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: A method and system for including a base station that configures a first user equipment (UE) that is in a radio resource control connected state with the base station. The UE is configured to be a synchronization source and transmit a first device-to-device synchronization signal (D2DSS) by using a synchronization resource that comprises a time resource, a frequency resource or a time and frequency resource. The base station instructs the first UE to transmit the first D2DSS using the synchronization resource. The base station signals the UE to configure the UE separately from the signal to transmit the D2DSS, and both of the signals are performed with radio resource control signaling from the base station to the UE.

Abstract: Embodiments provide a data exchange method, a terminal device, and a network device. In accordance with the disclosure, a terminal device can obtain resource information for communicating with another terminal device. The resource information can indicate a time-frequency resource and an antenna port corresponding to an antenna polarization direction. The terminal device can then send scheduling information and data information to the another terminal device using the time-frequency resource and the antenna polarization direction. Time-frequency resources and/or antenna polarization directions used by any two terminal devices to send scheduling information and data information to other terminal devices can be different. In this way, terminal devices using different transmit antenna ports can use a same time-frequency resource, and an optional dimension of resource information is increased, thereby increasing an overall system communication capacity.

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: This application discloses a method and an apparatus for determining a data feedback resource. The method includes receiving, by a first terminal, first data sent by a second terminal. The method includes determining a feedback resource of the first data. The feedback resource of the first data is a feedback resource in a feedback resource pool. The method includes sending feedback information of the first data to the second terminal on the feedback resource. The feedback information indicates a receiving status of the first data.

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. In the 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, thereby improving reliability of data transmission between the two UEs.

Abstract: Embodiments of this application provide a feedback method and user equipment. The method includes: determining, by a first user equipment, a feedback resource based on a physical resource occupied by data sent by a second user equipment and/or identification information of the second user equipment, where the feedback resource is a resource determined by the first user equipment after receiving the data sent by the second user equipment; and sending, by the first user equipment, feedback information to the second user equipment on the feedback resource, where the feedback information is used to feed back a result of receiving the data by the first user equipment. This application can improve reliability of sidelink communication.

Abstract: A data packet transmission method and a terminal, the method including determining, by a terminal, a transmission resource utilization threshold, where the transmission resource utilization threshold indicates maximum transmission resource utilization for transmitting a to-be-transmitted data packet by using a transmission resource in a resource pool in a preset time period, and the transmission resource utilization threshold is determined by resource utilization of the transmission resource in the resource pool, selecting, by the terminal, a target transmission resource in a first time period from the resource pool based on the transmission resource utilization threshold, and sending, by the terminal, the to-be-transmitted data packet on the target transmission resource.

Abstract: A data sending method, a terminal device, an access network device, and a system are provided. The method includes: obtaining, by a terminal device, a sending period of first data; obtaining, by the terminal device, configuration information of a first resource; determining, a second resource based on the configuration information of the first resource and a sending period of the first data; and selecting, by the terminal device, a resource other than the second resource to send the first data. When selecting a resource used for V2X communications data or D2D communications data, the terminal device excludes the second resource that cannot be used for the V2X communications data or the D2D communications data, so as to avoid a conflict between the second resource and the resource selected by the terminal device for sending the first data, and improve reliability and security of D2D communication and V2X communication.

Abstract: Embodiments of the present invention provide a device and a method for data transmission in D2D communication. The method includes: transmitting, by transmitting user equipment UE, scheduling signaling to receiving UE, where the scheduling signaling includes frequency domain resource information, a quantity of cycles that can be occupied, or transmission pattern information; and transmitting, by the transmitting UE, user data to the receiving UE according to the scheduling signaling, so that the receiving UE receives the user data according to the scheduling signaling. In the technical solution of the present invention, if there is no feedback from the receiving UE in a D2D communication process, the transmitting UE may repeatedly transmit the user data, and the receiving UE may repeatedly receive the user data, thereby improving reliability of data transmission.

Abstract: Embodiments of the present invention disclose a method and an apparatus for transmitting a synchronization signal. The method of the present invention includes: determining, by a first terminal, a D2D type, where the D2D type includes D2D discovery and D2D communication; and transmitting, by the first terminal, a synchronization signal according to the determined D2D type. Therefore, synchronization signals transmitted by terminals of different D2D types do not affect each other, avoiding that a second terminal detects and receives a synchronization signal that does not correspond to a D2D type of the second terminal and ensuring that user direct-connection communication can be performed correctly and efficiently.

Abstract: A method includes: transmitting, by a transmitting user equipment (UE), scheduling signaling to a receiving UE, where the scheduling signaling includes frequency domain resource information, a quantity of cycles that can be occupied, or transmission pattern information. The method further includes transmitting, by the transmitting UE, user data to the receiving UE according to the scheduling signaling, so that the receiving UE receives the user data according to the scheduling signaling.

Abstract: Embodiments of the present invention provide a method for releasing a semi-persistent scheduling resource and a device. The method can be used in V2X communication. The method may include receiving, by a base station, service information sent by user equipment UE. The service information may include first service information of first service data. The method may further include determining, by the base station based on the first service information, semi-persistent scheduling SPS information corresponding to the first service data; and sending, by the base station, downlink control information DCI to the UE. The DCI may include the SPS information, and may be used to instruct the UE to activate the new SPS resource and release a target SPS resource. The target SPS resource may include an SPS resource corresponding to second service data that has been transmitted. This can reduce signaling overheads of the DCI.

Abstract: Embodiments of the present invention provide a resource configuration method and an apparatus. User equipment includes a receiving module and a processing module, where the receiving module is configured to receive a broadcast message sent by a control node and including at least one first resource pool, where the control node is a base station serving the UE or a group head UE of a group to which the UE belongs; and the processing module is configured to receive a device to device D2D service or send a D2D service by using a resource in the at least one first resource pool.

Abstract: Embodiments provide user equipment includes a processor and a transmitter. The processor determines a time domain resource within a T2 time length based on second time domain resource indication information, where the second time domain resource indication information indicates a time domain resource occupied for data transmission within a T1 time length, and T2 is twice of T1. The processor further generates second control information, where the second control information includes the second time domain resource indication information. The transmitter sends the second control information. The transmitter further sends data on the time domain resource that is determined within the T2 time length. In this way, only a time domain pattern with a half time length of a period is defined, so that total time domain patterns in a system are applicable to a vehicle-to-vehicle communication scenario. In addition, time domain resource indication information occupies fewer bits, thereby saving system resources.

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: The present disclosure discloses a method and user equipment for sending a preamble sequence. The method includes determining a transmit power for sending a preamble sequence, and sending the preamble sequence according to the determined transmit power.

Abstract: Embodiments of the present invention disclose a trigger method and related apparatus. The embodiments of the present invention include: determining time-frequency resource configuration information of a physical trigger channel PTCH; detecting one PTCH on a time-frequency resource occupied by the one PTCH indicated by the time-frequency resource configuration information of the PTCH; determining whether triggering exists according to a PTCH detection result, where the triggering is used to indicate that first information needs to be transmitted in a first information subframe or a first information opportunity associated with the PTCH; and transmitting the first information in the first information subframe or the first information opportunity associated with the PTCH if it is determined that the triggering exists.

Abstract: Embodiments of the present invention provide a resource configuration method and an apparatus. User equipment (UE) includes a receiving module and a processing module, where the receiving module is configured to receive a broadcast message sent by a control node and including at least one first resource pool, where the control node is a base station serving the UE or a group head UE of a group to which the UE belongs. The processing module is configured to receive a device to device (D2D) service or send a D2D service by using a resource in the at least one first resource pool.

Abstract: A method for sending a preamble sequence and user equipment. The method includes determining a transmit power for sending a preamble sequence, where the transmit power meets a formula that takes into account a maximum transmit power of user equipment, a downlink power loss, and a target receive power of the preamble sequence. The method also includes sending the preamble sequence according to the determined transmit power.