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: Embodiments of this application provide a wireless backhaul communication processing method and a related device. In the method, after determining to add a secondary access device for a wireless backhaul device, a first network side device sends capability indication information about the wireless backhaul device to the secondary access device, so that the wireless backhaul device establishes a radio link to the secondary access device.

Abstract: The technology of this application relates to a communication method and apparatus. The method includes receiving first resource configuration information from a target donor node, determining third resource configuration information based on the first resource configuration information and sending the third resource configuration information to a first node. The first resource configuration information includes current resource configuration information of a target cell, the target cell is a cell served by a target parent node, and the target parent node is used by the first node to connect to the target donor node. The third resource configuration information is used for resource configuration of a first cell, and the first cell is a cell served by the first node.

Abstract: This application provides a communication method. In the method, a first node receives a first radio resource control (RRC) reconfiguration message from a first donor node through a second node. After the first node receives the first RRC reconfiguration message from the second node, the first node receives first indication information from the second node. When the first node determines, based on the first indication information, that the first RRC reconfiguration message becomes effective, the first node establishes an RRC connection to a second donor node based on the first RRC reconfiguration message. In the method, the first node and the second node are nodes in a group that performs group handover, the group handover is a cross-donor node group handover, the second node is a head node or the second node is connected to a head node, and the second node is a parent node of the first node.

Abstract: In a communication system, a first central unit (CU) of a first donor node determines a first mapping that comprises a route mapping or a bearer mapping. The route mapping is between the downlink data and a downlink transmission path. The bearer mapping is between the downlink data and a downlink transmission bearer. The downlink transmission path includes a transmission path between the first CU and a target node of the downlink data through a second DU of a second donor node. The downlink transmission bearer includes a RLC channel between the second DU and a next-hop node of the second DU. The first CU then sends the first mapping to a second CU of the second donor node, and sends downlink data to the second DU of the second donor node.

Abstract: Embodiments of this application relates to a communication method and a related device. In an example, a device receives a first data packet in a first network segment, the first data packet comprises a first backhaul adaptation protocol (BAP) routing identity, and the first BAP routing identity is used for transmission of the first data packet in the first network segment. The device further obtains a first correspondence. In response to determining that the first correspondence comprises the first BAP routing identity in the first data packet, the device determines that the first data packet meets a preset condition. In response to that the first data packet meets the preset condition, the device replaces the first BAP routing identity in the first data packet with a second BAP routing identity according to the first correspondence, to obtain a second data packet.

Abstract: A multicast service transmission method includes: a management device that receives a first message; the management device based on the first message, instructs a gateway device to send a data packet of the first multicast service to the terminal device or the access network device, or the management device instructs a gateway device to stop sending a data packet of the first multicast service to the terminal device or the access network device.

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.

Abstract: A key generation method and an apparatus are provided. One example key generation method includes the following steps: determining, by a communication apparatus, that a master base station or a secondary base station serves as an integrated access and backhaul (IAB) donor, wherein the master base station and the secondary base station are connected to an IAB node; and performing at least one of the following when the master base station serves as the IAB donor, generating, by the communication apparatus, an IAB key KIAB based on a master base station key; or when the secondary base station serves as the IAB donor, generating, by the communication apparatus, the IAB key KIAB based on a secondary base station key.

Abstract: A method includes: a first IAB node sets up a first RRC connection to a target IAB donor by performing RLF recovery. The first IAB node sends a first message to a second node by using an SRB 1 or an SRB 2 or the first IAB node sends a BH RLF indication to the second node. t The first IAB node sets up an RRC connection to a target IAB donor by performing RLF recovery and the second node is connected to a source IAB donor through the first IAB node. The second node may be triggered to set up an second RRC connection to the target IAB donor based on the first message or the BH RLF indication.

Abstract: The present disclosure discloses example communication methods and access network device. One example method includes sending, by an access network device, indication information to user equipment, where the indication information indicates a manner of receiving multicast service data, and the manner of receiving multicast service data includes a unicast manner. The multicast service data is sent by the access network device in the unicast manner.

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: In a method, an IAB donor obtains configuration information of a backhaul radio link control channel BH RLC CH, where the configuration information of the BH RLC CH is configuration information of a BH RLC CH between a first integrated access and backhaul IAB node and a source parent node of the first IAB node. Then, the IAB donor sends the configuration information of the BH RLC CH to a target parent node of the first IAB node.

Abstract: Embodiments of this application provide communication method and related devices. In an example method, a first IAB-donor-central unit (CU) determines a quality of service (QoS) attribute corresponding to an F1 application protocol (F1AP) message, where an F1 interface is a communication interface between the first IAB-donor-CU and a distributed unit (DU) of an IAB-node. Then, the first IAB-donor-CU sends the F1AP message and the QoS attribute corresponding to the F1AP message to a second IAB-donor-DU.

Abstract: A method for releasing an F1 connection is used for an IAB node. The method includes: receiving a first message from a source IAB donor node, where the first message indicates that a central unit CU of an IAB donor node connected to the IAB node changes; and releasing an F1 connection to a CU of the source IAB donor node according to the first message. Therefore, the IAB node can release the F1 connection in time based on an indication of the source IAB donor.

Abstract: Embodiments of this application provide a lossless data transmission communication method, apparatus, and system. The method includes: A first network node determines a first data packet. A destination node of the first data packet is a third network node or a security gateway on the third network node side. The third network node is a source donor node or a source donor node central unit (CU) of the first network node. The first network node sends the first data packet to a second network node. The second network node is a target donor node distributed unit DU of the first network node. According to the method, a data packet loss in a topology update process of the first network node can be avoided, and service continuity can be ensured.

Abstract: A communication method and a related device include in response to a first node determining that an RLF occurs on a radio link between the first node and a second node, and there is no other available path between the first node and a destination node, the first node sends first indication information to a third node. The first indication information indicates the RLF or indicates that a link recovery attempt is being made. The second node is a parent node of the first node, and the third node is a child node of the first node; or the second node is a child node of the first node, and the third node is a parent node of the first node, or a donor node connected to the first node.

Abstract: A data transmission method and apparatus. The method is applied to a first integrated access and backhaul (IAB) donor, and includes: receiving a first message from a core network element, where the first message carries an identifier of a first protocol data unit (PDU) session and a first data network name (DNN) associated with the identifier of the first PDU session, and the first DNN indicates a local data network corresponding to a first IAB node; the first IAB node includes a first IAB central unit-user plane (CU-UP), a first IAB-distributed unit (DU), and a first IAB-mobile terminal (MT); and the first IAB CU-UP is connected to the local data network; and notifying the first IAB CU-UP to establish the first PDU session.

Abstract: Embodiments of this application provide a data transmission method and a corresponding apparatus. The method includes obtaining, by a second terminal, first information, wherein the first information indicates a correspondence between a downlink quality of service (QoS) flow and a downlink device-to-device (D2D) bearer; and sending, by the second terminal to a first terminal based on the correspondence, a downlink data packet on the downlink D2D bearer corresponding to the downlink QoS flow, wherein the downlink data packet is carried on the downlink QoS flow.

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.