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 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: Example mapping methods and apparatus are described. One example method includes determining a message type of an uplink signaling message by an integrated access and backhaul node. The integrated access and backhaul node maps the uplink signaling message to a corresponding backhaul radio link control (BH RLC) based on an uplink mapping relationship from an integrated access and backhaul donor centralized unit and the message type. The uplink signaling message is sent to a parent node of the integrated access and backhaul node.

Abstract: This disclosure provides communications methods and apparatuses. One method comprises: receiving, by a first entity of an adaptation layer in a network node, a data packet sent by an entity of a lower protocol layer of the adaptation layer, wherein the data packet comprising an adaptation layer header and an adaptation layer payload; and processing the data packet in response to determining whether the network node is a destination node that the data packet is routed to at the adaptation layer.

Abstract: Examples in this application provide an identifier management method and apparatus. One example method includes receiving, by a first donor node, first indication information sent by a first node, where the first indication information indicates that the first node can be configured to provide a wireless backhaul service, and sending, by the first donor node to the first node, a first identifier, where the first identifier uniquely identifies the first node on a wireless backhaul link within a service range of the first donor node.

Abstract: The present disclosure relates to methods and apparatus for controlling wireless backhaul link. In one example method, a first device determines to manage a first radio link control (RLC) bearer on a wireless backhaul link between a first backhaul node and a second device, where the second device is a parent node of the first backhaul node, the first device is a centralized unit (CU) of a donor base station, and the second device is a distributed unit (DU) of the donor base station; the second device is a second backhaul node, and the first device is a donor base station; or the first device is a CU of a donor base station, and the second device is a second backhaul node. The first device sends a backhaul type indicator and management information of the first RLC bearer to the first backhaul node.

Abstract: A wireless backhaul method, including: a wireless backhaul device generates a first F1AP message, maps the first F1AP message to a signaling-plane bearer of an LTE Uu interface, and sends the first F1AP message to a primary base station of the wireless backhaul device via the signaling-plane bearer of the LTE Uu interface. The primary base station obtains the first F1AP message via the signaling-plane bearer of the LTE Uu interface, encapsulates the first F1AP message into a first X2AP message, and sends the first X2AP message to a secondary base station of the wireless backhaul device. The secondary base station receives the first X2AP message and obtains the first F1AP message based on the first X2AP message.

Abstract: This application provides a communication processing method and apparatus. The method includes: receiving, by a target node, a second message sent by a synchronization source node via at least one intermediate node, where the second message carries a receiving time of a first message from the target node at the synchronization source node and waiting time information of the first message at each of the at least one intermediate node; and determining, by the target node, a clock deviation between the target node and the synchronization source node based on a sending time of the first message at the target node and the second message.

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 data processing method, where a first device communicates with a second device using a relay node, where the relay node does not have a Packet Data Convergence Protocol (PDCP) entity, and the method includes transmitting, by the first device, a first data unit group, where the first data unit group is in a first sequence range, receiving, by the first device, first information using the relay node, where the first information indicates a data unit that the second device has received or has not received in the first data unit group, determining, by the first device, a second sequence range based on the first information.

Abstract: Data transmission methods and apparatuses for wireless backhaul networks are described. A wireless backhaul node determines one or more reporting nodes for a data volume of a first-type data packet from a plurality of next-hop nodes of the wireless backhaul node on an uplink based on the data volume of the first-type data packet, a data volume of a second-type data packet, and a data volume of a third-type data packet. The wireless backhaul node sends, to the one or more reporting nodes, a buffer status report used to indicate the data volume of the first-type data packet. At least one of the first-type data packet, the second-type data packet, and the third-type data packet includes a data packet from an adaptation layer entity of the wireless backhaul node and/or a data packet from a radio link control layer entity of the wireless backhaul node.

Abstract: This application discloses communications methods, systems, and apparatuses. One system comprises: a relay node of a radio access network and a parent node of the relay node; wherein the relay node is configured to: generate a message that comprises an identifier of a radio access network device and downlink status information corresponding to the identifier of the radio access network device, wherein the radio access network device is communicably coupled to the relay node and is directly accessed by a terminal device; and send the message to the parent node.

Abstract: This application provides a flow control method and apparatus, and relates to the field of communications technologies. A relay device indicates flow control to an upper-level node to avoid spectrum resources waste because of excessively small amount of data transmission or an excessively large amount of data transmission from an upper-level node. The method includes: A first node determines to indicate a second node to perform flow control; and the first node sends a first flow control indication to the second node. The first flow control indication is carried in adaptation layer control signaling, an RLC control message, or a MAC CE. The first flow control indication includes identifiers of one or more bearers and flow control information. The second node is a relay node or a donor base station.

Abstract: This application provides a communication method and a communications apparatus. A first entity buffers data, so that a packet loss caused by backhaul link switching or a radio link failure can be avoided as much as possible. The communication method is applied to a relay system. The relay system includes a first node, a source node, and a target node, and the source node provides a service for the first node. The method includes: determining, by the first node, to be handed over from the source node to the target node; and storing, by the first node, data buffered in at least one first entity, where the first entity is a radio link control RLC entity or an adaptation layer entity.

Abstract: A communication method and a related apparatus for data transmission in vehicle-to-everything (V2X) communication, the apparatus including at least one processor and a non-transitory computer-readable memory storing a program to be executed by the at least one processor, the program including instructions for obtaining a first parameter value of an uplink, obtaining a second parameter value of a sidelink, and transmitting, according to a comparison between the first parameter value and the second parameter value, at least one of an uplink media access control protocol data unit or a sidelink media access control protocol data unit, where the uplink is a wireless communications link from the apparatus to a network device, and where the sidelink is a wireless direct transmission link between the apparatus and another terminal device.

Abstract: An IAB node switching method is applied to a relay system, and the relay system includes a donor base station and a first IAB node. The donor base station provides a gateway function for the first IAB node. The first IAB node receives a first BWP configuration from the donor base station, where the first BWP configuration includes a BWP configuration of a second IAB node, and the second IAB node is a candidate upper-level node of the first IAB node. The first IAB node switches to the second IAB node. According to the IAB node switching method, the IAB node, and the donor base station that are provided in this application, service availability of an IAB node is ensured when the IAB node has a plurality of upper-level nodes.

Abstract: This application relates to a method applied to a radio access network. Where the method includes: establishing, by a first node, a first path and a second path between a first node and a second node, where both the first node and the second node are nodes in the radio access network, and the first node is a wireless backhaul node, a donor node, or a distributed unit of the donor node; sending, by the first node, a data packet to the second node through the first path; and when the first node determines that a path change condition is met, changing, by the first node, from the first path to the second path to send the data packet to the second node.

Abstract: This application provides wireless communications configuration methods and apparatuses. One method includes: receiving a routing configuration of a transmission path for a layer of the network device, wherein the routing configuration comprises an identifier of a first wireless backhaul node, the network device is a distributed unit (DU) of the donor node or a second wireless backhaul node connected to the DU, the CU and at least one wireless backhaul node is on the transmission path, and wherein the layer of the network device is capable of mapping, on a backhaul link based on identification information related to quality of service (QoS) requirement comprised in a data packet, the data packet to a radio link control (RLC) channel on a backhaul link for sending the data packet to a next-hop node of the network device on the transmission path; and performing the routing configuration on the layer.

Abstract: This application provides a data processing method and device, to implement bearer mapping of control plane signaling of user equipment on each interface. An IAB system includes a centralized unit CU, a distributed unit DU, a first IAB node, and a second IAB node. The method includes: generating, by the CU, a downlink F1AP message, where a message included in the downlink F1AP message is one or a combination of the following: an F1AP message of a terminal device, an F1AP message of the first IAB node, and an RRC message of the second IAB node; and sending, by the CU, the downlink F1AP message to the DU, and indicating that a message type of the message included in the downlink F1AP message is one of the following: an RRC message type, an F1AP message type, or an RRC message type and an F1AP message type.

Abstract: Embodiments of this application provide a wireless communication method and apparatus. The method includes: receiving, by at least two forwarding nodes, a first data packet from a source node, where the first data packet includes service data, forwarding node set information of the first data packet, and destination node information; and a forwarding node set of the first data packet includes the at least two forwarding nodes, and the destination node information is used to identify a destination node set and/or a destination node; and sending, by at least one forwarding node in the at least two forwarding nodes, a second data packet, where the second data packet includes the service data, forwarding node set information of the second data packet, and the destination node information.