IAB node migration method and device

Abstract

An IAB node migration method and apparatus are provided, the method being applicable to a terminal device, and the method being applicable to a first IAB node, and comprising the steps of: receiving an RRC reconfiguration complete message from a terminal device and / or a child IAB node served by the first IAB node; and transmitting a first uplink message including the RRC reconfiguration complete message to a target IAB donor node via a target route, or transmitting the RRC reconfiguration complete message to a target IAB donor node by a source IAB donor node.

Description

[Technical field]

[0001] The present invention relates to the technical field of communications. [Background technology]

[0002] Integrated access and backhaul (IAB) can ensure radio relay in NG-RAN. A relay node, i.e., an IAB-node, can support NR access and backhauling. Backhauling can include single-hop or multi-hop. The end point of NR backhaul on the network side, i.e., an IAB-donor, refers to a gNB that supports additional IAB functions. An IAB donor is also called an IAB donor node.

[0003] The IAB node supports the functionality of a gNB-DU (Distributed Unit), i.e., the IAB-DU. The IAB-DU terminates the NR access interface to the terminal device and the next-hop IAB node, and also terminates the F1 protocol of the gNB-CU functionality on the IAB donor. The IAB node also supports a subset of terminal device functionality (UE functionality), i.e., the IAB-MT, which includes, for example, the physical layer, layer 2 (L2), Radio Resource Control (RRC), and Non-Access-Stratum (NAS) functionality connected to the gNB-DU connected to another IAB node or IAB donor, the gNB-CU (Centralized Unit) connected to the IAB donor, and the core network.

[0004] An IAB node is connected to one IAB donor by single-hop or multi-hop. In the topology, the IAB donor is the root node, the adjacent node on the IAB-DU interface of the IAB node is called the descendant node of the IAB node, i.e., the descendant IAB-node, and the adjacent node on the IAB-MT interface is called the parent node, i.e., the parent IAB-node.

[0005] It should be noted that the introduction of the above background art is intended to clearly and completely explain the technical solutions of the present invention, and to facilitate understanding thereof by those skilled in the art, and these technical solutions are described in the background art of the present invention, and therefore should not be construed as being known to those skilled in the art. Summary of the Invention [Problem to be solved by the invention]

[0006] In some cases, IAB node migration needs to be performed. IAB node migration is also called IAB node topology adaptation. For example, an IAB node decides to migrate from an original path to a new path after link quality measurement, where the original path is called source path and the new path is called target path. The IAB node that performs the migration is called migration IAB node.

[0007] One IAB node migration or topology adaptation scenario may include intra-IAB-donor-CU and inter-IAB-donor-CU migration or topology adaptation.

[0008] In the case of intra-IAB-donor-CU migration or topology adaptation scenario of one IAB node, both the source parent IAB node and the destination parent IAB node are served by the same IAB-donor-CU, the destination parent IAB node may use a different IAB donor DU (IAB-donor-DU) than the source parent IAB node, and the source path and the destination path may have common nodes.

[0009] Rel-17 eIAB can support inter-CU IAB migration, and in the case of IAB-donor-CU migration of an IAB node or topology adaptation scenario, the source parent IAB node and the destination parent IAB node are served by different IAB-donor-CUs, and the destination parent IAB node uses a different IAB-donor-DU than the source parent IAB node.

[0010] In the case of IAB-donor-CU migration / topology adaptation scenario of one IAB node, the migration or topology adaptation process or mechanism allows migration of all or some of the IAB nodes that this migrating IAB node serves directly or indirectly, i.e., child IAB nodes and / or end devices, assuming that the parent-child node relationships (including IAB nodes and end devices) remain unchanged in the new IAB-donor-CU.

[0011] The IAB-donor-CU migration or topology adaptation process of an IAB node includes three stages: (1) migration of the IAB-MT of the migration IAB node; (2) migration of the IAB-DU in the migration IAB node; and (3) migration of the terminal devices served by the migration IAB node and the child IAB nodes served by the IAB node, i.e., the IAB-MTs of the child nodes.

[0012] The above three steps may be independent processes, and the order of execution of steps (1) to (3) is not limited.

[0013] The inventors have found that, if steps (1) and (2) are performed first, and then step (3) is performed, the terminal device served by the migration IAB node detects a radio link failure (RLF) and then re-establishes a connection, which takes a relatively long time to complete the task. Also called traffic ) interruption. In order to overcome this drawback, if the migration IAB node first performs step (3), i.e., migration of the terminal devices served by the migration IAB node, and uses a signaling process similar to that of switching the IAB-MT in the migration IAB node, the following problem exists: when the migration IAB node first performs step (3), i.e., migration of these terminal devices, there is no F1 connection between the migration IAB node and the target IAB donor, so the response message (RRC reconfiguration complete message) sent by the terminal devices and / or child IAB nodes served by the migration IAB node to the migration IAB node may be transmitted to the source IAB donor. In other words, in such a case, the target IAB donor cannot know whether the terminal devices and / or child IAB nodes have completed step (3), and therefore cannot resume data transmission with them that was interrupted for performing the IAB-donor-CU migration or topology adaptation process of the IAB node.

[0014] To address one or more of the above problems, embodiments of the present invention provide a method and apparatus for migrating an IAB node. [Means for solving the problem]

[0015] According to a first aspect of an embodiment of the present invention, there is provided an IAB node migration apparatus, the apparatus being applied to a first IAB node, the apparatus comprising: a first receiving unit for receiving an RRC reconfiguration completion message of a terminal device and / or a descendant IAB node served by the first IAB node; and The device includes a first transmitting unit for transmitting a first uplink message including the RRC reconfiguration complete message to a target IAB (IAB-donor) donor node via a target route, or for transmitting the RRC reconfiguration complete message to a target IAB donor node by a source IAB donor node.

[0016] According to a second aspect of an embodiment of the present invention, there is provided a migration apparatus for an IAB node, the apparatus being applied to a first IAB donor node, the first IAB donor node being a source IAB donor node of the first IAB node, the apparatus comprising: a fifth receiving unit for receiving a second uplink message from the first IAB node, the second uplink message including an RRC reconfiguration complete message of a terminal device and / or a child IAB node served by the first IAB node; and A fifth sending unit is included for sending the RRC reconfiguration complete message to a target IAB donor node of the first IAB node.

[0017] According to a third aspect of an embodiment of the present invention, there is provided an IAB node migration apparatus, the apparatus being applied to a first IAB donor node, the first IAB donor node being a source IAB donor node of the first IAB node, the apparatus comprising: a seventh receiving unit for receiving a feedback message of a first downlink message including a first RRC reconfiguration message from the first IAB node; and Send a second downlink message to a source parent IAB node of the first IAB node, where the second downlink message includes a seventh transmission unit including a second RRC reconfiguration message.

[0018] According to a fourth aspect of an embodiment of the present invention, there is provided an IAB node migration apparatus, the apparatus being applied to a second IAB donor node, the second IAB donor node being a target IAB donor node of a first IAB node, the apparatus comprising: an eighth receiving unit for receiving a first uplink message, the first IAB node sending the first uplink message via a target route, the first uplink message including an RRC reconfiguration complete message; and / or Receive an Xn message or an NG message from a source IAB donor node, the RRC reconfiguration complete message including a ninth receiving unit which is an RRC reconfiguration complete message of a terminal device and / or a child IAB node served by the first IAB node.

[0019] According to a fifth aspect of an embodiment of the present invention, there is provided a network device, the network device comprising the device according to any one of the first to fourth aspects of the embodiment of the present invention.

[0020] According to a sixth aspect of an embodiment of the present invention, there is provided a communication system, the communication system including a first network device, a second network device and a terminal device, the first network device being a device as described in the second or third aspect of an embodiment of the present invention, and the second network device being a device as described in the fourth aspect of an embodiment of the present invention.

[0021] According to a seventh aspect of an embodiment of the present invention, there is provided a communication system, the communication system including a first network device and a terminal device, the first network device being a device according to the second aspect, the third aspect or the fourth aspect of the embodiment of the present invention.

[0022] According to an eighth aspect of an embodiment of the present invention, there is provided a communication system, the communication system including a first network device, a second network device, a third network device and a terminal device, the first network device being a device as described in the second or third aspect of an embodiment of the present invention, the second network device being a device as described in the fourth aspect of an embodiment of the present invention, and the third network device being a device as described in the first aspect of an embodiment of the present invention.

[0023] According to a ninth aspect of an embodiment of the present invention, a communication system is provided, the communication system including a first network device, a second network device, a third network device, a fourth network device and a terminal device, the first network device being a device as described in the second or third aspect of an embodiment of the present invention, the second network device being a device as described in the fourth aspect of an embodiment of the present invention, the third network device being a device as described in the first aspect of an embodiment of the present invention, and the fourth network device being a child node of a first IAB node.

[0024] According to a tenth aspect of an embodiment of the present invention, there is provided a migration method for an IAB node, the method being applied to a first IAB node, the method comprising: receiving an RRC reconfiguration complete message from a terminal device and / or a descendant IAB node served by the first IAB node; and This includes sending a first uplink message including the RRC reconfiguration complete message to a target IAB (IAB-donor) donor node via a target route, or sending the RRC reconfiguration complete message to the target IAB donor node by a source IAB donor node.

[0025] According to an eleventh aspect of an embodiment of the present invention, there is provided a migration method for an IAB node, the method being applied to a first IAB donor node, the first IAB donor node being a source IAB donor node of the first IAB node, the method comprising: receiving a second uplink message from the first IAB node, the second uplink message including an RRC reconfiguration complete message for a terminal device and / or a child IAB node served by the first IAB node; and The method includes sending the RRC reconfiguration complete message to the target IAB donor node of the first IAB node.

[0026] According to a twelfth aspect of an embodiment of the present invention, there is provided a migration method for an IAB node, the method being applied to a first IAB donor node, the first IAB donor node being a source IAB donor node of the first IAB node, the method comprising: receiving a feedback message of a first downlink message from the first IAB node, the feedback message including a first RRC reconfiguration message; and Sending a second downlink message to a source parent IAB node of the first IAB node, the second downlink message including a second RRC reconfiguration message.

[0027] According to a thirteenth aspect of an embodiment of the present invention, there is provided a migration method for an IAB node, the method being applied to a second IAB donor node, the second IAB donor node being a target IAB donor node of a first IAB node, the method comprising: receiving a first uplink message including an RRC reconfiguration complete message sent by the first IAB node via a target route; and / or Receive an Xn message or an NG message from a source IAB donor node, the RRC reconfiguration complete message being an RRC reconfiguration complete message of a terminal device and / or a child IAB node served by the first IAB node.

[0028] According to a fourteenth aspect of an embodiment of the present invention, a computer-readable program is provided, which, when executed in an IAB node migration device or a network device, causes the IAB node migration device or the network device to perform the IAB node migration method described in the eighth, ninth or tenth aspect of an embodiment of the present invention.

[0029] According to a fifteenth aspect of an embodiment of the present invention, a storage medium storing a computer-readable program is provided, in which the computer-readable program causes an IAB node migration device or a network device to execute an IAB node migration method described in the eighth, ninth or tenth aspect of an embodiment of the present invention. Effect of the Invention

[0030] One of the advantageous effects of the embodiment of the present invention is as follows: by sending a first uplink message including an RRC reconfiguration completion message to the target IAB donor node via the target route, or by sending an RRC reconfiguration completion message to the target IAB donor node via the source IAB donor node, the target IAB donor node can obtain the RRC reconfiguration completion message of the terminal device and / or child IAB node served by the migration IAB node, and can know whether the terminal device and / or child IAB node have completed route switching, thereby resuming data transmission with the terminal device and / or child IAB node that was interrupted to perform the IAB-donor-CU migration or topology adaptation process of the migration IAB node.

[0031] Specific embodiments of the present invention are disclosed in detail below with reference to the following description and drawings, which show how the principles of the present invention may be employed, but are not limited in scope to these embodiments, which may include various changes, modifications, and alternatives within the scope of the appended claims.

[0032] Additionally, features described and / or illustrated in one embodiment may be used in the same or similar manner in one or more other embodiments, may be combined with features in the other embodiments, or may be substituted for features in the other embodiments.

[0033] It should be noted that terms such as "comprise / have" when used in this specification refer to the presence of a feature, element, step, or assembly, but do not exclude the presence or addition of one or more other features, elements, steps, or assemblies. [Brief description of the drawings]

[0034] Elements and features described in one drawing or one embodiment of the invention may be combined with elements and features shown in one or more other drawings or embodiments, and in the drawings, like reference numerals are used to indicate corresponding parts in the several drawings and to indicate corresponding parts used in several embodiments.

[0035] The included drawings are used to provide a further understanding of the embodiments of the present invention, and these drawings constitute a part of this specification, illustrate the embodiments of the present invention, and together with the written description, are used to explain the principles of the present invention. Also, it is obvious that the drawings described below are only for illustrating some embodiments of the present invention, and a person skilled in the art can derive other drawings based on these drawings without creative labor. [Figure 1] FIG. 2 is a diagram showing the overall IAB architecture in an embodiment of the present invention. [Diagram 2] FIG. 2 is another diagram showing the overall IAB architecture in an embodiment of the present invention. [Diagram 3] FIG. 13 is a diagram showing the protocol stack of the F1-U interface between the IAB-DU and the IAB-donor-CU. [Figure 4] FIG. 13 is a diagram showing the protocol stack of the F1-C interface between the IAB-DU and the IAB-donor-CU. [Diagram 5] FIG. 13 is a diagram showing a protocol stack of an SRB between an IAB-MT and an IAB-donor-CU in an embodiment of the present invention. [Figure 6] A diagram showing a scenario of intra-IAB-donor-CU migration or topology adaptation of one IAB node in an embodiment of the present invention. [Figure 7] A diagram showing a scenario of IAB-donor-CU migration or topology adaptation of one IAB node in an embodiment of the present invention. [Figure 8] FIG. 2 is a diagram illustrating a migration method of an IAB node in the first embodiment of the present invention. [Figure 9] FIG. 8 is a diagram showing a method of implementing step 802 in the first embodiment of the present invention. [Figure 10] FIG. 8 is a diagram showing a method of implementing step 803 in the first embodiment of the present invention. [Figure 11] FIG. 11 is a diagram illustrating a migration method of an IAB node in a second embodiment of the present invention. [Figure 12] FIG. 11 is another diagram showing a migration method of an IAB node in the second embodiment of the present invention. [Figure 13] FIG. 11 is a diagram showing a migration method of an IAB node in a third embodiment of the present invention. [Figure 14] FIG. 11 is a diagram showing a migration method of an IAB node in a fourth embodiment of the present invention. [Figure 15] FIG. 11 is a diagram showing a migration method of an IAB node in a fifth embodiment of the present invention. [Figure 16] FIG. 23 is a diagram showing a migration method of an IAB node in a sixth embodiment of the present invention. [Figure 17] FIG. 13 is a diagram showing a migration device of an IAB node in embodiment 7 of the present invention. [Figure 18] FIG. 13 is a diagram illustrating a first transmitting unit according to a seventh embodiment of the present invention. [Figure 19] FIG. 13 is a diagram showing a migration device of an IAB node in an eighth embodiment of the present invention. [Figure 20] FIG. 13 is another diagram showing a migration device of an IAB node in embodiment 8 of the present invention. [Figure 21] FIG. 13 is a diagram showing a migration device of an IAB node in embodiment 9 of the present invention. [Figure 22]FIG. 23 is a block diagram showing a system configuration of a network device according to a tenth embodiment of the present invention. [Figure 23] FIG. 23 is a block diagram showing a system configuration of a network device according to an eleventh embodiment of the present invention. [Figure 24] FIG. 23 is a block diagram showing a system configuration of a network device according to a twelfth embodiment of the present invention. [Diagram 25] FIG. 23 is a diagram showing a communication system according to a thirteenth embodiment of the present invention. [Figure 26] FIG. 23 is another diagram showing a communication system according to the thirteenth embodiment of the present invention. [Figure 27] FIG. 23 is another diagram showing a communication system according to the thirteenth embodiment of the present invention. [Figure 28] FIG. 23 is another diagram showing a communication system according to the thirteenth embodiment of the present invention. [Figure 29] FIG. 23 is another diagram showing a communication system according to the thirteenth embodiment of the present invention. [Diagram 30] FIG. 23 is another diagram showing a communication system according to the thirteenth embodiment of the present invention. [Diagram 31] FIG. 23 is another diagram showing a communication system according to the thirteenth embodiment of the present invention. [Diagram 32] FIG. 23 is another diagram showing a communication system according to the thirteenth embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0036] The above and other features of the present invention will become apparent from the following detailed description and the accompanying drawings, in which: While the specification and drawings disclose certain embodiments of the present invention, these are illustrative of only some of the embodiments which may employ the principles of the present invention, and it is to be understood that the present invention is not limited to the described embodiments, but rather includes all modifications, variations and alternatives which fall within the scope of the appended claims.

[0037] In an embodiment of the present invention, the term "communication network" or "wireless communication network" may refer to a network conforming to any communication standard, such as Long Term Evolution (LTE), LTE-Advanced (LTE-A), Wideband Code Division Multiple Access (WCDMA), High-Speed ​​Packet Access (HSPA), etc.

[0038] Additionally, communication between devices in the communication system may be performed according to any stage of communication protocol, including, but not limited to, the following communication protocols: 1G (generation), 2G, 2.5G, 2.75G, 3G, 4G, 4.5G, and future 5G, New Radio (NR), and / or other conventional or future developed communication protocols.

[0039] In the embodiment of the present invention, the term "network device" refers to a device that connects a terminal device to a communication network and provides services to the terminal device in a communication system, for example, the network device may include, but is not limited to, a base station (BS), an access point (AP), a transmission reception point (TRP), a broadcast transmitter, a mobile management entity (MME), a network gateway, a server, a radio network controller (RNC), a base station controller (BSC), etc.

[0040] Among them, the base station may include, but is not limited to, the following: Node B (NodeB or NB), evolved Node B (eNodeB or eNB), 5G base station (gNB), etc., and may further include RRH (Remote Radio Head), RRU (Remote Radio Unit), relay, or low power node (e.g., femto, pico, etc.). In addition, the term "base station" may include some or all of the functions thereof, and each base station can provide communication coverage for a specific geographical area. The term "cell" may refer to a base station and / or the area it covers, depending on the context of the term.

[0041] In the embodiments of the present invention, the term "User Equipment" (UE) or "Terminal Equipment" (TE) refers to a device that accesses a communication network and receives services from the network, for example, via a network device. A User Equipment may be fixed or mobile, and may also be called a Mobile Station (MS), a terminal, a Subscriber Station (SS), an Access Terminal (AT), a station, etc.

[0042] Among them, user devices may include, but are not limited to, the following: cellular phones, personal digital assistants (PDAs), wireless modems, wireless communication devices, portable devices, machine type communication devices, laptop computers, cordless telephones, smartphones, smart watches, digital cameras, etc.

[0043] Furthermore, in scenarios such as the Internet of Things (IoT), the user equipment may also be a monitoring or measuring device or equipment, including, but not limited to, a Machine Type Communication (MTC) terminal, an in-vehicle communication terminal, a Device to Device (D2D) terminal, a Machine to Machine (M2M) terminal, etc.

[0044] The following describes an example scenario of the present invention, but the present invention is not limited thereto.

[0045] FIG. 1 is a diagram showing an IAB overall architecture of an embodiment of the present invention. As shown in FIG. 1, the IAB overall architecture uses a duplex (SA) mode. FIG. 2 is another diagram showing an IAB overall architecture of an embodiment of the present invention. As shown in FIG. 2, the IAB overall architecture uses a dual connectivity (EN-DC) mode. In the dual connectivity mode, an IAB node is connected to one MeNB by E-UTRA, and an IAB donor terminates X2-C as an SgNB.

[0046] Figure 3 is a diagram showing a protocol stack of the F1-U interface between the IAB-DU and the IAB-donor-CU. Figure 4 is a diagram showing a protocol stack of the F1-C interface between the IAB-DU and the IAB-donor-CU. In Figures 3 and 4, F1-U and F1-C are described using a two-hop backhaul as an example.

[0047] In the embodiment of the present invention, F1-U and F1-C use an IP transmission layer between IAB-DU and IAB-donor-CU, and F1-U and F1-C have security protection. In an embodiment of the present invention, in the wireless backhaul, the IP layer is transmitted by a Backhaul Adaptation Protocol (BAP) sublayer, which ensures multi-hop routing, and the IP layer may be used for non-F1 tasks, such as Operation Administration and Maintenance (OAM) tasks.

[0048] In an embodiment of the present invention, in each backhaul link, the BAP PDUs are transmitted by a BH RLC channel, and in each BH link, multiple BH RLC channels can be configured, thus allowing traffic prioritization and Quality of Service (QoS) enforcement.

[0049] In an embodiment of the present invention, the BAP entity on each IAB node and IAB-donor-DU performs the mapping of BAP PDUs to BH RLC channels.

[0050] In an embodiment of the present invention, the IAB-MT establishes SRBs with the IAB-donor-CU to carry RRC and NAS. Figure 5 shows a protocol stack diagram of the SRB between the IAB-MT and the IAB-donor-CU in an embodiment of the present invention.

[0051] In an embodiment of the present invention, for an IAB node operating under EN-DC mode, the IAB-MT further establishes one or more DRBs with the IAB-donor-CU, which may be used, for example, to transport OAM services. For SA mode, the establishment of DRBs is optional. These SRBs and DRBs are transported between this IAB-MT and its parent node via the Uu interface channel.

[0052] Figure 6 illustrates a scenario of intra-IAB-donor-CU migration or topology adaptation of one IAB node according to an embodiment of the present invention. As shown in Figure 6, IAB-node 5 is a migration IAB node, IAB-node 3 is the source parent IAB node of IAB-node 5, IAB-node 4 is the destination parent IAB node of IAB-node 5, and IAB-node 3 and IAB-node 4 are connected to the same IAB-donor-CU and different IAB-donor-DU. UE1 is a terminal device served by IAB-node 5, and IAB-node 6 is a child IAB node served by IAB-node 5.

[0053] Figure 7 illustrates a scenario of IAB-donor-CU migration or topology adaptation of one IAB node according to an embodiment of the present invention. As shown in Figure 7, IAB-node 5 is a migration node, IAB-node 3 is a source parent IAB node of IAB-node 5, IAB-node 4 is a destination parent IAB node of IAB-node 5, and IAB-node 3 and IAB-node 4 are connected to different IAB-donor-CU and different IAB-donor-DU. UE1 is a terminal device served by IAB-node 5, and IAB-node 6 is a child IAB node served by IAB-node 5.

[0054] For step (1) in the IAB-donor-CU inter-migration or topology adaptation process of one IAB node as described above, migration of the IAB-MT of the migrating IAB node means switching the IAB-MT of IAB-node 5 from the source path to the target path; for step (2), migration of the IAB-DU in the migrating IAB node means switching the IAB-DU of IAB-node 5 from IAB-donor-CU1 to IAB-donor-CU2; and for step (3), migration of the terminal device served by the migrating IAB node and the child IAB node served by this IAB node, i.e., the IAB-MTs of the child node, means switching IAB-node 6 and UE1.

[0055] In order to overcome the drawback of service interruption caused by the terminal device re-establishing a connection after detecting a radio link failure (RLF), if step (3) is performed first, i.e., migration of the terminal device served by the migration IAB node and the child IAB node served by this IAB node, i.e., the IAB-MTs of the child node, i.e., switching of IAB-node 6 and UE1 is performed first, and a signaling process similar to that of switching of IAB-MT in the migration IAB node is used, the following problem exists: namely, since step (3) is performed first, i.e., there is no F1 connection between IAB-node 5 and IAB-donor-CU2, the RRC reconfiguration completion message sent by IAB-node 6 and UE1 to IAB-node 5 may be transmitted to IAB-donor-CU1. In other words, IAB-donor-CU2 cannot know whether IAB-node 6 and UE1 have completed the switch, and therefore cannot resume data transmission with IAB-node 5 that was interrupted due to the migration or topology adaptation process between IAB-donor-CU1 and IAB-donor-CU2.

[0056] Various embodiments of the present invention will now be described with reference to the accompanying drawings, in which: It should be noted that these embodiments are merely illustrative and are not intended to limit the present invention. EXAMPLES

[0057] In an embodiment of the present invention, a method for migrating an IAB node is provided, and the apparatus is applied in a first IAB node.

[0058] 8 is a diagram illustrating a migration method for an IAB node according to the first embodiment of the present invention. As shown in FIG. 8, the method includes the following steps:

[0059] Step 801: The first IAB node receives an RRC reconfiguration complete message from a terminal device and / or a child IAB node that the first IAB node serves; and Step 802: Send a first uplink message including the RRC reconfiguration complete message to a target IAB donor node via a target route; or Step 803: The source IAB donor node sends the RRC reconfiguration complete message to the target IAB donor node.

[0060] This allows the target IAB donor to obtain an RRC reconfiguration completion message of the terminal device and / or child IAB node served by the migration IAB node, thereby enabling the target IAB donor to know whether the terminal device and / or child IAB node have completed route switching, thereby enabling the target IAB donor to resume data transmission with the terminal device and / or child IAB node that was interrupted to perform the IAB-donor-CU migration or topology adaptation process of the migration IAB node.

[0061] In an embodiment of the present invention, the first IAB node is a migration IAB node.

[0062] In an embodiment of the present invention, the terminal device served by the first IAB node may be at least one terminal device, and the child IAB node served by the first IAB node may be at least one child node. The terminal device and / or child IAB node that transmits an RRC reconfiguration complete message to the first IAB node may be all terminal devices and / or all child IAB nodes served by the first IAB node, or may be some terminal devices and / or some child IAB nodes served by the first IAB node.

[0063] In an embodiment of the present invention, the source IAB donor node is also referred to as the source IAB donor, which represents the end point of the backhaul on the source route on the network side, and the target IAB donor node is also referred to as the target IAB donor, which represents the end point of the backhaul on the target route on the network side.

[0064] In step 801, the first IAB node receives an RRC reconfiguration completion message from a terminal device and / or child IAB node served by the first IAB node, and the RRC reconfiguration completion message is an RRC reconfiguration completion message protected (integrity protected and encrypted) by a key set by the target IAB donor node, which the terminal device and / or child IAB node sends to the first IAB node by applying the settings in the RRC reconfiguration message (including the security settings set by the target IAB donor node) after completing RRC reconfiguration using the security settings set by the target IAB donor node.

[0065] In step 802, the first IAB node sends a first uplink message including the RRC reconfiguration complete message to the target IAB donor node via the target route.

[0066] In an embodiment of the present invention, the target path is an F1 interface between a distributed unit (DU) of the first IAB node and a central unit (CU) of the target IAB donor node.

[0067] For example, the first uplink message is a first F1 message.

[0068] In the embodiment of the present invention, the F1 message refers to a control message transmitted through the F1 interface, and the F1 interface refers to the interface between the IAB-DU and the IAB-donor-CU.

[0069] In an embodiment of the present invention, for example, the first F1 message may be at least one of a terminal device context establishment response message and a terminal device context modification response message.

[0070] For example, the RRC reconfiguration completion message of the terminal device corresponding to the terminal device context establishment response message or the terminal device context modification response message is included in the terminal device context establishment response message or the terminal device context modification response message; or The terminal device context establishment response message or the terminal device context modification response message includes at least one of the RRC reconfiguration completion messages, and for one of the at least one RRC reconfiguration completion messages, the terminal device that transmits the RRC reconfiguration completion message is the same as or different from the terminal device associated with the terminal device context establishment response message or the terminal device context modification response message. For example, the terminal device context establishment response message or the terminal device context modification response message includes two RRC reconfiguration completion messages, of which one RRC reconfiguration completion message is from a terminal corresponding to the terminal device context establishment response message or the terminal device context modification response message, and the other RRC reconfiguration completion message is from a terminal different from the terminal corresponding to the terminal device context establishment response message or the terminal device context modification response message.

[0071] Also in the embodiment of the present invention, for example, the first F1 message is an uplink RRC message transfer message.

[0072] For example, all RRC reconfiguration complete messages are included in one uplink RRC message transmission message; or The RRC reconfiguration complete messages sent by all terminal devices are included in one uplink RRC message transmission message, and the RRC reconfiguration complete messages sent by all IAB child nodes are included in one different uplink RRC message transmission message; or An RRC reconfiguration completion message sent by a terminal device or an IAB child node served by one IAB node is included in one uplink RRC message transmission message, and an RRC reconfiguration completion message sent by a terminal device or an IAB child node served by another IAB node is included in one different uplink RRC message transmission message; or An RRC reconfiguration completion message transmitted by a terminal device served by one IAB node is included in one uplink RRC message transmission message, and an RRC reconfiguration completion message transmitted by an IAB child node served by this IAB node is included in one different uplink RRC message transmission message.

[0073] In an embodiment of the present invention, for example as shown in FIG. 8, the method further includes the following steps:

[0074] Step 804: Receive a first instruction.

[0075] The first instruction information is used to indicate that the RRC reconfiguration complete message is an RRC reconfiguration complete message protected by security settings configured by the target IAB donor node, or to indicate that the RRC reconfiguration complete message is to be sent to the target IAB donor node, or to indicate that the first IAB node stores the RRC reconfiguration complete message.

[0076] In the embodiment of the present invention, step 804 and step 801 may be executed simultaneously or one after the other, and the execution order of these two steps is not limited in the embodiment of the present invention.

[0077] For example, a terminal device and / or a child IAB node that transmits an RRC reconfiguration complete message to a first IAB node includes the first indication information in a lower layer when transmitting the RRC reconfiguration complete message and transmits it to the first IAB node.

[0078] In an embodiment of the present invention, the first indication information is used to indicate an RRC message in the same RLC PDU or MAC PDU.

[0079] For example, the first indication information is included in an RLC unit header or a MAC unit header.

[0080] In an embodiment of the present invention, when the first IAB node IAB-DU receives the first indication information, the MAC layer or the RLC layer or the BAP layer in the distributed unit (IAB-DU) of the first IAB node stores the RRC reconfiguration complete message.

[0081] For example, the first IAB node receives a data packet transmitted by one terminal device and / or child IAB node, the MAC layer unpacks and receives the first indication information and one MAC SDU, and the MAC layer stores the MAC SDU, or the first IAB node receives a data packet transmitted by one terminal device and / or child IAB node, the RLC layer unpacks and receives the first indication information and one RLC SDU, and the RLC layer stores the RLC SDU.

[0082] Further, the following may be included: when the first IAB node IAB-DU receives the first indication information, the BAP layer of the IAB-MT stores the RRC reconfiguration complete message.

[0083] If the first indication information is from a child IAB node served by the first IAB node, the first indication information may be further included in a BAP unit header, and a BAP layer of an IAB-MT or an IAB-DU stores the RRC reconfiguration complete message, and may further include a BAP of an IAB-DU of the first IAB node transmitting the first indication information to a BAP layer of an IAB-MT.

[0084] In addition, the method may further include the following: the MAC layer of the IAB-DU of the first IAB node transmits the first indication information to the RLC layer. For example, the first IAB node receives a data packet transmitted by a terminal device and / or a child IAB node, the MAC layer unpacks and receives the first indication information and an RLC SDU, the MAC layer transmits the first indication information and the MAC SDU, i.e., the RLC PDU, to the RLC layer, the RLC layer unpacks and obtains the RLC SDU, and stores the RLC SDU.

[0085] In addition, the following may be included: the MAC layer of the IAB-DU of the first IAB node transmits the first indication information to the BAP layer. For example, the first IAB node receives a data packet transmitted by a terminal device and / or a child IAB node, the MAC layer unpacks and receives the first indication information and one RLC SDU, the MAC layer transmits the first indication information and the MAC SDU, i.e., the RLC PDU, to the RLC layer, the RLC layer unpacks and obtains the RLC SDU, transmits the first indication information and the RLC SDU, i.e., the BAP PDU, to the BAP layer, the BAP layer unpacks and obtains the BAP SDU, and stores the BAP SDU.

[0086] In addition, the following may be included: the RLC layer of the IAB-DU of the first IAB node transmits the first indication information to the BAP layer. For example, the first IAB node receives a data packet sent by a terminal device and / or a child IAB node, the RLC layer unpacks and receives the first indication information and an RLC SDU, and transmits the first indication information and the RLC SDU, i.e., the BAP PDU, to the BAP layer, and the BAP layer unpacks and obtains a BAP SDU, and stores the BAP SDU.

[0087] In step 802, a first uplink message including the RRC reconfiguration complete message is sent to a target IAB donor node via a target route. Figure 9 is a diagram showing a method of implementing step 802 in the first embodiment of the present invention. As shown in Figure 9, the method includes the following steps:

[0088] Step 901: store the RRC reconfiguration complete message; Step 902: Establish the target path; and Step 903: Send the first uplink message to a target IAB donor node via the target route.

[0089] In an embodiment of the present invention, with respect to the first IAB node, the RRC message may be invisible, in other words, the first IAB node only knows that one RLC / MAC SDU is stored, and does not need to know the content that this RLC / MAC SDU contains, e.g., the RRC reconfiguration complete message.

[0090] In an embodiment of the present invention, when a first IAB node receives an RRC reconfiguration complete message from a terminal device and / or a child IAB node served by the first IAB node, the first IAB node first stores the RRC reconfiguration complete message and establishes the target route, and then the first IAB node transmits the first uplink message including the RRC reconfiguration complete message to a target IAB donor node via the target route.

[0091] In an embodiment of the present invention, a source IAB donor node sends a second downlink message to a source parent IAB node of a first IAB node, for example, the second downlink message is an F1 message, for example, the second downlink message is a UE Context Modification Request message or a DL RRC Message Transfer message, the second downlink message includes a second RRC reconfiguration message, and the second RRC reconfiguration message is from a target IAB donor. After receiving the second downlink message, the source parent IAB node of the first IAB node sends the second RRC reconfiguration message to the first IAB node.

[0092] As shown in FIG. 9, for example, the method further includes the following steps.

[0093] Step 904: receiving a second RRC reconfiguration message from a source parent IAB node; Step 905: Initiate a random access procedure to a target parent node of the first IAB node based on the second RRC reconfiguration message; and Step 906: Switch to the target route.

[0094] In an embodiment of the present invention, based on the instruction in the second downlink message, the source parent IAB node can suspend operations with the first IAB node, so that operations of the terminal device and / or child IAB node served by the first IAB node can also be suspended.

[0095] In an embodiment of the present invention, a first IAB node may control interruptions in service with its serving end devices and / or child IAB nodes.

[0096] For example, the first IAB node stores the received second RRC reconfiguration message from the source parent IAB node, and continues to transmit service to the terminal device and / or the child IAB node served by the first IAB node until the first IAB node interrupts service with the terminal device and / or the child IAB node based on an instruction, a realization, a timer, or a number and / or a ratio. In this way, the interruption of service of the terminal device and / or the child IAB node served by the first IAB node can be reduced.

[0097] In an embodiment of the present invention, for example, when a first condition is satisfied, the first IAB node suspends service with the end device and / or the child IAB node.

[0098] For example, the first conditions may include at least one of the following conditions:

[0099] The first IAB node transmits an RRC reconfiguration message to all terminal devices and / or child IAB nodes served by the first IAB node, or receives an RRC reconfiguration completion message from all terminal devices and / or child IAB nodes served by the first IAB node; The first timer has expired; the number of terminal devices and / or child IAB nodes that have transmitted an RRC reconfiguration message, received feedback of an RRC reconfiguration message, or received an RRC reconfiguration complete message by the first IAB node reaches a first set value, and / or the ratio of terminal devices and / or child IAB nodes that have transmitted an RRC reconfiguration message, received feedback of an RRC reconfiguration message, or received an RRC reconfiguration complete message by the first IAB node reaches a first ratio; and The number of RRC reconfiguration messages sent by the first IAB node to the terminal device and / or child IAB node served by the first IAB node, or the number of feedbacks of RRC reconfiguration messages received for the terminal device and / or child IAB node served by the first IAB node, or the number of RRC reconfiguration completion messages received for the terminal device and / or child IAB node served by the first IAB node, reaches a second set value, and / or the ratio of RRC reconfiguration messages sent by the first IAB node to the terminal device and / or child IAB node served by the first IAB node, or the ratio of feedbacks of RRC reconfiguration messages received for the terminal device and / or child IAB node served by the first IAB node, or the ratio of RRC reconfiguration completion messages received for the terminal device and / or child IAB node served by the first IAB node reaches a second ratio.

[0100] Various cases will be described below as examples.

[0101] 1) The first IAB node can suspend operations with the terminal device and / or the child IAB node based on an instruction, for example, based on implementation. For example, when the first IAB node transmits RRC reconfiguration messages for all terminal devices and / or child IAB nodes it serves, or receives RRC reconfiguration completion messages for most terminal devices and / or child IAB nodes, it suspends operations with the terminal device and / or the child IAB node, and initiates a random access procedure to the target parent IAB node by applying new settings stored before in the second RRC reconfiguration message from the source parent IAB node.

[0102] For example, when the first IAB node has sent an RRC reconfiguration message for all terminal devices it serves, or has received an RRC reconfiguration complete message for most of the terminal devices, it suspends operations with all of these terminal devices or with the terminal devices that have received the RRC reconfiguration complete messages.

[0103] Also, for example, when a first IAB node has sent an RRC reconfiguration message for all child IAB nodes it serves, or has received RRC reconfiguration complete messages from a majority of the child IAB nodes, it suspends operations with all of these child IAB nodes or with these child IAB nodes that have received the RRC reconfiguration complete messages.

[0104] Also, for example, when the first IAB node has sent an RRC reconfiguration message for all terminal devices and all child IAB nodes it serves, or when it has received an RRC reconfiguration completion message for most of the terminal devices and child IAB nodes, it suspends operations with all of these terminal devices and child IAB nodes, or suspends operations with these terminal devices and child IAB nodes that have received the RRC reconfiguration completion messages.

[0105] 2) The first IAB node may suspend service with the terminal device and / or the child IAB node based on a timer. For example, when the first timer expires, the first IAB node suspends service with the terminal device and / or the child IAB node that it serves, and initiates a random access procedure to the target parent IAB node by applying a previously stored second RRC reconfiguration message from the source parent IAB node. For example, the first IAB node may start the first timer immediately upon receiving the value of the first timer, or may start the first timer upon receiving the value of the first timer and receiving a second RRC reconfiguration message from the target IAB donor node transmitted by the source parent IAB node.

[0106] For example, when the first timer expires, service with the serving terminal is discontinued.

[0107] Also, for example, when the first timer expires, the service with the serving child IAB node is discontinued.

[0108] Also, for example, when the first timer expires, service with the serving terminal device and child IAB node is suspended.

[0109] 3) The first IAB node may suspend service with the terminal device and / or child IAB node based on the number and / or ratio of terminal devices and / or child IAB nodes, or the number and / or ratio of messages sent, or the number and / or ratio of messages or feedback received, for example, when the number of terminal devices and / or child IAB nodes that have sent an RRC reconfiguration message or received an RRC reconfiguration message feedback by the first IAB node reaches a first set value, and / or when the number of terminal devices and / or child IAB nodes that have sent an RRC reconfiguration message or received an RRC reconfiguration completion message by the first IAB node reaches a first set value, and / or when the number of terminal devices and / or child IAB nodes that have sent an RRC reconfiguration message or received an RRC reconfiguration completion message by the first IAB node reaches a first set value. When the ratio of terminal devices and / or child IAB nodes that have received an RRC reconfiguration completion message reaches a first ratio, the first IAB node suspends operations with all of these terminal devices and / or child IAB nodes, or suspends operations with these terminal devices and / or child IAB nodes that have sent an RRC reconfiguration message or received feedback of an RRC reconfiguration message; in other words, the first IAB node suspends operations with the terminal devices and / or child IAB nodes based on the number and / or ratio of terminal devices and / or child IAB nodes that have sent an RRC reconfiguration message, received feedback of an RRC reconfiguration message, or received an RRC reconfiguration completion message.

[0110] Alternatively, the number of RRC reconfiguration messages transmitted by the first IAB node to a terminal device and / or a child IAB node served by the first IAB node, or the number of feedbacks of RRC reconfiguration messages of the terminal device and / or the child IAB node served by the first IAB node received, or the number of RRC reconfiguration completion messages of the terminal device and / or the child IAB node served by the first IAB node received, has reached a second setting value, and / or the ratio of RRC reconfiguration messages transmitted by the first IAB node to a terminal device and / or a child IAB node served by the first IAB node, or the ratio of feedbacks of RRC reconfiguration messages of the terminal device and / or the child IAB node served by the first IAB node received, has reached a second setting value. When the ratio of feedback of RRC reconfiguration messages sent by the first IAB node to the terminal device and / or child IAB node served by the first IAB node, or the ratio of RRC reconfiguration completion messages received by the first IAB node for the terminal device and / or child IAB node served by the first IAB node, reaches a second ratio, the first IAB node suspends operations with the terminal device and / or child IAB node; in other words, the first IAB node suspends operations with the terminal device and / or child IAB node based on the number and / or ratio of feedback of RRC reconfiguration messages sent by the first IAB node to the terminal device and / or child IAB node served by the first IAB node, or the number and / or ratio of RRC reconfiguration completion messages received from the terminal device and / or child IAB node.

[0111] For example, when the number of terminal devices to which the first IAB node has transmitted an RRC reconfiguration message or received an RRC reconfiguration message feedback, or received an RRC reconfiguration completion message reaches a first setting value, and / or the ratio of terminal devices to which the first IAB node has transmitted an RRC reconfiguration message or received an RRC reconfiguration message feedback, or received an RRC reconfiguration completion message reaches a first ratio, the first IAB node suspends service with all of these terminal devices, or suspends service with these terminal devices to which the first IAB node has transmitted an RRC reconfiguration message or received an RRC reconfiguration message feedback, or when the number of RRC reconfiguration messages transmitted or received by the first IAB node to the terminal devices served by the first IAB node reaches a first setting value, When the number of RRC reconfiguration message feedbacks of terminal devices served by the AB node or the number of RRC reconfiguration completion messages received of terminal devices served by the first IAB node reaches a second set value, and / or the ratio of RRC reconfiguration messages sent by the first IAB node to terminal devices served by the first IAB node or the ratio of RRC reconfiguration message feedbacks received of terminal devices served by the first IAB node or the ratio of RRC reconfiguration completion messages received of terminal devices served by the first IAB node reaches a second ratio, the first IAB node suspends operations with all these terminal devices or suspends operations with the terminal devices that have sent these RRC reconfiguration messages or received these RRC reconfiguration message feedbacks.

[0112] Also, for example, when the number of child IAB nodes from which the first IAB node has transmitted an RRC reconfiguration message or received an RRC reconfiguration message feedback, or received an RRC reconfiguration completion message reaches a first setting value, and / or the ratio of child IAB nodes from which the first IAB node has transmitted an RRC reconfiguration message or received an RRC reconfiguration message feedback, or received an RRC reconfiguration completion message reaches a first ratio, the first IAB node suspends operations with all of these child IAB nodes, or suspends operations with these child IAB nodes from which the first IAB node has transmitted an RRC reconfiguration message or received an RRC reconfiguration message feedback, or when the number of RRC reconfiguration messages transmitted or received by the first IAB node to child IAB nodes served by the first IAB node reaches a first setting value, and / or the ratio of child IAB nodes from which the first IAB node has transmitted an RRC reconfiguration message or received an RRC reconfiguration completion message reaches a first ratio, the first IAB node suspends operations with all of these child IAB nodes, or suspends operations with these child IAB nodes from which the first IAB node has transmitted an RRC reconfiguration message or received an RRC reconfiguration message feedback, or when the number of RRC reconfiguration messages transmitted or received by the first IAB node to child IAB nodes served by the first IAB node reaches a first setting value, When the number of RRC reconfiguration message feedbacks for child IAB nodes served by the first IAB node or the number of RRC reconfiguration completion messages received for child IAB nodes served by the first IAB node reaches a second set value, and / or the ratio of RRC reconfiguration messages sent by the first IAB node to child IAB nodes served by the first IAB node or the ratio of RRC reconfiguration message feedbacks received for child IAB nodes served by the first IAB node or the ratio of RRC reconfiguration completion messages received for child IAB nodes served by the first IAB node reaches a second ratio, the first IAB node suspends operations with all these child IAB nodes or suspends operations with child IAB nodes that have sent these RRC reconfiguration messages or received these RRC reconfiguration message feedbacks.

[0113] Also, for example, when the number of terminal devices and child IAB nodes from which the first IAB node has transmitted an RRC reconfiguration message, received feedback of an RRC reconfiguration message, or received an RRC reconfiguration completion message reaches a first setting value, and / or the ratio of terminal devices and child IAB nodes from which the first IAB node has transmitted an RRC reconfiguration message, received feedback of an RRC reconfiguration message, or received an RRC reconfiguration completion message reaches a first ratio, the first IAB node suspends operations with all of these terminal devices and child IAB nodes, or suspends operations with these terminal devices and child IAB nodes from which the first IAB node has transmitted an RRC reconfiguration message or received feedback of an RRC reconfiguration message, or the number of RRC reconfiguration messages transmitted by the first IAB node to the terminal devices and child IAB nodes served by the first IAB node, or the number of RRC reconfiguration messages received by the first IAB node, When the number of feedbacks of RRC reconfiguration messages for terminal devices and child IAB nodes served by the first IAB node, or the number of RRC reconfiguration completion messages received for terminal devices and child IAB nodes served by the first IAB node, reaches a second set value, and / or the ratio of RRC reconfiguration messages sent by the first IAB node to terminal devices and child IAB nodes served by the first IAB node, or the ratio of feedbacks of RRC reconfiguration messages received for terminal devices and child IAB nodes served by the first IAB node, or the ratio of RRC reconfiguration completion messages received for terminal devices and child IAB nodes served by the first IAB node, reaches a second ratio, the first IAB node suspends operations with all of these terminal devices and child IAB nodes, or suspends operations with the terminal devices and child IAB nodes that have sent RRC reconfiguration messages or received RRC reconfiguration message feedback.

[0114] Also, for example, when the number of terminal devices to which the first IAB node has transmitted an RRC reconfiguration message, or has received feedback of an RRC reconfiguration message, or has received an RRC reconfiguration completion message reaches a first setting value, and / or the ratio of terminal devices to which the first IAB node has transmitted an RRC reconfiguration message, or has received feedback of an RRC reconfiguration message, or has received an RRC reconfiguration completion message reaches a first ratio, the first IAB node suspends operations with all of these terminal devices and child IAB nodes, or suspends operations with these terminal devices and all child IAB nodes to which the first IAB node has transmitted an RRC reconfiguration message or has received feedback of an RRC reconfiguration message, or when the number of RRC reconfiguration messages transmitted by the first IAB node to terminal devices served by the first IAB node or the ratio of terminal devices to which the first IAB node has received an RRC reconfiguration completion message reaches a first ratio, the first IAB node suspends operations with all of these terminal devices and child IAB nodes, or suspends operations with these terminal devices and all child IAB nodes to which the first IAB node has transmitted an RRC reconfiguration message or has received feedback of an RRC reconfiguration message, or when the number of RRC reconfiguration messages transmitted by the first IAB node to terminal devices served by the first IAB node reaches a first setting value, When the number of feedbacks of RRC reconfiguration messages of terminal devices served by a first IAB node, or the number of RRC reconfiguration completion messages received of terminal devices served by the first IAB node, reaches a second set value, and / or the ratio of RRC reconfiguration messages sent by the first IAB node to terminal devices served by the first IAB node, or the ratio of feedbacks of RRC reconfiguration messages received of terminal devices served by the first IAB node, or the ratio of RRC reconfiguration completion messages received of terminal devices served by the first IAB node, reaches a second ratio, the first IAB node suspends operations with all these terminal devices and child IAB nodes, or suspends operations with these terminal devices and all child IAB nodes that have sent RRC reconfiguration messages or received feedback of RRC reconfiguration messages.

[0115] Also, for example, when the number of child IAB nodes at which the first IAB node has transmitted an RRC reconfiguration message or received an RRC reconfiguration message feedback, or received an RRC reconfiguration completion message reaches a first setting value, and / or the ratio of child IAB nodes at which the first IAB node has transmitted an RRC reconfiguration message or received an RRC reconfiguration message feedback, or received an RRC reconfiguration completion message reaches a first ratio, the first IAB node suspends service with all of these terminal devices and child IAB nodes, or suspends service with all of these terminal devices and child IAB nodes at which the first IAB node has transmitted an RRC reconfiguration message or received an RRC reconfiguration message feedback, or when the number of RRC reconfiguration messages transmitted by the first IAB node to the child IAB nodes served by the first IAB node or the number of RRC reconfiguration messages received by the first IAB node reaches a first setting value, and / or the ratio of child IAB nodes at which the first IAB node has transmitted an RRC reconfiguration message or received an RRC reconfiguration completion message reaches a first ratio, the first IAB node suspends service with all of these terminal devices and child IAB nodes at which the first IAB node has transmitted an RRC reconfiguration message or received an RRC reconfiguration message feedback. When the number of RRC reconfiguration message feedbacks of child IAB nodes served by the first IAB node or the number of RRC reconfiguration completion messages received of child IAB nodes served by the first IAB node reaches a second set value, and / or the ratio of RRC reconfiguration messages sent by the first IAB node to child IAB nodes served by the first IAB node or the ratio of RRC reconfiguration message feedbacks received of child IAB nodes served by the first IAB node or the ratio of RRC reconfiguration completion messages received of child IAB nodes served by the first IAB node reaches a second ratio, the first IAB node suspends operations with all these terminal devices and child IAB nodes, or suspends operations with all terminal devices and these child IAB nodes that have sent RRC reconfiguration messages or received RRC reconfiguration message feedback.

[0116] In an embodiment of the present invention, the ratio of terminal devices and / or child IAB nodes to which the first IAB node has sent an RRC reconfiguration message, received feedback of an RRC reconfiguration message, or received an RRC reconfiguration completion message refers to the ratio of the number of terminal devices and / or child IAB nodes to which the first IAB node has sent an RRC reconfiguration message, received feedback of an RRC reconfiguration message, or received an RRC reconfiguration completion message, to the total number of terminal devices and / or child IAB nodes served by the first IAB node.

[0117] For example, the ratio of terminal devices to which the first IAB node has sent an RRC reconfiguration message, received feedback of an RRC reconfiguration message, or received an RRC reconfiguration completion message refers to the ratio of the number of terminal devices to which the first IAB node has sent an RRC reconfiguration message, received feedback of an RRC reconfiguration message, or received an RRC reconfiguration completion message, to the total number of terminal device child IAB nodes served by the first IAB node.

[0118] For example, the ratio of child IAB nodes to which the first IAB node has sent an RRC reconfiguration message, received feedback of an RRC reconfiguration message, or received an RRC reconfiguration complete message refers to the ratio of the number of child IAB nodes to which the first IAB node has sent an RRC reconfiguration message, received feedback of an RRC reconfiguration message, or received an RRC reconfiguration complete message, to the total number of child IAB nodes of the first IAB node.

[0119] For example, the ratio of terminal devices and child IAB nodes to which the first IAB node has sent an RRC reconfiguration message, received feedback of an RRC reconfiguration message, or received an RRC reconfiguration completion message refers to the ratio of the number of terminal devices and child IAB nodes to which the first IAB node has sent an RRC reconfiguration message, received feedback of an RRC reconfiguration message, or received an RRC reconfiguration completion message, to the total number of terminal devices and child IAB nodes served by the first IAB node.

[0120] In an embodiment of the present invention, the ratio of the number of RRC reconfiguration messages sent by the first IAB node to the terminal device and / or child IAB node served by the first IAB node, or the feedback of the RRC reconfiguration messages received by the first IAB node to the terminal device and / or child IAB node served by the first IAB node, or the RRC reconfiguration completion messages received by the terminal device and / or child IAB node served by the first IAB node refers to the ratio of the number of RRC reconfiguration messages sent by the first IAB node to the terminal device and / or child IAB node served by the first IAB node, or the feedback of the RRC reconfiguration messages received by the terminal device and / or child IAB node served by the first IAB node, or the RRC reconfiguration completion messages received by the terminal device and / or child IAB node served by the first IAB node to the number of RRC reconfiguration messages sent by the first IAB node.

[0121] For example, in an embodiment of the present invention, the ratio of the number of RRC reconfiguration messages sent by the first IAB node to the terminal device and / or child IAB node served by the first IAB node, or the feedback of the RRC reconfiguration message received by the first IAB node, or the RRC reconfiguration completion message received by the terminal device served by the first IAB node refers to the ratio of the number of RRC reconfiguration messages sent by the first IAB node to the terminal device and / or child IAB node served by the first IAB node, or the feedback of the RRC reconfiguration message received by the terminal device served by the first IAB node, or the RRC reconfiguration completion message received by the terminal device served by the first IAB node to the number of RRC reconfiguration messages sent by the first IAB node.

[0122] For example, in an embodiment of the present invention, the ratio of the number of RRC reconfiguration messages sent by the first IAB node to a child IAB node of the first IAB node, or the feedback of the RRC reconfiguration message received by the child IAB node of the first IAB node, or the RRC reconfiguration completion message received by the child IAB node of the first IAB node refers to the ratio of the number of RRC reconfiguration messages sent by the first IAB node to a child IAB node of the first IAB node, or the feedback of the RRC reconfiguration message received by the child IAB node of the first IAB node, or the RRC reconfiguration completion message received by the child IAB node of the first IAB node, to the number of RRC reconfiguration messages sent by the first IAB node.

[0123] For example, the ratio of the number of RRC reconfiguration messages that the first IAB node sends to the terminal device and child IAB node served by the first IAB node, or the feedback of RRC reconfiguration messages received from the terminal device and child IAB node served by the first IAB node, or the RRC reconfiguration completion messages received from the terminal device and child IAB node served by the first IAB node refers to the ratio of the number of RRC reconfiguration messages that the first IAB node sends to the terminal device and child IAB node served by the first IAB node, or the feedback of RRC reconfiguration messages received from the terminal device and child IAB node served by the first IAB node, or the RRC reconfiguration completion messages received from the terminal device and child IAB node served by the first IAB node, to the number of RRC reconfiguration messages sent by the first IAB node.

[0124] The above describes a case where the first IAB node controls the interruption of service with the terminal device and / or child IAB node that it serves. In this case, the first IAB node stores the received RRC reconfiguration complete message from the terminal device and / or child IAB node that it serves, and transmits a first uplink message including the RRC reconfiguration complete message to a target IAB-donor-CU via a target path, thereby completing the cross IAB-donor-CU migration or switchover or topology adaptation of the terminal device and / or child IAB node, so that the target IAB-donor-CU can resume the interrupted data transmission with the terminal device and / or child IAB node. In addition, the method imposes fewer restrictions on the signaling processes of switching or migration or topology adaptation of the IAB-MT, IAB-DU of the migration IAB node, and the terminal devices and / or child IAB nodes served by the migration IAB node in the cross IAB-donor-CU IAB node migration or topology adaptation process, thereby ensuring a more flexible cross IAB-donor-CU IAB node migration or topology adaptation process.

[0125] In an embodiment of the present invention, a source IAB donor node may control the interruption of service between a first IAB node and its serving end devices and / or child IAB nodes.

[0126] For example, after the source IAB donor node receives the switching feedback of the target IAB donor node, the source IAB donor node first sends a first downlink message including a first RRC reconfiguration message to the first IAB node, where the first RRC reconfiguration message is from the target IAB donor; then, after receiving the feedback message of the first downlink message from the first IAB node, the source IAB donor node sends a second downlink message including a second RRC reconfiguration message to the source parent IAB node of the first IAB node. After receiving the second downlink message, the source parent IAB node of the first IAB node sends the second RRC reconfiguration message to the first IAB node. After receiving the second RRC reconfiguration message, the first IAB node suspends service with its serving terminal device and / or child IAB node.

[0127] In an embodiment of the present invention, after a first IAB node receives a first downlink message including a first RRC reconfiguration message sent by a source IAB donor node, the first IAB node can send a feedback message of the first downlink message to the source IAB donor node based on an instruction, based on an implementation, based on a timer, or based on a number and / or a ratio.

[0128] For example, when the second condition is satisfied, the first IAB node transmits a feedback message of the first downlink message to the source IAB donor node.

[0129] For example, the second condition may include at least one of the following conditions:

[0130] The first IAB node transmits an RRC reconfiguration message to all terminal devices and / or child IAB nodes served by the first IAB node, or receives an RRC reconfiguration completion message from all terminal devices and / or child IAB nodes served by the first IAB node; The second timer has expired; the number of terminal devices and / or child IAB nodes that have transmitted an RRC reconfiguration message, received feedback of an RRC reconfiguration message, or received an RRC reconfiguration complete message by the first IAB node reaches a third set value, and / or the ratio of terminal devices and / or child IAB nodes that have transmitted an RRC reconfiguration message, received feedback of an RRC reconfiguration message, or received an RRC reconfiguration complete message by the first IAB node reaches a third ratio; and The number of RRC reconfiguration messages sent by the first IAB node to the terminal device and / or child IAB node served by the first IAB node, or the number of feedbacks of RRC reconfiguration messages received for the terminal device and / or child IAB node served by the first IAB node, or the number of RRC reconfiguration completion messages received for the terminal device and / or child IAB node served by the first IAB node, reaches a fourth set value, and / or the ratio of RRC reconfiguration messages sent by the first IAB node to the terminal device and / or child IAB node served by the first IAB node, or the ratio of feedbacks of RRC reconfiguration messages received for the terminal device and / or child IAB node served by the first IAB node, or the ratio of RRC reconfiguration completion messages received for the terminal device and / or child IAB node served by the first IAB node, reaches a fourth ratio.

[0131] Various cases will be described below as examples.

[0132] 1) The first IAB node can suspend operations with the terminal device and / or the child IAB node based on an instruction, for example, based on implementation. For example, when the first IAB node transmits RRC reconfiguration messages for all terminal devices and / or child IAB nodes it serves, or receives RRC reconfiguration completion messages for most terminal devices and / or child IAB nodes, it suspends operations with the terminal device and / or the child IAB node, and initiates a random access procedure to the target parent IAB node by applying new settings stored before in the second RRC reconfiguration message from the source parent IAB node.

[0133] For example, when the first IAB node has sent an RRC reconfiguration message for all terminal devices it serves, or has received an RRC reconfiguration complete message for most of the terminal devices, it suspends operations with all of these terminal devices or with the terminal devices that have received the RRC reconfiguration complete messages.

[0134] Also, for example, when a first IAB node has sent an RRC reconfiguration message for all child IAB nodes it serves, or has received RRC reconfiguration complete messages from a majority of the child IAB nodes, it suspends operations with all of these child IAB nodes or with these child IAB nodes that have received the RRC reconfiguration complete messages.

[0135] Also, for example, when the first IAB node has sent an RRC reconfiguration message for all terminal devices and all child IAB nodes it serves, or when it has received an RRC reconfiguration completion message for most of the terminal devices and child IAB nodes, it suspends operations with all of these terminal devices and child IAB nodes, or suspends operations with these terminal devices and child IAB nodes that have received the RRC reconfiguration completion messages.

[0136] 2) The first IAB node may suspend service with the terminal device and / or the child IAB node based on a timer. For example, when the second timer expires, the first IAB node suspends service with the terminal device and / or the child IAB node that it serves, and initiates a random access procedure with the target parent IAB node by applying the previously stored second RRC reconfiguration message from the source parent IAB node. For example, the first IAB node may start the second timer immediately upon receiving the value of the second timer, or may start the second timer upon receiving the value of the second timer and receiving the second RRC reconfiguration message from the target IAB donor node transmitted by the source parent IAB node.

[0137] For example, when the second timer expires, service with the serving terminal device is discontinued.

[0138] Also, for example, when the second timer expires, the service with the serving child IAB node is discontinued.

[0139] Also, for example, when the second timer expires, service with the serving terminal device and child IAB node is suspended.

[0140] 3) The first IAB node may suspend service with the terminal device and / or child IAB node based on the number and / or ratio of terminal devices and / or child IAB nodes, or the number and / or ratio of messages sent, or the number and / or ratio of messages or feedback received, for example, when the number of terminal devices and / or child IAB nodes that have sent an RRC reconfiguration message or received an RRC reconfiguration message feedback or an RRC reconfiguration complete message by the first IAB node reaches a third set value, and / or when the number of terminal devices and / or child IAB nodes that have sent an RRC reconfiguration message or received an RRC reconfiguration message feedback or an RRC reconfiguration complete message by the first IAB node reaches a third set value. When the ratio of terminal devices and / or child IAB nodes that have received an RRC reconfiguration completion message reaches a third ratio, the first IAB node suspends operations with all of these terminal devices and / or child IAB nodes, or suspends operations with these terminal devices and / or child IAB nodes that have sent an RRC reconfiguration message or received feedback of an RRC reconfiguration message; in other words, the first IAB node suspends operations with the terminal devices and / or child IAB nodes based on the number and / or ratio of terminal devices and / or child IAB nodes that have sent an RRC reconfiguration message, received feedback of an RRC reconfiguration message, or received an RRC reconfiguration completion message.

[0141] Alternatively, the number of RRC reconfiguration messages transmitted by the first IAB node to a terminal device and / or a child IAB node served by the first IAB node, or the number of feedbacks of RRC reconfiguration messages of the terminal device and / or the child IAB node served by the first IAB node received, or the number of RRC reconfiguration completion messages of the terminal device and / or the child IAB node served by the first IAB node received, has reached a fourth setting value, and / or the ratio of the RRC reconfiguration messages transmitted by the first IAB node to the terminal device and / or the child IAB node served by the first IAB node, or the feedbacks of RRC reconfiguration messages of the terminal device and / or the child IAB node served by the first IAB node received, has reached a fourth setting value. When the ratio of feedback of RRC reconfiguration messages sent by the first IAB node to the terminal device and / or child IAB node served by the first IAB node, or the ratio of RRC reconfiguration completion messages received by the first IAB node for the terminal device and / or child IAB node served by the first IAB node, reaches a fourth ratio, the first IAB node suspends operations with the terminal device and / or child IAB node; in other words, the first IAB node suspends operations with the terminal device and / or child IAB node based on the number and / or ratio of feedback of RRC reconfiguration messages sent by the first IAB node to the terminal device and / or child IAB node served by the first IAB node, or the number and / or ratio of RRC reconfiguration completion messages received from the terminal device and / or child IAB node.

[0142] For example, when the number of terminal devices for which the first IAB node has transmitted an RRC reconfiguration message or received an RRC reconfiguration message feedback, or received an RRC reconfiguration completion message reaches a third setting value, and / or the ratio of terminal devices for which the first IAB node has transmitted an RRC reconfiguration message or received an RRC reconfiguration message feedback, or received an RRC reconfiguration completion message reaches a third ratio, the first IAB node suspends service with all of these terminal devices, or suspends service with these terminal devices for which the first IAB node has transmitted an RRC reconfiguration message or received an RRC reconfiguration message feedback, or when the number of RRC reconfiguration messages transmitted or received by the first IAB node to the terminal devices served by the first IAB node reaches a third setting value, When the number of RRC reconfiguration message feedbacks of terminal devices served by the AB node or the number of RRC reconfiguration completion messages received of terminal devices served by the first IAB node reaches a fourth set value, and / or the ratio of RRC reconfiguration messages sent by the first IAB node to terminal devices served by the first IAB node or the ratio of RRC reconfiguration message feedbacks received of terminal devices served by the first IAB node or the ratio of RRC reconfiguration completion messages received of terminal devices served by the first IAB node reaches a fourth ratio, the first IAB node suspends operations with all these terminal devices or suspends operations with the terminal devices that have sent these RRC reconfiguration messages or received these RRC reconfiguration message feedbacks.

[0143] Also, for example, when the number of child IAB nodes from which the first IAB node has transmitted an RRC reconfiguration message or received an RRC reconfiguration message feedback, or received an RRC reconfiguration completion message reaches a third setting value, and / or the ratio of child IAB nodes from which the first IAB node has transmitted an RRC reconfiguration message or received an RRC reconfiguration message feedback, or received an RRC reconfiguration completion message reaches a third ratio, the first IAB node suspends operations with all of these child IAB nodes, or suspends operations with these child IAB nodes from which the first IAB node has transmitted an RRC reconfiguration message or received an RRC reconfiguration message feedback, or when the number of RRC reconfiguration messages transmitted or received by the first IAB node to child IAB nodes served by the first IAB node reaches a third setting value, and / or the ratio of child IAB nodes from which the first IAB node has transmitted an RRC reconfiguration message or received an RRC reconfiguration completion message reaches a third ratio, the first IAB node suspends operations with all of these child IAB nodes, or suspends operations with these child IAB nodes from which the first IAB node has transmitted an RRC reconfiguration message or received an RRC reconfiguration message feedback, or when the number of RRC reconfiguration messages transmitted or received by the first IAB node to child IAB nodes served by the first IAB node reaches a third setting value, When the number of RRC reconfiguration message feedbacks of child IAB nodes served by the first IAB node or the number of RRC reconfiguration complete messages received by the first IAB node for child IAB nodes served by the first IAB node reaches a fourth set value, and / or the ratio of RRC reconfiguration messages sent by the first IAB node to child IAB nodes served by the first IAB node or the ratio of RRC reconfiguration message feedbacks received by the first IAB node or the ratio of RRC reconfiguration complete messages received by the first IAB node for child IAB nodes served by the first IAB node reaches a fourth ratio, the first IAB node suspends operation with all these child IAB nodes or suspends operation with child IAB nodes that have sent these RRC reconfiguration messages or received these RRC reconfiguration message feedbacks. Also, for example, when the number of terminal devices and child IAB nodes from which the first IAB node has transmitted an RRC reconfiguration message, or from which it has received an RRC reconfiguration message feedback, or from which it has received an RRC reconfiguration completion message reaches a third setting value, and / or the ratio of terminal devices and child IAB nodes from which the first IAB node has transmitted an RRC reconfiguration message, or from which it has received an RRC reconfiguration message feedback, or from which it has received an RRC reconfiguration completion message reaches a third ratio, the first IAB node suspends operations with all of these terminal devices and child IAB nodes, or suspends operations with these terminal devices and child IAB nodes from which it has transmitted an RRC reconfiguration message or from which it has received an RRC reconfiguration message feedback, or When the number of feedbacks of RRC reconfiguration messages for terminal devices and child IAB nodes served by the first IAB node, or the number of RRC reconfiguration completion messages received for terminal devices and child IAB nodes served by the first IAB node, reaches a fourth set value, and / or the ratio of RRC reconfiguration messages sent by the first IAB node to terminal devices and child IAB nodes served by the first IAB node, or the ratio of feedbacks of RRC reconfiguration messages received for terminal devices and child IAB nodes served by the first IAB node, or the ratio of RRC reconfiguration completion messages received for terminal devices and child IAB nodes served by the first IAB node, reaches a fourth ratio, the first IAB node suspends operations with all of these terminal devices and child IAB nodes, or suspends operations with the terminal devices and child IAB nodes that have sent RRC reconfiguration messages or received RRC reconfiguration message feedback.

[0144] Also, for example, when the number of terminal devices to which the first IAB node has transmitted an RRC reconfiguration message, or has received feedback of an RRC reconfiguration message, or has received an RRC reconfiguration completion message reaches a third setting value, and / or the ratio of terminal devices to which the first IAB node has transmitted an RRC reconfiguration message, or has received feedback of an RRC reconfiguration message, or has received an RRC reconfiguration completion message reaches a third ratio, the first IAB node suspends operations with all of these terminal devices and child IAB nodes, or suspends operations with these terminal devices and all child IAB nodes to which the first IAB node has transmitted an RRC reconfiguration message or has received feedback of an RRC reconfiguration message, or the number of RRC reconfiguration messages transmitted or received by the first IAB node to terminal devices served by the first IAB node reaches a third setting value, When the number of RRC reconfiguration message feedbacks of the terminal device served by the first IAB node or the number of RRC reconfiguration completion messages received of the terminal device served by the first IAB node reaches a fourth set value, and / or the ratio of RRC reconfiguration messages sent by the first IAB node to the terminal device served by the first IAB node or the ratio of RRC reconfiguration message feedbacks received of the terminal device served by the first IAB node or the ratio of RRC reconfiguration completion messages received of the terminal device served by the first IAB node reaches a fourth ratio, the first IAB node suspends operations with all these terminal devices and child IAB nodes, or suspends operations with these terminal devices and child IAB nodes that have sent RRC reconfiguration messages or received RRC reconfiguration message feedbacks.

[0145] Also, for example, when the number of child IAB nodes at which the first IAB node has transmitted an RRC reconfiguration message or received an RRC reconfiguration message feedback, or received an RRC reconfiguration completion message reaches a third setting value, and / or the ratio of child IAB nodes at which the first IAB node has transmitted an RRC reconfiguration message or received an RRC reconfiguration message feedback, or received an RRC reconfiguration completion message reaches a third ratio, the first IAB node suspends service with all of these terminal devices and child IAB nodes, or suspends service with all of these terminal devices and child IAB nodes at which the first IAB node has transmitted an RRC reconfiguration message or received an RRC reconfiguration message feedback, or when the number of RRC reconfiguration messages transmitted by the first IAB node to the child IAB nodes served by the first IAB node or the number of RRC reconfiguration messages received by the first IAB node reaches a third setting value, When the number of RRC reconfiguration message feedbacks of child IAB nodes served by the first IAB node or the number of RRC reconfiguration completion messages received of child IAB nodes served by the first IAB node reaches a fourth set value, and / or the ratio of RRC reconfiguration messages sent by the first IAB node to child IAB nodes served by the first IAB node or the ratio of RRC reconfiguration message feedbacks received of child IAB nodes served by the first IAB node or the ratio of RRC reconfiguration completion messages received of child IAB nodes served by the first IAB node reaches a fourth ratio, the first IAB node suspends operations with all these terminal devices and child IAB nodes, or suspends operations with all terminal devices and these child IAB nodes that have sent RRC reconfiguration messages or received RRC reconfiguration message feedback.

[0146] In an embodiment of the present invention, the ratio of terminal devices and / or child IAB nodes to which the first IAB node has sent an RRC reconfiguration message, received feedback of an RRC reconfiguration message, or received an RRC reconfiguration completion message refers to the ratio of the number of terminal devices and / or child IAB nodes to which the first IAB node has sent an RRC reconfiguration message, received feedback of an RRC reconfiguration message, or received an RRC reconfiguration completion message, to the total number of terminal devices and / or child IAB nodes served by the first IAB node.

[0147] For example, the ratio of terminal devices to which the first IAB node has sent an RRC reconfiguration message, received feedback of an RRC reconfiguration message, or received an RRC reconfiguration completion message refers to the ratio of the number of terminal devices to which the first IAB node has sent an RRC reconfiguration message, received feedback of an RRC reconfiguration message, or received an RRC reconfiguration completion message, to the total number of terminal device child IAB nodes served by the first IAB node.

[0148] For example, the ratio of child IAB nodes to which the first IAB node has sent an RRC reconfiguration message, received feedback of an RRC reconfiguration message, or received an RRC reconfiguration complete message refers to the ratio of the number of child IAB nodes to which the first IAB node has sent an RRC reconfiguration message, received feedback of an RRC reconfiguration message, or received an RRC reconfiguration complete message, to the total number of child IAB nodes of the first IAB node.

[0149] For example, the ratio of terminal devices and child IAB nodes to which the first IAB node has sent an RRC reconfiguration message, received feedback of an RRC reconfiguration message, or received an RRC reconfiguration completion message refers to the ratio of the number of terminal devices and child IAB nodes to which the first IAB node has sent an RRC reconfiguration message, received feedback of an RRC reconfiguration message, or received an RRC reconfiguration completion message, to the total number of terminal devices and child IAB nodes served by the first IAB node.

[0150] In an embodiment of the present invention, the ratio of the number of RRC reconfiguration messages sent by the first IAB node to the terminal device and / or child IAB node served by the first IAB node, or the feedback of the RRC reconfiguration messages received by the first IAB node to the terminal device and / or child IAB node served by the first IAB node, or the RRC reconfiguration completion messages received by the terminal device and / or child IAB node served by the first IAB node refers to the ratio of the number of RRC reconfiguration messages sent by the first IAB node to the terminal device and / or child IAB node served by the first IAB node, or the feedback of the RRC reconfiguration messages received by the terminal device and / or child IAB node served by the first IAB node, or the RRC reconfiguration completion messages received by the terminal device and / or child IAB node served by the first IAB node to the number of RRC reconfiguration messages sent by the first IAB node.

[0151] For example, in an embodiment of the present invention, the ratio of the number of RRC reconfiguration messages sent by the first IAB node to the terminal device and / or child IAB node served by the first IAB node, or the feedback of the RRC reconfiguration message received by the first IAB node, or the RRC reconfiguration completion message received by the terminal device served by the first IAB node refers to the ratio of the number of RRC reconfiguration messages sent by the first IAB node to the terminal device and / or child IAB node served by the first IAB node, or the feedback of the RRC reconfiguration message received by the terminal device served by the first IAB node, or the RRC reconfiguration completion message received by the terminal device served by the first IAB node to the number of RRC reconfiguration messages sent by the first IAB node.

[0152] For example, in an embodiment of the present invention, the ratio of the number of RRC reconfiguration messages sent by the first IAB node to a child IAB node of the first IAB node, or the feedback of the RRC reconfiguration message received by the child IAB node of the first IAB node, or the RRC reconfiguration completion message received by the child IAB node of the first IAB node refers to the ratio of the number of RRC reconfiguration messages sent by the first IAB node to a child IAB node of the first IAB node, or the feedback of the RRC reconfiguration message received by the child IAB node of the first IAB node, or the RRC reconfiguration completion message received by the child IAB node of the first IAB node, to the number of RRC reconfiguration messages sent by the first IAB node.

[0153] For example, the ratio of the number of RRC reconfiguration messages that the first IAB node sends to the terminal device and child IAB node served by the first IAB node, or the feedback of RRC reconfiguration messages received from the terminal device and child IAB node served by the first IAB node, or the RRC reconfiguration completion messages received from the terminal device and child IAB node served by the first IAB node refers to the ratio of the number of RRC reconfiguration messages that the first IAB node sends to the terminal device and child IAB node served by the first IAB node, or the feedback of RRC reconfiguration messages received from the terminal device and child IAB node served by the first IAB node, or the RRC reconfiguration completion messages received from the terminal device and child IAB node served by the first IAB node, to the number of RRC reconfiguration messages sent by the first IAB node.

[0154] In an embodiment of the present invention, the ratio of the number of RRC reconfiguration messages sent by the first IAB node to the terminal device and / or child IAB node served by the first IAB node, or the feedback of the RRC reconfiguration messages received by the first IAB node to the terminal device and / or child IAB node served by the first IAB node, or the RRC reconfiguration completion messages received by the terminal device and / or child IAB node served by the first IAB node refers to the ratio of the number of RRC reconfiguration messages sent by the first IAB node to the terminal device and / or child IAB node served by the first IAB node, or the feedback of the RRC reconfiguration messages received by the terminal device and / or child IAB node served by the first IAB node, or the RRC reconfiguration completion messages received by the terminal device and / or child IAB node served by the first IAB node to the number of RRC reconfiguration messages sent by the first IAB node.

[0155] For example, in an embodiment of the present invention, the ratio of the number of RRC reconfiguration messages sent by the first IAB node to the terminal device and / or child IAB node served by the first IAB node, or the feedback of the RRC reconfiguration message received by the first IAB node, or the RRC reconfiguration completion message received by the terminal device served by the first IAB node refers to the ratio of the number of RRC reconfiguration messages sent by the first IAB node to the terminal device and / or child IAB node served by the first IAB node, or the feedback of the RRC reconfiguration message received by the terminal device served by the first IAB node, or the RRC reconfiguration completion message received by the terminal device served by the first IAB node to the number of RRC reconfiguration messages sent by the first IAB node.

[0156] For example, in an embodiment of the present invention, the ratio of the number of RRC reconfiguration messages sent by the first IAB node to a child IAB node of the first IAB node, or the feedback of the RRC reconfiguration message received by the child IAB node of the first IAB node, or the RRC reconfiguration completion message received by the child IAB node of the first IAB node refers to the ratio of the number of RRC reconfiguration messages sent by the first IAB node to a child IAB node of the first IAB node, or the feedback of the RRC reconfiguration message received by the child IAB node of the first IAB node, or the RRC reconfiguration completion message received by the child IAB node of the first IAB node, to the number of RRC reconfiguration messages sent by the first IAB node.

[0157] The above describes a case where a migration IAB node controls interruption of service between the terminal device and / or child IAB node served by the source IAB donor node, in which the first IAB node stores the received RRC reconfiguration complete message from the terminal device and / or child IAB node served by the migration IAB node, and transmits a first uplink message including the RRC reconfiguration complete message to a target IAB-donor-CU via a target path, thereby completing the cross IAB-donor-CU migration or switch or topology adaptation of the terminal device and / or child IAB node, so that the target IAB-donor-CU can resume the interrupted data transmission with the terminal device and / or child IAB node. In addition, the method can reduce business interruptions between the first IAB node and the terminal devices it serves and the terminal devices it serves by controlling the execution order of switching, migration or topology adaptation of the IAB-MT, IAB-DU of the first IAB node, and the terminal devices and / or child IAB nodes served by the first IAB node in a cross IAB-donor-CU IAB node migration or topology adaptation process.

[0158] In an embodiment of the present invention, before step 801, as shown in FIG. 8, for example, the method further includes the following steps.

[0159] Step 805: Receive a first downlink message from a source IAB donor node.

[0160] The first downlink message includes a first RRC reconfiguration message, and the first RRC reconfiguration message includes a key configured by the target IAB donor node. For example, after the source IAB donor node receives the switching feedback of the target IAB donor node, the source IAB donor node first sends a first downlink message including a first RRC reconfiguration message to the first IAB node.

[0161] In an embodiment of the present invention, for example, the first downlink message is a second F1 message.

[0162] For example, the first downlink message includes at least one of the following: Second instruction information, the second instruction information being used to instruct to perform migration of a cross-CU IAB node or to instruct a terminal device setting to be performed for migration of the cross-CU IAB node, for example, the second instruction information being an "instruction" based on which the first IAB node suspends service with the terminal device and / or the child IAB node under the above-mentioned first and second conditions; a value of a first timer or a second timer, the first timer or the second timer being used for at least one of: the first IAB node initiating a random access procedure with a target parent IAB node, a distributed unit of the first IAB node establishing an F1 interface with a central unit of the target IAB donor node, and the first IAB node sending a feedback of a first RRC reconfiguration message to the source IAB donor node; and The number and / or ratio of at least one of terminal devices, child IAB nodes, messages, and feedback.

[0163] In an embodiment of the present invention, the feedback of the first RRC reconfiguration message is, for example, a UE context modification response message or an uplink RRC message transmission message.

[0164] In an embodiment of the present invention, the number and / or ratio of at least one of the terminal devices, child IAB nodes, messages, and feedback may refer to the specific contents of the above first and second conditions.

[0165] For example, the number of terminal devices refers to the first setting value or the second setting value described above, and the ratio of terminal devices refers to the first ratio or the second ratio described above, or the number of terminal devices refers to the third setting value or the fourth setting value described above, and the ratio of terminal devices refers to the third ratio or the fourth ratio described above.

[0166] In an embodiment of the present invention, the specific values ​​of the first set value, the second set value, the third set value, the fourth set value and the first ratio, the second ratio, the third ratio, and the fourth ratio can be set based on actual conditions.

[0167] For example, a single configuration value may be used for the terminal device and child IAB nodes served by the first IAB node; or Using two configuration values ​​for the terminal device and child IAB node served by the first IAB node, for example, one configuration value is used for the terminal device and one configuration value is used for the child IAB node; or using one ratio for the terminal devices and child IAB nodes served by the first IAB node; or Using two ratios for the terminal device and child IAB nodes served by the first IAB node, e.g., one ratio is used for the terminal device and one ratio is used for the child IAB node; or For the terminal device and child IAB node served by the first IAB node, one setting value and one ratio are used, for example, one setting value is used for the terminal device and one ratio is used for the child IAB node, or one ratio is used for the terminal device and one setting value is used for the child IAB node.

[0168] Alternatively, the first IAB node may use one value of the timer for the terminal device and child IAB nodes that it serves; or For the terminal device and child IAB nodes served by the first IAB node, two values ​​of the timer may be used, one value used for the terminal device and one value used for the child IAB node.

[0169] In step 803, the source IAB donor node sends the RRC reconfiguration complete message to the target IAB donor node. Figure 10 is a diagram showing a method of implementing step 803 in embodiment 1 of the present invention. As shown in Figure 10, the method includes the following steps:

[0170] Step 1001: The first IAB node sends a second uplink message including the RRC reconfiguration complete message to a source IAB donor node; and Step 1002: The source IAB donor node sends the RRC reconfiguration complete message to the target IAB donor node.

[0171] In this way, the first IAB node sends an RRC reconfiguration completion message included in the second uplink message to the target IAB-donor-CU via the source IAB-donor-CU, completing the cross IAB-donor-CU migration or switch or topology adaptation of the terminal device, so that the target IAB-donor-CU can resume the interrupted data transmission with the terminal device. In addition, the method has less impact on the current IAB node, and can apply the new function, i.e., cross IAB-donor-CU IAB node migration or switch or topology adaptation, more quickly, so that the whole system can better perform load balancing between IAB-donor-CUs, etc.

[0172] In step 1002, the source IAB donor node may send an Xn message or an NG message including the RRC reconfiguration complete message to the target IAB donor node via an Xn interface or an NG interface.

[0173] In an embodiment of the present invention, the second uplink message may include third indication information, and the third indication information is used to instruct the source IAB donor node to send the RRC reconfiguration complete message to the target IAB donor node.

[0174] For example, the second uplink message is a third F1 message.

[0175] For example, the third F1 message is at least one of a terminal device context establishment response message or a terminal device context modification response message.

[0176] For example, the RRC reconfiguration completion message of the terminal device corresponding to the terminal device context establishment response message or the terminal device context modification response message is included in the terminal device context establishment response message or the terminal device context modification response message, or the terminal device context establishment response message or the terminal device context modification response message includes at least one of the RRC reconfiguration completion messages, and for one of the at least one RRC reconfiguration completion messages, the terminal device transmitting this RRC reconfiguration completion message is the same as or different from the terminal associated with the terminal device context establishment response message or the terminal device context modification response message. For example, the terminal device context establishment response message or the terminal device context modification response message includes two RRC reconfiguration completion messages, of which one RRC reconfiguration completion message is from the terminal corresponding to the terminal device context establishment response message or the terminal device context modification response message, and the other RRC reconfiguration completion message is from one terminal different from the terminal corresponding to the terminal device context establishment response message or the terminal device context modification response message.

[0177] Also, for example, the third F1 message is an uplink RRC message transfer message.

[0178] For example, all RRC reconfiguration completion messages are included in one uplink RRC message transmission message, or the RRC reconfiguration completion messages sent by all terminal devices are included in one uplink RRC message transmission message and the RRC reconfiguration completion messages sent by all IAB child nodes are included in one different uplink RRC message transmission message, or the RRC reconfiguration completion messages sent by terminal devices or IAB child nodes served by one IAB node are included in one uplink RRC message transmission message and the RRC reconfiguration completion messages sent by terminal devices or IAB child nodes served by another IAB node are included in one different uplink RRC message transmission message, or the RRC reconfiguration completion messages sent by terminal devices served by one IAB node are included in one uplink RRC message transmission message, and the RRC reconfiguration completion messages sent by IAB child nodes served by this IAB node are included in one different uplink RRC message transmission message.

[0179] In an embodiment of the present invention, the terminal devices and / or child IAB nodes served by the first IAB node may all adopt step 802, all may adopt step 803, or some may adopt step 802 and some may adopt step 803.

[0180] For example, the RRC reconfiguration completion message includes a first RRC reconfiguration completion message and a second RRC reconfiguration completion message, the first RRC reconfiguration completion message is an RRC reconfiguration completion message generated by a first terminal device and / or a first child IAB node served by the first IAB node, the second RRC reconfiguration completion message is an RRC reconfiguration completion message generated by a second terminal device and / or a second child IAB node served by the first IAB node, the first IAB node sends a first uplink message including the first RRC reconfiguration completion message to a target IAB donor node via a target route, and the first IAB node sends a second uplink message including the second RRC reconfiguration completion message to a source IAB donor node, and the source IAB donor node sends the second RRC reconfiguration completion message to the target IAB donor node.

[0181] In an embodiment of the present invention, all of the terminal devices served by child IAB nodes served by the first IAB node may perform processing by adopting step 802 or step 803, or some may adopt step 802 and some may adopt step 803.

[0182] As can be seen from the above embodiments, by sending a first uplink message including an RRC reconfiguration completion message to the target IAB donor node via the target route, or by sending an RRC reconfiguration completion message to the target IAB donor node via the source IAB donor node, the target IAB donor node can obtain the RRC reconfiguration completion message of the terminal device and / or child IAB node served by the migration IAB node, and can know whether the terminal device and / or child IAB node have completed route switching, thereby resuming data transmission with the terminal device and / or child IAB node that was interrupted to perform the IAB-donor-CU migration or topology adaptation process of the migration IAB node. EXAMPLES

[0183] In an embodiment of the present invention, a migration method for an IAB node is provided, the method is applied to a first IAB donor node, and the first IAB donor node is a source IAB donor node of the first IAB node. The method corresponds to the first embodiment, and reference can be made to the description in the first embodiment for the same content.

[0184] 11 is a diagram illustrating a migration method for an IAB node according to embodiment 2 of the present invention. As shown in FIG. 11, the method includes the following steps:

[0185] Step 1101: Receive a second uplink message from a first IAB node, the second uplink message including an RRC reconfiguration complete message of a terminal device and / or a child IAB node served by the first IAB node; and Step 1102: Send the RRC reconfiguration complete message to the target IAB donor node of the first IAB node.

[0186] In step 1102, the source IAB donor node may send an Xn message or an NG message including the RRC reconfiguration complete message to the target IAB donor node via the Xn interface or the NG interface.

[0187] In an embodiment of the present invention, the second uplink message may include third indication information, and the third indication information is used to instruct the source IAB donor node to send the RRC reconfiguration complete message to the target IAB donor node.

[0188] For example, the second uplink message is a third F1 message.

[0189] For example, the third F1 message is at least one of a terminal device context establishment response message and a terminal device context modification response message, or the third F1 message is an uplink RRC message transmission message.

[0190] For example, the RRC reconfiguration completion message of the terminal device corresponding to the terminal device context establishment response message or the terminal device context modification response message is included in the terminal device context establishment response message or the terminal device context modification response message, or the terminal device context establishment response message or the terminal device context modification response message includes at least one of the RRC reconfiguration completion messages, and for one of the at least one RRC reconfiguration completion messages, the terminal device transmitting this RRC reconfiguration completion message is the same as or different from the terminal associated with the terminal device context establishment response message or the terminal device context modification response message.

[0191] For example, all RRC reconfiguration completion messages are included in one uplink RRC message transmission message, or the RRC reconfiguration completion messages sent by all terminal devices are included in one uplink RRC message transmission message and the RRC reconfiguration completion messages sent by all IAB child nodes are included in one different uplink RRC message transmission message, or the RRC reconfiguration completion messages sent by terminal devices or IAB child nodes served by one IAB node are included in one uplink RRC message transmission message and the RRC reconfiguration completion messages sent by terminal devices or IAB child nodes served by another IAB node are included in one different uplink RRC message transmission message, or the RRC reconfiguration completion messages sent by terminal devices served by one IAB node are included in one uplink RRC message transmission message and the RRC reconfiguration completion messages sent by IAB child nodes served by this IAB node are included in one different uplink RRC message transmission message.

[0192] In an embodiment of the present invention, as shown in FIG. 11, for example, the method further includes the following steps.

[0193] Step 1103: Send a first downlink message to the first IAB node, where the first downlink message includes a first RRC reconfiguration message; and Step 1104: Send a second downlink message to a source parent IAB node of the first IAB node, where the second downlink message includes a second RRC reconfiguration message.

[0194] In the embodiment of the present invention, the order of execution of steps 1103 and 1104 is not limited.

[0195] In an embodiment of the present invention, the second uplink message is also designated as a feedback message of the first downlink message, or the method further includes the following step, namely, receiving a feedback message of the first downlink message.

[0196] 12 is another diagram illustrating a migration method for an IAB node according to embodiment 2 of the present invention. As shown in FIG. 12, the method includes the following steps:

[0197] Step 1201: receiving a feedback message of a first downlink message including a first RRC reconfiguration message from the first IAB node; and Step 1202: Send a second downlink message to a source parent IAB node of the first IAB node, where the second downlink message includes a second RRC reconfiguration message.

[0198] In an embodiment of the present invention, when the first IAB donor node receives feedback of the first RRC reconfiguration message from the first IAB node, it sends a second downlink message to a source parent IAB node of the first IAB node, and the second downlink message includes a second RRC reconfiguration message.

[0199] In an embodiment of the present invention, as shown in FIG. 12, for example, the method further includes the following steps.

[0200] Step 1203: Send the first downlink message to the first IAB node, where the first downlink message includes the first RRC reconfiguration message.

[0201] In an embodiment of the present invention, the first RRC reconfiguration message includes a key configured by a target IAB donor node of the first IAB node.

[0202] For example, the first downlink message is a second F1 message.

[0203] For example, the first downlink message includes at least one of the following: Second instruction information, the second instruction information being used to instruct to perform migration of a cross-CU IAB node or to instruct a terminal device setting to be performed for migration of the cross-CU IAB node, for example, the second instruction information being an "instruction" based on which the first IAB node suspends service with the terminal device and / or the child IAB node under the above-mentioned first and second conditions; a value of a first timer or a second timer, the first timer or the second timer being used for at least one of: the first IAB node initiating a random access procedure with a target parent IAB node, a distributed unit of the first IAB node establishing an F1 interface with a central unit of the target IAB donor node, and the first IAB node sending a feedback of a first RRC reconfiguration message to the source IAB donor node; and The number and / or ratio of at least one of terminal devices, child IAB nodes, messages, and feedback.

[0204] As can be seen from the above embodiments, by sending a first uplink message including an RRC reconfiguration completion message to the target IAB donor node via the target route, or by sending an RRC reconfiguration completion message to the target IAB donor node via the source IAB donor node, the target IAB donor node can obtain the RRC reconfiguration completion message of the terminal device and / or child IAB node served by the migration IAB node, and can know whether the terminal device and / or child IAB node have completed route switching, thereby resuming data transmission with the terminal device and / or child IAB node that was interrupted to perform the IAB-donor-CU migration or topology adaptation process of the migration IAB node. EXAMPLES

[0205] In an embodiment of the present invention, a migration method for an IAB node is provided, the method is applied to a second IAB donor node, and the second IAB donor node is a target IAB donor node of a first IAB node. The method corresponds to the first embodiment, and the same content can be referred to in the description of the first embodiment.

[0206] 13 is a diagram illustrating a migration method for an IAB node according to the third embodiment of the present invention. As shown in FIG. 13, the method includes at least one of the following steps:

[0207] Step 1301: receiving a first uplink message, including an RRC reconfiguration complete message, sent by the first IAB node via a target route; and / or Step 1302: Receive an Xn message or an NG message including an RRC reconfiguration complete message from the source IAB donor node.

[0208] The RRC reconfiguration complete message is an RRC reconfiguration complete message of a terminal device and / or a child IAB node served by the first IAB node.

[0209] In an embodiment of the present invention, for terminal devices and / or child IAB nodes served by a first IAB node, if step 802 is adopted for all in embodiment 1, then step 1301 is also adopted for all in embodiment 3, and if step 803 is adopted for all in embodiment 1, then step 1302 is also adopted for all in embodiment 3, and when some in embodiment 1 adopt step 802 and some adopt step 803, then some in embodiment 3 adopt step 1301 and some adopt step 1302.

[0210] In an embodiment of the present invention, the target path is an F1 interface between a distributed unit of the first IAB node and a central unit of the target IAB donor node.

[0211] In an embodiment of the present invention, the RRC reconfiguration complete message from the source IAB donor node is sent via the Xn interface or the NG interface.

[0212] As can be seen from the above embodiments, by sending a first uplink message including an RRC reconfiguration completion message to the target IAB donor node via the target route, or by sending an RRC reconfiguration completion message to the target IAB donor node via the source IAB donor node, the target IAB donor node can obtain the RRC reconfiguration completion message of the terminal device and / or child IAB node served by the migration IAB node, and can know whether the terminal device and / or child IAB node have completed route switching, thereby resuming data transmission with the terminal device and / or child IAB node that was interrupted to perform the IAB-donor-CU migration or topology adaptation process of the migration IAB node. EXAMPLES

[0213] In an embodiment of the present invention, a migration method for an IAB node is provided, the method is applied to a first IAB node, a first IAB donor node and a second IAB donor node, the first IAB donor node is a source IAB donor node of the first IAB node, and the second IAB donor node is a destination IAB donor node of the first IAB node. The method corresponds to the first to third embodiments, and the same contents can be referred to in the descriptions in the first to third embodiments.

[0214] In an embodiment of the present invention, the second IAB node is a source parent IAB node of the first IAB node, and the third IAB node is a destination parent IAB node of the first IAB node.

[0215] Fig. 14 is a diagram showing a migration method of an IAB node according to a fourth embodiment of the present invention. In Fig. 14, an example is described in which a first IAB node serves a first terminal device, but the first IAB node may further serve other terminal devices, and the first IAB node may further serve at least one child IAB node.

[0216] As shown in FIG. 14, the method includes the following steps:

[0217] Step 1401: a first IAB donor node sends a first downlink message including a first RRC reconfiguration message to a first IAB node; Step 1402: the first IAB node sends a feedback message of a first downlink message to the first IAB donor node; Step 1403: the first IAB node sends a first RRC reconfiguration message to the first terminal device; Step 1404: the first terminal device sends an RRC reconfiguration complete message to the first IAB node; Step 1405: The first IAB node controls interruption of service with the first terminal device based on the mechanism of the timer or counter; Step 1406: The first IAB donor node sends a second downlink message to the second IAB node, the second downlink message including a second RRC reconfiguration message; Step 1407: the second IAB node sends a second RRC reconfiguration message to the first IAB node; Step 1408: The first IAB node initiates a random access procedure to the third IAB node based on the second RRC reconfiguration message; and Step 1409: The first IAB node sends a first uplink message including the RRC reconfiguration complete message to the second IAB donor node via the F1 interface.

[0218] In this way, the method imposes fewer restrictions on the signaling processes of switching or migration or topology adaptation of the IAB-MT, IAB-DU of the migration IAB node, and the terminal devices and / or child IAB nodes served by the migration IAB node in the cross IAB-donor-CU IAB node migration or topology adaptation process, thereby ensuring a more flexible cross IAB-donor-CU IAB node migration or topology adaptation process.

[0219] In the embodiment of the present invention, the order of execution between step 1401 and step 1406, and between step 1405 and step 1407 is not limited.

[0220] In an embodiment of the present invention, step 1401 precedes step 1402, step 1401 precedes step 1403, step 1403 precedes step 1404, step 1405 precedes step 1408, step 1408 precedes step 1409, and there is no restriction on the order of execution of the other steps.

[0221] In other words, there is no restriction on the order of the first downlink message and the second downlink message, and after receiving the first downlink message, the first IAB node applies the realization or timer or counter-based mechanism, and there is no restriction on the order of the execution of the realization or timer or counter-based mechanism and the reception of the second RRC reconfiguration message from the second IAB node.

[0222] As can be seen from the above embodiment, the first IAB node stores the received RRC reconfiguration complete message from its serving terminal device and / or child IAB node, and transmits a first uplink message including the RRC reconfiguration complete message to the target IAB-donor-CU via the target path, thereby completing the migration or switching or topology adaptation of the cross IAB-donor-CU of the terminal device and / or child IAB node, so that the target IAB-donor-CU can resume the interrupted data transmission with the terminal device and / or child IAB node. In addition, the method imposes less restrictions on the signaling process of the IAB-MT, IAB-DU of the migration IAB node, and the switching or migration or topology adaptation of the terminal device and / or child IAB node served by the migration IAB node in the IAB node migration or topology adaptation process of the cross IAB-donor-CU, thereby ensuring a more flexible IAB node migration or topology adaptation process of the cross IAB-donor-CU. EXAMPLES

[0223] In an embodiment of the present invention, a migration method for an IAB node is provided, the method is applied to a first IAB node, a first IAB donor node and a second IAB donor node, the first IAB donor node is a source IAB donor node of the first IAB node, and the second IAB donor node is a destination IAB donor node of the first IAB node. The method corresponds to the first to third embodiments, and the same contents can be referred to in the descriptions in the first to third embodiments.

[0224] In an embodiment of the present invention, the second IAB node is a source parent IAB node of the first IAB node, and the third IAB node is a destination parent IAB node of the first IAB node.

[0225] Fig. 15 is a diagram showing a migration method of an IAB node according to a fifth embodiment of the present invention. In Fig. 15, an example is described in which a first IAB node serves a first terminal device, but the first IAB node may further serve other terminal devices, and the first IAB node may further serve at least one child IAB node.

[0226] As shown in FIG. 15, the method includes the following steps:

[0227] Step 1501: a first IAB donor node sends a first downlink message including a first RRC reconfiguration message to a first IAB node; Step 1502: the first IAB node sends a first RRC reconfiguration message to the first terminal device; Step 1503: the first terminal device sends an RRC reconfiguration complete message to the first IAB node; Step 1504: Controlling the first IAB node to send a feedback message of the first downlink message to the first IAB donor node based on the implementation or timer or counter mechanism; Step 1505: The first IAB node sends a feedback message of the first downlink message to the first IAB donor node; Step 1506: The first IAB donor node sends a second downlink message including a second RRC reconfiguration message to the second IAB node; Step 1507: the second IAB node sends a second RRC reconfiguration message to the first IAB node; Step 1508: The first IAB node initiates a random access procedure to the third IAB node based on the second RRC reconfiguration message; and Step 1509: The first IAB node sends a first uplink message including the RRC reconfiguration complete message to the second IAB donor node via the F1 interface.

[0228] In this way, the method can reduce business interruptions between the first IAB node and the terminal devices it serves and the terminal devices it serves by controlling the execution order of switching or migration or topology adaptation of the IAB-MT, IAB-DU of the first IAB node, and the terminal devices served by the first IAB node and / or the child IAB nodes in a cross IAB-donor-CU IAB node migration or topology adaptation process.

[0229] In the embodiment of the present invention, step 1506 is executed after step 1505 is executed.

[0230] As can be seen from the above embodiment, the first IAB node stores the received RRC reconfiguration completion message from the terminal device and / or child IAB node served by the first IAB node, and transmits a first uplink message including the RRC reconfiguration completion message to the target IAB-donor-CU via a target path, thereby completing the migration or switching or topology adaptation of the cross IAB-donor-CU of the terminal device and / or child IAB node, so that the target IAB-donor-CU can resume the interrupted data transmission with the terminal device and / or child IAB node. In addition, the method controls the execution order of the IAB-MT, IAB-DU of the first IAB node, and the switching or migration or topology adaptation of the terminal device and / or child IAB node served by the first IAB node in the IAB node migration or topology adaptation process of the cross IAB-donor-CU, thereby reducing the service interruption between the first IAB node and the terminal device served by the first IAB node and the terminal device served by the child IAB node. EXAMPLES

[0231] In an embodiment of the present invention, a migration method for an IAB node is provided, the method is applied to a first IAB node, a first IAB donor node and a second IAB donor node, the first IAB donor node is a source IAB donor node of the first IAB node, and the second IAB donor node is a destination IAB donor node of the first IAB node. The method corresponds to the first to third embodiments, and the same contents can be referred to in the descriptions in the first to third embodiments.

[0232] In an embodiment of the present invention, the second IAB node is a source parent IAB node of the first IAB node, and the third IAB node is a destination parent IAB node of the first IAB node.

[0233] Fig. 16 is a diagram showing a migration method of an IAB node according to a sixth embodiment of the present invention. In Fig. 16, an example is described in which a first IAB node serves a first terminal device, but the first IAB node may further serve other terminal devices, and the first IAB node may further serve at least one child IAB node.

[0234] As shown in FIG. 16, the method includes the following steps:

[0235] Step 1601: a first IAB donor node sends a first downlink message including a first RRC reconfiguration message to a first IAB node; Step 1602: the first IAB node sends a feedback message of a first downlink message to the first IAB donor node; Step 1603: the first IAB node sends a first RRC reconfiguration message to the first terminal device; Step 1604: the first terminal device sends an RRC reconfiguration complete message to the first IAB node; Step 1605: The first IAB node sends a second uplink message including the RRC reconfiguration complete message to the first IAB donor node via the F1 interface; and Step 1606: The first IAB donor node sends an Xn message including the RRC reconfiguration complete message to the second IAB donor node via the Xn interface.

[0236] In this way, the first IAB node sends an RRC reconfiguration completion message included in the second uplink message to the target IAB-donor-CU via the source IAB-donor-CU, completing the cross IAB-donor-CU migration or switch or topology adaptation of the terminal device, so that the target IAB-donor-CU can resume the interrupted data transmission with the terminal device. In addition, the method has less impact on the current IAB node, and can apply the new function, i.e., cross IAB-donor-CU IAB node migration or switch or topology adaptation, more quickly, so that the whole system can better perform load balancing between IAB-donor-CUs, etc.

[0237] In an embodiment of the present invention, step 1602 may be performed after step 1601, i.e., after the first IAB node receives the first downlink message including the first RRC reconfiguration message, the first IAB node immediately sends a feedback message of the first downlink message to the first IAB donor node. Alternatively, in step 1605, the second uplink message is also taken as a feedback message of the first downlink message, and step 1602 may not be performed.

[0238] As can be seen from the above embodiment, the first IAB node sends an RRC reconfiguration completion message included in the second uplink message to the target IAB-donor-CU via the source IAB-donor-CU, completing the cross IAB-donor-CU migration or switch or topology adaptation of the terminal device, so that the target IAB-donor-CU can resume the interrupted data transmission with the terminal device. In addition, the method has less impact on the current IAB node and can apply the new function, i.e., cross IAB-donor-CU IAB node migration or switch or topology adaptation, more quickly, so that the entire system can better perform load balancing between IAB-donor-CUs, etc. EXAMPLES

[0239] In an embodiment of the present invention, a migration device for an IAB node is provided, and the device is applied to a first IAB node. The principle of the problem solved by the device is similar to that of the method in the first embodiment, so the specific implementation can refer to the implementation of the method in the first embodiment, and the duplicated description of the same content will be omitted here.

[0240] FIG. 17 is a diagram showing a migration device of an IAB node of the seventh embodiment of the present invention. As shown in FIG. 17, the device 1700 includes the following units:

[0241] A first receiving unit 1701: receives an RRC reconfiguration completion message of a terminal device and / or a child IAB node served by the first IAB node; and A first sending unit 1702: sends a first uplink message including the RRC reconfiguration complete message to a target IAB donor node via a target route, or sends the RRC reconfiguration complete message to a target IAB donor node via a source IAB donor node.

[0242] FIG. 18 is a diagram illustrating a first transmitting unit of the seventh embodiment of the present invention. As shown in FIG. 18, the first transmitting unit 1702 includes the following units:

[0243] A first storage unit 1801: for storing the RRC reconfiguration completion message; A first establishment unit 1802: establishes the target path; and A second sending unit 1803: sends the first uplink message to a target IAB donor node via the target route.

[0244] As shown in FIG. 18, the first sending unit 1702 may further include the following units:

[0245] A first suspending unit 1804: suspends service with the terminal device and / or the child IAB node when a first condition is satisfied.

[0246] For example, the first condition includes at least one of the following conditions:

[0247] The first IAB node transmits an RRC reconfiguration message to all terminal devices and / or child IAB nodes served by the first IAB node, or receives an RRC reconfiguration completion message from all terminal devices and / or child IAB nodes served by the first IAB node; The first timer has expired; the number of terminal devices and / or child IAB nodes that have transmitted an RRC reconfiguration message, received feedback of an RRC reconfiguration message, or received an RRC reconfiguration complete message by the first IAB node reaches a first set value, and / or the ratio of terminal devices and / or child IAB nodes that have transmitted an RRC reconfiguration message, received feedback of an RRC reconfiguration message, or received an RRC reconfiguration complete message by the first IAB node reaches a first ratio; and The number of RRC reconfiguration messages sent by the first IAB node to the terminal device and / or child IAB node served by the first IAB node, or the number of feedbacks of RRC reconfiguration messages received for the terminal device and / or child IAB node served by the first IAB node, or the number of RRC reconfiguration completion messages received for the terminal device and / or child IAB node served by the first IAB node, reaches a second set value, and / or the ratio of RRC reconfiguration messages sent by the first IAB node to the terminal device and / or child IAB node served by the first IAB node, or the ratio of feedbacks of RRC reconfiguration messages received for the terminal device and / or child IAB node served by the first IAB node, or the ratio of RRC reconfiguration completion messages received for the terminal device and / or child IAB node served by the first IAB node reaches a second ratio.

[0248] As shown in FIG. 18, the first sending unit 1702 may further include the following units:

[0249] A third sending unit 1805: sends a feedback message of the first downlink message to the source IAB donor node when a second condition is satisfied.

[0250] For example, the second condition includes at least one of the following conditions:

[0251] The first IAB node transmits an RRC reconfiguration message to all terminal devices and / or child IAB nodes served by the first IAB node, or receives an RRC reconfiguration completion message from all terminal devices and / or child IAB nodes served by the first IAB node; The second timer has expired; the number of terminal devices and / or child IAB nodes that have transmitted an RRC reconfiguration message, received feedback of an RRC reconfiguration message, or received an RRC reconfiguration complete message by the first IAB node reaches a third set value, and / or the ratio of terminal devices and / or child IAB nodes that have transmitted an RRC reconfiguration message, received feedback of an RRC reconfiguration message, or received an RRC reconfiguration complete message by the first IAB node reaches a third ratio; and The number of RRC reconfiguration messages sent by the first IAB node to the terminal device and / or child IAB node served by the first IAB node, or the number of feedbacks of RRC reconfiguration messages received for the terminal device and / or child IAB node served by the first IAB node, or the number of RRC reconfiguration completion messages received for the terminal device and / or child IAB node served by the first IAB node, reaches a fourth set value, and / or the ratio of RRC reconfiguration messages sent by the first IAB node to the terminal device and / or child IAB node served by the first IAB node, or the ratio of feedbacks of RRC reconfiguration messages received for the terminal device and / or child IAB node served by the first IAB node, or the ratio of RRC reconfiguration completion messages received for the terminal device and / or child IAB node served by the first IAB node, reaches a fourth ratio.

[0252] For example, as shown in FIG. 17, the apparatus 1700 further includes the following units:

[0253] A second receiving unit 1703: receives the first instruction information.

[0254] The first instruction information is used to indicate that the RRC reconfiguration complete message is an RRC reconfiguration complete message protected by security settings configured by the target IAB donor node, or to indicate that the RRC reconfiguration complete message is to be sent to the target IAB donor node, or to indicate that the first IAB node stores the RRC reconfiguration complete message.

[0255] For example, the first indication information is included in an RLC unit header or a MAC unit header.

[0256] For example, as shown in FIG. 17, the apparatus 1700 further includes the following units:

[0257] Second storage unit 1704: Used by the MAC layer or the RLC layer or the BAP layer of the distributed unit of the first IAB node to store the RRC reconfiguration complete message.

[0258] For example, the first memory unit 1801 includes the second memory unit 1704 .

[0259] For example, the device further includes a first transmission unit, which is used by the MAC layer of the distributed unit of the first IAB node to transmit the first indication information to the RLC layer, or further includes a third storage unit, which is used by the BAP layer of the IAB-MT to store the RRC reconfiguration complete message when the first IAB node IAB-DU receives the first indication information, or further includes a fourth storage unit, which is used by the BAP layer of the IAB-DU to store the RRC reconfiguration complete message if the first indication information is from a child IAB node serving the first IAB node, or further includes a second transmission unit, which is used by the MAC layer or RLC layer of the IAB-DU of the first IAB node to send the first indication information to the BAP layer.

[0260] For the specific contents of storing the RRC reconfiguration completion message, refer to the description in the first embodiment, and the detailed description thereof will be omitted here.

[0261] For example, as shown in FIG. 18, the first sending unit 1702 further includes the following units:

[0262] A third receiving unit 1806: receives a second RRC reconfiguration message from a source parent IAB node; A random access unit 1807: initiating a random access procedure to a target parent node of the first IAB node based on the second RRC reconfiguration message; and First switching unit 1808: Switches to the target route.

[0263] In an embodiment of the present invention, the target path is an F1 interface between a distributed unit (DU) of the first IAB node and a central unit (CU) of the target IAB donor node.

[0264] For example, the first uplink message is a first F1 message.

[0265] For example, the first F1 message is at least one of a terminal device context establishment response message and a terminal device context modification response message.

[0266] For example, the RRC reconfiguration completion message of the terminal device corresponding to the terminal device context establishment response message or the terminal device context modification response message is included in the terminal device context establishment response message or the terminal device context modification response message, or the terminal device context establishment response message or the terminal device context modification response message includes at least one of the RRC reconfiguration completion messages, and for one of the at least one RRC reconfiguration completion messages, the terminal device transmitting this RRC reconfiguration completion message is the same as or different from the terminal device associated with the terminal device context establishment response message or the terminal device context modification response message.

[0267] For example, the first F1 message is an uplink RRC message transfer message.

[0268] For example, all RRC reconfiguration completion messages are included in one uplink RRC message transmission message, or the RRC reconfiguration completion messages sent by all terminal devices are included in one uplink RRC message transmission message and the RRC reconfiguration completion messages sent by all IAB child nodes are included in one different uplink RRC message transmission message, or the RRC reconfiguration completion messages sent by terminal devices or IAB child nodes served by one IAB node are included in one uplink RRC message transmission message and the RRC reconfiguration completion messages sent by terminal devices or IAB child nodes served by another IAB node are included in one different uplink RRC message transmission message, or the RRC reconfiguration completion messages sent by terminal devices served by one IAB node are included in one uplink RRC message transmission message and the RRC reconfiguration completion messages sent by IAB child nodes served by this IAB node are included in one different uplink RRC message transmission message.

[0269] For example, as shown in FIG. 17, the apparatus 1700 further includes the following units:

[0270] A fourth receiving unit 1705: receives a first downlink message from a source IAB donor node.

[0271] The first downlink message includes a first RRC reconfiguration message, and the first RRC reconfiguration message includes a key configured by the target IAB donor node.

[0272] For example, the first downlink message is a second F1 message.

[0273] For example, the first downlink message includes at least one of the following: second instruction information, the second instruction information being used for instructing to perform migration of an IAB node of a cross CU or instructing a terminal device setting to be performed for migration of an IAB node of a cross CU; a value of a first timer or a second timer, the first timer or the second timer being used for at least one of: the first IAB node initiating a random access procedure with a target parent IAB node, a distributed unit of the first IAB node establishing an F1 interface with a central unit of the target IAB donor node, and the first IAB node sending a feedback of a first RRC reconfiguration message to the source IAB donor node; and The number and / or ratio of at least one of terminal devices, child IAB nodes, messages, and feedback.

[0274] For example, as shown in FIG. 18, the first sending unit 1702 further includes the following units:

[0275] A fourth sending unit 1809: sends a second uplink message including the RRC reconfiguration complete message to the source IAB donor node, and the RRC reconfiguration complete message is sent by the source IAB donor node to the target IAB donor node.

[0276] For example, the RRC reconfiguration complete message is sent by the source IAB donor node to the target IAB donor node via an Xn interface or an NG interface.

[0277] For example, the second uplink message includes third indication information, and the third indication information is used to instruct the source IAB donor node to send the RRC reconfiguration complete message to the target IAB donor node.

[0278] For example, the second uplink message is a third F1 message.

[0279] For example, the third F1 message is at least one of a terminal device context establishment response message or a terminal device context modification response message.

[0280] For example, the RRC reconfiguration completion message of the terminal device corresponding to the terminal device context establishment response message or the terminal device context modification response message is included in the terminal device context establishment response message or the terminal device context modification response message, or the terminal device context establishment response message or the terminal device context modification response message includes at least one of the RRC reconfiguration completion messages, and for one of the at least one RRC reconfiguration completion messages, the terminal device transmitting this RRC reconfiguration completion message is the same as or different from the terminal associated with the terminal device context establishment response message or the terminal device context modification response message.

[0281] For example, the third F1 message is an uplink RRC message transfer message.

[0282] For example, all RRC reconfiguration completion messages are included in one uplink RRC message transmission message, or the RRC reconfiguration completion messages sent by all terminal devices are included in one uplink RRC message transmission message and the RRC reconfiguration completion messages sent by all IAB child nodes are included in one different uplink RRC message transmission message, or the RRC reconfiguration completion messages sent by terminal devices or IAB child nodes served by one IAB node are included in one uplink RRC message transmission message and the RRC reconfiguration completion messages sent by terminal devices or IAB child nodes served by another IAB node are included in one different uplink RRC message transmission message, or the RRC reconfiguration completion messages sent by terminal devices served by one IAB node are included in one uplink RRC message transmission message and the RRC reconfiguration completion messages sent by IAB child nodes served by this IAB node are included in one different uplink RRC message transmission message.

[0283] For example, the RRC reconfiguration completion message includes a first RRC reconfiguration completion message and a second RRC reconfiguration completion message, the first RRC reconfiguration completion message is an RRC reconfiguration completion message generated by a first terminal device and / or a first child IAB node served by the first IAB node, the second RRC reconfiguration completion message is an RRC reconfiguration completion message generated by a second terminal device and / or a second child IAB node served by the first IAB node, the first IAB node sends a first uplink message including the first RRC reconfiguration completion message to a target IAB donor node via a target route, and the first IAB node sends a second uplink message including the second RRC reconfiguration completion message to a source IAB donor node, and the source IAB donor node sends the second RRC reconfiguration completion message to the target IAB donor node.

[0284] As can be seen from the above embodiments, by sending a first uplink message including an RRC reconfiguration completion message to the target IAB donor node via the target route, or by sending an RRC reconfiguration completion message to the target IAB donor node via the source IAB donor node, the target IAB donor node can obtain the RRC reconfiguration completion message of the terminal device and / or child IAB node served by the migration IAB node, and can know whether the terminal device and / or child IAB node have completed route switching, thereby resuming data transmission with the terminal device and / or child IAB node that was interrupted to perform the IAB-donor-CU migration or topology adaptation process of the migration IAB node. EXAMPLES

[0285] In an embodiment of the present invention, an IAB node migration device is provided, the device is applied to a first IAB donor node, and the first IAB donor node is a source IAB donor node of the first IAB node. Since the principle of the device to solve the problem is similar to that of the method in the second embodiment, the specific implementation of the device can refer to the implementation of the method in the second embodiment, and the duplicated description of the same content will be omitted here.

[0286] 19 is a diagram showing a migration device of an IAB node of the eighth embodiment of the present invention. As shown in FIG. 19, the device 1900 includes the following units:

[0287] A fifth receiving unit 1901: for receiving a second uplink message from a first IAB node, the second uplink message including an RRC reconfiguration complete message of a terminal device and / or a child IAB node served by the first IAB node; and A fifth sending unit 1902: Sends the RRC reconfiguration complete message to a target IAB donor node of the first IAB node.

[0288] In an embodiment of the present invention, the fifth sending unit 1902 can send an Xn message or an NG message including the RRC reconfiguration complete message to the target IAB donor node via an Xn interface or an NG interface.

[0289] For example, the second uplink message includes third indication information, and the third indication information is used to instruct the source IAB donor node to send the RRC reconfiguration complete message to the target IAB donor node.

[0290] For example, the second uplink message is a third F1 message.

[0291] For example, the third F1 message is at least one of a terminal device context establishment response message and a terminal device context modification response message, or the third F1 message is an uplink RRC message transmission message.

[0292] For example, the RRC reconfiguration completion message of the terminal device corresponding to the terminal device context establishment response message or the terminal device context modification response message is included in the terminal device context establishment response message or the terminal device context modification response message, or the terminal device context establishment response message or the terminal device context modification response message includes at least one of the RRC reconfiguration completion messages, and for one of the at least one RRC reconfiguration completion messages, the terminal device transmitting this RRC reconfiguration completion message is the same as or different from the terminal associated with the terminal device context establishment response message or the terminal device context modification response message.

[0293] For example, all RRC reconfiguration completion messages are included in one uplink RRC message transmission message, or the RRC reconfiguration completion messages sent by all terminal devices are included in one uplink RRC message transmission message and the RRC reconfiguration completion messages sent by all IAB child nodes are included in one different uplink RRC message transmission message, or the RRC reconfiguration completion messages sent by terminal devices or IAB child nodes served by one IAB node are included in one uplink RRC message transmission message and the RRC reconfiguration completion messages sent by terminal devices or IAB child nodes served by another IAB node are included in one different uplink RRC message transmission message, or the RRC reconfiguration completion messages sent by terminal devices served by one IAB node are included in one uplink RRC message transmission message and the RRC reconfiguration completion messages sent by IAB child nodes served by this IAB node are included in one different uplink RRC message transmission message.

[0294] For example, as shown in FIG. 19, the apparatus 1900 further includes the following units:

[0295] A sixth sending unit 1903: sending a first downlink message to the first IAB node, where the first downlink message includes a first RRC reconfiguration message; and A seventh sending unit 1904: Send a second downlink message to a source parent IAB node of the first IAB node, where the second downlink message includes a second RRC reconfiguration message, for example, the second uplink message is also a feedback message of the first downlink message.

[0296] The apparatus 1900 further includes a sixth receiving unit 1905, which is used for receiving a feedback message of the first downlink message.

[0297] FIG. 20 is another diagram illustrating a migration device of an IAB node in embodiment 8 of the present invention. As shown in FIG. 20, the device 2000 includes the following units:

[0298] A seventh receiving unit 2001: receives a feedback message of a first downlink message including a first RRC reconfiguration message from the first IAB node; and A seventh sending unit 2002: Sends a second downlink message to a source parent IAB node of the first IAB node, where the second downlink message includes a second RRC reconfiguration message.

[0299] For example, when the first IAB donor node receives feedback of the first RRC reconfiguration message from the first IAB node, it sends a second downlink message to a source parent IAB node of the first IAB node, where the second downlink message includes a second RRC reconfiguration message.

[0300] For example, as shown in FIG. 20, the apparatus 2000 further includes the following units:

[0301] An eighth sending unit 2003: sends the first downlink message to the first IAB node, where the first downlink message includes the first RRC reconfiguration message.

[0302] For example, the first RRC reconfiguration message includes a key configured by a target IAB donor node of the first IAB node.

[0303] For example, the first downlink message is a second F1 message.

[0304] For example, the first downlink message includes at least one of the following: second instruction information, the second instruction information being used for instructing to perform migration of an IAB node of a cross CU or instructing a terminal device setting to be performed for migration of an IAB node of a cross CU; a value of a first timer or a second timer, the first timer or the second timer being used for at least one of: the first IAB node initiating a random access procedure with a target parent IAB node, a distributed unit of the first IAB node establishing an F1 interface with a central unit of the target IAB donor node, and the first IAB node sending a feedback of a first RRC reconfiguration message to the source IAB donor node; and The number and / or ratio of at least one of terminal devices, child IAB nodes, messages, and feedback.

[0305] As can be seen from the above embodiments, by sending a first uplink message including an RRC reconfiguration completion message to the target IAB donor node via the target route, or by sending an RRC reconfiguration completion message to the target IAB donor node via the source IAB donor node, the target IAB donor node can obtain the RRC reconfiguration completion message of the terminal device and / or child IAB node served by the migration IAB node, and can know whether the terminal device and / or child IAB node have completed route switching, thereby resuming data transmission with the terminal device and / or child IAB node that was interrupted to perform the IAB-donor-CU migration or topology adaptation process of the migration IAB node. EXAMPLES

[0306] In an embodiment of the present invention, an IAB node migration device is provided, the device is applied to a second IAB donor node, and the second IAB donor node is a target IAB donor node of the first IAB node. Since the principle of the device to solve the problem is similar to that of the method of the third embodiment, the specific implementation of the device can refer to the implementation of the method of the third embodiment, and the same description will be omitted here.

[0307] 21 is a diagram showing a migration device of an IAB node of embodiment 9 of the present invention. As shown in FIG. 21, the device 2100 includes the following units:

[0308] an eighth receiving unit 2101 for receiving a first uplink message, including an RRC reconfiguration complete message, sent by the first IAB node via a target route; and / or A ninth receiving unit 2102 is used for receiving an Xn message or an NG message from a source IAB donor node, the RRC reconfiguration completion message being an RRC reconfiguration completion message of a terminal device and / or a child IAB node served by the first IAB node.

[0309] For example, the target path is an F1 interface between a distributed unit of the first IAB node and a central unit of the target IAB donor node.

[0310] For example, the RRC reconfiguration complete message from the source IAB donor node is sent via the Xn interface or the NG interface.

[0311] As can be seen from the above embodiments, by sending a first uplink message including an RRC reconfiguration completion message to the target IAB donor node via the target route, or by sending an RRC reconfiguration completion message to the target IAB donor node via the source IAB donor node, the target IAB donor node can obtain the RRC reconfiguration completion message of the terminal device and / or child IAB node served by the migration IAB node, and can know whether the terminal device and / or child IAB node have completed route switching, thereby resuming data transmission with the terminal device and / or child IAB node that was interrupted to perform the IAB-donor-CU migration or topology adaptation process of the migration IAB node. EXAMPLES

[0312] In an embodiment of the present invention, a network device is provided, which includes the IAB node migration device according to the seventh embodiment.

[0313] Fig. 22 is a block diagram showing a system configuration of a network device according to a tenth embodiment of the present invention. As shown in Fig. 22, a network device 2200 includes a processor 2210 and a memory 2220, and the memory 2220 is connected to the processor 2210. Note that this figure is merely an example, and other types of structures may be used to supplement or replace the structure to realize telecommunication functions or other functions.

[0314] In one implementation, the functionality of the IAB node migration device is integrated into the processor 2210. The processor 2210 may be configured to: receive an RRC reconfiguration complete message from a terminal device and / or a descendant IAB node served by the first IAB node; and send a first uplink message including the RRC reconfiguration complete message to a target IAB donor node via a target path, or send the RRC reconfiguration complete message to a target IAB donor node via a source IAB donor node.

[0315] In another implementation method, the migration device of the IAB node may be configured separately from the processor 2210, for example, the migration device of the IAB node may be configured as a chip connected to the processor 2210, and the function of the migration device of the IAB node may be realized under the control of the processor 2210.

[0316] In addition, as shown in Fig. 22, the network device 2200 may further include the following, namely, a transceiver 2240 and an antenna 2250, among which, the functions of these components are similar to those of the prior art, and therefore detailed description thereof will be omitted here. It should be noted that the network device 2200 does not need to include all the components shown in Fig. 22, and the network device 2200 may further include components not shown in Fig. 22, which can be referred to the prior art.

[0317] As can be seen from the above embodiments, by sending a first uplink message including an RRC reconfiguration completion message to the target IAB donor node via the target route, or by sending an RRC reconfiguration completion message to the target IAB donor node via the source IAB donor node, the target IAB donor node can obtain the RRC reconfiguration completion message of the terminal device and / or child IAB node served by the migration IAB node, and can know whether the terminal device and / or child IAB node have completed route switching, thereby resuming data transmission with the terminal device and / or child IAB node that was interrupted to perform the IAB-donor-CU migration or topology adaptation process of the migration IAB node. EXAMPLES

[0318] In an embodiment of the present invention, a network device is provided, which includes the IAB node migration device according to the eighth embodiment.

[0319] Fig. 23 is a block diagram showing a system configuration of a network device according to an eleventh embodiment of the present invention. As shown in Fig. 23, a network device 2300 includes a processor 2310 and a memory 2320, and the memory 2320 is connected to the processor 2310. The memory 2320 can store various data and can also store a program 2330 for information processing, and can execute the program 2330 under the control of the processor 2310 to receive various information transmitted by a terminal device and transmit various information to the terminal device.

[0320] In one implementation, the functionality of the migration device of the IAB node can be integrated into the processor 2310. Wherein, the processor 2310 may be configured to: receive a second uplink message from a first IAB node, the second uplink message including an RRC reconfiguration complete message of a terminal device and / or a child IAB node served by the first IAB node; and send the RRC reconfiguration complete message to a target IAB donor node of the first IAB node.

[0321] Alternatively, the processor 2310 may be configured to: receive a feedback message of a first downlink message from the first IAB node, the feedback message including a first RRC reconfiguration message; and send a second downlink message to a source parent IAB node of the first IAB node, the second downlink message including the second RRC reconfiguration message.

[0322] In another implementation method, the migration device of the IAB node may be configured separately from the processor 2310, for example, the migration device of the IAB node may be configured as a chip connected to the processor 2310, and the function of the migration device of the IAB node may be realized under the control of the processor 2310.

[0323] 23, the network device 2300 may further include the following, namely, a transceiver 2340 and an antenna 2350, among which the functions of these components are similar to those of the prior art, and therefore detailed description thereof will be omitted here. It is not necessary for the network device 2300 to include all the components shown in FIG. 23. The network device 2300 may further include components not shown in FIG. 23, which can be referred to the prior art.

[0324] As can be seen from the above embodiments, by sending a first uplink message including an RRC reconfiguration completion message to the target IAB donor node via the target route, or by sending an RRC reconfiguration completion message to the target IAB donor node via the source IAB donor node, the target IAB donor node can obtain the RRC reconfiguration completion message of the terminal device and / or child IAB node served by the migration IAB node, and can know whether the terminal device and / or child IAB node have completed route switching, thereby resuming data transmission with the terminal device and / or child IAB node that was interrupted to perform the IAB-donor-CU migration or topology adaptation process of the migration IAB node. EXAMPLES

[0325] In an embodiment of the present invention, a network device is provided, which includes an IAB node migration device according to the ninth embodiment.

[0326] Fig. 24 is a block diagram showing the system configuration of a network device according to a twelfth embodiment of the present invention. As shown in Fig. 24, a network device 2400 may include a processor 2410 and a memory 2420, and the memory 2420 is connected to the processor 2410. The memory 2420 can store various data and can also store a program 2430 for information processing, and can execute the program 2430 under the control of the processor 2410 to receive various information transmitted by a terminal device and transmit various information to the terminal device.

[0327] In one implementation, the function of the migration device of the IAB node can be integrated into the processor 2410. Wherein, the processor 2410 may be configured to: receive a first uplink message, including an RRC reconfiguration complete message, sent by the first IAB node via a target route; and / or receive an Xn message or an NG message, including an RRC reconfiguration complete message, from a source IAB donor node, where the RRC reconfiguration complete message is an RRC reconfiguration complete message of a terminal device and / or a child IAB node served by the first IAB node.

[0328] In another implementation method, the migration device of the IAB node may be configured separately from the processor 2410, for example, the migration device of the IAB node may be configured as a chip connected to the processor 2410, and the function of the migration device of the IAB node may be realized under the control of the processor 2410.

[0329] In addition, as shown in Fig. 24, the network device 2400 may further include the following, namely, a transceiver 2440 and an antenna 2450, etc., among which, the functions of these components are similar to those of the prior art, and therefore detailed description thereof will be omitted here. It is not necessary for the network device 2400 to include all the components shown in Fig. 24. In addition, the network device 2400 may further include components not shown in Fig. 24, and reference can be made to the prior art for this.

[0330] As can be seen from the above embodiments, by sending a first uplink message including an RRC reconfiguration completion message to the target IAB donor node via the target route, or by sending an RRC reconfiguration completion message to the target IAB donor node via the source IAB donor node, the target IAB donor node can obtain the RRC reconfiguration completion message of the terminal device and / or child IAB node served by the migration IAB node, and can know whether the terminal device and / or child IAB node have completed route switching, thereby resuming data transmission with the terminal device and / or child IAB node that was interrupted to perform the IAB-donor-CU migration or topology adaptation process of the migration IAB node. EXAMPLES

[0331] In an embodiment of the present invention, a communication system is provided.

[0332] For example, the communication system includes a first network device, a second network device and a terminal device, the first network device is the network device described in Example 11, and the second network device is the network device described in Example 12. In other words, the terminal device is directly connected to the IAB donor node.

[0333] Fig. 25 is a diagram showing a communication system in Example 13 of the present invention. As shown in Fig. 25, the communication system 2500 includes a first network device 2501, a second network device 2502, and a terminal device 2503, and the terminal device 2503 is directly connected to the first network device 2501 or the second network device 2502 as an IAB donor node.

[0334] Also, for example, the communication system includes a first network device and a terminal device, the first network device is a network device described in Example 11 or 12, the terminal device is directly connected to an IAB donor node, and the IAB donor node is a source IAB donor node or a target IAB donor node.

[0335] 26 is another diagram showing a communication system in Example 13 of the present invention. As shown in Fig. 26, the communication system 2600 includes a first network device 2601 and a terminal device 2602, and the terminal device 2602 is directly connected to the first network device 2601 as an IAB donor node.

[0336] Also, for example, the communication system includes a first network device, a second network device, a third network device and a terminal device, the first network device is the network device described in Example 11, the second network device is the network device described in Example 12, and the third network device is the network device described in Example 10. In other words, the third network device is a relay node, i.e., a first IAB node.

[0337] 27 is another diagram showing a communication system in Example 13 of the present invention. As shown in FIG. 27, the communication system 2700 includes a first network device 2701, a second network device 2702, a third network device 2703 and a terminal device 2704, in which the third network device 2703 is a relay node, that is, a first IAB node, and the terminal device 2704 is connected to the first network device 2701 or the second network device 2702 via the third network device 2703.

[0338] Also, for example, the communication system includes a first network device, a second network device, a third network device, a fourth network device and a terminal device, the first network device is the network device described in Example 11, the second network device is the network device described in Example 12, and the third network device is the network device described in Example 10. In other words, the third network device is a relay node, i.e., a first IAB node, and the fourth network device is a child node of the first IAB node. The terminal device is a terminal device served by the child node of the first IAB node, or the terminal device is a terminal device served by the first IAB node.

[0339] Figure 28 is another diagram showing a communication system in Example 13 of the present invention. As shown in Figure 28, the communication system 2800 includes a first network device 2801, a second network device 2802, a third network device 2803, a fourth network device 2804 and a terminal device 2805, in which the third network device 2803 is a relay node, i.e., a first IAB node, the fourth network device 2804 is a child IAB node of the third network device 2803, i.e., the first IAB node, and the terminal device 2805 is a terminal device served by the fourth network device 2804, i.e., the child IAB node of the first IAB node.

[0340] Figure 29 is another diagram showing a communication system in embodiment 13 of the present invention. As shown in Figure 29, the communication system 2900 includes a first network device 2901, a second network device 2902, a third network device 2903, a fourth network device 2904 and a terminal device 2905, in which the third network device 2903 is a relay node, i.e., a first IAB node, the fourth network device 2904 is a child IAB node of the third network device 2903, i.e., the first IAB node, and the terminal device 2905 is a terminal device served by the third network device 2903, i.e., the first IAB node.

[0341] Also, for example, the communication system includes a first network device, a third network device and a terminal device, the first network device is the network device described in Example 11 or 12, and the third network device is the network device described in Example 10. In other words, the third network device is a relay node, i.e., a first IAB node.

[0342] Figure 30 is another diagram showing a communication system in embodiment 13 of the present invention. As shown in Figure 30, the communication system 3000 includes a first network device 3001, a third network device 3002 and a terminal device 3003, in which the third network device 3002 is a relay node, i.e., a first IAB node, and the first network device 3001 is a source IAB donor node or a target IAB donor node of the first IAB node.

[0343] Also, for example, the communication system includes a first network device, a third network device, a fourth network device and a terminal device, the first network device is the network device according to the embodiment 11 or 12, and the third network device is the network device according to the embodiment 10. In other words, the third network device is a relay node, i.e., a first IAB node, and the fourth network device is a child node of the first IAB node. The terminal device is a terminal device served by the child node of the first IAB node, or the terminal device is a terminal device served by the first IAB node.

[0344] Figure 31 is another diagram showing a communication system in embodiment 13 of the present invention. As shown in Figure 31, the communication system 3100 includes a first network device 3101, a third network device 3102, a fourth network device 3103 and a terminal device 3104, in which the third network device 3102 is a relay node, i.e., a first IAB node, the fourth network device 3103 is a child IAB node of the third network device 3102, i.e., the first IAB node, and the terminal device 3104 is a terminal device served by the fourth network device 3103, i.e., the child IAB node of the first IAB node.

[0345] Figure 32 is another diagram showing a communication system in embodiment 13 of the present invention. As shown in Figure 32, the communication system 3200 includes a first network device 3201, a third network device 3202, a fourth network device 3203 and a terminal device 3204, in which the third network device 3202 is a relay node, i.e., a first IAB node, the fourth network device 3203 is a child IAB node of the third network device 3202, i.e., the first IAB node, and the terminal device 3204 is a terminal device served by the third network device 3202, i.e., the first IAB node.

[0346] The above-mentioned devices and methods may be realized by software or hardware, or may be realized by a combination of hardware and software. The present invention further relates to a computer readable program, which, when executed by a logic component, causes the logic component to realize the above-mentioned devices or components, or causes the logic component to realize the various methods or steps described above. The logic component may be, for example, a Field Programmable Gate Array (FPGA), a microprocessor, a processor for use in a computer, etc. The present invention also relates to a storage medium, such as a hard disk, a magnetic disk, an optical hard disk, a DVD, a flash memory, etc., storing the above-mentioned program.

[0347] Additionally, one or more combinations of the functional blocks illustrated in the figures and / or one or more combinations of the functional blocks may be implemented as a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic component, a discrete gate or transistor logic component, a discrete hardware assembly, or any other suitable combination for performing the functions described herein. Also, one or more combinations of the functional blocks illustrated in the figures and / or one or more combinations of the functional blocks may be further configured as a combination of computing devices, such as a combination of a DSP and a microprocessor, a combination of multiple microprocessors, one or more microprocessors in communication with a DSP, or any other configuration.

[0348] Although the preferred embodiments of the present invention have been described above, the present invention is not limited to such embodiments, and any modifications to the present invention that do not depart from the spirit of the present invention belong to the technical scope of the present invention.

[0349] Furthermore, with respect to the above-mentioned embodiments, the following supplementary notes are disclosed.

[0350] (Appendix 1) (Appendix 1) A migration device for an IAB node, the device being applied to a first IAB node, the device comprising: A first receiving unit for receiving an RRC reconfiguration completion message of a terminal device and / or a descendant IAB node served by the first IAB node; and The apparatus includes a first transmitting unit for transmitting a first uplink message including the RRC reconfiguration complete message to a target IAB (IAB-donor) donor node via a target route, or for transmitting the RRC reconfiguration complete message to the target IAB donor node by a source IAB donor node.

[0351] (Supplementary Note 2) The device according to Supplementary Note 1, The first transmitting unit: a first storage unit for storing the RRC reconfiguration completion message; a first establishing unit for establishing the target path; and a second transmitting unit for transmitting the first uplink message to a target IAB donor node via the target route.

[0352] (Appendix 3) 3. The apparatus of claim 2, The apparatus further includes a first suspending unit, which suspends service with the terminal device and / or the child IAB node when a first condition is satisfied.

[0353] (Appendix 4) 4. The apparatus of claim 3, The first condition includes at least one of the following conditions: The first IAB node transmits an RRC reconfiguration message to all terminal devices and / or child IAB nodes it serves, or receives an RRC reconfiguration complete message from all terminal devices and / or child IAB nodes it serves; The first timer has expired; the number of terminal devices and / or child IAB nodes that have transmitted an RRC reconfiguration message, received a feedback message for an RRC reconfiguration message, or received an RRC reconfiguration complete message by the first IAB node reaches a first setting value, and / or the ratio of terminal devices and / or child IAB nodes that have transmitted an RRC reconfiguration message, received a feedback message for an RRC reconfiguration message, or received an RRC reconfiguration complete message by the first IAB node reaches a first ratio; and A device, wherein the condition is that the number of RRC reconfiguration messages sent by the first IAB node to a terminal device and / or child IAB node served by the first IAB node, or the number of feedback messages of RRC reconfiguration messages of terminal devices and / or child IAB nodes served by the first IAB node received, or the number of RRC reconfiguration completion messages of terminal devices and / or child IAB nodes served by the first IAB node received, reaches a second set value, and / or the ratio of RRC reconfiguration messages sent by the first IAB node to a terminal device and / or child IAB node served by the first IAB node, or the ratio of feedback messages of RRC reconfiguration messages of terminal devices and / or child IAB nodes served by the first IAB node received, or the ratio of RRC reconfiguration completion messages of terminal devices and / or child IAB nodes served by the first IAB node received, reaches a second ratio.

[0354] (Appendix 5) 3. The apparatus of claim 2, The apparatus further includes a third sending unit, which sends a feedback message of the first downlink message to the source IAB donor node when a second condition is satisfied.

[0355] (Appendix 6) 6. The apparatus of claim 5, The second condition includes at least one of the following conditions: The first IAB node transmits an RRC reconfiguration message to all terminal devices and / or child IAB nodes it serves, or receives an RRC reconfiguration complete message from all terminal devices and / or child IAB nodes it serves; The second timer has expired; the number of terminal devices and / or child IAB nodes that have transmitted an RRC reconfiguration message, received a feedback message for an RRC reconfiguration message, or received an RRC reconfiguration complete message by the first IAB node reaches a third set value, and / or the ratio of terminal devices and / or child IAB nodes that have transmitted an RRC reconfiguration message, received a feedback message for an RRC reconfiguration message, or received an RRC reconfiguration complete message by the first IAB node reaches a third ratio; and A device, wherein the condition is that the number of RRC reconfiguration messages sent by the first IAB node to a terminal device and / or child IAB node served by the first IAB node, or the number of feedback messages of RRC reconfiguration messages of terminal devices and / or child IAB nodes served by the first IAB node received, or the number of RRC reconfiguration completion messages of terminal devices and / or child IAB nodes served by the first IAB node received, reaches a fourth set value, and / or the ratio of RRC reconfiguration messages sent by the first IAB node to a terminal device and / or child IAB node served by the first IAB node, or the ratio of feedback messages of RRC reconfiguration messages of terminal devices and / or child IAB nodes served by the first IAB node received, or the ratio of RRC reconfiguration completion messages of terminal devices and / or child IAB nodes served by the first IAB node received, reaches a fourth ratio.

[0356] (Appendix 7) An apparatus according to any one of claims 2-6, Further including a second receiving unit, which receives the first indication information; An apparatus, wherein the first instruction information is used to indicate that the RRC reconfiguration completion message is an RRC reconfiguration completion message protected by security settings configured by a target IAB donor node, or to indicate that the RRC reconfiguration completion message is to be sent to the target IAB donor node, or to indicate that the first IAB node is to store the RRC reconfiguration completion message.

[0357] (Appendix 8) 8. The apparatus of claim 7, further comprising: The first indication information is included in an RLC unit header or a MAC unit header.

[0358] (Appendix 9) 9. The apparatus of claim 7 or 8, The apparatus further includes a second storage unit, which is used by a MAC layer or an RLC layer or a BAP layer of a distributed unit of the first IAB node to store the RRC reconfiguration complete message.

[0359] (Appendix 10) 9. The apparatus of claim 7 or 8, further comprising: a first transmission unit used by the MAC layer of the distributed unit of the first IAB node to transmit the first indication information to the RLC layer; or a third storage unit used by the BAP layer of the IAB-MT to store the RRC reconfiguration complete message when the first IAB node IAB-DU receives the first indication information; or a fourth storage unit used by the BAP layer of the IAB-DU to store the RRC reconfiguration complete message when the first indication information is from a child IAB node served by the first IAB node; or The apparatus includes a second transmission unit used for transmitting the first indication information to a BAP layer by a MAC layer or an RLC layer of an IAB-DU of the first IAB node.

[0360] (Appendix 11) An apparatus according to any one of claims 2-10, The first transmitting unit further comprises: a third receiving unit for receiving a second RRC reconfiguration message from the source parent IAB node; a random access unit that initiates a random access procedure to a target parent node of the first IAB node based on the second RRC reconfiguration message; and The apparatus includes a first switching unit for switching to a target path.

[0361] (Appendix 12) An apparatus according to any one of claims 2-11, The target path is an F1 interface between a distributed unit (DU) of the first IAB node and a central unit (CU) of the target IAB donor node.

[0362] (Appendix 13) An apparatus according to any one of claims 1 to 12, The first uplink message is a first F1 message.

[0363] (Appendix 14) 14. The apparatus of claim 13, further comprising: The first F1 message is at least one of a terminal device context establishment response message and a terminal device context modification response message.

[0364] (Appendix 15) 15. The apparatus of claim 14, further comprising: The RRC reconfiguration completion message of the terminal device corresponding to the terminal device context establishment response message or the terminal device context modification response message is included in the terminal device context establishment response message or the terminal device context modification response message; or The terminal device context establishment response message or the terminal device context modification response message includes at least one of the RRC reconfiguration completion messages, and for one of the at least one RRC reconfiguration completion messages, a terminal device that transmits this RRC reconfiguration completion message is the same as or different from a terminal device associated with the terminal device context establishment response message or the terminal device context modification response message.

[0365] (Appendix 16) 14. The apparatus of claim 13, further comprising: The first F1 message is an uplink RRC message transfer (UL RRC Message Transfer) message.

[0366] (Appendix 17) 17. The apparatus of claim 16, further comprising: All RRC reconfiguration complete messages are contained in one uplink RRC message transmission message; or The RRC reconfiguration complete messages sent by all terminal devices are included in one uplink RRC message transmission message, and the RRC reconfiguration complete messages sent by all IAB child nodes are included in one different uplink RRC message transmission message; or An RRC reconfiguration completion message sent by a terminal device or an IAB child node served by one IAB node is included in one uplink RRC message transmission message, and an RRC reconfiguration completion message sent by a terminal device or an IAB child node served by another IAB node is included in one different uplink RRC message transmission message; or An apparatus, in which an RRC reconfiguration completion message sent by a terminal device served by one IAB node is included in one uplink RRC message transmission message, and an RRC reconfiguration completion message sent by an IAB child node served by this IAB node is included in one different uplink RRC message transmission message.

[0367] (Appendix 18) An apparatus according to any one of claims 1-17, comprising: Further comprising a fourth receiving unit, which is used to receive the first downlink message from the source IAB donor node; The device, wherein the first downlink message includes a first RRC reconfiguration message, and the first RRC reconfiguration message includes a key configured by the target IAB donor node.

[0368] (Appendix 19) 19. The apparatus of claim 18, further comprising: The first downlink message is a second F1 message.

[0369] (Appendix 20) 20. The apparatus of claim 18 or 19, The first downlink message includes at least one of the following: second instruction information, the second instruction information being used for instructing to perform migration of an IAB node of a cross CU or for instructing a terminal device setting to be performed for migration of an IAB node of a cross CU; a value of a first timer or a second timer, the first timer or the second timer being used for at least one of: the first IAB node initiating a random access procedure with a target parent IAB node, a distributed unit of the first IAB node establishing an F1 interface with a central unit of the target IAB donor node, and the first IAB node sending a feedback of a first RRC reconfiguration message to the source IAB donor node; and An apparatus, which is a number and / or ratio of at least one of terminal devices, child IAB nodes, messages, and feedback.

[0370] (Appendix 21) 2. The apparatus of claim 1, The first transmitting unit: a fourth sending unit, which sends a second uplink message including the RRC reconfiguration complete message to a source IAB donor node; The RRC reconfiguration complete message is sent from the source IAB donor node to the target IAB donor node.

[0371] (Appendix 22) 22. The apparatus of claim 21, The RRC reconfiguration complete message is sent by the source IAB donor node to the target IAB donor node via an Xn interface or an NG interface.

[0372] (Appendix 23) 23. The apparatus of claim 1, 21 or 22, the second uplink message includes third instruction information; The third instruction information is used by the source IAB donor node to send the RRC reconfiguration complete message to the target IAB donor node.

[0373] (Appendix 24) An apparatus according to any one of claims 1, 21-23, comprising: The second uplink message is a third F1 message.

[0374] (Appendix 25) 25. The apparatus of claim 24, The third F1 message is at least one of a terminal device context establishment response message or a terminal device context modification response message.

[0375] (Appendix 26) 26. The apparatus of claim 25, The RRC reconfiguration completion message of the terminal device corresponding to the terminal device context establishment response message or the terminal device context modification response message is included in the terminal device context establishment response message or the terminal device context modification response message; or The terminal device context establishment response message or the terminal device context modification response message includes at least one of the RRC reconfiguration completion messages, and for one of the at least one RRC reconfiguration completion messages, a terminal device that transmits this RRC reconfiguration completion message is the same as or different from a terminal device associated with the terminal device context establishment response message or the terminal device context modification response message.

[0376] (Appendix 27) 25. The apparatus of claim 24, The third F1 message is an uplink RRC message transfer message.

[0377] (Appendix 28) 28. The apparatus of claim 27, further comprising: All RRC reconfiguration complete messages are contained in one uplink RRC message transmission message; or The RRC reconfiguration complete messages sent by all terminal devices are included in one uplink RRC message transmission message, and the RRC reconfiguration complete messages sent by all IAB child nodes are included in one different uplink RRC message transmission message; or An RRC reconfiguration completion message sent by a terminal device or an IAB child node served by one IAB node is included in one uplink RRC message transmission message, and an RRC reconfiguration completion message sent by a terminal device or an IAB child node served by another IAB node is included in one different uplink RRC message transmission message; or An apparatus, in which an RRC reconfiguration completion message sent by a terminal device served by one IAB node is included in one uplink RRC message transmission message, and an RRC reconfiguration completion message sent by an IAB child node served by this IAB node is included in one different uplink RRC message transmission message.

[0378] (Appendix 29) An apparatus according to any one of claims 1-28, comprising: The RRC reconfiguration completion message includes a first RRC reconfiguration completion message and a second RRC reconfiguration completion message, the first RRC reconfiguration completion message is an RRC reconfiguration completion message generated by a first terminal device and / or a first child IAB node served by the first IAB node, and the second RRC reconfiguration completion message is an RRC reconfiguration completion message generated by a second terminal device and / or a second child IAB node served by the first IAB node; An apparatus for transmitting a first uplink message including the first RRC reconfiguration completion message to a target IAB donor node via a target route of the first IAB node, and the first IAB node transmits a second uplink message including the second RRC reconfiguration completion message to a source IAB donor node, and the source IAB donor node transmits the second RRC reconfiguration completion message to a target IAB donor node.

[0379] (Appendix 30) A migration apparatus for an IAB node, the apparatus being applied to a first IAB donor node, the first IAB donor node being a source IAB donor node of the first IAB node; The apparatus comprises: a fifth receiving unit for receiving a second uplink message from the first IAB node, the second uplink message including an RRC reconfiguration complete message of a terminal device and / or a child IAB node served by the first IAB node; and a fifth sending unit for sending the RRC reconfiguration complete message to a target IAB donor node of the first IAB node.

[0380] (Appendix 31) 31. The apparatus of claim 30, The fifth sending unit sends an Xn message or an NG message including the RRC reconfiguration complete message to a target IAB donor node via an Xn interface or an NG interface.

[0381] (Appendix 32) 32. The apparatus of claim 30 or 31, the second uplink message includes third instruction information; The third instruction information is used by the source IAB donor node to send the RRC reconfiguration complete message to the target IAB donor node.

[0382] (Appendix 33) An apparatus according to any one of claims 30-32, comprising: The second uplink message is a third F1 message.

[0383] (Appendix 34) An apparatus according to any one of claims 30-33, comprising: The third F1 message is at least one of an establish terminal context response message and a modify terminal context response message; or The third F1 message is an uplink RRC message transmission message.

[0384] (Appendix 35) 35. The apparatus of claim 34, further comprising: The RRC reconfiguration completion message of the terminal device corresponding to the terminal device context establishment response message or the terminal device context modification response message is included in the terminal device context establishment response message or the terminal device context modification response message; or The terminal device context establishment response message or the terminal device context modification response message includes at least one of the RRC reconfiguration completion messages, and for one of the at least one RRC reconfiguration completion messages, a terminal device that transmits this RRC reconfiguration completion message is the same as or different from a terminal associated with the terminal device context establishment response message or the terminal device context modification response message.

[0385] (Appendix 36) 35. The apparatus of claim 34, further comprising: All RRC reconfiguration complete messages are contained in one uplink RRC message transmission message; or The RRC reconfiguration complete messages sent by all terminal devices are included in one uplink RRC message transmission message, and the RRC reconfiguration complete messages sent by all IAB child nodes are included in one different uplink RRC message transmission message; or An RRC reconfiguration completion message sent by a terminal device or an IAB child node served by one IAB node is included in one uplink RRC message transmission message, and an RRC reconfiguration completion message sent by a terminal device or an IAB child node served by another IAB node is included in one different uplink RRC message transmission message; or An apparatus, in which an RRC reconfiguration completion message sent by a terminal device served by one IAB node is included in one uplink RRC message transmission message, and an RRC reconfiguration completion message sent by an IAB child node served by this IAB node is included in one different uplink RRC message transmission message.

[0386] (Appendix 37) An apparatus according to any one of claims 30-36, comprising: The apparatus further includes a sixth transmitting unit, which is used for transmitting a first downlink message to the first IAB node, the first downlink message including a first RRC reconfiguration message.

[0387] (Appendix 38) 31. The apparatus of claim 30, The second uplink message is also a feedback message of the first downlink message; or The apparatus further includes a sixth receiving unit, which is used for receiving a feedback message of the first downlink message.

[0388] (Appendix 39) A migration device for an IAB node, the device being applied to a first IAB donor node, the first IAB donor node being a source IAB donor node of the first IAB node; The apparatus comprises: a seventh receiving unit for receiving a feedback message of a first downlink message including a first RRC reconfiguration message from the first IAB node; and The apparatus includes a seventh transmitting unit for transmitting a second downlink message to a source parent IAB node of the first IAB node, the second downlink message including a second RRC reconfiguration message.

[0389] (Appendix 40) 40. The apparatus of claim 39, further comprising: The apparatus, wherein the first IAB donor node, when receiving feedback of a first RRC reconfiguration message from the first IAB node, sends a second downlink message to a source parent IAB node of the first IAB node, the second downlink message including a second RRC reconfiguration message.

[0390] (Appendix 41) 41. The apparatus of claim 39 or 40, The apparatus, further comprising an eighth transmitting unit, which transmits the first downlink message to the first IAB node, the first downlink message including the first RRC reconfiguration message.

[0391] (Appendix 42) An apparatus according to any one of claims 39-41, comprising: The first RRC reconfiguration message includes a key configured by a target IAB donor node of the first IAB node.

[0392] (Appendix 43) An apparatus according to any one of claims 39-42, comprising: The first downlink message is a second F1 message.

[0393] (Appendix 44) An apparatus according to any one of claims 39-42, comprising: The first downlink message includes at least one of the following: second instruction information, the second instruction information being used for instructing to perform migration of an IAB node of a cross CU or for instructing a terminal device setting to be performed for migration of an IAB node of a cross CU; a value of a first timer or a second timer, the first timer or the second timer being used for at least one of: the first IAB node initiating a random access procedure with a target parent IAB node, a distributed unit of the first IAB node establishing an F1 interface with a central unit of the target IAB donor node, and the first IAB node sending a feedback of a first RRC reconfiguration message to the source IAB donor node; and An apparatus, which is a number and / or ratio of at least one of terminal devices, child IAB nodes, messages, and feedback.

[0394] (Appendix 45) A migration apparatus for an IAB node, the apparatus being applied to a second IAB donor node, the second IAB donor node being a target IAB donor node of a first IAB node; The apparatus comprises: an eighth receiving unit for receiving a first uplink message, the first IAB node sending the first uplink message via a target route, the first uplink message including an RRC reconfiguration complete message; and / or A ninth receiving unit for receiving an Xn message or an NG message including an RRC reconfiguration complete message from the source IAB donor node; The RRC reconfiguration complete message is an RRC reconfiguration complete message of a terminal device and / or a child IAB node served by the first IAB node.

[0395] (Appendix 46) 46. ​​The apparatus of claim 45, The target path is an F1 interface between a distributed unit of the first IAB node and a central unit of the target IAB donor node.

[0396] (Appendix 47) 46. ​​The apparatus of claim 45, A device, wherein the RRC reconfiguration completion message of the source IAB donor node is transmitted via an Xn interface or an NG interface.

[0397] (Appendix 48) A network device comprising a device according to any one of appendixes 1-47.

[0398] (Appendix 49) A communication system including a first network device, a second network device, and a terminal device, The first network device comprises a device according to any one of claims 30-44; The second network device comprises a device according to any one of claims 45-47.

[0399] (Appendix 50) A communication system including a first network device and a terminal device, The first network device comprises a device according to any one of claims 30-44; or The first network device comprises a device according to any one of claims 45-47. (Appendix 51) A communication system including a first network device, a second network device, a third network device, and a terminal device, The first network device comprises a device according to any one of claims 30-44; The second network device comprises a device according to any one of claims 45-47; A communication system, wherein the third network device includes a device described in any one of appendices 1-29.

[0400] (Appendix 52) A communication system including a first network device, a second network device, a third network device, a fourth network device, and a terminal device, The first network device comprises a device according to any one of claims 30-44; The second network device comprises a device according to any one of claims 45-47; The third network device comprises a device according to any one of claims 1-29; The fourth network device is a child node of the first IAB node.

[0401] (Appendix 53) 53. The communication system of claim 52, further comprising: the terminal is a terminal served by a first IAB node; or A communication system, wherein the terminal device is a terminal device served by a child IAB node of a first IAB node.

[0402] (Appendix 2) (Appendix 1) A method for migrating an IAB node, the method being applied to a first IAB node, the method comprising: receiving an RRC reconfiguration complete message from a terminal device and / or a descendant IAB node served by the first IAB node; and A method comprising: transmitting a first uplink message including the RRC reconfiguration complete message to a target IAB (IAB-donor) donor node via a target route; or transmitting the RRC reconfiguration complete message to the target IAB donor node by a source IAB donor node.

[0403] (Appendix 2) 2. The method according to claim 1, comprising: transmitting a first uplink message including the RRC reconfiguration complete message to a target IAB donor node via the target route; storing the RRC reconfiguration complete message; Establishing said target path; and transmitting the first uplink message to a target IAB donor node over the target route.

[0404] (Appendix 3) The method according to claim 2, further comprising: suspending service with the terminal device and / or the child IAB node when a first condition is satisfied.

[0405] (Appendix 4) 4. The method according to claim 3, comprising: The first condition includes at least one of the following conditions: The first IAB node transmits an RRC reconfiguration message to all terminal devices and / or child IAB nodes it serves, or receives an RRC reconfiguration complete message from all terminal devices and / or child IAB nodes it serves; The first timer has expired; the number of terminal devices and / or child IAB nodes that have transmitted an RRC reconfiguration message, received a feedback message for an RRC reconfiguration message, or received an RRC reconfiguration complete message by the first IAB node reaches a first setting value, and / or the ratio of terminal devices and / or child IAB nodes that have transmitted an RRC reconfiguration message, received a feedback message for an RRC reconfiguration message, or received an RRC reconfiguration complete message by the first IAB node reaches a first ratio; and A method in which the condition is that the number of RRC reconfiguration messages sent by the first IAB node to a terminal device and / or child IAB node served by the first IAB node, or the number of feedback messages of RRC reconfiguration messages received of a terminal device and / or child IAB node served by the first IAB node, or the number of RRC reconfiguration completion messages received of a terminal device and / or child IAB node served by the first IAB node, reaches a second set value, and / or the ratio of RRC reconfiguration messages sent by the first IAB node to a terminal device and / or child IAB node served by the first IAB node, or the ratio of feedback messages of RRC reconfiguration messages received of a terminal device and / or child IAB node served by the first IAB node, or the ratio of RRC reconfiguration completion messages received of a terminal device and / or child IAB node served by the first IAB node, reaches a second ratio.

[0406] (Appendix 5) The method according to claim 2, further comprising: sending a feedback message of the first downlink message to the source IAB donor node when a second condition is satisfied.

[0407] (Appendix 6) 6. The method according to claim 5, The second condition includes at least one of the following conditions: The first IAB node transmits an RRC reconfiguration message to all terminal devices and / or child IAB nodes it serves, or receives an RRC reconfiguration complete message from all terminal devices and / or child IAB nodes it serves; The second timer has expired; the number of terminal devices and / or child IAB nodes that have transmitted an RRC reconfiguration message, received a feedback message for an RRC reconfiguration message, or received an RRC reconfiguration complete message by the first IAB node reaches a third set value, and / or the ratio of terminal devices and / or child IAB nodes that have transmitted an RRC reconfiguration message, received a feedback message for an RRC reconfiguration message, or received an RRC reconfiguration complete message by the first IAB node reaches a third ratio; and A method according to the present invention, wherein the condition is that the number of RRC reconfiguration messages sent by the first IAB node to a terminal device and / or child IAB node served by the first IAB node, or the number of feedback messages of RRC reconfiguration messages received by the first IAB node to a terminal device and / or child IAB node served by the first IAB node, or the number of RRC reconfiguration completion messages received by the terminal device and / or child IAB node served by the first IAB node, reaches a fourth set value, and / or the ratio of RRC reconfiguration messages sent by the first IAB node to a terminal device and / or child IAB node served by the first IAB node, or the ratio of feedback messages of RRC reconfiguration messages received by the terminal device and / or child IAB node served by the first IAB node, or the ratio of RRC reconfiguration completion messages received by the terminal device and / or child IAB node served by the first IAB node, reaches a fourth ratio.

[0408] (Appendix 7) The method according to any one of appendixes 2-6, further comprising: receiving a first instruction; A method in which the first instruction information is used to indicate that the RRC reconfiguration completion message is an RRC reconfiguration completion message protected by security settings configured by a target IAB donor node, or to indicate that the RRC reconfiguration completion message is to be sent to the target IAB donor node, or to indicate that the first IAB node stores the RRC reconfiguration completion message.

[0409] (Appendix 8) 8. The method according to claim 7, The first indication information is included in an RLC unit header or a MAC unit header.

[0410] (Appendix 9) The method according to claim 7 or 8, further comprising: The method includes the MAC layer, the RLC layer, or the BAP layer of a distributed unit of the first IAB node storing the RRC reconfiguration complete message.

[0411] (Appendix 10) The method according to claim 7 or 8, further comprising: The MAC layer of the distributed unit of the first IAB node transmits the first indication information to the RLC layer; or When the first IAB node IAB-DU receives the first indication information, the BAP layer of the IAB-MT stores the RRC reconfiguration complete message; or If the first indication information is from a child IAB node served by the first IAB node, the BAP layer of the IAB-DU stores the RRC reconfiguration complete message; or a MAC layer or an RLC layer of an IAB-DU of the first IAB node transmitting the first indication information to a BAP layer. (Appendix 11) A method according to any one of claims 2 to 10, comprising: Sending a first uplink message including the RRC reconfiguration complete message to a target IAB donor node via the target route further includes: receiving a second RRC reconfiguration message from the source parent IAB node; Initiating a random access procedure to a target parent node of the first IAB node based on the second RRC reconfiguration message; and switching to a target path.

[0412] (Appendix 12) A method according to any one of claims 2-11, comprising: The method, wherein the target path is an F1 interface between a distributed unit (DU) of the first IAB node and a central unit (CU) of the target IAB donor node.

[0413] (Appendix 13) A method according to any one of claims 1 to 12, comprising: The method, wherein the first uplink message is a first F1 message.

[0414] (Appendix 14) 14. The method according to claim 13, comprising: A method in which the first F1 message is at least one of a terminal device context establishment response message and a terminal device context modification response message.

[0415] (Appendix 15) 15. The method according to claim 14, The RRC reconfiguration completion message of the terminal device corresponding to the terminal device context establishment response message or the terminal device context modification response message is included in the terminal device context establishment response message or the terminal device context modification response message; or A method in which the terminal device context establishment response message or the terminal device context modification response message includes at least one of the RRC reconfiguration completion messages, and for one of the at least one RRC reconfiguration completion messages, a terminal device transmitting this RRC reconfiguration completion message is the same as or different from a terminal device associated with the terminal device context establishment response message or the terminal device context modification response message.

[0416] (Appendix 16) 14. The method according to claim 13, comprising: The method, wherein the first F1 message is an uplink RRC message transfer message.

[0417] (Appendix 17) 17. The method of claim 16, comprising: All RRC reconfiguration complete messages are contained in one uplink RRC message transmission message; or The RRC reconfiguration complete messages sent by all terminal devices are included in one uplink RRC message transmission message, and the RRC reconfiguration complete messages sent by all IAB child nodes are included in one different uplink RRC message transmission message; or An RRC reconfiguration completion message sent by a terminal device or an IAB child node served by one IAB node is included in one uplink RRC message transmission message, and an RRC reconfiguration completion message sent by a terminal device or an IAB child node served by another IAB node is included in one different uplink RRC message transmission message; or A method in which an RRC reconfiguration completion message transmitted by a terminal device served by one IAB node is included in one uplink RRC message transmission message, and an RRC reconfiguration completion message transmitted by an IAB child node served by this IAB node is included in one different uplink RRC message transmission message.

[0418] (Appendix 18) The method according to any one of claims 1 to 17, further comprising: receiving a first downlink message from a source IAB donor node; The method, wherein the first downlink message includes a first RRC reconfiguration message, and the first RRC reconfiguration message includes a key configured by the target IAB donor node.

[0419] (Appendix 19) 19. The method according to claim 18, comprising: The method, wherein the first downlink message is a second F1 message.

[0420] (Appendix 20) 20. The method according to claim 18 or 19, The first downlink message includes at least one of the following: second instruction information, the second instruction information being used for instructing to perform migration of an IAB node of a cross CU or for instructing a terminal device setting to be performed for migration of an IAB node of a cross CU; a value of a first timer or a second timer, the first timer or the second timer being used for at least one of: the first IAB node initiating a random access procedure with a target parent IAB node, a distributed unit of the first IAB node establishing an F1 interface with a central unit of the target IAB donor node, and the first IAB node sending a feedback of a first RRC reconfiguration message to the source IAB donor node; and A method, wherein the number and / or ratio of at least one of terminal devices, child IAB nodes, messages, and feedback.

[0421] (Appendix 21) 2. The method according to claim 1, comprising: sending, by the first IAB node (source IAB donor node), the RRC reconfiguration complete message to a target IAB donor node; the first IAB node sending a second uplink message to a source IAB donor node, the second uplink message including the RRC reconfiguration complete message; The RRC reconfiguration complete message is sent from the source IAB donor node to the target IAB donor node.

[0422] (Appendix 22) 22. The method according to claim 21, The RRC reconfiguration complete message is sent by the source IAB donor node to the target IAB donor node via an Xn interface or an NG interface.

[0423] (Appendix 23) 23. The method according to claim 1, 21 or 22, the second uplink message includes third instruction information; The third instruction information is used by the source IAB donor node to send the RRC reconfiguration complete message to the target IAB donor node.

[0424] (Appendix 24) A method according to any one of claims 1, 21-23, comprising: The second uplink message is a third F1 message.

[0425] (Appendix 25) 25. The method according to claim 24, A method in which the third F1 message is at least one of a terminal device context establishment response message or a terminal device context modification response message.

[0426] (Appendix 26) 26. The method according to claim 25, The RRC reconfiguration completion message of the terminal device corresponding to the terminal device context establishment response message or the terminal device context modification response message is included in the terminal device context establishment response message or the terminal device context modification response message; or The method includes the terminal device context establishment response message or the terminal device context modification response message including at least one of the RRC reconfiguration completion messages, and for one of the at least one RRC reconfiguration completion messages, a terminal device transmitting this RRC reconfiguration completion message is the same as or different from a terminal associated with the terminal device context establishment response message or the terminal device context modification response message.

[0427] (Appendix 27) 25. The method according to claim 24, The method, wherein the third F1 message is an uplink RRC message transfer message.

[0428] (Appendix 28) 28. The method according to claim 27, comprising: All RRC reconfiguration complete messages are contained in one uplink RRC message transmission message; or The RRC reconfiguration complete messages sent by all terminal devices are included in one uplink RRC message transmission message, and the RRC reconfiguration complete messages sent by all IAB child nodes are included in one different uplink RRC message transmission message; or An RRC reconfiguration completion message sent by a terminal device or an IAB child node served by one IAB node is included in one uplink RRC message transmission message, and an RRC reconfiguration completion message sent by a terminal device or an IAB child node served by another IAB node is included in one different uplink RRC message transmission message; or A method in which an RRC reconfiguration completion message transmitted by a terminal device served by one IAB node is included in one uplink RRC message transmission message, and an RRC reconfiguration completion message transmitted by an IAB child node served by this IAB node is included in one different uplink RRC message transmission message.

[0429] (Appendix 29) A method according to any one of claims 1-28, comprising: The RRC reconfiguration completion message includes a first RRC reconfiguration completion message and a second RRC reconfiguration completion message, the first RRC reconfiguration completion message is an RRC reconfiguration completion message generated by a first terminal device and / or a first child IAB node served by the first IAB node, and the second RRC reconfiguration completion message is an RRC reconfiguration completion message generated by a second terminal device and / or a second child IAB node served by the first IAB node; A method comprising: transmitting a first uplink message including the first RRC reconfiguration completion message to a target IAB donor node via a target route of the first IAB node; and the first IAB node transmitting a second uplink message including the second RRC reconfiguration completion message to a source IAB donor node; and transmitting the second RRC reconfiguration completion message to a target IAB donor node by the source IAB donor node.

[0430] (Appendix 30) A method for migrating an IAB node, the method being applied to a first IAB donor node, the first IAB donor node being a source IAB donor node of the first IAB node; The method comprises: receiving a second uplink message from a first IAB node, the second uplink message including an RRC reconfiguration complete message for a terminal device and / or a child IAB node served by the first IAB node; and sending the RRC reconfiguration complete message to a target IAB donor node of the first IAB node.

[0431] (Appendix 31) 31. The method of claim 30, sending the RRC reconfiguration complete message to a target IAB donor node of the first IAB node; and transmitting the RRC reconfiguration complete message to a target IAB donor node via an Xn interface or an NG interface.

[0432] (Appendix 32) 32. The method according to claim 30 or 31, the second uplink message includes third instruction information; The third instruction information is used by the source IAB donor node to send the RRC reconfiguration complete message to the target IAB donor node.

[0433] (Appendix 33) A method according to any one of claims 30-32, comprising: The second uplink message is a third F1 message.

[0434] (Appendix 34) A method according to any one of claims 30-33, comprising: The third F1 message is at least one of a terminal device context establishment response message and a terminal device context modification response message; or The third F1 message is an uplink RRC message transmission message.

[0435] (Appendix 35) 35. The method according to claim 34, The RRC reconfiguration completion message of the terminal device corresponding to the terminal device context establishment response message or the terminal device context modification response message is included in the terminal device context establishment response message or the terminal device context modification response message; or A method in which the terminal device context establishment response message or the terminal device context modification response message includes at least one of the RRC reconfiguration completion messages, and for one of the at least one RRC reconfiguration completion messages, a terminal device transmitting this RRC reconfiguration completion message is the same as or different from a terminal associated with the terminal device context establishment response message or the terminal device context modification response message.

[0436] (Appendix 36) 35. The method according to claim 34, All RRC reconfiguration complete messages are contained in one uplink RRC message transmission message; or The RRC reconfiguration complete messages sent by all terminal devices are included in one uplink RRC message transmission message, and the RRC reconfiguration complete messages sent by all IAB child nodes are included in one different uplink RRC message transmission message; or An RRC reconfiguration completion message sent by a terminal device or an IAB child node served by one IAB node is included in one uplink RRC message transmission message, and an RRC reconfiguration completion message sent by a terminal device or an IAB child node served by another IAB node is included in one different uplink RRC message transmission message; or A method in which an RRC reconfiguration completion message transmitted by a terminal device served by one IAB node is included in one uplink RRC message transmission message, and an RRC reconfiguration completion message transmitted by an IAB child node served by this IAB node is included in one different uplink RRC message transmission message.

[0437] (Appendix 37) The method according to any one of claims 30-36, further comprising: The method includes transmitting a first downlink message to the first IAB node, the first downlink message including a first RRC reconfiguration message.

[0438] (Appendix 38) 31. The method of claim 30, The second uplink message is also a feedback message of the first downlink message; or The method further comprises receiving a feedback message for the first downlink message.

[0439] (Appendix 39) A method for migrating an IAB node, the method being applied to a first IAB donor node, the first IAB donor node being a source IAB donor node of the first IAB node; The method comprises: receiving a feedback message of a first downlink message including a first RRC reconfiguration message from the first IAB node; and A method comprising: sending a second downlink message to a source parent IAB node of the first IAB node, the second downlink message including a second RRC reconfiguration message.

[0440] (Appendix 40) 39. The method of claim 39, The method includes, when the first IAB donor node receives feedback of a first RRC reconfiguration message from the first IAB node, sending a second downlink message to a source parent IAB node of the first IAB node, the second downlink message including a second RRC reconfiguration message.

[0441] (Appendix 41) The method according to claim 39 or 40, further comprising: A method comprising: transmitting the first downlink message to the first IAB node, the first downlink message including the first RRC reconfiguration message.

[0442] (Appendix 42) A method according to any one of claims 39-41, comprising: The method, wherein the first RRC reconfiguration message includes a key configured by a target IAB donor node of the first IAB node.

[0443] (Appendix 43) A method according to any one of claims 39-42, comprising: The method, wherein the first downlink message is a second F1 message.

[0444] (Appendix 44) A method according to any one of claims 39-42, comprising: The first downlink message includes at least one of the following: second instruction information, the second instruction information being used for instructing to perform migration of an IAB node of a cross CU or for instructing a terminal device setting to be performed for migration of an IAB node of a cross CU; a value of a first timer or a second timer, the first timer or the second timer being used for at least one of: the first IAB node initiating a random access procedure with a target parent IAB node, a distributed unit of the first IAB node establishing an F1 interface with a central unit of the target IAB donor node, and the first IAB node sending a feedback of a first RRC reconfiguration message to the source IAB donor node; and A method, wherein the number and / or ratio of at least one of terminal devices, child IAB nodes, messages, and feedback.

[0445] (Appendix 45) A method for migrating an IAB node, the method being applied to a second IAB donor node, the second IAB donor node being a target IAB donor node of a first IAB node; The method comprises: receiving a first uplink message, including an RRC reconfiguration complete message, sent by the first IAB node via a target route; and / or receiving an Xn message or an NG message from a source IAB donor node, the Xn message including an RRC reconfiguration complete message; A method in which the RRC reconfiguration complete message is an RRC reconfiguration complete message of a terminal device and / or a child IAB node served by the first IAB node.

[0446] (Appendix 46) 46. ​​The method of claim 45, The method, wherein the target path is an F1 interface between a distributed unit of the first IAB node and a central unit of the target IAB donor node.

[0447] (Appendix 47) 46. ​​The method of claim 45, A method in which the RRC reconfiguration complete message of the source IAB donor node is sent via an Xn interface or an NG interface.

Claims

1. A migration device applied to a first IAB donor node, comprising: the first IAB donor node is a source IAB donor node of the first IAB node; The migration device includes: a first transmitter for transmitting a first downlink message including a first RRC reconfiguration message to the first IAB node; a receiver for receiving a second uplink message transmitted from the first IAB node, the second uplink message being a UL RRC Message Transfer and including an RRC Reconfiguration Complete message of a descendant IAB node served by the first IAB node; and a second transmitter for transmitting a second downlink message to a source parent IAB node of the first IAB node, the second downlink message being a UE Context Modification Request message and including a second RRC reconfiguration message.

2. The migration device according to claim 1 , When the receiving unit receives the feedback message, the second transmitting unit transmits the second downlink message to the source parent IAB node of the first IAB node.

3. A migration device applied to a first IAB node, A receiving unit for receiving an RRC reconfiguration completion message of a terminal device and / or a descendant IAB node served by the first IAB node; and A transmitter for transmitting a first uplink message including the RRC reconfiguration complete message to a target IAB donor node via a target path, or for transmitting the RRC reconfiguration complete message to a target IAB donor node via a source IAB donor node; The migration device includes: a memory for storing the RRC reconfiguration complete message; and a processor for establishing the target path; the transmitting unit is used for transmitting the first uplink message to a target IAB donor node via the target route; A migration device, wherein the transmitting unit is used for transmitting a feedback message of the first downlink message to the source IAB donor node when a second condition is satisfied.

4. The migration device according to claim 3, A migration device, wherein the processor is used to discontinue traffic with the terminal device and / or the child IAB node when a first condition is satisfied.

5. The migration device according to claim 4, The first condition is: The first IAB node transmits an RRC reconfiguration message to all terminal devices and / or child IAB nodes that it serves, or receives an RRC reconfiguration completion message from all terminal devices and / or child IAB nodes that it serves; The first timer has expired; The number of terminal devices and / or child IAB nodes that have transmitted an RRC reconfiguration message by the first IAB node, or that have received a feedback message for an RRC reconfiguration message by the first IAB node, or that have received an RRC reconfiguration complete message by the first IAB node, has reached a first set value, and / or the ratio of terminal devices and / or child IAB nodes that have transmitted an RRC reconfiguration message by the first IAB node, or that have received a feedback message for an RRC reconfiguration message by the first IAB node, or that have received an RRC reconfiguration complete message by the first IAB node, has reached a first ratio; and The number of RRC reconfiguration messages transmitted by the first IAB node to a terminal device and / or a child IAB node served by the first IAB node, or the number of feedback messages of RRC reconfiguration messages of the terminal device and / or the child IAB node served by the first IAB node received, or the number of RRC reconfiguration completion messages of the terminal device and / or the child IAB node served by the first IAB node received, has reached a second set value; and / or the ratio of RRC reconfiguration messages transmitted by the first IAB node to the terminal device and / or the child IAB node served by the first IAB node, or the ratio of feedback messages of RRC reconfiguration messages of the terminal device and / or the child IAB node served by the first IAB node received, or the ratio of RRC reconfiguration completion messages of the terminal device and / or the child IAB node served by the first IAB node received, has reached a second ratio. A migration device including at least one of the following conditions.

6. The migration device according to claim 3, The second condition is: The first IAB node transmits an RRC reconfiguration message to all terminal devices and / or child IAB nodes that it serves, or receives an RRC reconfiguration completion message from all terminal devices and / or child IAB nodes that it serves; The second timer has expired; The number of terminal devices and / or child IAB nodes that have transmitted an RRC reconfiguration message by the first IAB node, or that have received a feedback message for an RRC reconfiguration message by the first IAB node, or that have received an RRC reconfiguration completion message by the first IAB node, reaches a third set value, and / or the ratio of terminal devices and / or child IAB nodes that have transmitted an RRC reconfiguration message by the first IAB node, or that have received a feedback message for an RRC reconfiguration message by the first IAB node, or that have received an RRC reconfiguration completion message by the first IAB node, reaches a third ratio; and the number of RRC reconfiguration messages transmitted by the first IAB node to a terminal device and / or a child IAB node served by the first IAB node, or the number of feedback messages of RRC reconfiguration messages of the terminal device and / or the child IAB node served by the first IAB node received, or the number of RRC reconfiguration completion messages of the terminal device and / or the child IAB node served by the first IAB node received, has reached a fourth set value; and / or the ratio of RRC reconfiguration messages transmitted by the first IAB node to the terminal device and / or the child IAB node served by the first IAB node, or the ratio of feedback messages of RRC reconfiguration messages of the terminal device and / or the child IAB node served by the first IAB node received, or the ratio of RRC reconfiguration completion messages of the terminal device and / or the child IAB node served by the first IAB node received, has reached a fourth ratio. A migration device including at least one of the following conditions.

7. The migration device according to claim 3, the receiving unit is used for receiving first instruction information, A migration device, wherein the first instruction information is used to indicate that the RRC reconfiguration completion message is an RRC reconfiguration completion message protected by a security setting configured by a target IAB donor node, or to indicate that the RRC reconfiguration completion message is to be sent to the target IAB donor node, or to indicate that the first IAB node stores the RRC reconfiguration completion message.

8. The migration device according to claim 7, The first indication information is included in an RLC unit header or a MAC unit header.

9. The migration device according to claim 7, The memory is used by a MAC layer, an RLC layer, or a BAP layer of a distributed unit (DU) of the first IAB node to store the RRC reconfiguration complete message.

10. The migration device according to claim 3, The migration apparatus, wherein the target path is an F1 interface between a distribution unit (DU) of the first IAB node and a central unit (CU) of the target IAB donor node.

11. The migration device according to claim 3, the receiver is used to receive a first downlink message from a source IAB donor node; The first downlink message includes a first RRC reconfiguration message, and the first RRC reconfiguration message includes a key configured by the target IAB donor node.

12. The migration device according to claim 11, The first downlink message: Second instruction information, the second instruction information being used to instruct migration of an IAB node of a cross CU or to instruct a terminal device setting to be performed for migration of an IAB node of a cross CU; a value of a first timer or a second timer, the first timer or the second timer being used by the first IAB node to at least one of initiate a random access procedure with a target parent IAB node, a distributed unit of the first IAB node to establish an F1 interface with a central unit of the target IAB donor node, and the first IAB node to send a feedback of a first RRC reconfiguration message to the source IAB donor node; and Number and / or ratio of at least one of terminal devices, child IAB nodes, messages, and feedback A migration device comprising at least one of the following:

13. The migration device according to claim 3, the transmitting unit is further adapted to transmit a second uplink message, including the RRC reconfiguration complete message, to a source IAB donor node; The RRC reconfiguration complete message is sent from the source IAB donor node to the target IAB donor node.

14. The migration device according to claim 13, The RRC reconfiguration complete message is sent by the source IAB donor node to the target IAB donor node via an Xn interface or an NG interface.

15. The migration device according to claim 13, the second uplink message includes third instruction information; The third instruction information is used by the source IAB donor node to send the RRC reconfiguration complete message to the target IAB donor node.

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