Communication method and device

Abstract

The invention discloses a communication method and a communication device, relates to the technical field of communication, and can enable an F1 switching donor (Donor-CU1) to transmit data with an IAB through a topology under dual-connected donor-cu (such as Donor-C2 (MN) and Donor-C3 (SN)) of the MT under the condition that a DU and an MT of the IAB are connected with different donor-cu. The method comprises the following steps: a Donor-C2 node or a Donor-C3 node or an IAB node sends a first message; the Donor-CU1 receives a first message. The first message indicates that the IAB-MT is connected with the Donor-C2 and the Donor-C3. The Donor2 is a main station of the IAB-MT, and the Donor3 is an auxiliary station of the IAB-MT. And the Donor-CU1 is connected with the IAB-DU, or the Donor-CU1 is about to be connected with the IAB-DU. And the Donor-CU1 communicates with the IAB node through the topology under the Donor-CU2 and / or the topology under the Donor-CU3. And under the condition that the Donor-C1 is about to be connected with the IAB-DU, a Donor-C4 is further included, and the Donor-C4 is connected with the IAB-DU. The Donor-C4 may also send a first message to the Donor-C1.

Description

Technical Field

[0001] This application relates to the field of communication technologies, and in particular, to a communication method and apparatus. Background Art

[0002] In an integrated access and backhaul (IAB) network, an IAB node is connected to an IAB host. The IAB node can provide wireless access services for a user equipment (UE), and the service data of the UE is sent by the IAB node to the IAB host through a wireless backhaul link.

[0003] In some scenarios, the mobile terminal (MT) and the distributed unit (DU) in the IAB node are connected to different IAB hosts. In this scenario, for the topological communication between the host connected to the DU of the IAB node and the host connected to the MT of the IAB node through the MT of the IAB node, how to construct more links in this topology so that the host connected to the DU of the IAB node and the DU of the IAB node can communicate through multiple links to improve capacity and robustness is a problem to be solved. Summary of the Invention

[0004] This application provides a communication method and apparatus, which can enable an IAB node and an IAB host to have multiple communication paths in a scenario where the MT and DU of the IAB node are connected to different IAB hosts.

[0005] To achieve the above object, the embodiments of this application provide the following technical solutions:

[0006] In a first aspect, a communication method is provided. The communication method can be applied to an IAB node, Donor-CU2, Donor-CU3, Donor-CU4, or their apparatuses and modules. The method includes: sending a first message, where the first message indicates that the mobile terminal IAB-MT of the integrated access and backhaul node is connected to the centralized unit Donor-CU2 of the second host node and the centralized unit Donor-CU3 of the third host node; the second host node is the primary station of the IAB-MT, and the third host node is the secondary station of the IAB-MT; Donor-CU1 is connected to the distributed unit IAB-DU of the integrated access and backhaul node, or Donor-CU1 is about to be connected to the IAB-DU; where Donor-CU1 communicates with the IAB node through the topology under Donor-CU2 and / or the topology under Donor-CU3.

[0007] In this solution, the IAB node, Donor-CU2, Donor-CU3, Donor-CU4 or their devices / modules send a first message, and Donor-CU1 can receive the first message, enabling Donor-CU1 to determine that there are connections between the IAB and Donor-CU2 and Donor-CU3, so that Donor-CU1 can communicate with the IAB using the topologies under Donor-CU2 and Donor-CU3.

[0008] Combined with the first aspect, in a possible design, before sending the first message, it further includes: generating the first message.

[0009] Combined with the first aspect, in a possible design, it further includes: receiving second indication information, where the second indication information indicates whether Donor-CU3 allocates a default configuration to the IAB-MT.

[0010] Combined with the first aspect, in a possible design, it further includes: sending second indication information, where the second indication information indicates whether Donor-CU3 allocates a default configuration to the IAB-MT.

[0011] Through this solution, after receiving the second indication information, if it indicates that Donor-CU3 allocates a default configuration to the IAB-MT, then Donor-CU3 can allocate a default configuration to the IAB-MT, enabling the IAB-MT to also receive the default configuration when the F1 terminating donor is not the primary or secondary station to which the IAB-MT is connected. If it indicates that Donor-CU3 does not allocate a default configuration to the IAB-MT, then Donor-CU3 can refrain from allocating a default configuration to the IAB-MT.

[0012] Combined with the first aspect, in a possible design, it further includes: sending fourth indication information, where the fourth indication information indicates that Donor-CU2 allocates a default configuration to the IAB-MT or Donor-CU2 causes Donor-CU3 to allocate a default configuration to the IAB-MT.

[0013] Combined with the first aspect, in a possible design, it further includes: receiving fourth indication information, where the fourth indication information indicates that Donor-CU2 allocates a default configuration to the IAB-MT or Donor-CU2 causes Donor-CU3 to allocate a default configuration to the IAB-MT.

[0014] Through this solution, Donor-CU2 can allocate the default configuration to the IAB-MT or let Donor-CU3 allocate the default configuration to the IAB-MT, so that the IAB-MT can also receive the default configuration when the F1 terminating donor is not the primary or secondary station of the IAB-MT connection.

[0015] In combination with the first aspect, in a possible design, the method further includes: sending first indication information to the IAB node or Donor-CU1, where the first indication information includes one or more of the following: the identifier of Donor-CU3, the IAB node identifier allocated by Donor-CU3 to the IAB node, the identifier of Donor-CU2, the IAB node identifier allocated by Donor-CU2 to the IAB node, the indication information that Donor-CU2 is the primary station, the indication information that Donor-CU3 is the secondary station, the indication information on whether there is a default backhaul link default configuration under Donor-CU2 or Donor-CU3, the primary cell identifier Pcell ID, and the primary and secondary cell identifier Pscell ID.

[0016] Through this solution, Donor-CU1 can determine that the IAB is connected to Donor-CU2 and Donor-CU3 through the first indication information.

[0017] In combination with the first aspect, in a possible design, the first message includes the first indication information.

[0018] In combination with the first aspect, in a possible design, the method further includes: sending third indication information indicating that an F1 connection exists or will be established between the IAB node and Donor-CU1.

[0019] In combination with the first aspect, in a possible design, the method further includes: receiving third indication information indicating that an F1 connection exists or will be established between the IAB node and Donor-CU1.

[0020] In combination with the first aspect, in a possible design, the third indication information includes the identifier of Donor-CU1.

[0021] Through the above solution, Donor-CU3 can obtain the identifier of Donor-CU1 by receiving the third indication information, so that Donor-CU3 can send the first indication information or send the first message to Donor-CU1 through the identifier of Donor-CU1.

[0022] In combination with the first aspect, in a possible design, sending the first message includes: after the IAB-MT successfully connects to Donor-CU2 and Donor-CU3, the first sending node sends the first message; or, when it is determined that the IAB-MT establishes a connection with Donor-CU2 and Donor-CU3, the first message is sent.

[0023] In combination with the first aspect, in a possible design, sending the first message includes: after the IAB-MT successfully accesses the cell under Donor-CU3, the IAB node sends the first message; or, sending the first message includes: after Donor-CU2 sends a secondary station addition request message, or after Donor-CU2 receives a secondary station addition request confirmation message, Donor-CU2 sends the first message; or, sending the first message includes: after Donor-CU3 receives a secondary station addition request message, or after Donor-CU3 sends a secondary station addition request confirmation message, Donor-CU3 sends the first message.

[0024] In combination with the first aspect, in a possible design, the method further includes: Donor-CU2 and / or Donor-CU3 receive an interface message from Donor-CU1, and the control plane information of the F1 interface between Donor-CU1 and the IAB-DU is carried in the interface message. Through this solution, the control plane information of the F1 interface between Donor-CU1 and the IAB-DU can be sent through the interface message, thereby increasing the transmission path of the control plane information of the F1 interface.

[0025] In combination with the first aspect, in a possible design, Donor-CU4 is connected to the IAB-DU, and Donor-CU1 is about to be connected to the IAB-DU.

[0026] In a second aspect, a communication method is provided. The first host node centralized unit Donor-CU1 receives a first message, and the first message indicates that the integrated access and backhaul node mobile terminal IAB-MT is connected to the second host node centralized unit Donor-CU2 and the third host node centralized unit Donor-CU3; the second host node is the master station of the IAB-MT, and the third host node is the secondary station of the IAB-MT; Donor-CU1 is connected to the integrated access and backhaul node distributed unit IAB-DU, or Donor-CU1 is about to be connected to the IAB-DU; Donor-CU1 communicates with the IAB node through the topology under Donor-CU2 and / or the topology under Donor-CU3.

[0027] In this solution, Donor-CU1 receives a first message, enabling Donor-CU1 to determine that there are connections between the IAB and Donor-CU2 and Donor-CU3, so that the topologies under Donor-CU2 and Donor-CU3 can be used to communicate with the IAB.

[0028] Combined with the second aspect, in a possible design, it further includes: receiving first indication information, where the first indication information includes one or more of the following: the identifier of Donor-CU3, the IAB node identifier assigned by Donor-CU3 to the IAB node, the identifier of Donor-CU2, the IAB node identifier assigned by Donor-CU2 to the IAB node, the indication information that Donor-CU2 is the master station, the indication information that Donor-CU3 is the slave station, the indication information on whether there is a default backhaul link default configured under Donor-CU2 or Donor-CU3, the primary cell identifier Pcell ID, and the primary and secondary cell identifier Pscell ID.

[0029] In this solution, Donor-CU1 can determine that there are connections between the IAB and Donor-CU2 and Donor-CU3 through the first indication information.

[0030] Combined with the second aspect, in a possible design, the first message includes the first indication information.

[0031] Combined with the second aspect, in a possible design, it further includes: Donor-CU1 sending an interface message to Donor-CU2 and / or Donor-CU3, where the control plane information of the F1 interface between Donor-CU1 and the IAB-DU is carried in the interface message.

[0032] Through this solution, the control plane information of the F1 interface between Donor-CU1 and the IAB-DU can be sent through the interface message, thereby increasing the transmission path of the control plane information of the F1 interface.

[0033] Combined with the second aspect, in a possible design, Donor-CU1 receiving the first message includes: after the IAB-MT is successfully connected to Donor-CU2 and Donor-CU3, or when it is determined that a connection is established between the IAB-MT and Donor-CU2 and Donor-CU3, Donor-CU1 receives the first message.

[0034] When the IAB-MT has or is about to establish a dual connection, Donor-CU1 receives the first message, enabling Donor-CU1 to communicate with the IAB using the topologies under Donor-CU2 and Donor-CU3.

[0035] In a third aspect, a communication method is provided, including: a second host node centralized unit Donor-CU2, or a third host node centralized unit Donor-CU3, or an integrated access and backhaul IAB node sends a first message, the first message indicating that an integrated access and backhaul node mobile terminal IAB-MT is connected to Donor-CU2 and Donor-CU3; the second host node is the master station of the IAB-MT, and the third host node is the secondary station of the IAB-MT; a first host node centralized unit Donor-CU1 is connected to an integrated access and backhaul node distributed unit IAB-DU; or, Donor-CU2, or Donor-CU3, or an IAB node, or a fourth host node centralized unit Donor-CU4 sends a first message, the first message indicating that the IAB-MT is connected to Donor-CU2 and Donor-CU3; the second host node is the master station of the IAB-MT, and the third host node is the secondary station of the IAB-MT; Donor-CU4 is connected to the IAB-DU, and Donor-CU1 is about to be connected to the IAB-DU; Donor-CU1 receives the first message; Donor-CU1 communicates with the IAB node through the topology under Donor-CU2 and / or the topology under Donor-CU3.

[0036] In a fourth aspect, a communication system is provided, including: a first host node centralized unit Donor-CU1, a second host node centralized unit Donor-CU2, a third host node centralized unit Donor-CU3, an integrated access and backhaul IAB node; Donor-CU1 is configured to receive a first message, the first message indicating that an integrated access and backhaul node mobile terminal IAB-MT is connected to Donor-CU2 and Donor-CU3; the second host node is the master station of the IAB-MT, and the third host node is the secondary station of the IAB-MT; Donor-CU2 or Donor-CU3 or the IAB node is configured to send the first message; Donor-CU1 is further configured to communicate with the IAB node through the topology under Donor-CU2 and / or the topology under Donor-CU3.

[0037] In combination with the fourth aspect, in a possible design, it further includes: a fourth host node centralized unit Donor-CU4, in the case where Donor-CU1 is about to be connected to the IAB-DU, Donor-CU4 is connected to the IAB-DU; Donor-CU2 or Donor-CU3 or the IAB node or Donor-CU4 is configured to send the first message.

[0038] Fifth aspect, a communication device is provided. The communication device is used to implement the various communication methods described above. The communication device includes corresponding modules, units, or means for implementing the above communication methods. The modules, units, or means can be implemented by hardware, software, or by hardware executing corresponding software. The hardware or software includes one or more modules or units corresponding to the above functions.

[0039] Sixth aspect, a communication device is provided. The communication device includes: a processor and a memory; the memory is used to store computer instructions, and when the processor executes the instructions, the communication device is enabled to execute the communication method of any aspect in the above.

[0040] Seventh aspect, a communication device is provided, including: a processor. The processor is coupled to the memory, and the processor is used to read and execute instructions in the memory, so that the communication device executes the communication method of any aspect in the above.

[0041] Eighth aspect, a chip system is provided. The chip system includes a processor and input / output ports. The processor is used to implement the processing functions involved in the communication method of any aspect in the above, and the input / output ports are used to implement the transceiver functions involved in the communication method of any aspect in the above.

[0042] In a possible design, the chip system further includes a memory, and the memory is used to store program instructions and data for implementing the functions involved in the communication method of any aspect in the above.

[0043] The chip system can be composed of chips or can include chips and other discrete devices.

[0044] Ninth aspect, a computer-readable storage medium is provided. Instructions are stored in the computer-readable storage medium; when the instructions run on a communication device, the communication device is enabled to execute the communication method of any design in the above.

[0045] Tenth aspect, a computer program product is provided. The computer program product includes a computer program or instructions, and when the computer program or instructions run on a computer, the computer is enabled to execute the communication method of any design in the above.

[0046] It can be understood that the beneficial effects that can be achieved by the methods, chip systems, communication systems, communication devices, computer-readable storage media, and computer program products provided in the above second aspect to tenth aspect can refer to the beneficial effects in the above first aspect and any possible implementation manner, and will not be elaborated here. Description of the Drawings

[0047] Figure 1 Schematic diagram of a structure of an IAB network provided by an embodiment of the present application;

[0048] Figure 2 Schematic diagram of an interface between an IAB node and an IAB host provided by an embodiment of the present application;

[0049] Figure 3 Schematic diagram of a control plane protocol stack in an IAB network provided by an embodiment of the present application;

[0050] Figure 4 Schematic diagram of a user plane protocol stack in an IAB network provided by an embodiment of the present application;

[0051] Figure 5 Schematic diagram of dual connection of an IAB node provided by an embodiment of the present application;

[0052] Figure 6 Schematic diagram of different CUs connected by the MT and DU of an IAB node provided by an embodiment of the present application;

[0053] Figure 7 Schematic diagram of a structure of a communication system provided by an embodiment of the present application;

[0054] Figure 8 Schematic diagram of a process of a communication method provided by an embodiment of the present application;

[0055] Figure 9 Schematic diagram of a process of another communication method provided by an embodiment of the present application;

[0056] Figure 10 Schematic diagram of a process of another communication method provided by an embodiment of the present application;

[0057] Figure 11 Schematic diagram of a process of another communication method provided by an embodiment of the present application;

[0058] Figure 12 Schematic diagram of a process of another communication method provided by an embodiment of the present application;

[0059] Figure 13 Schematic diagram of a communication device provided by an embodiment of the present application;

[0060] Figure 14 Schematic diagram of another communication device provided by an embodiment of the present application. Detailed implementation manners

[0061] In the description of this application, unless otherwise specified, " / " means that the objects associated before and after are in an "or" relationship. For example, A / B may represent A or B. The "and / or" in this application is merely a relationship describing the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. Here, A and B can be singular or plural.

[0062] In the description of this application, unless otherwise specified, "a plurality of" means two or more than two. "At least one (item)" or its similar expressions refer to any combination of these items, including any combination of single item (s) or plural items (s). For example, at least one (item) of a, b, or c can represent: a, b, c, a - b, a - c, b - c, or a - b - c, where a, b, c can be single or plural.

[0063] In addition, for the convenience of clearly describing the technical solutions of the embodiments of this application, in the embodiments of this application, terms such as "first" and "second" are used to distinguish the same items or similar items with basically the same functions and roles. Those skilled in the art can understand that terms such as "first" and "second" do not limit the quantity and execution order, and "first", "second", etc. do not necessarily mean different.

[0064] In the embodiments of this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or explanations. Any embodiment or design solution described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Rather, using words such as "exemplary" or "for example" is intended to present relevant concepts in a specific way for easy understanding.

[0065] It can be understood that the "embodiments" mentioned throughout the specification mean that specific features, structures, or characteristics related to the embodiments are included in at least one embodiment of this application. Therefore, the various embodiments throughout the specification do not necessarily refer to the same embodiments. In addition, these specific features, structures, or characteristics can be combined in one or more embodiments in any suitable manner. It can be understood that in the various embodiments of this application, the magnitude of the serial numbers of the various processes does not mean the order of execution is prior or subsequent, and the execution order of the various processes should be determined by their functions and internal logics, and should not constitute any limitation to the implementation process of the embodiments of this application.

[0066] It can be understood that in this application, "when..." and "if" both refer to corresponding processing under certain objective circumstances, do not limit time, do not require a judgment action when implemented, and do not mean there are other limitations.

[0067] It can be understood that some optional features in the embodiments of the present application can, in some scenarios, be implemented independently without relying on other features, such as the current solution they are based on, to solve corresponding technical problems and achieve corresponding effects. In some scenarios, they can also be combined with other features according to requirements. Correspondingly, the devices given in the embodiments of the present application can also implement these features or functions accordingly, which will not be elaborated here.

[0068] In the present application, unless otherwise specified, the same or similar parts between various embodiments can be referred to each other. In various embodiments of the present application, as well as in each implementation manner / implementation method / realization method in each embodiment, if there is no special specification and logical conflict, the terms and / or descriptions between different embodiments, as well as between each implementation manner / implementation method / realization method in each embodiment, are consistent and can be cited mutually. The technical features in different embodiments, as well as in each implementation manner / implementation method / realization method in each embodiment, can be combined to form new embodiments, implementation manners, implementation methods, or realization methods according to their internal logical relationships. The implementation manners of the present application described below do not constitute a limitation on the protection scope of the present application.

[0069] In an integrated access and backhaul network, it includes IAB nodes (IAB-node) and IAB donors (IAB-donor). The IAB node can provide wireless access services for user equipment, and the service data of the UE is sent by the IAB node to the IAB donor through a wireless backhaul link. The IAB node can be connected to the IAB donor or can also be connected to the IAB donor through other IAB nodes.

[0070] The IAB node can include at least one MT and at least one DU. The IAB node can be an entity. For example, the IAB node includes at least one MT function and at least one DU function. The IAB node can also include multiple entities. For example, the IAB node includes at least one MT entity and at least one DU entity. Among them, the MT entity and the DU entity can communicate with each other, for example, communicate with each other through a network cable.

[0071] When the IAB node faces its parent node (the parent node can be an IAB donor or other IAB nodes), it can act as a terminal device, that is, the terminal role of the IAB node. In this case, the MT function or MT entity provides the terminal role for the IAB node. When the IAB node faces its child nodes (the child nodes can be other IAB nodes or terminal devices), it can act as a network device, that is, the network device role of the IAB node. In this case, the DU function or DU entity provides the network device role for the IAB node.

[0072] The IAB host can be an access network element with complete base station functions. The IAB host can include a centralized unit (CU) and at least one distributed unit (DU). Among them, the interface between the CU and the DU is the F1 interface. The two ends of the F1 interface are the CU and the DU respectively. The peer of the F1 interface of the CU is the DU, and the peer of the F1 interface of the DU is the CU.

[0073] For the convenience of description, in the following embodiments of this application, the MT of the IAB node is simply referred to as IAB-MT, and the DU of the IAB node is simply referred to as IAB-DU. The CU of the IAB host is simply referred to as the donor CU (Donor-CU), and the DU of the IAB host is simply referred to as the donor DU (Donor-DU).

[0074] The IAB network supports multi-hop networking and multi-connection networking to ensure the reliability of service transmission. On a transmission path between the terminal device and the IAB host, one or more IAB nodes can be included. Each IAB node needs to maintain a wireless backhaul link (BL) facing the parent node and a wireless link facing the child node. If the child node of the IAB node is a terminal device, the wireless link between this IAB node and the child node (i.e., the terminal device) is a wireless access link (AL). If the child node of the IAB node is another IAB node, the wireless link between this IAB node and the child node (i.e., another IAB node) is a wireless backhaul link. As Figure 1 shown, one of the transmission paths between the IAB host and the terminal device 2 is the transmission path "IAB host - IAB node 1 - IAB node 3 - IAB node 4 - terminal device 2".

[0075] As Figure 2 shown, the IAB-DU is logically connected to the Donor-CU through the F1 interface. In fact, the connection between the IAB-DU and the Donor-CU is realized through the Uu interface between the MT of each hop IAB node on the transmission path and the IAB-DU of its parent node. However, since the IAB-DU can finally communicate with the Donor-CU, it can be considered that there is an F1 interface between the IAB-DU and the Donor-CU logically.

[0076] The F1 interface includes the F1 interface control plane (F1-C) and the F1 interface user plane (F1-U). Through the F1-C, the IAB host can perform interface management, context-related configuration of the terminal device, management of the IAB-DU, etc. Through the F1-U, user plane data transmission, downlink transmission status feedback, etc. can be carried out between the IAB host and the IAB node.

[0077] Figure 3 and Figure 4 are respectively a schematic diagram of the control plane protocol stack and a schematic diagram of the user plane protocol stack in the IAB network provided by the embodiments of the present application. Figure 3 and Figure 4 A wireless backhaul link (the interface is the Uu interface) is established between the IAB node 2 and the IAB node 1, and between the IAB node 1 and the DU of the IAB host in []. The peer protocol stacks at both ends of the wireless backhaul link may include a backhaul adaptation protocol (BAP) layer, a radio link control (RLC) layer, a medium access control (MAC) layer, and a physical (PHY) layer. Figure 3 and Figure 4 There is a Uu interface between the terminal device and the IAB host in []. One end of the Uu interface is located at the terminal device, and the other end is located at the IAB host.

[0078] As Figure 3 shown, the peer control plane protocol stack at both ends of the Uu interface between the terminal device and the IAB host includes a radio resource control (RRC) layer, a packet data convergence protocol (PDCP) layer, an RLC layer, a MAC layer, and a PHY layer. There is an F1-C interface between the DU of the IAB node 2 and the CU of the IAB host. One end of the F1-C interface is located at the DU of the IAB node 2, and the other end is located at the CU of the IAB host.

[0079] As Figure 4 shown, the peer user plane protocol stack at both ends of the Uu interface between the terminal device and the IAB host includes a service data adaptation protocol (SDAP) layer, a PDCP layer, an RLC layer, a MAC layer, and a PHY layer. There is an FI-U interface between the DU of the IAB node 2 and the IAB host. One end of the F1-U interface is located at the DU of the IAB node 2, and the other end is located at the CU of the IAB host.

[0080] Referring to Figure 3 or Figure 4, the BAP layer is a new protocol layer introduced by the wireless backhaul link in the IAB network. The Donor-CU can assign a unique BAP address to each IAB node it controls and the Donor-DU, which is used to uniquely identify each IAB node and the Donor-DU in the network. In addition, the IAB node also needs to have an IP address, and the IP address on the IAB-DU side is related to the Donor-DU. When the IAB node and the Donor-DU are located in multiple transmission paths, the BAP address of the IAB node or the Donor-DU can be associated with multiple BAP path identifiers (identifiers, ID). The BAP address and the BAP path identifier (BAP path ID) can be collectively referred to as the BAP routing identifier (BAP routing ID). The BAP layer protocol stack of the source node (Donor-DU in the downlink direction, access IAB node in the uplink direction) can add a BAP header to the data packet. The BAP header can include the destination BAP address and the BAP path identifier, which respectively indicate the BAP address of the destination node (access IAB node in the downlink direction, Donor-DU in the uplink direction) and the path taken to reach the destination node.

[0081] The Donor-CU can configure a routing table for each IAB node it controls. The routing table includes the mapping relationship between the BAP routing address and the next-hop BAP address. After receiving a data packet, the IAB node can look up the routing table to determine the next-hop node and forward the data packet to the next-hop IAB node.

[0082] In some scenarios, such as in the dual-connection scenario, the IAB-MT can be connected to multiple parent nodes and multiple IAB hosts. The RRC anchor host of the IAB-MT can be called the master node (MN), and other IAB hosts except the master node can be called the secondary node (SN). Exemplarily, referring to Figure 5 , Figure 5 shows a scenario where the IAB-MT3 is in a dual-connection with the host CU1 and the host CU2. Taking CU1 as the MN and CU2 as the SN as an example, the IAB-MT3 transmits data through the topology under the host CU1 and the topology under the host CU2. The transmission path 1 for the IAB-MT3 to transmit data with CU1 through the topology under the host CU1 is: "IAB-MT3 → IAB-DU1 → IAB-MT1 → host DU1 → host CU1". The transmission path 2 for the IAB-MT3 to transmit data with CU1 through the topology under the host CU2 is: "IAB-MT3 → IAB-DU2 → IAB-MT2 → host DU2 → host CU2 → host CU1".

[0083] Referring to Figure 3, the link between the IAB-MT and the host CU is an RRC link. The amount of data transmitted over the RRC link is small. By establishing an F1 link between the IAB-DU and the host CU, a large amount of data can be transmitted.

[0084] The host connected to the IAB-DU can be called the F1 terminating donor. The F1 terminating donor can configure the default backhaul link default configuration (including at least one of the BAP address, the RLC channel of the default backhaul link, and the default BAP routing identifier) for the IAB-DU, thereby establishing an F1 interface between the CU of the F1 terminating donor and the IAB-DU, enabling the CU of the F1 target host and the IAB-DU to transmit data.

[0085] Refer to Figure 5 , when the host CU connected to the IAB-DU3 is the same as the host CU connected to the IAB-MT3, for example, the IAB-MT3 is connected to host-CU1 and host-CU2, and the IAB-DU3 is connected to host-CU1 or host-CU2. The IAB-DU3 can transmit data through the paths established by the IAB-MT3 and the host CU (such as the above transmission path 1 and transmission path 2).

[0086] In the case where both the IAB-DU3 and the IAB-MT3 are only connected to host-CU1, host-CU1 is the F1 terminating donor.

[0087] In the case where the IAB-MT3 is connected to multiple host-CUs and the IAB-DU3 is connected to one of the multiple host-CUs. The F1 terminating donor connected to the IAB-DU3 can be determined by the IAB-node3 or by the host-CU connected to the IAB-MT3. Taking the IAB-DU3 connected to host-CU1, the IAB-MT3 connected to host-CU1 and host-CU2, and host-CU1 being the MN as an example, the process of establishing an F1 connection between the IAB-DU3 and host-CU1 is introduced.

[0088] When the host-CU1 determines the F1 terminating donor, after the IAB-MT3 connects to the host-CU1, the host-CU1 sends a secondary station addition request message (such as SN ADDITION REQUEST) to the host-CU2. A cell indicating whether the host-CU2 is the F1 terminating donor is carried in the secondary station addition request message. If it indicates that the host-CU2 is not the F1 terminating donor, then the host-CU1 is the F1 terminating donor. The host-CU1 sends an RRC message with the default backhaul link default configuration to the IAB-MT3. The IAB-DU3 can transmit the first uplink F1 message (such as F1 SETUP REQUEST message) through the default configuration to establish an F1 connection with the host-CU1. If it indicates that the host-CU2 is the F1 terminating donor, then the host-CU2 sends an RRC message with the default backhaul link default configuration to the IAB-MT3, so that the IAB-DU3 establishes an F1 connection with the host-CU2. After the F1 interface is established, the F1 terminating donor can perform more BAP configurations and send other F1-C / U messages to the IAB node 3 through the F1 interface.

[0089] When the IAB-node3 determines the F1 terminating donor, the IAB-MT3 sends an RRC message to the host-CU (such as host-CU1) selected by the IAB-node3. The IP address of the IAB node 3 is carried in the RRC message. After receiving the RRC message, the host-CU1 knows that it is the F1 terminating donor and sends an RRC message carrying the default configuration information to the IAB-MT3.

[0090] In R18, a scenario where the host CU to which the F1 interface of the IAB-DU3 is connected is different from the host CU of the RRC connection of the IAB-MT3 is proposed. Refer to Figure 6, IAB-DU3 is connected to the host CU1, IAB-MT3 is connected to the host CU2, and the transmission path 3 between IAB-DU3 and the host CU1 is "IAB-DU3 → IAB-MT3 → IAB-DU2 → IAB-MT2 → host DU2 → host CU1". In this scenario, IAB-DU3 can transmit data through the topology under the host CU2. Path 3 can be called a cross-topology path. A cross-topology path can refer to: the traffic between an IAB-DU and its F1 anchor Donor-CU is transmitted through the topology under other Donor-CUs. However, this technology only provides a scenario where an IAB-MT is connected to 1 host CU, and an IAB-DU cannot transmit data to the F1 terminating donor through multiple paths.

[0091] Based on this, an embodiment of the present application provides a communication method. This method can, when the host CUs connected by the IAB-DU and the host CUs connected by the IAB-MT are different, enable the IAB-DU to transmit data to the host CU connected by the IAB-DU through multiple paths, increasing the data transmission capacity.

[0092] Refer to Figure 7 , Figure 7 is a schematic structural diagram of a communication system applicable to the method provided by the embodiment of the present application. This communication system includes a first host node, a second host node, a third host node, and a first IAB node. The MT in the first IAB node is connected to host-CU2 and host-CU3, and the first DU in the first IAB node is connected to host-CU1. Further, this communication system may also include a terminal device accessing the first IAB node.

[0093] Optionally, this communication system may also include a fourth host node, and the DU in the first IAB node can migrate from the connection with host-CU1 to the connection with host-CU4. For example, the connection between the first DU in the first IAB node and host-CU1 migrates to the connection between the second DU in the first IAB node and host-CU4.

[0094] Optionally, there may be other IAB nodes between the first IAB node and the second host node, and there may also be other IAB nodes between the first IAB node and the third host node.

[0095] Optionally, the first host node, the second host node, the third host node, or the fourth host node may include, but is not limited to: a next-generation base station (gNB), an evolved node B (eNB), a radio network controller (RNC), a node B (NB), a base station controller (BSC), a base transceiver station (BTS), a home evolved node B or a home node B, a transmission and reception point or a transmission point, a road side unit (RSU) with base station functions, a baseband unit (BBU), a remote radio unit (RRU), an active antenna unit (AAU), one or a group of antenna panels, or a node with base station functions in a subsequent evolved system, etc.

[0096] Optionally, the first host node may include a host CU function and a host DU function. In this case, the first host node may be understood as one entity. Or, the first host node may include a host CU entity and a host DU entity. In this case, the first host node may be divided into two entities. The description of the second host node may refer to the first host node and will not be elaborated here.

[0097] For ease of description, in the following embodiments of the present application, the host CU function or the host CU entity of the first host node is referred to as the first host node centralized unit Donor-CU1, and the host DU function or the host DU entity of the first host node is referred to as the first host node distributed unit Donor-DU1. The host CU function or the host CU entity of the second host node is referred to as the second host node centralized unit Donor-CU2, and the host DU function or the host DU entity of the second host node is referred to as the second host node distributed unit Donor-DU2. In addition, the first host node may also be referred to as the first IAB host, and the second host node may also be referred to as the second IAB host. The third host node and the fourth host node are similar to the above host nodes. All the features of the foregoing IAB hosts are applicable to the first host node to the fourth host node.

[0098] The first IAB node may be one entity, including an MT function and a first DU function. Or, the first IAB node may include an MT entity and a first DU entity.

[0099] Optionally, the first IAB node further includes a second DU function. Alternatively, the first IAB node may further include a second DU entity. The first DU entity and the second DU entity may share hardware resources, that is, use one DU entity to implement the functions of two logical DUs; or, the first DU entity and the second DU entity may also use different hardware resources, and the present application does not make specific limitations on this.

[0100] Optionally, in the mobile IAB scenario, the first IAB node may also be represented as an mIAB-node.

[0101] For ease of description, in the following embodiments of the present application, the MT function or MT entity of the first IAB node is simply referred to as the MT of the first IAB node, the first DU function or the first DU entity of the first IAB node is simply referred to as the first DU of the first IAB node, and the second DU function or the second DU entity of the first IAB node is simply referred to as the second DU of the first IAB node. In addition, all the features of the foregoing IAB node are applicable to the first IAB node.

[0102] Optionally, a terminal device is sometimes also referred to as a user equipment, a mobile station, a terminal, etc. Terminal devices can be widely applied to various scenarios, such as device-to-device (D2D), vehicle to everything (V2X) communication, machine-type communication (MTC), Internet of Things (IoT), virtual reality, augmented reality, industrial control, autonomous driving, remote medical treatment, smart grid, smart furniture, smart office, smart wearables, smart transportation, smart city, etc. The terminal device can be a mobile phone, a tablet computer, a computer with wireless transceiver function, a wearable device, a vehicle, a drone, a helicopter, an airplane, a ship, a robot, a robotic arm, a smart home device, etc. The present application does not make specific limitations on the specific name and implementation form of the terminal device.

[0103] Next, the method provided by the embodiments of the present application will be described in detail by taking the interaction between two or more nodes among the first host node to the fourth host node and the first IAB node as an example in conjunction with the accompanying drawings.

[0104] It can be understood that in the embodiments of the present application, the execution subject may execute some or all of the steps in the embodiments of the present application. These steps or operations are only examples, and the embodiments of the present application may also execute other operations or various deformations of the operations. In addition, each step may be executed in a different order presented in the embodiments of the present application, and it is possible not to execute all the operations in the embodiments of the present application.

[0105] It should be noted that the message names between various functions or entities in the following embodiments of this application, or the names of each piece of information in the message, etc. are only examples. In specific implementations, other names can also be used, and the embodiments of this application do not make specific limitations on this.

[0106] Taking the IAB-MT for dual connection (such as Donor-CU2 and Donor-CU3) as an example below, this application introduces how the IAB-DU transmits data to the host CU (such as Donor-CU1) connected to the IAB-DU through two paths. As Figure 8 shown, the communication method provided by the embodiments of this application includes the following steps:

[0107] S801. The first IAB node, Donor-CU2 or Donor-CU3 sends a first message to Donor-CU1. Correspondingly, Donor-CU1 receives the first message from one or more of the first IAB node, Donor-CU2 or Donor-CU3.

[0108] Among them, the first message indicates that the MT of the first IAB node is connected to Donor-CU2 and Donor-CU3. Donor-CU2 is the master station of the first IAB-MT, and Donor-CU3 is the secondary station of the first IAB-MT. Donor-CU1 is connected to the first IAB-DU.

[0109] In some embodiments, the first message includes first indication information.

[0110] In some embodiments, the first indication information includes one or more of the following: the identifier of Donor-CU3, the IAB node identifier assigned by Donor-CU3 to the first IAB node, the identifier of Donor-CU2, the IAB node identifier assigned by Donor-CU2 to the first IAB node, the indication information that Donor-CU2 is the master station, the indication information that Donor-CU3 is the secondary station, the indication information on whether there is a default backhaul link default configuration under Donor-CU2 or Donor-CU3, the primary cell identifier (Pcell ID) or the primary and secondary cell identifier (Pscell ID). Among them, the IAB node identifier assigned by Donor-CU2 to the first IAB node can also be referred to as the identifier of the MT of the first IAB node under Donor-CU2. The IAB node identifier assigned by Donor-CU3 to the first IAB node can also be referred to as the identifier of the MT of the first IAB node under Donor-CU3.

[0111] Subsequent to this, the Donor-CU1 may initiate a cross-topology transmission request to the Donor-CU3 based on the IAB node identifier allocated by the Donor-CU3 to the first IAB node, so as to transmit data with the first IAB node by using the topology under the Donor-CU3.

[0112] Exemplarily, the identifier of the Donor-CU2 is the gNB ID and / or the IP address. The identifier of the Donor-CU3 is the gNB ID and / or the IP address. The IAB node identifier allocated by the Donor-CU2 to the first IAB node may be identified by at least one of the BAP address, the IP address, and the UE XnAP ID allocated by the Donor-CU2 to the first IAB node. The IAB node identifier allocated by the Donor-CU3 to the first IAB node may be identified by at least one of the BAP address, the IP address, and the UE XnAP ID allocated by the Donor-CU3 to the first IAB node.

[0113] In some embodiments, the Pcell ID may include the identifier of the Donor-CU2. The first indication information may include only the identifier of the Donor-CU2 or the Pcell ID, or may include the identifier of the Donor-CU2 and the Pcell ID. The Pscell ID is similar to the Pcell ID and will not be elaborated here. The Donor-CU, the Pcell ID, and the Pscell ID in the first indication information hereinafter are also similar to the descriptions herein and will not be elaborated hereinafter.

[0114] In some embodiments, S801 may be implemented as S8011.

[0115] S8011, the Donor-CU2 sends a first message to the Donor-CU1. The first message is an Xn message. The following gives examples of the Donor-CU2 (an example of the first sending node) sending the first message to the Donor-CU1 in two scenarios.

[0116] Scenario 1: When the MT of the first IAB node establishes a connection with the Donor-CU2 and does not establish a connection with the Donor-CU3, the DU of the first IAB node establishes a connection with the Donor-CU1. That is to say, the DU of the first IAB node first establishes the F1 interface, and the MT of the first IAB node then establishes a dual connection.

[0117] The first indication information includes one or more of the following information: the identifier of the Donor-CU3, the Pscell ID, the IAB node identifier allocated by the Donor-CU3 to the first IAB node.

[0118] In some embodiments, after the MT of the first IAB node is successfully connected to Donor-CU2 and Donor-CU3, Donor-CU2 sends a first message to Donor-CU1. For example, Donor-CU2 receives an RRC reconfiguration complete message sent by the MT of the first IAB node.

[0119] In some embodiments, when Donor-CU2 determines that the MT of the first IAB node has established connections with Donor-CU2 and Donor-CU3, Donor-CU2 sends a first message to Donor-CU1. For example, Donor-CU2 receives a secondary station setup request response (such as S-NODE ADDITION REQUEST ACKNOWLEDGE) from Donor-CU3. As another example, Donor-CU2 sends an RRC message to the MT of the first IAB node indicating that the MT of the first IAB node accesses the primary and secondary cells.

[0120] Scenario 2: When the MT of the first IAB node establishes a dual connection with Donor-CU2 and Donor-CU3, the DU of the first IAB node establishes a connection with Donor-CU1. That is, the DU of the first IAB node first establishes a dual connection with Donor-CU2 and Donor-CU3, and then the MT of the first IAB node establishes an F1 interface with Donor-CU1.

[0121] In some embodiments, both Donor-CU2 and Donor-CU3 send a first message to Donor-CU1. In this scenario, the first indication information sent by Donor-CU2 includes one or more of the following information: the identifier of Donor-CU2, the Pcell ID, the IAB node identifier allocated by Donor-CU2 to the first IAB node, the indication information that Donor-CU2 is the master station, and the indication information whether Donor-CU2 has a default configuration. In this solution, Donor-CU2 sends its own information and its configuration information for the first IAB node to Donor-CU1, so that Donor-CU1 can use the topology under Donor-CU2 to transmit data with the first IAB node through the above information in the subsequent process. The information related to Donor-CU3 can be sent by Donor-CU3 to Donor-CU1. For specific details, refer to the relevant description of Scenario 2 in S8012 below.

[0122] Donor-CU1 can allocate traffic to Donor-CU2 based on whether there is indication information of the default configuration in Donor-CU2. For example, if Donor-CU2 has a default configuration, Donor-CU1 can directly allocate traffic to Donor-CU2 and use the topology under Donor-CU2 to communicate with the first IAB node. Another example is that if Donor-CU2 does not have a default configuration, Donor-CU1 can create a direct default configuration and then allocate traffic to Donor-CU2, using the topology under Donor-CU2 to communicate with the first IAB node. Donor-CU3 is similar to Donor-CU2 and will not be elaborated here.

[0123] In some other embodiments, Donor-CU2 sends a first message to Donor-CU1, and Donor-CU3 does not send a first message to Donor-CU1. In this scenario, the first indication information sent by Donor-CU2 includes one or more of the following information: the identifier of Donor-CU2, the identifier of Donor-CU3, Pcell ID, Pscell ID, the IAB node identifier allocated by Donor-CU2 to the first IAB node, the IAB node identifier allocated by Donor-CU3 to the first IAB node, the indication information that Donor-CU2 is the master station, the indication information that Donor-CU3 is the secondary station, the indication information of whether Donor-CU2 has a default configuration, and the indication information of whether Donor-CU3 has a default configuration. In this solution, Donor-CU2 sends its own information, its configuration information for the first IAB node, the information of Donor-CU3, and the configuration information of Donor-CU3 for the first IAB node to Donor-CU1, so that Donor-CU1 can use the topologies under Donor-CU2 and Donor-CU3 to transmit data to the first IAB node through the above information in the subsequent process.

[0124] In this solution, Donor-CU2 can obtain the above relevant information of Donor-CU3 through the Xn interface between Donor-CU2 and Donor-CU3. During the process of establishing a dual connection between the MT of the first IAB node and Donor-CU2 and Donor-CU3, Donor-CU2 and Donor-CU3 can exchange the relevant information of Donor-CU2 (such as the identifier of Donor-CU2, the IAB node identifier allocated by Donor-CU2 to the first IAB node) and the relevant information of Donor-CU3 (such as the identifier of Donor-CU3, the IAB node identifier allocated by Donor-CU3 to the first IAB node).

[0125] In some embodiments, S801 may be implemented as S8012.

[0126] S8012, Donor-CU3 sends a first message to Donor-CU1. The first message is an Xn message. The following gives examples of Donor-CU3 (an example of the first sending node) sending the first message to Donor-CU1 in two scenarios (the same as Scenario 1 and Scenario 2 above).

[0127] Scenario 1: The first indication information includes one or more of the following information: the identifier of Donor-CU3, the Pscell ID, the IAB node identifier allocated by Donor-CU3 to the first IAB node.

[0128] In some embodiments, after the MT of the first IAB node is successfully connected to Donor-CU2 and Donor-CU3, Donor-CU3 sends a first message to Donor-CU1. For example, the first IAB-MT randomly accesses Donor-CU3.

[0129] In some embodiments, when Donor-CU3 determines that the MT of the first IAB node is connected to Donor-CU2 and Donor-CU3, Donor-CU3 sends a first message to Donor-CU1. For example, Donor-CU3 receives a secondary station establishment request. Another example is that Donor-CU3 sends a secondary station establishment request response to Donor-CU2.

[0130] Scenario 2: The first indication information includes one or more of the following information:

[0131] In some embodiments, both Donor-CU2 and Donor-CU3 send a first message to Donor-CU1. In this scenario, the first indication information sent by Donor-CU3 includes one or more of the following information: the identifier of Donor-CU3, the Pscell ID, the IAB node identifier allocated by Donor-CU3 to the IAB node, the indication information that Donor-CU3 is a secondary station, the indication information of whether Donor-CU3 has a default configuration. In this solution, Donor-CU3 sends its own information and its configuration information for the first IAB node to Donor-CU1, so that Donor-CU1 can use the topology under Donor-CU3 to transmit data with the first IAB node through the above information in the follow-up.

[0132] In some other embodiments, Donor-CU3 sends a first message to Donor-CU1, and Donor-CU2 does not send a first message to Donor-CU1. In this scenario, the first indication information sent by Donor-CU3 includes one or more of the following information: the identifier of Donor-CU2, the identifier of Donor-CU3, Pcell ID, Pscell ID, the IAB node identifier allocated by Donor-CU2 to the first IAB node, the IAB node identifier allocated by Donor-CU3 to the first IAB node, the indication information that Donor-CU2 is the master station, the indication information that Donor-CU3 is the secondary station, the indication information whether Donor-CU2 has a default configuration, and the indication information whether Donor-CU3 has a default configuration. In this solution, Donor-CU3 sends its own information, its configuration information for the first IAB node, the information of Donor-CU2, and the configuration information of Donor-CU2 for the first IAB node to Donor-CU1, so that Donor-CU1 can use the topologies under Donor-CU2 and Donor-CU3 to transmit data with the first IAB node through the above information in the subsequent process.

[0133] Referring to the description of the embodiment in Scenario 2 of S8011 above, Donor-CU3 can obtain the relevant information of the above Donor-CU2 through the Xn interface.

[0134] In some embodiments, S801 can be implemented as S8013.

[0135] S8013. The first IAB node sends a first message to Donor-CU1. The first message is an F1 message. The following gives examples of the first IAB node (an example of the first sending node) sending a first message to Donor-CU1 in two scenarios (the same as Scenario 1 and Scenario 2 above).

[0136] Scenario 1: The first indication information includes one or more of the following information: the identifier of Donor-CU3, Pscell ID, or the IAB node identifier allocated by Donor-CU3 to the first IAB node.

[0137] Referring to Figure 9 , in some embodiments, before S8013, S901 is further included.

[0138] S901. The first IAB node receives the first indication information.

[0139] Exemplarily, S901 can be implemented as S9011.

[0140] S9011. The Donor-CU2 sends the first indication information to the first IAB node.

[0141] In some embodiments, after the MT of the first IAB node is successfully connected to the Donor-CU2 and the Donor-CU3, the Donor-CU2 sends the first indication information to the first IAB node.

[0142] In some other embodiments, when the Donor-CU2 determines that the MT of the first IAB node has established a connection with the Donor-CU2 and the Donor-CU3, the Donor-CU2 sends the first indication information to the first IAB node.

[0143] Exemplarily, S901 can be implemented as S9012.

[0144] S9012. The Donor-CU3 sends the first indication information to the first IAB node.

[0145] In some embodiments, after the MT of the first IAB node is successfully connected to the Donor-CU2 and the Donor-CU3, the Donor-CU3 sends the first indication information to the first IAB node.

[0146] In some other embodiments, when the Donor-CU3 determines that the MT of the first IAB node has established a connection with the Donor-CU2 and the Donor-CU3, the Donor-CU3 sends the first indication information to the first IAB node.

[0147] Scenario 2: The first indication information includes one or more of the following information: the identifier of the Donor-CU2, the identifier of the Donor-CU3, the Pcell ID, the Pscell ID, the IAB node identifier assigned by the Donor-CU2 to the first IAB node, the IAB node identifier assigned by the Donor-CU3 to the first IAB node, the indication information that the Donor-CU2 is the master station, the indication information that the Donor-CU3 is the slave station, the indication information whether the Donor-CU2 has a default configuration, and the indication information whether the Donor-CU3 has a default configuration.

[0148] Refer to Figure 10 , in some embodiments, before S8013, S902 is further included.

[0149] S902. The first IAB node receives the sixth indication information and the seventh indication information.

[0150] Exemplarily, S902 can be implemented as S9021 and S9022.

[0151] S9021. The Donor-CU2 sends the sixth indication information to the first IAB node. Correspondingly, the first IAB node receives the sixth indication information from the Donor-CU2.

[0152] The sixth indication information includes one or more of the following information: the identifier of the Donor-CU2, the Pcell ID, or the IAB node identifier allocated by the Donor-CU2 to the first IAB node.

[0153] S9022. The Donor-CU3 sends the seventh indication information to the first IAB node. Correspondingly, the first IAB node receives the seventh indication information from the Donor-CU3.

[0154] The seventh indication information includes one or more of the following information: the identifier of the Donor-CU3, the Pscell ID, or the IAB node identifier allocated by the Donor-CU3 to the first IAB node.

[0155] Exemplarily, S902 can be implemented as S9023 or S9024.

[0156] S9023. The Donor-CU2 sends the sixth indication information and the seventh indication information to the first IAB node. Correspondingly, the first IAB node receives the sixth indication information and the seventh indication information from the Donor-CU2.

[0157] S9024. The Donor-CU3 sends the sixth indication information and the seventh indication information to the first IAB node. Correspondingly, the first IAB node receives the sixth indication information and the seventh indication information from the Donor-CU3.

[0158] Among them, the sixth indication information and the seventh indication information are the same as the content in S9021 and S9022, and will not be elaborated here.

[0159] Exemplarily, the sixth indication information and / or the seventh indication information are carried in the RRC message.

[0160] In some embodiments, the first message includes a first field, and the first field indicates that the MT of the first IAB node is connected to the Donor-CU2 and the Donor-CU3. For example, when the first field is 1, it indicates that the MT of the first IAB node is connected to the Donor-CU2 and the Donor-CU3. For another example, when the first field is 0, it indicates that the MT of the first IAB node is connected to the Donor-CU2 and the Donor-CU3.

[0161] In some embodiments, the default values of the information related to Donor-CU2 and Donor-CU3 are stored in Donor-CU1, such as one or more of the first indication information in the above various examples. After Donor-CU1 receives the first message, it can determine that the first IAB node has established a dual connection with Donor-CU2 and Donor-CU3. For example, if the identifier of Donor-CU3 is stored in Donor-CU1, in scenario 1, the first indication information may include the IAB node identifier assigned by Donor-CU3 to the first IAB node.

[0162] S802. Donor-CU1 communicates with the first IAB node through the topology under Donor-CU2 and / or the topology under Donor-CU3.

[0163] After obtaining the information about the connection between the first IAB node and Donor-CU3, Donor-CU1 can initiate cross-topology traffic migration to Donor-CU3 in the subsequent process and communicate with the first IAB node using the topology under Donor-CU3. Thus, in the case of a large amount of data, by transmitting data together through the topology under Donor-CU2 and the topology under Donor-CU3, a larger bandwidth can be used to transmit data. In addition, the robustness of the communication system can be improved.

[0164] The above-mentioned communication between Donor-CU1 and the first IAB node through the topology under Donor-CU2 can be understood as: Donor-CU1 communicates with the first IAB node through Donor-DU2.

[0165] The above embodiments illustrate the indication of the dual connection between Donor-CU1, the first IAB node, Donor-CU2, and Donor-CU3. Next, an introduction is made to indicating one or more of Donor-CU2, Donor-CU3, and the first IAB node, where the F1 terminating donor of the first IAB node is Donor-CU1. Refer to Figure 11 , in some embodiments, the communication method provided by the embodiments of the present application further includes S1001.

[0166] S1001. The MT of Donor-CU2 or the first IAB node sends the third indication information to Donor-CU3. Correspondingly, Donor-CU3 receives the third indication information.

[0167] Among them, the third indication information indicates that there is or will be an F1 connection between the first IAB node and Donor-CU1. That is to say, it indicates that Donor-CU1 is the F1 terminating donor. The existence of the F1 connection means that the first IAB node has established an F1 connection with Donor-CU1.

[0168] Exemplarily, in the above scenario 1, the third indication information indicates that there is an F1 connection between the first IAB node and Donor-CU1. Again exemplarily, in the above scenario 2, the third indication information indicates that the first IAB node will establish an F1 connection with Donor-CU1.

[0169] In some embodiments, the third indication information includes the identifier of Donor-CU1 (such as: gNB ID and / or IP address).

[0170] In some embodiments, S1001 can be implemented as S10011.

[0171] S10011. The MT of the first IAB node sends the third indication information to Donor-CU3.

[0172] In some embodiments, the third indication information is carried in an RRC message.

[0173] In some embodiments, S1001 can be implemented as S10012.

[0174] S10012. Donor-CU2 sends the third indication information to Donor-CU3. Among them, Donor-CU2 can send the third indication information before Donor-CU3 establishes a connection with the MT of the first IAB node. For example, after determining that Donor-CU3 has established a connection with the MT of the first IAB node, send the third indication information. Donor-CU2 can also send the third indication information after Donor-CU3 establishes a connection with the MT of the first IAB node.

[0175] In some embodiments, the third indication information is carried in an Xn message. For example, the Xn message is an S-NODEADDITION REQUEST message.

[0176] In some embodiments, when S801 is implemented as S8012, S1001 can be executed before S8012. Donor-CU3 can send the first message to Donor-CU1 through the identifier of Donor-CU1.

[0177] In some embodiments, for example, in the above scenario 2, the method provided by the embodiments of the present application further includes S1003.

[0178] S1003. The first IAB node sends the fourth indication information to Donor-CU2. Correspondingly, Donor-CU2 receives the fourth indication information from the first IAB node.

[0179] The fourth indication information indicates that the first IAB node and Donor-CU1 are about to establish an F1 connection. Or rather, the fourth indication information indicates that Donor-CU2 allocates the default configuration to the MT of the first IAB node or Donor-CU2 causes Donor-CU3 to allocate the default configuration to the MT of the first IAB node.

[0180] In the related art, the F1 terminating donor allocates the default configuration to the first IAB node. In the embodiments of the present application, by sending the fourth indication information from the first IAB node to Donor-CU2, the default configuration is allocated to the MT of the first IAB node when the Donor-CU connected to the IAB node is not the F1 terminating donor.

[0181] In some embodiments, the fourth indication information is carried in the RRC message.

[0182] In some embodiments, the fourth indication information includes the identifier of Donor-CU1.

[0183] In some embodiments, Donor-CU2 can indicate whether Donor-CU3 allocates the default configuration to the MT of the first IAB node.

[0184] Exemplarily, S1003 can be located before S10012.

[0185] Exemplarily, in the above scenario 2, S1004 is further included.

[0186] S1004. Donor-CU2 sends the second indication information to Donor-CU3. Correspondingly, Donor-CU3 receives the second indication information from Donor-CU2.

[0187] The second indication information indicates whether Donor-CU3 allocates the default configuration to the MT of the first IAB node.

[0188] Exemplarily, the second indication information is carried in the Xn message, such as the S-NODE ADDITION REQUEST.

[0189] The second indication information may include the information required for allocating the default configuration (the information can also be referred to as a cell). For example, the above third indication information.

[0190] It should be noted that S1004 may be located after S1003. S1004 may be located before S10012, may be located after S10012, or may be sent in the same message as S10012. The embodiments of the present application do not limit its execution order.

[0191] In some embodiments, the second indication information may further include a second field. If the second field is 1, it means that Donor-CU3 needs to allocate a default configuration to the MT of the first IAB node. If the second field is 0, it means that Donor-CU3 does not need to allocate a default configuration to the MT of the first IAB node.

[0192] In other embodiments, if Donor-CU2 instructs Donor-CU3 to allocate a default configuration, the second indication information is sent. If Donor-CU2 allocates a default configuration, the second indication information is not sent. Through this solution, only when Donor-CU3 allocates a default configuration, Donor-CU2 sends the information required to allocate the default configuration to Donor-CU3, thereby saving communication resources.

[0193] In some embodiments, the second indication information includes third indication information. That is to say, when instructing Donor-CU3 to allocate a default configuration to the first IAB node, the F1 terminating donor of the first IAB node can be indicated to Donor-CU3 at the same time.

[0194] In some embodiments, after the MT of the first IAB node is successfully connected to Donor-CU2 and Donor-CU3, Donor-CU2 sends the second indication information to Donor-CU3.

[0195] In other embodiments, when Donor-CU2 determines that the MT of the first IAB node is connected to Donor-CU2 and Donor-CU3, Donor-CU2 sends the second indication information to Donor-CU3.

[0196] Exemplarily, in the above scenario 2, S1005 is further included.

[0197] S1005, the first IAB node sends the second indication information to Donor-CU3. Correspondingly, Donor-CU3 receives the second indication information from the first IAB node.

[0198] In some embodiments, the second indication information is carried in an RRC message. The relevant content of the second indication information may be the same as the above second indication information, and will not be elaborated here.

[0199] In some embodiments, S1006 may also be included.

[0200] S1006. Donor-CU2 or Donor-CU3 sends a second message to the first IAB node.

[0201] The second message includes the default configuration of the first IAB node.

[0202] In some embodiments, the second message also includes an IP address of the first IAB node. When Donor-CU2 sends the second message to the first IAB node, the IP address of the first IAB node may be allocated by Donor-CU2 to the first IAB node. When Donor-CU3 sends the second message to the first IAB node, the IP address of the first IAB node may be allocated by Donor-CU3 to the first IAB node.

[0203] In some embodiments, the second message is an RRC message.

[0204] Exemplarily, S1006 may be located after the above-mentioned S1003 or S1005.

[0205] In some embodiments, after the above S1006, S1007 may also be included.

[0206] S1007. The DU of the first IAB node initiates an F1 interface establishment request message to Donor-CU1.

[0207] In some embodiments, for example, in scenario 2 of S8013 above, the DU of the first IAB node may send the first indication information in the F1 interface establishment request message, or in other words, the first message is the F1 interface establishment request message. For example, the DU of the first IAB node is the first DU.

[0208] In the above embodiments, in Scenario 2, the first IAB node selects the F1 terminating donor. Thus, the first IAB node instructs Donor-CU2 and / or Donor-CU3 that Donor-CU1 is the F1 terminating donor. As in S1003, Donor-CU2 may determine that Donor-CU1 is the F1 terminating donor according to the fourth indication information, and allocate the default configuration to the first IAB node by itself or instruct Donor-CU3 to do so. Or as in S1005, the first IAB node sends the second indication information to Donor-CU3, so that Donor-CU3 knows that Donor-CU1 is the F1 terminating donor and knows whether it allocates the default configuration to the first IAB node.

[0209] An embodiment of the present application also provides a communication method. In Scenario 2, Donor-CU2 selects the F1 terminating donor. In this embodiment, there is no need to execute S1003 and S1005 above.

[0210] The embodiment of the present application includes S1004 and S1006. Among them, in S1006, the second message further includes the identifier of Donor-CU1. Thus, the first IAB node receives the identifier of Donor-CU1. By receiving the identifier of Donor-CU1, the first IAB node can determine that the node that allocates the default configuration to it (such as Donor-CU2 or Donor-CU3) is no longer the F1 terminating donor. Or rather, when the node that allocates the default configuration to the first IAB node is different from the node indicated by the F1 terminating donor obtained by the first node (such as: obtained through the second message), the first IAB node believes that the F1 terminating donor is not the node that allocates the default configuration, but the node indicated as the F1 terminating donor. When the first IAB node initiates the establishment of the F1 interface to the F1 terminating donor subsequently, it can determine that Donor-CU1 is the F1 terminating donor and initiate an F1 interface establishment request to Donor-CU1.

[0211] Through the above embodiments, Donor-CU1 can confirm that Donor-CU2 and Donor-CU3 are the master station and the secondary station respectively. Donor-CU2 and Donor-CU3 can confirm that Donor-CU1 is the F1 terminating donor. The identities of Donor-CU1, Donor-CU2, and Donor-CU3 are mutually confirmed. Based on this, an embodiment of the present application further provides a communication method, and this method includes S1101.

[0212] S1101. Donor-CU1 sends a first interface message to Donor-CU2 and / or Donor-CU3.

[0213] Among them, the control plane information of the F1 interface between Donor-CU1 and the first DU is carried in the first interface message. Exemplarily, the first interface message is F1-C TRAFFIC TRANSFER.

[0214] In some embodiments, the first interface message includes the f1c-TransferPathNRDC-r17 cell.

[0215] In some embodiments, the first interface message is an Xn message.

[0216] Through this solution, in the case where neither the master station nor the secondary station is the F1 terminating donor, the F1 terminating donor can also send a first interface message to the master station and / or the secondary station.

[0217] The above embodiments introduce that the first DU transmits data to the connected host CU through two paths. In an embodiment of the present application, referring to Figure 7 , the first IAB node includes a second DU, and the host node connected to the DU of the first IAB node migrates from the first host node to the fourth host node. As Figure 12 shown, the communication method provided by the embodiment of the present application includes the following steps:

[0218] S1201. The first IAB node, Donor-CU1, Donor-CU2 or Donor-CU3 sends a first message to Donor-CU4. Correspondingly, Donor-CU4 receives the first message from the first IAB node, Donor-CU1, Donor-CU2 or Donor-CU3.

[0219] Among them, the first message indicates that the MT of the first IAB node is connected to Donor-CU2 and Donor-CU3. Donor-CU2 is the master station of the first IAB-MT, and Donor-CU3 is the slave station of the first IAB-MT. Donor-CU1 has been connected to the DU of the first IAB node or is currently connected to the DU of the first IAB node. Donor-CU4 is about to be connected to the DU of the first IAB node. That is to say, Donor-CU1 is the source F1 terminating donor, and Donor-CU4 is the target F1 terminating donor.

[0220] For the relevant discussion of the first message in the embodiments of the present application, reference may be made to the above embodiments. For example, the first message may include first indication information, and the first indication information includes one or more of the following information: the identifier of Donor-CU2, the identifier of Donor-CU3, Pcell ID, Pscell ID, the IAB node identifier allocated by Donor-CU2 to the first IAB node, the IAB node identifier allocated by Donor-CU3 to the first IAB node, the indication information that Donor-CU2 is the master station, the indication information that Donor-CU3 is the slave station, the indication information whether Donor-CU2 has a default configuration, and the indication information whether Donor-CU3 has a default configuration. For another example, the first message may be an F1 interface establishment request message. For another example, one or more of the first IAB node, Donor-CU2, and Donor-CU3 may send an F1 interface establishment request message to Donor-CU4, and more content will not be elaborated here.

[0221] In the embodiments of the present application, Donor-CU1 may also send the first indication information to Donor-CU4. In this solution, Donor-CU1 has been connected to the DU of the first IAB node or is currently connected to the DU of the first IAB node, that is, Donor-CU1 has received the first indication information. Donor-CU1 may send the first indication information to Donor-CU4.

[0222] S1202. Donor-CU4 communicates with the first IAB node through the topology under Donor-CU2 and / or the topology under Donor-CU3.

[0223] Through the embodiments of the present application, Donor-CU4 can communicate with the first IAB node through the topologies under multiple host CUs, improving the transmission efficiency of the communication system.

[0224] It should be noted that steps such as Donor-CU2 or Donor-CU3 sending a second message to the first IAB node in the above embodiments are equally applicable in the embodiments of the present application and will not be elaborated here.

[0225] It should be noted that in the above embodiments, in the scenario where the host CU1 of the DU connection of the IAB node is different from the host CU2 and host CU3 of the MT connection of the IAB node, how the host CU1 and host CU4 communicate through the topologies under the host CU2 and host CU3 is introduced. For the case where the IAB-MT is connected to more host CUs (such as host CU5, host CU6, etc.), the method provided in the embodiments of the present application can also be used. In this scenario, the actions performed by the host CU2 or host CU3 can be replaced with the actions performed by the host CU3, host CU4, or host CU5. Or the actions performed by the host CU3, host CU4, and host CU5. Just replace the data related to Donor-CU3 sent between the nodes with the data related to multiple subordinate host-CUs (such as host CU3, host CU5, and host CU6).

[0226] It should be noted that the above-mentioned multiple embodiments can be combined and the combined solution can be implemented. Optionally, some operations in the processes of the method embodiments are optionally combined, and / or the order of some operations is optionally changed. Moreover, the execution order between the steps of each process is only exemplary and does not constitute a limitation on the execution order between the steps. The steps can also be in other execution orders. It is not intended to indicate that the execution order is the only order in which these operations can be performed. Those of ordinary skill in the art will think of various ways to reorder the operations herein. Additionally, it should be pointed out that the process details involved in a certain embodiment herein are equally applicable to other embodiments in a similar manner, or different embodiments can be combined and used.

[0227] It can be understood that in order to implement the functions in the above embodiments, the IAB host and IAB node include the corresponding hardware structures and / or software modules for performing each function. Those skilled in the art should easily realize that, in combination with the units and method steps of the examples described in the embodiments disclosed in the present application, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed in the form of hardware or computer software driving the hardware depends on the specific application scenario and design constraints of the technical solution.

[0228] Figure 13 and Figure 14A schematic structural diagram of a possible communication device provided by an embodiment of the present application. These communication devices can be used to implement the functions of the IAB host or IAB node in the above method embodiments, and thus can also achieve the beneficial effects of the above method embodiments. In the embodiments of the present application, the communication device can be, for example, Figure 1 the IAB host shown, or Figure 1 the IAB node 1, IAB node 2, etc. shown, or can also be a module (such as a chip) applied to the IAB host or IAB node.

[0229] For example, Figure 13 as shown, the communication device 1300 includes a processing unit 1310 and a transceiver unit 1320. The communication device 1300 is used to implement the functions of the IAB host or IAB node in the above Figure 8 , Figure 9 , Figure 10 , Figure 11 or Figure 12 method embodiments.

[0230] When the communication device 1300 is used to implement the function of the IAB host in the Figure 8 or Figure 12 method embodiments: The transceiver unit 1320 is used to receive the first message and communicate with the first IAB node through the topology under the IAB host indicated in the first message; the processing unit 1310 is used to perform processing-related functions. Or, the transceiver unit 1320 is used to send the first message or perform other transceiver-related functions; the processing unit 1310 is used to perform processing-related functions.

[0231] When the communication device 1300 is used to implement the function of the IAB node in the Figure 8 or Figure 12 method embodiments: The transceiver unit 1320 is used to communicate with the IAB host that receives the first message, and can also be used to send the first message or perform other transceiver-related functions; the processing unit 1310 is used to perform processing-related functions.

[0232] When the communication device 1300 is used to implement the function of the IAB host in the Figure 9 method embodiments: The transceiver unit 1320 is used to receive the first message and communicate with the first IAB node through the topology under the IAB host indicated in the first message; the processing unit 1310 is used to perform processing-related functions. Or, the transceiver unit 1320 is used to send the first indication information; the processing unit 1310 is used to perform processing-related functions.

[0233] When the communication device 1300 is used to implement the Figure 9When implementing the functions of the IAB node in the method embodiment shown: The transceiver unit 1320 is used to send a first message and communicate with the IAB host that receives the first message; the processing unit 1310 is used to perform functions related to processing.

[0234] When the communication device 1300 is used to implement Figure 10 When implementing the functions of the IAB host in the method embodiment shown: The transceiver unit 1320 is used to receive a first message and communicate with a first IAB node through the topology under the IAB host indicated in the first message; the processing unit 1310 is used to perform functions related to processing. Alternatively, the transceiver unit 1320 is used to send a sixth indication message; or, the transceiver unit 1320 is used to send a seventh indication message; or, the transceiver unit 1320 is used to send a sixth indication message and a seventh indication message; the processing unit 1310 is used to perform functions related to processing.

[0235] When the communication device 1300 is used to implement Figure 10 When implementing the functions of the IAB node in the method embodiment shown: The transceiver unit 1320 is used to send a first message and communicate with the IAB host that receives the first message; the processing unit 1310 is used to perform functions related to processing.

[0236] When the communication device 1300 is used to implement Figure 11 When implementing the functions of the IAB host in the method embodiment shown: The transceiver unit 1320 is used to receive a first message, communicate with a first IAB node through the topology under the IAB host indicated in the first message, send a first interface message to the IAB host indicated in the first message, and receive an F1 interface establishment request message; the processing unit 1310 is used to perform functions related to processing. Alternatively, the transceiver unit 1320 is used to send a second indication message, send a third indication message, send a first message, send a second message or receive a fourth indication message; or, the transceiver unit 1320 is used to receive a third indication message, receive a second indication message, send a second message or send a first message; the processing unit 1310 is used to perform functions related to processing.

[0237] When the communication device 1300 is used to implement Figure 11 When implementing the functions of the IAB node in the method embodiment shown: The transceiver unit 1320 is used to send a first message, communicate with the IAB host that receives the first message, send a third indication message, send a fourth indication message, send a second indication message, send an F1 interface establishment request message or receive a second message; the processing unit 1310 is used to perform functions related to processing. For a more detailed description of the above processing unit 1310 and transceiver unit 1320, reference can be made to Figures 8 to 12 the relevant description in the method embodiment shown.

[0238] As Figure 14As shown, the communication device 1400 includes a processor 1410 and an interface circuit 1420. The processor 1410 and the interface circuit 1420 are coupled to each other. It can be understood that the interface circuit 1420 can be a transceiver or an input / output interface. Optionally, the communication device 1400 may further include a memory 1430 for storing instructions executed by the processor 1410 or for storing input data required for the processor 1410 to run instructions or for storing data generated after the processor 1410 runs instructions.

[0239] When the communication device 1400 is used to implement Figures 8 to 12 any of the methods shown, the processor 1410 is used to implement the functions of the above-mentioned processing unit 1310, and the interface circuit 1420 is used to implement the functions of the above-mentioned transceiver unit 1320.

[0240] When the above communication device is a chip applied to an IAB node, the IAB node chip implements the functions of the IAB node in the above method embodiments. The IAB node chip receives information from the IAB host. It can be understood that this information is first received by other modules (such as a radio frequency module or an antenna) in the IAB node and then sent by these modules to the IAB node chip. The IAB node chip sends information to the IAB host. It can be understood that this information is first sent to other modules (such as a radio frequency module or an antenna) in the IAB node and then sent by these modules to the IAB host.

[0241] When the above communication device is a chip applied to an IAB host, the IAB host chip implements the functions of the IAB host in the above method embodiments. The IAB host chip receives information from the IAB node. It can be understood that this information is first received by other modules (such as a radio frequency module or an antenna) in the IAB host and then sent by these modules to the IAB host chip. The IAB host chip sends information to the IAB node. It can be understood that this information is sent to other modules (such as a radio frequency module or an antenna) in the IAB host and then sent by these modules to the IAB node.

[0242] In this application, when entity A sends information to entity B, it can be directly sent from A to B, or A can indirectly send it to B through other entities. Similarly, when entity B receives information from entity A, entity B can directly receive the information sent by entity A, or entity B can indirectly receive the information sent by entity A through other entities. Here, entity A and B can be RAN nodes or IAB nodes, or modules within RAN nodes or IAB nodes. The sending and receiving of information can be the information interaction between a RAN node and an IAB node. For example, the information interaction between an IAB host and an IAB node; the sending and receiving of information can also be the information interaction between two RAN nodes. For example, the information interaction between a CU and a DU; the sending and receiving of information can also be the information interaction between different modules within a device. For example, the information interaction between an IAB node chip and other modules of the IAB node, or the information interaction between an IAB host chip and other modules in the IAB host.

[0243] It can be understood that the processor in the embodiments of this application can be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. The general-purpose processor can be a microprocessor or any conventional processor.

[0244] The method steps in the embodiments of this application can be implemented in hardware or in software instructions executable by a processor. The software instructions can be composed of corresponding software modules. The software modules can be stored in a random access memory, flash memory, read-only memory, programmable read-only memory, erasable programmable read-only memory, electrically erasable programmable read-only memory, registers, hard disks, removable hard disks, CD-ROMs, or any other form of storage medium well known in the art. An exemplary storage medium is coupled to the processor so that the processor can read information from the storage medium and write information to the storage medium. The storage medium can also be a component of the processor. The processor and the storage medium can be located in an ASIC. Additionally, the ASIC can be located in an IAB host or an IAB node. The processor and the storage medium can also exist as discrete components in an IAB host or an IAB node.

[0245] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented in the form of a computer program product in whole or in part. The computer program product includes one or more computer programs or instructions. When the computer program or instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are executed in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, a network device, a user device, or other programmable devices. The computer program or instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer program or instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center in a wired or wireless manner. The computer-readable storage medium may be any available medium that can be accessed by a computer, or a data storage device such as a server or data center that integrates one or more available media. The available medium may be a magnetic medium, such as a floppy disk, a hard disk, or a magnetic tape; it may also be an optical medium, such as a digital video disc; or it may be a semiconductor medium, such as a solid-state drive. The computer-readable storage medium may be a volatile or non-volatile storage medium, or may include both volatile and non-volatile types of storage media.

[0246] In various embodiments of the present application, if there is no special description and logical conflict, the terms and / or descriptions between different embodiments are consistent and can be cross-referenced, and the technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationships.

Claims

1. A communication method, characterized in that, comprising: sending a first message, the first message indicating that a mobile terminal of an integrated access and backhaul node, i.e., IAB-MT, is connected to a second host node centralized unit, i.e., Donor-CU2, and a third host node centralized unit, i.e., Donor-CU3; the second host node is the master station of the IAB-MT, and the third host node is the secondary station of the IAB-MT; a first host node centralized unit, i.e., Donor-CU1, is connected to a distributed unit of the integrated access and backhaul node, i.e., IAB-DU, or the Donor-CU1 is about to be connected to the IAB-DU; wherein, the Donor-CU1 communicates with the IAB node through the topology under the Donor-CU2 and / or the topology under the Donor-CU3.

2. The method according to claim 1, characterized in that, further comprising: receiving second indication information, the second indication information indicating whether the Donor-CU3 allocates a default configuration to the IAB-MT.

3. The method according to claim 1, characterized in that, further comprising: sending second indication information, the second indication information indicating whether the Donor-CU3 allocates a default configuration to the IAB-MT.

4. The method according to any one of claims 1-3, characterized in that, further comprising: sending first indication information to the IAB node or sending first indication information to the Donor-CU1, the first indication information including one or more of the following: the identifier of the Donor-CU3, the IAB node identifier allocated by the Donor-CU3 to the IAB node, the identifier of the Donor-CU2, the IAB node identifier allocated by the Donor-CU2 to the IAB node, the indication information that the Donor-CU2 is the master station, the indication information that the Donor-CU3 is the secondary station, the indication information whether there is a default backhaul link default configuration under the Donor-CU2 or the Donor-CU3, the primary cell identifier, i.e., Pcell ID, and the primary and secondary cell identifier, i.e., PscellID.

5. The method according to claim 4, characterized in that, the first message includes the first indication information.

6. The method according to any one of claims 1-5, characterized in that, the method further comprises: sending third indication information, the third indication information indicating that there is or will be an F1 connection between the IAB node and the Donor-CU1.

7. The method according to any one of claims 1-6, characterized in that, the method further comprises: receiving third indication information, the third indication information indicating that there is or will be an F1 connection between the IAB node and the Donor-CU1.

8. The method according to claim 6 or 7, characterized in that, the third indication information includes the identifier of the Donor-CU1.

9. The method according to any one of claims 1-8, characterized in that, Sending the first message includes: After the IAB-MT is successfully connected to the Donor-CU2 and the Donor-CU3, sending the first message; or, When it is determined that the IAB-MT has established a connection with the Donor-CU2 and the Donor-CU3, sending the first message.

10. The method according to claim 9, wherein, Sending the first message includes: After the IAB-MT successfully accesses the cell under the Donor-CU3, the IAB node sends the first message; or, After the Donor-CU2 sends a secondary station addition request message, or after the Donor-CU2 receives a secondary station addition request confirmation message, the Donor-CU2 sends the first message; or, After the Donor-CU3 receives a secondary station addition request message, or after the Donor-CU3 sends a secondary station addition request confirmation message, the Donor-CU3 sends the first message.

11. The method according to any one of claims 1-10, wherein, It further includes: The Donor-CU2 and / or the Donor-CU3 receive an interface message from the Donor-CU1, and control plane information of the F1 interface between the Donor-CU1 and the IAB-DU is carried in the interface message.

12. A communication method, wherein, It includes: The first host node centralized unit Donor-CU1 receives a first message, and the first message indicates that a mobile terminal IAB-MT accessing the integrated access and backhaul node is connected to a second host node centralized unit Donor-CU2 and a third host node centralized unit Donor-CU3; the second host node is the master station of the IAB-MT, and the third host node is the secondary station of the IAB-MT; The Donor-CU1 is connected to the distributed unit IAB-DU of the integrated access and backhaul node, or the Donor-CU1 is about to be connected to the IAB-DU; The Donor-CU1 communicates with the IAB node through the topology under the Donor-CU2 and / or the topology under the Donor-CU3.

13. The method according to claim 12, wherein, It further includes: Receiving first indication information, the first indication information includes one or more of the following: the identifier of the Donor-CU3, the IAB node identifier allocated by the Donor-CU3 to the IAB node, the identifier of the Donor-CU2, the IAB node identifier allocated by the Donor-CU2 to the IAB node, indication information that the Donor-CU2 is the master station, indication information that the Donor-CU3 is the secondary station, indication information whether there is a default backhaul link default configuration under the Donor-CU2 or the Donor-CU3, the primary cell identifier Pcell ID, the primary and secondary cell identifier PscellID.

14. The method according to claim 13, wherein, The first message includes the first indication information.

15. The method according to any one of claims 12-14, wherein, further comprising: The Donor-CU1 sends an interface message to the Donor-CU2 and / or the Donor-CU3, and the control plane information of the F1 interface between the Donor-CU1 and the IAB-DU is carried in the interface message.

16. The method according to any one of claims 12-15, wherein, The Donor-CU1 receiving the first message includes: after the IAB-MT is successfully connected to the Donor-CU2 and the Donor-CU3, or when it is determined that a connection is established between the IAB-MT and the Donor-CU2 and the Donor-CU3, the Donor-CU1 receives the first message.

17. A communication method, wherein, comprising: The second host node centralized unit Donor-CU2 or the third host node centralized unit Donor-CU3 or the integrated access and backhaul IAB node sends a first message, and the first message indicates that the integrated access and backhaul node mobile terminal IAB-MT is connected to the Donor-CU2 and the Donor-CU3; the second host node is the master station of the IAB-MT, and the third host node is the slave station of the IAB-MT; the first host node centralized unit Donor-CU1 is connected to the integrated access and backhaul node distributed unit IAB-DU; or, The Donor-CU2 or the Donor-CU3 or the IAB node or the fourth host node centralized unit Donor-CU4 sends a first message, and the first message indicates that the IAB-MT is connected to the Donor-CU2 and the Donor-CU3; the second host node is the master station of the IAB-MT, and the third host node is the slave station of the IAB-MT; the Donor-CU4 is connected to the IAB-DU, and the Donor-CU1 is about to be connected to the IAB-DU; The Donor-CU1 receives the first message; The Donor-CU1 communicates with the IAB node through the topology under the Donor-CU2 and / or the topology under the Donor-CU3.

18. A communication system, wherein, comprising: The first host node centralized unit Donor-CU1, the second host node centralized unit Donor-CU2, the third host node centralized unit Donor-CU3, the integrated access and backhaul IAB node; The Donor-CU1 is configured to receive a first message, and the first message indicates that the integrated access and backhaul node mobile terminal IAB-MT is connected to the Donor-CU2 and the Donor-CU3; the second host node is the master station of the IAB-MT, and the third host node is the slave station of the IAB-MT; The Donor-CU2 or the Donor-CU3 or the IAB node is used to send the first message; The Donor-CU1 is further used to communicate with the IAB node through the topology under the Donor-CU2 and / or the topology under the Donor-CU3.

19. The system according to claim 18, wherein, further comprising: A fourth host node centralized unit Donor-CU4, which is connected to the IAB-DU when the Donor-CU1 is about to be connected to the IAB-DU; The Donor-CU2 or the Donor-CU3 or the IAB node or the Donor-CU4 is used to send the first message.

20. A communication device, wherein, comprising a processor and a memory; the memory is used to store computer instructions, and when the processor executes the instructions, the computer instructions are used to execute the method according to any one of claims 1 to 11, or the computer instructions are used to execute the method according to any one of claims 12 to 16.

21. A computer-readable storage medium, in which instructions are stored, wherein, when the instructions run on a communication device, the communication device is caused to execute the method according to any one of claims 1 to 11, or the communication device is caused to execute the method according to any one of claims 12 to 16.

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