Abstract: This application provides a data transmission method and an apparatus. The method includes that an integrated access and backhaul (IAB) donor distributed unit receives downlink data and service attribute information of downlink data that are sent by an IAB donor centralized unit. The IAB donor distributed unit maps the downlink data to a corresponding backhaul radio link control channel (BH RLC) channel based on the service attribute information of the downlink data or based on the service attribute information of the downlink data and access IAB node address information of the downlink data, and sends the downlink data to a next-hop IAB node.

Abstract: Embodiments of this application provide a communication method and a related device. The method includes: receiving, by a first node, a data packet from a second node, where the data packet includes first indication information, and the first indication information includes a logical channel identity LCID corresponding to the data packet; and delivering, by the first node, the data to an upper protocol layer of the RLC layer of the first node based on the first indication information.

Abstract: This application provides a network selection method, a network device, and a terminal device. The network selection method mainly includes: A first network device sends a first message to a terminal device. The first message includes a message that indicates the terminal device to measure a cell of a first-type network, the first-type network is a high-priority network selectable for the terminal device, and a network provided by the first network device does not belong to the first-type network.

Abstract: An integrated access and backhaul (IAB) node switching method, including: receiving, by a third IAB node, a node switching command from a source donor node, where the node switching command is used to indicate a parent node of the third IAB node to switch to a second node, the source donor node is a control node of the third IAB node, the first node is a source parent node of the third IAB node, the first node is a donor node or another IAB node, and the second node is a donor node or another IAB node; and switching, by the third IAB node, to the second node, and sending, by the third IAB node, first indication information to a child node of the third IAB node, where the first indication information indicates the child node to interrupt transmission with the third IAB node.

Abstract: A method and a device are provided. The method includes: selecting, by user equipment, a random access preamble from a random access preamble set, and selecting a random access channel resource from a random access channel resource set; sending, by the user equipment, the random access preamble by using the random access channel resource; and receiving, by the user equipment, a random access response message on a first downlink bandwidth part; wherein at least one of the random access preamble set or the random access channel resource set corresponds to the first downlink bandwidth part, and the random access channel resource includes at least one of a random access channel time domain resource or a random access channel frequency domain resource.

Abstract: Embodiments of the present invention provide a V2X message sending method, apparatus, and system, and relate to the field of Internet of Vehicles. The method includes: obtaining, by a terminal, first configuration information, where the first configuration information is used for determining a first transmission resource pool; determining the first transmission resource pool based on the first configuration information; selecting a first transmission resource from the first transmission resource pool in a first transmission resource obtaining manner when a preset condition is met; and sending a V2X message by using the first transmission resource.

Abstract: This disclosure provides a data transmission method and apparatus. The method includes: determining a data flow mapped onto a data radio bearer (DRB); and controlling a transmission rate of the data flow based on the transmission rate of the data flow and a first rate threshold of the data flow. This disclosure provides the data transmission method and apparatus, to control the transmission rate of the data flow mapped onto the DRB.

Abstract: A transmission mode selection method and a device are provided. The method includes: determining first indication information, where the first indication information is used to indicate a changed transmission mode and/or indicate to change a transmission mode; and sending the first indication information to a terminal device. There may be a plurality of transmission modes for transmitting a data packet duplicated at a PDCP layer, in other words, there may be a plurality of modes for PDCP duplication. A transmission mode can be selected by using the first indication information. For example, when reliability of a mode for PDCP duplication is not high, another transmission mode can be selected by using the first indication information. In this way, a reliability requirement of a service is met as much as possible, thereby improving transmission quality of the service.

Abstract: This application describes a data transmission method, a terminal device, and a network device. The method may include determining, by a medium access control (MAC) layer of a terminal device, a first MAC control element and a second MAC control element. The method may also include simultaneously transmitting, by the terminal device, the first MAC control element and the second MAC control element on different uplink transmission resources. The data transmission method, the terminal device, and the network device in embodiments of this application help to improve data transmission reliability.

Abstract: Embodiments of this application provide a communication method, apparatus, a terminal, a network device, and a storage medium. After the terminal receives, from the network device, indication information used to indicate the terminal to report traffic pattern information of a first logical channel, a first PDU session, a first application, a first radio bearer, or a first QoS flow, the terminal reports the traffic pattern information of the first logical channel, the first PDU session, the first application, the first radio bearer, or the first QoS flow based on the indication information. In this manner, the terminal reports, based on the indication, the traffic pattern information of only the logical channel, the PDU session, the service, the radio bearer, or the QoS flow that is indicated by the network device.

Abstract: Embodiments of the present invention provide a V2X message sending method, apparatus, and system, and relate to the field of Internet of Vehicles. The method includes: obtaining, by a terminal, first configuration information, where the first configuration information is used for determining a first transmission resource pool; determining the first transmission resource pool based on the first configuration information; selecting a first transmission resource from the first transmission resource pool in a first transmission resource obtaining manner when a preset condition is met; and sending a V2X message by using the first transmission resource.

Abstract: User equipment includes: a receiving module, configured to receive first uplink resource scheduling information sent by a base station, where the first uplink resource scheduling information is used to indicate a first uplink resource allocated to the UE; a processing module, configured to determine whether the first uplink resource can carry an entire BSR of the UE; and a sending module, configured to: the processing module determines that the first uplink resource cannot carry the entire BSR of the UE, send a first part of the entire BSR of the UE to the base station on the first uplink resource, where the first part does not include an entire BSR of the UE.

Abstract: The method may include: after receiving, through a first interface or a second interface, resource allocation information of a neighboring cell of a serving cell in which UE is located, a network device may allocate a resource to the UE based on the resource allocation information of the neighboring cell, so as to prevent the UE from using a same resource as UE located in the neighboring cell, and reduce interference to the neighboring cell; or allocate, to the UE, a resource with relatively small interference to the UE, so as to reduce interference of the neighboring cell to the UE. The first interface is an interface that performs communication by using a UE-to-UE communications technology. The second interface is an interface that performs communication by using a UE-to-network device communications technology.

Abstract: Embodiments of the disclosure provides a BSR communication method and a terminal device. The communication method includes: determining, by a terminal device, a quantity of LCGs currently including to-be-reported buffer data; when determining that only one LCG includes to-be-reported buffer data, determining, by the terminal device, one of a plurality of BSR formats as a first target BSR format, where the plurality of BSR formats are a plurality of formats used by the terminal device to report different BSRs based on different ranges of amount of uplink data in a buffer; and sending, by the terminal device, a target BSR to an access network device using the first target BSR format, where the target BSR is used to indicate an amount of uplink data in a buffer of the LCG.

Abstract: This application provides a communication method and a communications device. The method includes: A first device receives a first message sent by a second device. The first message is used to indicate a bearer configuration of a bearer of the first device and an initial status of the bearer configuration, and the bearer configuration includes a first bearer configuration and/or a second bearer configuration. The first device determines the bearer configuration and the initial status of the bearer configuration based on the first message. According to the technical solutions in embodiments of this application, a bearer configuration of a terminal device and an initial status of the bearer configuration of the terminal can be indicated.

Abstract: A route update method relating to a communications field includes: sending a medium access control protocol data unit (MAC PDU), wherein the MAC PDU comprises a first buffer status report (BSR); and canceling, in response to the sending of the MAC PDU, a scheduling request triggered prior to the MAC PDU assembly. The first BSR comprises a buffer status up to the last event that triggers a BSR prior to the MAC PDU assembly.

Abstract: A communication method and an apparatus are provided. The method includes: receiving, by a terminal device, a first command sent by a network device, wherein the first command carries a first identifier, and is used to activate a first bandwidth part (BWP) indicated by the first identifier, and the first BWP is a BWP on a first component carrier (CC); and ignoring the first command when the terminal device does not support the first BWP and a second BWP being in an active state at the same time, wherein the second BWP is a BWP in the active state on a second CC, and the second CC is different from the first CC. According to the application, the terminal device may determine, based on a capability of the terminal device, to ignore an improper command, to optimize a problem of switching an active BWP in a carrier aggregation scenario.

Abstract: This application provides a communication method, an apparatus, and a communications system, and relates to the field of communications technologies. A terminal device receives system information broadcast by a network device, and determines a bandwidth of an initial BWP based on the system information. The system information includes first indication information. The first indication information indicates that the bandwidth of the initial BWP used for the terminal device is a first bandwidth or a second bandwidth. The first bandwidth is indicated by using a first bandwidth parameter carried in the system information. The second bandwidth is a bandwidth of a CORESET 0. The CORESET 0 is used to schedule the system information.

Abstract: Example data transmission methods and apparatus are described. One example method includes obtaining first configuration information by a terminal device. The first configuration information includes at least one first bearer identifier and path configuration information corresponding to the first bearer identifier, and the path configuration information corresponding to the first bearer identifier includes at least one of a sidelink transmission path or a network device forwarding transmission path. The terminal device obtains first service data and a second bearer identifier corresponding to the first service data, and selects a transmission path for the first service data based on the first bearer identifier, the second bearer identifier, and the path configuration information. The terminal device transmits the first service data on the transmission path.

Abstract: A communication method and an apparatus are provided to improve communications efficiency. The communication method includes: receiving, by a base station, carrier aggregation capability information from UE; receiving, by the base station, carrier information from the UE, where the carrier information indicates a carrier requested by the UE for use, the carrier information includes first information, the first information is used to indicate a type of a service corresponding to at least some of the carrier requested by the UE for use, the carrier requested by the UE for use includes a carrier other than all carriers used by the base station; and sending, by the base station, indication information to the UE based on the carrier aggregation capability information and the carrier information, where the indication information is used to indicate allowing the UE to use one or more of the carrier requested by the UE for use.