Abstract: This application provides a data transmission method, an apparatus, and a system. The method includes: A source network device performs cascading processing on at least two data units to obtain a first data packet, where data included in the at least two data units belongs to a same radio bearer or quality of service flow of a terminal device, and the first data packet is a packet data convergence protocol PDCP layer data packet or a service data adaptation protocol SDAP layer data packet; and sends the first data packet to a target network device through a first tunnel. According to the foregoing method, a plurality of data units are cascaded to obtain one data packet, so that header overheads of the cascaded data packet can be reduced, lossless handover under a cascading function can be implemented, and a cascading gain can be obtained.

Abstract: This application provides a communication method and apparatus. The method is applied to a terminal device, and the method includes: receiving first small data transmission SDT configuration information from a first network device, where the first SDT configuration information corresponds to a first network slice; and sending a radio resource control RRC resume request message and data of the first network slice to the first network device based on the first SDT configuration information. According to this application, a network slice-based SDT solution can be implemented, so that requirements of different users are met.

Abstract: A bandwidth part processing method and apparatus is provided. The method includes: responsive to expiration of an inactivity timer corresponding to an active first bandwidth part BWP, determining whether a carrier in which the first BWP is located includes a second BWP in an active state; and responsive to determining that the carrier includes the second BWP in the active state, deactivating the first BWP. According to this method, an unnecessary BWP switch procedure can be avoided.

Abstract: A communication method for data transmission in the internet of vehicles V2X and a related device. The method includes a first terminal device that receives first information from a first radio access network device, where the first information includes service information of a service of the first terminal device and a resource configuration mode on a sidelink, and there is a correspondence between the service information and the resource configuration mode on the sidelink. The first terminal device transmits, based on the correspondence, data corresponding to the service information on a sidelink transmission resource configured based on the resource configuration mode. The service information may be reliability information.

Abstract: A mobility management method and a communication apparatus are provided. The method includes: A terminal device measures a downlink reference signal of a first cell and a downlink reference signal of a second cell, and reports an obtained first measurement result to an access network device. The access network device sends, based on the first measurement result, at least one piece of beam information to the terminal device. The terminal device performs mobility management based on the at least one piece of beam information. The at least one piece of beam information includes beam information of the first cell and/or the second cell, the first cell is a cell serving the terminal device, the second cell is a cell other than the first cell, and the access network device is an access network device to which the first cell or the second cell belongs.

Abstract: A beam failure recovery BFR method and an apparatus are provided. The method includes: A terminal receives indication information of a first threshold and a second threshold, where the second threshold is used to determine that a beam failure occurs on an access network device. The terminal collects statistics on quantities of beam failure instance times of one or more access network devices that communicate with the terminal based on beams in a cell; and performs beam recovery on an access network device whose quantity of beam failure instance times is greater than or equal to the first threshold and less than the second threshold. The method and the apparatus in this application can further reduce a possibility of the beam failure, improve network reliability, and avoid beam failures on a plurality of devices in the cell at the same time.

Abstract: This application provides a communication method and apparatus. One example method includes receiving, by a central unit of a first network device, a retrieve user equipment (UE) context request from a second network device; sending, by the central unit of the first network device, a context of a terminal device in an inactive state to the second network device; and upon receiving the retrieve UE context request, sending, by the central unit of the first network device, a first message to a distributed unit of the first network device, where the first message indicates the distributed unit of the first network device to release a context of the terminal device.

Abstract: Embodiments of this application provide a communication processing method. A data volume report reported by a terminal device includes a data volume on one of at least two paths in a radio bearer in a duplication mode, so that signaling overheads in a data volume reporting process of the terminal device can be reduced.

Abstract: This application provides communication methods and apparatuses. One method includes: accessing, by a terminal device, an access network device by performing first random access in a radio resource control inactive (RRC inactive) state, and receiving, by the terminal device by using a first receive beam for downlink transmission of the first random access, downlink control information (DCI) transmitted by the access network device.

Abstract: A communication method and apparatus resolves a problem that a resource usage status reported by a network device is inaccurate. The method includes: a first network device receives resource status information from a second network device, where the resource status information includes LBT-related resource information; and the first network device determines a resource usage status of the second network device based on the resource status information. In the foregoing manner, the first network device may determine a resource that is to be released by the second network device, a resource that may be occupied, and the like. In this way, the first network device may perform conversion on the resource usage status of the second network device, to obtain an accurate resource usage status, and in particular, have more accurate estimation on an estimated future resource usage status.

Abstract: Embodiments of this application provide a communication method and apparatus, and a computer storage medium, to reduce communication latency between a terminal and a base station, and improve a capability of adapting to a latency-sensitive scenario. The method provided in this application includes a terminal that receives at least one uplink configuration and at least one random access configuration from a network device. The uplink configuration is used to indicate a parameter for sending uplink data, and the random access configuration is used to indicate a parameter for sending a preamble. The at least one uplink configuration includes a first uplink configuration, the at least one random access configuration includes a first random access configuration, and there is a correspondence between the first uplink configuration and the first random access configuration.

Abstract: A communication method and apparatus. A terminal device determines a priority of a first hybrid automatic repeat request HARQ process. The terminal device determines a target HARQ process from the first HARQ process based on the priority, to transmit data to a network device on a target configured grant by using the target HARQ process. The first HARQ process includes at least one HARQ process corresponding to the target configured grant thereby reducing a latency of transmitting data by using the target HARQ process.

Abstract: A communication method for a terminal device includes receiving a conditional handover (CHO) command from a source network device. The communication method also includes selecting, by the terminal device, a cell in response to a radio link failure (RLF) in a source cell before the terminal device determines a target cell. The target cell is determined according to the CHO command. The communication method additionally includes sending first information to a network device. The first information includes a first parameter. The first parameter is related to a CHO failure caused by the RLF in the source cell.

Abstract: This application provides a resource scheduling method, and a communication apparatus and system. In the method is specifically as follows: The first terminal device sends indication information to the second device, where the indication information includes data volume information of to-be-transmitted data on the sidelink, and the data volume information of the to-be-transmitted data is used by the second device to obtain a target resource, and the target resource may be used by the second device to forward, to the third communication device, data received from the sidelink. By using this application, the second device may obtain a required resource based on the data volume information of the to-be-transmitted data in the indication information sent by the first terminal device, and forward, by using the required resource, the data received by the second device from the sidelink, to reduce a relay forwarding delay in sidelink communication.

Abstract: This application discloses a communication method and apparatus. The method includes: A first access network device receives first uplink data from a terminal device; and sends a request message to a core network device, where the request message requests path switching of user plane data of the terminal device, the request message includes first information, and the first information indicates a first PDU session corresponding to the first uplink data.

Abstract: Embodiments of this application provide a wireless communication method, a terminal, and a network device. In the embodiments of this application, an operation on a wideband that includes a plurality of bandwidth parts can be supported.

Abstract: A target network device of a terminal device receives N data packets of a first service and auxiliary information from a source network device, where the auxiliary information indicates a transmission status of at least one data packet before the N data packets; and the target network device determines the transmission status of the at least one data packet.

Abstract: Embodiments of this application provide a HARQ process-based data transmission method and a terminal, and relate to communication technologies, to determine an initial status of a HARQ process and further perform uplink transmission by using a HARQ process that is in a not pending status. A specific solution includes: A terminal sets one or more HARQ processes that are associated with a first configured grant CG configuration on a first bandwidth part BWP to be in a not pending status, where the first CG configuration includes one or more CG configurations configured by a network device for the terminal on the first BWP, and the first BWP is a currently activated BWP of the terminal; and the terminal sends uplink data to the network device by using the HARQ process that is associated with the first CG configuration and that is in the not pending status.

Abstract: A minimization of drive tests (MDT) method and apparatus includes: a network device sends MDT configuration information to a terminal, where the MDT configuration information includes an MDT measurement parameter of a shared spectrum; and the terminal performs MDT on the shared spectrum based on the MDT configuration information to obtain a measurement report, and sends the measurement report to the network device. The MDT may be performed on a shared spectrum to obtain a measurement report. The measurement report may better reflect an application status of the shared spectrum, to help optimize a network device that performs communication by using the shared spectrum.

Abstract: Embodiments of this application provide example communication methods and apparatuses. One example method includes receiving, by a first network device, a first request message and uplink data from a terminal, where the first request message is for requesting to resume a suspended radio resource control (RRC) connection. The first network device can then send a second request message to a second network device based on the first request message and the uplink data, where the second network device is a network device previously serving the terminal, and the second request message includes information about the uplink data, where the second request message is for requesting the second network device to release a first data channel between the second network device and a core network device, or the second request message is for requesting the second network device to send a context of the terminal to the first network device.