Method and apparatus for determining migration, storage medium

Abstract

The present disclosure provides a method and device for determining migration, and a storage medium, wherein the method comprises: receiving first information sent by a second node, the first information being information associated with integrated access and backhaul distribution unit (IAB-DU) migration; and determining whether to trigger DU migration based on the first information. The present disclosure can avoid DU migration conflict, save relay device signaling resources, and improve the availability of IAB nodes, especially mobile IAB nodes, as wireless relays.

Description

Technical Field

[0001] This disclosure relates to the field of communications, and in particular to methods and apparatus for determining migration, and storage media. Background Technology

[0002] Integrated access and backhaul (IAB) enables millimeter-wave base stations to perform wireless access and backhaul, effectively reducing the need for additional fiber optic deployments when deploying dense networks, and making wireless relaying possible in Next Generation Radio Access Network (NG-RAN). Summary of the Invention

[0003] To improve the availability of IAB nodes, especially mobile IAB nodes, embodiments of this disclosure provide a method, apparatus, and storage medium for determining migration.

[0004] According to a first aspect of the present disclosure, a method for determining migration is provided, the method being executed by a first node, comprising: Receive first information sent by the second node, the first information being information associated with the migration of the Integrated Access and Backhaul Distribution Unit (IAB-DU); Based on the first information, determine whether to trigger DU migration.

[0005] According to a second aspect of the present disclosure, a method for determining migration is provided, the method being executed by a second node, comprising: Send first information to the first node. The first information is information associated with the migration of the Integrated Access and Backhaul Distribution Unit (IAB-DU). The first information is used by the first node to determine whether to trigger DU migration.

[0006] According to a third aspect of the present disclosure, a first node is provided, comprising: The transceiver module is configured to receive first information sent by the second node, the first information being information associated with the migration of the Integrated Access and Backhaul Distribution Unit (IAB-DU). The processing module is configured to determine whether to trigger DU migration based on the first information.

[0007] According to a fourth aspect of the embodiments of this disclosure, a second node is provided, comprising: The transceiver module is configured to send first information to the first node. The first information is information associated with the migration of the Integrated Access and Backhaul Distribution Unit (IAB-DU). The first information is used by the first node to determine whether to trigger the DU migration.

[0008] According to a fifth aspect of the present disclosure, a first node is provided, comprising: One or more processors; The first node is used to perform the method for determining migration as described in any of the first aspects.

[0009] According to a sixth aspect of the present disclosure, a second node is provided, comprising: One or more processors; The terminal is used to perform the method for determining migration as described in any of the second aspects.

[0010] According to a seventh aspect of the present disclosure, a communication system is provided, comprising: The first node, the terminal, is configured to execute the method for determining migration as described in any of the first aspects; The second node is used to perform the method for determining migration as described in any of the second aspects.

[0011] According to an eighth aspect of the present disclosure, a storage medium is provided that stores instructions which, when executed on a communication device, cause the communication device to perform a method for determining a migration as described in either the first or second aspect.

[0012] In this embodiment of the disclosure, the first node can determine whether to trigger the DU migration of the IAB node based on the first information sent by the second node, thereby avoiding DU migration conflicts, saving relay equipment signaling resources, improving the reliability of the IAB node in performing DU migration, and improving the availability of the IAB node, especially the mobile IAB node, as a wireless relay.

[0013] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0014] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0015] Figure 1A This is an exemplary schematic diagram of the architecture of a communication system provided according to embodiments of the present disclosure.

[0016] Figure 1B This is an exemplary schematic diagram of the NG-RAN architecture provided according to embodiments of this disclosure.

[0017] Figure 1C This is an exemplary schematic diagram of a connection scenario prior to performing MT migration according to an embodiment of this disclosure.

[0018] Figure 1D This is an exemplary schematic diagram of a connection scenario after performing MT migration according to an embodiment of this disclosure.

[0019] Figure 1E This is an exemplary schematic diagram of a connection scenario before and after performing MT migration according to an embodiment of this disclosure.

[0020] Figure 1F This is an exemplary schematic diagram of a process for triggering MT migration according to an embodiment of this disclosure.

[0021] Figure 1G This is an exemplary schematic diagram of a process for triggering an F1 connection according to an embodiment of the present disclosure.

[0022] Figure 1H This is an exemplary schematic diagram of a process for notifying the F1 connection establishment result according to an embodiment of the present disclosure.

[0023] Figure 2A This is an exemplary interactive diagram of a method for determining migration according to embodiments of the present disclosure.

[0024] Figure 2B This is an exemplary interactive diagram of a method for determining migration according to embodiments of the present disclosure.

[0025] Figure 3A This is an exemplary interactive diagram of a method for determining migration according to embodiments of the present disclosure.

[0026] Figure 3B This is an exemplary interactive diagram of a method for determining migration according to embodiments of the present disclosure.

[0027] Figure 3C This is an exemplary interactive diagram of a method for determining migration according to embodiments of the present disclosure.

[0028] Figure 3D This is an exemplary interactive diagram of a method for determining migration according to embodiments of the present disclosure.

[0029] Figure 4A This is an exemplary interactive diagram of a method for determining migration according to embodiments of the present disclosure.

[0030] Figure 4B This is an exemplary interactive diagram of a method for determining migration according to embodiments of the present disclosure.

[0031] Figure 5A This is an exemplary interactive diagram of an apparatus for determining migration according to embodiments of the present disclosure.

[0032] Figure 5B This is an exemplary interactive diagram of an apparatus for determining migration according to embodiments of the present disclosure.

[0033] Figure 6A This is an exemplary interaction diagram of a communication device provided according to an embodiment of the present disclosure.

[0034] Figure 6B This is an exemplary interactive diagram of a chip provided according to an embodiment of the present disclosure. Detailed Implementation

[0035] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the invention as detailed in the appended claims.

[0036] This disclosure provides a method, apparatus, and storage medium for determining migration.

[0037] In a first aspect, embodiments of this disclosure propose a method for determining migration, the method being executed by a first node, including: Receive first information sent by the second node, the first information being information associated with the migration of the Integrated Access and Backhaul Distribution Unit (IAB-DU); Based on the first information, determine whether to trigger DU migration.

[0038] In the above embodiments, the first node can determine whether to trigger DU migration based on the first information sent by the second node. This first information is related to the migration of the Integrated Access and Backhaul (IAB-DU). This avoids the problem of multiple nodes simultaneously triggering DU migration conflicts in the IAB node, improving the reliability of DU migration execution by the IAB node.

[0039] In conjunction with some embodiments of the first aspect, in some embodiments, receiving the first information sent by the second node includes: Receive a first message sent by the second node; wherein the first message is an F1 interface application protocol F1AP message, and the first message includes the first information.

[0040] In the above embodiment, the first node can receive a first message sent by the second node. The first message can be an F1AP message, which carries first information. This approach is simple to implement and highly usable.

[0041] In conjunction with some embodiments of the first aspect, in some embodiments, the first information includes DU migration information.

[0042] In the above embodiments, the first information may include DU migration information, so that the first node can determine whether to trigger DU migration based on the DU migration information, thereby improving the reliability of the IAB node performing DU migration.

[0043] In conjunction with some embodiments of the first aspect, in some embodiments, the DU migration information includes at least one of the following: Pre-configuration information; Migration request information, which is used to request the first node to trigger the DU migration.

[0044] In the above embodiments, the first node can determine whether to trigger DU migration based on pre-configuration information and / or migration request information, thereby improving the reliability of IAB nodes performing DU migration.

[0045] In conjunction with some embodiments of the first aspect, in some embodiments, the pre-configuration information includes at least one of the following: One or more first candidate target integrated access and backhaul host node centralized unit target IAB-donor-CU base station identification information, the first candidate target IAB-donor-CU is a pre-configured candidate target IAB-donor-CU; Identification information of IAB nodes; First migration time information, which is used to indicate the pre-configured time information for migration to the corresponding first candidate target IAB-donor-CU.

[0046] In the above embodiments, the pre-configuration information may include, but is not limited to, the information described above. The first node can determine whether to trigger DU migration based on the pre-configuration information, and determine the target IAB-donor-CU to which it is to be migrated, thereby improving the reliability of DU migration.

[0047] In conjunction with some embodiments of the first aspect, in some embodiments, the migration request information includes at least one of the following: Base station identification information of one or more second candidate target IAB-donor-CUs, wherein the second candidate target IAB-donor-CU is the candidate target IAB-donor-CU to which the second node requests to migrate; Identification information of IAB nodes; The second migration time information is used to indicate the time information for migration to the corresponding second candidate target IAB-donor-CU.

[0048] In the above embodiments, the migration request information may include, but is not limited to, the information described above. The first node can determine whether to trigger DU migration and determine the target IAB-donor-CU to which it is to be migrated based on the migration request information, thereby improving the reliability of DU migration.

[0049] In conjunction with some embodiments of the first aspect, in some embodiments, determining whether to trigger DU migration based on the first information includes: Based on the DU migration information, the DU migration is determined to be triggered; The method further includes: Based on the DU migration information and / or network load information, determine the target IAB-donor-CU to which the IAB-DU is to be migrated.

[0050] In the above embodiments, when the first node determines that the DU migration is triggered based on the DU migration information, it can determine the target IAB-donor-CU to which the IAB-DU should be migrated based on the DU migration information and / or network load information. This improves the availability of IAB nodes, especially mobile IAB nodes, as wireless relays.

[0051] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes: A second message is sent to the second node. The second message is an F1AP message, and the second message is used to trigger the IAB-DU to establish an F1 connection with the target IAB-donor-CU.

[0052] In the above embodiment, the first node can send a second message to the second node, thereby triggering the establishment of an F1 connection between the IAB-DU and the target IAB-donor-CU. This further improves the reliability of DU migration.

[0053] In conjunction with some embodiments of the first aspect, in some embodiments, determining whether to trigger DU migration based on the DU migration information includes: Based on the DU migration information, it is determined that the DU migration will not be triggered.

[0054] In the above embodiments, the first node can also determine not to trigger DU migration based on DU migration information, thereby avoiding conflicts with DU migrations triggered by other nodes and improving the reliability and availability of DU migration.

[0055] In conjunction with some embodiments of the first aspect, in some embodiments, the first node is an Integrated Access and Backhaul (IAB) donor node, and the second node is an IAB node; or, The first node is the IAB-donor-CU, which integrates access and backhaul hosts; the second node is the IAB-DU; or, The first node is the F1-terminating-IAB-donor-CU, the centralized unit for F1 termination of integrated access and backhaul host, and the second node is the IAB-DU; or, the first node is the source F1-terminating-IAB-donor-CU, and the second node is the source IAB-DU; or... The first node is the centralized unit gNB-CU of the base station, and the second node is the distributed unit gNB-DU of the base station.

[0056] In the above embodiments, the first node and the second node can correspond to the aforementioned nodes respectively, thereby improving the availability of IAB nodes, especially mobile IAB nodes, as wireless relays.

[0057] In conjunction with some embodiments of the first aspect, in some embodiments, the first information includes result indication information, which is used to indicate the F1 connection establishment result.

[0058] In the above embodiments, the first information may include result indication information, which is used to indicate the F1 connection establishment result. The first node can determine whether to trigger DU migration based on the F1 connection establishment result, thereby improving the reliability of IAB node performing DU migration and improving the availability of IAB node, especially mobile IAB node, as a wireless relay.

[0059] In conjunction with some embodiments of the first aspect, in some embodiments, the result indication information is used to indicate: The result of establishing an F1 connection between the third and fourth nodes.

[0060] In the above embodiments, the result indication information can be used to indicate the result of the third node establishing an F1 connection with the fourth node. After the third node and the fourth node establish an F1 connection, the first node can trigger DU migration, allowing the IAB-DU to migrate to a more suitable target IAB-donor-CU, thereby improving the reliability of the IAB node performing DU migration.

[0061] In some embodiments of the first aspect, the fourth node is determined by the second node based on the migration configuration information of the operation management and maintenance OAM device and / or the second message, and the result indication information is used to instruct the third node to establish an F1 connection with the fourth node, and the second message is sent by the first node to the second node; wherein, the second message is an F1AP message, and the second message is used to trigger the IAB-DU to establish an F1 connection with the target IAB-donor-CU.

[0062] In the above embodiments, the fourth node can be determined by the second node, and the second node can send the result indication information to the first node through a second message. The first node can determine, based on the second message, whether the third node and the fourth node should establish an F1 connection. This allows the first node to determine whether to trigger DU migration, resulting in high availability.

[0063] In conjunction with some embodiments of the first aspect, in some embodiments, the result indication information includes at least one of the following: The identification information of the fourth node; The trigger node indicates that the trigger node is the node that initiates the establishment of the F1 connection between the third node and the fourth node.

[0064] In the above embodiments, the result indication information may include the aforementioned information, so that the first node can identify the fourth node and the triggering node that triggers the third node to establish the F1 connection with the fourth node. This avoids DU migration conflicts and improves the reliability of DU migration.

[0065] In conjunction with some embodiments of the first aspect, in some embodiments, determining whether to trigger DU migration based on the first information includes: Based on the result indication information, it is determined to trigger the establishment of a new F1 connection.

[0066] In the above embodiments, the first node can trigger a new F1 connection based on the result indication information, if it is determined that there is a more suitable target node (a node different from the third node), so that the fourth node can perform DU migration and migrate to the more suitable target node, resulting in high availability.

[0067] In conjunction with some embodiments of the first aspect, in some embodiments, determining whether to trigger DU migration based on the first information includes: Based on the result indication information, it is determined that the establishment of a new F1 connection will not be triggered.

[0068] In the above embodiments, the first node can, based on the result indication information, avoid triggering a new F1 connection to avoid the waste of resources caused by frequent DU migration, thus achieving high availability.

[0069] In conjunction with some embodiments of the first aspect, in some embodiments, the first node and the fourth node are IAB-donor nodes, and the second node and the third node are IAB nodes; or, The first and fourth nodes are IAB-donor-CU, and the second and third nodes are IAB-DU; or, The first and fourth nodes are F1-terminating-IAB-donor-CU, and the second and third nodes are the IAB-DU; or, The first node is the source F1-terminating-IAB-donor-CU, the fourth node is the target F1-terminating-IAB-donor-CU, the second node is the source IAB-DU, and the third node is the target IAB-DU; or, The first and fourth nodes are gNB-CU, and the second and third nodes are gNB-DU.

[0070] In the above embodiments, the first node, the second node, the third node, and the fourth node can correspond to the aforementioned nodes, thereby improving the availability of IAB nodes, especially mobile IAB nodes, as wireless relays.

[0071] Secondly, embodiments of this disclosure propose a method for determining migration, the method being executed by a second node, including: Send first information to the first node. The first information is information associated with the migration of the Integrated Access and Backhaul Distribution Unit (IAB-DU). The first information is used by the first node to determine whether to trigger DU migration.

[0072] In conjunction with some embodiments of the second aspect, in some embodiments, sending the first information to the first node includes: Send a first message to the first node; wherein the first message is an F1 interface application protocol F1AP message, and the first message includes the first information.

[0073] In conjunction with some embodiments of the second aspect, in some embodiments, the first information includes DU migration information.

[0074] In conjunction with some embodiments of the second aspect, in some embodiments, the DU migration information includes at least one of the following: Pre-configuration information; Migration request information, which is used to request the first node to trigger DU migration.

[0075] In conjunction with some embodiments of the second aspect, in some embodiments, the pre-configuration information includes at least one of the following: One or more first candidate target integrated access and backhaul host node centralized unit target IAB-donor-CU base station identification information, the first candidate target IAB-donor-CU is a pre-configured candidate target IAB-donor-CU; Identification information of IAB nodes; First migration time information, which is used to indicate the pre-configured time information for migration to the corresponding first candidate target IAB-donor-CU.

[0076] In conjunction with some embodiments of the second aspect, in some embodiments, the migration request information includes at least one of the following: Base station identification information of one or more second candidate target IAB-donor-CUs, wherein the second candidate target IAB-donor-CU is the candidate target IAB-donor-CU to which the second node requests to migrate; Identification information of IAB nodes; The second migration time information is used to indicate the time information for migration to the corresponding second candidate target IAB-donor-CU.

[0077] In conjunction with some embodiments of the second aspect, in some embodiments, the method further includes: The system receives a second message sent by the first node. The second message is an F1AP message, and the second message is used to trigger the IAB-DU to establish an F1 connection with the target IAB-donor-CU.

[0078] In conjunction with some embodiments of the second aspect, in some embodiments, the first node is an integrated access and backhaul host (IAB-donor) node, and the second node is an IAB node; or, The first node is the IAB-donor-CU, which integrates access and backhaul hosts; the second node is the IAB-DU; or, The first node is the F1-terminating-IAB-donor-CU, the centralized unit for F1 termination of integrated access and backhaul host, and the second node is the IAB-DU; or, the first node is the source F1-terminating-IAB-donor-CU, and the second node is the source IAB-DU; or... The first node is the centralized unit gNB-CU of the base station, and the second node is the distributed unit gNB-DU of the base station.

[0079] In conjunction with some embodiments of the second aspect, in some embodiments, the first information includes result indication information, which is used to indicate the F1 connection establishment result.

[0080] In conjunction with some embodiments of the second aspect, in some embodiments, the result indication information is used to indicate: The result of establishing an F1 connection between the third and fourth nodes.

[0081] In conjunction with some embodiments of the second aspect, in some embodiments, the method further includes: Based on the migration configuration information of the Operation Management and Maintenance (OAM) device and / or the second message, a fourth node is determined, wherein the second message is sent by the first node to the second node; wherein the second message is an F1AP message, and the second message is used to trigger the IAB-DU to establish an F1 connection with the target IAB-donor-CU; The result indication information is used to instruct the third node to establish an F1 connection with the fourth node.

[0082] In conjunction with some embodiments of the second aspect, in some embodiments, the result indication information includes at least one of the following: The identification information of the fourth node; The trigger node indicates that the trigger node is the node that initiates the establishment of the F1 connection between the third node and the fourth node.

[0083] In conjunction with some embodiments of the second aspect, in some embodiments, the first node and the fourth node are IAB-donor nodes, and the second node and the third node are IAB nodes; or, The first and fourth nodes are IAB-donor-CU, and the second and third nodes are IAB-DU; or, The first and fourth nodes are F1-terminating-IAB-donor-CU, and the second and third nodes are the IAB-DU; or, The first node is the source F1-terminating-IAB-donor-CU, the fourth node is the target F1-terminating-IAB-donor-CU, the second node is the source IAB-DU, and the third node is the target IAB-DU; or, The first and fourth nodes are gNB-CU, and the second and third nodes are gNB-DU.

[0084] Thirdly, embodiments of this disclosure provide a first node, including: The transceiver module is configured to receive first information sent by the second node, the first information being information associated with the migration of the Integrated Access and Backhaul Distribution Unit (IAB-DU). The processing module is configured to determine whether to trigger DU migration based on the first information.

[0085] Fourthly, embodiments of this disclosure provide a second node, comprising: The transceiver module is configured to send first information to the first node. The first information is information associated with the migration of the Integrated Access and Backhaul Distribution Unit (IAB-DU). The first information is used by the first node to determine whether to trigger the DU migration.

[0086] Fifthly, embodiments of this disclosure provide a first node, comprising: One or more processors; The first node is used to perform the method for determining migration as described in any of the first aspects.

[0087] Sixthly, embodiments of this disclosure provide a second node, comprising: One or more processors; The terminal is used to execute the method for determining migration as described in any of the second nodes.

[0088] In a seventh aspect, embodiments of this disclosure provide a communication system, comprising: The first node, the terminal, is configured to execute the method for determining migration as described in any of the first aspects; The second node is used to perform the method for determining migration as described in any of the second aspects.

[0089] Eighthly, embodiments of this disclosure provide a storage medium storing instructions that, when executed on a communication device, cause the communication device to perform a method for determining a migration as described in either the first or second aspect.

[0090] Understandably, the aforementioned relay equipment, access network node, first node, second node, core network node, communication system, storage medium, program product, and computer program are all used to execute the methods proposed in the embodiments of this disclosure. Therefore, the beneficial effects that can be achieved can be referred to the beneficial effects in the corresponding methods, and will not be repeated here.

[0091] This disclosure provides a method, apparatus, and storage medium for determining migration. In some embodiments, the terms "determining migration" and "authorization method," "authorization processing method," and "communication method" can be used interchangeably; the terms "apparatus for determining migration" and "authorization method apparatus," "authorization apparatus," and "communication apparatus" can be used interchangeably; and the terms "system for determining migration" and "communication system" can be used interchangeably.

[0092] This disclosure is not exhaustive, but merely illustrative of some embodiments, and is not intended to limit the scope of protection of this disclosure. Unless otherwise specified, each step in a particular embodiment can be implemented as an independent embodiment, and the steps can be arbitrarily combined. For example, a solution after removing some steps in a particular embodiment can also be implemented as an independent embodiment, and the order of the steps in a particular embodiment can be arbitrarily interchanged. Furthermore, the optional implementation methods in a particular embodiment can be arbitrarily combined; moreover, the embodiments can be arbitrarily combined, for example, some or all steps of different embodiments can be arbitrarily combined, and a particular embodiment can be arbitrarily combined with the optional implementation methods of other embodiments.

[0093] In each of the disclosed embodiments, unless otherwise specified or in case of logical conflict, the terminology and / or descriptions of the embodiments are consistent and can be referenced by each other. Technical features in different embodiments can be combined to form new embodiments based on their inherent logical relationships.

[0094] The terminology used in the embodiments of this disclosure is for the purpose of describing particular embodiments only and is not intended to limit the scope of this disclosure.

[0095] In this disclosure, unless otherwise stated, elements expressed in the singular form, such as "a," "an," "the," "the," "the," "the," "the," "the," "this," etc., can mean "one and only one," or "one or more," "at least one," etc. For example, when using articles such as "a," "an," "the," etc. in translation, the noun following the article can be understood as either a singular or a plural expression.

[0096] In the embodiments disclosed herein, "multiple" refers to two or more.

[0097] In some embodiments, the terms “at least one of,” “one or more,” “a plurality of,” and “multiple” may be used interchangeably.

[0098] In some embodiments, the notation "at least one of A and B", "A and / or B", "A in one case, B in another", "in response to one case A, in response to another case B", etc., may include the following technical solutions depending on the situation: in some embodiments, A (executes A regardless of B); in some embodiments, B (executes B regardless of A); in some embodiments, execution is selected from A and B (A and B are selectively executed); in some embodiments, both A and B are executed. The same applies when there are more branches such as A, B, C, etc.

[0099] In some embodiments, the notation "A or B" may include the following technical solutions, depending on the situation: in some embodiments, A (execution of A regardless of B); in some embodiments, B (execution of B regardless of A); in some embodiments, selective execution from A and B (A and B are selectively executed). The same applies when there are more branches such as A, B, and C.

[0100] The prefixes "first," "second," etc., used in the embodiments of this disclosure are merely for distinguishing different descriptive objects and do not impose restrictions on the position, order, priority, quantity, or content of the descriptive objects. The description of the descriptive objects is found in the claims or the context of the embodiments, and the use of prefixes should not constitute unnecessary restrictions. For example, if the descriptive object is a "field," the ordinal numbers preceding "field" in "first field" and "second field" do not restrict the position or order of the "fields." "First" and "second" do not restrict whether the "fields" they modify are in the same message, nor do they restrict the order of "first field" and "second field." Similarly, if the descriptive object is a "level," the ordinal numbers preceding "level" in "first level" and "second level" do not restrict the priority between "levels." Furthermore, the number of descriptive objects is not limited by ordinal numbers and can be one or more. For example, in "first device," the number of "devices" can be one or more. Furthermore, the objects modified by different prefixes can be the same or different. For example, if the object being described is "device", then "first device" and "second device" can be the same device or different devices, and their types can be the same or different. Similarly, if the object being described is "information", then "first information" and "second information" can be the same information or different information, and their content can be the same or different.

[0101] In some embodiments, “including A,” “containing A,” “for indicating A,” and “carrying A” can be interpreted as directly carrying A or indirectly indicating A.

[0102] In some embodiments, the terms “in response to…”, “in response to determining…”, “in the case of…”, “when…”, “if…”, “if…”, etc., can be used interchangeably.

[0103] In some embodiments, the apparatus and device may be interpreted as physical or virtual, and their names are not limited to the names recorded in the embodiments. In some cases, they may also be understood as "equipment", "device", "circuit", "network element", "node", "function", "unit", "section", "system", "network", "chip", "chip system", "entity", "body", etc.

[0104] In some embodiments, "network" can be interpreted as devices included in the network, such as relay devices, access network nodes, core network nodes, etc.

[0105] In some embodiments, "repeater device" can also be called relay node, and "access network device (AN device)" can also be called "radioaccess network device (RAN device)," "base station (BS)," "radiobase station," "fixed station," etc. In some embodiments, it can also be understood as "node," "access point," "transmission point (TP)," "reception point (RP)," "transmission and / or reception point (TRP)," "panel," "antenna panel," "antenna array," "cell," "macro cell," "small cell," "femto cell," "pico cell," "sector," "cell group," "serving cell," "carrier," "component carrier," "bandwidth part (BWP)," etc.

[0106] In some embodiments, the “relay device” is an IAB-node, mobile IAB-node, VMR (vehicle-mounted relays), or MBSR (Mobile Base Station Relay).

[0107] In some embodiments, the "terminal portion of the relay device" is IAB-MT.

[0108] In some embodiments, the "terminal portion of the relay device" is IAB-MT in IAB AB-node or mobile IAB-MT in mobileIAB-node.

[0109] In some embodiments, the "access network portion of the relay device" is IAB-DU.

[0110] In some embodiments, the "terminal portion of the relay device" is the IAB-DU in the IAB-node or the mobile IAB-DU in the mobile IAB-node.

[0111] In this embodiment of the disclosure, IAB can be replaced by VMR or MBSR.

[0112] In some embodiments, "terminal" or "terminal device" may be referred to as "user equipment (UE)," "user terminal," "mobile station (MS)," "mobile terminal (MT)," "subscriber station," "mobile unit," "subscriber unit," "wireless unit," "remote unit," "mobile device," "wireless device," "wireless communication device," "remote device," "mobile subscriber station," "access terminal," "mobile terminal," "wireless terminal," "remote terminal," "handset," "user agent," "mobile client," "client," etc.

[0113] In some embodiments, the terms “radio”, “wireless”, “radioaccess network (RAN)”, “access network (AN)”, and “RAN-based” can be used interchangeably.

[0114] In some embodiments, the acquisition of data, information, etc., may comply with the laws and regulations of the country where the location is situated.

[0115] In some embodiments, data, information, etc., may be obtained with the user's consent.

[0116] Furthermore, each element, each row, or each column in the table of this disclosure can be implemented as an independent embodiment, and any combination of any element, any row, or any column can also be implemented as an independent embodiment.

[0117] Figure 1A This is a schematic diagram of the architecture of a communication system according to an embodiment of the present disclosure.

[0118] like Figure 1AAs shown, the communication system 100 includes a relay node 101, an access network node 102, and a core network node 103.

[0119] In some embodiments, relay node 101 may also be referred to as an IAB node (IAB-node), supporting wireless access and backhaul via New Radio (NR). The terminating node for NR backhaul on the network side is called the IAB-donor node, which is a gNB with added IAB functionality. Backhaul can be performed via single hop or multi-hop.

[0120] In some embodiments, the access network node 102 may be a node or device that connects a terminal to a wireless network. The access network node may include, but is not limited to, at least one of the following in a 5G communication system: Integrated Access Backhaul Base Station (IAB-donor), Evolved Node B (eNB), Next Generation Evolved Node B (ng-eNB), Next Generation Node B (gNB), Node B (NB), Home Node B (HNB), Home Evolved Node B (HeNB), Wireless Backhaul Device, Radio Network Controller (RNC), Base Station Controller (BSC), Base Transceiver Station (BTS), Base Band Unit (BBU), Mobile Switching Center, Base Station in 6G communication system, Open RAN, Cloud RAN, Base Station in other communication systems, and Access Node in Wi-Fi system.

[0121] In some embodiments, the technical solutions of this disclosure can be applied to the Open RAN architecture. In this case, the interfaces between or within access network nodes involved in the embodiments of this disclosure can be transformed into internal interfaces of Open RAN. The processes and information interactions between these internal interfaces can be implemented by software or programs.

[0122] In some embodiments, the access network node can be composed of a central unit (CU) and a distributed unit (DU). The CU can also be called a control unit. The CU-DU structure can separate the protocol layer of the access network node. Some of the protocol layer functions are centrally controlled by the CU, while the remaining part or all of the protocol layer functions are distributed in the DU and centrally controlled by the CU. However, this is not the only possibility.

[0123] In some embodiments, core network node 103 may be a single device comprising multiple network elements, or it may be multiple devices or a group of devices, each comprising all or part of the multiple network elements. Network elements may be virtual or physical. The core network may include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), or a Next Generation Core (NGC).

[0124] In some embodiments, the core network node 103 may include multiple network elements, such as the Access and Mobility Management Function (AMF) and the User Plane Function (UPF).

[0125] The embodiments disclosed herein can be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 5G new radio (NR), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Futuregeneration radio access (FX), Global System for Mobile communications (GSM), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), and IEEE 802.20, Ultra-Wideband (UWB), Bluetooth (a registered trademark), Public Land Mobile Network (PLMN) networks, Device-to-Device (D2D) systems, Machine-to-Machine (M2M) systems, Internet of Things (IoT) systems, Vehicle-to-Everything (V2X) systems, systems utilizing other communication methods, and next-generation systems built upon them, etc. Furthermore, multiple systems can be combined (e.g., a combination of LTE or LTE-A with 5G).

[0126] In some embodiments, the architecture of NG-RAN is as follows: Figure 1BAs shown, an access network node can be provided as an IAB-donor. An IAB-donor can include one IAB-donor-CU and one or more IAB-donor-DUs. When the control plane (gNB-CU-Control Plane, gNB-CU-CP) and user plane (gNB-CU-User Plane, gNB-CU-UP) of the gNB-CU are separated, the IAB-donor node may include one IAB-donor-CU-CP, multiple IAB-donor-CU-UPs, and multiple IAB-donor-DUs. The IAB-node can connect to the upstream IAB node (IAB-node) or IAB-donor-DU through a subset of terminal equipment functions of the 5G mobile communication radio (New Radio User Plane Interface, NR Uu) interface (referred to as the IAB-MT function in the IAB-node). The IAB-node provides radio backhaul to the downstream IAB-node and terminal equipment through the network functions of the NR Uu interface (referred to as the IAB-DU function in the IAB-node).

[0127] Control plane (F1-C) services of the F1 interface between IAB-node and IAB-donor-CU are backhauled via IAB-donor-DU and an optional intermediate hop IAB-node. F1-U services between IAB-node and IAB-donor-CU are backhauled via IAB-donor-DU and an optional intermediate hop IAB-node.

[0128] In the Release 18 (R18) IAB research project, the mobile IAB scenario is supported. The mobile IAB research focuses on scenarios where vehicle-mounted mobile IAB nodes provide 5G coverage / capability enhancement for vehicle-mounted and / or surrounding terminals.

[0129] The IAB-donor connected to the IAB-node may change as the IAB-node moves, necessitating an IAB-node migration process. Migration can be divided into partial migration, which includes, but is not limited to, migration of only IAB-MT, and full migration, which includes migrating both IAB-MT and IAB-DU to the same IAB-donor.

[0130] Partial migration can refer to only the IAB-MT on the IAB-node being migrated (also known as a switchover) to a new IAB-donor, while the IAB-DU on the IAB-node maintains its connection with the original IAB-donor (the connection needs to be established through the IAB-MT's IAB-donor-DU, that is, a corresponding transmission path needs to be established under the IAB-MT's IAB-donor), and the UE context on the IAB-DU is also stored on the original IAB-donor.

[0131] For example Figure 1C and Figure 1D As shown, Figure 1C Before performing the migration, a Uu connection is established between IAB-MT and IAB-donor-CU1, and an F1 connection is established between IAB-DU1 and IAB-donor-CU1. Figure 1D After the IAB-MT migration is performed, a Uu connection is established between IAB-MT and IAB-donor-CU2, while IAB-DU1 maintains an F1 connection with IAB-donor-CU1.

[0132] In this embodiment of the disclosure, the migration of IAB-DUs can be performed independently of IAB-MTs. That is, only the IAB-DUs on the IAB-node are migrated to a new IAB-donor. Exemplarily, the IAB-node in this disclosure can refer to the moved IAB-node.

[0133] IAB-DU can perform migration independently. When performing DU migration, all terminals served under IAB-DU need to be migrated from one IAB-donor to another. However, IAB-DU needs to disconnect its F1 connection with the source IAB-donor-CU and then establish a new F1 connection with the target IAB-donor-CU. This will cause the terminal connection to be interrupted and the terminal will need to re-establish the connection.

[0134] To avoid interruption of terminal services, for example Figure 1E As shown, a new logical DU can be created on the IAB-node, and this logical DU is connected to the target IAB-donor-CU of the IAB-DU. Figure 1E The target IAB-donor-CU is set to IAB-donor-CU2, thus enabling terminal migration. From the terminal's perspective, it involves switching from a logical cell of IAB-DU1 to a logical cell of IAB-DU2. This allows for the reuse of legacy handover procedures and reduces service interruption time.

[0135] In some embodiments, this disclosure also provides a schematic diagram of DU migration triggering, for example... Figure 1F As shown. DU migration can be triggered by the source donor-CU, for example... Figure 1F Step 1a in the above steps, or the DU migration can be triggered by an Operations, Administration and Maintenance (OAM) device connected to the IAB-MT, for example... Figure 1F Step 1b in the process. Triggering DU migration includes, but is not limited to, sending the target donor-CU's base station identifier (gNB Identification, gNB ID) and the terminal identifier corresponding to the IAB-MT to the IAB-node, so that IAB-DU2 can establish an F1 connection with the target donor-CU, for example... Figure 1F Step 2 in the process.

[0136] In this context, the Radio Resource Control (RRC) terminating donor-CU is the donor-CU of IAB-MT, and the F1 terminating donor-CU is the donor-CU of IAB-DU. After IAB-DU2 establishes an F1 connection with the target donor-CU, IAB-DU1 notifies the source donor-CU of the establishment result.

[0137] In some embodiments, the purpose of the mobile IAB F1 establishment triggering procedure is to trigger the establishment of an F1 interface between the target logical gNB-DU and the target F1-terminating donor-CU. The target logical gNB-DU is located in the same location as the gNB-DU that receives the trigger message. Based on the trigger message, the target logical gNB-DU establishes an F1 interface toward the target F1-terminating donor-CU to support mobile IAB-DU migration. This procedure uses non-terminal associated signaling.

[0138] For example Figure 1GAs shown, the gNB-CU initiates this process by sending a Mobile Integrated Access and Backhaul F1 Setup Triggering (MIABF1 SETUP TRIGGERING) message to the gNB-DU. The gNB-DU initiates Transport Network Layer (TNL) connection establishment and F1 connection establishment to the target F1-terminating donor-CU, indicated by the target gNB ID, which is included in the MIAB F1 setup TRIGGERING message.

[0139] If the MIAB F1 SETUP TRIGGERING message contains an Internet Protocol (IP) address information element (IE) for the target gNB, the gNB-DU should store that IP address and use it to establish a Stream Control Transmission Protocol (SCTP) association and to establish an F1 interface pointing to the target F1-terminating donor-CU.

[0140] If the MIAB F1 SETUP TRIGGERING message contains the IP address of the target security gateway (SecurityGatewaySeGW), then the gNB-DU should store that IP address and use it to establish a secure connection to protect the F1 interface toward the target F1-terminating donor-CU.

[0141] In some embodiments, the purpose of the mobile IAB F1 establishment result notification procedure is to report the result of the establishment of the F1 interface between the target logical gNB-DU and the target F1-terminating donor-CU. The target logical gNB-DU is located in the same location as the gNB-DU that sent the notification message and can be used to establish another F1 interface to support the migration of the mobile IAB-DU. This procedure uses non-terminal associated signaling.

[0142] For example Figure 1HAs shown, the gNB-DU initiates the process by sending a Mobile Integrated Access and Backhaul F1 Setup OUTCOME NOTIFICATION message to the gNB-CU. After the target logical gNB-DU, which is co-located with the gNB-DU, has performed the F1 setup process with the target F1-terminating donor-CU, the gNB-DU sends the MIAB F1 SETUP OUTCOME NOTIFICATION message to the gNB-CU to report the F1 setup result to the target F1-terminating donor-CU.

[0143] If the active cell mapping list is included in the MIAB F1 SETUP OUTCOME NOTIFICATION message, then if cell mapping lists are supported, the gNB-CU should take the active cell mapping list into account when further performing the switch of terminal connection from that gNB DU to a target logical gNB-DU located in the same location.

[0144] In some embodiments, both OAM and the source donor-CU can trigger DU migration. If OAM and the source donor-CU choose to migrate the IAB-DU to different target IAB-donor-CUs, a DU migration conflict will occur. To avoid DU migration conflicts, this disclosure provides a method, apparatus, and storage medium for determining migration, which effectively avoids DU migration conflicts, improves the reliability of IAB nodes performing DU migration, and enhances the availability of IAB nodes, especially mobile IAB nodes, as wireless relays.

[0145] Figure 2A This is an interactive schematic diagram illustrating a method for determining migration according to embodiments of this disclosure. Figure 2A As shown, embodiments of this disclosure relate to a method for determining migration, the method comprising: Step S2101: The second node sends the first information to the first node.

[0146] In some embodiments, the first information is information associated with the migration of the Integrated Access and Backhaul (IAB-DU) distribution unit.

[0147] In some embodiments, the first information is used by the first node to determine whether to trigger DU migration.

[0148] In some embodiments, the first node may be an IAB-donor node, and the second node may be an IAB node.

[0149] In this embodiment of the disclosure, the IAB node involved can be a mobile IAB node. Due to the mobility of mobile IAB nodes, partial migration, such as MT migration or DU migration, can be performed, or a full migration can be performed.

[0150] Of course, the IAB nodes in this disclosure are not limited to mobile IAB nodes, and schemes for performing DU migration on other types of IAB nodes should also fall within the scope of protection of this disclosure.

[0151] For example, the IAB node sends the first information to the IAB-donor node, which then determines whether to trigger DU migration based on this first information. Specifically, it can determine whether to trigger DU migration for the IAB node.

[0152] In some embodiments, the first node may be IAB-donor-CU and the second node may be IAB-DU.

[0153] For example, the IAB-DU sends the first information to the IAB-donor-CU, which then determines whether to trigger the DU migration based on the first information. Specifically, it can determine whether to trigger the IAB-DU to perform the DU migration.

[0154] In some embodiments, the first node may be the centralized unit F1-terminating-IAB-donor-CU for F1 termination of integrated access and backhaul host, and the second node may be IAB-DU.

[0155] For example, the IAB-DU sends the first information to the F1-terminating-IAB-donor-CU, which then determines whether to trigger the DU migration based on the first information. Specifically, it can determine whether to trigger the IAB-DU to perform the DU migration.

[0156] In some embodiments, performing a DU migration on an IAB-DU includes establishing an F1 connection between the target IAB-DU and the target IAB-donor-CU on the IAB-node.

[0157] In some embodiments, the first node may be the centralized unit gNB-CU of the base station, and the second node may be the distributed unit gNB-DU of the base station.

[0158] For example, gNB-DU sends the first information to gNB-CU, and gNB-CU determines whether to trigger DU migration based on the first information. Specifically, it can determine whether to trigger the gNB-DU to perform DU migration.

[0159] The above is merely an illustrative example, and other combinations of the first and second nodes should also fall within the scope of this disclosure.

[0160] In some embodiments, the second node may send a first message to the first node, which carries first information.

[0161] In one example, the first message could be an F1 Application Protocol (F1AP) message.

[0162] For example, the first message can reuse an existing F1AP message in the protocol. The second node sends the existing F1AP message to the first node, which carries the first information.

[0163] For example, the first message may be a new F1AP message provided by the protocol, which is used to send the first information.

[0164] In some embodiments, the first information may include DU migration information.

[0165] In some embodiments, the DU migration information may include pre-configuration information. This pre-configuration information may be DU migration-related information pre-configured by the OAM, which the OAM can send to the second node via the core network. The second node then sends this pre-configuration information back to the first node via a first message.

[0166] For example, the pre-configuration information may include, but is not limited to, at least one of the following: The base station identification information of one or more first candidate target integrated access and backhaul host node centralized unit (target IAB-donor-CU); Identification information of IAB nodes; First migration time information.

[0167] Among them, the base station identification information of the first candidate target IAB-donor-CU can be the gNB ID information of the first candidate target IAB-donor-CU.

[0168] The number of first candidate target IAB-donor-CUs can be one or more, and the pre-configuration information can include the base station identification information of each first candidate target IAB-donor-CU.

[0169] The first candidate target IAB-donor-CU is a pre-configured candidate target IAB-donor-CU. For example, the first candidate target IAB-donor-CU may be a candidate target IAB-donor-CU pre-configured by OAM.

[0170] The identification information of the IAB node may include, but is not limited to, the terminal identification information of the IAB-MT and / or the Backhaul Adaptation Protocol (BAP) address. This disclosure does not limit the identification information of the IAB node.

[0171] The first migration time information can be used to indicate the pre-configured time information for migration to the corresponding first candidate target IAB-donor-CU.

[0172] In this embodiment of the disclosure, the first migration time information can be used to indicate the pre-configured time point for migration to the corresponding first candidate target IAB-donor-CU, including but not limited to absolute time, such as Universal Time Coordinated (UTC), or relative time, such as the time offset value relative to the current time point.

[0173] Alternatively, the first migration time information can be used to indicate the pre-configured time period for migration to the corresponding first candidate target IAB-donor-CU.

[0174] This disclosure does not limit the content of the first migration time information.

[0175] For example, OAM can pre-configure the first migration time information to each first candidate target IAB-donor-CU and send it to the second node through the core network. After receiving it, the second node can send it back to the first node through the first message.

[0176] In some embodiments, the DU migration information may include migration request information.

[0177] In one example, the migration request information is used to request the first node to trigger the DU migration.

[0178] In one example, migration request information may include, but is not limited to, at least one of the following: Base station identification information for one or more second candidate target IAB-donor-CUs; Identification information of IAB nodes; Second migration time information.

[0179] Among them, the base station identification information of the second candidate target IAB-donor-CU can be the gNB ID information of the second candidate target IAB-donor-CU.

[0180] The number of second candidate target IAB-donor-CUs can be one or more, and the migration request information can include the base station identification information of each candidate second candidate target IAB-donor-CU.

[0181] Among them, the second candidate targetIAB-donor-CU is the candidate targetIAB-donor-CU to which the second node requests migration.

[0182] For example, when the second node requests the first node to trigger DU migration, it can determine one or more second candidate target IAB-donor-CUs in real time and send the base station identification information of each second candidate target IAB-donor-CU to the first node through a first message.

[0183] This includes the terminal identification information and / or BAP address of the IAB-MT. This disclosure does not limit the identification information of the IAB node.

[0184] The second migration time information can be used to indicate the time information of the request to migrate to the corresponding second candidate targetIAB-donor-CU.

[0185] In this embodiment of the disclosure, the second migration time information can be used to indicate the time point at which the request to migrate to the corresponding second candidate target IAB-donor-CU is made, including but not limited to absolute time, such as UTC, or relative time, such as the time offset value relative to the current time point.

[0186] Alternatively, the second migration time information can be used to indicate the pre-configured time period for migration to the corresponding second candidate target IAB-donor-CU.

[0187] This disclosure does not limit the content of the second migration time information.

[0188] In some embodiments, the DU migration information may include pre-configuration information and migration request information. The content of the pre-configuration information and migration request information has been described in the foregoing embodiments and will not be repeated here.

[0189] Step S2102: Based on the first information, the first node determines whether to trigger DU migration.

[0190] In some embodiments, the first information includes DU migration information, which includes pre-configuration information. After receiving the pre-configuration information, the first node can determine whether to trigger DU migration based on the pre-configuration information and its own decision.

[0191] Alternatively, the first node, as the final decision-making node for determining the target IAB-donor-CU, can determine the trigger for DU migration based on pre-configured information.

[0192] For example, OAM sends pre-configuration information to the second node through the core network, the second node forwards it to the first node, and the first node can determine to trigger DU migration.

[0193] In some embodiments, the first information includes DU migration information, which includes trigger request information. After receiving the trigger request information, the first node can determine that the second node has requested the first node to trigger DU migration. Based on the trigger request information, the first node can determine whether to trigger DU migration according to its own decision.

[0194] Alternatively, the first node, as the final decision-making node for determining the target IAB-donor-CU, can determine the trigger DU migration based on the trigger request information.

[0195] For example, regardless of whether the second node receives the pre-configuration information, it can send the trigger request information to the first node based on its own mobility or other conditions. The first node can then determine whether to trigger a DU migration. In some embodiments, the first node can determine, based on the DU migration information, that other nodes have triggered DU migrations. To avoid wasting signaling resources and to avoid DU migration conflicts, the first node can decide not to trigger the DU migration.

[0196] Alternatively, the first node can determine, based on DU migration information, that the timing and / or conditions for triggering DU migration are not met, and thus determine not to trigger DU migration.

[0197] For example, if the first node determines, based on pre-configuration information, that other nodes, such as OAM, are triggering DU migration, then the first node can determine not to trigger DU migration.

[0198] For example, the first node can determine whether to trigger a DU migration based on migration request information. In some embodiments, the first node can determine whether to trigger the DU migration based on pre-configuration information and migration request information.

[0199] For example, the first node can determine to trigger the DU migration based on pre-configuration information and migration request information.

[0200] For example, the first node can determine not to trigger the DU migration based on pre-configuration information and migration request information.

[0201] For example, when the first node receives pre-configuration information and migration request information, and there is a common candidate target IAB-donor-CU, it determines to trigger the DU migration.

[0202] For example, when the first node receives pre-configuration information and migration request information, and there is no common candidate target IAB-donor-CU, it determines not to trigger the DU migration.

[0203] In some embodiments, determining that a DU migration is triggered includes, but is not limited to, at least one of the following: Determine the target IAB-donor-CU based on your own strategy (e.g., network load information, etc.); Based on the candidate target IAB-donor-CU received from the second node and its own policy, the final target IAB-donor-CU is determined from the candidate target IAB-donor-CU. Instruct the IAB-DU to establish an F1 connection between the target DU and the finally determined target IAB-donor-CU.

[0204] In some embodiments, determining that a DU migration is not triggered includes, but is not limited to, at least one of the following: After determining the target IAB-donor-CU according to its own strategy, and the target IAB-donor-CU is the same as the candidate target IAB-donor-CU received from the second node, it decides not to instruct the target DU to establish an F1 connection with the determined target IAB-donor-CU. After determining the target IAB-donor-CU according to its own strategy, the target IAB-donor-CU is different from the candidate target IAB-donor-CU received from the second node, and it decides not to instruct the target DU to establish an F1 connection with the determined target IAB-donor-CU. After receiving the candidate target IAB-donor-CU from the second node, it is determined that the candidate target IAB-donor-CU received by the second node can be used as the final target IAB-donor-CU, and it is decided not to instruct the target DU to establish an F1 connection with the candidate target IAB-donor-CU.

[0205] The above is merely an illustrative example. Any scheme by which the first node determines whether to trigger DU migration based on this first information should fall within the protection scope of this disclosure.

[0206] Step S2103: The first node determines the target IAB-donor-CU to which the IAB-DU is to be migrated based on the DU migration information and / or network load information.

[0207] In some embodiments, when the first node determines that a DU migration has been triggered, it can determine the target IAB-donor-CU to which the IAB-DU should be migrated based on the DU migration information and / or network load information.

[0208] For example, after the first node determines that the DU migration has been triggered, it can determine the target IAB-donor-CU to which the IAB-DU is to be migrated based on the DU migration information and / or network load information.

[0209] The network load information may be the network load information of the first candidate target IAB-donor-CU and / or the second candidate target IAB-donor-CU, or the network load information of the third candidate target IAB-donor-CU. This disclosure does not limit the candidate target IAB-donor-CU corresponding to the network load information.

[0210] Among them, the first candidate target IAB-donor-CU is a pre-configured candidate target IAB-donor-CU, the second candidate target IAB-donor-CU is the candidate target IAB-donor-CU to which the second node requests migration, and the third candidate target IAB-donor-CU can be the candidate target IAB-donor-CU determined by the first node based on its own decision.

[0211] For example, the first node can select one from the first candidate target IAB-donor-CU as the target IAB-donor-CU based on pre-configuration information.

[0212] For example, the first node can select, based on pre-configured information, the target IAB-donor-CU from the first candidate target IAB-donor-CU whose migration time indicated by the first migration time information is closest to the current time point.

[0213] For example, the first node can select the one with the smallest network load from the third candidate target IAB-donor-CU based on the network load information of the third candidate target IAB-donor-CU.

[0214] For example, the first node can select, based on the pre-configuration information and the network load information of the first candidate target IAB-donor-CU, the one whose migration time indicated by the first migration time information is closest to the current time point and whose network load is less than the threshold as the target IAB-donor-CU.

[0215] For example, the first node selects one of the second and / or third candidate target IAB-donor-CUs as the target IAB-donor-CU based on the trigger request information.

[0216] For example, based on the trigger request information and the network load information of the second candidate target IAB-donor-CU, the first node selects the one with the smallest network load from the second candidate target IAB-donor-CU as the target IAB-donor-CU.

[0217] The above is merely an illustrative example. Any scheme in which the first node determines to trigger DU migration and then determines the target IAB-donor-CU to which the IAB-DU is to be migrated should fall within the protection scope of this disclosure.

[0218] Step S2104: The first node sends a second message to the second node.

[0219] In some embodiments, if the first node determines, based on the first information, that a DU migration has been triggered, it may send a second message to the second node.

[0220] In some embodiments, the second message may be an F1AP message, and the second message is used to trigger the IAB-DU to establish an F1 connection with the target IAB-donor-CU.

[0221] In one example, the second message could be a MIAB F1 SETUP TRIGGERING message. This second message could carry the base station identification information for the target IAB-donor-CU.

[0222] The target IAB-donor-CU is the target IAB-donor-CU determined by the first node based on pre-configuration information and / or migration request information.

[0223] For example, the target IAB-donor-CU may be one of the first candidate target IAB-donor-CUs included in the pre-configuration information, or it may be one of the second candidate target IAB-donor-CUs included in the migration request information, or it may be one of the common candidate target IAB-donor-CUs included in the pre-configuration information and the migration request information, or it may be one of the third candidate target IAB-donor-CUs determined by the first node based on its own decision. This disclosure does not limit it in this way.

[0224] In some embodiments, “get,” “obtain,” “receive,” “transmit,” “bidirectional transmission,” and “send and / or receive” can be used interchangeably and can be interpreted as receiving from other entities, obtaining from protocols, obtaining from higher layers, obtaining through self-processing, or autonomous implementation, among other meanings.

[0225] In some embodiments, terms such as “send,” “transmit,” “report,” “distribute,” “transfer,” “bidirectional transmission,” “send and / or receive” can be used interchangeably.

[0226] In some embodiments, terms such as "certain", "preset", "default", "set", "indicated", "a certain", "any", and "first" can be used interchangeably. "Certain A", "preset A", "default A", "set A", "indicated A", "a certain A", "any A", and "first A" can be interpreted as A pre-defined in a protocol or the like, or as A obtained through setting, configuration, or instruction, or as specific A, a certain A, any A, or first A, but are not limited thereto.

[0227] The communication method involved in the embodiments of this disclosure may include at least one of steps S2101 to S2104. For example, step S2101 may be implemented as an independent embodiment, step S2102 may be implemented as an independent embodiment, steps S2101 to S2102 may be implemented as independent embodiments, step S2103 may be implemented as an independent embodiment, step S2104 may be implemented as an independent embodiment, steps S2102 to S2104 may be implemented as independent embodiments, and steps S2101 to S2104 may be implemented as independent embodiments, but are not limited thereto.

[0228] In some embodiments, step S2103 is an optional step and can be omitted or replaced in different embodiments. For example, if the first node determines, based on the first information, that DU migration will not be triggered, step S2103 may not be executed.

[0229] In some embodiments, step S2104 is an optional step and can be omitted or replaced in different embodiments. For example, if the first node determines, based on the first information, that DU migration will not be triggered, step S2104 may not be executed.

[0230] In some embodiments, steps S2101 to S2104 are optional steps, and one or more of these steps may be omitted or substituted in different embodiments.

[0231] In the above embodiments, the first node can determine whether to trigger the DU migration of the IAB node based on the first information sent by the second node, thereby improving the reliability of the IAB node performing the DU migration and improving the availability of the IAB node, especially the mobile IAB node, as a wireless relay.

[0232] Figure 2B This is an interactive schematic diagram illustrating a method for determining migration according to embodiments of this disclosure. Figure 2B As shown, embodiments of this disclosure relate to a method for determining migration, the method comprising: Step S2201: The second node determines the fourth node based on the migration configuration information of the OAM device and / or the second message.

[0233] In some embodiments, the second node can serve as the final decision node for determining the target IAB-donor-CU. Accordingly, the second node can determine the fourth node. Here, the fourth node can be understood as the target node to which the migration is to be performed, as determined by the second node.

[0234] In some embodiments, migration configuration information may include pre-configuration information.

[0235] For example, OAM can send pre-configuration information to the second node through the core network, and the second node can determine whether to trigger DU migration based on the pre-configuration information, that is, to establish an F1 connection between IAB-DU and target IAB-donor-CU.

[0236] In some embodiments, migration configuration information may include other migration-related information configured by the OAM or core network nodes, where migration may be partial or full, and this disclosure does not limit this.

[0237] In some embodiments, the second message may be sent from the first node to the second node. The second message is an F1AP message, and it is used to trigger the IAB-DU to establish an F1 connection with the target IAB-donor-CU.

[0238] In some embodiments, the second node determines the fourth node based on the migration configuration information of the OAM device.

[0239] In some embodiments, the second node may determine the fourth node based on a second message sent by the first node to the second node.

[0240] In some embodiments, if the second node receives migration configuration information from OAM and a second message from the first node at the same time, then the second node, as the final decision node, can jointly determine the fourth node based on the migration configuration information and the second message.

[0241] The combinations of the second and fourth nodes will be introduced in subsequent steps and will not be discussed here.

[0242] Step S2202: The second node sends the first information to the first node.

[0243] In some embodiments, the first information may include result indication information. This result indication information is used to indicate the result of the F1 connection establishment.

[0244] In some embodiments, the second node determines the fourth node, and the determination result indication information is used to instruct the third node to establish an F1 connection with the fourth node.

[0245] In some embodiments, the second node can indicate the result of the third node establishing an F1 connection with the fourth node through result indication information. This result includes, but is not limited to, successful establishment of the F1 connection.

[0246] In some embodiments, the result indication information may include, but is not limited to, at least one of the following: The identification information of the fourth node; The trigger node indicates that the trigger node is the node that initiates the establishment of the F1 connection between the third node and the fourth node.

[0247] The triggering node can be OAM or other nodes, and other nodes can be IAB-donor nodes. This disclosure does not limit this.

[0248] In some embodiments, the second node may send a first message to the first node, which may be an F1AP message carrying first information, namely, result indication information.

[0249] In some embodiments, the first message may be a MIAB F1 SETUP OUTCOME NOTIFICATION message.

[0250] In some embodiments, the first node and the fourth node are IAB-donor nodes, and the second node and the third node are IAB nodes.

[0251] In this embodiment of the disclosure, the IAB node involved can be a mobile IAB node. Due to the mobility of mobile IAB nodes, partial migration, such as MT migration or DU migration, can be performed, or a full migration can be performed.

[0252] Of course, the IAB nodes in this disclosure are not limited to mobile IAB nodes, and schemes for performing DU migration on other types of IAB nodes should also fall within the scope of protection of this disclosure.

[0253] For example, the first node is IAB-node #1, the fourth node is IAB-donor node #2, the second node is IAB node #1, and the third node is IAB node #2.

[0254] Accordingly, the second node IAB node #1 determines the fourth node IAB-donor node #2, and the determination result indication information is used to instruct the third node IAB node #2 and the fourth node IAB-donor node #2 to establish an F1 connection. The second node IAB node #1 sends result indication information to the first node IAB-node #1 to indicate the result of the establishment of the F1 connection between the third node IAB node #2 and the fourth node IAB-donor node #2.

[0255] In some embodiments, the first node and the fourth node are F1-terminating-IAB-donor-CU, and the second node and the third node are the IAB-DU.

[0256] For example, the first node is F1-terminating-IAB-donor-CU#1, the fourth node is F1-terminating-IAB-donor-CU#2, the second node is IAB-DU#1, and the third node is IAB-DU#2.

[0257] Accordingly, the second node IAB-DU#1 determines the fourth node F1-terminating-IAB-donor-CU#2, and the determination result indication information is used to instruct the third node IAB-DU#2 and the fourth node F1-terminating-IAB-donor-CU#2 to establish an F1 connection. The second node IAB-DU#1 sends result indication information to the first node F1-terminating-IAB-donor-CU#1#1 to indicate the result of the third node IAB-DU#2 and the fourth node F1-terminating-IAB-donor-CU#2 establishing an F1 connection.

[0258] In some embodiments, the first node is the source F1-terminating-IAB-donor-CU, the fourth node is the target F1-terminating-IAB-donor-CU, the second node is the source IAB-DU, and the third node is the target IAB-DU.

[0259] For example, the source IAB-DU can determine the fourth node, namely the target F1-terminating-IAB-donor-CU. Further, it can determine result indication information to instruct the target IAB-DU and the target F1-terminating-IAB-donor-CU to establish an F1 connection. The source IAB-DU can send result indication information to the source F1-terminating-IAB-donor-CU to indicate the result of the establishment of the F1 connection between the target IAB-DU and the target F1-terminating-IAB-donor-CU.

[0260] In some embodiments, the first node and the fourth node are gNB-CU, and the second node and the third node are gNB-DU.

[0261] For example, the first node is gNB-CU#1, the fourth node is gNB-CU#2, the second node is gNB-DU#1, and the third node is gNB-DU#2.

[0262] Accordingly, the second node gNB-DU#1 determines the fourth node gNB-CU#2, and the determination result indication information is used to instruct the third node gNB-DU#2 and the fourth node gNB-CU#2 to establish an F1 connection. The second node gNB-DU#1 sends result indication information to the first node gNB-CU#1 to indicate the result of the third node gNB-DU#2 and the fourth node gNB-CU#2 establishing an F1 connection.

[0263] Step S2203: Based on the first information, the first node determines whether to trigger DU migration.

[0264] In some embodiments, if the first node determines, based on the result indication information, that the triggering node has already triggered DU migration, that the first node will no longer trigger the establishment of a new F1 connection. That is, it will not trigger DU migration again.

[0265] In some embodiments, the first node may determine to trigger the establishment of a new F1 connection if it determines, based on the result indication information, that the F1 connection between the third node and the fourth node should be interrupted.

[0266] For example, considering the mobility of the mIAB node, the first node can determine to trigger the establishment of a new F1 connection if it determines that the fourth node has changed.

[0267] For example, if the first node determines that the fourth node selected by the second node is not suitable for this DU migration, it can determine to trigger the establishment of a new F1 connection.

[0268] For example, the first node reselects the target IAB-donor-CU and instructs the target IAB-DU to establish an F1 connection with the target IAB-donor-CU. In step S2204, the first node sends a second message to the second node.

[0269] In some embodiments, if the first node determines, based on the first information, that a new F1 connection needs to be established, it may send a second message to the second node.

[0270] In some embodiments, the second message may be an F1AP message, and the second message is used to trigger the IAB-DU to establish an F1 connection with the target IAB-donor-CU.

[0271] The communication method involved in the embodiments of this disclosure may include at least one of steps S2201 to S2204. For example, step S2201 may be implemented as an independent embodiment, step S2202 may be implemented as an independent embodiment, steps S2201 to S2202 may be implemented as independent embodiments, step S2203 may be implemented as an independent embodiment, step S2204 may be implemented as an independent embodiment, steps S2202 to S2204 may be implemented as independent embodiments, and steps S2201 to S2204 may be implemented as independent embodiments, but are not limited thereto.

[0272] In some embodiments, step S2204 is an optional step and can be omitted or replaced in different embodiments. For example, if the first node determines, based on the first information, that a new F1 connection will not be triggered, step S2204 may not be executed.

[0273] In some embodiments, steps S2201 to S2204 are optional steps, and one or more of these steps may be omitted or substituted in different embodiments.

[0274] In some embodiments, steps S2201 to S2204 may be implemented in combination with or independently of steps S2101 to S2104, and this disclosure does not limit this.

[0275] In the above embodiments, the second node can send first information to the first node after determining the fourth node and establishing an F1 connection between the third node and the fourth node. The first node can then determine whether to trigger the DU migration of the IAB node based on the first information sent by the second node, thereby improving the reliability of the IAB node in performing the DU migration and enhancing the availability of the IAB node, especially the mobile IAB node, as a wireless relay.

[0276] Figure 3A This is a schematic flowchart illustrating an information processing method according to an embodiment of this disclosure. For example... Figure 3A As shown, this disclosure relates to an information method, executed by a first node, the method comprising: Step S3101: Obtain the first information.

[0277] In some embodiments, the first information is information associated with the migration of the Integrated Access and Backhaul (IAB-DU) distribution unit.

[0278] In some embodiments, the first information is used by the first node to determine whether to trigger DU migration.

[0279] In some embodiments, the first information may include DU migration information.

[0280] In some embodiments, the DU migration information may include pre-configuration information and / or migration request information.

[0281] In some embodiments, the first node may obtain the first information from the second node, but is not limited thereto; it may also receive the first information sent by other entities.

[0282] In some embodiments, the first node obtains the first information determined according to predefined rules.

[0283] In some embodiments, the first node processes the information to obtain the first information.

[0284] In some embodiments, step S3101 is omitted, the first node autonomously implements the function indicated by the first information, or the first node obtains the first information based on predefined rules or protocol agreements, or the above function is a default or default setting.

[0285] In some embodiments, optional implementations of step S3101 can be found in [reference needed]. Figure 2A Optional implementation methods of step S2101, and Figure 2A Other related parts in the embodiments involved will not be described in detail here.

[0286] Step S3102: Determine whether DU migration is triggered.

[0287] In some embodiments, the first node may determine whether to trigger DU migration based on the first information.

[0288] In some embodiments, optional implementations of step S3102 can be found in [reference needed]. Figure 2A Optional implementation methods of step S2101, and Figure 2A Other related parts in the embodiments involved will not be described in detail here.

[0289] Step S3103: Determine the target IAB-donor-CU.

[0290] In some embodiments, the first node may determine the target IAB-donor-CU based on the first information, in the event that a DU migration is triggered.

[0291] In some embodiments, optional implementations of step S3103 can be found in [reference needed]. Figure 2A Optional implementation methods of step S2103, and Figure 2A Other related parts in the embodiments involved will not be described in detail here.

[0292] Step S3104: Send the second message.

[0293] In some embodiments, the first node may send a second message based on the first information, in which case it determines that a DU migration has been triggered.

[0294] In some embodiments, the second node receives the second message.

[0295] In some embodiments, the second message may be an F1AP message, and the second message is used to trigger the IAB-DU to establish an F1 connection with the target IAB-donor-CU.

[0296] In some embodiments, optional implementations of step S3104 can be found in [reference needed]. Figure 2A Optional implementation methods of step S2104, and Figure 2A Other related parts in the embodiments involved will not be described in detail here.

[0297] The communication method involved in the embodiments of this disclosure may include at least one of steps S3101 to S3104. For example, step S3101 may be implemented as an independent embodiment, step S3102 may be implemented as an independent embodiment, steps S3101 to S3102 may be implemented as independent embodiments, step S3103 may be implemented as an independent embodiment, step S3104 may be implemented as an independent embodiment, steps S3102 to S3104 may be implemented as independent embodiments, and steps S3101 to S3104 may be implemented as independent embodiments, but are not limited thereto.

[0298] In some embodiments, step S3103 is an optional step and can be omitted or replaced in different embodiments. For example, if the first node determines, based on the first information, that DU migration will not be triggered, step S3103 may not be executed.

[0299] In some embodiments, step S3104 is an optional step and can be omitted or replaced in different embodiments. For example, if the first node determines, based on the first information, that DU migration will not be triggered, step S3104 may not be executed.

[0300] In some embodiments, steps S3101 to S3104 are optional steps, and one or more of these steps may be omitted or substituted in different embodiments.

[0301] In the above embodiments, the first node can determine whether to trigger the DU migration of the IAB node based on the first information sent by the second node, and when it is determined that the DU migration is triggered, the target IAB-donor-CU is determined, thereby improving the reliability of the IAB node performing the DU migration and improving the availability of the IAB node, especially the mobile IAB node, as a wireless relay.

[0302] Figure 3B This is a schematic flowchart illustrating an information processing method according to an embodiment of this disclosure. For example... Figure 3B As shown, this disclosure relates to an information method, executed by a first node, the method comprising: Step S3201: Obtain the first information.

[0303] In some embodiments, the first information is information associated with the migration of the Integrated Access and Backhaul (IAB-DU) distribution unit.

[0304] In some embodiments, the first information is used by the first node to determine whether to trigger DU migration.

[0305] In some embodiments, the first information may include result indication information. This result indication information is used to indicate the result of the F1 connection establishment.

[0306] In some embodiments, the first node may obtain the first information from the second node, but is not limited thereto; it may also receive the first information sent by other entities.

[0307] In some embodiments, the first node obtains the first information determined according to predefined rules.

[0308] In some embodiments, the first node processes the information to obtain the first information.

[0309] In some embodiments, step S3201 is omitted, the first node autonomously implements the function indicated by the first information, or the first node obtains the first information based on predefined rules or protocol agreements, or the above function is a default or default setting.

[0310] In some embodiments, optional implementations of step S3201 can be found in [reference needed]. Figure 2B Optional implementation methods of step S2202, and Figure 2B Other related parts in the embodiments involved will not be described in detail here.

[0311] Step S3202: Determine whether to trigger DU migration.

[0312] In some embodiments, the first node may determine whether to trigger DU migration based on the result indication information.

[0313] In some embodiments, optional implementations of step S3202 can be found in [reference needed]. Figure 2B Optional implementation methods of step S2203, and Figure 2B Other related parts in the embodiments involved will not be described in detail here.

[0314] Step S3203: Send the second message.

[0315] In some embodiments, the first node may send a second message based on the first information, in which case it determines that a DU migration has been triggered.

[0316] In some embodiments, the second node receives the second message.

[0317] In some embodiments, the second message may be an F1AP message, and the second message is used to trigger the IAB-DU to establish an F1 connection with the target IAB-donor-CU.

[0318] In some embodiments, optional implementations of step S3203 can be found in [reference needed]. Figure 2B Optional implementation methods of step S2204, and Figure 2B Other related parts in the embodiments involved will not be described in detail here.

[0319] The communication method involved in the embodiments of this disclosure may include at least one of steps S3201 to S3203. For example, step S3201 may be implemented as an independent embodiment, step S3202 may be implemented as an independent embodiment, step S3203 may be implemented as an independent embodiment, and steps S3201 to S3203 may be implemented as independent embodiments, but are not limited thereto.

[0320] In some embodiments, step S3203 is an optional step and can be omitted or replaced in different embodiments. For example, if the first node determines, based on the first information, that a new F1 connection will not be triggered, step S3203 may not be executed.

[0321] In some embodiments, steps S3201 to S3203 are optional steps, and one or more of these steps may be omitted or substituted in different embodiments.

[0322] In the above embodiments, the first node can determine whether to trigger the DU migration of the IAB node based on the result indication information sent by the second node, thereby improving the reliability of the IAB node performing the DU migration and improving the availability of the IAB node, especially the mobile IAB node, as a wireless relay.

[0323] Figure 3C This is a schematic flowchart illustrating an information processing method according to an embodiment of this disclosure. For example... Figure 3C As shown, this disclosure relates to an information method, executed by a second node, the method comprising: Step S3301: Send the first message.

[0324] In some embodiments, the second node may send first information to the first node.

[0325] In some embodiments, the first node receives first information.

[0326] In some embodiments, the first information is used by the first node to determine whether to trigger DU migration.

[0327] In some embodiments, the first information may include DU migration information.

[0328] In some embodiments, the DU migration information may include pre-configuration information and / or migration request information.

[0329] In some embodiments, optional implementations of step S3301 can be found in [reference needed]. Figure 2A Optional implementation methods of step S2101, and Figure 2A Other related parts in the embodiments involved will not be described in detail here.

[0330] Step S3302: Obtain the second message.

[0331] In some embodiments, the second node may obtain the second message from the first node, but is not limited thereto; it may also receive a second message sent by another entity.

[0332] In some embodiments, the second node obtains the second message determined according to predefined rules.

[0333] In some embodiments, the second node processes the data to obtain the second message.

[0334] In some embodiments, step S3302 is omitted, the second node autonomously implements the function indicated by the second message, or the second node obtains the second message based on predefined rules or protocol agreements, or the above function is default or default.

[0335] In some embodiments, optional implementations of step S3302 can be found in [reference needed]. Figure 2A Optional implementation methods of step S2104, and Figure 2A Other related parts in the embodiments involved will not be described in detail here.

[0336] The communication method involved in the embodiments of this disclosure may include at least one of steps S3301 to S3302. For example, step S3301 may be implemented as a standalone embodiment, step S3302 may be implemented as a standalone embodiment, and steps S3301 to S3302 may be implemented as standalone embodiments, but are not limited thereto.

[0337] In some embodiments, step S3302 is an optional step and can be omitted or replaced in different embodiments. For example, if the first node determines, based on the first information, that DU migration will not be triggered, step S3302 may not be executed.

[0338] In some embodiments, steps S3301 to S3302 are optional steps, and one or more of these steps may be omitted or substituted in different embodiments.

[0339] In the above embodiments, the second node can send first information to the first node so that the first node can determine whether to trigger the DU migration of the IAB node based on the first information. The second node can determine the target IAB-donor-CU based on the second message sent by the first node, thereby improving the reliability of the IAB node performing DU migration and improving the availability of the IAB node, especially the mobile IAB node, as a wireless relay.

[0340] Figure 3D This is a schematic flowchart illustrating an information processing method according to an embodiment of this disclosure. For example... Figure 3D As shown, this disclosure relates to an information method, executed by a second node, the method comprising: Step S3401: Determine the fourth node.

[0341] In some embodiments, the second node can serve as the final decision node for determining the target IAB-donor-CU. Accordingly, the second node can determine the fourth node. Here, the fourth node can be understood as the target node to which the migration is to be performed, as determined by the second node.

[0342] In some embodiments, optional implementations of step S3401 can be found in [reference needed]. Figure 2B Optional implementation methods of step S2201, and Figure 2B Other related parts in the embodiments involved will not be described in detail here.

[0343] Step S3402: Send the first message.

[0344] In some embodiments, the second node may send first information to the first node.

[0345] In some embodiments, the first node receives first information.

[0346] In some embodiments, the first information is used by the first node to determine whether to trigger DU migration.

[0347] In some embodiments, the first information may include result indication information.

[0348] In some embodiments, optional implementations of step S3402 can be found in [reference needed]. Figure 2B Optional implementation methods of step S2202, and Figure 2B Other related parts in the embodiments involved will not be described in detail here.

[0349] Step S3403: Obtain the second message.

[0350] In some embodiments, the second node may obtain the second message from the first node, but is not limited thereto; it may also receive a second message sent by another entity.

[0351] In some embodiments, the second node obtains the second message determined according to predefined rules.

[0352] In some embodiments, the second node processes the data to obtain the second message.

[0353] In some embodiments, step S3403 is omitted, the second node autonomously implements the function indicated by the second message, or the second node obtains the second message based on predefined rules or protocol agreements, or the above function is default or default.

[0354] In some embodiments, optional implementations of step S3403 can be found in [reference needed]. Figure 2B Optional implementation methods of step S2204, and Figure 2B Other related parts in the embodiments involved will not be described in detail here.

[0355] The communication method involved in the embodiments of this disclosure may include at least one of steps S3401 to S3403. For example, step S3401 may be implemented as an independent embodiment, step S3402 may be implemented as an independent embodiment, step S3403 may be implemented as an independent embodiment, steps S3401 to S3402 may be implemented as independent embodiments, and steps S3401 to S3403 may be implemented as independent embodiments, but are not limited thereto.

[0356] In some embodiments, step S3403 is an optional step and can be omitted or replaced in different embodiments. For example, if the first node determines, based on the first information, that DU migration will not be triggered, step S3403 may not be executed.

[0357] In some embodiments, steps S3401 to S3403 are optional steps, and one or more of these steps may be omitted or substituted in different embodiments.

[0358] In the above embodiments, the second node can determine the fourth node and send first information to the first node. The first information is result indication information. The first node determines whether to trigger DU migration based on the first information, thereby improving the reliability of IAB nodes performing DU migration and improving the availability of IAB nodes, especially mobile IAB nodes, as wireless relays.

[0359] The above method is further illustrated with examples below: In this embodiment of the disclosure, any of the following methods can be used to avoid DU migration conflicts: Method 1: OAM sends the pre-configured target donor-CU information, i.e., the pre-configuration information, to IAB-MT in advance. Then, IAB-DU1 notifies the source donor-CU of the pre-configured target donor-CU, avoiding the source donor-CU from sending an additional DU migration trigger to IAB-DU.

[0360] Method 2: The source donor-CU executes the final decision. If there is a target donor-CU selected by OAM, it needs to be decided by the source donor-CU. That is, IAB-DU1 sends the target donor-CU information received from OAM (including migration request information or pre-configuration information) to the source donor-CU. The source donor-CU determines whether to trigger DU migration based on the request information, or selects a target donor-CU to trigger DU migration based on the pre-configuration information.

[0361] Method 3: The IAB-node executes a final decision. If the IAB-node receives target donor-CU information from either OAM or sourcedonor-CU, it determines the final target donor-CU based on the implementation. Optionally, the IAB-DU1 indicates the selection result in the outcome information.

[0362] In this embodiment of the disclosure, a method for determining migration is provided, including: Option 1 corresponds to methods 1 and 2 above: First, the first node receives DU migration information from the second node through a first message, and the first node determines whether to trigger DU migration based on the DU migration information.

[0363] Secondly, the DU migration information includes at least one of the following: - Pre-configuration information; - Migration request information.

[0364] Furthermore, the pre-configuration information includes at least one of the following: One or more first-candidate target donor-CU's gNB ID; Pre-configured first migration time information; Identification information of IAB nodes.

[0365] Furthermore, the migration request information includes at least one of the following: One or more second candidate target donor-CU gNB IDs; Second migration time information for the migration execution; Identification information of IAB nodes.

[0366] Based on the above, the first node determines whether to trigger DU migration according to the DU migration information, including: Based on the DU migration information, the first node determines the target donor-CU and triggers the DU migration, i.e., sends a second message to the second node; or Based on the DU migration information, it is determined that DU migration will not be triggered, that is, the second message will not be sent to the second node.

[0367] The second message is used to trigger the establishment of an F1 connection between the target IAB-DU (i.e., IAB-DU2) and the target IAB-donor-CU.

[0368] Based on the above, the possible combinations of the first node and the second node are: The first node is IAB-donor, and the second node is IAB-node; The first node is IAB-donor-CU, and the second node is IAB-DU; The first node is F1-terminating-IAB-donor-CU, and the second node is IAB-DU; The first node is source F1-terminating-IAB-donor-CU, and the second node is source IAB-DU; The first node is gNB-CU, and the second node is gNB-DU.

[0369] Option 2 corresponds to method 3 above: First, the first node receives the result indication information from the second node through the first message, and the first node determines whether to trigger DU migration based on the result indication information.

[0370] Secondly, the result indication information is sent after the third node establishes an F1 connection with the third and fourth nodes.

[0371] Furthermore, the result indication information includes at least one of the following: The identification information of the fourth node is used to indicate the fourth node, for example, the gNB ID of the Target donor-CU; The trigger node's identification information; the trigger node is the node that initiates the connection between the third and fourth nodes. For example, OAM or IAB-donor.

[0372] Based on the above, the first node determines whether to trigger DU migration according to the result indication information, including: Based on the result indication information, the first node determines not to trigger DU migration, that is, not to send the second message to the second node. The second message is used to trigger the establishment of an F1 connection between the target IAB-DU (i.e., IAB-DU2) and the target IAB-donor-CU; or Based on the result indication information, the first node determines to trigger DU migration, that is, sends a second message to the second node.

[0373] Based on the above, the possible combinations of the first node, the second node, the third node, and the fourth node are: The first and fourth nodes are IAB-donors, and the second and third nodes are IAB-nodes; The first and fourth nodes are IAB-donor-CU, and the second and third nodes are IAB-DU; The first and fourth nodes are F1-terminating-IAB-donor-CU, and the second and third nodes are IAB-DU; The first node is source F1-terminating-IAB-donor-CU, the fourth node is target F1-terminating-IAB-donor-CU, the second node is source IAB-DU, and the third node is target IAB-DU. The first and fourth nodes are gNB-CU, and the second and third nodes are gNB-DU.

[0374] Example 1 (corresponding to Method 1 and Method 2), see Figure 4A As shown, the following steps omit content unrelated to the invention: In step S4100, the IAB-MT receives pre-configuration information from the OAM.

[0375] In step S4101, gNB-DU (i.e., IAB-DU1) sends the first message to gNB-CU (i.e., F1-terminating IAB-donor-CU).

[0376] Among them, gNB-DU can correspond to the second node mentioned above, and gNB-CU can correspond to the first node mentioned above.

[0377] The first message is an F1AP message.

[0378] The first message includes DU migration information.

[0379] The DU migration information includes at least one of the following: (Corresponding to Method 1) Pre-configuration information, including base station identification information of one or more pre-configured first candidate target donor-CUs, and / or, first migration time information, and / or, identification information of IAB nodes; (Corresponding to Method 2) Migration request information, including base station identification information of one or more second candidate targetdonor-CUs requesting migration, and / or, second migration time information, and / or, identification information of IAB nodes.

[0380] Based on the DU migration information, gNB-CU performs at least one of the following operations: (Corresponding to Method 1) Do not send Mobile IAB F1 Setup Triggering messages to gNB-DU to avoid DU migration triggered by OAM occurring simultaneously.

[0381] (Corresponding to Method 2) Send a second message to the gNB-DU (the second message is an F1AP message, for example, a MobileIAB F1 Setup Triggering message), and the target gNB ID included in the message is the target donor-CU indicated in the DU migration configuration information (i.e., Figure 4A Step S4102).

[0382] In the above embodiments, conflicts between DU migration triggered by source donor-CU and DU migration triggered by OAM can be avoided. The most suitable target donor-CU can be determined based on OAM configuration and network load, thereby ensuring the service experience of users accessing through IAB-node.

[0383] Example 2 (Method 3), refer to Figure 4B As shown, the following steps omit content unrelated to the invention: Step S4201: gNB-DU sends the first message to gNB-CU.

[0384] Among them, gNB-DU can correspond to the second node mentioned above, and gNB-CU can correspond to the first node mentioned above.

[0385] The first message is an F1AP message, such as the MIAB F1 SETUP OUTCOME NOTIFICATION message.

[0386] The first message includes result indication information, which includes at least one of the following: The identification information of the fourth node, such as the gNB ID of the Target donor-CU; The identification information of the triggering node, for example, the triggering node is OAM.

[0387] gNB-CU (source F1-terminating donor-CU) can determine whether to trigger DU migration based on the results indicated.

[0388] For example, if it is determined that OAM has already triggered DU migration, gNB-CU will not trigger DU migration.

[0389] In the above embodiments, the final target IAB-donor-CU is determined by the IAB-node, which can avoid triggering conflicts and unnecessary signaling overhead.

[0390] In some embodiments, the above method may include the method described in the embodiments of the communication system, the first node side, the second node side, etc., which will not be repeated here.

[0391] In the embodiments disclosed herein, some or all of the steps and their optional implementations may be arbitrarily combined with some or all of the steps in other embodiments, or may be arbitrarily combined with the optional implementations in other embodiments.

[0392] This disclosure also proposes an apparatus for implementing any of the above methods. For example, an apparatus is proposed that includes units or modules for implementing the steps performed by the relay device in any of the above methods. Furthermore, another apparatus is proposed that includes units or modules for implementing the steps performed by the first node and the second node (e.g., access network node, relay device, etc.) in any of the above methods.

[0393] It should be understood that the division of units or modules in the above device is only a logical functional division. In actual implementation, they can be fully or partially integrated into a single physical entity, or they can be physically separated. Furthermore, the units or modules in the device can be implemented by a processor calling software: for example, the device includes a processor connected to a memory containing instructions. The processor calls the instructions stored in the memory to implement any of the above methods or to implement the functions of the units or modules in the above device. The processor can be, for example, a general-purpose processor, such as a Central Processing Unit (CPU) or a microprocessor, and the memory can be internal or external to the device. Alternatively, the units or modules in the device can be implemented in the form of hardware circuits. The functionality of some or all of the units or modules can be achieved through the design of these hardware circuits, which can be understood as one or more processors. For example, in one implementation, the hardware circuit is an application-specific integrated circuit (ASIC), and the functionality of some or all of the units or modules is achieved through the design of the logical relationships between the components within the circuit. In another implementation, the hardware circuit can be implemented using a programmable logic device (PLD), such as a field-programmable gate array (FPGA), which can include a large number of logic gates. The connection relationships between the logic gates are configured through configuration files, thereby achieving the functionality of some or all of the units or modules. All units or modules of the above device can be implemented entirely through processor-called software, entirely through hardware circuits, or partially through processor-called software with the remaining parts implemented through hardware circuits.

[0394] In this embodiment, the processor is a circuit with signal processing capabilities. In one implementation, the processor can be a circuit with instruction read and execute capabilities, such as a Central Processing Unit (CPU), a microprocessor, a graphics processing unit (GPU) (which can be understood as a microprocessor), or a digital signal processor (DSP). In another implementation, the processor can implement certain functions through the logical relationships of hardware circuits. The logical relationships of the aforementioned hardware circuits are fixed or reconfigurable. For example, the processor is a hardware circuit implemented using an application-specific integrated circuit (ASIC) or a programmable logic device (PLD), such as an FPGA. In a reconfigurable hardware circuit, the process of the processor loading a configuration document and configuring the hardware circuit can be understood as the process of the processor loading instructions to implement the functions of some or all of the above units or modules. Furthermore, it can also be a hardware circuit designed for artificial intelligence, which can be understood as an ASIC, such as a Neural Network Processing Unit (NPU), a Tensor Processing Unit (TPU), or a Deep Learning Processing Unit (DPU).

[0395] Figure 5A This is a schematic diagram of the structure of the first node proposed in an embodiment of this disclosure. For example... Figure 5A As shown, the first node 5100 may include: a transceiver module 5101 and a processing module 5102.

[0396] In some embodiments, the transceiver module 5101 is configured to receive first information sent by the second node, the first information being information associated with the migration of the Integrated Access and Backhaul Distribution Unit (IAB-DU).

[0397] Optionally, the transceiver module 5101 is used to perform at least one of the communication steps such as sending and / or receiving performed by the first node 5100 in any of the above methods (e.g., steps S2101, S2104, S2202, and S2204, but not limited thereto), which will not be elaborated here.

[0398] In some embodiments, the processing module 5102 is configured to determine whether to trigger DU migration based on the first information.

[0399] Optionally, the processing module 5102 is configured to execute at least one of the other steps (such as step S2102, step S2103, step S2203, but not limited thereto) executed by the first node 5100 in any of the above methods, which will not be elaborated here.

[0400] Figure 5B This is a schematic diagram of the structure of the second node proposed in an embodiment of this disclosure. Figure 5B As shown, the second node 5200 may include a transceiver module 5201.

[0401] In some embodiments, the transceiver module 5201 is configured to send first information to a first node, the first information being information associated with the migration of the Integrated Access and Backhaul Distribution Unit (IAB-DU), and the first information being used by the first node to determine whether to trigger DU migration.

[0402] Optionally, the transceiver module 5201 is used to perform at least one of the communication steps such as sending and / or receiving performed by the second node 5200 in any of the above methods (e.g., steps S2101, S2104, S2202, and S2204, but not limited thereto), which will not be elaborated here.

[0403] In some embodiments, the second node further includes a processing module 5202. Figure 5B (Not shown in the image).

[0404] Optionally, the processing module 5102 is configured to perform at least one of the other steps (such as step S2201, but not limited thereto) executed by the second node 5200 in any of the above methods, which will not be described in detail here.

[0405] In some embodiments, the transceiver module may include a transmitting module and / or a receiving module, which may be separate or integrated. Optionally, the transceiver module may be interchangeable with a transceiver.

[0406] In some embodiments, the processing module may be a single module or may include multiple sub-modules. Optionally, the multiple sub-modules may each perform all or part of the steps required by the processing module. Optionally, the processing module may be interchangeable with a processor.

[0407] Figure 6AThis is a schematic diagram of the structure of the communication device 6100 proposed in this embodiment. The communication device 6100 can be a network device (e.g., a core network node, access network node, etc.), a terminal (e.g., a user equipment, etc.), a chip, chip system, or processor that supports the core network node in implementing any of the above methods, or a chip, chip system, or processor that supports the terminal in implementing any of the above methods. The communication device 6100 can be used to implement the methods described in the above method embodiments; for details, please refer to the descriptions in the above method embodiments.

[0408] like Figure 6A As shown, the communication device 6100 includes one or more processors 6101. The processor 6101 can be a general-purpose processor or a dedicated processor, such as a baseband processor or a central processing unit (CPU). The baseband processor can be used to process communication protocols and communication data, while the CPU can be used to control communication devices (such as base stations, baseband chips, terminal devices, terminal device chips, DUs or CUs, relay devices, relay device DUs or CUs, etc.), execute programs, and process program data. The communication device 6100 is used to execute any of the above methods.

[0409] In some embodiments, the communication device 6100 further includes one or more memories 6102 for storing instructions. Optionally, all or part of the memories 6102 may also be located outside the communication device 6100.

[0410] In some embodiments, the communication device 6100 further includes one or more transceivers 6103. When the communication device 6100 includes one or more transceivers 6103, the transceivers 6103 perform at least one of the communication steps such as sending and / or receiving in the above method (e.g., steps S2101, S2104, S2202, and S2204, but not limited thereto), and the processor 6101 performs at least one of other steps (e.g., steps S2102, S2103, S2201, and S2203, but not limited thereto).

[0411] In some embodiments, a transceiver may include a receiver and / or a transmitter, which may be separate or integrated. Optionally, the terms transceiver, transceiver unit, transceiver, transceiver circuit, etc., may be used interchangeably; the terms transmitter, transmitting unit, transmitter, transmitting circuit, etc., may be used interchangeably; and the terms receiver, receiving unit, receiver, receiving circuit, etc., may be used interchangeably.

[0412] In some embodiments, the communication device 6100 may include one or more interface circuits 6104. Optionally, the interface circuit 6104 is connected to the memory 6102, and the interface circuit 6104 can be used to receive signals from the memory 6102 or other devices, and can be used to send signals to the memory 6102 or other devices. For example, the interface circuit 6104 can read instructions stored in the memory 6102 and send the instructions to the processor 6101.

[0413] The communication device 6100 described in the above embodiments may be a network device or a terminal, but the scope of the communication device 6100 described in this disclosure is not limited thereto, and the structure of the communication device 6100 may vary. Figure 6A The limitations. The communication device can be a standalone device or part of a larger device. For example, the communication device can be: (1) a standalone integrated circuit IC, or chip, or chip system or subsystem; (2) a collection of one or more ICs, optionally including storage components for storing data and programs; (3) an ASIC, such as a modem; (4) a module that can be embedded in other devices; (5) a receiver, terminal device, smart terminal device, cellular phone, wireless device, handheld device, mobile unit, vehicle device, network device, cloud device, artificial intelligence device, etc.; (6) others, etc.

[0414] Figure 6B This is a schematic diagram of the structure of chip 6200 according to an embodiment of this disclosure. For cases where chip 6200 can be a chip or a chip system, please refer to... Figure 6B The diagram shown is a schematic representation of the structure of chip 6200, but it is not limited to this.

[0415] Chip 6200 includes one or more processors 6201, which are used to perform any of the above methods.

[0416] In some embodiments, chip 6200 further includes one or more interface circuits 6202. Optionally, the interface circuit 6202 is connected to memory 6203, and the interface circuit 6202 can be used to receive signals from memory 6203 or other devices, and the interface circuit 6202 can be used to send signals to memory 6203 or other devices. For example, the interface circuit 6202 can read instructions stored in memory 6203 and send the instructions to processor 6201.

[0417] In some embodiments, the interface circuit 6202 performs at least one of the communication steps such as sending and / or receiving in the above method (e.g., steps S2101, S2104, S2202, and S2204, but not limited thereto), and the processor 6201 performs at least one of the other steps (e.g., steps S2102, S2103, S2201, and S2203, but not limited thereto).

[0418] In some embodiments, the terms interface circuit, interface, transceiver pin, transceiver, etc., can be used interchangeably.

[0419] In some embodiments, chip 6200 further includes one or more memories 6203 for storing instructions. Optionally, all or part of the memories 6203 may be located outside of chip 6200.

[0420] This disclosure also proposes a storage medium storing instructions that, when executed on the communication device 6100, cause the communication device 6100 to perform any of the above methods. Optionally, the storage medium is an electronic storage medium. Optionally, the storage medium is a computer-readable storage medium, but not limited thereto; it may also be a storage medium readable by other devices. Optionally, the storage medium may be a non-transitory storage medium, but not limited thereto; it may also be a temporary storage medium.

[0421] This disclosure also provides a program product that, when executed by the communication device 6100, causes the communication device 6100 to perform any of the above methods. Optionally, the program product is a computer program product.

[0422] This disclosure also proposes a computer program that, when run on a computer, causes the computer to perform any of the above methods.

[0423] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

[0424] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A method for determining migration, characterized in that, The method is executed by the first node and includes: The system receives first information sent by a second node, which is information related to the migration of the Integrated Access and Backhaul (IAB-DU) distributed unit. Wherein, if the first information includes result indication information, the result indication information is used to indicate the F1 connection establishment result, which is the result of an F1 connection being established between a third node and a fourth node. The fourth node is a node determined by the second node based on the migration configuration information of the Operation Management and Maintenance (OAM) equipment, and the result indication information is used to instruct the third node to establish an F1 connection with the fourth node. Wherein, the first node is the source F1-terminating-IAB-donor-CU, the fourth node is the target F1-terminating-IAB-donor-CU, the second node is the source IAB-DU, and the third node is the target IAB-DU. Based on the first information, it is determined that the IAB-DU migration is triggered by OAM.

2. The method according to claim 1, characterized in that, The first information received from the second node includes: Receive a first message sent by the second node; wherein the first message is an F1 interface application protocol F1AP message, and the first message includes the first information.

3. The method according to claim 1, characterized in that, The first information includes IAB-DU migration information.

4. The method according to claim 3, characterized in that, The IAB-DU migration information includes at least one of the following: Pre-configuration information; Migration request information, which is used to request the first node to trigger the IAB-DU migration.

5. The method according to claim 4, characterized in that, The pre-configuration information includes at least one of the following: One or more first candidate target integrated access and backhaul host node centralized unit target IAB-donor-CU base station identification information, the first candidate target IAB-donor-CU is a pre-configured candidate target IAB-donor-CU; Identification information of IAB nodes; First migration time information, which is used to indicate the pre-configured time information for migration to the corresponding first candidate target IAB-donor-CU.

6. The method according to claim 4, characterized in that, The migration request information includes at least one of the following: Base station identification information of one or more second candidate target IAB-donor-CUs, wherein the second candidate target IAB-donor-CU is the candidate target IAB-donor-CU to which the second node requests to migrate; Identification information of IAB nodes; The second migration time information is used to indicate the time information for migration to the corresponding second candidate target IAB-donor-CU.

7. The method according to any one of claims 3-6, characterized in that, The first node is the Integrated Access and Backhaul Host (IAB) donor node, and the second node is an IAB node; or, The first node is the IAB-donor-CU, which integrates access and backhaul hosts; the second node is the IAB-DU; or, The first node is the F1-terminating-IAB-donor-CU, the centralized unit for F1 terminating integrated access and backhaul host; the second node is the IAB-DU; or, The first node is the source F1-terminating-IAB-donor-CU, and the second node is the source IAB-DU; or, The first node is the centralized unit gNB-CU of the base station, and the second node is the distributed unit gNB-DU of the base station.

8. The method according to claim 1 or 2, characterized in that, The result indication information includes at least one of the following: The identification information of the fourth node; The trigger node indicates that the trigger node is the node that initiates the establishment of the F1 connection between the third node and the fourth node.

9. A method for determining migration, characterized in that, The method is executed by the second node and includes: Send first information to the first node. The first information is information associated with the migration of the Integrated Access and Backhaul Distribution Unit (IAB-DU). The first information is used by the first node to determine whether to trigger the IAB-DU migration. Wherein, if the first information includes result indication information, the result indication information is used to indicate the F1 connection establishment result, and the F1 connection establishment result is the result of the third node and the fourth node establishing an F1 connection; the result indication information is used by the first node to determine that the IAB-DU migration is triggered by Operation Management and Maintenance (OAM); wherein, the first node is the source F1-terminating-IAB-donor-CU, the fourth node is the target F1-terminating-IAB-donor-CU, the second node is the source IAB-DU, and the third node is the target IAB-DU; The method further includes: Based on the migration configuration information of the OAM device, the fourth node is determined.

10. The method according to claim 9, characterized in that, Sending the first information to the first node includes: Send a first message to the first node; wherein the first message is an F1 interface application protocol F1AP message, and the first message includes the first information.

11. The method according to claim 9, characterized in that, The first information includes IAB-DU migration information.

12. The method according to claim 11, characterized in that, The IAB-DU migration information includes at least one of the following: Pre-configuration information; Migration request information, which is used to request the first node to trigger IAB-DU migration.

13. The method according to claim 12, characterized in that, The pre-configuration information includes at least one of the following: One or more first candidate target integrated access and backhaul host node centralized unit target IAB-donor-CU base station identification information, the first candidate target IAB-donor-CU is a pre-configured candidate target IAB-donor-CU; Identification information of IAB nodes; First migration time information, which is used to indicate the pre-configured time information for migration to the corresponding first candidate target IAB-donor-CU.

14. The method according to claim 12, characterized in that, The migration request information includes at least one of the following: Base station identification information of one or more second candidate target IAB-donor-CUs, wherein the second candidate target IAB-donor-CU is the candidate target IAB-donor-CU to which the second node requests to migrate; Identification information of IAB nodes; The second migration time information is used to indicate the time information for migration to the corresponding second candidate target IAB-donor-CU.

15. The method according to any one of claims 11-14, characterized in that, The first node is the Integrated Access and Backhaul Host (IAB) donor node, and the second node is an IAB node; or, The first node is the IAB-donor-CU, which integrates access and backhaul hosts; the second node is the IAB-DU; or, The first node is the F1-terminating-IAB-donor-CU, the centralized unit for F1 termination of integrated access and backhaul host, and the second node is the IAB-DU; or, the first node is the source F1-terminating-IAB-donor-CU, and the second node is the source IAB-DU; or... The first node is the centralized unit gNB-CU of the base station, and the second node is the distributed unit gNB-DU of the base station.

16. The method according to claim 9 or 10, characterized in that, The result indication information includes at least one of the following: The identification information of the fourth node; The trigger node indicates that the trigger node is the node that initiates the establishment of the F1 connection between the third node and the fourth node.

17. A first node, characterized in that, include: The transceiver module is configured to receive first information sent by the second node. This first information is related to the migration of the Integrated Access and Backhaul (IAB-DU) distributed unit. Wherein, if the first information includes result indication information, the result indication information indicates the F1 connection establishment result. This F1 connection establishment result is the result of an F1 connection being established between a third node and a fourth node. The fourth node is a node determined by the second node based on the migration configuration information of the Operation Management and Maintenance (OAM) equipment. The result indication information also indicates that the third node and the fourth node are establishing an F1 connection. The first node is the source F1-terminating-IAB-donor-CU, the fourth node is the target F1-terminating-IAB-donor-CU, the second node is the source IAB-DU, and the third node is the target IAB-DU. The processing module is configured to determine, based on the first information, that the IAB-DU migration is triggered by OAM.

18. A second node, characterized in that, include: The transceiver module is configured to send first information to the first node. The first information is information associated with the migration of the Integrated Access and Backhaul Distribution Unit (IAB-DU). The first information is used by the first node to determine whether to trigger the IAB-DU migration. Wherein, if the first information includes result indication information, the result indication information is used to indicate the F1 connection establishment result, wherein the F1 connection establishment result is the result of the third node and the fourth node establishing an F1 connection; the result indication information is used by the first node to determine that the IAB-DU migration is triggered by Operation Management and Maintenance (OAM); wherein, the first node is the source F1-terminating-IAB-donor-CU, the fourth node is the target F1-terminating-IAB-donor-CU, the second node is the source IAB-DU, and the third node is the target IAB-DU; the second node is further configured as follows: Based on the migration configuration information of the Operation Management and Maintenance (OAM) equipment, the fourth node is determined.

19. A first node, characterized in that, include: One or more processors; The first node is used to perform the method for determining migration as described in any one of claims 1-8.

20. A second node, characterized in that, include: One or more processors; The second node is used to perform the method for determining migration as described in any one of claims 9-16.

21. A communication system, characterized in that, include: A first node, wherein the first node is configured to perform the method for determining migration as described in any one of claims 1-8; The second node is used to perform the method for determining migration as described in any one of claims 9-16.

22. A storage medium storing instructions, characterized in that, When the instructions are executed on a communication device, the communication device performs the method for determining migration as described in any one of claims 1-8 or 9-16.

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