Communication method and related device

Abstract

A communication method and a related device relate to the technical field of communication. The communication method comprises the following steps: a relay node sends first information to a first host node under the condition that a first trigger condition is met; the first information comprises a result of establishing the first F1 interface between the relay node and the target host node. According to the method, first information is sent to a first host node, so that the first host node knows that a relay node does not establish an F1 interface with a second host node indicated by the relay node, and / or the first host node knows that the relay node establishes the F1 interface with a target host node configured by a network manager; therefore, the first host node can initiate the switching process of the UE to the correct host node (namely the target host node), the situation that the relay node cannot normally complete the DU migration when the CU trigger and the OAM trigger conflict is avoided, and the relay node is ensured to successfully complete the DU migration.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a communication method and related devices. Background Art

[0002] Compared with the fourth generation mobile communication system, the fifth generation mobile communication (5th generation, 5G) and future mobile communication systems have put forward more stringent requirements for various network performance indicators. For example, compared with 4G, 5G has a capacity increase of 1,000 times, wider coverage requirements, ultra-high reliability and ultra-low latency, etc. On the one hand, considering the rich high-frequency carrier frequency resources, in hot spots, in order to meet the ultra-high capacity requirements of 5G, the use of high-frequency small base stations to form networks is becoming more and more popular. Due to the poor propagation characteristics of high-frequency carriers, severe attenuation due to obstruction, and a narrow coverage range, a large number of small base stations need to be deployed densely. However, the cost of providing fiber optic backhaul for these large and densely deployed small base stations is very high, and the construction is difficult, so an economical and convenient backhaul solution is needed. On the other hand, from the perspective of wide coverage requirements, in some remote areas, network coverage is provided, and the deployment of optical fiber is difficult and costly, and flexible and convenient access and backhaul solutions also need to be designed. Integrated access and backhaul (IAB) technology provides a solution to the above two problems: its access link (access link) and backhaul link (backhaul link, BL) both adopt wireless transmission solutions, reducing the deployment of optical fibers.

[0003] In the IAB network, the relay node RN (relay node) or IAB node (IAB node) can provide wireless access services and forwarding of service data for user equipment (UE). The service data of the UE is transmitted by the IAB node to the IAB donor through the wireless backhaul link. The IAB donor can also be called the donor node (donor node) or the donor gNodeB (DgNB). The IAB node consists of a mobile terminal (mobile termination, MT) part and a distributed unit (distributed unit, DU) part. Among them, when the IAB node faces its parent node, it can act as a terminal device, that is, the role of MT; when the IAB faces its child node (the child node may be another IAB node, or UE), it is regarded as a network device, that is, the role of DU. The donor base station (DgNB) can be an access network element with complete base station functions, or it can be an access network element in the form of a centralized unit (centralized unit, CU) and a distributed unit (distributed unit, DU) separated. The host base station is connected to the core network element (e.g., connected to the 5G core network) serving the UE and provides wireless backhaul function for the IAB node.

[0004] In the IAB network, the DU migration of the IAB node supports two triggering modes: source CU triggering and operation administration and maintenance (OAM) triggering. In the source CU triggering mode, the source CU will send an indication message carrying the target CU to the DU in the IAB node, and the DU will complete the migration operation based on the indication message. The source CU is the CU connected to the DU before the migration, and the target CU is the CU connected to the DU after the migration. In the OAM triggering mode, the OAM server can be directly pre-configured in the IAB node or remotely trigger the IAB node to perform DU migration. However, the source CU triggering and the OAM triggering will conflict, resulting in the IAB node being unable to complete the DU migration normally. Summary of the invention

[0005] The embodiments of the present application provide a communication method and related devices, so that when an IAB node performs DU migration, it is possible to handle the trigger conflict caused by CU triggering and OAM triggering, thereby ensuring that the IAB node completes the DU migration.

[0006] In the application, the CU (or host) connected to the MT and the CU (or host) connected to the DU refer to logical connections, which do not represent direct physical connections. For example, the MT has a radio resource control (RRC) connection with the CU to which it is connected, and the DU has an F1 interface connection with the CU to which it is connected. In addition, the logical connection may be in a state that is about to be established (for example: the DU has determined that an F1 connection will be established with a certain CU, but the F1 interface has not been established at this time, and the establishment of the F1 interface is about to be initiated), or in an established state (for example: the DU has established an F1 interface with the CU to which it is connected). In this application, the migration of a relay node generally refers to the migration of a DU in a relay node.

[0007] In a first aspect, an embodiment of the present application provides a communication method, which can be performed by a communication device. The communication device can be a device, or a chip (system) or circuit for a device, which is not limited in the present application. The method is applied to a relay node, including:

[0008] The relay node sends a first message to the first host node when the first trigger condition is met; the first message includes a result of the relay node establishing the first F1 interface with the target host node and an identifier of the target host node; or, the first message includes a result of the relay node establishing the first F1 interface with the target host node, an identifier of the target host node, and a triggering method for DU migration of the relay node;

[0009] The first trigger condition includes at least one of the following:

[0010] Based on second information provided by the network management, the second information is used to instruct the relay node to establish the first F1 interface with the target host node; or, the relay node receives third information from the first host node, and the third information is used to instruct the relay node to establish a second F1 interface with a second host node, and the second host node is different from the target host node.

[0011] In an embodiment of the present application, a communication method is provided, in which a relay node sends a first message to a first host node when a first trigger condition is met. The first message includes a result of establishing a first F1 interface between the relay node and the target host node, carries an identifier of the target host node and / or a triggering method for the DU migration, and the target host node is different from the second host node, so that the first host node knows that the relay node has not established an F1 interface with the second host node indicated by it, and / or the first host node knows that the relay node has established an F1 interface with the target host node configured by the network management, so that the first host node can initiate a UE switching process to the correct host node (i.e., the target host node), avoiding a situation in which the relay node cannot normally complete the DU migration due to a conflict between the CU trigger and the OAM trigger, and ensuring that the relay node successfully completes the DU migration.

[0012] The relay node in the embodiment of the present application may be a device equipped with a processor / chip that can be used to execute computer-executable instructions, or a processor / chip that can be used to execute computer-executable instructions. The relay node in the embodiment of the present application includes a terminal side part facing the parent node and a network side part facing the child node, for example, it may include MT and DU, or it may include MT and gNB, and the embodiment of the present application does not limit this. Among them, the DU migration of the relay node is completely decoupled from the MT migration, so the host node connected to the MT of the relay node and the host node connected to the DU may be different or the same. For example, the MT and DU of the relay node are both connected to the first host node, and for another example, the MT of the relay node is connected to the second host node, and the DU of the relay node is connected to the first host node. When the communication method in the embodiment of the present application is applied to the IAB network, the relay node may be an IAB node, the DU of the IAB node is connected to the first host node, and the host node connected to the MT of the IAB node is not limited in the embodiment of the present application, for example, it may be the first host node, the second host node or the target host node.

[0013] The first host node in the implementation manner of the present application may be a device equipped with a processor / chip that can be used to execute computer-executable instructions, or may be a processor / chip that can be used to execute computer-executable instructions. The first host node in the implementation manner of the present application is the source CU corresponding to the DU of the relay node, and the first host node is connected to the DU of the relay node before the relay node performs DU migration. When the communication method in the implementation manner of the present application is applied to an IAB network, the relay node may be an IAB node, and the first host node may be connected to the DU of the IAB node.

[0014] The second host node and the target host node in the implementation manner of the present application can be a device equipped with a processor / chip that can be used to execute computer-executable instructions, or a processor / chip that can be used to execute computer-executable instructions. The second host node in the implementation manner of the present application is the wrong host node after the DU is migrated, and the target host node is the correct host node after the DU is migrated. For example, in the case of a trigger conflict, the instruction triggered by the network manager shall prevail, then the host node indicated by the network manager is the correct host node, and the host node indicated by the first host node is the wrong host node. For example, in the case of a trigger conflict, the instruction triggered by the network manager shall prevail, the network manager instructs the DU of the relay node to be migrated to the third host node, and the first CU instructs the relay node to be migrated to the fourth host node. Then, the third host node is the correct host node, and the fourth host node is the wrong host node.

[0015] The network manager in the implementation mode of the present application can be a device equipped with a processor / chip that can be used to execute computer-executable instructions, or it can be a processor / chip that can be used to execute computer-executable instructions. The network manager in the implementation mode of the present application is a network manager of a relay node, which can communicate with the relay node. The network manager generally refers to an operation management and maintenance (orchestration and management, OAM) server. The OAM trigger mentioned above generally refers to OAM instructing the relay node to perform DU migration through pre-configuration or remote control. When the communication method in the implementation mode of the present application is applied to the IAB network, the network manager can be an OAM server, and the OAM server can be connected to the IAB node. For example, OAM is connected to the IAB node through the PDU session of MT, or OAM is directly connected to the IAB node through the IP network, and the embodiments of the present application are not limited to this.

[0016] The first trigger condition in the implementation manner of the present application includes, but is not limited to: based on the second information provided by the network management, the second information is used to instruct the relay node to establish a first F1 interface with the target host node. Alternatively, the relay node receives third information from the first host node, the third information is used to instruct the relay node to establish a second F1 interface with the second host node, and the second host node is different from the target host node.

[0017] The first information in the implementation manner of the present application includes the result of the relay node and the target host node establishing the first F1 interface. The result may be, for example, that the relay node and the target host node complete the establishment of the F1 interface, or that the relay node and the target host node do not complete the establishment of the F1 interface, etc. The implementation manner of the present application does not limit this. Optionally, the first information may be carried in an F1 application protocol (F1 application protocol, F1AP) message, and the F1AP message may also carry an identifier of the target host node, such as a gNB ID and / or an IP address, etc. The identification of the target host node carried in the first information can facilitate the first host node to communicate with the target host node and instruct the target host node to perform UE switching. In a possible implementation manner, the identification of the target host node carried in the first information may also be represented by an identification of the target cell (i.e., the cell under the target DU) (e.g., NR cell global identification NCGI), and the first host node may obtain the identification of the target host node based on the identification of the target cell.

[0018] In some scenarios, the first information may also carry a triggering method for DU migration (for example, an OAM trigger). Specifically, in a scenario where there is a conflict between the CU trigger and the OAM trigger, the OAM trigger shall prevail. Carrying the triggering method for DU migration (for example, an OAM trigger) in the first information can let the first host node know the reason why the relay node did not establish the F1 interface according to its instructions.

[0019] Optionally, the first information can be carried in a class 1RESPONSE message or a REJECT / FAILURE message of a CU-triggered F1 message, or in a separate class 2 message. Among them, the class 1 message needs to get a response from the other end, and the class 2 message does not need to get a response from the other end. For example, the relay node sends a class 1 message (such as RESPONSE / REJECT / FAILURE) to the first host node in response to another class 1 message (such as REQUEST) sent by the first host node to the relay node. When the relay node sends a class 2 message to the first host node, it does not need to be a response message to a specific message, and the class 2 message can be understood as a notification message.

[0020] The second information may be information pre-configured by the network manager. For example, the pre-configuration information instructs the relay node to perform DU migration at a specified time point. Specifically, the pre-configuration information instructs the relay node to start DU migration one hour after joining the network. The implementation method of the present application does not limit how to pre-configure, the content of the pre-configuration information, etc. The second information may also be sent to the relay node by the network manager through remote control. For example, the network manager may send the second information to the relay node through the PDU session of the MT or the IP network.

[0021] It can be understood that when the first trigger condition is met, the relay node generates the first information, and the first trigger condition at this time can be understood as a condition that triggers the relay node to generate the first information. Optionally, when the first trigger condition is met, the relay node will also send the first information, and the first trigger condition at this time can be understood as a condition that triggers the relay node to generate and send the first information.

[0022] In the IAB network, the DU migration of the IAB node supports two triggering modes: source CU triggering and OAM triggering. In the source CU triggering (hereinafter referred to as "CU triggering") mode, the source CU will send an indication message carrying the target CU to the DU in the IAB node, and the DU will complete the migration operation based on the indication message. The source CU is the CU connected to the DU before the migration, and the target CU is the CU connected to the DU after the migration. In the OAM triggering mode, the OAM server can be directly pre-configured in the IAB node or remotely trigger the IAB node to perform DU migration. Obviously, both CU triggering and OAM triggering can instruct the relay node to perform DU migration. If the CU triggering and OAM triggering occur at the same time, the relay node may not be able to complete the DU migration normally, or may migrate to the wrong host node. In addition, in the case of a conflict between the two triggers, at least one trigger indication (such as CU triggering) is not completed, which may also cause abnormalities such as control failure and information transmission errors.

[0023] In the implementation manner of the present application, a first trigger condition for generating (or generating and sending) the result of establishing an F1 interface between a relay node and a target host node is clearly given, wherein the result of establishing the F1 interface can be used to enable the first host node to send UE switching indication information to the correct host node, thereby avoiding the situation where the DU migration of the relay node cannot be completed normally or the migration is wrong. When the relay node meets the first trigger condition, the relay node can generate (or generate and send) the first information in a timely manner, so that the first host node can initiate a switching request of the user equipment (UE) to the correct host node (target host node) according to the first information, so that the relay node can complete the DU migration normally, and avoid the DU of the relay node from being migrated to the wrong host node.

[0024] In a possible implementation, when the first trigger condition is not met, for example: the F1 interface is not established based on the second information (for example: the second information does not exist), or the second host node is the same as the target host node, when the result of establishing the first F1 interface with the target host node is sent to the first host node, the identifier of the target host node is not carried, and optionally, the triggering method of DU migration can be carried. Through this implementation, the first host node can be implicitly indicated that the target host node is the one selected by the first host node, or is the same as the one selected by the first host node, so that the signaling overhead is reduced under the premise that the first host node can correctly judge the target host node.

[0025] In a possible implementation manner, the result of the first F1 interface is that the F1 interface between the relay node and the target host node is established completely.

[0026] In the implementation manner of the present application, the result of the first F1 interface is that the F1 interface between the relay node and the target host node is established (complete), wherein the target host node is different from the host node indicated by the CU trigger, or the target node is not indicated by the CU trigger. The relay node sends the information that its F1 interface is established to the first host node through the first information, so that the first host node can instruct the correct host node (target host node) to switch the UE, so that the relay node can successfully complete the DU migration.

[0027] In a possible implementation manner, the second information is further used to trigger the release of the second F1 interface.

[0028] In the implementation manner of the present application, the second information is used to instruct the relay node to establish a first F1 interface with the target host node, and the second F1 interface is the F1 interface between the relay node and the second host node. If the relay node has established a second F1 interface with the second host node before receiving the second information, the second information will be used to trigger the release of the second F1 interface. This enables the relay node to establish the first F1 interface with the target host node. In addition, it can also save resources of the second host node, making it easier for the second host node to establish an F1 interface with other relay nodes.

[0029] Optionally, the second information provided by the network management is equivalent to an OAM trigger, and the OAM trigger may occur after the CU trigger and before the relay node receives the second F1 interface establishment completion message. For example, the OAM trigger may occur after the relay node sends an F1 interface establishment message to the second host node and before the relay node receives an F1SETUP RESPONSE message from the second host node.

[0030] In a possible implementation manner, the first information further includes an identifier of the target host node and / or a triggering method for the DU migration.

[0031] In an embodiment of the present application, the identifier of the target host node may be, for example, a gNB ID and / or an IP address, etc. The triggering method for DU migration may be, for example, an OAM trigger. The first information carries the identifier of the target host node, which can facilitate the first host node to communicate with the target host node and instruct the target host node to switch the UE. The first information carries the triggering method for DU migration, which enables the first host node to know the reason why the relay node did not establish the F1 interface according to its instructions. The identifier of the target host node can also be represented by the identifier of the target cell (such as: NCGI), and the first host node can obtain the identifier of the target host node based on the identifier of the target cell.

[0032] Optionally, when the first F1 interface is an F1 interface established by an OAM trigger indication and / or the OAM trigger is inconsistent with the CU trigger, the first information may include a triggering method for DU migration.

[0033] Optionally, the first information can be carried in a class 1RESPONSE message or a REJECT / FAILURE message of a CU-triggered F1 message, or in a separate class 2 message. Among them, the class 1 message needs to get a response from the other end, and the class 2 message does not need to get a response from the other end. For example, the relay node sends a class 1 message (such as RESPONSE / REJECT / FAILURE) to the first host node in response to another class 1 message (such as REQUEST) sent by the first host node to the relay node. When the relay node sends a class 2 message to the first host node, it does not need to be a response message to a specific message, and the class 2 message can be understood as a notification message.

[0034] In a second aspect, an embodiment of the present application provides a communication method, which can be performed by a communication device. The communication device can be a device, or a chip (system) or circuit for a device, which is not limited in the present application. The method is applied to a first host node, including:

[0035] When the first trigger condition is met, the first host node receives first information from the relay node; the first information includes a result of the relay node establishing the first F1 interface with the target host node and an identifier of the target host node; or, the first information includes a result of the relay node establishing the first F1 interface with the target host node, an identifier of the target host node, and a triggering method for DU migration of the relay node;

[0036] The first trigger condition includes at least one of the following:

[0037] Based on second information provided by the network management, the second information is used to instruct the relay node to establish the first F1 interface with the target host node; or, the relay node receives third information from the first host node, and the third information is used to instruct the relay node to establish a second F1 interface with a second host node, and the second host node is different from the target host node.

[0038] The relay node in the embodiment of the present application may be a device equipped with a processor / chip that can be used to execute computer-executable instructions, or a processor / chip that can be used to execute computer-executable instructions. The relay node in the embodiment of the present application includes a terminal side part facing the parent node and a network side part facing the child node, for example, it may include MT and DU, or it may include MT and gNB, and the embodiment of the present application does not limit this. Among them, the DU migration of the relay node is completely decoupled from the MT migration, so the host node connected to the MT of the relay node and the host node connected to the DU may be different or the same. For example, the MT and DU of the relay node are both connected to the first host node, and for another example, the MT of the relay node is connected to the second host node, and the DU of the relay node is connected to the first host node. When the communication method in the embodiment of the present application is applied to the IAB network, the relay node may be an IAB node, the DU of the IAB node is connected to the first host node, and the host node connected to the MT of the IAB node is not limited in the embodiment of the present application, for example, it may be the first host node, the second host node or the target host node.

[0039] The first host node in the implementation manner of the present application may be a device equipped with a processor / chip that can be used to execute computer-executable instructions, or may be a processor / chip that can be used to execute computer-executable instructions. The first host node in the implementation manner of the present application is the source CU corresponding to the DU of the relay node, and the first host node is connected to the DU of the relay node before the relay node performs DU migration. When the communication method in the implementation manner of the present application is applied to an IAB network, the relay node may be an IAB node, and the first host node may be connected to the DU of the IAB node.

[0040] The second host node and the target host node in the implementation manner of the present application can be a device equipped with a processor / chip that can be used to execute computer-executable instructions, or a processor / chip that can be used to execute computer-executable instructions. The second host node in the implementation manner of the present application is the wrong host node after the DU is migrated, and the target host node is the correct host node after the DU is migrated. For example, in the case of a trigger conflict, the instruction triggered by the network manager shall prevail, then the host node indicated by the network manager is the correct host node, and the host node indicated by the first host node is the wrong host node. For example, in the case of a trigger conflict, the instruction triggered by the network manager shall prevail, the network manager instructs the DU of the relay node to be migrated to the third host node, and the first CU instructs the relay node to be migrated to the fourth host node. Then, the third host node is the correct host node, and the fourth host node is the wrong host node.

[0041] The network manager in the implementation mode of the present application can be a device equipped with a processor / chip that can be used to execute computer-executable instructions, or it can be a processor / chip that can be used to execute computer-executable instructions. The network manager in the implementation mode of the present application is a network manager of a relay node, which can communicate with the relay node. The network manager generally refers to an operation management and maintenance (orchestration and management, OAM) server. The OAM trigger mentioned above generally refers to OAM instructing the relay node to perform DU migration through pre-configuration or remote control. When the communication method in the implementation mode of the present application is applied to the IAB network, the network manager can be an OAM server, and the OAM server can be connected to the IAB node. For example, OAM is connected to the IAB node through the PDU session of MT, or OAM is directly connected to the IAB node through the IP network, and the embodiments of the present application are not limited to this.

[0042] The first information in the implementation manner of the present application includes the result of the relay node and the target host node establishing the first F1 interface. The result may be, for example, that the relay node and the target host node complete the establishment of the F1 interface, or that the relay node and the target host node do not complete the establishment of the F1 interface, etc. The implementation manner of the present application does not limit this. Among them, the first information may be, for example, a message carried in the F1 application protocol (F1 application protocol, F1AP), which carries the identifier of the target host node, such as the gNB ID and / or IP address, etc. The identifier of the target host node carried in the first information can facilitate the first host node to communicate with the target host node and instruct the target host node to switch the UE. In a possible implementation manner, the identifier of the target host node carried in the first information can also be represented by the identifier of the target cell (such as: NR cell global identifier NCGI), and the first host node can obtain the identifier of the target host node based on the identifier of the target cell.

[0043] In some scenarios, the first information may also carry a triggering method for DU migration (for example, an OAM trigger). Specifically, in a scenario where there is a conflict between the CU trigger and the OAM trigger, the OAM trigger shall prevail. Carrying the triggering method for DU migration (for example, an OAM trigger) in the first information can let the first host node know the reason why the relay node did not establish the F1 interface according to its instructions.

[0044] Optionally, the first information can be carried in a class 1RESPONSE message or a REJECT / FAILURE message of a CU-triggered F1 message, or in a separate class 2 message. Among them, the class 1 message needs to get a response from the other end, and the class 2 message does not need to get a response from the other end. For example, the relay node sends a class 1 message (such as RESPONSE / REJECT / FAILURE) to the first host node in response to another class 1 message (such as REQUEST) sent by the first host node to the relay node. When the relay node sends a class 2 message to the first host node, it does not need to be a response message to a specific message, and the class 2 message can be understood as a notification message.

[0045] Normally, the result of establishing the F1 interface returned by the relay node to the first host node does not carry the identifier of the target host node, and the first host node sends an indication of UE switching to the designated host node based on the indication information in the CU trigger. For example, the CU instructs the relay node to establish an F1 interface with the second host node, and after the establishment of the F1 interface is completed, the first host node sends an indication of UE switching to the second host node.

[0046] In a possible implementation, when the first trigger condition is not met, for example, the relay node does not establish an F1 interface based on the second information (for example, the second information does not exist), or the second host node is the same as the target host node, the result of the first host node receiving the first F1 interface does not carry the identifier of the target host node, and optionally, may carry the triggering method for DU migration. Through this implementation, the first host node can be implicitly indicated that the target host node is the one selected by the first host node, or is the same as the one selected by the first host node, so that the signaling overhead is reduced under the premise that the first host node can correctly judge the target host node.

[0047] In a possible implementation, the first host node can infer the triggering mode of DU migration and / or infer whether the second host node is different from the target host node by whether the relay node carries the identifier of the target host node when sending the F1 interface establishment result. Specifically, if the relay node carries the identifier of the target host node when sending the F1 interface establishment result, the first host node believes that the DU migration is triggered by OAM and / or that the second host node is different from the target host node; if the relay node does not carry the identifier of the target host node when sending the F1 interface establishment result, the first host node believes that the DU migration is triggered by the first host node, or that the second host node is the same as the target host node.

[0048] In one possible scenario, the first host node sends a UE handover instruction to the second host node, but the relay node does not establish an F1 interface with the second host node, and the relay node actually establishes an F1 interface with the target host node. In this case, a handover anomaly may occur, causing the relay node to fail to complete DU migration normally.

[0049] In the implementation manner of the present application, the first host node receives the first information indicating the result of the relay node establishing the first F1 interface with the target host node, so that the first host node knows that the relay node establishes the F1 interface with the target host node, and sends the target host node an indication of UE switching, thereby ensuring that the relay node successfully completes the DU migration.

[0050] In a possible implementation, the result of the first F1 interface is that the F1 interface between the relay node and the target host node is established. The beneficial effects of this implementation can refer to the beneficial effects of the corresponding implementation in the first aspect, which will not be repeated here.

[0051] In a third aspect, an embodiment of the present application provides a communication method, which can be performed by a communication device. The communication device can be a device, or a chip (system) or circuit for a device, which is not limited in the present application. The method is applied to a relay node, including:

[0052] The relay node sends fourth information to the network manager; the fourth information includes the result of the relay node establishing the third F1 interface with the target host node.

[0053] In an embodiment of the present application, a communication method is provided, in which a relay node sends a fourth information to a network manager, so that the network manager can obtain the current correct connection relationship of the relay node (the result of the relay node establishing a third F1 interface with the target host node), which facilitates the network manager to perform subsequent management and trigger the next DU migration of the relay node, thereby ensuring that the relay node can obtain the correct indication information during the subsequent DU migration process, so that the relay node can complete the DU migration normally.

[0054] The relay node, the first host node, the second host node, the target host node and the OAM server in the implementation manner of the present application can refer to the description corresponding to the first aspect or the second aspect above, which will not be repeated here.

[0055] The fourth information in the implementation manner of the present application includes the result of the relay node and the target host node establishing the third F1 interface, which may be, for example, that the relay node and the target host node complete the establishment of the F1 interface, or that the relay node and the target host node do not complete the establishment of the F1 interface, etc., and the implementation manner of the present application does not limit this. Among them, the fourth information may carry an identifier of the target host node, such as a gNB ID and / or an IP address, and / or carry an identifier of the target cell, such as an NR cell global identifier NCGI.

[0056] In a possible implementation manner, the relay node sends the fourth information to the network manager when the second trigger condition is met;

[0057] The second trigger condition includes at least one of the following:

[0058] The relay node receives fifth information from the first host node, and the fifth information is used to instruct the relay node to establish the third F1 interface with the target host node; or, based on sixth information provided by the network management, the sixth information is used to instruct the relay node to establish a fourth F1 interface with the second host node, and the second host node is different from the target host node; or, the relay node receives seventh information from the target host node, and the seventh information is used to indicate that the establishment of the third F1 interface is completed.

[0059] An embodiment of the present application provides a communication method, in which the relay node sends a fourth message to the network manager when the second trigger condition is met, so that when a conflict occurs between the CU trigger and the OAM trigger, the network manager can obtain the correct connection relationship of the relay node through the fourth message, thereby facilitating the network manager's subsequent management of the relay node and triggering the next DU migration of the relay node.

[0060] The second trigger condition in the implementation manner of the present application includes, but is not limited to: the relay node receives fifth information from the first host node, the fifth information is used to indicate that the relay node establishes a third F1 interface with the target host node. Alternatively, based on the sixth information provided by the network management, the sixth information is used to indicate that the relay node establishes a fourth F1 interface with the second host node, and the second host node is different from the target host node. Alternatively, the relay node receives seventh information from the target host node, and the seventh information is used to indicate that the establishment of the third F1 interface is complete.

[0061] The fifth information may be carried in an F1AP message. The fifth information is used to instruct the relay node to establish a third F1 interface with the target host node, and may be a message instructing the relay node to send a request to establish an F1 interface to the target host node.

[0062] Among them, the sixth information mentioned above can be a message preconfigured by the network manager in the relay node. The preconfigured time can be, for example, before the relay node enters the network, or after the relay node enters the network. The implementation method of the present application does not limit this. The preconfigured information can instruct the relay node to perform DU migration and the host node of the DU migration at a preset time. For example, the preconfigured information can instruct the relay node to start DU migration one hour after entering the network, and instruct the relay node to migrate to the CU of the target host node. The sixth information can also be a message sent by the network manager to the relay node through remote control triggering. For example, the sixth message is sent to the relay node remotely through the PDU session of the MT or the IP network, instructing the relay node to establish a second F1 interface with the second host node.

[0063] The seventh information may be carried in an F1AP message, such as F1 SETUP RESPONSE. The relay node may generate the seventh information after receiving a message (such as F1 SETUP RESPONSE) indicating that the F1 interface establishment is completed returned by the target host node.

[0064] It can be understood that when the second trigger condition is met, the relay node generates the fourth information, and the second trigger condition can be understood as a condition that triggers the relay node to generate the fourth information. Optionally, when the second trigger condition is met, the relay node will also send the fourth information, and the second trigger condition can be understood as a condition that triggers the relay node to generate and send the fourth information.

[0065] In the IAB network, the DU migration of the IAB node supports two triggering modes: source CU triggering and OAM triggering. In the source CU triggering (hereinafter referred to as "CU triggering") mode, the source CU will send an indication message carrying the target CU to the DU in the IAB node, and the DU will complete the migration operation based on the indication message. The source CU is the CU connected to the DU before the migration, and the target CU is the CU connected to the DU after the migration. In the OAM triggering mode, the OAM server can be directly pre-configured in the IAB node or remotely trigger the IAB node to perform DU migration. Obviously, both CU triggering and OAM triggering can instruct the relay node to perform DU migration. If the CU triggering and OAM triggering occur at the same time, the relay node may not be able to complete the DU migration normally, or may migrate to the wrong host node. In addition, in the case of a conflict between the two triggers, at least one trigger indication (such as an OAM trigger) is not completed, which may also cause abnormalities such as control failure and information transmission errors.

[0066] In the implementation manner of the present application, the first trigger condition for generating (or generating and sending) the result of establishing the F1 interface between the relay node and the target host node is clearly given, wherein the result of establishing the F1 interface can be used to enable OAM to obtain the latest connection status of the relay node. When the relay node meets the first trigger condition, the relay node can generate (or generate and send) the first information in a timely manner, so that OAM can update the connection status of the relay node in a timely manner, which is convenient for OAM to subsequently manage the relay node and re-trigger the DU migration of the relay node. Obviously, this situation is based on the indication information triggered by the CU. After the relay node establishes an F1 interface connection with the new host node (target host node), the first host node can send an indication of UE switching to the new host node. The first host node obtains that the relay node completes the establishment of a new F1 interface, for example, it can be a message that the relay node sends the F1 interface establishment completion to the first host node, for example, the relay node sends a message that the F1 interface establishment completion to the first host node through an F1AP message. Specifically, the implementation manner of the present application is not limited.

[0067] In a possible implementation manner, the fifth information is also used to trigger the release of the fourth F1 interface.

[0068] In the implementation manner of the present application, the fifth information is used to instruct the relay node to establish a third F1 interface with the target host node, and the fourth F1 interface is the F1 interface between the relay node and the second host node. If the relay node has established the fourth F1 interface with the second host node before receiving the fifth information, the fifth information will be used to trigger the release of the fourth F1 interface. This enables the relay node to establish the third F1 interface with the target host node. In addition, it can also save the resources of the second host node, making it easier for the second host node to establish an F1 interface with other relay nodes.

[0069] Optionally, the fifth information provided by the network management is equivalent to an OAM trigger, and the OAM trigger may occur after the CU trigger and before the relay node receives the fourth F1 interface establishment completion message. For example, the OAM trigger may occur after the relay node sends an F1 interface establishment message to the second host node and before the relay node receives an F1SETUP RESPONSE message from the second host node.

[0070] In a possible implementation manner, the fourth information further includes an identifier of the target host node and / or a triggering method for the DU migration.

[0071] In an embodiment of the present application, the identifier of the target host node may be, for example, a gNB ID and / or an IP address. The triggering method for DU migration may be, for example, a CU trigger. The fourth information carries the identifier of the target host node, which can facilitate OAM to know that the relay node has established an F1 interface with the target host node, and adjust the connection relationship of the relay node, so as to facilitate the subsequent management of the relay node and the execution of the next DU migration. The fourth information carries the DU migration triggering method, which allows OAM to know according to whose instructions the relay node has established the F1 interface. In a possible implementation, the identifier of the target host node carried in the fourth information can also be represented by the identifier of the target cell (such as: NR cell global identifier NCGI), and OAM can obtain the identifier of the target host node based on the identifier of the target cell.

[0072] In a possible implementation manner, the fourth information further includes an identifier of the target host node and / or a triggering method of the DU migration, including:

[0073] When the second trigger condition includes the relay node receiving the fifth information from the first host node and / or the sixth information provided by the network manager, the fourth information also includes the identifier of the target host node and / or the triggering method of the DU migration.

[0074] In the implementation manner of the present application, the relay node receives the fifth information from the first host node, which is equivalent to the first host node instructing the relay node to establish an F1 interface (CU trigger) with the target host node. Since in the implementation manner of the present application, in the case of a trigger conflict, the CU trigger shall prevail. Therefore, when a trigger conflict occurs and the indication information (fifth information) of the CU trigger is received, sending the fourth information to OAM enables OAM to update the connection relationship of the IAB node in a timely manner, which is convenient for subsequent management. Based on the sixth information provided by the network management, it is equivalent to a trigger conflict, and the indications of the CU trigger and the OAM trigger are different (for example, the target host node is different from the second host node). In this case, sending the fourth information to OAM can also enable OAM to update the connection relationship of the IAB node in a timely manner, which is convenient for subsequent management.

[0075] In a fourth aspect, an embodiment of the present application provides a communication method, which can be performed by a communication device. The communication device can be a device, or a chip (system) or circuit for a device, which is not limited in the embodiment of the present application. The method is applied to a network management, and includes:

[0076] The network manager receives fourth information from the relay node, where the fourth information includes a result of the relay node establishing a third F1 interface with the target host node.

[0077] For the introduction of the relay node, the first host node, the second host node, the target host node and the OAM server in the implementation manner of the present application, reference may be made to the relevant description of the first aspect or the second aspect, which will not be repeated here.

[0078] The fourth information in the implementation manner of the present application includes the result of the relay node and the target host node establishing the third F1 interface, which may be, for example, that the relay node and the target host node complete the establishment of the F1 interface, or that the relay node and the target host node do not complete the establishment of the F1 interface, etc., which is not limited in the implementation manner of the present application. Among them, the fourth information may carry an identifier of the target host node, such as a gNB ID and / or an IP address, or carry an identifier of the target cell, such as an NR cell global identifier NCGI.

[0079] Normally, the network manager will not receive the establishment result of the F1 interface returned by the relay node. After issuing the indication information, the network manager will default the relay node to perform DU migration according to the indication information, and the network manager will adjust the connection relationship of the relay node based on the indication information in the OAM trigger. For example, OAM instructs the relay node to establish an F1 interface with the second host node, then OAM will adjust the connection relationship of the relay node to establish an F1 interface between the relay node and the second host node. However, in the case of a conflict between the CU trigger and the OAM trigger, the relay node may not establish the F1 interface according to the indication information triggered by OAM, which will cause errors in the connection relationship recorded by OAM.

[0080] In one possible scenario, OAM instructs the relay node to establish an F1 interface with the second host node, but the relay node actually establishes an F1 interface with the target host node according to the instruction triggered by the CU. In this case, OAM may still believe that the relay node has established an F1 interface with the second host node and perform subsequent management operations. This may cause management anomalies because OAM records the incorrect connection relationship of the relay node.

[0081] In the implementation manner of the present application, the network management receives the fourth information indicating the result of the relay node establishing the first F1 interface with the target host node, so that the OAM can know that the relay node establishes the F1 interface with the target host node and adjust the connection relationship of the relay node, so as to facilitate the subsequent management of the relay node and the execution of the next DU migration.

[0082] In a possible implementation manner, the fourth information further includes an identifier of the target host node and / or a triggering method for the DU migration. The beneficial effects of this implementation manner can refer to the beneficial effects of the corresponding implementation manner in the third aspect, and will not be repeated here.

[0083] In a possible implementation manner, the fourth information further includes an identifier of the target host node and / or a triggering method of the DU migration, including:

[0084] In the case where the second trigger condition includes the relay node receiving the fifth information from the first host node and / or the sixth information provided based on the network management, the fourth information also includes the identifier of the target host node and / or the triggering method of the DU migration. The beneficial effects of this implementation can refer to the beneficial effects of the corresponding implementation in the third aspect, which will not be repeated here.

[0085] In a fifth aspect, an embodiment of the present application provides a communication method, which can be performed by a communication device. The communication device can be a device, or a chip (system) or circuit for a device, which is not limited in the embodiment of the present application. The method is applied to a relay node, including:

[0086] The relay node receives the eighth information from the first host node, and sends the ninth information to the first host node; the eighth information is used to instruct the relay node to perform DU migration, and the ninth information is used to instruct the relay node to refuse to perform the DU migration.

[0087] The relay node, the first host node, the second host node, the target host node and the OAM server in the implementation manner of the present application can refer to the description corresponding to the first aspect or the second aspect above, which will not be repeated here.

[0088] The embodiment of the present application provides a communication method, when the relay node receives the indication information (eighth information) triggered by the CU, it sends information to the first host node for indicating the refusal to perform DU migration. Since the relay node will not perform the action indicated by the CU trigger, there will be no conflict between the CU trigger and the OAM trigger, thus avoiding the abnormal phenomenon that may be caused by the trigger conflict and ensuring that the relay node can successfully complete the DU migration.

[0089] Optionally, the eighth information in the implementation manner of the present application is used to instruct the relay node to perform DU migration, and may include an identifier of the host node after migration, such as a gNB ID and / or an IP address, etc. The ninth information is used to instruct the relay node to refuse to perform the DU migration indicated by the CU trigger, and is used to let the first host node know that the relay node did not perform DU migration according to its own instructions. Both the eighth information and the ninth information can be carried in the F1AP message.

[0090] In the IAB network, the DU migration of the IAB node supports two triggering modes: CU triggering and OAM triggering. In the CU triggering mode, the source CU will send an indication message carrying the target CU to the DU in the IAB node, and the DU will complete the migration operation based on the indication message. The source CU is the CU connected to the DU before the migration, and the target CU is the CU connected to the DU after the migration. In the OAM triggering mode, the OAM server can be directly pre-configured in the IAB node or remotely trigger the IAB node to perform DU migration. Obviously, both CU triggering and OAM triggering can instruct the relay node to perform DU migration. If the CU triggering and OAM triggering occur at the same time, the relay node may not be able to complete the DU migration normally, or may migrate to the wrong host node. In addition, in the case of a conflict between the two triggers, at least one trigger indication (such as an OAM trigger) is not completed, which may also cause abnormalities such as control failure and information transmission errors.

[0091] In the implementation manner of the present application, when the relay node receives the indication information triggered by the CU, it directly gives the indication information of refusing to migrate, so that the relay node can only perform the DU migration operation based on the indication information triggered by the OAM, thereby avoiding the conflict between the DU trigger and the OAM trigger.

[0092] In a possible implementation manner, the ninth information includes the reason why the relay node refuses to perform the DU migration.

[0093] In the implementation manner of the present application, the reason for refusing to perform DU migration may be, for example, that the relay node only accepts OAM triggering, or that the relay node does not support CU triggering, etc., and the implementation manner of the present application does not limit this. By giving the reason for refusing to perform DU migration, the first relay node can also know the specific reason for refusing to perform DU migration this time and record it. On the one hand, it can avoid the first host node instructing the relay node to perform DU migration again. On the other hand, it can also allow the first host node to understand the situation of the relay node more clearly. The relay node refuses to perform DU migration because it does not support CU triggering or only supports OAM triggering. Instead of the relay node refusing to perform DU migration for some reason, such as an abnormality in the relay node itself, or the relay node is temporarily unable to perform DU migration, etc.

[0094] Optionally, the ninth information can be carried in the class 1RESPONSE message or REJECT / FAILURE message of the F1AP message triggered by the CU, or in a separate class 2 message. Among them, the processes in the F1AP message are divided into class 1 and class 2. The class 1 process refers to the situation where feedback is required in the same process, such as: F1 SETUP REQEUST--F1 SETUP RESPONSE / F1 SETUP FAILURE, GNB-DU CONFIGURATION UPDATE--GNB-DU CONFIGURATION UPDATE ACK / GNB-DU CONFIGURATION UPDATE FAILURE, etc., while the class 2 process refers to the process with only one message in the process and does not require feedback of the F1AP message, such as: UL RRCMESSAGE TRANSFER, DL RRC MESSAGE TRANSFER, etc.

[0095] In a possible implementation manner, the trigger condition for sending the ninth information is receiving the eighth information. After receiving the eighth information, the IAB node determines that the trigger of the source CU is not accepted, and immediately replies with the ninth information.

[0096] In a sixth aspect, an embodiment of the present application provides a communication method, which can be performed by a communication device. The communication device can be a device, or a chip (system) or circuit for a device, etc., which is not limited in the embodiment of the present application. The method is applied to a first host node, including:

[0097] The first host node sends eighth information to the relay node, and receives ninth information from the relay node; the eighth information is used to instruct the relay node to perform DU migration, and the ninth information is used to instruct the relay node to refuse to perform the DU migration.

[0098] The relay node, the first host node, the second host node, the target host node and the OAM server in the implementation manner of the present application can refer to the description corresponding to the first aspect or the second aspect above, which will not be repeated here.

[0099] The embodiment of the present application provides a communication method, in which the first host node sends a CU-triggered indication message (eighth message) to the relay node, and the first host node receives an indication message (ninth message) for indicating rejection of the CU trigger. Since the relay node refuses to execute the action indicated by the CU trigger, there will be no conflict between the CU trigger and the OAM trigger, thus avoiding abnormal phenomena that may be caused by the trigger conflict and ensuring that the relay node can successfully complete the DU migration.

[0100] The eighth information in the implementation manner of the present application is used to instruct the relay node to perform DU migration, and may include an identifier of the host node after migration, such as a gNB ID and / or an IP address, etc. The ninth information is used to instruct the relay node to refuse to perform the DU migration indicated by the CU trigger, and is used to let the first host node know that the relay node did not perform DU migration according to its own instructions. Both the eighth information and the ninth information can be carried in the F1AP message.

[0101] In the IAB network, the DU migration of the IAB node supports two triggering modes: CU triggering and OAM triggering. In the CU triggering mode, the source CU will send an indication message carrying the target CU to the DU in the IAB node, and the DU will complete the migration operation based on the indication message. The source CU is the CU connected to the DU before the migration, and the target CU is the CU connected to the DU after the migration. In the OAM triggering mode, the OAM server can be directly pre-configured in the IAB node or remotely trigger the IAB node to perform DU migration. Obviously, both CU triggering and OAM triggering can instruct the relay node to perform DU migration. If the CU triggering and OAM triggering occur at the same time, the relay node may not be able to complete the DU migration normally, or may migrate to the wrong host node. In addition, in the case of a conflict between the two triggers, at least one trigger indication (such as an OAM trigger) is not completed, which may also cause abnormalities such as control failure and information transmission errors.

[0102] In the implementation manner of the present application, when the relay node receives the indication information triggered by the CU, it directly gives the indication information of refusing to migrate, so that the relay node can only perform the DU migration operation based on the indication information triggered by the OAM, thereby avoiding the conflict between the DU trigger and the OAM trigger.

[0103] In a possible implementation manner, the eighth information includes the reason why the relay node refuses to perform the DU migration.

[0104] The beneficial effects of this implementation can refer to the beneficial effects of the corresponding implementation in the fifth aspect, and will not be repeated here.

[0105] In a seventh aspect, an embodiment of the present application provides a communication method, which can be performed by a communication device. The communication device can be a device, or a chip (system) or circuit for a device, etc., which is not limited in the embodiment of the present application. The method is applied to a relay node, including:

[0106] The relay node receives tenth information from the network management, where the tenth information is used to instruct the relay node to perform DU migration;

[0107] The DU ignores the tenth information.

[0108] In an implementation manner of the present application, a communication method is provided, in which, when a relay node receives an indication message (the tenth message) triggered by OAM, the indication message triggered by OAM is ignored (equivalent to not executing OAM triggering). Thus, the relay node will only perform DU migration based on the indication message triggered by CU, thereby avoiding conflicts when CU triggering and OAM triggering occur at the same time, and ensuring that the relay node can normally complete DU migration.

[0109] For the introduction of the relay node, the first host node, the second host node, the target host node and the OAM in the implementation manner of the present application, reference may be made to the relevant description in the first aspect or the second aspect above, and no further details will be given here.

[0110] Among them, the tenth information may be information pre-configured by the network manager on the relay node, or information sent by the network manager to the relay node through remote control. For the introduction of pre-configuration and remote control, please refer to the above description, which will not be repeated here. The tenth information may include the identifier of the host node after the relay node is migrated, for example, the gNB ID and / or IP address, etc. The tenth information may also include information such as the time when the relay node performs DU migration.

[0111] Among them, DU ignores (ignores) the tenth information, which may be that the relay node refuses to receive the pre-configuration information of the network manager; it may also be that when the relay node is pre-configured by the network manager, the pre-configuration information is deleted; it may also be that when the pre-configuration information indicates that the relay node needs to migrate, the relay node ignores the instruction and does not perform DU migration according to the instruction of the pre-configuration information; it may also be that the DU migration triggered by the network manager through remote control is ignored. In one possible implementation, the trigger condition for ignoring the tenth information is the receipt of the tenth information. When the relay node receives the tenth information, even if no CU configures other target host node information, it directly ignores the tenth information.

[0112] In the IAB network, the DU migration of the IAB node supports two triggering modes: source CU triggering and OAM triggering. In the source CU triggering (hereinafter referred to as "CU triggering") mode, the source CU will send an indication message carrying the target CU to the DU in the IAB node, and the DU will complete the migration operation based on the indication message. The source CU is the CU connected to the DU before the migration, and the target CU is the CU connected to the DU after the migration. In the OAM triggering mode, the OAM server can be directly pre-configured in the IAB node or remotely trigger the IAB node to perform DU migration. Obviously, both CU triggering and OAM triggering can instruct the relay node to perform DU migration. If the CU triggering and OAM triggering occur at the same time, the relay node may not be able to complete the DU migration normally, or may migrate to the wrong host node. In addition, in the case of a conflict between the two triggers, at least one trigger indication (such as CU triggering) is not completed, which may also cause abnormalities such as control failure and information transmission errors.

[0113] In the implementation manner of the present application, when the OAM-triggered indication information instructs the relay node to perform DU migration, the relay node ignores the OAM-triggered indication information, so that the relay node only executes the CU-triggered indication information, thereby avoiding the conflict between CU triggering and OAM triggering, and then ensuring that the relay node completes the DU migration normally.

[0114] In a possible implementation manner, the relay node sends eleventh information to the network manager, where the eleventh information is used to indicate rejection of DU migration triggered by the network manager or to indicate that the network manager does not trigger DU migration of the relay node.

[0115] In the implementation manner of the present application, after the relay node receives the indication information of the OAM trigger, on the one hand, it will ignore the indication information of the OAM trigger and will not execute the DU migration indicated by the OAM trigger. On the other hand, the relay node will also send an eleventh message to the network management (OAM server) to indicate the rejection of the OAM trigger or to instruct the OAM server to no longer trigger the DU migration of the relay node. The OAM server knows that the DU migration indicated by it is not executed by the relay node, thereby avoiding the OAM server from adjusting the connection relationship of the relay node according to the indication information of the OAM trigger. Informing the OAM server not to trigger the DU migration can also save some control resources and avoid the conflict between the OAM trigger and the CU trigger again.

[0116] Optionally, the relay node sends indication information to the OAM server, where the indication information is used to instruct the relay node to establish an F1 interface with the target host node.

[0117] When the relay node ignores the indication information triggered by OAM, if it performs DU migration according to the indication information triggered by CU and informs the OAM server of the relay node DU migration, the OAM server can update the connection relationship of the relay node in time, thereby facilitating the OAM server to perform subsequent management of the relay node.

[0118] In a possible implementation, the trigger condition for sending the eleventh information is receiving the tenth information. After receiving the tenth information, even if no source CU configures other target host node information, the relay node determines not to accept the OAM trigger and immediately replies with the eleventh information.

[0119] In an eighth aspect, an embodiment of the present application provides a communication method, which can be performed by a communication device. The communication device can be a device, or a chip (system) or circuit for a device, etc., which is not limited in the embodiment of the present application. The method is applied to a network management, including:

[0120] The network management sends tenth information to the relay node, where the tenth information is used to instruct the relay node to perform DU migration;

[0121] The network manager receives eleventh information from the relay node, where the eleventh information is used to indicate rejection of DU migration triggered by the network manager or to indicate that the network manager does not trigger DU migration of the relay node.

[0122] In an embodiment of the present application, a communication method is provided, after the network management sends the indication information (the tenth information) of OAM triggering to the relay node, the eleventh information is received from the relay node, and the information is used to instruct the relay node to refuse to execute the indication information triggered by OAM, or the information is used to instruct the network management to no longer trigger the DU migration of the relay node. The relay node will only perform DU migration based on the indication information triggered by CU, thereby avoiding conflicts when CU triggering and OAM triggering occur at the same time, and ensuring that the relay node can normally complete DU migration.

[0123] For the introduction of the relay node, the first host node, the second host node, the target host node and the OAM in the implementation manner of the present application, reference may be made to the relevant description in the first aspect or the second aspect above, and no further details will be given here.

[0124] Among them, the tenth information may be information pre-configured by the network manager on the relay node, or information sent by the network manager to the relay node through remote control. For the introduction of pre-configuration and remote control, please refer to the above description, which will not be repeated here. The tenth information may include the identifier of the host node after the relay node is migrated, for example, the gNB ID and / or IP address, etc. The tenth information may also include information such as the time when the relay node performs DU migration.

[0125] The eleventh information may be sent to the relay node through a PDU session between the IAB-MT and the core network, for example.

[0126] In the IAB network, the DU migration of the IAB node supports two triggering modes: source CU triggering and OAM triggering. In the source CU triggering (hereinafter referred to as "CU triggering") mode, the source CU will send an indication message carrying the target CU to the DU in the IAB node, and the DU will complete the migration operation based on the indication message. The source CU is the CU connected to the DU before the migration, and the target CU is the CU connected to the DU after the migration. In the OAM triggering mode, the OAM server can be directly pre-configured in the IAB node or remotely trigger the IAB node to perform DU migration. Obviously, both CU triggering and OAM triggering can instruct the relay node to perform DU migration. If the CU triggering and OAM triggering occur at the same time, the relay node may not be able to complete the DU migration normally, or may migrate to the wrong host node. In addition, in the case of a conflict between the two triggers, at least one trigger indication (such as CU triggering) is not completed, which may also cause abnormalities such as control failure and information transmission errors.

[0127] In the implementation mode of the present application, the network management (OAM server) will receive the eleventh information sent by the relay node, which is used to indicate the rejection of OAM triggering or to indicate that the OAM server no longer triggers the DU migration of the relay node. The OAM server knows that the DU migration indicated by it is not executed by the relay node, thereby avoiding the OAM server from adjusting the connection relationship of the relay node according to the indication information of the OAM trigger. Informing the OAM server not to trigger DU migration can also save some control resources and avoid the conflict between OAM triggering and CU triggering again.

[0128] In a possible implementation manner, the relay node sends eleventh information to the network manager, where the eleventh information is used to indicate rejection of DU migration triggered by the network manager or to indicate that the network manager does not trigger DU migration of the relay node.

[0129] In the implementation manner of the present application, after the relay node receives the indication information of the OAM trigger, on the one hand, it will ignore the indication information of the OAM trigger and will not execute the DU migration indicated by the OAM trigger. On the other hand, the relay node will also send an eleventh message to the network management (OAM server) to indicate the rejection of the OAM trigger or to instruct the OAM server to no longer trigger the DU migration of the relay node. The OAM server knows that the DU migration indicated by it is not executed by the relay node, thereby avoiding the OAM server from adjusting the connection relationship of the relay node according to the indication information of the OAM trigger. Informing the OAM server not to trigger the DU migration can also save some control resources and avoid the conflict between the OAM trigger and the CU trigger again.

[0130] Optionally, the relay node sends indication information to the OAM server, where the indication information is used to instruct the relay node to establish an F1 interface with the target host node.

[0131] When the relay node ignores the indication information triggered by OAM, if it performs DU migration according to the indication information triggered by CU and informs the OAM server of the relay node DU migration, the OAM server can update the connection relationship of the relay node in time, thereby facilitating the OAM server to perform subsequent management of the relay node.

[0132] In a ninth aspect, an embodiment of the present application provides a communication method, which can be performed by a communication device. The communication device can be a device, or a chip (system) or circuit for a device, which is not limited in the present application. The method is applied to a relay node, including:

[0133] The relay node sends twelfth information to the first host node;

[0134] The twelfth information is used to indicate the triggering method of DU migration supported by the relay node; and / or the relay node receives the thirteenth information from the first host node, and the thirteenth information is used to indicate the triggering method of DU migration supported by the relay node; the triggering method includes CU triggering and / or network management triggering.

[0135] In an embodiment of the present application, a communication method is provided, wherein a relay node sends twelfth information to a first host node, and the twelfth information is used to indicate a triggering method of DU migration supported by the relay node. And / or the relay node receives thirteenth information from the first host node when a third condition is met, and the thirteenth information is used to indicate a triggering method of DU migration supported by the relay node. The relay node and the first host node can know the triggering method of DU migration supported by the relay node, thereby reducing the possibility of triggering conflicts.

[0136] For the introduction of the relay node, the first host node, the second host node, the target host node and the OAM server in the embodiment of the present application, reference may be made to the relevant description of the first aspect or the second aspect mentioned above, which will not be repeated here.

[0137] The twelfth information and the thirteenth information in the embodiment of the present application are both used to indicate the triggering mode of DU migration supported by the relay node, for example, only supporting CU triggering, only supporting OAM triggering, or supporting both CU triggering and OAM triggering. In the case where the relay node supports both CU triggering and OAM triggering, the priority of CU triggering and OAM triggering can also be set, for example, OAM triggering is used as the basis (equivalent to the first and second aspects), or CU triggering is used as the basis (equivalent to the third and fourth aspects).

[0138] The twelfth information may be carried in the class 1 process of F1AP, for example, in the F1 SETUP REQUEST message or the GNB-DU CONFIGURATION UPDATE message. It may also be carried in the class 2 process of F1AP, and the specific message used is not limited in the embodiment of the present application.

[0139] The thirteenth information may be carried in the class 1 process of F1AP, for example, in the F1 SETUP RESPONSE message or the GNB-CU CONFIGURATION UPDATE message. It may also be carried in the class 2 process of F1AP, and the specific message used is not limited in the embodiment of the present application.

[0140] In a possible implementation manner, the relay node sends the twelfth information to the first host node, including:

[0141] When a third trigger condition is met, the relay node sends the twelfth information to the first host node;

[0142] The third trigger condition includes at least one of the following:

[0143] The relay node completes network access; or, the relay node completes DU migration.

[0144] The third trigger condition in the embodiment of the present application includes but is not limited to: the relay node completes the network access or the relay node completes the DU migration. It can be understood that the completion of the relay node entering the network usually means that the parent node of the relay node is already in the network, and the relay node and the host node in the network complete the establishment of the F1 interface. Alternatively, the relay node can provide services for the UE or the next hop MT. The relay node completes the DU migration, which may be that the relay node has established a new F1 interface with a new host node, and the UE of the relay node has switched to the new DU and released the old F1 interface. For example, the relay node maintains an F1 interface connection with the first host node before the DU migration, and has an F1 interface connection with the target host node after the DU migration. The relay node creates two logical DUs during the DU migration process, namely DU1 and DU2. Before the DU migration, the UE is in the cell corresponding to DU1, and after the DU migration, the UE is in the cell corresponding to DU2. Before the DU migration, DU1 has an F1 interface with the first host node, and after the DU migration, the F1 interface between DU1 and the first host node is released, and DU2 completes the establishment of the F1 interface with the target host node.

[0145] It can be understood that when the third trigger condition is met, the relay node generates the twelfth information, and the third trigger condition at this time can be understood as a condition that triggers the relay node to generate the twelfth information. Optionally, when the third trigger condition is met, the relay node will also send the twelfth information, and the third trigger condition at this time can be understood as a condition that triggers the relay node to generate and send the twelfth information.

[0146] In an implementation manner of the present application, when the relay node completes network access or the relay node completes DU migration, a twelfth information is sent to the first host node to indicate the triggering method of DU migration supported by the relay node, so that the relay node and the first host node can know the triggering method of DU migration supported by the relay node, thereby reducing the possibility of triggering conflicts when the relay node performs DU migration again.

[0147] In a tenth aspect, an embodiment of the present application provides a communication method, which can be performed by a communication device. The communication device can be a device, or a chip (system) or circuit for a device, which is not limited in the present application. The method is applied to a first host node, including:

[0148] The first host node sends thirteenth information to the relay node;

[0149] The thirteenth information is used to indicate the triggering method of DU migration supported by the relay node; and / or, the first host node receives the twelfth information from the relay node, and the twelfth information is used to indicate the triggering method of DU migration supported by the relay node; the triggering method includes CU triggering and / or network management triggering.

[0150] The twelfth information and the thirteenth information in the implementation manner of this application can refer to the relevant introduction of the ninth aspect and will not be repeated here.

[0151] The relay node, the first host node, the second host node, the target host node and the OAM server in the implementation manner of the present application can refer to the relevant description of the first aspect or the second aspect, which will not be repeated here.

[0152] In the implementation manner of the present application, the above-mentioned triggering method includes CU triggering and / or network management triggering. In the case where the above-mentioned triggering method only includes CU triggering or only includes network management triggering, it can enable the relay node to avoid triggering conflicts and ensure that the relay node completes DU migration normally. If the above-mentioned triggering method includes both CU triggering and OAM triggering, the possible conflicts can be handled by the method provided in the first aspect, the second aspect, the third aspect or the fourth aspect to ensure that the relay node completes DU migration normally.

[0153] The beneficial effects of the embodiments of the present application can be referred to the effective effects of the corresponding implementation methods in the ninth aspect, and will not be repeated here.

[0154] In a possible implementation manner, the first host node sends the thirteenth information to the relay node, including:

[0155] When the third trigger condition is met, the first host node sends thirteenth information to the relay node;

[0156] The third trigger condition includes at least one of the following:

[0157] The relay node completes network access; or, the relay node completes DU migration.

[0158] The third trigger condition in the implementation manner of the present application can refer to the relevant introduction of the ninth aspect and will not be repeated here.

[0159] In an implementation manner of the present application, when the relay node completes network access or the relay node completes DU migration, the first host node sends the thirteenth information to the relay master node, which is used to indicate the triggering method of DU migration supported by the relay node, so that the relay node and the first host node know the triggering method of DU migration supported by the relay node, thereby reducing the possibility of triggering conflicts when the relay node performs DU migration again.

[0160] In an eleventh aspect, an embodiment of the present application provides a communication method, which can be performed by a communication device. The communication device can be a device, or a chip (system) or circuit for a device, which is not limited in the present application. The method is applied to a first host node, including:

[0161] When the fourth trigger condition is met, the first host node sends fourteenth information to the second host node; the fourteenth information is used to indicate cancellation of establishing the F1 interface between the second host node and the relay node;

[0162] Wherein, the fourth trigger condition includes:

[0163] The fifteenth information is received from the relay node, wherein the fifteenth information includes that the relay node completes the establishment of an F1 interface with a target host node, and the target host node is different from the second host node.

[0164] In an embodiment of the present application, a communication method is provided, in which the first host node sends a fourteenth message to the second host node when the fourth trigger condition is met, and the fourteenth message is used to indicate the cancellation of the establishment of the F1 interface between the second host node and the relay node, so as to avoid the abnormal situation caused by the second host node trying to establish the F1 interface with the relay node again. In addition, the second host node can also use effective resources to establish the F1 interface with other relay nodes.

[0165] The relay node, the first host node, the second host node, the target host node and the OAM server in the implementation manner of the present application can refer to the relevant description of the first aspect and the second aspect mentioned above, which will not be repeated here.

[0166] The fourth trigger condition in the embodiment of the present application includes, but is not limited to, the first host node receiving the fifteenth information from the relay node, the fifteenth information being used to indicate that the relay node has completed the establishment of the F1 interface with the target host node, and the target host node is different from the second host node. The fifteenth information may be carried in an F1AP message. The message may carry an identifier of the target host node, such as a gNB ID and / or an IP address.

[0167] The fourteenth information in the embodiment of the present application may be information sent by the first host node to the second host node through the Xn interface. The message may carry an identifier of the target host node, such as a gNB ID and / or an IP address.

[0168] It can be understood that when the fourth trigger condition is met, the first host node generates the fourteenth information, and the fourth trigger condition at this time can be understood as a condition that triggers the first host node to generate the fourteenth information. Optionally, when the fourth trigger condition is met, the relay node will also send the fourteenth information, and the fourth trigger condition at this time can be understood as a condition that triggers the relay node to generate and send the fourteenth information.

[0169] In a twelfth aspect, an embodiment of the present application provides a communication method, which can be performed by a communication device. The communication device can be a device, or a chip (system) or circuit for a device, which is not limited in the present application. The method is applied to a second host node, including:

[0170] The second host node receives fourteenth information from the first host node, where the fourteenth information is used to indicate to cancel establishing the F1 interface between the second host node and the relay node.

[0171] In an embodiment of the present application, a communication method is provided, wherein a second host node receives fourteenth information from a first host node, wherein the fourteenth information is used to indicate cancellation of establishment of an F1 interface between the second host node and a relay node, thereby avoiding an abnormal situation caused by the second host node attempting to establish an F1 interface with the relay node again. In addition, the second host node can also use effective resources to establish an F1 interface with other relay nodes.

[0172] The relay node, the first host node, the second host node, the target host node and the OAM server in the implementation manner of the present application can refer to the relevant description of the first aspect and the second aspect mentioned above, which will not be repeated here.

[0173] The fourteenth information in the embodiment of the present application may be information received by the second host node from the first host node through the Xn interface. The message may carry an identifier of the target host node, such as a gNB ID and / or an IP address.

[0174] In a thirteenth aspect, an embodiment of the present application provides a communication device, which includes a unit for executing any method as described in the first aspect.

[0175] In one possible design, the apparatus includes:

[0176] A processing unit, configured to generate first information when a first trigger condition is met; the first information includes a result of the relay node establishing a first F1 interface with a target host node and an identifier of the target host node; or, the first information includes a result of the relay node establishing a first F1 interface with a target host node, an identifier of the target host node, and a triggering method for DU migration of the relay node;

[0177] The first trigger condition includes at least one of the following:

[0178] Based on second information provided by the network management, the second information is used to instruct the relay node to establish the first F1 interface with the target host node; or, the relay node receives third information from the first host node, and the third information is used to instruct the relay node to establish a second F1 interface with a second host node, and the second host node is different from the target host node.

[0179] In a possible implementation, the device further includes:

[0180] A communication unit is used to send the first information.

[0181] The method executed by the above-mentioned processing unit and communication unit can refer to the method corresponding to the above-mentioned first aspect, which will not be repeated here.

[0182] Regarding the beneficial effects brought about by the thirteenth aspect and any possible implementation manner, reference may be made to the description of the beneficial effects corresponding to the first aspect and the corresponding implementation manner, which will not be repeated here.

[0183] In a fourteenth aspect, an embodiment of the present application provides a communication device, which includes a unit for executing any method as described in the second aspect.

[0184] In one possible design, the apparatus includes:

[0185] Communication unit,

[0186] When the first trigger condition is met, the first host node receives first information from the relay node; the first information includes a result of the relay node establishing the first F1 interface with the target host node and an identifier of the target host node; or, the first information includes a result of the relay node establishing the first F1 interface with the target host node, an identifier of the target host node, and a triggering method for DU migration of the relay node;

[0187] The first trigger condition includes at least one of the following:

[0188] Based on second information provided by the network management, the second information is used to instruct the relay node to establish the first F1 interface with the target host node; or, the relay node receives third information from the first host node, and the third information is used to instruct the relay node to establish a second F1 interface with a second host node, and the second host node is different from the target host node.

[0189] In a possible implementation, the device further includes:

[0190] A processing unit is used to process the first information.

[0191] The method performed by the above-mentioned communication unit and processing unit can refer to the method corresponding to the above-mentioned second aspect, which will not be repeated here.

[0192] Regarding the beneficial effects brought about by the fourteenth aspect and any possible implementation manner, reference may be made to the description of the beneficial effects corresponding to the second aspect and the corresponding implementation manner, which will not be repeated here.

[0193] In a fifteenth aspect, an embodiment of the present application provides a communication device, which includes a unit for executing any method as described in the third aspect.

[0194] In one possible design, the apparatus includes:

[0195] The processing unit is used to generate fourth information; the fourth information includes the result of the relay node establishing the third F1 interface with the target host node.

[0196] In one possible implementation, the device further includes:

[0197] A communication unit is used to send the fourth information to the network management.

[0198] In a possible implementation manner, the processing unit is specifically configured to generate the fourth information when the second trigger condition is met;

[0199] The second trigger condition includes at least one of the following:

[0200] The relay node receives fifth information from the first host node, and the fifth information is used to instruct the relay node to establish the third F1 interface with the target host node; or, based on sixth information provided by the network management, the sixth information is used to instruct the relay node to establish a fourth F1 interface with the second host node, and the second host node is different from the target host node; or, the relay node receives seventh information from the target host node, and the seventh information is used to indicate that the establishment of the third F1 interface is completed.

[0201] In a possible implementation manner, the communication unit is specifically configured to send the fourth information to the network manager when the second trigger condition is met.

[0202] The method executed by the above-mentioned processing unit and communication unit can refer to the method corresponding to the above-mentioned third aspect, which will not be repeated here.

[0203] Regarding the beneficial effects brought about by the fifteenth aspect and any possible implementation method, reference may be made to the description of the beneficial effects corresponding to the third aspect and the corresponding implementation methods, which will not be repeated here.

[0204] In the sixteenth aspect, an embodiment of the present application provides a communication device, which includes a unit for executing any method as described in the fourth aspect.

[0205] In one possible design, the apparatus includes:

[0206] The communication unit is configured to receive fourth information from the relay node, where the fourth information includes a result of the relay node establishing a third F1 interface with the target host node.

[0207] In a possible implementation, the device further includes:

[0208] A processing unit is used to process the fourth information.

[0209] The method executed by the above-mentioned processing unit and communication unit can refer to the method corresponding to the above-mentioned fourth aspect, which will not be repeated here.

[0210] Regarding the beneficial effects brought about by the sixteenth aspect and any possible implementation manner, reference may be made to the description of the beneficial effects corresponding to the fourth aspect and the corresponding implementation manner, which will not be repeated here.

[0211] In the seventeenth aspect, an embodiment of the present application provides a communication device, which includes a unit for executing any method as described in the fifth aspect.

[0212] In one possible design, the apparatus includes:

[0213] The communication unit is used to receive eighth information from the first host node, where the eighth information is used to instruct the relay node to perform DU migration.

[0214] In a possible implementation manner, the device further includes:

[0215] The processing unit is used to generate ninth information, where the ninth information is used to instruct the relay node to refuse to perform the DU migration.

[0216] In a possible implementation, the communication unit is further configured to send ninth information to the first host node.

[0217] The method executed by the above-mentioned processing unit and communication unit can refer to the method corresponding to the above-mentioned fifth aspect, which will not be repeated here.

[0218] Regarding the beneficial effects brought about by the seventeenth aspect and any possible implementation manner, reference may be made to the description of the beneficial effects corresponding to the fifth aspect and the corresponding implementation manner, which will not be repeated here.

[0219] In the eighteenth aspect, an embodiment of the present application provides a communication device, which includes a unit for executing any method as described in the sixth aspect.

[0220] In one possible design, the apparatus includes:

[0221] The processing unit is used to generate eighth information, where the eighth information is used to instruct the relay node to perform DU migration.

[0222] In a possible implementation manner, the device further includes:

[0223] The communication unit is used to send the eighth information to the relay node.

[0224] In a possible implementation manner, the communication unit is further configured to receive ninth information from the relay node, where the ninth information is configured to instruct the relay node to refuse to perform the DU migration.

[0225] The method executed by the above-mentioned processing unit and communication unit can refer to the method corresponding to the above-mentioned sixth aspect, which will not be repeated here.

[0226] Regarding the beneficial effects brought about by the eighteenth aspect and any possible implementation manner, reference may be made to the description of the beneficial effects of the sixth aspect and the corresponding implementation manner, which will not be repeated here.

[0227] In the nineteenth aspect, an embodiment of the present application provides a communication device, which includes a unit for executing any method as described in the seventh aspect.

[0228] In one possible design, the apparatus includes:

[0229] The communication unit is used to receive tenth information from the network management, where the tenth information is used to instruct the relay node to perform DU migration.

[0230] In a possible implementation, the device further includes:

[0231] The processing unit is configured to process the tenth information. For example, the tenth information is ignored.

[0232] The methods executed by the above-mentioned processing unit and communication unit can refer to the methods corresponding to the above-mentioned seventh aspect, which will not be repeated here.

[0233] Regarding the beneficial effects brought about by the nineteenth aspect and any possible implementation manner, reference may be made to the description of the beneficial effects corresponding to the seventh aspect and the corresponding implementation manner, which will not be repeated here.

[0234] In the twentieth aspect, an embodiment of the present application provides a communication device, which includes a unit for executing any method as described in the eighth aspect.

[0235] In one possible design, the apparatus includes:

[0236] a processing unit, configured to generate tenth information, wherein the tenth information is used to instruct the relay node to perform DU migration;

[0237] In a possible implementation, the device further includes:

[0238] The communication unit is used to send tenth information to the relay node.

[0239] In a possible implementation, the communication unit is further used to receive eleventh information from the relay node, and the eleventh information is used to indicate rejection of the DU migration triggered by the network manager or to indicate that the network manager does not trigger the DU migration of the relay node.

[0240] The methods executed by the above-mentioned processing unit and communication unit can refer to the methods corresponding to the above-mentioned eighth aspect, which will not be repeated here.

[0241] Regarding the beneficial effects brought about by the twentieth aspect and any possible implementation manner, reference may be made to the description of the beneficial effects corresponding to the eighth aspect and the corresponding implementation manner, which will not be repeated here.

[0242] In the twenty-first aspect, an embodiment of the present application provides a communication device, which includes a unit for executing any method as described in the ninth aspect.

[0243] In one possible design, the apparatus includes:

[0244] A processing unit, configured to generate twelve information, wherein the twelfth information is used to indicate a triggering method of DU migration supported by the relay node; and / or, to process thirteenth information from the first host node, wherein the thirteenth information is used to indicate a triggering method of DU migration supported by the relay node;

[0245] In a possible implementation, the device further includes:

[0246] A communication unit is used to send the twelfth information and / or receive the thirteenth information.

[0247] The methods executed by the above-mentioned processing unit and communication unit can refer to the methods corresponding to the above-mentioned ninth aspect, which will not be repeated here.

[0248] Regarding the beneficial effects brought about by the twenty-first aspect and any possible implementation manner, reference may be made to the description of the beneficial effects of the ninth aspect and the corresponding implementation manner, which will not be repeated here.

[0249] In the twenty-second aspect, an embodiment of the present application provides a communication device, which includes an or unit for executing any method as in the tenth aspect.

[0250] In one possible design, the apparatus includes:

[0251] A processing unit, configured to generate thirteen information, wherein the thirteenth information is used to indicate a triggering method of DU migration supported by the relay node; and / or, to process twelfth information from the relay node, wherein the twelfth information is used to indicate a triggering method of DU migration supported by the relay node;

[0252] The third trigger condition includes at least one of the following:

[0253] The relay node completes network access; or, the relay node completes DU migration.

[0254] In a possible implementation, the device further includes:

[0255] A communication unit is used to send the thirteenth information and / or receive the twelfth information.

[0256] The methods executed by the above-mentioned processing unit and communication unit can refer to the methods corresponding to the above-mentioned tenth aspect, which will not be repeated here.

[0257] Regarding the beneficial effects brought about by the twenty-second aspect and any possible implementation manner, reference may be made to the description of the beneficial effects corresponding to the tenth aspect and the corresponding implementation manner, which will not be repeated here.

[0258] In the twenty-third aspect, an embodiment of the present application provides a communication device, which includes a unit for executing any method as described in the eleventh aspect.

[0259] In one possible design, the apparatus includes:

[0260] A processing unit, configured to generate fourteenth information when the fourth trigger condition is met; the fourteenth information is used to indicate cancellation of establishing the F1 interface between the second host node and the relay node;

[0261] Wherein, the fourth trigger condition includes:

[0262] The fifteenth information is received from the relay node, wherein the fifteenth information includes that the relay node completes the establishment of an F1 interface with a target host node, and the target host node is different from the second host node.

[0263] In a possible implementation, the device further includes:

[0264] a communication unit, configured to send fourteenth information when a fourth trigger condition is met;

[0265] The methods executed by the above-mentioned processing unit and communication unit can refer to the methods corresponding to the above-mentioned eleventh aspect, which will not be repeated here.

[0266] Regarding the beneficial effects brought about by the twenty-third aspect and any possible implementation manner, reference may be made to the description of the beneficial effects corresponding to the eleventh aspect and the corresponding implementation manner, which will not be repeated here.

[0267] In aspect 24, an embodiment of the present application provides a communication device, which includes a unit for executing any method as described in aspect 12.

[0268] In one possible design, the apparatus includes:

[0269] The communication unit is used to receive fourteenth information from the first host node, where the fourteenth information is used to instruct to cancel the establishment of the F1 interface between the second host node and the relay node.

[0270] In a possible implementation, the device further includes:

[0271] A processing unit is used to process the fourteenth information.

[0272] The methods executed by the above-mentioned processing unit and communication unit can refer to the methods corresponding to the above-mentioned aspect 12, which will not be repeated here.

[0273] Regarding the beneficial effects brought about by the twenty-fourth aspect and any possible implementation manner, reference may be made to the description of the beneficial effects of the twelfth aspect and the corresponding implementation manner, which will not be repeated here.

[0274] Optionally, in the communication device described in any one of the thirteenth to twenty-fourth aspects and any possible implementation manner:

[0275] In one implementation, the communication device is a communication device. When the communication device is a communication device, the communication unit may be a transceiver, or an input / output interface; the processing unit may be at least one processor. Optionally, the transceiver may be a transceiver circuit. Optionally, the input / output interface may be an input / output circuit.

[0276] In another implementation, the communication device is a chip (system) or circuit used in a communication device. When the communication device is a chip (system) or circuit used in a communication device, the communication unit may be a communication interface (input / output interface), interface circuit, output circuit, input circuit, pin or related circuit on the chip (system) or circuit; the processing unit may be at least one processor, processing circuit or logic circuit.

[0277] In aspect 25, an embodiment of the present application provides a communication device, the communication device comprising a processor. The processor is coupled to a memory and can be used to execute instructions in the memory to implement the method of any aspect of the first to twelfth aspects and any possible implementation method. Optionally, the communication device also includes a memory. Optionally, the communication device also includes a communication interface, and the processor is coupled to the communication interface.

[0278] In aspect 26, an embodiment of the present application provides a communication device, comprising: a logic circuit and a communication interface. The communication interface is used to receive information or send information; the logic circuit is used to receive information or send information through the communication interface, so that the communication device executes the method of any aspect of aspect 1 to aspect 12 and any possible implementation method.

[0279] In aspect twenty-seven, an embodiment of the present application provides a computer-readable storage medium, which is used to store a computer program (also referred to as code, or instructions); when the computer program is run on a computer, the method of any one of aspects one to twelfth above and any possible implementation method is implemented.

[0280] In aspect 28, an embodiment of the present application provides a computer program product, comprising: a computer program (also referred to as code, or instructions); when the computer program is executed, the computer executes the method of any aspect from aspect 1 to aspect 12 above and any possible implementation method.

[0281] In aspect 29, an embodiment of the present application provides a chip, the chip including a processor, the processor is used to execute instructions, when the processor executes the instructions, the chip executes the method of any aspect from aspect 1 to aspect 12 and any possible implementation method. Optionally, the chip also includes a communication interface, the communication interface is used to receive or send signals.

[0282] In aspect 30, an embodiment of the present application provides a communication system, which includes at least one communication device as described in aspects 13 to 24, or the communication device described in aspect 25, or the communication device described in aspect 26, or the chip described in aspect 29.

[0283] In the thirty-first aspect, an embodiment of the present application provides a communication system, comprising at least one of a relay node, a first host node, a second host node and an OAM server, the first host node being used to execute the method of the first aspect, the third aspect, the fifth aspect, the seventh aspect or the ninth aspect and any possible implementation manner, the first host node being used to execute the method of the second aspect, the sixth aspect, the tenth aspect or the eleventh aspect and any possible implementation manner, the second host node being used to execute the method of the twelfth aspect and any possible implementation manner, and the OAM server being used to execute the method of the fourth aspect or the eighth aspect and any possible implementation manner.

[0284] In addition, in the process of executing the method described in any aspect of the first to twelfth aspects and any possible implementation method, the process of sending information and / or receiving information in the above method can be understood as the process of outputting information by the processor, and / or the process of receiving input information by the processor. When outputting information, the processor can output the information to the transceiver (or communication interface, or sending module) so that it can be transmitted by the transceiver. After the information is output by the processor, it may also need to be processed otherwise before it reaches the transceiver. Similarly, when the processor receives the input information, the transceiver (or communication interface, or sending module) receives the information and inputs it into the processor. Furthermore, after the transceiver receives the information, the information may need to be processed otherwise before it is input into the processor.

[0285] Based on the above principle, for example, the sending information mentioned in the above method can be understood as the processor outputting information. For another example, the receiving information can be understood as the processor receiving input information.

[0286] Optionally, for the operations of transmitting, sending and receiving involved in the processor, if there is no special explanation, or if they do not conflict with their actual functions or internal logic in the relevant descriptions, they can be more generally understood as operations such as processor output, reception and input.

[0287] Optionally, in the process of executing the method described in any one of the first to twelfth aspects and any possible implementation methods, the processor may be a processor specifically used to execute these methods, or a processor that executes these methods by executing computer instructions in a memory, such as a general-purpose processor. The memory may be a non-transitory memory, such as a read-only memory (ROM), which may be integrated with the processor on the same chip or may be separately arranged on different chips. The embodiment of the present application does not limit the type of memory and the arrangement of the memory and the processor.

[0288] In a possible implementation manner, the at least one memory is located outside the device.

[0289] In yet another possible implementation, the at least one memory is located within the device.

[0290] In another possible implementation, part of the at least one memory is located inside the device, and another part of the memory is located outside the device.

[0291] In the embodiment of the present application, the processor and the memory may also be integrated into one device, that is, the processor and the memory may also be integrated together.

[0292] In an embodiment of the present application, a first trigger condition for generating (or generating and sending) a result of establishing an F1 interface between a relay node and a target host node is clearly given, wherein the result of establishing the F1 interface can be used to enable the first host node to send UE switching indication information to the correct host node, thereby avoiding the situation where the DU migration of the relay node cannot be completed normally or the migration is erroneous. When the relay node meets the first trigger condition, the relay node can generate (or generate and send) the first information in a timely manner, so that the first host node can initiate a switching request of a user equipment (UE) to the correct host node (target host node) according to the first information, so that the relay node can complete the DU migration normally, and avoid migrating the DU of the relay node to the wrong host node. BRIEF DESCRIPTION OF THE DRAWINGS

[0293] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0294] Figure 1A schematic diagram of the structure of an IAB system provided in an embodiment of the present application;

[0295] Figure 2 A schematic diagram of the structure of an IAB node provided in an embodiment of the present application;

[0296] Figure 3 A schematic diagram of the structure of an IAB network provided in an embodiment of the present application;

[0297] Figure 4 A schematic diagram of a control plane protocol architecture in an IAB network provided in an embodiment of the present application;

[0298] Figure 5 A schematic diagram of a user plane protocol architecture in an IAB network provided in an embodiment of the present application;

[0299] Figure 6 An example of an IAB network architecture diagram provided in an embodiment of the present application;

[0300] Figure 7 An example of a BAP topology of an IAB network provided in an embodiment of the present application;

[0301] Figure 8 An example of DU migration of an IAB network provided in an embodiment of the present application;

[0302] Fig. 9 A flow chart of a communication method provided in an embodiment of the present application;

[0303] Fig.10 A flowchart of another communication method provided in an embodiment of the present application;

[0304] Fig.11 A flowchart of another communication method provided in an embodiment of the present application;

[0305] Fig.12 A flowchart of another communication method provided in an embodiment of the present application;

[0306] Fig.13 A flowchart of another communication method provided in an embodiment of the present application;

[0307] Fig.14 A flowchart of another communication method provided in an embodiment of the present application;

[0308] Fig.15 A flowchart of another communication method provided in an embodiment of the present application;

[0309] Fig.16 A flowchart of another communication method provided in an embodiment of the present application;

[0310] Fig.17 A flowchart of another communication method provided in an embodiment of the present application;

[0311] Fig.18 A flowchart of another communication method provided in an embodiment of the present application;

[0312] Fig.19 A flowchart of another communication method provided in an embodiment of the present application;

[0313] Fig. 20 A flowchart of another communication method provided in an embodiment of the present application;

[0314] Fig.21 A flowchart of another communication method provided in an embodiment of the present application;

[0315] Fig. 22 A schematic diagram of the structure of a communication device provided in an embodiment of the present application;

[0316] Fig.23 A schematic diagram of the structure of a communication device provided in an embodiment of the present application;

[0317] Fig.24 A schematic diagram of the structure of a chip provided in an embodiment of the present application. DETAILED DESCRIPTION

[0318] In order to make the objectives, technical solutions and advantages of the present application clearer, the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0319] The terms "first" and "second" in the specification, claims and drawings of this application are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units that are inherent to these processes, methods, products or devices.

[0320] The "embodiment" mentioned in this article means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It can be explicitly and implicitly understood by those skilled in the art that in the various embodiments of the present application, if there is no special explanation and logical conflict, the terms and / or descriptions between the various embodiments are consistent and can be referenced to each other, and the technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationships.

[0321] It should be understood that in the present application, "at least one (item)" means one or more, "more than one" means two or more, "at least two (items)" means two or three and more than three, and "and / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following items" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0322] It should be noted that in this application, "indication" may include direct indication, indirect indication, explicit indication, and implicit indication. When describing that a certain indication information is used to indicate A, it can be understood that the indication information carries A, directly indicates A, or indirectly indicates A.

[0323] In the present application, the information indicated by the indication information is referred to as the information to be indicated. In the specific implementation process, there are many ways to indicate the information to be indicated, such as but not limited to, the information to be indicated can be directly indicated, such as the information to be indicated itself or the index of the information to be indicated. The information to be indicated can also be indirectly indicated by indicating other information, wherein there is an association relationship between the other information and the information to be indicated. It is also possible to indicate only a part of the information to be indicated, while the other parts of the information to be indicated are known or agreed in advance. For example, the indication of specific information can also be achieved by means of the arrangement order of each information agreed in advance (for example, specified by the protocol), thereby reducing the indication overhead to a certain extent. The information to be indicated can be sent together as a whole, or it can be divided into multiple sub-information and sent separately, and the sending period and / or sending time of these sub-information can be the same or different. The specific sending method is not limited in this application. Among them, the sending period and / or sending time of these sub-information can be pre-defined, for example, pre-defined according to the protocol, or can be configured by the transmitting end device by sending configuration information to the receiving end device.

[0324] It should be noted that in this application, "send" can be understood as "output", and "receive" can be understood as "input". "Send information to A", where "to A" only indicates the direction of information transmission, A is the destination, and does not limit "sending information to A" to direct transmission on the air interface. "Sending information to A" includes sending information directly to A, and also includes sending information to A indirectly through a transmitter, so "sending information to A" can also be understood as "outputting information to A". Similarly, "receiving information from A" means that the source of the information is A, including receiving information directly from A, and also including receiving information from A indirectly through a receiver, so "receiving information from A" can also be understood as "inputting information from A".

[0325] Before introducing the present application, some terms in the embodiments of the present application are briefly explained to facilitate understanding by those skilled in the art.

[0326] 1) Terminal side equipment is a device that provides voice and / or data connectivity to users. In the embodiments of the present application, the terminal side device may be referred to as user equipment (UE), terminal equipment, terminal, mobile station (MS), mobile terminal (MT), etc. For example, the terminal side device may include a handheld device with a wireless connection function, or a communication device connected to a wireless modem. The terminal side device can communicate with the core network via a radio access network (RAN) and exchange voice and / or data with the RAN.

[0327] Some examples of terminal side devices are: mobile station (MS), subscriber unit (subscriberunit), cellular phone (cellular phone), smart phone (smart phone), wireless data card, personal digital assistant (PDA), computer, tablet computer, wireless modem (modem), handheld device (handset), laptop computer (laptop computer), machine type communication (MTC) terminal, wearable device, vehicle terminal device, etc. Terminal side devices also include restricted devices, such as devices with low power consumption, or devices with limited storage capacity, or devices with limited computing power, etc. Terminal side devices also include information sensing devices such as barcodes, radio frequency identification (RFID), sensors, global positioning system (GPS), laser scanners, etc.

[0328] The functions of the terminal side device can be realized by the hardware components inside the terminal device, and the above-mentioned hardware components can be the processor and / or programmable chip inside the above-mentioned terminal device. Optionally, the chip can be realized by an application-specific integrated circuit (ASIC) or a programmable logic device (PLD). The above-mentioned PLD can be any one of a complex programmable logical device (CPLD), a field-programmable gate array (FPGA), a generic array logic (GAL), and a system on a chip (SOC) or any combination thereof.

[0329] 2) Donor base station (donor gNodeB), also known as the donor node, can access the core network through the donor node. In other words, the donor base station is a device in the communication system that connects the terminal side device to the core network. The donor base station is generally connected to the core network through a wired link (such as a fiber optic cable). The donor base station can be responsible for receiving data from the core network and forwarding it to the wireless backhaul device (such as an IAB node), or receiving data from the wireless backhaul device and forwarding it to the core network. The donor base station can generally be connected to the network by wire.

[0330] As an example, the donor base station may include a radio network controller (RNC), a node B (NB), a base station controller (BSC), a base transceiver station (BTS), a home base station (e.g., home evolved NodeB, or home Node B, HNB), a base band unit (BBU), etc., and may also include an evolved base station (NodeB or eNB or e-NodeB, evolutionary Node B) in an evolved LTE system (LTE-Advanced, LTE-A), or may also include a next generation node B (next generation node B, gNB) in a fifth generation mobile communication technology (fifth generation, 5G) new radio (new radio, NR) system, etc. As another example, the donor base station may include a centralized unit (CU) (abbreviated as Donor-CU or gNB-CU in this application) and a distributed unit (DU) (abbreviated as Donor-DU or gNB-DU in this application). The gNB-CU and gNB-DU are connected through the F1 interface, and the F1 interface may further include a control plane interface (F1-C) and a user plane interface (F1-U). The Donor-CU and the core network are connected through a next generation (NG) interface. Among them, the gNB-CU or Donor-CU may also exist in a form in which the user plane (UP) (referred to as CU-UP in this application) and the control plane (CP) (referred to as CU-CP in this application) are separated, that is, the gNB-CU or Donor-CU is composed of a CU-CP and a CU-UP. A gNB-CU may include a gNB-CU-CP and at least one gNB-CU-UP. Alternatively, a Donor-CU may include a Donor-CU-CP and at least one Donor-CU-UP.

[0331] In different systems, CU (or CU-CP and CU-UP), DU or RU may also have different names, but those skilled in the art can understand their meanings. For example, in the ORAN system, CU may also be called O-CU (open CU), DU may also be called O-DU, CU-CP may also be called O-CU-CP, CU-UP may also be called O-CU-UP, and RU may also be called O-RU. For the convenience of description, CU, CU-CP, CU-UP, DU and RU are described as examples in this application. Any unit of CU (or CU-CP, CU-UP), DU and RU in this application may be implemented by a software module, a hardware module, or a combination of a software module and a hardware module.

[0332] The functions of the host base station may be implemented by hardware components inside the host base station, for example, a processor and / or a programmable chip inside the host base station. For example, the chip may be implemented by an ASIC or a PLD. The PLD may be any one of a CPLD, an FPGA, a GAL, and a SOC, or any combination thereof.

[0333] The present application provides a communication method, which is applied to the field of communication technology, such as communication of an IAB network. In order to more clearly describe the solution of the present application, some knowledge related to IAB is first introduced below.

[0334] In the IAB network, the IAB node can establish a wireless backhaul link with one or more upper-level nodes and access the core network through the upper-level node. The upper-level node can perform certain control on the relay node through various signaling (for example, data scheduling, timing modulation, power control, etc.). In addition, the relay node can establish an access link with one or more lower-level nodes and provide access services for one or more lower-level nodes. The upper-level node of the relay node can be a base station or another relay node. The lower-level node of the relay node can be a terminal or another relay node. In some cases, the upper-level node of an IAB node can also be referred to as its upstream node or parent node, and the lower-level node of the IAB node can also be referred to as its downstream node or child node.

[0335] See also Figure 1 , Figure 1 A schematic diagram of the structure of an IAB system provided in an embodiment of the present application.

[0336] like Figure 1 As shown, the IAB node provides wireless access and wireless backhaul for access services to the UE. The IAB host node (IABdonor node) provides wireless backhaul functionality to the IAB node and provides an interface between the UE and the core network. The IAB node is connected to the IAB donor node via a wireless backhaul link, thereby connecting the UE served by the IAB node to the core network.

[0337] See also Figure 2 , Figure 2 A schematic diagram of the structure of an IAB node provided in an embodiment of the present application.

[0338] like Figure 2 As shown, the IAB node in NR can be divided into two parts: MT and DU. MT can also be understood as a component similar to UE. In the IAB node, MT is called a function residing on the IAB node. Since MT is similar to the function of an ordinary UE, it can be understood that MT is used for the IAB node to communicate with the upper node. DU is relative to the CU function of the network device, and DU is used for the IAB node to communicate with the lower node. It should be understood that the upper node can be a base station or other IAB node, and the lower node can be a UE or other IAB node.

[0339] The communication method provided in the embodiment of the present application can be applied to various communication systems including relay nodes, such as NR system, LTE system, LTE-A system, worldwide interoperability for microwave access (WiMAX), or wireless local area networks (WLAN). In LTE, relay nodes are generally referred to as RN. In NR, relay nodes are generally referred to as IAB nodes. In some embodiments, the relay node may also be referred to as a relay device, or a relay transmission and reception point (rTRP), and the upper node of the relay node may be a network device (including a DU of a network device, or including a CU of a network device, etc.).

[0340] See also Figure 3 , Figure 3 A schematic diagram of the structure of an IAB network provided in an embodiment of the present application.

[0341] like Figure 3 As shown, the IAB network includes multiple UEs and multiple IAB nodes. Figure 3 Take 2 UEs and 5 IAB nodes as an example. The 2 UEs are UE1 and UE2, and the 5 IAB nodes are IAB node 1 to IAB node 5. It should be understood that Figure 3The thick line indicates the access link, and the thin line indicates the backhaul link. Among them, UE2 can be connected to the host base station via IAB node 5, IAB node 2 and IAB node 1. UE2 can also be connected to the host base station via IAB node 4, IAB node 2 and IAB node 1. Or UE2 can also be connected to the host base station via IAB node 4, IAB node 3 and IAB node 1. UE1 can be connected to the host base station via IAB node 4, IAB node 3 and IAB node 1. UE1 can be connected to the host base station via IAB node 4, IAB node 2 and IAB node 1.

[0342] It should be noted that Figure 3 The communication system shown is only an example and does not limit the application scenarios to which the embodiments of the present application are applicable. It should be understood that the use of the IAB node in the embodiments of the present application is only for the needs of description, and does not mean that the solution of the embodiments of the present application is only used in the NR scenario. In the embodiments of the present application, the IAB node can refer to any node or device with a relay function, and the use of the IAB node and the relay node in the implementation of the present application should be understood to have the same meaning.

[0343] In the IAB network, the IAB node is connected to the core network via the IAB host node. For example, in the 5G architecture of standalone (SA), the IAB node is connected to the 5G core network (5GC / 5GCN) via the IAB host node. For another example, in the 5G architecture of dual connectivity (DC) or multi-connectivity (MC) (for example: non-standalone (NSA scenario, etc.), on the primary path, the IAB node can be connected to the evolved packet core (EPC) via the evolved NodeB (eNB), or it can be connected to the 5G core network via the IAB host.

[0344] In an IAB network, a transmission path between a UE and an IAB host may include one or more IAB nodes. Each IAB node needs to maintain a wireless backhaul link to the parent node, and also needs to maintain a wireless link with its child nodes. If the child node of an IAB node is a UE, the IAB node and its child node (i.e., the UE) have a wireless access link. If the child node of an IAB node is another IAB node, the IAB node and its child node (i.e., the other IAB node) have a wireless backhaul link. For example, see Figure 3, in the path “UE1→IAB node 4→IAB node 3→IAB node 1→IAB host”, UE1 accesses IAB node 4 through a wireless access link, IAB node 4 is connected to IAB node 3 through a wireless backhaul link, IAB node 3 is connected to IAB node 1 through a wireless backhaul link, and IAB node 1 is connected to the IAB host node through a wireless backhaul link.

[0345] In the embodiment of the present application, the access IAB node refers to the IAB node accessed by the UE, and the intermediate IAB node refers to the IAB node that provides wireless backhaul services for the UE or the IAB node. Figure 3 In the path "UE1→IAB node 4→IAB node 3→IAB node 1→IAB host", IAB node 4 is an access IAB node, and IAB node 3 and IAB node 1 are intermediate IAB nodes. It should be noted that an IAB node is an access IAB node for a UE accessing the IAB node, and an intermediate IAB node for a UE accessing other IAB nodes. Therefore, whether an IAB node is an access IAB node or an intermediate IAB node is not fixed and can be determined based on specific application scenarios.

[0346] It should be noted that Figure 3 The communication system shown is only an example and does not limit the application scenarios applicable to the embodiments of the present application. It should be understood that the IAB node is used in the embodiments of the present application only for the purpose of description, and does not mean that the solution of the embodiments of the present application is only used in the new radio (NR) scenario.

[0347] There is an F1 interface between the DU of the IAB node and the CU of the IAB host. The F1 interface may include two parts: a control plane and a user plane, wherein the user plane part is maintained between the IAB-DU and the IAB donor CU-UP, and the control plane part is maintained between the IAB-DU and the IAB donor CU-CP. Of course, the F1 interface may also be referred to as an F1* interface, and the embodiment of the present application does not limit the name of the interface. And in this article, the interface is referred to as the F1 interface as an example.

[0348] The F1 interface can support user plane protocols (F1-U / F1*-U) and control plane protocols (F1-C / F1*-C). The user plane protocol includes one or more of the following protocol layers: general packet radio service (GPRS) tunneling protocol user plane (GPRS tunnelling protocol user plane, GTP-U) protocol layer, user datagram protocol (UDP) protocol layer, Internet protocol (IP) protocol layer, etc.; the control plane protocol includes one or more of the following protocol layers: F1 application protocol (F1AP), stream control transport protocol (SCTP), IP protocol layer, etc. Through the control plane of the F1 / F1* interface, the IAB node and the IAB host can perform interface management, manage IAB-DU, and perform UE context-related configuration. Through the user plane of the F1 / F1* interface, the IAB node and the IAB host can perform user plane data transmission, downlink transmission status feedback and other functions.

[0349] For example, see Figure 4 and Figure 5 ,in, Figure 4 A schematic diagram of a control plane protocol architecture in an IAB network provided in an embodiment of the present application, Figure 5 A schematic diagram of a user plane protocol architecture in an IAB network provided in an embodiment of the present application.

[0350] For the control plane, Figure 4As shown, a Uu interface is established between UE1 and IAB2-DU, and the equivalent protocol layers include the radio link control protocol (RLC) layer, the media access control layer (MAC) layer and the physical layer (PHY) layer. An F1-C interface is established between IAB2-DU and IAB donor CU 1, and the equivalent protocol layers include the F1AP layer and the SCTP layer. IAB donor DU 1 and IAB donor CU 1 are connected via a wired connection, and the equivalent protocol layers include the internet protocol (IP) layer, L2 and L1. BL is established between IAB node 2 and IAB node 3, between IAB node 3 and IAB node 1, and between IAB node 1 and IAB donor DU 1, and the equivalent protocol layers include the backhaul adaptation protocol (BAP) layer, RLC layer, MAC layer and PHY layer. In addition, a peer-to-peer radio resource control (RRC) layer and packet data convergence protocol (PDCP) layer are established between UE1 and IAB donor CU 1, and a peer-to-peer IP layer is established between IAB2-DU and IAB donor DU 1.

[0351] It can be seen that compared with the control plane protocol stack of a single air interface, the control plane protocol stack of the IAB network, the DU connected to the IAB node realizes the functions of the gNB-DU of a single air interface (i.e., the functions of establishing a peer RLC layer, MAC layer and PHY layer with the UE, and the functions of establishing a peer F1AP layer and SCTP layer with the CU). In other words, the DU connected to the IAB node in the IAB network realizes the functions of the gNB-DU of a single air interface; the IAB donor CU realizes the functions of the gNB-CU of a single air interface.

[0352] On the control plane, the RRC message is encapsulated in the F1AP message between the access IAB node and the IAB donor CU for transmission. Specifically, in the uplink direction, UE1 encapsulates the RRC message in the PDCP protocol data unit (PDU), and sends it to the IAB2-DU after being processed by the RLC layer, MAC layer, and PHY layer in sequence. The IAB2-DU is processed by the PHY layer, MAC layer, and RLC layer in sequence to obtain the PDCP PDU, and the PDCP PDU is encapsulated in the F1AP message, and is processed by the SCTP layer and IP layer in sequence to obtain the IP packet. The IAB2-MT sends the IP packet to the IAB3-DU after being processed by the BAP layer, RLC layer, MAC layer, and PHY layer respectively. The IAB3-DU is processed by the PHY layer, MAC layer, RLC layer, and BAP layer in sequence to obtain the IP packet, and then the IAB3-MT uses operations similar to the IAB2-MT to send the IP packet to the IAB1-DU. Similarly, the IAB1-MT sends the IP packet to the IABdonor DU 1. After IAB donor DU 1 parses and obtains the IP packet, it sends the IP packet to IAB donor CU 1. IABdonor CU 1 processes the IP packet through the SCTP layer, F1AP layer and PDCP layer in sequence to obtain the RRC message. The downlink direction is similar and will not be described here.

[0353] For the user plane, Figure 5 As shown, a Uu interface is established between UE1 and IAB2-DU, and the equivalent protocol layers include the RLC layer, the MAC layer, and the PHY layer. An F1-U interface is established between IAB2-DU and IAB donor CU 1, and the equivalent protocol layers include the GTP-U layer and the user datagram protocol (UDP) layer. IAB donor DU 1 and IABdonor CU 1 are connected via a wired connection, and the equivalent protocol layers include the IP layer, L2, and L1. BL is established between IAB node 2 and IAB node 3, between IAB node 3 and IAB node 1, and between IAB node 1 and IAB donor DU 1, and the equivalent protocol layers include the BAP layer, the RLC layer, the MAC layer, and the PHY layer. In addition, an equivalent SDAP layer and PDCP layer are established between UE1 and IAB donor CU 1, and an equivalent IP layer is established between IAB2-DU and IAB donor DU 1.

[0354] It can be seen that compared with the user plane protocol stack of the single air interface, the user plane protocol stack of the IAB network, the DU of the IAB access node implements some functions of the gNB-DU of the single air interface (i.e., the functions of establishing a peer RLC layer, MAC layer and PHY layer with the terminal, and the functions of establishing a peer GTP-U layer and UDP layer with the IAB donor CU 1). It can be understood that the DU of the IAB access node implements the functions of the gNB-DU of the single air interface; the IAB donor CU implements the functions of the gNB-CU of the single air interface.

[0355] On the user plane, PDCP packets are encapsulated and transmitted in the GTP-U tunnel between the access IAB node and the IAB donor CU. The GTP-U tunnel is established on the F1-U interface.

[0356] The communication method provided in this application is mainly applied to IAB networks, including standalone (SA) IAB networks and non-standalone (NSA) IAB networks. IAB nodes include MT parts and DU parts. IAB donors can be further divided into DU and CU parts. CU can also be divided into CU-CP and CU-UP parts.

[0357] See also Figure 6 , Figure 6 An example of an IAB network architecture diagram provided in an embodiment of the present application.

[0358] like Figure 6 FIG. 4 shows an example of an IAB node connected to an IAB donor via a wireless backhaul link. Figure 6 Take a system including 1 UE, 2 IAB nodes and 2 IAB donors as an example. The two IAB nodes are IAB node 1 and IAB node 2, and both of them include MT part and DU part; the two IAB donors are IAB donor 1 and IABdonor 2. The two IAB donors are IAB donor 1 and IAB donor 2, and each IAB donor can be further divided into DU and CU parts, and CU can be further divided into CU-CP and CU-UP parts. Figure 6In the present invention, the MT of IAB node 2 and the DU of IAB node 1, the MT of IAB node 1 and the DU of IAB donor 1, and the MT of IAB node 1 and the DU of IAB donor 2 all communicate through a wireless backhaul (BH) link; a Uu interface is established between UE and IAB2-DU; an F1-C interface is established between IAB donor DU and IAB donor CU-CP, and an F1-U interface is established between IAB donor DU and IAB donor CU-UP; the DU of IAB donor 2 and the CU of IAB donor 1 are connected through an Internet protocol network (IP) network.

[0359] When the IAB node works in SA mode, the IAB node can be connected to one parent node or two parent nodes. The two parent nodes can be controlled by the same IAB donor or different IAB donors. The DU part of the IAB node can establish an F1 interface with an IAB donor, and the IAB donor can be connected to the 5G core network, that is, Figure 6 The dotted part in the diagram. The IAB-donor-CU-CP is connected to the control plane network elements (such as access and mobility management functions) in the 5GC through the NG control plane interface (NG-C), and the IAB-donor-CU-UP is connected to the user plane network elements (such as user plane functions) in the 5GC through the NG user plane interface (NG-U).

[0360] When the IAB node works in NSA mode, the IAB-donor-CU-UP can be connected to the EPC (for example, connected to the service gateway (SGW)) through the S1 user plane interface (S1-U), there is an LTEUu air interface connection between the MeNB and the MT of the IAB node, there is an X2-C interface between the MeNB and the IAB-donor-CU-CP, and the MeNB is connected to the EPC through the S1 interface (including the S1 interface user plane and the S1 interface control plane), that is, Figure 6 The dotted part in .

[0361] Another possible scenario, Figure 6 The MeNB in ​​the network can also be replaced with a 5G base station gNB. Figure 6The LTE-Uu interface in the NR-Uu interface is replaced by the NR-Uu interface accordingly. The gNB can establish a user plane and / or control plane interface with the 5GC. The gNB and IAB-donor provide dual connection services for the IAB node. The gNB can act as the primary base station of the IAB node, or the secondary base station.

[0362] The above is an example of an application scenario of the technical solution of the embodiment of the present application. It should be understood that the technical solution of the embodiment of the present application is not limited to application only in Figure 6 In the network architecture shown.

[0363] In the IAB network, the IAB node is movable, such as a vehicle-mounted IAB node. For example, the movable IAB node may be referred to as a mobile IAB node (mIAB). Figure 7 As shown, the mIAB node can switch from IAB donor 1 to IAB donor 2 during the movement. Since the coverage of the donor CU1 is limited, it is impossible to always maintain the F1 connection with the mIAB-DU, so the F1 connection of the mIAB-DU needs to be migrated from Donor-CU1 to Donor-CU2. In this scenario, the way in which the mIAB-DU needs to migrate the RRC connection and the F1 connection from Donor-CU1 to Donor-CU2 can be called full migration.

[0364] For example, in an IAB network, in order to enhance network robustness and achieve more sophisticated load balancing and topology management, the mAB node may perform a partial migration process, that is, the MT ( Figure 7 IAB-MT2 in) from a parent node ( Figure 7 IAB-node1) switches to another parent node ( Figure 7 IAB-node3 in the figure). The two parent nodes belong to the topology controlled by different host CUs, namely Figure 7 IAB-node1 in the topology belongs to the topology controlled by Donor-CU1 ( Figure 7 The solid line frame part), IAB-node3 belongs to the topology controlled by Donor-CU2 ( Figure 7 During the partial migration process, the RRC connection of IAB-MT2 is switched from CU1 to CU2, but the F1 connection of IAB-DU2 is still terminated in CU1 (e.g. Figure 7As shown by the solid arrow in the middle, it does not migrate to CU2 along with IAB-MT2. It is understandable that the F1 connection of IAB node 4, a child node of IAB node 2, can also be terminated at CU1 (as shown in FIG. Figure 7 (indicated by the dashed arrow in the middle).

[0365] Exemplarily, the F1 interface of IAB node 2 is terminated at CU1, and IAB host 1 can be called the F1-terminating IAB-donor of IAB node 2. CU2 has an RRC connection with IAB node 2 but the F1 connection of IAB node 2 is not terminated at CU2, and IAB host 2 can be called the non-F1-terminating IAB-donor of IAB node 2.

[0366] After IAB node 2 switches from CU1 topology to CU2 topology, in order to realize the migration of data traffic of IAB node 2 from CU1 topology to CU2 topology, the 3rd generation partnership project (3GPP) Release-17 standard (R17) introduces the IAB Transport Migration Management process, that is, CU1 can perform the IAB Transport Migration Management process to migrate the data traffic of IAB node 2 to CU2 through the Xn interface between CU1 and CU2. The specific IAB Transport Migration Management process is as follows:

[0367] Step S701: CU1 sends an IAB Transport Migration Management request message to CU2, and correspondingly, CU2 receives the IAB Transport Migration Management request message.

[0368] The CU1 is the F1-terminating IAB-donor of the IAB node 2, and the CU2 is the Non-F1-terminating IAB-donor of the IAB node 2. The IAB transport migration management request message is used to request the migration of data traffic of the IAB node 2 to the CU2.

[0369] Step S702: CU2 sends an IAB Transport Migration Management response message to CU1, and correspondingly, CU1 receives the IAB Transport Migration Management response message.

[0370] The IAB transmission migration management response message is used to respond to the above-mentioned IAB transmission migration management request message to migrate the data traffic of the IAB node 2 to the CU2.

[0371] The details of the above-mentioned "IAB Transport Migration Management" process can be referred to the 3GPP protocol TS38.423R17, but it is not limited to the method described in the above-mentioned protocol. In the above-mentioned "IAB Transport Migration Management" process, CUs realize the transfer (offloading) of data traffic by exchanging the quality of service (QoS) of data traffic and the corresponding integrated access and backhaul (IAB) configuration information. The R17 standard defines that this process is performed by the F1-terminating IAB-donor (i.e. Figure 7 CU1) to Non-F1-terminating IAB-donor (i.e. Figure 7 CU2) initiated.

[0372] Furthermore, in the IAB network, considering the wide range mobility of IAB nodes, when the above-mentioned mIAB node moves far away, the mIAB-DU may find it difficult to maintain an IP connection with the original CU, or the transmission delay may be very large. Therefore, in order to support wide range mobility, Rel-18 introduces an important feature, DU migration.

[0373] See also Figure 8 , Figure 8 An example of DU migration of an IAB network provided in an embodiment of the present application.

[0374] like Figure 8 As shown, the RRC connection of the mAB-MT is always on CU2, the F1 interface of the mAB-DU can be migrated from CU1 to CU3, and the F1 interface of the mAB-DU can also be migrated from CU1 to CU4. Figure 8The mIAB-DU1 and mIAB-DU2 in the figure can be understood as two logical DUs on a physical DU. The DU migration is realized in this way: assuming that the original DU is mIAB-DU1, mIAB-node generates a new logical DU as mIAB-DU2, mIAB-DU2 establishes an F1 interface with CU3, CU1 sends a UE handover request to CU3, switches the UE from the cell under mIAB-DU1 to the cell under mIAB-DU2, and then CU1 releases the F1 interface with mIAB-DU1. At this point, the DU migration is completed. Alternatively, assuming that the original DU is mIAB-DU1, mIAB-node generates a new logical DU as mIAB-DU2, mIAB-DU2 establishes an F1 interface with CU4, CU1 sends a UE handover request to CU4, switches the UE from the cell under mIAB-DU1 to the cell under mIAB-DU2, and then CU1 releases the F1 interface with mIAB-DU1. At this point, the DU migration is completed.

[0375] In Rel-18, it is assumed that DU migration is completely decoupled from MT migration, that is, the CU of DU and the CU of MT can always be different. Therefore, if the F1 terminating CU of mAB-DU is always CU2, MT does not necessarily switch from CU1 to CU2 (although this is also a possibility); in DU migration, MT can be in CU2, DU migrates from CU1 to CU3 (especially, CU2 can be the same CU as CU1 or CU3) or DU migrates from CU1 to CU4 (especially, CU2 can be the same CU as CU1 or CU4). The reason why DU migration is assumed to be completely decoupled from MT migration is that the process of DU migration is relatively complicated (it is necessary to generate two logical DUs and switch UEs to the new logical DUs one by one), DU should not be migrated frequently, and the CU of DU is preferably a CU with a larger control range; MT migration is the switching of MT, which may be performed frequently. The selection of MT CU is determined by signal quality, and the CU of MT may be different from the CU of DU.

[0376] There are currently two ways to know which CU the IAB-node will connect to when it joins the network, and how the IAB-node knows which DU it needs to migrate and which target CU it should migrate to. The two methods are OAM trigger or CU trigger. They are described below.

[0377] (1) In the case of OAM triggering, OAM configures the CU of the IAB-DU (for DU migration, it refers to the target CU) on the IAB-node. For example, it can be pre-configured when the IAB leaves the factory (for example, for IAB nodes that have been roughly deployed at a determined location or deployed on a fixed running track, such as IAB nodes on buses); or after the IAB-MT enters the network, the OAM server selects a nearby base station that is suitable as the CU of the IAB-DU based on the location of the IAB-node, and sends the identifier of the CU of the IAB-DU to the IAB-node through the PDU session between the IAB-MT and the core network.

[0378] (2) For the case of CU triggering, specifically, for the case of network access, CU2 informs IAB-MT of the identity of CU1; for the case of DU migration, CU1 informs IAB-DU1 of the identity of CU3 (it is generally not considered that CU2 informs IAB-MT because DU migration is triggered by the source CU of DU). IAB-DU1 triggers IAB-DU2 to initiate the establishment of F1 interface to CU3 through the internal interface.

[0379] Although the IAB-node can determine that it is going to perform DU migration and the corresponding target CU through OAM triggering / CU triggering, in the case of a conflict between OAM triggering and CU triggering, the IAB-node still cannot determine the target CU corresponding to the DU migration, or the IAB-node may determine the wrong target CU corresponding to the DU migration. For example, the OAM trigger indicates that the target CU corresponding to the DU migration is CU2, and the CU trigger indicates that the target CU corresponding to the DU migration is CU3, then the IAB-node may not be able to determine whether the target CU corresponding to the DU migration is CU2 or CU3. It is understandable that the order in which the IAB-node receives the OAM trigger indication information and the CU trigger indication information is not limited, and the CU trigger indication information may be received during the process of performing DU migration according to the OAM trigger indication information, or the OAM trigger indication information may be received during the process of performing DU migration according to the CU trigger indication information. At this time, since the IAB-node cannot determine the target CU corresponding to the DU migration, it may cause the IAB-node to be unable to perform DU migration normally, or the DU migration may fail.

[0380] In view of this, in an embodiment of the present application, a new communication method is provided, which can enable the IAB node to handle the trigger conflict caused by CU triggering and OAM triggering when performing DU migration, so as to determine the target CU corresponding to DU migration, thereby ensuring that the IAB node successfully completes DU migration.

[0381] See also Fig. 9 , Fig. 9 A flow chart of a communication method provided in an embodiment of the present application. The communication method is applied to the field of communication technology, such as communication of an IAB network, and the communication method includes but is not limited to the following steps:

[0382] S901: The relay node generates first information.

[0383] S902: The relay node sends first information to the first host node, and correspondingly, the first host node receives the first information from the relay node.

[0384] It can be understood that the relay node in the embodiment of the present application can be a device equipped with a processor / chip that can be used to execute computer-executable instructions, or it can be a processor / chip that can be used to execute computer-executable instructions. The relay node in the embodiment of the present application includes a terminal side part facing the parent node and a network side part facing the child node, for example, it can include MT and DU, and it can also include MT and gNB, and the embodiment of the present application does not limit this. Among them, the DU migration of the relay node is completely decoupled from the MT migration, so the host node connected to the MT of the relay node and the host node connected to the DU can be different or the same. For example, the MT and DU of the relay node are both connected to the first host node. For another example, the MT of the relay node is connected to the second host node, and the DU of the relay node is connected to the first host node. When the communication method in the embodiment of the present application is applied to the IAB network, the relay node can be an IAB node, the DU of the IAB node is connected to the first host node, and the host node connected to the MT of the IAB node is not limited in the embodiment of the present application, for example, it can be the first host node, the second host node or the target host node, etc. Exemplarily, the relay node can be the above Figure 8 The mAB node in the embodiment of the present application is used to execute the communication method in order to determine the target CU corresponding to the DU migration, thereby ensuring that the IAB node successfully completes the DU migration.

[0385] It can be understood that the first host node in the implementation manner of the present application can be a device equipped with a processor / chip that can be used to execute computer-executable instructions, or it can be a processor / chip that can be used to execute computer-executable instructions. The first host node in the implementation manner of the present application is the source CU corresponding to the DU of the relay node, and the first host node is connected to the DU of the relay node before the relay node performs DU migration. When the communication method in the implementation manner of the present application is applied to an IAB network, the relay node can be an IAB node, and the first host node can be connected to the DU of the IAB node. Exemplarily, the first host node can be the above-mentioned Figure 8 CU1 in the embodiment of the present application is used to execute the communication method in order to determine the target CU corresponding to DUmigration, thereby ensuring that the IAB node successfully completes the DU migration.

[0386] The second host node and the target host node in the implementation manner of the present application may be devices equipped with a processor / chip that can be used to execute computer-executable instructions, or may be a processor / chip that can be used to execute computer-executable instructions. In the implementation manner of the present application, the second host node is the wrong host node after the DU is migrated, and the target host node is the correct host node after the DU is migrated. For example, in the case of a trigger conflict, the instruction triggered by the network manager shall prevail, then the host node indicated by the network manager is the correct host node, and the host node indicated by the first host node is the wrong host node. For example, in the case of a trigger conflict, the instruction triggered by the network manager shall prevail, the network manager instructs the DU of the relay node to be migrated to the third host node, and the first CU instructs the relay node to be migrated to the fourth host node. Then, the third host node is the correct host node, and the fourth host node is the wrong host node. Exemplarily, the second host node may be the above-mentioned Figure 8 In CU4, the target host node can be the above Figure 8 CU3 in the embodiment of the present application is used to execute the communication method in order to determine the target CU corresponding to DUmigration, thereby ensuring that the IAB node successfully completes the DU migration.

[0387] The network manager in the implementation mode of the present application may be a device equipped with a processor / chip that can be used to execute computer-executable instructions, or may be a processor / chip that can be used to execute computer-executable instructions. The network manager in the implementation mode of the present application is a network manager of a relay node, which can communicate with the relay node. The network manager generally refers to an operation management and maintenance (orchestration and management, OAM) server, which may be any network element located in the core network. The OAM trigger mentioned above generally refers to OAM instructing the relay node to perform DU migration by pre-configuration or remote control. When the communication method in the implementation mode of the present application is applied to an IAB network, the network manager may be an OAM server, and the OAM server may be connected to an IAB node. For example, the OAM server is connected to the MT of the IAB node, or the OAM server is connected to the DU of the IAB node, and this is not limited in the embodiments of the present application.

[0388] Specifically, the above S901 and / or S902 are executed when the following triggering conditions are met:

[0389] When the first trigger condition is met, the relay node generates the first information, and the first trigger condition can be understood as a condition that triggers the relay node to generate the first information. Optionally, when the above first trigger condition is met, the relay node also sends the first information, and the first trigger condition can be understood as a condition that triggers the relay node to generate and send the first information.

[0390] The first trigger condition includes but is not limited to one or more of the following:

[0391] (1) Based on the second information provided by the network manager, the network manager provides the second information to the relay node accordingly, where the second information is used to instruct the relay node to establish a first F1 interface with the target host node.

[0392] (2) The relay node receives the third information from the first host node. Accordingly, the first host node sends the third information to the relay node. The third information is used to instruct the relay node to establish a second F1 interface with a second host node, and the second host node is different from the target host node.

[0393] It should be understood that the several trigger conditions listed above are merely illustrative examples of possible triggering execution of S901 and / or S902, and should not be used to limit the embodiments of the present application. Embodiments obtained based on the supplement or reasonable deformation of the above trigger conditions all fall within the scope of protection of the embodiments of the present application.

[0394] Among them, the above-mentioned first information includes the result of the relay node and the target host node establishing the first F1 interface. The result may be, for example, that the relay node and the target host node complete the establishment of the F1 interface, or that the relay node and the target host node do not complete the establishment of the F1 interface, etc. The implementation method of the present application does not limit this. The first information may also carry an identifier of the target host node, such as a gNB ID and / or an IP address, etc. The first information may also carry an identifier of the target cell (i.e., the cell under the target DU) (such as: NR cell global identifier NCGI), and the first host node may obtain the identifier of the target host node based on the identifier of the target cell.

[0395] Optionally, the first information may be, for example, a message carried in an F1 application protocol (F1 application protocol, F1 AP), such as a class 1 RESPONSE MESSAGE or a class 2 MESSAGE.

[0396] Optionally, the second information may be information preconfigured by the network manager. For example, the preconfiguration information instructs the relay node to perform DU migration at a specified time point. Specifically, the preconfiguration information instructs the relay node to start DU migration one hour after joining the network. The implementation methods of the present application do not limit how to preconfigure, the content of the preconfiguration information, etc. The second information may also be sent to the relay node by the network manager through remote control. For example, the network manager may send the second information to the relay node through an IP network. Specifically, the network manager may first send the second information to the non-access stratum (NAS) layer of the relay node, and the NAS layer may then send the second information to the access stratum (AS) layer, and the relay node obtains the second information from the AS layer.

[0397] Optionally, the third information is used to instruct the relay node to establish an F1 interface with the second host node, and the third information may carry an identifier of the second host node, such as a gNB ID and / or an IP address.

[0398] Optionally, the third information may be carried in an F1AP message, and the message name may be MIAB F1 SETUPTRIGGERING.

[0399] In the IAB network, the DU migration of the IAB node supports two triggering modes: source CU triggering and OAM triggering. In the source CU triggering (hereinafter referred to as "CU triggering") mode, the source CU will send an indication message carrying the target CU to the DU in the IAB node, and the DU will complete the migration operation based on the indication message. The source CU is the CU connected to the DU before the migration, and the target CU is the CU connected to the DU after the migration. In the OAM triggering mode, the OAM server can be directly pre-configured in the IAB node or remotely trigger the IAB node to perform DU migration. Obviously, both CU triggering and OAM triggering can instruct the relay node to perform DU migration. If the CU triggering and OAM triggering occur at the same time, the relay node may not be able to complete the DU migration normally, or may migrate to the wrong host node. In addition, in the case of a conflict between the two triggers, at least one trigger indication (such as CU triggering) is not completed, which may also cause abnormalities such as control failure and information transmission errors.

[0400] In the implementation manner of the present application, a first trigger condition for generating (or generating and sending) the result of establishing an F1 interface between a relay node and a target host node is clearly given, wherein the result of establishing the F1 interface can be used to enable the first host node to send UE switching indication information to the correct host node, thereby avoiding the situation where the DU migration of the relay node cannot be completed normally or the migration is wrong. When the relay node meets the first trigger condition, the relay node can generate (or generate and send) the first information in a timely manner, so that the first host node can initiate a switching request of the user equipment (UE) to the correct host node (target host node) according to the first information, so that the relay node can complete the DU migration normally, and avoid the DU of the relay node from being migrated to the wrong host node.

[0401] In a possible implementation manner, the result of the first F1 interface is that the F1 interface between the relay node and the target host node is established.

[0402] It can be understood that the F1 interface between the relay node and the target host node is established. For example, the target host node generates and sends an F1AP message (for example, F1 SETUP RESPONSE) to the relay node to indicate that the F1 interface is established. It can also be that the relay node receives an F1AP message (for example, F1 SETUP RESPONSE) returned by the target host node to indicate that the F1 interface is established.

[0403] In the implementation manner of the present application, the result of the first F1 interface is that the F1 interface between the relay node and the target host node is established (complete), wherein the target host node is different from the host node indicated by the CU trigger. The relay node sends the information that its F1 interface is established to the first host node through the first information, so that the first host node can instruct the correct host node (target host node) to switch the UE, so that the relay node can successfully complete the DU migration.

[0404] In a possible implementation manner, the second information is also used to trigger the release of the second F1 interface.

[0405] In the implementation manner of the present application, the second information is used to instruct the relay node to establish a first F1 interface with the target host node, and the second F1 interface is an F1 interface between the relay node and the second host node. If the relay node has established a second F1 interface with the second host node before receiving the second information, the second information will be used to trigger the release of the second F1 interface. This enables the relay node to establish the first F1 interface with the target host node. In addition, it can also save resources of the second host node, making it easier for the second host node to establish an F1 interface with other relay nodes.

[0406] Optionally, the second information provided by the network management is equivalent to OAM triggering the DU migration of the relay node. The OAM triggering time may occur after the CU triggering and before the relay node receives the second F1 interface establishment completion message. For example, the OAM triggering may occur after the relay node sends the F1 interface establishment message to the second host node and before the relay node receives the F1 SETUP RESPONSE message from the second host node.

[0407] It should be noted that the second information may carry information indicating the release of the second F1 interface, or may not carry information indicating the release of the second F1 interface. In the case where the second information carries information indicating the release of the second F1 interface, the relay node may send a request to release the second F1 interface (for example, F1REMOVAL REQUEST) to the second host node based on the indication information. In the case where the second information does not carry information indicating the release of the second F1 interface, the relay node may default to the DU migration indicated by the second information upon receiving the second information, thereby autonomously sending a request to release the second F1 interface (for example, F1 REMOVAL REQUEST) to the second host node. This is equivalent to a logic that can be built into the relay node, that is, after receiving the indication information triggered by OAM, the OAM trigger is defaulted to prevail, and the migration process indicated by the CU trigger is terminated.

[0408] By triggering the release of the second F1 interface, it is possible to ensure that the establishment of the first F1 interface is completed, so that the relay node can successfully complete the DU migration.

[0409] In a possible implementation manner, the first information further includes an identifier of the target host node and / or a triggering method for DU migration.

[0410] In the implementation manner of the present application, the identifier of the target host node may be, for example, a gNB ID and / or an IP address, etc. The triggering method of DU migration may be, for example, an OAM trigger. The identifier of the target host node is carried in the first information, which can facilitate the first host node to communicate with the target host node and instruct the target host node to perform UE switching. The migration triggering method of the DU carried in the first information can let the first host node know the reason why the relay node did not establish the F1 interface according to its own instructions.

[0411] Optionally, when the first F1 interface is an F1 interface established by an OAM trigger indication and / or the OAM trigger is inconsistent with the CU trigger, the first information may include a triggering method for DU migration.

[0412] Optionally, the first information can be carried in a class 1RESPONSE message or a REJECT / FAILURE message of a CU-triggered F1 message, or in a separate class 2 message. Among them, the class 1 message needs to get a response from the other end, and the class 2 message does not need to get a response from the other end. For example, the relay node sends a class 1 message (such as RESPONSE / REJECT / FAILURE) to the first host node in response to another class 1 message (such as REQUEST) sent by the first host node to the relay node. When the relay node sends a class 2 message to the first host node, it does not need to be a response message to a specific message, and the class 2 message can be understood as a notification message.

[0413] See also Fig.10 , Fig.10 The flowchart of a communication method provided in the embodiment of the present application is shown in FIG. Fig. 9 or, it can be understood that the communication method in the embodiment of the present application can also be regarded as an embodiment that can be executed independently, and the present application does not limit this. The communication method provided in the embodiment of the present application is applied to the field of communication technology, such as communication of IAB network.

[0414] It is understood that the IAB (including IAB-DU and IAB-MT) involved in the communication method provided in the embodiment of the present application can refer to the above Fig. 9 The relay node in the communication method shown, CU1 can refer to the above Fig. 9 The first host node in the communication method shown in the embodiment of the present application and the CU3 involved in the communication method provided in the embodiment of the present application can refer to the above Fig. 9 The target host node in the communication method shown in the figure, the CU4 involved in the communication method provided in the embodiment of the present application can refer to the above Fig. 9 The second host node in the communication method shown in the embodiment of the present application may refer to the above OAM involved in the communication method provided in the embodiment of the present application. Fig. 9 The OAM server in the communication method shown is not described in detail here.

[0415] The communication method may include one or more steps from step 1 to step 6. It should be understood that for the convenience of description, the description is given in the order of steps 1 to 6, and it is not intended to limit the execution to the above order. The embodiment of the present application does not limit the execution order, execution time, and number of executions of the above one or more steps. Steps 1 to 6 are as follows:

[0416] Step 1. OAM triggers DU migration.

[0417] It is understandable that OAM triggers DU migration, which can be triggered by pre-configuration or by remote control. Figure 8 The description of OAM triggering in the description is not repeated here.

[0418] The OAM trigger indicates that the target CU of the DU migration of the IAB-node is CU3. It should be noted that OAM triggers DU migration, which usually refers to the indication information from the OAM server used to indicate that the IAB-node is or will perform DU migration. Correspondingly, the IAB-node receives the indication information from the OAM server and prepares or is generating the indication information (for example, F1 SETUP RESQUEST) requesting DU migration. Alternatively, based on the OAM trigger, the IAB-node determines to perform DU migration, and the target CU is CU3.

[0419] Step 2. IAB-DU2 sends an F1 interface establishment request (eg, F1 SETUP REQUEST) to CU3. Correspondingly, CU3 also receives the F1 interface establishment request from IAB-DU2.

[0420] Step 3. CU triggers DU migration. Specifically, CU1 sends an indication message of CU triggering DU migration to IAB-DU1. The message may be carried in an F1AP message, indicating that the target CU of DU migration is CU4. Optionally, the message may carry an identifier of CU4, such as a gNB ID and / or IP address.

[0421] Step 4. CU3 sends a message (such as F1 SETUP RESPONSE) to IAB-DU2 indicating that the establishment of the F1 interface is completed. Correspondingly, IAB-DU2 also receives a message from CU3 indicating that the establishment of the F1 interface is completed.

[0422] It should be noted that the execution order of step 3 and step 4 is not limited in the present embodiment of the application. For example, step 3 may be executed first and then step 4, or step 4 may be executed first and then step 3.

[0423] Step 5. IAB-DU1 sends an F1AP message to CU1.

[0424] From the above steps, it can be known that the target CUs indicated by the OAM trigger and the CU trigger are different (CU3 and CU4 respectively), and the indication of the OAM trigger shall prevail (that is, IAB-DU2 establishes an F1 interface with CU3). Since IAB-DU2 and CU3 have already established the F1 interface, CU1 now needs to instruct CU3 to switch the UE. Therefore, the F1AP message sent by IAB-DU1 to CU1 includes the result of the establishment of the F1 interface between IAB-DU2 and CU3, for example, the establishment of the F1 interface between IAB-DU2 and CU3 is completed. Optionally, the F1AP message will also carry the identification of CU3, such as gNB ID and / or IP address, etc. It is used to allow CU1 to issue a UE switching indication to the correct CU (CU3), thereby completing the DU migration of the IAB-node.

[0425] Optionally, the F1AP message may also carry indication information of a DU migration triggering mode (eg, OAM triggering).

[0426] Optionally, the F1AP message may be carried in a class 1 message of the F1 message triggered by the CU, such as a RESPONSE message or a REJECT / FAILRE message. The F1AP message may also be carried in a class 2 message of the F1 message triggered by the CU, such as a UL RRC MESSAGE TRANSFER, a DL RRC MESSAGE TRANSFER, etc.

[0427] Optionally, when the following conditions are met, the indication information of the DU migration triggering mode may be carried in the F1AP message.

[0428] Step 6. CU1 sends an instruction message to CU4 to cancel the establishment of the F1 interface.

[0429] The indication information may be carried in an F1AP message, for example, specifically, the indication message is used to indicate the cancellation of establishing the F1 interface between CU4 and IAB-DU2. Optionally, the indication information may carry an identifier of IAB-DU2, for example, a gNB ID and / or an IP address.

[0430] Step 6 is optional and exemplary, and may be performed when one or more of the following conditions are met, including:

[0431] (1) CU1 receives the F1AP message described in step 5, which is equivalent to the completion of step 5. For example, CU1 receives the indication information that the relay node and the target host node have completed the establishment of the F1 interface, and the target host node is different from the second host node. Specifically, CU1 receives the indication information that IAB-DU2 and DU3 have completed the establishment of the F1 interface.

[0432] (2) There is interaction between CU1 and CU4, for example, CU1 sends indication information to CU4 to indicate that CU4 is about to establish an F1 interface with IAB-DU2. Alternatively, CU1 sends indication information to CU4 to indicate that CU4 is about to establish an F1 interface with IAB-DU2.

[0433] (3) There is a preset configuration in CU4, and the preset configuration is used to instruct CU4 to establish an F1 interface with IAB-DU2.

[0434] Optionally, condition 2 and condition 3 occur during the DU migration process of the IAB-node.

[0435] Through the embodiments of the present application, it is clarified that in the case of a trigger conflict during DU migration, the OAM trigger shall prevail, thereby avoiding the situation where the target CU of DU migration is uncertain due to the trigger conflict, and ensuring the smooth completion of DU migration.

[0436] Above Fig.10 In the illustrated implementation, OAM triggering is earlier than CU triggering, and OAM triggering takes precedence. However, there is also a case where CU triggering is earlier than OAM triggering, and OAM triggering takes precedence.

[0437] See next Fig.11 , Fig.11This is a flow chart of another communication method provided in an embodiment of the present application. It can be understood that the steps in the embodiment of the present application can be regarded as the above Fig. 9 or, it can be understood that the communication method in the embodiment of the present application can also be regarded as an embodiment that can be executed independently, and the present application does not limit this. The communication method provided in the embodiment of the present application is applied to the field of communication technology, such as communication of IAB network.

[0438] It is understood that the IAB (including IAB-DU and IAB-MT) involved in the communication method provided in the embodiment of the present application can refer to the above Fig. 9 The relay node in the communication method shown, CU1 can refer to the above Fig. 9 The first host node in the communication method shown in the embodiment of the present application and the CU3 involved in the communication method provided in the embodiment of the present application can refer to the above Fig. 9 The target host node in the communication method shown in the figure, the CU4 involved in the communication method provided in the embodiment of the present application can refer to the above Fig. 9 The second host node in the communication method shown in the embodiment of the present application may refer to the above OAM involved in the communication method provided in the embodiment of the present application. Fig. 9 The OAM server in the communication method shown is not described in detail here.

[0439] The communication method may include one or more steps from step 1 to step 9. It should be understood that for the convenience of description, the description is given in the order of steps 1 to 9, and it is not intended to limit the execution to the above order. The embodiment of the present application does not limit the execution order, execution time, and number of executions of the above one or more steps. Steps 1 to 9 are as follows:

[0440] Step 1. CU triggers DU migration.

[0441] Specifically, CUI sends an F1AP message to IAB-DU1 to instruct IAB-node to perform DU migration. Correspondingly, IAB-DU1 receives the F1AP message from CU1. Optionally, the message may carry the identifier of the target CU. For example, if the target CU is CU4, the F1AP message may carry the gNB ID and / or IP address of CU4.

[0442] Step 2. IAB-DU2 initiates an F1 interface establishment request to CU4. Correspondingly, CU4 also receives the F1 interface establishment request sent by IAB-DU2.

[0443] For example, IAB-DU2 may initiate an F1 interface establishment request to CU4 via an F1AP message, where the F1AP message may be, for example, an F1 SETUP REQUEST message. Optionally, the F1AP message may carry an identifier of IAB-DU2, such as a gNB ID and / or an IP address.

[0444] Step 3: CU4 sends a message to IAB-DU2 indicating that the establishment of the F1 interface is completed. Correspondingly, IAB-DU2 also receives a message from CU4 indicating that the establishment of the F1 interface is completed.

[0445] For example, CU4 may send a message indicating that establishment of the F1 interface is completed to IAB-DU2 via an F1AP message. The F1AP message may be, for example, an F1 SETUP REQUEST message.

[0446] Step 4. OAM triggers DU migration.

[0447] It is understandable that OAM triggers DU migration, which can be triggered by pre-configuration or by remote control. Figure 8 The description of OAM triggering in the description is not repeated here.

[0448] The OAM trigger indicates that the target CU of the DU migration of the IAB-node is CU3. It should be noted that OAM triggers DU migration, which usually refers to the indication information from the OAM server used to indicate that the IAB-node is or will perform DU migration. Correspondingly, the IAB-node receives the indication information from the OAM server and prepares or is generating the indication information (for example, F1 SETUP RESQUEST) requesting DU migration. Alternatively, based on the OAM trigger, the IAB-node determines to perform DU migration, and the target CU is CU3.

[0449] Optionally, the execution order of step 3 and step 4 is not limited in the embodiment of the present application. For example, step 3 may be executed first and then step 4, or step 4 may be executed first and then step 3.

[0450] Step 5. IAB-DU2 sends an F1 interface release request to CU4. Correspondingly, CU4 also receives the F1 interface release request from IAB-DU2.

[0451] After receiving the OAM-triggered indication information, IAB-DU2 knows that it needs to follow the OAM-triggered indication information, so IAB-DU2 sends an F1 interface release request to CU4. CU4 needs to release the F1 interface before IAB-DU2 can establish an F1 interface with the CU of other host nodes.

[0452] The F1 interface release request may be carried in an F1AP message, such as an F1 REMOVAL REQUEST message.

[0453] Optionally, if before step 4, CU1 has started to switch UEs to CU4, it is also necessary to switch these UEs back to CU1, or to other CUs except CU4.

[0454] Step 6: CU4 sends a message indicating that the F1 interface is released to IAB-DU2. Correspondingly, IAB-DU2 also receives a message indicating that the F1 interface is released from CU4.

[0455] The information on completion of releasing the F1 interface may be carried in an F1AP message, for example, an F1 REMOVAL RESPONSE message.

[0456] Step 7: IAB-DU2 sends an F1 interface establishment request to CU3. Correspondingly, CU3 also receives the F1 interface establishment request sent by IAB-DU2.

[0457] After IAB-DU2 receives the information of completing the release of the F1 interface from CU4, IAB-DU2 may send information of requesting the establishment of the F1 interface to CU3.

[0458] Optionally, the message may be carried in an F1AP message, for example, an F1 SETUP REQUEST message.

[0459] Step 8. CU3 sends a message to IAB-DU2 indicating that the establishment of the F1 interface is completed. Correspondingly, IAB-DU2 also receives a message from CU3 indicating that the establishment of the F1 interface is completed.

[0460] Optionally, the information may be carried in an F1AP message, for example, an F1 SETUP RESPONSE message.

[0461] Step 9. IAB-DU1 sends an F1AP message to CU1.

[0462] From the above steps, it can be known that the target CUs indicated by the OAM trigger and the CU trigger are different (CU3 and CU4 respectively), and the indication of the OAM trigger shall prevail (that is, IAB-DU2 establishes an F1 interface with CU3). Since IAB-DU2 and CU3 have already established the F1 interface, CU1 now needs to instruct CU3 to switch the UE. Therefore, the F1AP message sent by IAB-DU1 to CU1 includes the result of the establishment of the F1 interface between IAB-DU2 and CU3, for example, the establishment of the F1 interface between IAB-DU2 and CU3 is completed. Optionally, the F1AP message will also carry the identification of CU3, such as gNB ID and / or IP address, etc. It is used to allow CU1 to issue a UE switching indication to the correct CU (CU3), thereby completing the DU migration of the IAB-node.

[0463] Optionally, the F1AP message may also carry indication information of a DU migration triggering mode (eg, OAM triggering).

[0464] Optionally, the F1AP message may be carried in a class 1 message of the F1 message triggered by the CU, such as a RESPONSE message or a REJECT / FAILRE message. The F1AP message may also be carried in a class 2 message of the F1 message triggered by the CU, such as a UL RRC MESSAGE TRANSFER, a DL RRC MESSAGE TRANSFER, etc.

[0465] Optionally, when the following conditions are met, the indication information of the DU migration triggering mode may be carried in the F1AP message.

[0466] Through the embodiments of the present application, it is clarified that in the case of a trigger conflict during DU migration, the OAM trigger shall prevail, thereby avoiding the situation where the target CU of DU migration is uncertain due to the trigger conflict, and ensuring the smooth completion of DU migration.

[0467] See also Fig.12 , Fig.12 A flow chart of another communication method provided in an embodiment of the present application. The communication method is applied to the field of communication technology, such as communication of an IAB network, and the communication method includes but is not limited to the following steps:

[0468] S1201: The relay node generates fourth information.

[0469] S1202: The relay node sends fourth information to the network manager, and correspondingly, the network manager receives the fourth information from the relay node.

[0470] It can be understood that the relay node in the embodiment of the present application can be a device equipped with a processor / chip that can be used to execute computer-executable instructions, or it can be a processor / chip that can be used to execute computer-executable instructions. The relay node in the embodiment of the present application includes a terminal side part facing the parent node and a network side part facing the child node, for example, it can include MT and DU, and it can also include MT and gNB, and the embodiment of the present application does not limit this. Among them, the DU migration of the relay node is completely decoupled from the MT migration, so the host node connected to the MT of the relay node and the host node connected to the DU can be different or the same. For example, the MT and DU of the relay node are both connected to the first host node. For another example, the MT of the relay node is connected to the second host node, and the DU of the relay node is connected to the first host node. When the communication method in the embodiment of the present application is applied to the IAB network, the relay node can be an IAB node, the DU of the IAB node is connected to the first host node, and the host node connected to the MT of the IAB node is not limited in the embodiment of the present application, for example, it can be the first host node, the second host node or the target host node, etc. Exemplarily, the relay node can be the above Figure 8 The mAB node in the embodiment of the present application is used to execute the communication method in order to determine the target CU corresponding to the DU migration, thereby ensuring that the IAB node successfully completes the DU migration.

[0471] It can be understood that the first host node in the implementation manner of the present application can be a device equipped with a processor / chip that can be used to execute computer-executable instructions, or it can be a processor / chip that can be used to execute computer-executable instructions. The first host node in the implementation manner of the present application is the source CU corresponding to the DU of the relay node, and the first host node is connected to the DU of the relay node before the relay node performs DU migration. When the communication method in the implementation manner of the present application is applied to an IAB network, the relay node can be an IAB node, and the first host node can be connected to the DU of the IAB node. Exemplarily, the first host node can be the above-mentioned Figure 8 CU1 in the embodiment of the present application is used to execute the communication method in order to determine the target CU corresponding to DUmigration, thereby ensuring that the IAB node successfully completes the DU migration.

[0472] The second host node and the target host node in the implementation manner of the present application may be devices equipped with a processor / chip that can be used to execute computer-executable instructions, or may be a processor / chip that can be used to execute computer-executable instructions. In the implementation manner of the present application, the second host node is the wrong host node after the DU is migrated, and the target host node is the correct host node after the DU is migrated. For example, in the case of a trigger conflict, the instruction triggered by the network manager shall prevail, then the host node indicated by the network manager is the correct host node, and the host node indicated by the first host node is the wrong host node. For example, in the case of a trigger conflict, the instruction triggered by the network manager shall prevail, the network manager instructs the DU of the relay node to be migrated to the third host node, and the first CU instructs the relay node to be migrated to the fourth host node. Then, the third host node is the correct host node, and the fourth host node is the wrong host node. Exemplarily, the second host node may be the above-mentioned Figure 8 In CU4, the target host node can be the above Figure 8 CU3 in the embodiment of the present application is used to execute the communication method in order to determine the target CU corresponding to DUmigration, thereby ensuring that the IAB node successfully completes the DU migration.

[0473] The network manager in the implementation mode of the present application may be a device equipped with a processor / chip that can be used to execute computer-executable instructions, or may be a processor / chip that can be used to execute computer-executable instructions. The network manager in the implementation mode of the present application is a network manager of a relay node, which can communicate with the relay node. The network manager generally refers to an operation management and maintenance (orchestration and management, OAM) server, which may be any network element located in the core network. The OAM trigger mentioned above generally refers to OAM instructing the relay node to perform DU migration by pre-configuration or remote control. When the communication method in the implementation mode of the present application is applied to an IAB network, the network manager may be an OAM server, and the OAM server may be connected to an IAB node. For example, the OAM server is connected to the MT of the IAB node, or the OAM server is connected to the DU of the IAB node, and this is not limited in the embodiments of the present application.

[0474] Optionally, the above S1201 and / or S1202 are performed when the following triggering conditions are met:

[0475] When the second trigger condition is met, the relay node generates the fourth information, and the second trigger condition can be understood as a condition that triggers the relay node to generate the fourth information. Optionally, when the above second trigger condition is met, the relay node also sends the fourth information, and the second trigger condition can be understood as a condition that triggers the relay node to generate and send the fourth information.

[0476] The second trigger condition includes but is not limited to the following conditions:

[0477] (1) The relay node receives the fifth information from the first host node, and accordingly, the first host node also sends the fifth information to the relay node, wherein the fifth information is used to instruct the relay node to establish a third F1 interface with the target host node.

[0478] (2) Based on the sixth information provided by the network management, it is equivalent to the relay node receiving the trigger information from the network management (which can be pre-configured or remotely controlled). Accordingly, the network management will also provide the sixth information to the relay node, which is equivalent to the network management pre-configuring the OAM triggering information on the relay node, or the network management triggering DU migration by remote control. The sixth information is used to instruct the relay node to establish a fourth F1 interface with the second host node, and the second host node is different from the target host node.

[0479] (3) The relay node receives the seventh information from the target host node, and correspondingly, the target host node also sends the seventh information to the relay node, wherein the seventh information is used to indicate that the establishment of the third F1 interface is completed.

[0480] It should be understood that the several trigger conditions listed above are merely possible illustrative descriptions of triggering the execution of S1201 and / or S1202, and should not be used to limit the embodiments of the present application. Embodiments obtained based on the supplement or reasonable deformation of the above-mentioned trigger conditions all fall within the scope of protection of the embodiments of the present application.

[0481] The fifth information may be carried in an F1AP message, such as MIAB F1 SETUP TRIGGERING. The fifth information is used to instruct the relay node to establish a third F1 interface with the target host node, and may be a message instructing the relay node to send a request to establish an F1 interface to the target host node, such as sending an F1 SETUP REQUEST message.

[0482] Among them, the sixth information mentioned above can be a message preconfigured by the network manager in the relay node. The preconfigured time can be, for example, before the relay node enters the network, or after the relay node enters the network. The implementation method of the present application does not limit this. The preconfigured information can instruct the relay node to perform DU migration and the host node of the DU migration at a preset time. For example, the preconfigured information can instruct the relay node to start DU migration one hour after entering the network, and instruct the relay node to migrate to the CU of the target host node. The sixth information can also be a message sent by the network manager to the relay node by remote control triggering. For example, the sixth message is sent remotely to the relay node through the IP network, instructing the relay node to establish a second F1 interface with the second host node.

[0483] The seventh information may be carried in an F1AP message, such as F1 SETUP RESPONSE. The relay node may generate the seventh information after receiving a message (such as F1 SETUP RESPONSE) indicating that the F1 interface establishment is completed returned by the target host node.

[0484] In the IAB network, the DU migration of the IAB node supports two triggering modes: source CU triggering and OAM triggering. In the source CU triggering (hereinafter referred to as "CU triggering") mode, the source CU will send an indication message carrying the target CU to the DU in the IAB node, and the DU will complete the migration operation based on the indication message. The source CU is the CU connected to the DU before the migration, and the target CU is the CU connected to the DU after the migration. In the OAM triggering mode, the OAM server can be directly pre-configured in the IAB node or remotely trigger the IAB node to perform DU migration. Obviously, both CU triggering and OAM triggering can instruct the relay node to perform DU migration. If the CU triggering and OAM triggering occur at the same time, the relay node may not be able to complete the DU migration normally, or may migrate to the wrong host node. In addition, in the case of a conflict between the two triggers, at least one trigger indication (such as an OAM trigger) is not completed, which may also cause abnormalities such as control failure and information transmission errors.

[0485] In the implementation manner of the present application, the first trigger condition for generating (or generating and sending) the result of establishing the F1 interface between the relay node and the target host node is clearly given, wherein the result of establishing the F1 interface can be used to enable OAM to obtain the latest connection status of the relay node. When the relay node meets the first trigger condition, the relay node can generate (or generate and send) the first information in a timely manner, so that OAM can update the connection status of the relay node in a timely manner, which is convenient for OAM to subsequently manage the relay node and re-trigger the DU migration of the relay node. Obviously, this situation is based on the indication information triggered by the CU. After the relay node establishes an F1 interface connection with the new host node (target host node), the first host node can send an indication of UE switching to the new host node. The first host node obtains that the relay node completes the establishment of a new F1 interface, for example, it can be a message that the relay node sends the F1 interface establishment completion to the first host node, for example, the relay node sends a message that the F1 interface establishment completion to the first host node through an F1AP message. Specifically, the implementation manner of the present application is not limited.

[0486] In a possible implementation manner, the fifth information is also used to trigger the release of the fourth F1 interface.

[0487] This enables the relay node to establish a third F1 interface with the target host node. In addition, it can save resources of the second host node, making it easier for the second host node to establish an F1 interface with other relay nodes.

[0488] Optionally, the fifth information provided by the network management is equivalent to an OAM trigger, and the OAM trigger may occur after the CU trigger and before the relay node receives the fourth F1 interface establishment completion message. For example, the OAM trigger may occur after the relay node sends an F1 interface establishment message to the second host node and before the relay node receives an F1SETUP RESPONSE message from the second host node.

[0489] In a possible implementation manner, the fourth information further includes an identifier of the target host node and / or a triggering method for the DU migration.

[0490] Among them, the identifier of the target host node may be, for example, a gNB ID and / or an IP address. The triggering method of DU migration may be, for example, a CU trigger. The fourth information carries the identifier of the target host node, which can facilitate OAM to know that the relay node has established an F1 interface with the target host node, and adjust the connection relationship of the relay node, so as to facilitate the subsequent management of the relay node and the execution of the next DU migration. The fourth information carries the DU migration triggering method, which can let OAM know whose instructions the relay node has established the F1 interface.

[0491] In a possible implementation manner, the fourth information further includes an identifier of the target host node and / or a triggering method of the DU migration, including:

[0492] When the second trigger condition includes the relay node receiving the fifth information from the first host node and / or the sixth information provided by the network management, the fourth information also includes the identifier of the target host node and / or the triggering method of the DU migration.

[0493] In the implementation manner of the present application, the relay node receives the fifth information from the first host node, which is equivalent to the first host node instructing the relay node to establish an F1 interface (CU trigger) with the target host node. Since in the implementation manner of the present application, in the case of a trigger conflict, the CU trigger shall prevail. Therefore, when a trigger conflict occurs and the indication information (fifth information) of the CU trigger is received, sending the fourth information to OAM enables OAM to update the connection relationship of the IAB node in a timely manner, which is convenient for subsequent management. Based on the sixth information provided by the network management, it is equivalent to a trigger conflict, and the indications of the CU trigger and the OAM trigger are different (for example, the target host node is different from the second host node). In this case, sending the fourth information to OAM can also enable OAM to update the connection relationship of the IAB node in a timely manner, which is convenient for subsequent management.

[0494] See also Fig.13 , Fig.13 This is a flow chart of another communication method provided in an embodiment of the present application. It can be understood that the steps in the embodiment of the present application can be regarded as the above Fig.12 or, it can be understood that the communication method in the embodiment of the present application can also be regarded as an embodiment that can be executed independently, and the present application does not limit this. The communication method provided in the embodiment of the present application is applied to the field of communication technology, such as communication of IAB network.

[0495] It is understood that the IAB (including IAB-DU and IAB-MT) involved in the communication method provided in the embodiment of the present application can refer to the above Fig.12 The relay node in the communication method shown, CU1 can refer to the above Fig.12 The first host node in the communication method shown in the embodiment of the present application and the CU3 involved in the communication method provided in the embodiment of the present application can refer to the above Fig.12 The target host node in the communication method shown in the figure, the CU4 involved in the communication method provided in the embodiment of the present application can refer to the above Fig.12 The second host node in the communication method shown in the embodiment of the present application may refer to the above OAM involved in the communication method provided in the embodiment of the present application. Fig.12 The OAM server in the communication method shown is not described in detail here.

[0496] The communication method may include one or more steps from step 1 to step 5. It should be understood that for the convenience of description, the description is given in the order of steps 1 to 5, and it is not intended to limit the execution to the above order. The embodiment of the present application does not limit the execution order, execution time, and number of executions of the above one or more steps. Steps 1 to 5 are as follows:

[0497] Step 1. CU triggers DU migration.

[0498] Specifically, CUI sends an F1AP message to IAB-DU1 to instruct IAB-node to perform DU migration. Correspondingly, IAB-DU1 receives the F1AP message from CU1. Optionally, the message may carry the identifier of the target CU. For example, if the target CU is CU4, the F1AP message may carry the gNB ID and / or IP address of CU4.

[0499] Step 2. IAB-DU2 initiates an F1 interface establishment request to CU4. Correspondingly, CU4 also receives the F1 interface establishment request sent by IAB-DU2.

[0500] For example, IAB-DU2 may initiate an F1 interface establishment request to CU4 via an F1AP message, where the F1AP message may be, for example, an F1 SETUP REQUEST message. Optionally, the F1AP message may carry an identifier of IAB-DU2, such as a gNB ID and / or an IP address.

[0501] Step 3. OAM triggers DU migration.

[0502] It is understandable that OAM triggers DU migration, which can be triggered by pre-configuration or by remote control. Figure 8 The description of OAM triggering in the description is not repeated here.

[0503] The OAM trigger indicates that the target CU of the DU migration of the IAB-node is CU3. It should be noted that OAM triggers DU migration, which usually refers to the indication information from the OAM server used to indicate that the IAB-node is or will perform DU migration. Correspondingly, the IAB-node receives the indication information from the OAM server and prepares or is generating the indication information (for example, F1 SETUP RESQUEST) requesting DU migration. Alternatively, based on the OAM trigger, the IAB-node determines to perform DU migration, and the target CU is CU3.

[0504] Step 4: CU4 sends a message to IAB-DU2 indicating that the establishment of the F1 interface is completed. Correspondingly, IAB-DU2 also receives a message from CU4 indicating that the establishment of the F1 interface is completed.

[0505] For example, CU4 may send a message indicating that establishment of the F1 interface is completed to IAB-DU2 via an F1AP message. The F1AP message may be, for example, an F1 SETUP RESPONSE message.

[0506] Optionally, the execution order of step 3 and step 4 is not limited in the embodiment of the present application. For example, step 3 may be executed first and then step 4, or step 4 may be executed first and then step 3.

[0507] Step 5. IAB-node sends IAB node information to the OAM server.

[0508] For example, IAB-DU1 may send IAB node information to the OAM server, IAB-DU2 may send IAB node information to the OAM server, and IAB-MT may send IAB node information to the OAM server, which is not limited in this embodiment of the present application.

[0509] The IAB node message may be used to indicate the establishment result of the F1 interface, for example, indicating the establishment result of the F1 interface between the IAB-node and CU4, and the result may be, for example, that the establishment of the F1 interface is complete.

[0510] Optionally, the IAB node information may carry an identifier of CU4, such as a gNB ID and / or an IP address.

[0511] Optionally, the IAB node information may also carry a triggering mode of DU migration of the IAB-node. For example, the DU migration of the IAB-node is triggered by the CU.

[0512] Optionally, when at least one of the following conditions is met, the triggering mode of DU migration of the IAB-node may be carried in the IAB node information.

[0513] (1) The triggering method of DU migration of IAB-node is CU triggering.

[0514] (2) The target CU of DU migration of IAB-node is different from the target CU indicated by OAM trigger. For example, IAB-node establishes F1 interface with CU4 according to the instruction of CU trigger. However, the target CU indicated by OAM trigger is CU3, which is different from CU3.

[0515] Through the embodiments of the present application, it is clarified that in the event of a trigger conflict during the DU migration process, the CU trigger shall prevail. This avoids the situation where the target CU of the DU migration is uncertain due to the trigger conflict, and can ensure the smooth completion of the DU migration. In addition, sending information such as the result of the DU migration of the IAB-node to the OAM server can enable the OAM server to adjust the connection relationship of the IAB-node in a timely manner, which is convenient for the OAM server to perform subsequent management of the IAB-node and the next DU migration.

[0516] Above Fig.13 In the illustrated implementation, CU triggering is earlier than OAM triggering, and CU triggering is used as the standard. However, there is also a case where OAM triggering is earlier than CU triggering, and CU triggering is used as the standard.

[0517] See next Fig.14 , Fig.14 This is a flow chart of another communication method provided in an embodiment of the present application. It can be understood that the steps in the embodiment of the present application can be regarded as the above Fig.12 or, it can be understood that the communication method in the embodiment of the present application can also be regarded as an embodiment that can be executed independently, and the present application does not limit this. The communication method provided in the embodiment of the present application is applied to the field of communication technology, such as communication of IAB network.

[0518] It is understood that the IAB (including IAB-DU and IAB-MT) involved in the communication method provided in the embodiment of the present application can refer to the above Fig.12 The relay node in the communication method shown, CU1 can refer to the above Fig.12 The first host node in the communication method shown in the embodiment of the present application and the CU3 involved in the communication method provided in the embodiment of the present application can refer to the above Fig.12 The target host node in the communication method shown in the figure, the CU4 involved in the communication method provided in the embodiment of the present application can refer to the above Fig.12 The second host node in the communication method shown in the embodiment of the present application may refer to the above OAM involved in the communication method provided in the embodiment of the present application. Fig.12 The OAM server in the communication method shown is not described in detail here.

[0519] The communication method may include one or more steps from step 1 to step 9. It should be understood that for the convenience of description, the description is given in the order of steps 1 to 9, and it is not intended to limit the execution to the above order. The embodiment of the present application does not limit the execution order, execution time, and number of executions of the above one or more steps. Steps 1 to 9 are as follows:

[0520] Step 1. OAM triggers DU migration.

[0521] It is understandable that OAM triggers DU migration, which can be triggered by pre-configuration or by remote control. Figure 8 The description of OAM triggering in the description is not repeated here.

[0522] The OAM trigger indicates that the target CU of the DU migration of the IAB-node is CU3. It should be noted that OAM triggers DU migration, which usually refers to the indication information from the OAM server used to indicate that the IAB-node is or will perform DU migration. Correspondingly, the IAB-node receives the indication information from the OAM server and prepares or is generating the indication information (for example, F1 SETUP RESQUEST) requesting DU migration. Alternatively, based on the OAM trigger, the IAB-node determines to perform DU migration, and the target CU is CU3.

[0523] Step 2. IAB-DU2 sends an F1 interface establishment request (eg, F1 SETUP REQUEST) to CU3. Correspondingly, CU3 also receives the F1 interface establishment request from IAB-DU2.

[0524] Step 3: CU3 sends a message (such as F1 SETUP RESPONSE) to IAB-DU2 indicating that the establishment of the F1 interface is completed. Correspondingly, IAB-DU2 also receives a message from CU3 indicating that the establishment of the F1 interface is completed.

[0525] Step 4. CU triggers DU migration. Specifically, CU1 sends an indication message of CU triggering DU migration to IAB-DU1. The message may be carried in an F1AP message, indicating that the target CU of DU migration is CU4. Optionally, the message may carry an identifier of CU4, such as a gNB ID and / or IP address.

[0526] Optionally, the execution order of step 3 and step 4 is not limited in the embodiment of the present application. For example, step 3 may be executed first and then step 4, or step 4 may be executed first and then step 3.

[0527] Step 5. IAB-DU2 sends an F1 interface release request to CU3. Correspondingly, CU3 also receives the F1 interface release request from IAB-DU2.

[0528] After receiving the OAM-triggered indication information, IAB-DU2 knows that it needs to follow the OAM-triggered indication information, so IAB-DU2 sends an F1 interface release request to CU3. CU3 needs to release the F1 interface so that IAB-DU2 can establish an F1 interface with the CU of other host nodes.

[0529] The F1 interface release request may be carried in an F1AP message, such as an F1 REMOVAL REQUEST message.

[0530] Step 6: CU3 sends a message indicating that the F1 interface is released to IAB-DU2. Correspondingly, IAB-DU2 also receives a message indicating that the F1 interface is released from CU3.

[0531] The information on completion of releasing the F1 interface may be carried in an F1AP message, for example, an F1 REMOVAL RESPONSE message.

[0532] Step 7. IAB-DU2 sends an F1 interface establishment request to CU4. Correspondingly, CU4 also receives the F1 interface establishment request sent by IAB-DU2.

[0533] After IAB-DU2 receives the information of completing the release of the F1 interface from CU4, IAB-DU2 may send information of requesting the establishment of the F1 interface to CU4.

[0534] Optionally, the message may be carried in an F1AP message, for example, an F1 SETUP REQUEST message.

[0535] Step 8. CU4 sends a message to IAB-DU2 indicating that the establishment of the F1 interface is completed. Correspondingly, IAB-DU2 also receives a message from CU4 indicating that the establishment of the F1 interface is completed.

[0536] Optionally, the information may be carried in an F1AP message, for example, an F1 SETUP RESPONSE message.

[0537] Step 9. IAB-node sends IAB node information to the OAM server.

[0538] For example, IAB-DU1 may send IAB node information to the OAM server, IAB-DU2 may send IAB node information to the OAM server, and IAB-MT may send IAB node information to the OAM server, which is not limited in this embodiment of the present application.

[0539] The IAB node message may be used to indicate the establishment result of the F1 interface, for example, indicating the establishment result of the F1 interface between the IAB-node and CU4, and the result may be, for example, that the establishment of the F1 interface is complete.

[0540] Optionally, the IAB node information may carry an identifier of CU4, such as a gNB ID and / or an IP address.

[0541] Optionally, the IAB node information may also carry a triggering mode of DU migration of the IAB-node. For example, the DU migration of the IAB-node is triggered by the CU.

[0542] Optionally, when at least one of the following conditions is met, the triggering mode of DU migration of the IAB-node may be carried in the IAB node information.

[0543] (1) The triggering method of DU migration of IAB-node is CU triggering.

[0544] (2) The target CU of DU migration of IAB-node is different from the target CU indicated by OAM trigger. For example, IAB-node establishes F1 interface with CU4 according to the instruction of CU trigger. However, the target CU indicated by OAM trigger is CU3, which is different from CU3.

[0545] Through the embodiments of the present application, it is clarified that in the event of a trigger conflict during the DU migration process, the CU trigger shall prevail. This avoids the situation where the target CU of the DU migration is uncertain due to the trigger conflict, and can ensure the smooth completion of the DU migration. In addition, sending information such as the result of the DU migration of the IAB-node to the OAM server can enable the OAM server to adjust the connection relationship of the IAB-node in a timely manner, which is convenient for the OAM server to perform subsequent management of the IAB-node and the next DU migration.

[0546] See also Fig.15 , Fig.15 A flow chart of another communication method provided in an embodiment of the present application. The communication method is applied to the field of communication technology, such as communication of an IAB network, and the communication method includes but is not limited to the following steps:

[0547] S1501: The first host node sends the eighth information to the relay node, and correspondingly, the relay node also receives the eighth information from the first host node.

[0548] S1502: The relay node sends the ninth information to the first host node, and correspondingly, the first host node also receives the ninth information from the relay node.

[0549] For more information about relay nodes, first host nodes, second host nodes, target host nodes, and OAM servers, please refer to Fig. 9 or Fig.12 The relevant description in will not be repeated here.

[0550] Among them, the above-mentioned eighth information is used to instruct the relay node to perform DU migration, and may include an identifier of the host node after migration, such as a gNB ID and / or IP address.

[0551] The ninth information is used to instruct the relay node to refuse to perform the DU migration indicated by the CU trigger, and is used to let the first host node know that the relay node does not perform the DU migration according to its own instructions.

[0552] Optionally, the eighth information and the ninth information mentioned above can both be carried in the F1AP message.

[0553] In the implementation mode of the present application, when the relay node receives the indication information triggered by CU, it directly gives the indication information of refusing to migrate, so that the relay node can only perform the DU migration operation based on the indication information triggered by OAM, thereby avoiding the conflict between DU triggering and OAM triggering.

[0554] In a possible implementation manner, the ninth information includes the reason why the relay node refuses to perform the DU migration.

[0555] In the implementation manner of the present application, the reason for refusing to perform DU migration may be, for example, that the relay node only accepts OAM triggering, or that the relay node does not support CU triggering, etc., and the implementation manner of the present application does not limit this. By giving the reason for refusing to perform DU migration, the first relay node can also know the specific reason for refusing to perform DU migration this time and record it. On the one hand, it can avoid the first host node instructing the relay node to perform DU migration again. On the other hand, it can also allow the first host node to understand the situation of the relay node more clearly. The relay node refuses to perform DU migration because it does not support CU triggering or only supports OAM triggering. Instead of the relay node refusing to perform DU migration for some reason, such as an abnormality in the relay node itself, or the relay node is temporarily unable to perform DU migration, etc.

[0556] Optionally, the ninth information can be carried in the class 1RESPONSE message or REJECT / FAILURE message of the F1AP message triggered by the CU, or in a separate class 2 message. Among them, the processes in F1AP are divided into class 1 and class 2. The class 1 process refers to the situation where feedback is required in the same process, such as: F1SETUP REQEUST--F1 SETUP RESPONSE / F1 SETUP FAILURE, GNB-DU CONFIGURATIONUPDATE--GNB-DU CONFIGURATION UPDATE ACK / GNB-DU CONFIGURATION UPDATE FAILURE, etc., while the class 2 process refers to the process with only one message in the process and does not require feedback of the F1AP message, such as: UL RRCMESSAGE TRANSFER, DL RRC MESSAGE TRANSFER, etc.

[0557] See also Fig.16 , Fig.16 The flowchart of a communication method provided in the embodiment of the present application is shown in FIG. Fig.15 or, it can be understood that the communication method in the embodiment of the present application can also be regarded as an embodiment that can be executed independently, and the present application does not limit this. The communication method provided in the embodiment of the present application is applied to the field of communication technology, such as communication of IAB network.

[0558] It is understood that the IAB (including IAB-DU and IAB-MT) involved in the communication method provided in the embodiment of the present application can refer to the above Fig.15 The relay node in the communication method shown, CU1 can refer to the above Fig.15 The first host node in the communication method shown in the embodiment of the present application and the CU3 involved in the communication method provided in the embodiment of the present application can refer to the above Fig.15 The target host node in the communication method shown in the figure, the CU4 involved in the communication method provided in the embodiment of the present application can refer to the above Fig.15 The second host node in the communication method shown in the embodiment of the present application may refer to the above OAM involved in the communication method provided in the embodiment of the present application. Fig.15 The OAM server in the communication method shown is not described in detail here.

[0559] The communication method may include one or more steps from step 1 to step 2. It should be understood that for the convenience of description, the order of step 1 to step 2 is described here, and it is not intended to limit the execution to the above order. The embodiment of the present application does not limit the execution order, execution time, and number of executions of the above one or more steps. Steps 1 to 2 are as follows:

[0560] Step 1. CU1 sends CU-triggered DU migration indication information to IAB-DU. Correspondingly, IAB-DU also receives CU-triggered DU migration indication information from CUI.

[0561] Specifically, CU1 sends the indication information of CU triggering DU migration to IAB-DU. This message may be carried in an F1AP message, such as MIAB F1 SETUP TRIGGERING message.

[0562] Optionally, the indication information may carry that the target CU of DU migration is CU3 or CU4, etc., which is not limited in the embodiment of the present application.

[0563] Optionally, when the CU triggers the indication DU to migrate to the target CU (e.g., CU4), the message may carry an identifier of the target CU, such as a gNB ID and / or IP address.

[0564] Step 2: The IAB-DU sends indication information of rejecting CU triggering to CU1. Correspondingly, CU1 also receives indication information of rejecting CU triggering from the IAB-DU.

[0565] Among them, the above-mentioned indication information of rejecting CU triggering can be carried in the class1RESPONSE message or REJECT / FAILURE message of the F1AP message triggered by the CU, or can be carried in a separate class 2 message. Among them, the processes in F1AP are divided into class 1 and class 2. The class 1 process refers to the situation where feedback is required in the same process, such as: F1 SETUP REQEUST--F1 SETUP RESPONSE / F1 SETUP FAILURE, GNB-DUCONFIGURATION UPDATE--GNB-DU CONFIGURATION UPDATE ACK / GNB-DU CONFIGURATIONUPDATE FAILURE, etc., while the class 2 process refers to the process with only one message in the process and does not require feedback of the F1AP message, such as: UL RRC MESSAGE TRANSFER, DL RRC MESSAGE TRANSFER, etc. For example, the message in step 2 can be carried in MIAB F1 SETUP OUTCOME NOTIFICATION.

[0566] Optionally, the above indication information may also carry a reason for rejecting DU migration, for example, the IAB-node only accepts DU migration triggered by OAM.

[0567] In the implementation mode of the present application, when the relay node receives the indication information triggered by CU, it directly gives the indication information of refusing to migrate, so that the relay node can only perform the DU migration operation based on the indication information triggered by OAM, thereby avoiding the conflict between DU triggering and OAM triggering.

[0568] Above Fig.15 and Fig.16 The embodiment shown is used to show the situation where the IAB-node only accepts OAM-triggered DUmigration. Fig.17 and Fig.18 Used to display the situation where only CU triggers DU migration.

[0569] See also Fig.17 , Fig.17 A flow chart of another communication method provided in an embodiment of the present application. The communication method is applied to the field of communication technology, such as communication of an IAB network, and the communication method includes but is not limited to the following steps:

[0570] S1701: The OAM server sends the tenth information to the relay node.

[0571] S1702 (optional): The relay node ignores the tenth information.

[0572] S1703 (optional): The relay node sends the eleventh information to the OAM server.

[0573] For more information about relay nodes, first host nodes, second host nodes, target host nodes, and OAM servers, please refer to Fig. 9 or Fig.12 The relevant description in will not be repeated here.

[0574] Among them, the tenth information may be information pre-configured by the network manager on the relay node, or information sent by the network manager to the relay node through remote control. For the introduction of pre-configuration and remote control, please refer to the above description, which will not be repeated here. The tenth information may include the identifier of the host node after the relay node is migrated, for example, the gNB ID and / or IP address, etc. The tenth information may also include information such as the time when the relay node performs DU migration.

[0575] Among them, DU ignores (ignores) the tenth information, which may be that the relay node refuses to receive the pre-configuration information of the network manager; it may also be that when the relay node is pre-configured by the network manager, the pre-configuration information is deleted; it may also be that when the pre-configuration information indicates that the relay node needs to migrate, the relay node ignores the indication and does not perform DU migration according to the indication of the pre-configuration information; it may also be that the DU migration triggered by the network manager through remote control is ignored.

[0576] In the IAB network, the DU migration of the IAB node supports two triggering modes: source CU triggering and OAM triggering. In the source CU triggering (hereinafter referred to as "CU triggering") mode, the source CU will send an indication message carrying the target CU to the DU in the IAB node, and the DU will complete the migration operation based on the indication message. The source CU is the CU connected to the DU before the migration, and the target CU is the CU connected to the DU after the migration. In the OAM triggering mode, the OAM server can be directly pre-configured in the IAB node or remotely trigger the IAB node to perform DU migration. Obviously, both CU triggering and OAM triggering can instruct the relay node to perform DU migration. If the CU triggering and OAM triggering occur at the same time, the relay node may not be able to complete the DU migration normally, or may migrate to the wrong host node. In addition, in the case of a conflict between the two triggers, at least one trigger indication (such as CU triggering) is not completed, which may also cause abnormalities such as control failure and information transmission errors.

[0577] In the implementation manner of the present application, when the OAM-triggered indication information instructs the relay node to perform DU migration, the relay node ignores the OAM-triggered indication information, so that the relay node only executes the CU-triggered indication information, thereby avoiding the conflict between CU triggering and OAM triggering, and then ensuring that the relay node completes the DU migration normally.

[0578] In a possible implementation manner, the relay node sends eleventh information to the network manager, where the eleventh information is used to indicate rejection of DU migration triggered by the network manager or to indicate that the network manager does not trigger DU migration of the relay node.

[0579] The OAM server knows that the DU migration it has instructed has not been executed by the relay node, so that the OAM server can avoid adjusting the connection relationship of the relay node according to the instruction information triggered by OAM. Informing the OAM server not to trigger DU migration can also save some control resources and avoid conflicts between OAM triggering and CU triggering.

[0580] Optionally, the relay node sends indication information to the OAM server, where the indication information is used to instruct the relay node to establish an F1 interface with the target host node.

[0581] When the relay node ignores the indication information triggered by OAM, if it performs DU migration according to the indication information triggered by CU and informs the OAM server of the relay node DU migration, the OAM server can update the connection relationship of the relay node in time, thereby facilitating the OAM server to perform subsequent management of the relay node.

[0582] See also Fig.18 , Fig.18 The flowchart of a communication method provided in the embodiment of the present application is shown in FIG. Fig.17 or, it can be understood that the communication method in the embodiment of the present application can also be regarded as an embodiment that can be executed independently, and the present application does not limit this. The communication method provided in the embodiment of the present application is applied to the field of communication technology, such as communication of IAB network.

[0583] It is understood that the IAB (including IAB-DU and IAB-MT) involved in the communication method provided in the embodiment of the present application can refer to the above Fig.17 The relay node in the communication method shown, CU1 can refer to the above Fig.17 The first host node in the communication method shown in the embodiment of the present application and the CU3 involved in the communication method provided in the embodiment of the present application can refer to the above Fig.17The target host node in the communication method shown in the figure, the CU4 involved in the communication method provided in the embodiment of the present application can refer to the above Fig.17 The second host node in the communication method shown in the embodiment of the present application may refer to the above OAM involved in the communication method provided in the embodiment of the present application. Fig.17 The OAM server in the communication method shown is not described in detail here.

[0584] The communication method may include one or more steps from step 1 to step 2. It should be understood that for the convenience of description, the order of step 1 to step 2 is described here, and it is not intended to limit the execution to the above order. The embodiment of the present application does not limit the execution order, execution time, and number of executions of the above one or more steps. Steps 1 to 2 are as follows:

[0585] In the introduction Fig.18 Before executing the method shown in Fig.18 Explain the possible prerequisites for the method. For example, Fig.18 Before the method shown, the IAB-node needs to receive the OAM trigger, or the OAM server needs to send the indication information of the OAM trigger to the IAB-node.

[0586] Step 1. IAB-node ignores OAM trigger (Option 1).

[0587] After receiving the OAM trigger, the IAB-node may choose to ignore the indication information of the OAM trigger. Specifically, the OAM configuration may be always ignored. For example, when the IAB-node receives a message sent by the OAM server, it may directly ignore it. For another example, it may ignore the DU migration policy pre-configured by the OAM server.

[0588] Optionally, the OAM-triggered indication information is ignored, for example, DUmigration may not be performed according to the OAM-triggered indication information, or information may not be replied to the OAM server according to the OAM-triggered indication information.

[0589] Step 2. IAB-node sends IAB node information (Option 2) to the OAM server.

[0590] Among them, the IAB node message can be used to instruct the IAB-node to refuse to execute the OAM trigger indication information, and can also be used to instruct the OAM server not to trigger the DUmigration of the IAB-node, including: it can be that the DUmigration of the IAB-node is not triggered for a period of time, and it can also be that the DUmigration of the IAB-node is not triggered permanently.

[0591] It should be noted that the execution order of the above steps 1 and 2 is not limited in the embodiment of the present application. For example, step 1 may be executed first and then step 2, or step 2 may be executed first and then step 1. In addition, the above steps 1 and 2 may be regarded as two parallel methods, that is, only one of the steps may be executed, for example, only step 1 or only step 2.

[0592] The implementation mode of the present application, by ignoring the OAM trigger or sending an IAB node message to the OAM server, instructs the OAM server not to trigger the DU migration of the IAB-node, so that the relay node can only perform the DU migration operation based on the indication information triggered by the CU, thereby avoiding the situation where the DU trigger and the OAM trigger conflict. In addition, the OAM server can also know that the DU migration indicated by it is not executed by the relay node, thereby avoiding the OAM server from timely adjusting the connection relationship of the relay node according to the indication information triggered by the OAM, which is convenient for the subsequent management of the OAM.

[0593] See also Fig.19 , Fig.19 A flow chart of another communication method provided in an embodiment of the present application. The communication method is applied to the field of communication technology, such as communication of an IAB network, and the communication method includes but is not limited to the following steps:

[0594] S1901: The relay node sends twelfth information to the first host node, and correspondingly, the relay node receives the twelfth information from the first host node.

[0595] S1902: The first host node sends the thirteenth information to the relay node, and correspondingly, the first host node receives the thirteenth information from the relay node.

[0596] Fig.19 The relay node, the first host node, the second host node, the target host node and the OAM server shown in the method can refer to Fig. 9 or Fig.12 The relevant description will not be repeated here.

[0597] Specifically, the above S1901 and / or S1902 are executed when the following triggering conditions are met:

[0598] When the third trigger condition is met, the relay node generates the twelfth information. At this time, the third trigger condition can be understood as the condition that triggers the relay node to generate the twelfth information. Optionally, when the above third trigger condition is met, the relay node will also send the twelfth information. At this time, the third trigger condition can be understood as the condition that triggers the relay node to generate and send the twelfth information. Optionally, when the third trigger condition is met, the first host node generates the thirteenth information. At this time, the third trigger condition can be understood as the condition that triggers the first host node to generate the thirteenth information. Optionally, when the above third trigger condition is met, the first host node will also send the thirteenth information. At this time, the third trigger condition can be understood as the condition that triggers the first host node to generate and send the thirteenth information.

[0599] The third trigger condition includes but is not limited to one or more of the following:

[0600] (1) The relay node completes network access.

[0601] (2) The relay node completes DU migration.

[0602] It should be understood that the several trigger conditions listed above are merely possible illustrative descriptions of triggering the execution of S1901 and / or S1902, and should not be used to limit the embodiments of the present application. Embodiments obtained based on the supplement or reasonable deformation of the above-mentioned trigger conditions all fall within the scope of protection of the embodiments of the present application.

[0603] The twelfth and thirteenth information are used to indicate the triggering mode of DU migration supported by the relay node, for example, only supporting CU triggering, only supporting OAM triggering, or supporting both CU triggering and OAM triggering. In the case where the relay node supports both CU triggering and OAM triggering, the priority of CU triggering and OAM triggering can also be set, for example, OAM triggering is used as the priority (equivalent to Fig. 9 ), or based on the CU trigger (equivalent to Fig.12 method shown).

[0604] Optionally, the twelfth information may be carried in a class 1 process of F1AP, such as an F1 SETUPREQUEST message or a GNB-DU CONFIGURATION UPDATE message. It may also be carried in a class 2 process of F1AP, and the specific message used is not limited in the embodiment of the present application.

[0605] Optionally, the thirteenth information may be carried in a class 1 process of F1AP, such as an F1 SETUPRESPONSE message or a GNB-CU CONFIGURATION UPDATE message. It may also be carried in a class 2 process of F1AP, and the specific message used is not limited in the embodiment of the present application.

[0606] Optionally, the above S1901 and / or S1902 is performed when at least one of the following conditions is met. Including:

[0607] (1) The above relay nodes complete network access.

[0608] (2) The above relay node completes DU migration.

[0609] The completion of the relay node entering the network generally means that the parent node of the relay node is already in the network, and the relay node and the host node in the network complete the establishment of the F1 interface. Alternatively, the relay node can provide services for the UE or the next-hop MT.

[0610] The relay node completes the DU migration, which may be that the relay node establishes a new F1 interface with a new host node, and the UE of the relay node has switched to the new DU and released the old F1 interface.

[0611] In a possible implementation manner, the triggering modes supported by the DU migration include CU triggering and / or network management triggering.

[0612] When the above triggering method includes only CU triggering or only network management triggering, the relay node can avoid triggering conflicts and ensure that the relay node completes DU migration normally. Figure 9-14 The provided method handles possible conflicts to ensure that the relay node completes DU migration normally.

[0613] See also Fig. 20 , Fig. 20 The flowchart of a communication method provided in the embodiment of the present application is shown in FIG. Fig.19 or, it can be understood that the communication method in the embodiment of the present application can also be regarded as an embodiment that can be executed independently, and the present application does not limit this. The communication method provided in the embodiment of the present application is applied to the field of communication technology, such as communication of IAB network.

[0614] It is understood that the IAB (including IAB-DU and IAB-MT) involved in the communication method provided in the embodiment of the present application can refer to the above Fig.19The relay node in the communication method shown, CU1 can refer to the above Fig.19 The first host node in the communication method shown in the embodiment of the present application and the CU3 involved in the communication method provided in the embodiment of the present application can refer to the above Fig.19 The target host node in the communication method shown in the figure, the CU4 involved in the communication method provided in the embodiment of the present application can refer to the above Fig.19 The second host node in the communication method shown in the embodiment of the present application may refer to the above OAM involved in the communication method provided in the embodiment of the present application. Fig.19 The OAM server in the communication method shown is not described in detail here.

[0615] The communication method may include one or more steps from step 1 to step 2. It should be understood that for the convenience of description, the order of step 1 to step 2 is described here, and it is not intended to limit the execution to the above order. The embodiment of the present application does not limit the execution order, execution time, and number of executions of the above one or more steps. Steps 1 to 2 are as follows:

[0616] Step 1. CU1 sends F1AP information to IAB-DU. Correspondingly, IAB-DU also receives F1AP information (Option 1) from CU1.

[0617] The F1AP information is used to indicate the triggering mode of DU migration that the IAB-node can receive. For example, the IAB-node can be indicated to support CU triggering, the IAB-node can be indicated to support OAM triggering, or the IAB-node can be indicated to support both CU triggering and OAM triggering. In addition, when the IAB-node is indicated to support both CU triggering and OAM triggering, the priority of CU triggering and OAM triggering can also be indicated.

[0618] Optionally, the F1AP message may be carried in a class 1 message, such as an F1 SETUPRESPONSE message or a GNB-CU CONFIGURATION UPDATE message.

[0619] Step 2. IAB-DU sends F1AP information to CU1. Correspondingly, CU1 receives information from IAB-DU (Option 2).

[0620] The F1AP information is used to indicate the triggering mode of DU migration that the IAB-node can receive. For example, the IAB-node can be indicated to support CU triggering, the IAB-node can be indicated to support OAM triggering, or the IAB-node can be indicated to support both CU triggering and OAM triggering. In addition, when the IAB-node is indicated to support both CU triggering and OAM triggering, the priority of CU triggering and OAM triggering can also be indicated.

[0621] Optionally, the F1AP message may be carried in a class 1 message, such as an F1 SETUPREQUEST message or a GNB-DU CONFIGURATION UPDATE message.

[0622] It should be noted that the execution order of the above steps 1 and 2 is not limited in the embodiment of the present application. For example, step 1 may be executed first and then step 2, or step 2 may be executed first and then step 1. In addition, the above steps 1 and 2 may be regarded as two parallel methods, that is, only one of the steps may be executed, for example, only step 1 or only step 2.

[0623] In the embodiment of the present application, by setting the triggering mode of DU migration supported by IAB-node, the generation of CU triggering conflict can be reduced, thereby ensuring that IAB-node successfully completes DU migration. In the case where IAB-node supports two triggering modes, it can also be executed Figures 9 to 14 The method shown determines the target CU of DU migration when a conflict occurs, thereby ensuring that the IAB-node successfully completes the DU migration.

[0624] See also Fig.21 , Fig.21 A flow chart of another communication method provided in an embodiment of the present application. The communication method is applied to the field of communication technology, such as communication of an IAB network, and the communication method includes but is not limited to the following steps:

[0625] S2101: The first host node generates fourteenth information.

[0626] S2102: The first host node sends fourteenth information to the second host node.

[0627] Fig.21 For an introduction to the relay node, the first host node, the second host node, the target host node, and the OAM server shown in the method, see Fig. 9 or Fig.12 The relevant description will not be repeated here.

[0628] Specifically, the above S2101 and / or S2102 are executed when the following triggering conditions are met:

[0629] When the fourth trigger condition is met, the first host node generates the fourteenth information, and the fourth trigger condition can be understood as a condition that triggers the first host node to generate the fourteenth information. Optionally, when the fourth trigger condition is met, the first host node also sends the fourteenth information, and the fourth trigger condition can be understood as a condition that triggers the relay node to generate and send the fourteenth information.

[0630] The fourth trigger condition includes but is not limited to one or more of the following:

[0631] (1) The first host node receives indication information from the relay node, where the indication information is used to indicate that the relay node has completed establishing the F1 interface with the target host node.

[0632] (2) There is interaction between the first host node and the second host node.

[0633] (3) There is a pre-configuration in the second host node, and the pre-configuration is used to instruct the second host node to establish an F1 interface with the relay node.

[0634] Optionally, condition 2 and condition 3 occur during the DU migration process of the IAB-node.

[0635] It should be understood that the several trigger conditions listed above are merely possible illustrative descriptions of triggering the execution of S2101 and / or S2102, and should not be used to limit the embodiments of the present application. Embodiments obtained based on the supplement or reasonable deformation of the above-mentioned trigger conditions all fall within the scope of protection of the embodiments of the present application.

[0636] The fourteenth information is used to instruct to cancel the establishment of the F1 interface between the second host node and the relay node, so as to avoid abnormal situations caused by the second host node trying to establish the F1 interface with the relay node again. In addition, the second host node can use effective resources to establish the F1 interface with other relay nodes.

[0637] Optionally, the fourteenth information may carry an identifier of the target host node, such as a gNB ID and / or an IP address.

[0638] In the implementation manner of the present application, when the fourth trigger condition is met, the first host node sends the fourteenth information to the second host node, and the fourteenth information is used to instruct to cancel the establishment of the F1 interface between the second host node and the relay node, so as to avoid the abnormal situation caused by the second host node trying to establish the F1 interface with the relay node again. In addition, the second host node can also use effective resources to establish the F1 interface with other relay nodes.

[0639] about Fig.21 For a specific implementation of the method shown, please refer to Fig.10 The description of step 6 in the above is not repeated here.

[0640] The above describes in detail the method of the embodiments of the present application. The following provides an apparatus for implementing any method in the embodiments of the present application. For example, an apparatus is provided including units (or means) for implementing each step performed by the device in any of the above methods.

[0641] like Fig. 22 As shown, the communication device 220 may include a processing unit 2201 and a communication unit 2202. The processing unit 2201 and the communication unit 2202 may be software, hardware, or a combination of software and hardware.

[0642] The processing unit 2201 can implement the sending function and / or the receiving function, and the processing unit 2201 can also be described as a transceiver unit. The processing unit 2201 can also be a unit integrating an acquisition unit and a sending unit, wherein the acquisition unit is used to implement the receiving function and the sending unit is used to implement the sending function. Optionally, the processing unit 2201 can be used to receive information sent by other devices, and can also be used to send information to other devices.

[0643] In one possible design, the communication device 220 may correspond to the above Figure 9-Figure 21 The relay node in the method embodiment shown in the figure, such as the communication device 220, can be a relay node, or a chip in the relay node. The communication device 220 can include a chip for performing the above Figure 9-Figure 21 In the method embodiment shown, the units of the operation performed by the first host node, and the units in the communication device 220 are respectively for implementing the above Figure 9-Figure 21 The operations performed by the first host node in the method embodiment shown are described as follows:

[0644] The processing unit 2201 is configured to generate first information when a first trigger condition is met; the first information includes a result of the relay node establishing the first F1 interface with the target host node and an identifier of the target host node; or, the first information includes a result of the relay node establishing the first F1 interface with the target host node, an identifier of the target host node, and a triggering method for DU migration of the relay node;

[0645] The first trigger condition includes at least one of the following:

[0646] Based on second information provided by the network management, the second information is used to instruct the relay node to establish the first F1 interface with the target host node; or, the relay node receives third information from the first host node, and the third information is used to instruct the relay node to establish a second F1 interface with a second host node, and the second host node is different from the target host node.

[0647] The communication unit 2202 is used to send the first information.

[0648] or,

[0649] The processing unit 2201 is configured to generate fourth information; the fourth information includes a result of the relay node establishing a third F1 interface with the target host node.

[0650] The communication unit 2202 is used to send the fourth information to the network management.

[0651] or,

[0652] The processing unit 2201 is configured to generate the fourth information when the second trigger condition is met;

[0653] The second trigger condition includes at least one of the following:

[0654] The relay node receives fifth information from the first host node, and the fifth information is used to instruct the relay node to establish the third F1 interface with the target host node; or, based on sixth information provided by the network management, the sixth information is used to instruct the relay node to establish a fourth F1 interface with the second host node, and the second host node is different from the target host node; or, the relay node receives seventh information from the target host node, and the seventh information is used to indicate that the establishment of the third F1 interface is completed.

[0655] The communication unit 2202 is used to send the fourth information to the network management.

[0656] or,

[0657] The processing unit 2201 is used to generate ninth information, where the ninth information is used to instruct the relay node to refuse to perform the DU migration.

[0658] The communication unit 2202 is configured to send ninth information to the first host node. In addition, the communication unit 2202 is further configured to receive eighth information from the first host node, where the eighth information is used to instruct the relay node to perform DU migration.

[0659] or,

[0660] The processing unit 2201 is configured to process the tenth information, for example, ignore the tenth information.

[0661] The communication unit 2202 is used to receive tenth information from the network management, where the tenth information is used to instruct the relay node to perform DU migration.

[0662] or,

[0663] The processing unit 2201 is used to generate twelve pieces of information;

[0664] The twelfth information is used to indicate the triggering method of DU migration supported by the relay node; and / or, processing the thirteenth information from the first host node, the thirteenth information is used to indicate the triggering method of DU migration supported by the relay node; the triggering method includes CU triggering and / or network management triggering.

[0665] The communication unit 2202 is configured to send the twelfth information and / or receive the thirteenth information.

[0666] or,

[0667] The processing unit 2201 is configured to generate fourteenth information when the fourth trigger condition is met; the fourteenth information is used to indicate cancellation of establishing the F1 interface between the second host node and the relay node;

[0668] Wherein, the fourth trigger condition includes:

[0669] The fifteenth information is received from the relay node, wherein the fifteenth information includes that the relay node completes the establishment of an F1 interface with a target host node, and the target host node is different from the second host node.

[0670] The communication unit 2202 is used to send fourteenth information when the fourth trigger condition is met.

[0671] The method performed by the processing unit 2201 and the communication unit 2202 can be referred to in the above Figure 9-Figure 21 The corresponding methods will not be described here.

[0672] For the technical effects of any of the above designs and any possible implementation methods, please refer to the above Figure 9-Figure 21 The introduction of the technical effects of the corresponding methods will not be repeated here.

[0673] Optionally, in the communication device described in any of the above designs and any of the possible implementation modes:

[0674] In one implementation, the communication device is a communication device. When the communication device is a communication device, the communication unit may be a transceiver, or an input / output interface; the processing unit may be at least one processor. Optionally, the transceiver may be a transceiver circuit. Optionally, the input / output interface may be an input / output circuit.

[0675] In another implementation, the communication device is a chip (system) or circuit used in a communication device. When the communication device is a chip (system) or circuit used in a communication device, the communication unit may be a communication interface (input / output interface), interface circuit, output circuit, input circuit, pin or related circuit on the chip (system) or circuit; the processing unit may be at least one processor, processing circuit or logic circuit.

[0676] According to the embodiment of the present application, Fig. 22 The various units in the device shown can be separately or all combined into one or several other units to constitute, or some of the units (some) can also be split into multiple smaller units in function to constitute, which can achieve the same operation without affecting the realization of the technical effects of the embodiments of the present application. The above-mentioned units are divided based on logical functions. In practical applications, the functions of one unit can also be implemented by multiple units, or the functions of multiple units can be implemented by one unit. In other embodiments of the present application, other units can also be included based on the electronic device. In practical applications, these functions can also be implemented with the assistance of other units, and can be implemented by the collaboration of multiple units.

[0677] It should be noted that the implementation of each unit can also refer to the above Figure 9-Figure 21 The corresponding description of the method embodiment shown.

[0678] exist Fig. 22 In the described communication device 220, the occurrence of trigger conflicts can be avoided, or when there are trigger conflicts, the target CU of DU migration can be determined, thereby ensuring smooth completion of DU migration.

[0679] In another possible design, the communication device 220 may correspond to the above Figure 9-Figure 21 The first host node in the method embodiment shown in the figure, such as the communication device 220, can be the first host node, or a chip in the first host node. The communication device 220 can include a device for executing the above Figure 9-Figure 16 , Figure 19-21 In the method embodiment shown, the units of the operation performed by the first host node, and the units in the communication device 220 are respectively for implementing the above Figure 9-Figure 16 , Figure 19-21The operations performed by the first host node in the method embodiment shown are described as follows:

[0680] The communication unit 2202 is used to receive first information from the relay node; the first information includes the result of the relay node establishing the first F1 interface with the target host node and the identifier of the target host node; or, the first information includes the result of the relay node establishing the first F1 interface with the target host node, the identifier of the target host node and the triggering method of the DU migration of the relay node;

[0681] The processing unit 2201 is used to process the first information.

[0682] or,

[0683] The communication unit 2202 is configured to receive fourth information from the relay node, where the fourth information includes a result of the relay node establishing a third F1 interface with the target host node.

[0684] The processing unit 2201 is configured to process the fourth information.

[0685] or,

[0686] The processing unit 2201 is used to generate eighth information, where the eighth information is used to instruct the relay node to perform DU migration.

[0687] The communication unit 2202 is used to send the eighth information to the relay node.

[0688] or,

[0689] Processing unit 2201 is used to generate thirteen information; the thirteenth information is used to indicate the triggering method of DU migration supported by the relay node; and / or, process twelfth information from the relay node, the twelfth information is used to indicate the triggering method of DU migration supported by the relay node; the triggering method includes CU triggering and / or network management triggering.

[0690] The communication unit 2202 is used to send the thirteenth information and / or receive the twelfth information.

[0691] or,

[0692] The processing unit 2201 is configured to generate fourteenth information when the fourth trigger condition is met; the fourteenth information is used to indicate cancellation of establishing the F1 interface between the second host node and the relay node;

[0693] Wherein, the fourth trigger condition includes:

[0694] The fifteenth information is received from the relay node, wherein the fifteenth information includes that the relay node completes the establishment of an F1 interface with a target host node, and the target host node is different from the second host node.

[0695] The communication unit 2202 is configured to send fourteenth information when the fourth trigger condition is met;

[0696] The method performed by the processing unit 2201 and the communication unit 2202 can be referred to in the above Figure 9-Figure 16 , Figure 19-21 The corresponding methods will not be described here.

[0697] For the technical effects of any of the above designs and any possible implementation methods, please refer to the above Figure 9-Figure 16 , Figure 19-21 The introduction of the technical effects of the corresponding methods will not be repeated here.

[0698] Optionally, in the communication device described in any of the above designs and any of the possible implementation modes:

[0699] In one implementation, the communication device is a communication device. When the communication device is a communication device, the communication unit may be a transceiver, or an input / output interface; the processing unit may be at least one processor. Optionally, the transceiver may be a transceiver circuit. Optionally, the input / output interface may be an input / output circuit.

[0700] In another implementation, the communication device is a chip (system) or circuit used in a communication device. When the communication device is a chip (system) or circuit used in a communication device, the communication unit may be a communication interface (input / output interface), interface circuit, output circuit, input circuit, pin or related circuit on the chip (system) or circuit; the processing unit may be at least one processor, processing circuit or logic circuit.

[0701] According to the embodiment of the present application, Fig. 22 The various units in the device shown can be separately or all combined into one or several other units to constitute, or some of the units (some) can also be split into multiple smaller units in function to constitute, which can achieve the same operation without affecting the realization of the technical effects of the embodiments of the present application. The above-mentioned units are divided based on logical functions. In practical applications, the functions of one unit can also be implemented by multiple units, or the functions of multiple units can be implemented by one unit. In other embodiments of the present application, other units can also be included based on the electronic device. In practical applications, these functions can also be implemented with the assistance of other units, and can be implemented by the collaboration of multiple units.

[0702] It should be noted that the implementation of each unit can also refer to the above Figure 9-Figure 16 , Figure 19-21 The corresponding description of the method embodiment shown.

[0703] exist Fig. 22 In the described communication device 220, the occurrence of trigger conflicts can be avoided, or when there are trigger conflicts, the target CU of DU migration can be determined, thereby ensuring smooth completion of DU migration.

[0704] In another possible design, the communication device 220 may correspond to the above Fig.12 , Fig.13 , Fig.14 , Fig.17 and Fig.18 The OAM server in the method embodiment shown in the figure, such as the communication device 220, can be an OAM server, or a chip in the OAM server. The communication device 220 can include a Fig.12 , Fig.13 , Fig.14 , Fig.17 and Fig.18 In the method embodiment shown, the units of the operation performed by the first host node, and the units in the communication device 220 are respectively for implementing the above Fig.12 , Fig.13 , Fig.14 , Fig.17 and Fig.18 The operations performed by the OAM server in the method embodiment shown are as follows:

[0705] The communication unit 2202 is configured to receive fourth information from the relay node, where the fourth information includes a result of the relay node establishing a third F1 interface with the target host node.

[0706] The processing unit 2201 is configured to process the fourth information.

[0707] or,

[0708] The processing unit 2201 is configured to generate tenth information, where the tenth information is used to instruct the relay node to perform DU migration;

[0709] The communication unit 2202 is configured to send tenth information to the relay node.

[0710] The method performed by the processing unit 2201 and the communication unit 2202 can be referred to in the above Fig.12 , Fig.13 , Fig.14 , Fig.17 and Fig.18The corresponding methods will not be described here.

[0711] For the technical effects of any of the above designs and any possible implementation methods, please refer to the above Fig.12 , Fig.13 , Fig.14 , Fig.17 and Fig.18 The introduction of the technical effects of the corresponding methods will not be repeated here.

[0712] Optionally, in the communication device described in any of the above designs and any of the possible implementation modes:

[0713] In one implementation, the communication device is a communication device. When the communication device is a communication device, the communication unit may be a transceiver, or an input / output interface; the processing unit may be at least one processor. Optionally, the transceiver may be a transceiver circuit. Optionally, the input / output interface may be an input / output circuit.

[0714] In another implementation, the communication device is a chip (system) or circuit used in a communication device. When the communication device is a chip (system) or circuit used in a communication device, the communication unit may be a communication interface (input / output interface), interface circuit, output circuit, input circuit, pin or related circuit on the chip (system) or circuit; the processing unit may be at least one processor, processing circuit or logic circuit.

[0715] According to the embodiment of the present application, Fig. 22 The various units in the device shown can be separately or all combined into one or several other units to constitute, or some of the units (some) can also be split into multiple smaller units in function to constitute, which can achieve the same operation without affecting the realization of the technical effects of the embodiments of the present application. The above-mentioned units are divided based on logical functions. In practical applications, the functions of one unit can also be implemented by multiple units, or the functions of multiple units can be implemented by one unit. In other embodiments of the present application, other units can also be included based on the electronic device. In practical applications, these functions can also be implemented with the assistance of other units, and can be implemented by the collaboration of multiple units.

[0716] It should be noted that the implementation of each unit can also refer to the above Fig.12 , Fig.13 , Fig.14 , Fig.17 and Fig.18 The corresponding description of the method embodiment shown.

[0717] exist Fig. 22In the described communication device 220, the network manager can obtain the connection relationship of the relay node in a timely manner, which is convenient for the network manager to manage the relay node and the next DU migration, thereby ensuring the smooth completion of DU migration.

[0718] In another possible design, the communication device 220 may correspond to the above Fig.21 The second host node in the method embodiment shown in the figure, such as the communication device 220, can be a second host node, or a chip in the second host node. The communication device 220 can include a device for executing the above Fig.21 The unit of the operation performed by the second host node in the method embodiment shown in the figure, and each unit in the communication device 220 is respectively for implementing the above Fig.21 The operations performed by the second host node in the method embodiment shown are described as follows:

[0719] The communication unit 2202 is used to receive fourteenth information from the first host node, where the fourteenth information is used to indicate to cancel the establishment of the F1 interface between the second host node and the relay node.

[0720] The processing unit 2201 is used to process the fourteenth information.

[0721] The method performed by the processing unit 2201 and the communication unit 2202 can be referred to in the above Fig.21 The corresponding methods will not be described here.

[0722] For the technical effects of any of the above designs and any possible implementation methods, please refer to the above Fig.21 The introduction of the technical effects of the corresponding methods will not be repeated here.

[0723] Optionally, in the communication device described in any of the above designs and any of the possible implementation modes:

[0724] In one implementation, the communication device is a communication device. When the communication device is a communication device, the communication unit may be a transceiver, or an input / output interface; the processing unit may be at least one processor. Optionally, the transceiver may be a transceiver circuit. Optionally, the input / output interface may be an input / output circuit.

[0725] In another implementation, the communication device is a chip (system) or circuit used in a communication device. When the communication device is a chip (system) or circuit used in a communication device, the communication unit may be a communication interface (input / output interface), interface circuit, output circuit, input circuit, pin or related circuit on the chip (system) or circuit; the processing unit may be at least one processor, processing circuit or logic circuit.

[0726] According to the embodiment of the present application, Fig. 22 The various units in the device shown can be separately or all combined into one or several other units to constitute, or some of the units (some) can also be split into multiple smaller units in function to constitute, which can achieve the same operation without affecting the realization of the technical effects of the embodiments of the present application. The above-mentioned units are divided based on logical functions. In practical applications, the functions of one unit can also be implemented by multiple units, or the functions of multiple units can be implemented by one unit. In other embodiments of the present application, other units can also be included based on the electronic device. In practical applications, these functions can also be implemented with the assistance of other units, and can be implemented by the collaboration of multiple units.

[0727] It should be noted that the implementation of each unit can also refer to the above Fig.21 The corresponding description of the method embodiment shown.

[0728] exist Fig. 22 In the described communication device 220, it is possible to avoid abnormal situations caused by the second host node trying to establish the F1 interface with the relay node again. In addition, it is possible to enable the second host node to use effective resources to establish the F1 interface with other relay nodes.

[0729] See also Fig.23 , Fig.23 A schematic diagram of the structure of a communication device provided in an embodiment of the present application.

[0730] It should be understood that Fig.23 The communication device 230 shown is only an example. The communication device of the embodiment of the present application may also include other components, or include Fig.23 components similar in function to the components in the Fig.23 All parts in.

[0731] The communication device 230 includes a communication interface 2301 and at least one processor 2302 .

[0732] The communication device 230 may correspond to any node or device in the relay node, the first host node, the second host node, the target host node, and the OAM server. The communication interface 2301 is used to send and receive signals, and at least one processor 2302 executes program instructions so that the communication device 230 implements the corresponding process of the method executed by the corresponding device in the above method embodiment.

[0733] In one possible design, the communication device 230 may correspond to the above Figure 9-Figure 21The relay node in the method embodiment shown in the figure, such as the communication device 230, can be a relay node, or a chip in the relay node. The communication device 230 can include a chip for performing the above Figure 9-Figure 21 In the method embodiment shown in FIG. 1 , the first host node performs the operation of the unit, and the units in the communication device 230 are respectively for implementing the above Figure 9-Figure 21 The operations performed by the first host node in the method embodiment shown are described as follows:

[0734] Processor 2302, configured to generate first information when a first trigger condition is met; the first information includes a result of the relay node establishing the first F1 interface with the target host node and an identifier of the target host node; or, the first information includes a result of the relay node establishing the first F1 interface with the target host node, an identifier of the target host node, and a triggering method for DU migration of the relay node;

[0735] The first trigger condition includes at least one of the following:

[0736] Based on second information provided by the network management, the second information is used to instruct the relay node to establish the first F1 interface with the target host node; or, the relay node receives third information from the first host node, and the third information is used to instruct the relay node to establish a second F1 interface with a second host node, and the second host node is different from the target host node.

[0737] The communication interface 2301 is used to send the first information.

[0738] or,

[0739] Processor 2302 is used to generate fourth information; the fourth information includes a result of the relay node establishing a third F1 interface with the target host node.

[0740] The communication interface 2301 is used to send the fourth information to the network management.

[0741] or,

[0742] The processor 2302 is configured to generate the fourth information when the second trigger condition is met;

[0743] The second trigger condition includes at least one of the following:

[0744] The relay node receives fifth information from the first host node, and the fifth information is used to instruct the relay node to establish the third F1 interface with the target host node; or, based on sixth information provided by the network management, the sixth information is used to instruct the relay node to establish a fourth F1 interface with the second host node, and the second host node is different from the target host node; or, the relay node receives seventh information from the target host node, and the seventh information is used to indicate that the establishment of the third F1 interface is completed.

[0745] The communication interface 2301 is used to send the fourth information to the network management.

[0746] or,

[0747] Processor 2302 is used to generate ninth information, where the ninth information is used to instruct the relay node to refuse to perform the DU migration.

[0748] The communication interface 2301 is used to send ninth information to the first host node. In addition, the communication interface 2301 is also used to receive eighth information from the first host node, where the eighth information is used to instruct the relay node to perform DU migration.

[0749] or,

[0750] The processor 2302 is configured to process the tenth information. For example, ignore the tenth information.

[0751] The communication interface 2301 is used to receive tenth information from the network management, where the tenth information is used to instruct the relay node to perform DU migration.

[0752] or,

[0753] Processor 2302 is used to generate twelve information; the twelfth information is used to indicate the triggering method of DU migration supported by the relay node; and / or, process thirteenth information from the first host node, the thirteenth information is used to indicate the triggering method of DU migration supported by the relay node; the triggering method includes CU triggering and / or network management triggering.

[0754] The communication interface 2301 is configured to send the twelfth information and / or receive the thirteenth information when a third trigger condition is met.

[0755] or,

[0756] The processor 2302 is configured to generate fourteenth information when the fourth trigger condition is met; the fourteenth information is used to indicate cancellation of establishing the F1 interface between the second host node and the relay node;

[0757] Wherein, the fourth trigger condition includes:

[0758] The fifteenth information is received from the relay node, wherein the fifteenth information includes that the relay node completes the establishment of an F1 interface with a target host node, and the target host node is different from the second host node.

[0759] The communication interface 2301 is used to send fourteenth information when the fourth trigger condition is met.

[0760] The method executed by the processor 2302 and the communication interface 2301 can be found in the above Figure 9-Figure 21 The corresponding methods will not be described here.

[0761] For the technical effects of any of the above designs and any possible implementation methods, please refer to the above Figure 9-Figure 21 The introduction of the technical effects of the corresponding methods will not be repeated here.

[0762] Optionally, in the communication device described in any of the above designs and any of the possible implementation modes:

[0763] In one implementation, the communication device is a communication device. When the communication device is a communication device, the communication interface may be a transceiver, or an input / output interface; the processor may be at least one processor. Optionally, the transceiver may be a transceiver circuit. Optionally, the input / output interface may be an input / output circuit.

[0764] In another implementation, the communication device is a chip (system) or circuit used in a communication device. When the communication device is a chip (system) or circuit used in a communication device, the communication interface may be a communication interface (input / output interface), an interface circuit, an output circuit, an input circuit, a pin or a related circuit on the chip (system) or circuit; the processor may be at least one processor, a processing circuit or a logic circuit.

[0765] According to the embodiment of the present application, Fig.23 The various units in the device shown can be separately or all combined into one or several other units to constitute, or some of the units (some) can also be split into multiple smaller units in function to constitute, which can achieve the same operation without affecting the realization of the technical effects of the embodiments of the present application. The above-mentioned units are divided based on logical functions. In practical applications, the functions of one unit can also be implemented by multiple units, or the functions of multiple units can be implemented by one unit. In other embodiments of the present application, other units can also be included based on the electronic device. In practical applications, these functions can also be implemented with the assistance of other units, and can be implemented by the collaboration of multiple units.

[0766] It should be noted that the implementation of each unit can also refer to the above Figure 9-Figure 21 The corresponding description of the method embodiment shown.

[0767] exist Fig.23 In the described communication device 230, the occurrence of trigger conflicts can be avoided, or when there are trigger conflicts, the target CU of DU migration can be determined, thereby ensuring smooth completion of DU migration.

[0768] In another possible design, the communication device 230 may correspond to the above Figure 9-Figure 21 The first host node in the method embodiment shown in the figure, such as the communication device 230, can be the first host node, or a chip in the first host node. The communication device 230 can include a device for executing the above Figure 9-Figure 16 , Figure 19-21 In the method embodiment shown in FIG. 1 , the first host node performs the operation of the unit, and the units in the communication device 230 are respectively for implementing the above Figure 9-Figure 16 , Figure 19-21 The operations performed by the first host node in the method embodiment shown are described as follows:

[0769] The communication interface 2301 is used to receive first information from the relay node; the first information includes the result of the relay node establishing the first F1 interface with the target host node and the identifier of the target host node; or, the first information includes the result of the relay node establishing the first F1 interface with the target host node, the identifier of the target host node and the triggering method of the DU migration of the relay node;

[0770] Processor 2302 is used to process the first information.

[0771] or,

[0772] The communication interface 2301 is used to receive fourth information from the relay node, where the fourth information includes a result of the relay node establishing a third F1 interface with the target host node.

[0773] Processor 2302 is used to process the fourth information.

[0774] or,

[0775] The processor 2302 is configured to generate eighth information, where the eighth information is used to instruct the relay node to perform DU migration.

[0776] The communication interface 2301 is used to send the eighth information to the relay node.

[0777] or,

[0778] Processor 2302 is used to generate thirteen information; the thirteenth information is used to indicate the triggering method of DU migration supported by the relay node; and / or, process twelfth information from the relay node, the twelfth information is used to indicate the triggering method of DU migration supported by the relay node; the triggering method includes CU triggering and / or network management triggering.

[0779] The communication interface 2301 is used to send the thirteenth information and / or receive the twelfth information.

[0780] or,

[0781] The processor 2302 is configured to generate fourteenth information when the fourth trigger condition is met; the fourteenth information is used to indicate cancellation of establishing the F1 interface between the second host node and the relay node;

[0782] Wherein, the fourth trigger condition includes:

[0783] The fifteenth information is received from the relay node, wherein the fifteenth information includes that the relay node completes the establishment of an F1 interface with a target host node, and the target host node is different from the second host node.

[0784] The communication interface 2301 is used to send fourteenth information when the fourth trigger condition is met;

[0785] The method executed by the processor 2302 and the communication interface 2301 can be found in the above Figure 9-Figure 16 , Figure 19-21 The corresponding methods will not be described here.

[0786] For the technical effects of any of the above designs and any possible implementation methods, please refer to the above Figure 9-Figure 16 , Figure 19-21 The introduction of the technical effects of the corresponding methods will not be repeated here.

[0787] Optionally, in the communication device described in any of the above designs and any of the possible implementation modes:

[0788] In one implementation, the communication device is a communication device. When the communication device is a communication device, the communication interface may be a transceiver, or an input / output interface; the processor may be at least one processor. Optionally, the transceiver may be a transceiver circuit. Optionally, the input / output interface may be an input / output circuit.

[0789] In another implementation, the communication device is a chip (system) or circuit used in a communication device. When the communication device is a chip (system) or circuit used in a communication device, the communication interface may be a communication interface (input / output interface), an interface circuit, an output circuit, an input circuit, a pin or a related circuit on the chip (system) or circuit; the processor may be at least one processor, a processing circuit or a logic circuit.

[0790] According to the embodiment of the present application, Fig.23 The various units in the device shown can be separately or all combined into one or several other units to constitute, or some of the units (some) can also be split into multiple smaller units in function to constitute, which can achieve the same operation without affecting the realization of the technical effects of the embodiments of the present application. The above-mentioned units are divided based on logical functions. In practical applications, the functions of one unit can also be implemented by multiple units, or the functions of multiple units can be implemented by one unit. In other embodiments of the present application, other units can also be included based on the electronic device. In practical applications, these functions can also be implemented with the assistance of other units, and can be implemented by the collaboration of multiple units.

[0791] It should be noted that the implementation of each unit can also refer to the above Figure 9-Figure 16 , Figure 19-21 The corresponding description of the method embodiment shown.

[0792] exist Fig.23 In the described communication device 230, the occurrence of trigger conflicts can be avoided, or when there are trigger conflicts, the target CU of DU migration can be determined, thereby ensuring smooth completion of DU migration.

[0793] In another possible design, the communication device 230 may correspond to the above Fig.12 , Fig.13 , Fig.14 , Fig.17 and Fig.18 The OAM server in the method embodiment shown in the figure, such as the communication device 230, can be an OAM server, or a chip in the OAM server. The communication device 230 can include a processor for executing the above Fig.12 , Fig.13 , Fig.14 , Fig.17 and Fig.18 In the method embodiment shown in FIG. 1 , the first host node performs the operation of the unit, and the units in the communication device 230 are respectively for implementing the above Fig.12 , Fig.13 , Fig.14 , Fig.17 and Fig.18The operations performed by the OAM server in the method embodiment shown are as follows:

[0794] The communication interface 2301 is used to receive fourth information from the relay node, where the fourth information includes a result of the relay node establishing a third F1 interface with the target host node.

[0795] Processor 2302 is used to process the fourth information.

[0796] or,

[0797] The processor 2302 is configured to generate tenth information, where the tenth information is used to instruct the relay node to perform DU migration;

[0798] The communication interface 2301 is used to send the tenth information to the relay node.

[0799] The method executed by the processor 2302 and the communication interface 2301 can be found in the above Fig.12 , Fig.13 , Fig.14 , Fig.17 and Fig.18 The corresponding methods will not be described here.

[0800] For the technical effects of any of the above designs and any possible implementation methods, please refer to the above Fig.12 , Fig.13 , Fig.14 , Fig.17 and Fig.18 The introduction of the technical effects of the corresponding methods will not be repeated here.

[0801] Optionally, in the communication device described in any of the above designs and any of the possible implementation modes:

[0802] In one implementation, the communication device is a communication device. When the communication device is a communication device, the communication interface may be a transceiver, or an input / output interface; the processor may be at least one processor. Optionally, the transceiver may be a transceiver circuit. Optionally, the input / output interface may be an input / output circuit.

[0803] In another implementation, the communication device is a chip (system) or circuit used in a communication device. When the communication device is a chip (system) or circuit used in a communication device, the communication interface may be a communication interface (input / output interface), an interface circuit, an output circuit, an input circuit, a pin or a related circuit on the chip (system) or circuit; the processor may be at least one processor, a processing circuit or a logic circuit.

[0804] According to the embodiment of the present application, Fig.23The various units in the device shown can be separately or all combined into one or several other units to constitute, or some of the units (some) can also be split into multiple smaller units in function to constitute, which can achieve the same operation without affecting the realization of the technical effects of the embodiments of the present application. The above-mentioned units are divided based on logical functions. In practical applications, the functions of one unit can also be implemented by multiple units, or the functions of multiple units can be implemented by one unit. In other embodiments of the present application, other units can also be included based on the electronic device. In practical applications, these functions can also be implemented with the assistance of other units, and can be implemented by the collaboration of multiple units.

[0805] It should be noted that the implementation of each unit can also refer to the above Fig.12 , Fig.13 , Fig.14 , Fig.17 and Fig.18 The corresponding description of the method embodiment shown.

[0806] exist Fig.23 In the described communication device 230, the network manager can obtain the connection relationship of the relay node in a timely manner, which is convenient for the network manager to manage the relay node and the next DU migration, thereby ensuring the smooth completion of DU migration.

[0807] In another possible design, the communication device 230 may correspond to the above Fig.21 The second host node in the method embodiment shown in the figure, such as the communication device 230, can be a second host node, or a chip in the second host node. The communication device 230 can include a device for executing the above Fig.21 The unit of the operation performed by the second host node in the method embodiment shown in the figure, and the units in the communication device 230 are...

Claims

1. A communication method, characterized in that: The method comprises: The relay node sends a first message to the first host node when the first trigger condition is met; the first message includes a result of the relay node establishing the first F1 interface with the target host node and an identifier of the target host node; or, the first message includes a result of the relay node establishing the first F1 interface with the target host node, an identifier of the target host node, and a triggering method for DU migration of the relay node; The first trigger condition includes at least one of the following: Based on second information provided by the network management, the second information is used to instruct the relay node to establish the first F1 interface with the target host node; or, the relay node receives third information from the first host node, and the third information is used to instruct the relay node to establish a second F1 interface with a second host node, and the second host node is different from the target host node.

2. The method according to claim 1, characterized in that The result of the first F1 interface is that the F1 interface between the relay node and the target host node is established.

3. The method according to claim 1 or 2, characterized in that: The second information is also used to trigger the release of the second F1 interface.

4. A communication method, characterized in that: The method comprises: When the first trigger condition is met, the first host node receives first information from the relay node; the first information includes a result of the relay node establishing the first F1 interface with the target host node and an identifier of the target host node; or, the first information includes a result of the relay node establishing the first F1 interface with the target host node, an identifier of the target host node, and a triggering method for DU migration of the relay node; The first trigger condition includes at least one of the following: Based on second information provided by the network management, the second information is used to instruct the relay node to establish the first F1 interface with the target host node; or, the relay node receives third information from the first host node, and the third information is used to instruct the relay node to establish a second F1 interface with a second host node, and the second host node is different from the target host node.

5. A communication method, characterized in that: The method comprises: The relay node sends fourth information to the network manager; the fourth information includes the result of the relay node establishing the third F1 interface with the target host node.

6. The method according to claim 5, characterized in that The relay node sends fourth information to the network manager, including: When the second trigger condition is met, the relay node sends the fourth information to the network manager; The second trigger condition includes at least one of the following: The relay node receives fifth information from the first host node, and the fifth information is used to instruct the relay node to establish the third F1 interface with the target host node; or, based on sixth information provided by the network management, the sixth information is used to instruct the relay node to establish a fourth F1 interface with the second host node, and the second host node is different from the target host node; or, the relay node receives seventh information from the target host node, and the seventh information is used to indicate that the establishment of the third F1 interface is completed.

7. The method according to claim 5 or 6, characterized in that: The fifth information is also used to trigger the release of the fourth F1 interface.

8. The method according to any one of claims 5 to 7, characterized in that: The fourth information also includes the identifier of the target host node and / or the triggering method of the DU migration.

9. The method according to claim 8, characterized in that The fourth information also includes the identifier of the target host node and / or the triggering method of the DU migration, including: When the second trigger condition includes the relay node receiving the fifth information from the first host node and / or the sixth information provided by the network manager, the fourth information also includes the identifier of the target host node and / or the triggering method of the DU migration.

10. A communication method, characterized in that: The method comprises: The network manager receives fourth information from the relay node, where the fourth information includes a result of the relay node establishing a third F1 interface with the target host node.

11. A communication method, characterized in that: The method comprises: The relay node receives the eighth information from the first host node, and sends the ninth information to the first host node; the eighth information is used to instruct the relay node to perform DU migration, and the ninth information is used to instruct the relay node to refuse to perform the DU migration.

12. The method according to claim 11, characterized in that The ninth information includes the reason why the relay node refuses to perform the DU migration.

13. A communication method, characterized in that: The method comprises: The first host node sends eighth information to the relay node, and receives ninth information from the relay node; the eighth information is used to instruct the relay node to perform DU migration, and the ninth information is used to instruct the relay node to refuse to perform the DU migration.

14. A communication method, characterized in that: The method comprises: The relay node receives tenth information from the network management, where the tenth information is used to instruct the relay node to perform DU migration; The DU ignores the tenth information.

15. The method according to claim 14, characterized in that The method further comprises: The relay node sends eleventh information to the network manager, where the eleventh information is used to indicate rejection of DU migration triggered by the network manager or to indicate that the network manager does not trigger DU migration of the relay node.

16. A communication method, characterized in that: The method comprises: The network management sends tenth information to the relay node, where the tenth information is used to instruct the relay node to perform DU migration; The network manager receives eleventh information from the relay node, where the eleventh information is used to indicate rejection of DU migration triggered by the network manager or to indicate that the network manager does not trigger DU migration of the relay node.

17. A communication method, characterized in that: The method comprises: The relay node sends twelfth information to the first host node; The twelfth information is used to indicate the triggering method of DU migration supported by the relay node; and / or the relay node receives the thirteenth information from the first host node, and the thirteenth information is used to indicate the triggering method of DU migration supported by the relay node; the triggering method includes CU triggering and / or network management triggering.

18. The method according to claim 17, characterized in that The relay node sends twelfth information to the first host node, including: When a third trigger condition is met, the relay node sends the twelfth information to the first host node; The third trigger condition includes at least one of the following: The relay node completes network access; or, the relay node completes DU migration.

19. A communication method, characterized in that: The method comprises: The first host node sends thirteenth information to the relay node; The thirteenth information is used to indicate the triggering method of DU migration supported by the relay node; and / or, the first host node receives the twelfth information from the relay node, and the twelfth information is used to indicate the triggering method of DU migration supported by the relay node; the triggering method includes CU triggering and / or network management triggering.

20. A communication method, characterized in that: The method comprises: When the fourth trigger condition is met, the first host node sends fourteenth information to the second host node; the fourteenth information is used to indicate cancellation of establishing the F1 interface between the second host node and the relay node; Wherein, the fourth trigger condition includes: The fifteenth information is received from the relay node, wherein the fifteenth information includes that the relay node completes the establishment of an F1 interface with a target host node, and the target host node is different from the second host node.

21. A communication method, characterized in that: The method comprises: The second host node receives fourteenth information from the first host node, where the fourteenth information is used to indicate to cancel establishing the F1 interface between the second host node and the relay node.

22. A communication device, characterized in that: Comprising means for performing the method as claimed in any one of claims 1 to 21.

23. A communication device, characterized in that: comprising a processor for executing the method as claimed in any one of claims 1 to 21.

24. A communication device, characterized in that: comprising a logic circuit and an interface, wherein the logic circuit and the interface are coupled; The interface is used for inputting and / or outputting information, and the logic circuit is used for executing the method according to any one of claims 1 to 21.

25. A computer-readable storage medium, characterized in that: The computer-readable storage medium is used to store a computer program, and when the computer program is executed, the method according to any one of claims 1 to 21 is performed.

26. A communication system, characterized in that: comprising at least one of the following: a relay node, a first host node, a second host node, and a network manager; The relay node is used to execute the method as described in any one of claims 1 to 3, 5 to 9, 11 to 12, 14 to 15, 17 to 18, the first host node is used to execute the method as described in any one of claims 4, 13, 17-20, the second host node is used to execute the method as described in claim 21, and the network manager is used to execute the method as claimed in claim 10 or 16.

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