Abstract: Embodiments of this application provide a node handover method, in which a source donor node sends a handover request message to a target donor node, where the handover request message includes context information of an IAB node and context information of at least one terminal device. The source donor node receives a handover response message sent by the target donor node, where the handover response message includes an identifier of an accepted terminal device in the at least one terminal device and/or an identifier of a rejected terminal device in the at least one terminal device.

Abstract: A first node sends, after determining that all data packets from a migrating IAB node are received, first indication information to a source IAB donor CU. The first node is an upstream IAB node of a source parent node of the migrating IAB node or is a source IAB donor DU, the source IAB donor CU is an IAB donor CU connected to the migrating IAB node before migration, and the source IAB donor DU is an IAB donor DU connected to the migrating IAB node before the migration. The first node receives second indication information from the source IAB donor CU. The first node updates or releases, based on the second indication information, backhaul configuration information that corresponds to the migrating IAB node and that is on a backhaul link between the first node and a child node of the first node.

Abstract: An integrated access and backhaul (IAB) node configuration method includes receiving, by a target IAB donor, first information from a source IAB donor. The method also includes sending, by the target IAB donor, first configuration information to the source IAB donor. The first configuration information is for handing over an IAB node from the source IAB donor to the target IAB donor. The IAB node includes a mobile terminal (MT) function and a distributed unit (DU) function. The first configuration information is based on the first information. The first configuration information indicates a transmission direction of a time domain resource configured by the target IAB donor for the MT function. The first information indicates one or more different types of information.

Abstract: This application provides a communication method. The method includes: When a radio link failure RLF occurs on a first communication device connected to a first donor network device, the first communication device performs an RLF recovery process, and connects to a second donor network device. The first communication device determines that the first donor network device and the second donor network device are different network devices. The first communication device sends first information to a second communication device, where the first information indicates the second communication device to send a radio resource control RRC re-establishment request message, or indicates the second communication device to obtain system information sent by the first communication 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: Embodiments of this application disclose a logical channel (LCH) configuration method. In the method, a first data radio bearer (DRB) of a terminal corresponds to a first LCH, and the first LCH is for transmitting packet data convergence protocol (PDCP) data corresponding to a source donor node. The method includes: A first relay node generates configuration information of a second LCH corresponding to the first DRB, where the second LCH is for transmitting PDCP data corresponding to a target donor node; and the first relay node sends the configuration information of the second LCH to the terminal. The source donor node and the target donor node are respectively a source donor node and a target donor node during first relay node handover or second relay node handover. A second relay node is a relay node on a link between the first relay node and the source donor 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: A communication method applied to an integrated access and backhaul (IAB) system includes: a child node receives a first radio resource control (RRC) reconfiguration message from an access network device via a parent node, where the first RRC reconfiguration message includes a random access-free indication. The child node starts a timer. The child node sends a first RRC reconfiguration complete message to the access network device via the parent node. The child node receives first indication information from the parent node, where the first indication information indicates to stop the timer. The child node stops the timer.

Abstract: This application discloses communications methods, apparatuses, and systems. In one implementation, a method includes: performing a function of a control-plane protocol layer, wherein the control-plane protocol layer comprises a first protocol layer of the network node corresponding to a first protocol layer of a relay node, the first protocol layer is on an interface between the network node and the relay node, and the network node is a donor base station or a centralized unit of a donor base station; and sending, from the first protocol layer of the network node, a first message to the first protocol layer of the relay node, wherein the first protocol layer of the network node and the first protocol layer of the relay node are F1 application protocol layers, and the first message is a F1AP message that comprises one or more of context management information of a terminal device served by the relay node or a radio resource control message of the terminal device.

Abstract: A communication apparatus includes a processor coupled to a memory. The memory is configured to store non-transitory instructions. The processor is configured to execute the non-transitory instructions to thereby cause the communication apparatus to perform operations including sending first information to a target integrated access and backhaul (IAB) donor of an IAB node, and receiving second information from the target IAB donor. The first information includes request information useable for setting up a first F1 interface. The second information includes feedback information of the request information. The first F1 interface is a communication interface between a distributed unit (DU) of the IAB node and a central unit (CU) of the target IAB donor. The communication apparatus is a source IAB donor of the IAB node or included in a IAB donor.

Abstract: This application relates to the field of communication technologies, and provides a communication method, apparatus, and system. In the method, a source donor node receives a measurement report from an IAB node through a source parent node, and determines, based on the measurement report, to hand over the IAB node from the source parent node to a target parent node. The source donor node sends configuration information to the IAB node through the source parent node. In a process in which the IAB node is handed over from the source parent node to the target parent node, the IAB node sends uplink data to a target donor node by using the configuration information through the target parent node. The configuration information includes: a routing configuration and/or a bearer mapping configuration. The uplink data includes uplink user plane data and/or uplink control plane data.

Abstract: Embodiments of this disclosure provide a communication method, and an associated communication apparatus, medium, and chip. In a communication method, a target access network device receives first information, where the first information indicates a relationship between a first network slice in a first network and a second network slice in a second network, and the first network is different from the second network. The target access network device performs access control from a terminal device to the target access network device based on at least the first information. In this manner, in embodiments of this disclosure, the target access network device can perform access control on the terminal device during cross-network access, to reduce an access latency, reduce a service interruption problem caused by session rejection of the terminal device, and ensure service continuity of the terminal device.

Abstract: Embodiments of this application provide a communication method and a related device. In the method, a network management device receives first information from an integrated access and backhaul (IAB) node and generates first configuration information based on the first information, and sends the first configuration information to the IAB node.

Abstract: This application provides a communication method and an apparatus. UE establishes a connection to a home access gateway by using CPE, the home access gateway sends configuration information of a first link and configuration information of a second link to the CPE, and sends the configuration information of the second link to the UE. The first link is a link between the CPE and the home access gateway, the second link is a link between the CPE and the UE, the configuration information of the first link is used to indicate quality of service QoS information of the first link, and the configuration information of the second link is used to indicate QoS information of the second link. The UE and the CPE ensure, based on respective configuration information, QoS of UE service data transmitted on the first link and the second link.

Abstract: A flow control method and an apparatus, the method including receiving, by a first integrated access and backhaul (IAB) node, a radio link failure (RLF) notification from a second IAB node, where the first IAB node is a child node of the second IAB node and the second IAB node is a parent node of the first IAB node, and rerouting, by the first IAB node, based on the RLF notification, uplink data that corresponds to N backhaul adaptation protocol (BAP) routing identifiers, where N is an integer greater than or equal to 1.

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: This application provides a communication method and an apparatus. UE establishes a connection to a home access gateway by using CPE, the home access gateway sends configuration information of a first link and configuration information of a second link to the CPE, and sends the configuration information of the second link to the UE. The first link is a link between the CPE and the home access gateway, the second link is a link between the CPE and the UE, the configuration information of the first link is used to indicate quality of service QoS information of the first link, and the configuration information of the second link is used to indicate QoS information of the second link. The UE and the CPE ensure, based on respective configuration information, QoS of UE service data transmitted on the first link and the second link.

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: A communication method includes a first IAB node receives a first message from a CU of an IAB donor, where the first message indicates the first IAB node to be handed over from a first parent node to a second parent node, and the first message includes a first IP address of the first IAB node. The first IAB node determines first transport network layer association information between the first IAB node and the CU of the IAB donor based on the first IP address. The first IAB node updates control plane context information of an F1 interface by using the first transport network layer association information, where the F1 interface is an interface between the first IAB node and CU of the IAB donor. An IAB node communicates with a CU of an IAB donor by using a first IP address as soon as possible after handover is completed.

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.