sending, by the base station, second scheduling information to the first UE if the first feedback information indicates that the second UE fails to receive the data. Embodiments of this application further provide a base station, UE, and a data transmission system. In embodiments of this application, the first UE may perceive a data receiving status of the second UE by receiving the first feedback information, so that a corresponding resource can be assigned again for data retransmission.

Abstract: A power control method and a terminal device are disclosed. The method includes: sending, by a first terminal device, first data and first sidelink control information corresponding to the first data to at least one second terminal device; receiving, by the first terminal device, at least one piece of power adjustment information from the at least one second terminal device, where the at least one piece of power adjustment information is determined by the at least one second terminal device based on at least one of the first data and the first sidelink control information; determining, by the first terminal device, a transmit power for second data based on the at least one piece of power adjustment information; and sending, by the first terminal device, the second data to the at least one second terminal device at the transmit power.

Abstract: The present disclosure relates to communication methods and communications apparatus. In one example communication method, a first terminal determines a start time unit of a resource period, and transmits communication data in the resource period, where communication data is transmitted in the start time unit and the communication data is retransmitted in another time unit of the resource period. Then the first terminal sends transmission sequence number indication information and time domain transmission resource indication information to a second terminal that performs direct communication with the first terminal.

Abstract: A synchronization method includes: determining a data signal, where a target sequence in the data signal is mapped to at least one symbol that includes the first symbol within a time unit, data in the data signal is mapped to at least one another symbol in the time unit other than the at least one symbol, the first symbol includes a cyclic prefix, and the target sequence is used by a second device to synchronize the data signal; and sending the data signal to the second device in the time unit. In the present disclosure, a sequence used to synchronize a data signal for each transmission is mapped at an equal spacing to at least one symbol that includes the first symbol within a time unit for the current transmission.

Abstract: This application provides a communication method and a terminal device. The communication method may include determining, by user equipment (UE), a candidate resource set on a first carrier, where the first carrier is a carrier on which a resource is currently to be selected, and the first carrier is used to transmit first data.