Method and apparatus for transplanting iab node

Abstract

A method and apparatus for migration of an IAB node. The method is applied to a first terminal device, the first terminal device including a terminal device served by a first IAB node and / or a terminal device served by a child IAB node of the first IAB node, and the method includes: storing first configuration information, the first configuration information including a security configuration configured by a target IAB donor node; and when first indication information is obtained, or when the security configuration in the stored first configuration information includes a security configuration corresponding to a selected or reselected cell, applying the security configuration in the stored first configuration information.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of communications. BACKGROUND

[0002] Integrated access and backhaul (IAB) ensures wireless relaying in NG-RAN. A relay node, i.e. IAB-node, supports NR access and backhauling. Backhauling can include single hop or multi-hop. The endpoint of the network side NR backhauling, i.e. IAB-donor, represents a gNB including additional functionalities to support IAB. The IAB-donor can also be referred to as IAB-donor node.

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

[0004] The IAB-node is connected to one IAB-donor through one or multiple hops. In the topology, this IAB-donor is the root node, the neighboring node on the IAB-DU interface of the IAB-node is referred to as a descendant node, i.e. descendant IAB-node, and the neighboring node on the IAB-MT interface is referred to as a parent node, i.e. parent IAB-node.

[0005] It should be noted that the above introduction to the technical background is only for convenience, and is described for the purpose of clearly and completely describing the technical solutions of the present application, and for the purpose of facilitating the understanding of those skilled in the art. The above technical solutions cannot be considered as known to those skilled in the art merely because they are described in the background section of the present application. SUMMARY

[0006] In some cases, migration of an IAB node is needed. Migration of an IAB node can also be referred to as topology adaptation of an IAB node. For example, an IAB node decides to migrate from an original path, referred to as a source path, to a new path, referred to as a target path, after measuring the link quality. The IAB node that performs the migration is referred to as a migrating IAB node.

[0007] Migration or topology adaptation scenarios of an IAB node can include intra-IAB-donor-CU and inter-IAB-donor-CU migration or topology adaptation.

[0008] For intra-IAB-donor-CU migration or topology adaptation scenarios of an IAB node, the source parent IAB node and the target parent IAB node are both served by the same IAB-donor-CU. The target parent IAB node can use a different IAB-donor-DU than the source parent IAB node; the source path and the target path can have common nodes.

[0009] Rel-17 elAB supports inter-CU IAB migration. For inter-IAB-donor-CU migration or topology adaptation scenarios of an IAB node, the source parent IAB node and the target parent IAB node are served by different IAB-donor-CUs. The target parent IAB node uses a different IAB-donor-DU than the source parent IAB node.

[0010] For inter-IAB-donor-CU migration / topology adaptation scenarios of an IAB node, the migration or topology adaptation procedure or mechanism allows migration of all or part of the IAB nodes, i.e., child IAB nodes and / or terminal devices, directly or indirectly served by the migrating IAB node; assuming that the parent-child node relationships, including IAB nodes and terminal devices, are unchanged at the new IAB-donor-CU.

[0011] Inter-IAB-donor-CU migration or topology adaptation procedures of an IAB node involve the following three stages: (1) migration of the IAB-MT of the migrating IAB node; (2) migration of the IAB-DU within the migrating IAB node; and (3) migration of the IAB-MTs of the terminal devices served by the migrating IAB node and the child IAB nodes served by the migrating IAB node, i.e., child nodes.

[0012] The above three stages can be independent procedures, and there is no restriction on the execution order for stages (1)-(3).

[0013] The inventors find that in the prior art, the handover of the transplanted IAB node is completed first, that is, the transplanted IAB node first establishes a target path with a target IAB donor, and then the IAB-MT of a terminal device and / or a child IAB node served by the transplanted IAB node detects RLF and performs reestablishment with the transplanted IAB node or another IAB node, thereby completing the handover of the terminal device and / or the child IAB node.

[0014] Based on the prior art, during the period from the start of the inter-IAB-donor-CU transplanted or topology adaptation process of the transplanted IAB node until the completion of the reestablishment of the terminal device with the transplanted IAB node or another IAB node, the service of the terminal device is interrupted, thereby reducing the user experience.

[0015] Considering the IAB protocol stack, the PDCP entity is located in the IAB-donor-CU, which means that the transplanted process of the inter-CU IAB node needs to update the security key of the terminal device served by the transplanted IAB node or its child IAB node.

[0016] If a signaling procedure similar to the IAB-MT handover in the transplanted IAB node is used, and considering that the three stages of the inter-IAB-donor-CU transplanted or topology adaptation process of an IAB node are independent, the following problem exists: if stage (1), that is, the IAB-MT transplanted of the transplanted IAB node, is performed first, after the IAB-MT is handed over to the target path, the IAB-donor-CU uses a message (such as an RRC reconfiguration message) protected by the new key of the target IAB donor to configure the new key of the target IAB donor for the above-mentioned terminal device, then the terminal device cannot obtain the message through the old key of the source IAB donor, which may cause the integrity verification to fail, thereby triggering connection reestablishment.

[0017] In order to solve one or more of the above problems, the embodiments of the present application provide a transplanted method and device of an IAB node.

[0018] According to a first aspect of the embodiments of the present application, a transplanted device of an IAB node is provided, which is applied to a first terminal device, the first terminal device including a terminal device served by a first IAB node and / or a terminal device served by a child IAB node of the first IAB node, the device including: a first storage unit configured to store first configuration information, the first configuration information including a security configuration configured by a target IAB donor node; and a first application unit configured to apply the security configuration in the stored first configuration information when first indication information is obtained, or when the security configuration in the stored first configuration information includes a security configuration corresponding to a selected or reselected cell.

[0019] According to a second aspect of embodiments of the present application, a device for migrating an IAB node is provided, the device is applied to a first IAB node, and the device comprises: a first sending unit configured to send, to a terminal device served by the first IAB node and / or a child IAB node of the first IAB node, first configuration information, the first configuration information comprising security configuration configured by a target IAB donor node; and a second sending unit configured to send, to the terminal device and / or the child IAB node, first indication information, the first indication information being used to indicate that a first terminal device applies the security configuration in the first configuration information, the first terminal device comprising the terminal device served by the first IAB node and / or a terminal device served by the child IAB node of the first IAB node.

[0020] According to a third aspect of embodiments of the present application, a device for migrating an IAB node is provided, the device is applied to a first IAB donor node, the first IAB donor node being a source IAB donor node of a first IAB node, and the device comprises: a third sending unit configured to send, to the first IAB node, first configuration information, the first configuration information comprising security configuration configured by a target IAB donor node; and a fourth sending unit configured to send, to the target IAB donor node, third indication information, the third indication information being used to indicate that a first terminal device applies the security configuration in the first configuration information, the first terminal device comprising a terminal device served by the first IAB node and / or a terminal device served by a child IAB node of the first IAB node.

[0021] According to a fourth aspect of embodiments of the present application, a terminal device is provided, the terminal device comprising the device according to the first aspect of embodiments of the present application.

[0022] According to a fifth aspect of embodiments of the present application, a network device is provided, the network device comprising the device according to the second aspect or the third aspect of embodiments of the present application.

[0023] According to a sixth aspect of embodiments of the present application, a communication system is provided, the communication system comprising a first network device and a terminal device, the terminal device comprising the device according to the first aspect of embodiments of the present application, and the first network device comprising the device according to the third aspect of embodiments of the present application.

[0024] According to a seventh aspect of embodiments of the present application, a communication system is provided, the communication system comprising a first network device, a fourth network device, and a terminal device, the terminal device comprising the device according to the first aspect of embodiments of the present application, the first network device comprising the device according to the third aspect of embodiments of the present application, and the fourth network device being a target IAB donor node of a first IAB node.

[0025] According to an eighth aspect of embodiments of the present application, a communication system is provided, the communication system comprising a first network device, a second network device, and a terminal device, the terminal device comprising the apparatus according to the first aspect of embodiments of the present application, the first network device comprising the apparatus according to the third aspect of embodiments of the present application, and the second network device comprising the apparatus according to the second aspect of embodiments of the present application.

[0026] According to a ninth aspect of embodiments of the present application, a communication system is provided, the communication system comprising a first network device, a second network device, a third network device, and a terminal device, the terminal device comprising the apparatus according to the first aspect of embodiments of the present application, the first network device comprising the apparatus according to the third aspect of embodiments of the present application, the second network device comprising the apparatus according to the second aspect of embodiments of the present application, the third network device being a child node of the first IAB node, and the terminal device being a terminal device served by the child node of the first IAB node.

[0027] According to a tenth aspect of embodiments of the present application, a communication system is provided, the communication system comprising a first network device, a second network device, a third network device, and a terminal device, the terminal device comprising the apparatus according to the first aspect of embodiments of the present application, the first network device comprising the apparatus according to the third aspect of embodiments of the present application, the second network device comprising the apparatus according to the second aspect of embodiments of the present application, the third network device being a child node of the first IAB node, and the terminal device being a terminal device served by the first IAB node.

[0028] According to an eleventh aspect of embodiments of the present application, a migration method of an IAB node is provided, the method being applied to a first terminal device, the first terminal device comprising a terminal device served by a first IAB node and / or a terminal device served by a child IAB node of the first IAB node, the method comprising: storing first configuration information, the first configuration information comprising a security configuration configured by a target IAB donor node; and when obtaining first indication information, or when the security configuration in the stored first configuration information comprises a security configuration corresponding to a selected or reselected cell, applying the security configuration in the stored first configuration information.

[0029] According to a twelfth aspect of the embodiments of the present application, a migration method of an IAB node is provided. The method is applied to a first IAB node. The method comprises: sending, to a terminal device served by the first IAB node and / or a child IAB node of the first IAB node, first configuration information, the first configuration information comprising security configuration configured by a target IAB donor node; and sending, to the terminal device and / or the child IAB node, first indication information, the first indication information being used to indicate that a first terminal device applies the security configuration in the first configuration information, the first terminal device comprising the terminal device served by the first IAB node and / or a terminal device served by the child IAB node of the first IAB node.

[0030] According to a thirteenth aspect of the embodiments of the present application, a migration method of an IAB node is provided. The method is applied to a first IAB donor node, the first IAB donor node being a source IAB donor node of a first IAB node. The method comprises: sending, to the first IAB node, first configuration information, the first configuration information comprising security configuration configured by a target IAB donor node; and sending, to the target IAB donor node, third indication information, the third indication information being used to indicate that a first terminal device applies the security configuration in the first configuration information, the first terminal device comprising a terminal device served by the first IAB node and / or a terminal device served by a child IAB node of the first IAB node.

[0031] According to a fourteenth aspect of the embodiments of the present application, a computer readable program is provided. When the program is executed in a migration device of an IAB node or a terminal device, the program causes the migration device of the IAB node or the terminal device to perform the migration method of the IAB node according to the seventh aspect of the embodiments of the present application.

[0032] According to a fifteenth aspect of the embodiments of the present application, a storage medium storing a computer readable program is provided. The computer readable program causes a migration device of an IAB node or a terminal device to perform the migration method of the IAB node according to the seventh aspect of the embodiments of the present application.

[0033] According to a sixteenth aspect of the embodiments of the present application, a computer readable program is provided. When the program is executed in a migration device of an IAB node or a network device, the program causes the migration device of the IAB node or the network device to perform the migration method of the IAB node according to the eighth aspect or the ninth aspect of the embodiments of the present application.

[0034] According to a seventeenth aspect of the embodiments of the present application, a storage medium storing a computer readable program is provided, wherein the computer readable program causes the migration device of the IAB node or the network device to perform the migration method of the IAB node according to the eighth aspect or the ninth aspect of the embodiments of the present application.

[0035] One of the beneficial effects of the embodiments of the present application is that when the first indication information is obtained, or when the security configuration in the stored first configuration information includes the security configuration corresponding to the selected or reselected cell, the terminal device applies the security configuration in the stored first configuration information, so that the terminal device can apply the correct security configuration, and the service interruption of the terminal device is reduced.

[0036] With reference to the following description and drawings, specific embodiments of the present application are disclosed in detail, indicating the ways in which the principles of the present application can be employed. It should be understood that the embodiments of the present application are not limited in scope so as to encompass many changes, modifications and equivalents within the spirit and scope of the appended claims. Embodiments of the present application include all technical, structural, and functional equivalents that operate like or function substantially the same as the disclosed embodiments to achieve the same or similar technical result in substantially the same way but not necessarily the same way.

[0037] Features described and / or illustrated with respect to one implementation can be used in one or more other implementations in the same or similar way, in combination with or in place of features in other implementations.

[0038] It should be emphasized that the term "comprises / comprising" when used in this specification is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps, components or groups thereof. BRIEF DESCRIPTION OF DRAWINGS

[0039] Elements and features of the embodiments of the application described in one or more figures or embodiments can be combined with elements and features illustrated in one or more other figures or embodiments. Additionally, in the drawings, like reference numerals indicate corresponding parts throughout the several views, and can be used to indicate corresponding parts in more than one embodiment.

[0040] The accompanying drawings, which are included to provide a further understanding of the embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings:

[0041] Figure 1 is a schematic diagram of the overall architecture of the IAB according to the embodiments of the present application;

[0042] Figure 2Figure 2 is another schematic diagram of the overall architecture of the IAB of the embodiments of the present application;

[0043] Figure 3 Figure 3 is a schematic diagram of the protocol stack of the Fl-U interface between the IAB-DU and the IAB-donor-CU;

[0044] Figure 4 Figure 4 is a schematic diagram of the protocol stack of the Fl-C interface between the IAB-DU and the IAB-donor-CU;

[0045] Figure 5 Figure 5 is a schematic diagram of the protocol stack of the SRB between the IAB-MT and the IAB-donor-CU of the embodiments of the present application;

[0046] Figure 6 Figure 6 is a schematic diagram of the scenario of the transplantation or topology adaptation of one IAB node within the IAB-donor-CU of the embodiments of the present application;

[0047] Figure 7 Figure 7 is a schematic diagram of the scenario of the transplantation or topology adaptation of one IAB node between the IAB-donor-CUs of the embodiments of the present application;

[0048] Figure 8 Figure 8 is a schematic diagram of the signaling flow of the transplantation or topology adaptation of one existing IAB node between the IAB-donor-CUs;

[0049] Figure 9 Figure 9 is a schematic diagram of the transplantation method of the IAB node of the embodiment 1 of the present application;

[0050] Figure 10 Figure 10 is a schematic diagram of the transplantation method of the IAB node of the embodiment 1 of the present application;

[0051] Figure 11 Figure 11 is a schematic diagram of the transplantation method of the IAB node of the embodiment 2 of the present application;

[0052] Figure 12 Figure 12 is a schematic diagram of the transplantation method of the IAB node of the embodiment 3 of the present application;

[0053] Figure 13 Figure 13 is a schematic diagram of the transplantation method of the IAB node of the embodiment 4 of the present application;

[0054] Figure 14 Figure 14 is a schematic diagram of the transplantation method of the IAB node of the embodiment 5 of the present application;

[0055] Figure 15 Figure 15 is a schematic diagram of the transplantation method of the IAB node of the embodiment 6 of the present application;

[0056] Figure 16is a schematic diagram of a migration apparatus of an IAB node of Embodiment 7 of the present application;

[0057] Figure 17 is another schematic diagram of a migration apparatus of an IAB node of Embodiment 7 of the present application;

[0058] Figure 18 is a schematic diagram of a migration apparatus of an IAB node of Embodiment 8 of the present application;

[0059] Figure 19 is a schematic diagram of a migration apparatus of an IAB node of Embodiment 9 of the present application;

[0060] Figure 20 is a schematic block diagram of a system configuration of a terminal device of Embodiment 10 of the present application;

[0061] Figure 21 is a schematic block diagram of a system configuration of a network device of Embodiment 11 of the present application;

[0062] Figure 22 is a schematic block diagram of a system configuration of a network device of Embodiment 12 of the present application;

[0063] Figure 23 is a schematic diagram of a communication system of Embodiment 13 of the present application;

[0064] Figure 24 is another schematic diagram of a communication system of Embodiment 13 of the present application;

[0065] Figure 25 is another schematic diagram of a communication system of Embodiment 13 of the present application;

[0066] Figure 26 is another schematic diagram of a communication system of Embodiment 13 of the present application;

[0067] Figure 27 is another schematic diagram of a communication system of Embodiment 13 of the present application;

[0068] Figure 28 is another schematic diagram of a communication system of Embodiment 13 of the present application;

[0069] Figure 29 is another schematic diagram of a communication system of Embodiment 13 of the present application;

[0070] Figure 30 is another schematic diagram of a communication system of Embodiment 13 of the present application. DETAILED DESCRIPTION

[0071] The foregoing and other features of the present application will become apparent to those skilled in the art upon consideration of the following description of the application taken in conjunction with the accompanying drawings. In the description of the application and the drawings, specific embodiments of the application are disclosed in order to provide a thorough understanding of the application. It should be understood that the application is not limited to the described embodiments, but rather the application includes all modifications, variations, and equivalents that fall within the scope of the appended claims.

[0072] In the embodiments of the present application, the terms "first", "second" and the like are used to distinguish different elements from one another, but do not indicate spatial or temporal order or the like, and these elements should not be limited by these terms. The term "and / or" includes any one and all combinations of the associated listed terms. The terms "comprise", "include", "have" and the like mean the presence of the stated feature, element, component or assembly, but do not exclude the presence or addition of one or more other features, elements, components or assemblies.

[0073] In the embodiments of the present application, the singular forms "a", "an" and "the" include plural forms, should be broadly understood as "one" or "one kind" rather than the meaning of "one", and in addition, the term "said" should be understood as including both singular and plural forms, unless the context clearly indicates otherwise. In addition, the term "according to" should be understood as "at least partially according to", and the term "based on" should be understood as "at least partially based on", unless the context clearly indicates otherwise.

[0074] In the embodiments of the present application, the term "communication network" or "wireless communication network" can refer to a network that conforms 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), and the like.

[0075] In addition, the communication between devices in the communication system can be carried out according to any stage of the communication protocol, which can include but is 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 the like, and / or other currently known or to be developed in the future communication protocols.

[0076] In the embodiments of the present application, the term "network device" refers to, for example, a device that accesses a communication network and provides services for a user equipment in a communication system. The network device can include, but is not limited to, the following devices: "node" and / or "donor" under the IAB architecture, base station (BS), access point (AP), transmission reception point (TRP), broadcast transmitter, mobile management entity (MME), gateway, server, radio network controller (RNC), base station controller (BSC), and the like.

[0077] The base station can include, but is not limited to, the following devices: Node B (Node B or NB), evolved Node B (eNode B or eNB), and 5G base station (gNB), and the like, and can also include remote radio head (RRH), remote radio unit (RRU), relay, or low-power node (such as femto, pico, and the like). The term "base station" can include some or all functions thereof, and each base station can provide communication coverage for a specific geographic area. The term "cell" can refer to a base station and / or its coverage area, depending on the context in which the term is used.

[0078] In the embodiments of the present application, the term "user equipment" (UE) refers to, for example, a device that accesses a communication network and receives network services through a network device, which can also be referred to as "terminal equipment" (TE). The terminal equipment can be fixed or mobile, and can also be referred to as a mobile station (MS), a terminal, a subscriber station (SS), an access terminal (AT), a station, and the like. For example, the terminal equipment served by the IAB node or the IAB donor under the IAB architecture.

[0079] The terminal equipment can include, but is not limited to, the following devices: cellular phone, personal digital assistant (PDA), wireless modem, wireless communication device, handheld device, machine type communication device, laptop computer, cordless phone, smart phone, smart watch, digital camera, and the like.

[0080] For another example, in scenarios such as Internet of Things (IoT), a terminal device can also be a machine or device that performs monitoring or measurement, for example, can include but is not limited to: a machine type communication (MTC) terminal, a vehicle-mounted communication terminal, a device to device (D2D) terminal, a machine to machine (M2M) terminal, and the like.

[0081] In the embodiments of the present application, "when", "in the case of", "for the case of" and "if" all represent based on a certain condition or state, and in addition, these expressions can be replaced with each other.

[0082] The scenarios of the embodiments of the present application are described below by examples, but the present application is not limited thereto.

[0083] Figure 1 is a schematic diagram of the IAB overall architecture of the embodiments of the present application. As shown in Figure 1 , the IAB overall architecture uses a duplex (SA) mode; Figure 2 is another schematic diagram of the IAB overall architecture of the embodiments of the present application. As shown in Figure 2 , the IAB overall architecture uses a dual connectivity (EN-DC) mode. In the dual connectivity mode, the IAB node is connected to one MeNB through E-UTRA, and the IAB donor acts as an SgNB to terminate X2-C.

[0084] Figure 3 is a schematic diagram of the protocol stack of the F1-U interface between the IAB-DU and the IAB-donor-CU, Figure 4 is a schematic diagram of the protocol stack of the F1-C interface between the IAB-DU and the IAB-donor-CU, in Figure 3 and Figure 4 , the F1-U and the F1-C are described by taking 2-hop backhaul as an example.

[0085] In the embodiments of the present application, the F1-U and the F1-C use the IP transport layer between the IAB-DU and the IAB-donor-CU, and in addition, the F1-U and the F1-C have security protection

[0086] In embodiments of the application, on wireless backhaul, IP layer is transported over a Backhaul Adaptation Protocol (BAP) sublayer to ensure multi-hop routing; IP layer can also be used for non-F1 traffic, such as Operation Administration and Maintenance (OAM) traffic.

[0087] In embodiments of the application, on each backhaul link, BAP PDUs are transported by BH RLC channels; multiple BH RLC channels can be configured on each BH link, which allows traffic prioritization and QoS (Quality of Service) enforcement.

[0088] In embodiments of the application, the BAP entity on each IAB node and IAB-donor-DU performs mapping of BH RLC channels for BAP PDUs.

[0089] In embodiments of the application, the IAB-MT establishes SRBs with the IAB-donor-CU for carrying RRC and NAS. Figure 5 is a schematic diagram of the protocol stack for inter-IAB-MT and IAB-donor-CU SRBs in embodiments of the application.

[0090] In embodiments of the application, for an IAB node operating in EN-DC mode, the IAB-MT also establishes one or more DRBs with the IAB-donor-CU, which can be used to transport, for example, OAM traffic. For SA mode, the establishment of DRBs is optional. These SRBs and DRBs are transported over the Uu interface between this IAB-MT and its parent node.

[0091] Figure 6 is a schematic diagram of a scenario of IAB-node migration or topology adaptation within an IAB-donor-CU in embodiments of the application. As shown in Figure 6 IAB-node 5 is a migrating IAB node, IAB-node 3 is the source parent IAB node of IAB-node 5, IAB-node 4 is the target parent IAB node of IAB-node 5, IAB-node 3 and IAB-node 4 are connected to the same IAB-donor-CU and different IAB-donor-DUs. UE1 is a terminal device served by IAB-node 5, and IAB-node 6 is a child IAB node served by IAB-node 5.

[0092] Figure 7 is a schematic diagram of a scenario of inter-IAB-donor-CU migration or topology adaptation of one IAB node. As shown in Figure 7 , the IAB-node 5 is the migrating node, the IAB-node 3 is the source parent IAB node of the IAB-node 5, the IAB-node 4 is the target parent IAB node of the IAB-node 5, and the IAB-node 3 and the IAB-node 4 are connected to different IAB-donor-CUs and different IAB-donor-DUs. The UE1 is a terminal device served by the IAB-node 5, and the IAB-node 6 is a child IAB node served by the IAB-node 5.

[0093] Figure 8 is a schematic diagram of a signaling procedure of inter-IAB-donor-CU migration or topology adaptation of one IAB node. As shown in Figure 8 , for stage (1) of inter-IAB-donor-CU migration or topology adaptation of one IAB node, i.e., migration of the IAB-MT of the migrating IAB node, at least steps 7-15 in Figure 8 are included; for stage (2), i.e., migration of the IAB-DU within the migrating IAB node, at least steps A and B are included; for stage (3), i.e., migration of the IAB-MTs of the terminal devices served by the migrating IAB node and the child IAB node served by the migrating IAB node, i.e., the child node, at least steps 16-20 are included.

[0094] If stage (1) is performed first, i.e., steps 7-13 in Figure 8 , after the IAB-MT switches to the target path, the IAB-donor-CU configures the terminal device with the new key of the target IAB donor using a message (e.g., an RRC reconfiguration message) protected by the new key of the target IAB donor, and the terminal device cannot obtain the message through the old key of the source IAB donor, which may cause integrity verification failure, thereby triggering connection reestablishment.

[0095] Various embodiments of the present application will be described below with reference to the accompanying drawings. These embodiments are only exemplary and are not limiting of the present application.

[0096] Embodiment 1

[0097] The embodiments of the present application provide a migration method of an IAB node, which is applied to a first terminal device, the first terminal device including a terminal device served by a first IAB node and / or a terminal device served by a child IAB node of the first IAB node.

[0098] Figure 9 is a schematic diagram of a migration method of the IAB node of Embodiment 1 of the present application. As shown in the figure, the method comprises: Figure 9

[0099] Step 901: storing first configuration information, the first configuration information comprising a security configuration configured by a target IAB donor node; and

[0100] Step 902: when obtaining first indication information, or when the security configuration in the stored first configuration information comprises a security configuration corresponding to a selected or reselected cell, applying the security configuration in the stored first configuration information.

[0101] Thus, it can be ensured that the terminal device can apply the correct security configuration, and the service interruption of the terminal device can be reduced.

[0102] In the embodiments of the present application, the first IAB node is a migrated IAB node.

[0103] In the embodiments of the present application, the first terminal device comprises a terminal device served by the first IAB node and / or a terminal device served by a child IAB node of the first IAB node; the terminal device served by the first IAB node can be at least one terminal device, the child IAB node of the first IAB node can be at least one child node, and the terminal device served by the child IAB node of the first IAB node can be at least one terminal device.

[0104] In step 901, the first terminal device stores first configuration information, which, in the embodiments of the present application, can be included in a first RRC message.

[0105] In the embodiments of the present application, the first RRC message can be from the first IAB node, for example, the first IAB node sends the first RRC message to a terminal device served by the first IAB node, and / or the first IAB node sends the first RRC message to a child IAB node of the first IAB node, which then sends the first RRC message to a terminal device served by the child IAB node.

[0106] In the embodiments of the present application, for example, the first RRC message for carrying configuration information from the target IAB donor can be a migration configuration message, a security update message or an RRC reconfiguration message. The migration configuration message and the security update message are new messages, which can adopt other names, and the embodiments of the present application do not limit the name of the message comprising the first configuration information.

[0107] ​In an embodiment of the application, the first RRC message can further comprise second indication information, the second indication information being used to indicate that the first terminal device stores the first RRC message or part of the configuration in the first RRC message or the first configuration information comprising the security configuration. That is, the second indication information is used to indicate that the first terminal device stores the first RRC message or part of the configuration in the first RRC message or the first configuration information comprising the security configuration, instead of immediately applying the message or information.

[0108] In an embodiment of the application, the first configuration information comprises a security configuration configured by the target IAB-donor node.

[0109] In an embodiment of the application, the security configuration can comprise at least one of an encryption algorithm, a corresponding key, an integrity algorithm and a corresponding key.

[0110] In an embodiment of the application, the security configuration configured by the target IAB-donor node can be sent by the target IAB-donor node to the first IAB node via a source IAB-donor node.

[0111] In an embodiment of the application, the first configuration information can comprise at least one security configuration. For example, for the case that the first configuration information comprises at least two security configurations, it can correspond to a cell ID or an index.

[0112] For example, the security configuration in the first configuration information comprises a security configuration of one cell. For example, the security configuration in the first configuration information comprises at least one entry, the entry comprising a cell ID and a security configuration corresponding to the cell ID.

[0113] In an embodiment of the application, for example, the first configuration information can further comprise a condition for applying the stored security configuration in the first configuration information and / or a valid time and / or area of the entry.

[0114] For example, the condition for applying the stored security configuration in the first configuration information is that the indication for applying the security configuration is an explicit and / or implicit indication, and / or the indication for applying the security configuration comes from the first IAB node and / or from an IAB-donor node.

[0115] For example, if the condition is an explicit indication, then in step 902, the stored security configuration is applied only when the obtained first indication information is an explicit indication or the first indication information obtained is an explicit indication.

[0116] For another example, if the condition is that the indication comes from the first IAB node, then in step 902, the stored security configuration is applied only when the obtained first indication information is from the first IAB node or the indication obtained is from the first IAB node.

[0117] For example, the time for applying the security configuration in the stored first configuration information can be from when the terminal device receives the security configuration, with a configured time length as the valid time.

[0118] For example, the area for applying the security configuration in the stored first configuration information can be the cell identifier of the cell serving the terminal device, if the cell identifier of the serving cell is included in the configuration of the cell ID for determining the valid area, the terminal device considers this entry valid, otherwise, considers it invalid or removes it.

[0119] In step 902, when the first indication information is obtained, or when the security configuration in the stored first configuration information includes the security configuration corresponding to the selected or reselected cell, the security configuration in the stored first configuration information is applied.

[0120] In the embodiments of the present application, for example, when there is only one security configuration in the stored first configuration information, when the first indication information is obtained or the security configuration corresponding to the selected or reselected cell is the stored security configuration, the stored security configuration is applied.

[0121] When there are multiple security configurations in the stored first configuration information, a correspondence between the multiple security configurations and the cell identifier can be set, and the security configuration corresponding to the cell identifier indicated by the first indication information or the identifier of the selected or reselected cell is applied.

[0122] In addition, an index and a plurality of security configurations can also be set in correspondence, and the security configuration corresponding to the index indicated by the first indication information is applied.

[0123] Alternatively, the first indication information indicates an index, and the corresponding security configuration in the security configuration is applied in sequence, that is, there is no index explicitly indicating a security configuration in the security configuration, only the first index indicated is 0, the second index is 1, and so on.

[0124] First, the case of applying the security configuration according to the first indication information is described.

[0125] In the embodiments of the present application, the first indication information can be provided in an explicit or implicit manner.

[0126] In the embodiments of the present application, the first indication information can be provided by the first IAB node, or can also be provided by the source IAB donor node of the first IAB node.

[0127] In the embodiments of the present application, the source IAB donor node is also referred to as a source IAB donor, which represents the end point of backhaul on the source path at the network side; and the target IAB donor node is also referred to as a target IAB donor, which represents the end point of backhaul on the target path at the network side.

[0128] For example, the first indication information is provided by the first IAB node in an explicit manner. For example, the first indication information is provided by the IAB-DU of the first IAB node. For example, the first indication information is included in an L1 indication message or a MAC indication message.

[0129] For the case that the first indication information is included in the L1 indication message, the following is explained.

[0130] For example, the L1 indication message reuses a short message of a paging message. For example, 1 free bit in the short message is used to indicate the security configuration in the first configuration information to be applied for storage.

[0131] For example, the short message is composed of 8 bits, 6 bits of which are free, and 1 free bit of which is used to indicate the security configuration in the first configuration information to be applied for storage. For example, the value of the 1 free bit is 1, indicating that the security configuration in the first configuration information is to be applied for storage, and the value of the 1 free bit is 0, indicating that the security configuration in the first configuration information is not to be applied for storage or is considered invalid or removed.

[0132] For example, bit 4 or any one or more of bits 5-8 is used to indicate the security configuration in the first configuration information to be applied for storage.

[0133] For example, for the case of using an existing free bit for indication, if the bit is set to 1, it indicates that the security configuration in the first configuration information is to be applied for storage, and if the bit is set to 0, it indicates that the security configuration in the first configuration information is not to be applied for storage or is removed; other existing free bits are not used, and if received by the terminal, they will be ignored.

[0134] For example, for the case of using multiple bits for indication, one bit corresponds to one security configuration, and if one bit of the multiple bits is set to 1, it indicates that the security configuration corresponding to the bit is to be applied for storage, and if the bit is set to 0, it indicates that the security configuration corresponding to the bit is not to be applied for storage or is removed; other existing free bits are not used, and if received by the terminal, they will be ignored.

[0135] In addition, the name of the bit used for indication can be applyStoredConfig, which is an exemplary name, and the embodiments of the present application do not limit the specific name.

[0136] In the embodiments of the present application, when the short message is associated with a paging message, and the terminal device identifier is included in the paging message and the short message indicates that the security configuration in the first configuration information is to be applied for storage, the first terminal device applies the security configuration in the first configuration information for storage.

[0137] For example, the one or more existing free bits in the short message indicate the index of the security configuration in the first configuration information stored by the application; other existing free bits are not used and will be ignored by the terminal if received.

[0138] For example, the short message is composed of 8 bits, 6 of which are free, at least one of which is used to indicate the index of the security configuration in the first configuration information stored by the application.

[0139] For example, 2 bits are used for indication, which can control 4 indexes.

[0140] For example, the 2 bits indicate 00, indicating the security configuration with index = 0 or the first security configuration; indicate 01, indicating the security configuration with index = 1 or the second security configuration; indicate 10, indicating the security configuration with index = 2 or the third security configuration; indicate 11, indicating the security configuration with index = 3 or the fourth security configuration; other existing free bits are not used and will be ignored by the terminal if received.

[0141] For example, the 2 bits indicate 11, indicating the security configuration with index = 0 or the first security configuration; indicate 10, indicating the security configuration with index = 1 or the second security configuration; indicate 01, indicating the security configuration with index = 2 or the third security configuration; indicate 00, indicating the security configuration with index = 3 or the fourth security configuration; other existing free bits are not used and will be ignored by the terminal if received.

[0142] In the embodiments of the present application, when the short message is associated with a paging message, and the terminal device identifier is included in the paging message and the short message indicates the index of the security configuration in the first configuration information stored by the application, the first terminal device applies the security configuration corresponding to the index of the security configuration in the first configuration information stored by the application.

[0143] For the case where the first indication information is included in the MAC indication message, the following is explained.

[0144] For example, the MAC indication message indicates whether to apply the security configuration in the first configuration information stored by the application or indicates a cell identifier (ID) through a MAC CE.

[0145] For example, 1 bit in the MAC CE is used to indicate whether to apply the security configuration corresponding to the bit in the first configuration information stored by the application. For example, the bit can correspond to a security configuration explicitly or implicitly.

[0146] For example, for the case of explicit correspondence, the corresponding security configuration is determined according to the explicit index;

[0147] For example, for the case of implicit correspondence, the corresponding security configuration is determined according to the order in which the bit appears in the first configuration information.

[0148] For example, the value 1 of the bit indicates application, and the value 0 indicates non-application or removal.

[0149] For example, when the MAC CE includes a cell identity, the stored security configuration corresponding to the cell identity in the first configuration information is applied. For example, the cell identity is used to uniquely determine a cell in a public land mobile network (PLMN).

[0150] The above describes the case where the first indication information is provided by the first IAB node in an explicit manner. The following describes the case where the first indication information is provided by the source IAB donor node of the first IAB node in an explicit manner.

[0151] In the embodiments of the present application, the first indication information can be sent to the first terminal device by the source IAB donor node of the first IAB node through the target IAB donor node of the first IAB node and the first IAB node.

[0152] For example, the first indication information is sent by the source IAB donor node of the first IAB node to the target IAB donor node of the first IAB node through an Xn interface or an NG interface, and is sent by the target IAB donor node to the first IAB node through an F1 interface.

[0153] In the embodiments of the present application, the first indication information can be included in a system message or a terminal device-specific dedicated message.

[0154] For example, for the case where the first indication information is included in the system message, if the network device includes the first indication information in the system message, the first terminal device applies the stored security configuration in the first configuration information, otherwise, it does not apply; or, the network device includes a cell identity in the system message, and the first terminal device applies the corresponding security configuration of the stored security configuration in the first configuration information corresponding to the cell identity.

[0155] For example, the first indication information is included in a terminal device specific dedicated message, for example, an RRC reconfiguration message. For example, if the network device includes the first indication information in the RRC reconfiguration message, the first terminal device applies the security configuration in the stored first configuration information, otherwise, does not apply; or the network device includes a cell identity in the RRC reconfiguration message, then the first terminal device applies the security configuration corresponding to the cell identity in the security configuration in the stored first configuration information.

[0156] In addition, the first indication information can also be provided in an implicit manner. For example, the first indication information is provided in an implicit manner through the first terminal device detecting a cell identity change of a cell with the same physical cell identifier (PCI).

[0157] The above describes the case of applying the security configuration according to the first indication information. Next, the case of applying the security configuration according to the selected or reselected cell is described.

[0158] In the embodiments of the present application, for the case of applying the security configuration according to the selected or reselected cell, when the security configuration in the stored first configuration information includes the security configuration corresponding to the selected or reselected cell, the first terminal device applies the security configuration corresponding to the selected or reselected cell in the security configuration in the stored first configuration information.

[0159] Figure 10 is a schematic diagram of a migration method of an IAB node of Embodiment 1 of the present application. As shown in Figure 10 the method comprises:

[0160] Step 1001: store first configuration information, the first configuration information including a security configuration configured by a target IAB donor node;

[0161] Step 1002: perform integrity detection;

[0162] Step 1003: when integrity detection failure occurs, perform cell selection or reselection; and

[0163] Step 1004: according to the selected or reselected cell, perform connection reestablishment or apply the security configuration in the stored first configuration information.

[0164] In step 1004, when the security configuration in the stored first configuration information includes the security configuration corresponding to the selected or reselected cell, the first terminal device applies the security configuration corresponding to the selected or reselected cell in the security configuration in the stored first configuration information; and when the security configuration in the stored first configuration information does not include the security configuration corresponding to the selected or reselected cell, the first terminal device performs connection reestablishment.

[0165] In the embodiments of the present application, the selected or reselected cell is the same as the cell in which the integrity detection failure occurs or is a same-frequency cell.

[0166] In the embodiments of the present application, when the first configuration information is received and the first configuration information includes the security configuration of the first cell or the first cell identifier, and the integrity detection failure occurs on the first cell, the first terminal device does not consider that the cell or the frequency to which the cell belongs is prohibited, or the first terminal device takes the cell or a same-frequency cell as a candidate cell for cell selection or reselection.

[0167] In the embodiments of the present application, the first terminal device can send a first RRC reconfiguration complete message protected by the security configuration configured by the source IAB donor node; and / or send a second RRC reconfiguration complete message protected by the security configuration configured by the target IAB donor node.

[0168] As known from the above embodiments, when the first indication information is obtained, or when the security configuration in the stored first configuration information includes the security configuration corresponding to the selected or reselected cell, the terminal device applies the security configuration in the stored first configuration information, so that the terminal device can apply the correct security configuration and reduce the service interruption of the terminal device.

[0169] Embodiment 2

[0170] The embodiments of the present application provide a migration method of an IAB node, which is applied to a first IAB node. The method corresponds to Embodiment 1, and the same content can be referred to Embodiment 1.

[0171] In the embodiments of the present application, the first IAB node is a migrated IAB node.

[0172] Figure 11 is a schematic diagram of the migration method of the IAB node of Embodiment 2 of the present application. As shown in Figure 11 , the method comprises:

[0173] Step 1101: sending, to a terminal device served by the first IAB node and / or a child IAB node of the first IAB node, first configuration information, the first configuration information comprising a security configuration configured by a target IAB donor node; and

[0174] Step 1102: sending, to the terminal device and / or the child IAB node, first indication information, the first indication information being used to indicate that the first terminal device applies the security configuration in the first configuration information, the first terminal device comprising the terminal device served by the first IAB node and / or a terminal device served by the child IAB node of the first IAB node.

[0175] In an embodiment of the present application, the first indication information is provided by the first IAB node in an explicit manner.

[0176] In an embodiment of the present application, the first indication information can be included in an L1 indication message or a MAC indication message.

[0177] For example, the L1 indication message reuses a short message of a paging message.

[0178] For example, 1 free bit in the short message is used to indicate that the security configuration in the stored first configuration information is applied.

[0179] For example, when the short message is associated with a paging message, and a terminal device identity is included in the paging message and the short message indicates the index of the security configuration in the stored first configuration information, the first terminal device applies the security configuration corresponding to the index of the security configuration in the stored first configuration information.

[0180] For example, the free bit in the short message indicates the index of the security configuration in the stored first configuration information.

[0181] For example, when the short message is associated with a paging message, and a terminal device identity is included in the paging message and the short message indicates the index of the security configuration in the stored first configuration information, the first terminal device applies the security configuration corresponding to the index of the security configuration in the stored first configuration information.

[0182] For example, the MAC indication message indicates whether the security configuration in the stored first configuration information is applied or indicates a cell identity by means of a MAC CE.

[0183] For example, 1 bit in the MAC CE is used to indicate whether the security configuration in the stored first configuration information is applied.

[0184] For example, when the MAC CE includes a cell identity, the security configuration corresponding to the cell identity in the stored first configuration information is applied.

[0185] For example, the first indication information is provided in an implicit manner by changing the cell identity using the same physical cell identity (PCI).

[0186] In the embodiments of the present application, when a cell identity is configured by operation, administration and maintenance (OAM) or signaling, and the cell identity is different from the previous cell identity, the new cell identity is applied, and the application of the new cell identity includes that the system information and the RRC dedicated message include the new cell identity.

[0187] In the embodiments of the present application, for example, as shown in Figure 11 The method further includes:

[0188] Step 1103: receiving the first configuration information from the source IAB donor node of the first IAB node.

[0189] In the embodiments of the present application, the first configuration information can be included in a first RRC message.

[0190] For example, the first RRC message is a transplant configuration message, a security update message or an RRC reconfiguration message.

[0191] In the embodiments of the present application, the first RRC message can include second indication information, and the second indication information is used to instruct the terminal device and / or the terminal device served by the child IAB node of the first IAB node to store the first RRC message or part of the configuration in the first RRC message or the first configuration information including the security configuration.

[0192] In the embodiments of the present application, the security configuration in the first configuration information can include the security configuration of one cell.

[0193] In the embodiments of the present application, the security configuration in the first configuration information can include at least one entry, and the entry includes a cell identity and a security configuration corresponding to the cell identity.

[0194] In the embodiments of the present application, the first configuration information can further include a condition for applying the security configuration stored in the first configuration information and / or a valid time and / or area of the entry.

[0195] In the embodiments of the present application, the same content as that of Embodiment 1 can be referred to in Embodiment 1, which will not be repeated here.

[0196] As can be known from the above embodiments, when the first indication information is obtained, or when the security configuration in the stored first configuration information includes the security configuration corresponding to the selected or reselected cell, the terminal device applies the security configuration in the first configuration information stored by the terminal device, so that the terminal device can apply the correct security configuration, and the service interruption of the terminal device can be reduced.

[0197] Embodiment 3

[0198] The embodiments of the present application provide a migration method of an IAB node, which is applied to a first IAB donor node, the first IAB donor node being a source IAB donor node of a first IAB node. The method corresponds to Embodiment 1, and the same content can be referred to Embodiment 1.

[0199] Figure 12 is a schematic diagram of the migration method of the IAB node of Embodiment 3 of the present application. As shown in the figure, the method includes at least one of the following steps: Figure 12

[0200] Step 1201: sending first configuration information to the first IAB node, the first configuration information including a security configuration configured by a target IAB donor node; and

[0201] Step 1202: sending third indication information to the target IAB donor node, the third indication information being used to indicate that a first terminal device applies the security configuration in the first configuration information, the first terminal device including a terminal device served by the first IAB node and / or a terminal device served by a child IAB node of the first IAB node.

[0202] In the embodiments of the present application, the third indication information can be sent to the first terminal device by the source IAB donor node of the first IAB node through the target IAB donor node and the first IAB node.

[0203] For example, the third indication information is sent by the source IAB donor node of the first IAB node to the target IAB donor node through an Xn interface or an NG interface, and is sent by the target IAB donor node to the first IAB node through an F1 interface.

[0204] For example, the third indication information is included in a system message or a terminal device-specific dedicated message.

[0205] In the embodiments of the present application, when the network device includes an indication in the system message, the first terminal device applies the security configuration; or when the network device includes a cell ID in the system message, the first terminal device applies the configuration corresponding to the cell in the security configuration.

[0206] ​In step 1201, the first configuration information is sent to the first IAB node, for example, through an Xn interface or an NG interface.

[0207] In the embodiments of the present application, the first configuration information can be included in a first RRC message.

[0208] For example, the first RRC message is a transplant configuration message, a security update message or an RRC reconfiguration message.

[0209] In the embodiments of the present application, the first RRC message can include second indication information, which is used to indicate that the first terminal device stores the first RRC message or part of the configuration in the first RRC message or the first configuration information including the security configuration.

[0210] In the embodiments of the present application, the security configuration in the first configuration information can include the security configuration of one cell.

[0211] For example, the security configuration in the first configuration information includes at least one entry, which includes a cell identifier and a security configuration corresponding to the cell identifier.

[0212] In the embodiments of the present application, the first configuration information can further include conditions for applying the stored security configuration in the first configuration information and / or the validity time and / or area of the entry.

[0213] In this embodiment, the same content as in embodiment 1 can be referred to in embodiment 1, which will not be repeated here.

[0214] As can be seen from the above embodiments, when the first indication information is obtained, or when the security configuration in the stored first configuration information includes the security configuration corresponding to the selected or reselected cell, the terminal device applies the security configuration in the stored first configuration information, so that the terminal device can apply the correct security configuration and reduce the service interruption of the terminal device.

[0215] Embodiment 4

[0216] The embodiments of the present application provide a transplant method of an IAB node, which is applied to a first terminal device, a first IAB node and a first IAB donor node, the first IAB donor node being a source IAB donor node of the first IAB node. The method corresponds to embodiments 1 to 3, and the same content can be referred to in embodiments 1 to 3.

[0217] In the embodiments of the present application, the second IAB donor node is a target IAB donor node of the first IAB node, the second IAB node is a source parent IAB node of the first IAB node, and the third IAB node is a target parent IAB node of the first IAB node.

[0218] Figure 13 is a schematic diagram of a migration method of the IAB node of Embodiment 4 of the present application. As shown in the figure, the method comprises the following steps. Figure 13

[0219] Step 1301: The first IAB donor node sends a first downlink message comprising a first RRC reconfiguration message to the first IAB node, the first RRC reconfiguration message comprising first configuration information, the first configuration information comprising security configuration configured by the second IAB donor node;

[0220] Step 1302: The first IAB node sends a feedback message of the first downlink message to the first IAB donor node;

[0221] Step 1303: The first IAB node sends the first RRC reconfiguration message to the first terminal device;

[0222] Step 1304: The first terminal device sends a first RRC reconfiguration complete message to the first IAB node, the first RRC reconfiguration complete message being protected using the security configuration configured by the first IAB donor node;

[0223] Step 1305: The first terminal device stores the first configuration information;

[0224] Step 1306: The first IAB node is migrated from the first IAB donor node to the second IAB donor node;

[0225] Step 1307: The first IAB node sends a second RRC reconfiguration message to the first terminal device;

[0226] Step 1308: The first terminal device occurs an integrity detection failure; and

[0227] Step 1309: The security configuration in the stored first configuration information is applied according to the selected or reselected cell;

[0228] Step 1310: The first terminal device sends a second RRC reconfiguration complete message to the first IAB node, the second RRC reconfiguration complete message being protected using the security configuration configured by the second IAB donor node.

[0229] In the embodiments of the present application, steps 1304 and 1310 are optional steps.

[0230] In the embodiments of the present application, steps 1302 and 1303 are not limited in the order, and steps 1304 and 1305 are not limited in the order.

[0231] ​From the above embodiments, when the first terminal device receives data or messages from the first IAB node, since the data or messages use the new security configuration, i.e., the security configuration configured by the second IAB donor node, the first terminal device can fail in integrity check, thereby triggering cell reselection or selection. In this case, if the corresponding security configuration of the reselected or selected cell is already stored in the first terminal device, the first terminal device does not need to perform connection reestablishment, but applies the stored security configuration. In this way, it can be ensured that the terminal device can apply the correct security configuration, and the service interruption of the terminal device is reduced.

[0232] Embodiment 5

[0233] The embodiments of the present application provide a migration method of an IAB node, which is applied to a first terminal device, a first IAB node, and a first IAB donor node, the first IAB donor node being a source IAB donor node of the first IAB node. The method corresponds to embodiments 1 to 3, and the same content can be referred to the description in embodiments 1 to 3.

[0234] In the embodiments of the present application, the second IAB donor node is a target IAB donor node of the first IAB node, the second IAB node is a source parent IAB node of the first IAB node, and the third IAB node is a target parent IAB node of the first IAB node.

[0235] Figure 14 is a schematic diagram of the migration method of the IAB node of the embodiment 5 of the present application. As shown in Figure 14 , the method comprises:

[0236] Step 1401: The first IAB donor node sends a first downlink message comprising a first RRC reconfiguration message to the first IAB node, the first RRC reconfiguration message comprising first configuration information, the first configuration information comprising a security configuration configured by the second IAB donor node;

[0237] Step 1402: The first IAB node sends a feedback message of the first downlink message to the first IAB donor node;

[0238] Step 1403: The first IAB node sends the first RRC reconfiguration message to the first terminal device;

[0239] Step 1404: The first terminal device sends a first RRC reconfiguration complete message to the first IAB node, the first RRC reconfiguration complete message being protected by using the security configuration configured by the first IAB donor node;

[0240] Step 1405: The first terminal device stores the first configuration information;

[0241] Step 1406: The first IAB node is transplanted from the first IAB donor node to the second IAB donor node;

[0242] Step 1407: The first IAB donor node sends first indication information to the second IAB donor node through an Xn interface;

[0243] Step 1408: The second IAB donor node sends the first indication information to the first IAB node through an F1 interface;

[0244] Step 1409: The first IAB node sends a second RRC reconfiguration message including the first indication information to the first terminal device;

[0245] Step 1410: The first terminal device applies the security configuration in the stored first configuration information according to the first indication information;

[0246] Step 1411: The first terminal device sends a second RRC reconfiguration complete message to the first IAB node, and the second RRC reconfiguration complete message is protected by using the security configuration configured by the second IAB donor node.

[0247] In the embodiment of the application, steps 1404 and 1411 are optional steps.

[0248] In the embodiment of the application, steps 1402 and 1403 are not limited in sequence; and steps 1404 and 1405 are not limited in sequence.

[0249] As known from the above embodiment, after the transplantation or topology adaptation of the first IAB node across the IAB-donor-CU is completed, the first IAB donor node provides an indication for the first terminal device before releasing the terminal device context, and the indication is submitted to the first terminal device through the second IAB donor node. In this way, it can be ensured that the terminal device can apply the correct security configuration, and the service interruption of the terminal device is reduced.

[0250] Embodiment 6

[0251] The embodiment of the application provides a transplantation method of an IAB node, which is applied to a first terminal device, a first IAB node and 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 embodiments 1 to 3, and the same content can be referred to the description in embodiments 1 to 3.

[0252] In the embodiment of the application, the second IAB donor node is a target IAB donor node of the first IAB node, the second IAB node is a source parent IAB node of the first IAB node, and the third IAB node is a target parent IAB node of the first IAB node.

[0253] Figure 15 is a schematic diagram of a migration method of the IAB node of Embodiment 6 of the present application. As shown in the figure, the method comprises: Figure 15

[0254] Step 1501: The first IAB donor node sends a first downlink message comprising a first RRC reconfiguration message to the first IAB node, the first RRC reconfiguration message comprising first configuration information, the first configuration information comprising security configuration configured by the second IAB donor node;

[0255] Step 1502: The first IAB node sends a feedback message of the first downlink message to the first IAB donor node;

[0256] Step 1503: The first IAB node sends the first RRC reconfiguration message to the first terminal device;

[0257] Step 1504: The first terminal device sends a first RRC reconfiguration complete message to the first IAB node, the first RRC reconfiguration complete message being secured (encrypted and integrity protected) using the security configuration configured by the first IAB donor node;

[0258] Step 1505: The first terminal device stores the first configuration information;

[0259] Step 1506: The first IAB node migrates from the first IAB donor node to the second IAB donor node;

[0260] Step 1507: The first IAB node sends first indication information to the first terminal device;

[0261] Step 1508: The first terminal device applies the security configuration in the stored first configuration information according to the first indication information;

[0262] Step 1509: The first terminal device sends a second RRC reconfiguration complete message to the first IAB node, the second RRC reconfiguration complete message being secured using the security configuration configured by the second IAB donor node.

[0263] In the embodiments of the present application, steps 1504 and 1509 are optional steps.

[0264] In the embodiments of the present application, steps 1502 and 1503 are not limited in sequence; steps 1504 and 1505 are not limited in sequence.

[0265] ​From the above embodiments, after the migration or topology adaptation of the first IAB node across the IAB-donor-CUs is completed, the first IAB node provides an indication to the first terminal device to indicate the first terminal device to apply the security configuration in the stored first configuration information. In this way, it can be ensured that the terminal device can apply the correct security configuration, and the service interruption of the terminal device is reduced.

[0266] Embodiment 7

[0267] The embodiments of the present application provide a migration apparatus of an IAB node, which is applied to a first terminal device, the first terminal device including a terminal device served by a first IAB node and / or a terminal device served by a child IAB node of the first IAB node. Since the principle of solving the problem of the apparatus is similar to the method of Embodiment 1, the specific implementation thereof can refer to the implementation of the method described in Embodiment 1, and the same or related contents will not be described repeatedly.

[0268] Figure 16 is a schematic diagram of the migration apparatus of the IAB node of Embodiment 7 of the present application, as shown in Figure 16 The apparatus 1600 includes:

[0269] a first storage unit 1601 configured to store first configuration information, the first configuration information including a security configuration configured by a target IAB donor node; and

[0270] a first application unit 1602 configured to apply the security configuration in the stored first configuration information when first indication information is obtained, or when the security configuration in the stored first configuration information includes a security configuration corresponding to a selected or reselected cell.

[0271] In the embodiments of the present application, the first indication information is provided in an explicit or implicit manner.

[0272] For example, the first indication information is provided by the first IAB node in an explicit manner.

[0273] For example, the first indication information is included in an L1 indication message or a MAC indication message.

[0274] For example, the L1 indication message reuses a short message of a paging message.

[0275] For example, 1 idle bit in the short message is used to indicate the application of the security configuration in the stored first configuration information.

[0276] For example, the first application unit applies the security configuration in the stored first configuration information when the short message is associated with a paging message, and the terminal device identity is included in the paging message and the short message indicates to apply the security configuration in the stored first configuration information.

[0277] For example, a free bit in the short message indicates an index of the security configuration in the stored first configuration information.

[0278] For example, the first application unit applies the security configuration corresponding to the index of the security configuration in the stored first configuration information when the short message is associated with a paging message, and the terminal device identity is included in the paging message and the short message indicates to apply the index of the security configuration in the stored first configuration information.

[0279] For example, the MAC indication message indicates whether to apply the security configuration in the stored first configuration information or indicates a cell identity (ID) through a MAC CE.

[0280] For example, one bit in the MAC CE is used to indicate whether to apply the security configuration corresponding to the bit in the stored first configuration information.

[0281] In the embodiments of the present application, the first application unit 1602 applies the security configuration corresponding to the cell identity in the stored first configuration information when the MAC CE includes a cell identity.

[0282] For example, the first indication information is provided by the source IAB donor node of the first IAB node in an explicit manner.

[0283] For example, the first indication information is sent to the first terminal device by the source IAB donor node of the first IAB node through the target IAB donor node of the first IAB node.

[0284] For example, the first indication information is sent by the source IAB donor node of the first IAB node to the target IAB donor node of the first IAB node through an Xn interface or an NG interface, and is sent by the target IAB donor node to the first IAB node through an F1 interface.

[0285] For example, the first indication information is included in a system message or a terminal device-specific dedicated message.

[0286] For example, the first indication information is provided in an implicit manner by the first terminal device detecting a cell identity change of a same physical cell identity (PCI).

[0287] For example, the first configuration information is included in a first RRC message.

[0288] For example, the first RRC message comprises second indication information, the second indication information being used for indicating the first terminal device to store the first RRC message or part of the configuration in the first RRC message or the first configuration information comprising the security configuration.

[0289] For example, the first RRC message is a transplant configuration message, a security update message or an RRC reconfiguration message.

[0290] For example, the security configuration in the first configuration information comprises security configuration of one cell.

[0291] For example, the security configuration in the first configuration information comprises at least one entry, the entry comprising a cell identity and security configuration corresponding to the cell identity.

[0292] In the embodiments of the present application, the first configuration information further comprises conditions for applying the stored security configuration in the first configuration information and / or valid time and / or area of the entry.

[0293] Figure 17 is another schematic diagram of a transplant device of an IAB node according to Embodiment 7 of the present application, as shown in Figure 17 The device 1700 comprises:

[0294] a first storage unit 1701 configured to store first configuration information, the first configuration information comprising security configuration of a target IAB donor node;

[0295] a first detection unit 1702 configured to perform integrity detection;

[0296] a first selection unit 1703 configured to select or reselect a cell when integrity detection failure occurs; and

[0297] a first processing unit 1704 configured to perform connection reestablishment or apply the stored security configuration in the first configuration information according to the selected or reselected cell.

[0298] In the embodiments of the present application, the selected or reselected cell is the same as the cell where integrity detection failure occurs or is a same-frequency cell or a different-frequency cell.

[0299] For example, when the first configuration information is received and the first configuration information comprises security configuration of a first cell or a first cell identity, and integrity detection failure occurs on the first cell, the first terminal device does not consider that the cell or the frequency where the cell is located is prohibited, or the first terminal device takes the cell or a same-frequency cell as a candidate cell for cell selection or reselection.

[0300] In the embodiments of the present application, for example, as shown in Figure 16As shown, the apparatus 1600 further includes:

[0301] a fifth sending unit 1603, configured to send a first RRC reconfiguration complete message protected by a security configuration configured by a source IAB donor node; and / or,

[0302] a sixth sending unit 1604, configured to send a second RRC reconfiguration complete message protected by a security configuration configured by a target IAB donor node.

[0303] In the embodiments of the present application, for example, using a security configuration to protect an RRC message means that the RRC message is encrypted using the encryption algorithm and the corresponding key in the security configuration, and the RRC message is integrity protected using the integrity algorithm and the corresponding key in the security configuration.

[0304] Using a security configuration configured by a source IAB donor node to protect an RRC message means that the RRC message is encrypted using the encryption algorithm and the corresponding key in the security configuration configured by the source IAB donor node, and the RRC message is integrity protected using the integrity algorithm and the corresponding key in the security configuration configured by the source IAB donor node.

[0305] Using a security configuration configured by a target IAB donor node to protect an RRC message means that the RRC message is encrypted using the encryption algorithm and the corresponding key in the security configuration configured by the target IAB donor node, and the RRC message is integrity protected using the integrity algorithm and the corresponding key in the security configuration configured by the target IAB donor node.

[0306] In the embodiments of the present application, for example, the PDCP entity or the PDCP layer performs using a security configuration to protect an RRC message.

[0307] As known from the above embodiments, when the first indication information is obtained, or when the security configuration in the stored first configuration information includes the security configuration corresponding to the selected or reselected cell, the terminal device applies the security configuration in the stored first configuration information, so that the terminal device can apply the correct security configuration, and the service interruption of the terminal device is reduced.

[0308] Embodiment 8

[0309] The embodiments of the present application provide a migration apparatus of an IAB node, which is applied to a first IAB node. Since the principle of solving the problem of the apparatus is similar to the method of embodiment 2, the specific implementation thereof can refer to the implementation of the method described in embodiment 2, and the same or related contents will not be described repeatedly.

[0310] Figure 18is a schematic diagram of a device for transplanting an IAB node of Embodiment 8 of the present application, as shown in Figure 18 The device 1800 includes:

[0311] A first sending unit 1801, configured to send, to a terminal device served by a first IAB node and / or a child IAB node of the first IAB node, first configuration information including a security configuration configured by a target IAB donor node.

[0312] A second sending unit 1802, configured to send, to the terminal device and / or the child IAB node, first indication information for indicating that the first terminal device applies the security configuration in the first configuration information, the first terminal device including a terminal device served by the first IAB node and / or a terminal device served by a child IAB node of the first IAB node.

[0313] In an embodiment of the present application, the first indication information can be provided in an explicit or implicit manner.

[0314] For example, the first indication information is provided by the first IAB node in an explicit manner.

[0315] For example, the first indication information is included in an L1 indication message or a MAC indication message.

[0316] For example, the L1 indication message reuses a short message of a paging message.

[0317] For example, 1 free bit in the short message is used to indicate that the security configuration in the stored first configuration information is applied.

[0318] For example, when the short message is associated with a paging message, a terminal device identity is included in the paging message, and the short message indicates that the security configuration in the stored first configuration information is applied, the first terminal device applies the security configuration in the stored first configuration information.

[0319] For example, the free bit in the short message indicates an index of the security configuration in the stored first configuration information that is applied.

[0320] For example, when the short message is associated with a paging message, a terminal device identity is included in the paging message, and the short message indicates the index of the security configuration in the stored first configuration information that is applied, the first terminal device applies the security configuration corresponding to the index of the security configuration in the stored first configuration information.

[0321] For example, the MAC indication message indicates whether the security configuration in the stored first configuration information is applied or indicates a cell identity through a MAC CE.

[0322] For example, 1 bit in the MAC CE is used to indicate whether to apply the security configuration in the stored first configuration information.

[0323] For example, when the MAC CE includes a cell identity, the security configuration corresponding to the cell identity in the stored first configuration information is applied.

[0324] For example, the first indication information is provided in an implicit manner by changing the cell identity using the same physical cell identity (PCI).

[0325] For example, when a cell identity is configured by operation, administration and maintenance (OAM) or signaling and the cell identity is different from the previous cell identity, the new cell identity is applied, and the application of the new cell identity includes that the system information and the RRC dedicated message include the new cell identity.

[0326] In the embodiments of the present application, for example, as shown in Figure 18 The apparatus 1800 further includes:

[0327] The first receiving unit 1803 is configured to receive the first configuration information from a source IAB donor node of the first IAB node.

[0328] In the embodiments of the present application, the first configuration information can be included in a first RRC message.

[0329] In the embodiments of the present application, the first RRC message includes second indication information,

[0330] The second indication information is used to indicate that the terminal device and / or a terminal device served by a child IAB node of the first IAB node stores the first RRC message or part of the configuration in the first RRC message or the first configuration information including the security configuration.

[0331] For example, the first RRC message is a transplant configuration message, a security update message or an RRC reconfiguration message.

[0332] For example, the security configuration in the first configuration information includes the security configuration of one cell.

[0333] For example, the security configuration in the first configuration information includes at least one entry, and the entry includes a cell identity and a security configuration corresponding to the cell identity.

[0334] For example, the first configuration information further includes a condition for applying the security configuration in the stored first configuration information and / or a valid time and / or area of the entry.

[0335] From the above embodiments, when the first indication information is obtained, or when the security configuration in the stored first configuration information includes the security configuration corresponding to the selected or reselected cell, the terminal device applies the security configuration in the stored first configuration information, so that the terminal device can apply the correct security configuration, and the service interruption of the terminal device is reduced.

[0336] Embodiment 9

[0337] The embodiments of the present application provide a migration device of an IAB node, which is applied to a first IAB donor node, the first IAB donor node being a source IAB donor node of a first IAB node. Since the principle of solving the problem of the device is similar to the method of embodiment 3, the specific implementation can refer to the implementation of the method described in embodiment 3, and the same or related contents will not be repeated.

[0338] Figure 19 is a schematic diagram of the migration device of the IAB node of embodiment 9, as shown in Figure 19 The device 1900 includes:

[0339] A third sending unit 1901 is configured to send first configuration information to the first IAB node, the first configuration information including a security configuration configured by a target IAB donor node; and

[0340] A fourth sending unit 1902 is configured to send third indication information to the target IAB donor node, the third indication information being used to instruct a first terminal device to apply the security configuration in the first configuration information, the first terminal device including a terminal device served by the first IAB node and / or a terminal device served by a child IAB node of the first IAB node.

[0341] In the embodiments of the present application, the third indication information can be sent to the first terminal device by the source IAB donor node of the first IAB node through the target IAB donor node and the first IAB node.

[0342] For example, the third indication information is sent by the source IAB donor node of the first IAB node to the target IAB donor node through an Xn interface or an NG interface, and is sent by the target IAB donor node to the first IAB node through an F1 interface.

[0343] For example, the third indication information is included in a system message or a terminal device-specific dedicated message.

[0344] For example, when the network device includes an indication in the system message, the first terminal device applies the security configuration; or when the network device includes a cell ID in the system message, the first terminal device applies the configuration corresponding to the cell in the security configuration.

[0345] In the embodiment of the application, the third sending unit 1901 can send the first configuration information to the first IAB node through an Xn interface or an NG interface.

[0346] In the embodiment of the application, the first configuration information can be included in a first RRC message.

[0347] For example, the first RRC message includes second indication information, the second indication information being used to indicate that the first terminal device stores the first RRC message or part of the configuration in the first RRC message or the first configuration information including the security configuration.

[0348] For example, the first RRC message is a transplant configuration message, a security update message or an RRC reconfiguration message.

[0349] For example, the security configuration in the first configuration information includes the security configuration of one cell.

[0350] For example, the security configuration in the first configuration information includes at least one entry, the entry including a cell identifier and a security configuration corresponding to the cell identifier.

[0351] For example, the first configuration information further includes a condition of applying the stored security configuration in the first configuration information and / or a valid time and / or area of the entry.

[0352] From the above embodiments, it can be known that when the first indication information is obtained, or when the security configuration in the stored first configuration information includes the security configuration corresponding to the selected or reselected cell, the terminal device applies the security configuration in the stored first configuration information, so that the terminal device can apply the correct security configuration, and the service interruption of the terminal device is reduced.

[0353] Embodiment 10

[0354] The embodiment of the application provides a terminal device, which includes the transplant device of the IAB node as described in the embodiment 7.

[0355] Figure 20 is a schematic block diagram of the system structure of the terminal device of the embodiment 10 of the application. As shown in the figure, the terminal device 2000 can include a processor 2010 and a memory 1920; the memory 1920 is coupled to the processor 1910. It is worth noting that the figure is exemplary; other types of structures can also be used to supplement or replace the structure to realize the telecommunication function or other functions. Figure 20

[0356] ​In an embodiment of the present application, the functions of the migration device of the IAB node can be integrated into the processor 2010. The processor 2010 can be configured to store first configuration information, the first configuration information comprising a security configuration of a target IAB donor node configuration; and apply the security configuration in the stored first configuration information when the first indication information is obtained, or when the security configuration in the stored first configuration information comprises a security configuration corresponding to the selected or reselected cell.

[0357] In another embodiment, the migration device of the IAB node can be configured separately from the processor 2010, for example, the migration device of the IAB node can be configured as a chip connected to the processor 2010, and the functions of the migration device of the IAB node are realized through the control of the processor 2010.

[0358] As shown in Figure 20 , the terminal device 2000 can also include a communication module 2030, an input unit 2040, a display 2050, and a power supply 2060. It should be noted that the terminal device 2000 does not necessarily include all the components shown in Figure 20 ; in addition, the terminal device 2000 can also include components not shown in Figure 20 , which can be referred to related art.

[0359] As shown in Figure 20 , the processor 2010, also known as a controller or operation control, can include a microprocessor or other processor device and / or logic device, which receives input and controls the operation of each component of the terminal device 2000.

[0360] The memory 2020, for example, can be one or more of a buffer, a flash memory, a hard drive, a removable media, a volatile memory, a non-volatile memory, or other suitable device. Various data can be stored, and programs related to information can also be stored. The processor 2010 can execute the programs stored in the memory 2020 to achieve information storage or processing, etc. The functions of other components are similar to the existing ones, and will not be described here. The components of the terminal device 2000 can be realized by dedicated hardware, firmware, software, or a combination thereof, without departing from the scope of the present application.

[0361] From the above embodiments, when the first indication information is obtained, or when the security configuration in the stored first configuration information comprises a security configuration corresponding to the selected or reselected cell, the terminal device applies the security configuration in the stored first configuration information, so that the terminal device can apply the correct security configuration, and reduce the service interruption of the terminal device.

[0362] Embodiment 11

[0363] The embodiment of the present application provides a network device, which comprises the IAB node migration device as described in the embodiment 8.

[0364] Figure 21 is a schematic block diagram of the system configuration of the network device of the embodiment 11. As shown in the figure, Figure 21 the network device 2100 can comprise a processor 2110 and a memory 2120; the memory 2120 is coupled to the processor 2110. The memory 2120 can store various data; in addition, the memory 2120 also stores a program 2130 for information processing, and the program 2130 is executed under the control of the processor 2110 to receive various information sent by a terminal device and send various information to the terminal device.

[0365] In one embodiment, the function of the IAB node migration device can be integrated into the processor 2110. The processor 2110 can be configured to send first configuration information to a terminal device served by a first IAB node and / or a child IAB node of the first IAB node, the first configuration information comprising security configuration configured by a target IAB donor node; and send first indication information to the terminal device and / or the child IAB node, the first indication information being used to instruct a first terminal device to apply the security configuration in the first configuration information, the first terminal device comprising the terminal device served by the first IAB node and / or a terminal device served by the child IAB node of the first IAB node.

[0366] In another embodiment, the IAB node migration device can be configured separately from the processor 2110, for example, the IAB node migration device can be configured as a chip connected with the processor 2110, and the function of the IAB node migration device is realized through the control of the processor 2110.

[0367] In addition, as shown in the figure, Figure 21 the network device 2100 can further comprise a transceiver 2140, an antenna 2150 and the like; wherein the functions of the above components are similar to those in the prior art, and will not be repeated here. It is worth noting that the network device 2100 does not necessarily have all the components shown in the figure Figure 21 ; in addition, the network device 2100 can also comprise components not shown in the figure Figure 21 , which can refer to the prior art.

[0368] As can be seen from the above embodiments, when the first indication information is obtained, or when the security configuration in the stored first configuration information comprises the security configuration corresponding to the selected or reselected cell, the terminal device applies the security configuration in the stored first configuration information, so that the terminal device can apply the correct security configuration, and the service interruption of the terminal device is reduced.

[0369] Embodiment 12

[0370] The embodiment of the application provides a network device, which comprises the migration device of the IAB node as described in the embodiment 9.

[0371] Figure 22 is a schematic block diagram of the system configuration of the network device of the embodiment 12 of the application. As shown in the figure, the network device 2200 can comprise a processor 2210 and a memory 2220; the memory 2220 is coupled to the processor 2210. The memory 2220 can store various data; in addition, the memory 2220 also stores a program 2230 for information processing, and the program 2230 is executed under the control of the processor 2210 to receive various information sent by a terminal device and send various information to the terminal device. Figure 22

[0372] In an embodiment, the function of the migration device of the IAB node can be integrated into the processor 2210. The processor 2210 can be configured to send first configuration information to the first IAB node, the first configuration information comprising a security configuration configured by a target IAB donor node; and send third indication information to the target IAB donor node, the third indication information being used for indicating that the security configuration in the first configuration information is applied by a first terminal device, the first terminal device comprising a terminal device served by the first IAB node and / or a terminal device served by a child IAB node of the first IAB node.

[0373] In another embodiment, the migration device of the IAB node can be configured separately from the processor 2210, for example, the migration device of the IAB node can be configured as a chip connected with the processor 2210, and the function of the migration device of the IAB node is realized through the control of the processor 2210.

[0374] In addition, as shown in the figure, the network device 2200 can further comprise a transceiver 2240, an antenna 2250 and the like; wherein the functions of the above-mentioned components are similar to those in the prior art, and will not be described here in detail. It should be noted that the network device 2200 does not necessarily comprise all the components shown in the figure; in addition, the network device 2200 can further comprise components not shown in the figure, which can be referred to the prior art. Figure 22 Figure 22 Figure 22

[0375] ​​​​As can be known from the above embodiments, when the first indication information is obtained, or when the security configuration in the stored first configuration information includes the security configuration corresponding to the selected or reselected cell, the terminal device applies the security configuration in the stored first configuration information, so that the terminal device can apply the correct security configuration, and the service interruption of the terminal device is reduced.

[0376] Embodiment 13

[0377] An embodiment of the present application provides a communication system.

[0378] For example, the communication system includes a first network device and a terminal device, the terminal device is the terminal device according to the embodiment 10, and the first network device is the network device according to the embodiment 12.

[0379] Figure 23 is a schematic diagram of the communication system of the embodiment 13 of the present application. As shown in Figure 23 , the communication system 2300 includes a first network device 2301 and a terminal device 2302. That is, the terminal device is directly connected with the IAB host node.

[0380] For another example, the communication system includes a first network device, a second network device and a terminal device, the terminal device is the terminal device according to the embodiment 10, the first network device is the network device according to the embodiment 12, and the second network device is a target IAB host node of the first IAB node.

[0381] Figure 24 is another schematic diagram of the communication system of the embodiment 13 of the present application. As shown in Figure 24 , the communication system 2400 includes a first network device 2401, a second network device 2402 and a terminal device 2403, and the terminal device 2403 is directly connected with the first network device 2401 or the second network device 2402 as the IAB host node.

[0382] For another example, the communication system includes a first network device, a second network device and a terminal device, the terminal device is the terminal device according to the embodiment 10, the first network device is the network device according to the embodiment 12, and the second network device is the network device according to the embodiment 11.

[0383] Figure 25 is another schematic diagram of the communication system of the embodiment 13 of the present application. As shown in Figure 25As shown, the communication system 2500 includes a first network device 2501, a second network device 2502, and a terminal device 2503. The second network device 2502 is a relay node, i.e., a first IAB node, and the terminal device 2503 connects with the first network device 2501 via the second network device 2502. In addition, the communication system 2500 further includes a fourth network device 2504, which is a target IAB donor node of the first IAB node.

[0384] For another example, the communication system includes a first network device, a second network device, a third network device, and a terminal device, the terminal device is the terminal device according to the embodiment 10, the first network device is the network device according to the embodiment 12, the second network device is the network device according to the embodiment 11, and the third 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.

[0385] Figure 26 is another schematic diagram of the communication system of the embodiment 13 of the present application. As shown in Figure 26 , the communication system 2600 includes a first network device 2601, a second network device 2602, a third network device 2603, and a terminal device 2604. The second network device 2602 is a relay node, i.e., a first IAB node, the third network device 2603 is a child IAB node of the second network device 2602, i.e., the first IAB node, and the terminal device 2604 is a terminal device served by the third network device 2603, i.e., the first IAB node. In addition, the communication system 2600 further includes a fourth network device 2605, which is a target IAB donor node of the first IAB node.

[0386] Figure 27 is another schematic diagram of the communication system of the embodiment 13 of the present application. As shown in Figure 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. The second network device 2702 is a relay node, i.e., a first IAB node, the third network device 2703 is a child IAB node of the second network device 2702, i.e., the first IAB node, and the terminal device 2704 is a terminal device served by the second network device 2702, i.e., the first IAB node. In addition, the communication system 2700 further includes a fourth network device 2705, which is a target IAB donor node of the first IAB node.

[0387] In Figure 25 , Figure 26 and Figure 27In the example of FIG. 1, the communication system has a source IAB donor node and a target IAB donor node. In embodiments of the present application, the communication system can also have one IAB donor node.

[0388] Figure 28 is another schematic diagram of the communication system of embodiment 13 of the present application. As shown in FIG. 28, the communication system 2800 includes a first network device 2801, a second network device 2802, and a terminal device 2803. The second network device 2802 is a relay node, i.e., a first IAB node, and the terminal device 2803 connects with the first network device 2801 via the second network device 2802. Figure 28

[0389] Figure 29 is another schematic diagram of the communication system of embodiment 13 of the present application. As shown in FIG. 29, the communication system 2900 includes a first network device 2901, a second network device 2902, a third network device 2903, and a terminal device 2904. The second network device 2902 is a relay node, i.e., a first IAB node, the third network device 2903 is a child IAB node of the second network device 2902, i.e., the first IAB node, and the terminal device 2904 is a terminal device served by the third network device 2903, i.e., a child IAB node of the first IAB node. Figure 29

[0390] Figure 30 is another schematic diagram of the communication system of embodiment 13 of the present application. As shown in FIG. 29, the communication system 2900 includes a first network device 2901, a second network device 2902, a third network device 2903, and a terminal device 2904. The second network device 2902 is a relay node, i.e., a first IAB node, the third network device 2903 is a child IAB node of the second network device 2902, i.e., the first IAB node, and the terminal device 2904 is a terminal device served by the third network device 2903, i.e., a child IAB node of the first IAB node. Figure 30

[0391] The apparatuses and methods of the present application can be realized by hardware, or by software plus hardware, which can be implemented by a processor of a personal computer and the like. The present application relates to a computer program that, when executed by a logic device, causes the logic device to implement the above-described apparatuses or constituent components, or causes the logic device to implement the above-described various methods or steps. The logic device is, for example, a field programmable logic device, a microprocessor, a processor used in a computer, and the like. The present application also relates to a storage medium for storing the above program, such as a hard disk, a magnetic disk, an optical disk, a DVD, a flash memory, and the like.

[0392] ​​​The methods / apparatuses described in connection with the embodiments disclosed herein can be embodied directly in hardware, software executed by a processor, or combination thereof. For example, Figure 16 One or more of the functional blocks shown in the functional block diagrams shown in the embodiments described herein and / or one or more combinations of the functional blocks can correspond to individual software modules or individual hardware modules. The software modules can correspond to the individual steps shown in the flowcharts shown in the embodiments described herein. The hardware modules can be implemented, for example, by using field-programmable gate arrays (FPGAs) to hardwire the software modules. Figure 9

[0393] The software modules can reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. A storage medium can be coupled to the processor such that the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium can be integral to the processor. The processor and the storage medium can reside in an ASIC. The software modules can be stored in a memory of the mobile terminal, or in a memory card that can be inserted into the mobile terminal. For example, if the device (e.g., the mobile terminal) uses a MEGA-SIM card or a flash memory device of large capacity, the software modules can be stored in the MEGA-SIM card or the flash memory device of large capacity.

[0394] With reference to the drawings described above Figure 16 One or more of the functional blocks shown in the embodiments described above and / or one or more combinations of the functional blocks can 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 device, discrete gate or transistor logic, discrete hardware components, or any suitable combination thereof, for performing the functions described herein. With reference to the drawings described above Figure 16 One or more of the functional blocks shown in the embodiments described above and / or one or more combinations of the functional blocks can also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.

[0395] The present application has been described above with the aid of specific embodiments; however, various modifications and changes can be suggested by those skilled in the art, and it is intended that the present application embrace all such modifications and changes as fall within the scope of the appended claims. The description herein of any advantages and aspects of the application does not limit the application to these advantages and aspects. It is the

[0396] According to the various embodiments disclosed in the embodiments described herein, the following notes are also disclosed: ​

[0397] Addendum I

[0398] 1. A migration apparatus of an IAB node, the apparatus is applied to a first terminal device, the first terminal device comprises terminal devices served by a first IAB node and / or terminal devices served by child IAB nodes of the first IAB node, the apparatus comprises:

[0399] a first storage unit, configured to store first configuration information, the first configuration information comprises a security configuration configured by a target IAB donor node; and

[0400] a first application unit, configured to apply the security configuration in the stored first configuration information when first indication information is obtained, or when the security configuration in the stored first configuration information comprises a security configuration corresponding to a selected or reselected cell.

[0401] 2. The apparatus according to the addendum 1, wherein,

[0402] the first indication information is provided in an explicit or implicit manner.

[0403] 3. The apparatus according to the addendum 1 or 2, wherein,

[0404] the first indication information is provided by the first IAB node in an explicit manner.

[0405] 4. The apparatus according to any one of the addendums 1-3, wherein,

[0406] the first indication information is included in a L1 indication message or a MAC indication message.

[0407] 5. The apparatus according to the addendum 4, wherein,

[0408] the L1 indication message reuses a short message of a paging message.

[0409] 6. The apparatus according to the addendum 5, wherein,

[0410] 1 free bit in the short message is used to indicate to apply the security configuration in the stored first configuration information.

[0411] 7. The apparatus according to the addendum 5 or 6, wherein,

[0412] the first application unit applies the security configuration in the stored first configuration information when the short message is associated with a paging message, and a terminal device identifier is included in the paging message and the short message indicates to apply the security configuration in the stored first configuration information.

[0413] 8. The apparatus of clause 5, wherein,

[0414] The free bit in the short message indicates an index of the security configuration in the stored first configuration information.

[0415] 9. The apparatus of clause 8, wherein,

[0416] When the short message is associated with a paging message, and a terminal device identity is included in the paging message and the short message indicates the index of the security configuration in the stored first configuration information, the first application unit applies a security configuration corresponding to the index of the security configuration in the stored first configuration information.

[0417] 10. The apparatus of clause 4, wherein,

[0418] The MAC indication message indicates whether to apply the security configuration in the stored first configuration information or indicates a cell identity (ID) by a MAC CE.

[0419] 11. The apparatus of clause 10, wherein,

[0420] One bit in the MAC CE is used to indicate whether to apply the security configuration in the stored first configuration information corresponding to the bit.

[0421] 12. The apparatus of clause 10, wherein,

[0422] When the MAC CE includes a cell identity, the first application unit applies a security configuration in the stored first configuration information corresponding to the cell identity.

[0423] 13. The apparatus of clause 1 or 2, wherein,

[0424] The first indication information is provided by a source IAB-donor node of the first IAB node in an explicit manner.

[0425] 14. The apparatus of clause 13, wherein,

[0426] The first indication information is sent to the first terminal device by the source IAB-donor node of the first IAB node via a target IAB-donor node of the first IAB node and the first IAB node.

[0427] 15. The apparatus of clause 14, wherein,

[0428] The first indication information is sent by a source IAB donor node of the first IAB node to a target IAB donor node of the first IAB node over an Xn interface or an NG interface, and is sent by the target IAB donor node to the first IAB node over an Fl interface.

[0429] 16. The apparatus according to any one of the preceding 13-15, wherein

[0430] The first indication information is comprised in a system message or a terminal device specific dedicated message.

[0431] 17. The apparatus according to any one of the preceding 1 or 2, wherein

[0432] The first indication information is provided in an implicit manner by the first terminal device detecting a cell identity change of a cell with a same physical cell identity (PCI).

[0433] 18. The apparatus according to any one of the preceding 1-17, wherein

[0434] The first configuration information is comprised in a first RRC message.

[0435] 19. The apparatus according to the preceding 18, wherein

[0436] The first RRC message comprises second indication information,

[0437] The second indication information is used to indicate the first terminal device to store the first RRC message or a part of configuration in the first RRC message or the first configuration information comprising the security configuration.

[0438] 20. The apparatus according to the preceding 18 or 19, wherein

[0439] The first RRC message is a migration configuration message, a security update message or an RRC reconfiguration message.

[0440] 21. The apparatus according to any one of the preceding 1-20, wherein

[0441] The security configuration in the first configuration information comprises a security configuration of one cell.

[0442] 22. The apparatus according to the preceding 21, wherein

[0443] The security configuration in the first configuration information comprises at least one entry comprising a cell identity and a security configuration corresponding to the cell identity.

[0444] 23. The apparatus according to the preceding 22, wherein

[0445] The first configuration information further comprises a condition and / or a time and / or an area in which the security configuration in the stored first configuration information is applied.

[0446] 24. The apparatus according to any one of appendices 1, 18-23, wherein the apparatus further comprises:

[0447] a first detecting unit configured to perform integrity detection; and

[0448] a first selecting unit configured to perform cell selection or reselection when integrity detection failure occurs.

[0449] 25. The apparatus according to appendix 24, wherein the apparatus further comprises:

[0450] a first processing unit configured to perform connection reestablishment or apply the security configuration in the stored first configuration information according to the selected or reselected cell.

[0451] 26. The apparatus according to appendix 24 or 25, wherein,

[0452] the selected or reselected cell is the same as the cell where integrity detection failure occurs or is an intra-frequency cell or an inter-frequency cell.

[0453] 27. The apparatus according to any one of appendices 24-26, wherein,

[0454] when the first configuration information is received and the first configuration information comprises the security configuration of the first cell or the first cell identity, and integrity detection failure occurs on the first cell, the first terminal device does not consider that the cell or the frequency where the cell is located is prohibited, or the first terminal device takes the cell or an intra-frequency cell as a candidate cell for cell selection or reselection.

[0455] 28. The apparatus according to any one of appendices 1-27, wherein the apparatus further comprises:

[0456] a fifth sending unit configured to send a first RRC reconfiguration complete message protected by the security configuration configured by the source IAB donor node; and / or,

[0457] a sixth sending unit configured to send a second RRC reconfiguration complete message protected by the security configuration configured by the target IAB donor node.

[0458] 28a. The apparatus according to appendix 28, wherein,

[0459] A RRC message protected using a security configuration configured by a source IAB-donor node refers to the RRC message being ciphered using a ciphering algorithm and corresponding key from the security configuration configured by the source IAB-donor node, and being integrity protected using an integrity algorithm and corresponding key from the security configuration configured by the source IAB-donor node.

[0460] 28b. The apparatus according to any of the preceding 28a, wherein,

[0461] A RRC message protected using a security configuration configured by a source IAB-donor node refers to the RRC message being ciphered using a ciphering algorithm and corresponding key from the security configuration configured by the source IAB-donor node, and being integrity protected using an integrity algorithm and corresponding key from the security configuration configured by the source IAB-donor node.

[0462] 28c. The apparatus according to any of the preceding 28a, wherein,

[0463] A RRC message protected using a security configuration configured by a target IAB-donor node refers to the RRC message being ciphered using a ciphering algorithm and corresponding key from the security configuration configured by the target IAB-donor node, and being integrity protected using an integrity algorithm and corresponding key from the security configuration configured by the target IAB-donor node.

[0464] 28d. The apparatus according to any of the preceding 28a-28c, wherein,

[0465] A PDCP entity or PDCP layer performs the protection of a RRC message using a security configuration.

[0466] 29. A migration apparatus of an IAB node, the apparatus being applied to a first IAB node, the apparatus comprising:

[0467] a first sending unit configured to send first configuration information to a terminal device served by the first IAB node and / or a child IAB node of the first IAB node, the first configuration information comprising a security configuration configured by a target IAB-donor node; and

[0468] a second sending unit configured to send first indication information to the terminal device and / or the child IAB node, the first indication information being used to indicate that a first terminal device applies the security configuration in the first configuration information, the first terminal device comprising the terminal device served by the first IAB node and / or a terminal device served by the child IAB node of the first IAB node.

[0469] 30. The apparatus according to the preceding 29, wherein,

[0470] The first indication information is provided in an explicit or implicit manner.

[0471] 31. The apparatus of any one of the preceding or following claims 29 or 30, wherein,

[0472] the first indication information is provided by the first IAB node in an explicit manner.

[0473] 32. The apparatus of any one of the preceding or following claims 29-31, wherein,

[0474] the first indication information is comprised in a L1 indication message or a MAC indication message.

[0475] 33. The apparatus of claim 32, wherein,

[0476] the L1 indication message reuses a short message of a paging message.

[0477] 34. The apparatus of claim 33, wherein,

[0478] one free bit in the short message is used to indicate to apply the security configuration in the stored first configuration information.

[0479] 35. The apparatus of claim 33 or 34, wherein,

[0480] when the short message is associated with a paging message, and a terminal device identity is comprised in the paging message and the short message indicates to apply the security configuration in the stored first configuration information, the first terminal device applies the security configuration in the stored first configuration information.

[0481] 36. The apparatus of claim 33, wherein,

[0482] a free bit in the short message indicates an index of the security configuration in the stored first configuration information.

[0483] 37. The apparatus of claim 36, wherein,

[0484] when the short message is associated with a paging message, and a terminal device identity is comprised in the paging message and the short message indicates the index of the security configuration in the stored first configuration information, the first terminal device applies a security configuration corresponding to the index of the security configuration in the stored first configuration information.

[0485] 38. The apparatus of claim 32, wherein,

[0486] the MAC indication message indicates whether to apply the security configuration in the stored first configuration information or indicates a cell identity by a MAC CE.

[0487] 39. The apparatus of any one of Embodiment 38, wherein,

[0488] one bit in the MAC CE is used to indicate whether to apply the security configuration in the stored first configuration information.

[0489] 40. The apparatus of any one of Embodiment 38, wherein,

[0490] when the MAC CE includes a cell identity, applying the security configuration corresponding to the cell identity in the stored first configuration information.

[0491] 41. The apparatus of any one of Embodiments 29 or 30, wherein,

[0492] the first indication information is provided in an implicit manner by changing the cell identity using the same physical cell identity (PCI).

[0493] 42. The apparatus of Embodiment 41, wherein,

[0494] when a cell identity is configured by operation, administration, and management (OAM) or signaling and the cell identity is different from a previous cell identity, applying the new cell identity,

[0495] the applying the new cell identity includes the system information and RRC dedicated message including the new cell identity.

[0496] 43. The apparatus of any one of Embodiments 29-42, wherein the apparatus further comprises:

[0497] a first receiving unit, configured to receive the first configuration information from a source IAB-donor node of the first IAB node.

[0498] 44. The apparatus of any one of Embodiments 29-43, wherein,

[0499] the first configuration information is included in a first RRC message.

[0500] 45. The apparatus of Embodiment 44, wherein,

[0501] the first RRC message includes second indication information,

[0502] the second indication information is used to indicate the terminal device and / or a child IAB node of the first IAB node serving terminal devices to store the first RRC message or part of the configuration in the first RRC message or the first configuration information including the security configuration.

[0503] 46. The apparatus of Embodiment 44 or 45, wherein, The first RRC message is a migration configuration message, a security update message, or an RRC reconfiguration message.

[0504] The first RRC message is a migration configuration message, a security update message, or an RRC reconfiguration message.

[0505] 47. The apparatus of any of appendices 29-32, wherein,

[0506] The security configuration in the first configuration information comprises a security configuration of one cell.

[0507] 48. The apparatus of appendix 47, wherein,

[0508] The security configuration in the first configuration information comprises at least one entry comprising a cell identity and a security configuration corresponding to the cell identity.

[0509] 49. The apparatus of appendix 47, wherein,

[0510] The first configuration information further comprises a condition and / or a time and / or an area in which the security configuration in the stored first configuration information and / or the entry is valid.

[0511] 50. A migration apparatus of 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 a first IAB node,

[0512] The apparatus comprises:

[0513] a third sending unit configured to send first configuration information to the first IAB node, the first configuration information comprising a security configuration configured by a target IAB donor node; and

[0514] a fourth sending unit configured to send third indication information to the target IAB donor node, the third indication information being used to instruct a first terminal device to apply the security configuration in the first configuration information, the first terminal device comprising a terminal device served by the first IAB node and / or a terminal device served by a child IAB node of the first IAB node.

[0515] 51. The apparatus of appendix 50, wherein,

[0516] The third indication information is sent to the first terminal device by the source IAB donor node of the first IAB node via the target IAB donor node and the first IAB node.

[0517] 52. The apparatus of appendix 51, wherein,

[0518] The third indication information is sent by a source IAB donor node of the first IAB node to the target IAB donor node through an Xn interface or an NG interface, and is sent by the target IAB donor node to the first IAB node through an Fl interface.

[0519] 53. The apparatus of any one of the preceding appendices 50-52, wherein,

[0520] The third indication information is included in a system message or a terminal device specific dedicated message.

[0521] 54. The apparatus of the preceding appendix 53, wherein,

[0522] The first terminal device applies the security configuration when the network device includes an indication in a system message; or,

[0523] The first terminal device applies a configuration corresponding to a cell in the security configuration when the network device includes a cell ID in a system message.

[0524] 55. The apparatus of any one of the preceding appendices 50-54, wherein,

[0525] The second sending unit sends first configuration information to the first IAB node through an Xn interface or an NG interface.

[0526] 56. The apparatus of any one of the preceding appendices 50-55, wherein,

[0527] The first configuration information is included in a first RRC message.

[0528] 57. The apparatus of the preceding appendix 56, wherein,

[0529] The first RRC message includes second indication information,

[0530] The second indication information is used to instruct the first terminal device to store the first RRC message or part of the configuration in the first RRC message or the first configuration information including the security configuration.

[0531] 58. The apparatus of the preceding appendix 56 or 57, wherein,

[0532] The first RRC message is a migration configuration message, a security update message or an RRC reconfiguration message.

[0533] 59. The apparatus of any one of the preceding appendices 50-58, wherein,

[0534] The security configuration in the first configuration information includes a security configuration of a cell.

[0535] 60. The apparatus according to any one of Embodiments 59,

[0536] The security configuration in the first configuration information comprises at least one entry, the entry comprising a cell identity and a security configuration corresponding to the cell identity.

[0537] 61. The apparatus according to any one of Embodiments 60,

[0538] The first configuration information further comprises a condition and / or a time and / or an area in which the security configuration in the stored first configuration information is applied.

[0539] 62. A terminal device, the terminal device comprising the apparatus according to any one of Embodiments 1-28.

[0540] 63. A network device, the network device comprising the apparatus according to any one of Embodiments 29-61.

[0541] 64. A communication system, the communication system comprising a first network device and a terminal device,

[0542] The terminal device comprises the apparatus according to any one of Embodiments 1-28.

[0543] The first network device comprises the apparatus according to any one of Embodiments 50-61.

[0544] 65. A communication system, the communication system comprising a first network device, a fourth network device and a terminal device,

[0545] The terminal device comprises the apparatus according to any one of Embodiments 1-28.

[0546] The first network device comprises the apparatus according to any one of Embodiments 50-61,

[0547] The fourth network device is a target IAB-donor node of the first IAB node.

[0548] 66. A communication system, the communication system comprising a first network device, a second network device and a terminal device,

[0549] The terminal device comprises the apparatus according to any one of Embodiments 1-28,

[0550] The first network device comprises the apparatus according to any one of Embodiments 50-61,

[0551] The second network device comprises the apparatus according to any one of Embodiments 29-49.

[0552] 67. A communication system comprising a first network device, a second network device, a third network device and a terminal device,

[0553] the terminal device comprises the apparatus according to any one of appendices 1-28,

[0554] the first network device comprises the apparatus according to any one of appendices 50-61,

[0555] the second network device comprises the apparatus according to any one of appendices 29-49,

[0556] the third network device is a child node of the first IAB node.

[0557] 68. The communication system according to appendix 67, wherein,

[0558] the terminal device is a terminal device served by the second network device or the third network device.

[0559] Appendix II:

[0560] 1. A migration method of an IAB node, the method is applied to a first terminal device, the first terminal device comprises a terminal device served by a first IAB node and / or a terminal device served by a child IAB node of the first IAB node, the method comprises:

[0561] storing first configuration information, the first configuration information comprises a security configuration configured by a target IAB donor node; and

[0562] applying the security configuration in the stored first configuration information when obtaining first indication information, or when the security configuration in the stored first configuration information comprises a security configuration corresponding to a selected or reselected cell.

[0563] 2. The method according to appendix 1, wherein,

[0564] the first indication information is provided in an explicit or implicit manner.

[0565] 3. The method according to appendix 1 or 2, wherein,

[0566] the first indication information is provided by the first IAB node in an explicit manner.

[0567] 4. The method according to any one of appendices 1-3, wherein,

[0568] the first indication information is comprised in a L1 indication message or a MAC indication message.

[0569] 5. The method according to appendix 4, wherein,

[0570] The L1 indication message reuses a short message of a paging message.

[0571] 6. The method of clause 5, wherein,

[0572] One free bit in the short message is used to indicate the security configuration in the stored first configuration information to be applied.

[0573] 7. The method of clause 5 or 6, wherein,

[0574] When the short message is associated with a paging message, and a terminal device identity is included in the paging message and the short message indicates the security configuration in the stored first configuration information to be applied, the first terminal device applies the security configuration in the stored first configuration information.

[0575] 8. The method of clause 5, wherein,

[0576] A free bit in the short message indicates an index of the security configuration in the stored first configuration information to be applied.

[0577] 9. The method of clause 8, wherein,

[0578] When the short message is associated with a paging message, and a terminal device identity is included in the paging message and the short message indicates the index of the security configuration in the stored first configuration information to be applied, the first terminal device applies the security configuration corresponding to the index of the security configuration in the stored first configuration information.

[0579] 10. The method of clause 4, wherein,

[0580] The MAC indication message indicates whether the security configuration in the stored first configuration information is to be applied or indicates a cell identity (ID) by a MAC CE.

[0581] 11. The method of clause 10, wherein,

[0582] One bit in the MAC CE is used to indicate whether the security configuration corresponding to the bit in the stored first configuration information is to be applied.

[0583] 12. The method of clause 10, wherein,

[0584] When the MAC CE includes one cell identity, the security configuration corresponding to the cell identity in the stored first configuration information is applied.

[0585] 13. The method of any one of the preceding embodiments, wherein

[0586] The first indication information is provided by the source IAB-donor node of the first IAB node in an explicit manner.

[0587] 14. The method of any one of the preceding embodiments, wherein

[0588] The first indication information is transmitted by the source IAB-donor node of the first IAB node to the first terminal device via the target IAB-donor node of the first IAB node and the first IAB node.

[0589] 15. The method of any one of the preceding embodiments, wherein

[0590] The first indication information is transmitted by the source IAB-donor node of the first IAB node to the target IAB-donor node of the first IAB node over an Xn interface or an NG interface, and by the target IAB-donor node to the first IAB node over an Fl interface.

[0591] 16. The method of any one of the preceding embodiments, wherein

[0592] The first indication information is included in a system message or a terminal device specific dedicated message.

[0593] 17. The method of any one of the preceding embodiments, wherein

[0594] The first indication information is provided in an implicit manner by the first terminal device detecting a change of cell identity of a same physical cell identity (PCI).

[0595] 18. The method of any one of the preceding embodiments, wherein

[0596] The first configuration information is included in a first RRC message.

[0597] 19. The method of any one of the preceding embodiments, wherein

[0598] The first RRC message includes second indication information,

[0599] The second indication information is used to indicate the first terminal device to store the first RRC message or a part of configuration in the first RRC message or the first configuration information including the security configuration.

[0600] 20. The method of any one of the preceding embodiments, wherein

[0601] The first RRC message is a migration configuration message, a security update message or an RRC reconfiguration message.

[0602] 21. The method according to any one of appendices 1-20, wherein,

[0603] the security configuration in the first configuration information comprises a security configuration of one cell.

[0604] 22. The method according to appendix 21, wherein,

[0605] the security configuration in the first configuration information comprises at least one entry comprising a cell identity and a security configuration corresponding to the cell identity.

[0606] 23. The method according to appendix 22, wherein,

[0607] the first configuration information further comprises a condition and / or a time and / or an area in which the security configuration in the stored first configuration information and / or the entry is valid.

[0608] 24. The method according to any one of appendices 1, 18-23, wherein, the method further comprises:

[0609] performing integrity check; and

[0610] when integrity check failure occurs, performing cell selection or reselection.

[0611] 25. The method according to appendix 24, wherein, the method further comprises:

[0612] performing connection reestablishment or applying the security configuration in the stored first configuration information according to the selected or reselected cell.

[0613] 26. The method according to appendix 24 or 25, wherein,

[0614] the selected or reselected cell is the same as the cell where integrity check failure occurs or is an intra-frequency cell or an inter-frequency cell.

[0615] 27. The method according to any one of appendices 24-26, wherein,

[0616] when the first configuration information is received and the first configuration information comprises a security configuration of a first cell or a first cell identity, and integrity check failure occurs on the first cell, the first terminal device does not consider that the cell or the frequency where the cell is located is forbidden, or the first terminal device considers the cell or an intra-frequency cell as a candidate cell for cell selection or reselection.

[0617] 28. The method according to any one of appendices 1-27, wherein, the method further comprises:

[0618] sending a first RRC reconfiguration complete message protected using security configuration configured by the source IAB-donor node; and / or,

[0619] sending a second RRC reconfiguration complete message protected using security configuration configured by the target IAB-donor node.

[0620] 28a. The method of clause 28, wherein,

[0621] protecting a RRC message using security configuration configured by the source IAB-donor node means encrypting the RRC message using encryption algorithm and corresponding key in the security configuration configured by the source IAB-donor node, and integrity protecting the RRC message using integrity algorithm and corresponding key in the security configuration configured by the source IAB-donor node.

[0622] 28b. The method of clause 28a, wherein,

[0623] protecting a RRC message using security configuration configured by the source IAB-donor node means encrypting the RRC message using encryption algorithm and corresponding key in the security configuration configured by the source IAB-donor node, and integrity protecting the RRC message using integrity algorithm and corresponding key in the security configuration configured by the source IAB-donor node.

[0624] 28c. The method of clause 28a, wherein,

[0625] protecting a RRC message using security configuration configured by the target IAB-donor node means encrypting the RRC message using encryption algorithm and corresponding key in the security configuration configured by the target IAB-donor node, and integrity protecting the RRC message using integrity algorithm and corresponding key in the security configuration configured by the target IAB-donor node.

[0626] 28d. The method of any one of clauses 28-28c, wherein,

[0627] the PDCP entity or PDCP layer performs protecting a RRC message using security configuration.

[0628] 29. A migration method of an IAB node, the method applied to a first IAB node, the method comprising:

[0629] sending, to a terminal device served by the first IAB node and / or a child IAB node of the first IAB node, first configuration information, the first configuration information comprising security configuration configured by a target IAB-donor node; and

[0630] transmitting first indication information to the terminal device and / or the child IAB node, the first indication information being used to indicate that the first terminal device applies the security configuration in the first configuration information, the first terminal device including a terminal device served by the first IAB node and / or a terminal device served by a child IAB node of the first IAB node.

[0631] 30. The method of clause 29, wherein,

[0632] The first indication information is provided in an explicit or implicit manner.

[0633] 31. The method of clause 29 or 30, wherein,

[0634] The first indication information is provided by the first IAB node in an explicit manner.

[0635] 32. The method of any of clauses 29-31, wherein,

[0636] The first indication information is included in a L1 indication message or a MAC indication message.

[0637] 33. The method of clause 32, wherein,

[0638] The L1 indication message reuses a short message of a paging message.

[0639] 34. The method of clause 33, wherein,

[0640] One free bit in the short message is used to indicate to apply the security configuration in the stored first configuration information.

[0641] 35. The method of clause 33 or 34, wherein,

[0642] The first terminal device applies the security configuration in the stored first configuration information when the short message is associated with a paging message, and a terminal device identity is included in the paging message and the short message indicates to apply the security configuration in the stored first configuration information.

[0643] 36. The method of clause 33, wherein,

[0644] A free bit in the short message indicates an index of the security configuration in the stored first configuration information to apply.

[0645] 37. The method of clause 36, wherein,

[0646] When the short message is associated with a paging message, and the terminal device identity is included in the paging message and the short message indicates the index of the security configuration in the stored first configuration information, the first terminal device applies the security configuration corresponding to the index of the security configuration in the stored first configuration information.

[0647] 38. The method of clause 32, wherein,

[0648] The MAC indication message indicates whether to apply the security configuration in the stored first configuration information or indicates a cell identity by a MAC CE.

[0649] 39. The method of clause 38, wherein,

[0650] One bit in the MAC CE is used to indicate whether to apply the security configuration in the stored first configuration information.

[0651] 40. The method of clause 38, wherein,

[0652] When the MAC CE includes a cell identity, the security configuration corresponding to the cell identity in the stored first configuration information is applied.

[0653] 41. The method of clause 29 or 30, wherein,

[0654] The first indication information is provided in an implicit manner by changing the cell identity using the same physical cell identity (PCI).

[0655] 42. The method of clause 41, wherein,

[0656] When a cell identity is configured by operation, administration, and maintenance (OAM) or signaling and the cell identity is different from a previous cell identity, the new cell identity is applied,

[0657] The applying the new cell identity includes that system information and RRC dedicated messages include the new cell identity.

[0658] 43. The method of any of clauses 29-42, wherein the method further comprises:

[0659] receiving the first configuration information from a source IAB donor node of the first IAB node.

[0660] 44. The method of any of clauses 29-43, wherein,

[0661] The first configuration information is included in a first RRC message.

[0662] 45. The method of clause 44, wherein,

[0663] the first RRC message comprises second indication information,

[0664] the second indication information is used to instruct the terminal device and / or a terminal device served by a child IAB node of the first IAB node to store the first RRC message or part of the configuration in the first RRC message or the first configuration information comprising the security configuration.

[0665] 46. The method of clause 44 or 45, wherein,

[0666] the first RRC message is a migration configuration message, a security update message or an RRC reconfiguration message.

[0667] 47. The method of any of clauses 29-32, wherein,

[0668] the security configuration in the first configuration information comprises a security configuration of one cell.

[0669] 48. The method of clause 47, wherein,

[0670] the security configuration in the first configuration information comprises at least one entry comprising a cell identity and a security configuration corresponding to the cell identity.

[0671] 49. The method of clause 47, wherein,

[0672] the first configuration information further comprises a condition and / or a time and / or an area in which the security configuration in the stored first configuration information is valid.

[0673] 50. A migration method of an IAB node, the method is applied to a first IAB donor node, the first IAB donor node is a source IAB donor node of a first IAB node,

[0674] the method comprises:

[0675] sending, to the first IAB node, first configuration information comprising a security configuration configured by a target IAB donor node; and

[0676] sending, to the target IAB donor node, third indication information used to instruct a first terminal device to apply the security configuration in the first configuration information, the first terminal device comprising a terminal device served by the first IAB node and / or a terminal device served by a child IAB node of the first IAB node.

[0677] 51. The method of any one of appendices 50, wherein,

[0678] The third indication information is sent by a source IAB-donor node of the first IAB node to the first terminal device via the target IAB-donor node and the first IAB node.

[0679] 52. The method of any one of appendices 51, wherein,

[0680] The third indication information is sent by a source IAB-donor node of the first IAB node to the target IAB-donor node over an Xn interface or an NG interface, and to the first IAB node by the target IAB-donor node over an Fl interface.

[0681] 53. The method of any one of appendices 50-52, wherein,

[0682] The third indication information is included in a system message or a terminal device specific dedicated message.

[0683] 54. The method of any one of appendices 53, wherein,

[0684] The first terminal device applies the security configuration when the network device includes an indication in a system message; or,

[0685] The first terminal device applies the configuration corresponding to a cell in the security configuration when the network device includes a cell ID in a system message.

[0686] 55. The method of any one of appendices 50-54, wherein, the sending the first configuration information to the first IAB node comprises:

[0687] sending the first configuration information to the first IAB node over an Xn interface or an NG interface.

[0688] 56. The method of any one of appendices 50-55, wherein,

[0689] The first configuration information is included in a first RRC message.

[0690] 57. The method of any one of appendices 56, wherein,

[0691] The first RRC message includes second indication information,

[0692] The second indication information is used to indicate the first terminal device to store the first RRC message or part of the configuration in the first RRC message or the first configuration information including the security configuration.

[0693] 58. The method according to any of appendices 56 or 57, wherein,

[0694] The first RRC message is a GUMMEY configuration message, a security update message or an RRC reconfiguration message.

[0695] 59. The method according to any of appendices 50-58, wherein,

[0696] The security configuration in the first configuration information comprises a security configuration of one cell.

[0697] 60. The method according to appendix 59, wherein,

[0698] The security configuration in the first configuration information comprises at least one entry comprising a cell identity and a security configuration corresponding to the cell identity.

[0699] 61. The method according to appendix 60, wherein,

[0700] The first configuration information further comprises a condition and / or a time and / or an area in which the security configuration in the stored first configuration information and / or the entry is valid for applying.

Claims

1. An apparatus for migration of an IAB node, the apparatus being applied to a first terminal device, the first terminal device comprising a terminal device served by a first IAB node and / or a terminal device served by a child IAB node of the first IAB node, the apparatus comprising: a first storage unit configured to store first configuration information, the first configuration information comprising security configuration configured by a target IAB-donor node, wherein the first configuration information comprises at least one security configuration, and when the first configuration information comprises at least two security configurations, each security configuration corresponds to a cell ID or an index; and a first application unit configured to apply the security configuration in the stored first configuration information when first indication information is obtained, or when the security configuration in the stored first configuration information comprises a security configuration corresponding to a selected or reselected cell. 2.The apparatus of claim 1, wherein the first indication information is comprised in a L1 indication message or a MAC indication message. 3.The apparatus of claim 2, wherein the L1 indication message reuses a short message of a paging message. 4.The apparatus of claim 3, wherein 1 free bit in the short message is used to indicate to apply the security configuration in the stored first configuration information. 5.The apparatus of claim 3, wherein free bits in the short message indicate an index of the security configuration in the stored first configuration information to apply. 6.The apparatus of claim 2, wherein the MAC indication message indicates whether to apply the security configuration in the stored first configuration information or indicates a cell ID (ID) by a MAC CE. 7.The apparatus of claim 6, wherein the first application unit applies the security configuration in the stored first configuration information corresponding to the cell ID when the MAC CE comprises the cell ID. 8.The apparatus of claim 1, wherein the first indication information is provided by a source IAB-donor node of the first IAB node in an explicit manner. 9.The apparatus of claim 8, wherein the first indication information is transmitted to the first terminal device by the source IAB-donor node of the first IAB node via a target IAB-donor node of the first IAB node and the first IAB node. 10.The apparatus of claim 9, wherein the first indication information is transmitted by the source IAB-donor node of the first IAB node to the target IAB-donor node of the first IAB node through an Xn interface or an NG interface, and transmitted by the target IAB-donor node to the first IAB node through an F1 interface. 11.The apparatus of claim 1, wherein the first indication information is provided in an implicit manner by detecting, by the first terminal device, a cell ID change of a same physical cell ID (PCI). 12.The apparatus of claim 1, wherein the first configuration information is comprised in a first RRC message. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 13. The apparatus of claim 12, wherein the first RRC message comprises second indication information, the second indication information is used to instruct the first terminal device to store the first RRC message or part of configurations in the first RRC message or the first configuration information comprising the security configuration.

14. The apparatus of claim 1, wherein, the apparatus further comprises: a first detection unit configured to perform integrity detection; and a first selection unit configured to select or reselect a cell when integrity detection failure occurs.

15. The apparatus of claim 14, wherein, the apparatus further comprises: a first processing unit configured to perform connection reestablishment or apply the security configuration in the stored first configuration information according to the selected or reselected cell.

16. An apparatus for migration of an IAB node, the apparatus being applied to a first IAB node, the apparatus comprising: a first sending unit configured to send first configuration information to terminal devices served by the first IAB node and / or child IAB nodes of the first IAB node, the first configuration information comprising security configuration configured by a target IAB donor node, wherein the first configuration information comprises at least one security configuration, and when the first configuration information comprises at least two security configurations, each security configuration corresponds to a cell ID or an index; and a second sending unit configured to send first indication information to the terminal devices and / or the child IAB nodes, the first indication information being used to instruct first terminal devices to apply the security configuration in the first configuration information, the first terminal devices comprising the terminal devices served by the first IAB node and / or terminal devices served by the child IAB nodes of the first IAB node.

17. The apparatus of claim 16, wherein the first indication information is provided in an implicit manner by changing a cell ID using a same physical cell ID (PCI).

18. An apparatus for migration of 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 a first IAB node, the apparatus comprising: a third sending unit configured to send first configuration information to the first IAB node, the first configuration information comprising security configuration configured by a target IAB donor node, wherein the first configuration information comprises at least one security configuration, and when the first configuration information comprises at least two security configurations, each security configuration corresponds to a cell ID or an index; and a fourth sending unit configured to send third indication information to the target IAB donor node, the third indication information being used to instruct first terminal devices to apply the security configuration in the first configuration information, the first terminal devices comprising the terminal devices served by the first IAB node and / or terminal devices served by child IAB nodes of the first IAB node.

19. The apparatus of claim 18, wherein the third indication information is sent to the first terminal devices by the source IAB donor node of the first IAB node via the target IAB donor node and the first IAB node.

20. The apparatus of claim 19, wherein, the third indication information is sent by a source IAB-donor node of the first IAB node to the target IAB-donor node over an Xn interface or an NG interface, and by the target IAB-donor node to the first IAB node over an Fl interface.

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