Signal transmission / reception method, device, and communication system

Abstract

The embodiments of the present invention provide a signal transmission / reception method, an apparatus and a communication system, the signal transmission / reception apparatus being applied to a procedure in which an IAB-node controlled by a first donor aggregation unit (Donor-CU) transitions from a first distribution unit (DU) to a second DU, the apparatus being disposed in the first Donor-CU, the apparatus including a first processing unit, the first processing unit being configured to control to transmit one or more first path transition configurations for an access backhaul integration node (IAB-node) to the IAB-node, and to transmit one or more second path transition configurations for a child node of the IAB-node to the child node, the first path transition configuration corresponding to a first candidate cell of the IAB-node or a DU to which the first candidate cell of the IAB-node belongs, and the second path transition configuration corresponding to a second candidate cell of the IAB-node or a DU to which the second candidate cell of the IAB-node belongs.

Description

[Technical field]

[0001] FIELD OF THE DISCLOSURE The present invention relates to the field of communications technology. [Background technology]

[0002] Integrated access and backhaul (IAB) realizes the function of radio relay in next generation radio access network (NG-RAN). Integrated access and backhaul node (IAB-node) supports access and backhaul via new radio (NR). The network side end of NR backhaul is called IAB-donor, which represents a network device (e.g. gNB) that supports IAB function.

[0003] An IAB node can be connected to one IAB-donor via single or multi-hop connections. These multi-hop connections form a topological structure of a Directed Acyclic Graph (DAG) with the IAB-donor as the root node. The IAB-donor performs centralized resource management, topology management, and routing management of the IAB network topology.

[0004] The IAB-node supports the function of gNB-DU (distributed unit). The IAB-node DU is also called IAB-DU, which is the termination point of the radio access (NR access) interface between the terminal equipment (UE) and the next hop IAB-node, and the termination point of the F1 protocol to the gNB-CU (IAB-node: aggregation unit) at the IAB-donor. The IAB-DU can provide services to normal UE and IAB child nodes. The IAB-DU realizes the function of the network side device, connects to the downstream child IAB-node, provides the NR air interface to the UE and the downstream child IAB-node, and establishes the F1 connection between the IAB donor-CU.

[0005] In addition to the gNB-DU functionality, the IAB-node supports a part of the UE functionality called IAB-MT (mobile termination). The IAB-MT includes, for example, physical layer, layer 2, RRC, and NAS functionality for connecting to a gNB-DU of another IAB-node or IAB-donor, connecting to a gNB-CU at the IAB-donor, and connecting to the core network. The IAB-MT can support, for example, UE physical layer, access stratum (AS), radio resource control (RRC), and non-access stratum (NAS) layer functionality, and can connect to an IAB parent node.

[0006] FIG. 1 is a schematic diagram of an example of an IAB topology structure. As shown in FIG. 1, in the IAB topology structure 10, an IAB-node 100 includes an IAB-MT functional unit 101 and an IAB-DU functional unit 102, and an adjacent node at the interface of the IAB-DU functional unit 102 is called a child node 201, and includes, for example, the child nodes 201, 202, and 203 shown in FIG. 1. The IAB-DU functional unit 102 and the child nodes 201, 202, and 203 can communicate with each other via an air interface (Uu). The adjacent node at the interface of the IAB-MT functional unit 101 is called a parent node, and includes, for example, the parent nodes 301 and 302 shown in FIG. 1. The IAB-MT functional unit 101 and the parent nodes 301 and 302 can communicate with each other via an air interface (Uu).

[0007] 1, the direction from the IAB-node 100 to the child nodes 201, 202, 203 is referred to as the downstream direction, and the direction from the IAB-node 100 to the parent nodes 301, 302 is referred to as the upstream direction. An IAB-donor (not shown) performs centralized resource, topology, and routing management for the IAB topology structure 10.

[0008] The above description of the background art is merely for the purpose of more clearly and completely explaining the configurations of the present invention and for the understanding of those skilled in the art, and should not be construed as meaning that these configurations are well known to those skilled in the art just because they are described in the background art of the present invention. Summary of the Invention [Problem to be solved by the invention]

[0009] In order to shorten the service interruption time in the IAB-node path transition procedure, the IAB-node and its child node may simultaneously perform F1 path transition. That is, send an RRC reconfiguration message for transitioning the F1 transmission path to the child node of the IAB-node via the original path, that is, send an RRC reconfiguration message to the child node before the IAB-node completes the handover. After the IAB-node successfully accesses the parent node on the target side, perform the transition of the F1 transmission path. There are two specific ways for the downstream child node to perform the transition of the F1 transmission path. That is, after the IAB-node successfully accesses the parent node on the target side, send an F1 transition instruction message to the downstream child node, and after the child node receives the instruction, perform the transition of the F1 transmission path. Alternatively, the RRC reconfiguration message of the child node is not directly sent to the child node, but is first buffered in the IAB-node, and after the IAB-node successfully accesses the parent node on the target side, send the RRC message of the child node to the child node to perform the transition of the F1 transmission path.

[0010] However, the inventors of the present invention have found that the above method in which a downstream child node performs F1 transmission path transition has the following drawbacks.

[0011] 1.When an IAB-node moves between different donor-CUs, the IAB-node and child nodes cannot update the network topology at the same time.

[0012] 2. When an IAB-node moves between the same donor-CU or different donor-CUs, when the handover of the IAB-node fails, the child node cannot perform correct route transition, which increases the service interruption time in the route transition procedure.

[0013] 3. If the IAB-node is configured with conditional handover (CHO), there are target routes for multiple candidate cells, and after the IAB-node performs handover, the child node cannot perform F1 transmission route transition simultaneously with the IAB-node.

[0014] In consideration of at least one of the above problems, embodiments of the present invention provide a signal transmission / reception method, device, and communication system in which, when an IAB-node moves from a first DU to a second DU, a first Donor-CU sends a first route transition configuration for the IAB-node and a second route transition configuration for the child node to the IAB-node and the child node of the IAB-node, respectively, so that the IAB-node and the child node can simultaneously transition the transmission route when the IAB-node moves within or between Donor-CUs. [Means for solving the problem]

[0015] In one aspect of an embodiment of the present invention, a signal transmission / reception device is provided that is applied to a procedure in which an IAB-node controlled by a first donor aggregation unit (Donor-CU) transitions from a first distributed unit (DU) to a second DU, the device being disposed in the first Donor-CU, the device including a first processing unit, the first processing unit being configured to control to transmit one or more first path transition configurations for an access backhaul integration node (IAB-node) to the IAB-node and to transmit one or more second path transition configurations for a child node of the IAB-node to the child node, the first path transition configuration corresponding to a first candidate cell of the IAB-node or a DU to which the first candidate cell of the IAB-node belongs, and the second path transition configuration corresponding to a second candidate cell of the IAB-node or a DU to which the second candidate cell of the IAB-node belongs.

[0016] In another aspect of the embodiment of the present invention, there is provided a signal transmission / reception device applied to a procedure in which an IAB-node controlled by a first donor aggregation unit (Donor-CU) transitions from a first distribution unit (DU) to a second DU, the device being disposed in a second Donor-CU, the device including a second processing unit, the second processing unit being configured to: receive one or more first path transition requests for an access backhaul integration node (IAB-node) from a first Donor-CU; transmit one or more first path transition configurations for the IAB-node from the second Donor-CU to the first Donor-CU; and transmit one or more first path transition configurations for the IAB-node from the first Donor-CU to the second Donor-CU. -The apparatus is configured to receive one or more second path transition requests for child nodes of the IAB-node from a Donor-CU, and control the second Donor-CU to send one or more second path transition configurations for child nodes of the IAB-node to the first Donor-CU, where the first path transition request corresponds to a first candidate cell of the IAB-node, the second path transition request corresponds to a second candidate cell of the IAB-node, the first path transition configuration corresponds to the first candidate cell of the IAB-node or a DU to which the first candidate cell belongs, and the second path transition configuration corresponds to the second candidate cell of the IAB-node or a DU to which the second candidate cell belongs.

[0017] Another aspect of an embodiment of the present invention provides a signal transmission / reception device applied to a procedure in which an IAB-node transitions from a first distributed unit (DU) of a first Donor-CU to a second DU, the device being disposed in the IAB-node, the device including a third processing unit, the third processing unit being configured to control the IAB-node to receive one or more first path transition configurations for the IAB-node transmitted by a first Donor-CU, the first path transition configuration corresponding to a first candidate cell of the IAB-node or a DU to which the first candidate cell of the IAB-node belongs, if an execution condition of the first path transition configuration is satisfied, the IAB-node to execute the first path transition configuration and initiate random access to a first candidate cell corresponding to the first path transition configuration, and if the random access is successful, the IAB-node to send a first transition success indication to a child node.

[0018] Another aspect of an embodiment of the present invention provides a signal transmission / reception device applied to a procedure in which an IAB-node controlled by a first donor aggregation unit (Donor-CU) transitions from a first distributed unit (DU) to a second DU, the device being disposed in a child node of the IAB-node, the device including a fourth processing unit, the fourth processing unit being configured to control the child node of the IAB-node to receive one or more second path transition configurations for the child node transmitted by the first Donor-CU, the second path transition configurations corresponding to a second candidate cell of the IAB-node or a DU to which the second candidate cell of the IAB-node belongs, the child node to receive a first transition success indication transmitted when a random access initiated by the IAB-node to a first candidate cell is successful, and the child node to execute a second path transition configuration corresponding to the second candidate cell or a DU to which the second candidate cell belongs.

[0019] Another aspect of the present invention provides a signal transmission / reception method corresponding to the signal transmission / reception device of any of the above aspects.

[0020] The advantageous effects of the embodiment of the present invention are as follows: A first Donor-CU sends a first route transition configuration for an IAB-node and a second route transition configuration for a child node to the IAB-node and the child node of the IAB-node, respectively, so that the IAB-node and the child node can simultaneously transition the transmission route when the IAB-node moves within or between Donor-CUs.

[0021] As shown in the following description and drawings, certain embodiments of the present invention are disclosed in detail to show the manner in which the principles of the present invention can be employed. However, the scope of the embodiments of the present invention is not limited to these. The embodiments of the present invention include modifications, alterations and equivalents within the spirit and scope of the appended claims.

[0022] Features described and / or illustrated in one embodiment may be used in the same or similar manner in one or more other embodiments and may be combined with or substituted for features in the other embodiments.

[0023] It should be noted that in this text, the term "including / having" means the presence of a feature, element, step or component, and does not exclude the presence or addition of one or more other features, elements, steps or components. [Brief description of the drawings]

[0024] Elements and features depicted in one drawing and one embodiment of the present invention may be combined with elements and features shown in one or more drawings or embodiments, and in the drawings, like reference numerals may designate corresponding elements in multiple drawings and may designate corresponding elements used in more than one embodiment. [Figure 1] FIG. 2 is a schematic diagram of an example of an IAB topology structure. [Diagram 2] FIG. 1 is a schematic diagram of an example of a change in network topology due to the movement of an IAB-node. [Diagram 3] 2 is a schematic diagram illustrating an example of a signal transmission / reception method according to the first embodiment. [Figure 4] 11 is a schematic diagram illustrating an example of a signal transmission / reception method according to a second embodiment. FIG. [Diagram 5] FIG. 13 is a schematic diagram of an example of a conditional handover by an IAB-node in the first embodiment; [Figure 6] FIG. 13 is a schematic diagram of an example of pre-migration preparation for an IAB-node by a source Donor-CU and a target Donor-CU. [Figure 7] FIG. 13 is a schematic diagram of an example of pre-migration preparation for a child node by a source Donor-CU and a target Donor-CU. [Figure 8] FIG. 13 is a schematic diagram of another example of pre-migration preparation for child nodes by source Donor-CU and target Donor-CU. [Figure 9] FIG. 11 is a schematic diagram illustrating an example of a signal transmission / reception method according to a third embodiment. [Figure 10] FIG. 13 is a schematic diagram illustrating an example of a signal transmission / reception method according to a fourth embodiment. [Figure 11] 1 is a schematic diagram of an example of a signal transmitting / receiving device according to an embodiment of the present invention. [Figure 12] 13 is a schematic diagram of an example of a signal transmitting / receiving device according to a sixth embodiment. FIG. [Figure 13] 13 is a schematic diagram of an example of a signal transmitting / receiving device according to a seventh embodiment. FIG. [Figure 14] 13 is a schematic diagram of an example of a signal transmitting / receiving device according to an eighth embodiment. FIG. [Figure 15] 1 is a schematic diagram of a configuration of a network device according to an embodiment of the present invention. [Figure 16] FIG. 2 is a schematic diagram of a terminal device according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] The above and other features of the present invention will become apparent from the following description. In the specification and drawings, specific embodiments of the present invention are disclosed in detail, and some of the embodiments in which the principles of the present invention can be employed are shown. However, the present invention is not limited to the described embodiments. The present invention includes all modifications, variations, and equivalents within the scope of the appended claims.

[0026] In embodiments of the present invention, the terms "first", "second", etc. are used in the title to distinguish different elements, but do not represent the spatial arrangement or temporal order of these elements, and these elements are not limited to these terms. The term "and / or" includes any and all combinations of one or more of the terms listed in the associated list. The terms "including", "comprising", "having", etc. refer to the presence of listed features, elements, elements or components, but do not exclude the presence or addition of one or more other features, elements, elements or components.

[0027] In the embodiments of the present invention, the singular forms "a", "the", etc., include the plural forms and should be understood broadly as "one kind" or "a class", and are not limited to "one". In addition, the term "said" should be understood to include both the singular and the plural forms, unless the context clearly indicates otherwise. In addition, the term "described in" should be understood to mean "described at least in part", and the term "based on" should be understood to mean "based at least in part on", unless the context clearly indicates otherwise.

[0028] In an embodiment of the present invention, the term "communication network" or "wireless communication network" may refer to a network conforming to any communication standard, such as, for example, new radio (NR), Long Term Evolution (LTE), Advanced Long Term Evolution (LTE-A, LTE-Advanced), Wideband Code Division Multiple Access (WCDMA), High-Speed ​​Packet Access (HSPA), etc.

[0029] Additionally, communications between devices in a communication system may occur according to any generation of communication protocols, including, but not limited to, 1G (generation), 2G, 2.5G, 2.75G, 3G, 4G, 4.5G, 5G, and new radio (NR), and / or other currently known or future developed communication protocols.

[0030] In the embodiment of the present invention, the term "network device" refers to a device in a communication system, for example, allowing a terminal device to access the communication system and providing a service to the terminal device. The network device may include, but is not limited to, an access backhaul integration node (IAB-node), a base station (BS), an access point (AP), a transmission reception point (TRP), a broadcast transmitter, a mobility management entity (MME), a gateway, a server, a radio network controller (RNC), a base station controller (BSC), etc.

[0031] Among them, the base station may include, but is not limited to, a Node B (NodeB or NB), an evolved Node B (eNodeB or eNB), and a 5G base station (gNB), etc., as well as a Remote Radio Head (RRH), a Remote Radio Unit (RRU), a relay, or a low power node (e.g., femto, pico, etc.). Also, the term "base station" may include some or all of the functions thereof, and each base station may provide communication coverage for a particular geographic area. The term "cell" may refer to a base station and / or its coverage area depending on the context in which the term is used.

[0032] In the embodiment of the present invention, the term "User Equipment" (UE) or "Terminal Equipment" (TE) refers to an apparatus that accesses a communication network and receives a network service via, for example, a network device. The terminal apparatus may be fixed or mobile, and may be called a mobile station (MS), a terminal, a subscriber station (SS), an access terminal (AT), a station, etc.

[0033] Among them, the terminal device may include, but is not limited to, a mobile phone, a personal digital assistant (PDA), a wireless modulation / demodulation device, a wireless communication device, a handheld device, a machine-type communication device, a laptop computer, a cordless phone, a smartphone, a smart watch, a digital camera, and the like.

[0034] For example, in a scenario such as the Internet of Things (IoT), the user equipment may be a monitoring or measuring device or equipment, including, but not limited to, a Machine Type Communication (MTC) terminal, an in-vehicle communication terminal, a Device to Device (D2D) terminal, a Machine to Machine (M2M) terminal, etc.

[0035] Furthermore, the term "network side" or "network device side" refers to the side of a network, which may be a base station or may include one or more network devices as described above. The term "user side" or "terminal side" or "user terminal side" refers to the side of a user or terminal, which may be a UE or may include one or more terminal devices as described above.

[0036] In the embodiment of the present invention, the higher layer signaling may be, for example, Radio Resource Control (RRC) signaling, for example, referred to as an RRC message, including, for example, MIB, system information, dedicated RRC message, or referred to as an RRC information element (RRC IE). The higher layer signaling may be, for example, F1-C signaling, or referred to as an F1AP protocol. However, the present invention is not limited thereto.

[0037] During the movement of an IAB-node, when the connection with the original parent IAB-node is disconnected and the connection with a new parent IAB-node is established, a change in the transmission path from the IAB-node and the child node of the IAB-node to the Donor-CU occurs. That is, when the IAB-node is handed over to a new parent node or a dual connection with a new parent node is established, the network topology is changed.

[0038] Figure 2 is a schematic diagram of an example of a change in network topology due to the movement of an IAB-node. As shown in Figure 2, after IAB-node5 hands over from a cell under IAB-node3 to a cell under IAB-node4, the transmission path from IAB-node5 and its downstream child node IAB-node6 to Donor-CU is changed.

[0039] In the network topology update process when the IAB-node moves DU under the same donor-CU, when the IAB-node hands over, the Donor-CU configures the default backhaul RLC channel (default BH RLC channel) and default BAP routing ID of the target path for uplink F1-C and non-F1 data for the IAB-node via an RRC reconfiguration message. If the Donor-DU is changed after the handover, an IP address to be routed to the Donor-DU of the target path can be configured for the IAB-node. Here, the default routing ID includes the BAP address and path ID of the target Donor-DU. After the IAB-node is handed over to a new parent node, the IAB-node starts applying the above configuration, i.e., transitions the transmission paths of F1-C and non-F1 to the target side.

[0040] <Embodiment 1> The first embodiment of the present invention provides a signal transmission and reception method. The method is applied to a procedure in which an IAB-node controlled by a first donor aggregation unit (Donor-CU) transitions from a first distribution unit (DU) to a second DU. The first embodiment of the present invention describes the signal transmission and reception method from the first Donor-CU side.

[0041] 3 is a schematic diagram of an example of a signal transmission and reception method according to embodiment 1. As shown in FIG. 3, the method includes the following steps:

[0042] Step 301: A first Donor-CU sends one or more first path transition configurations for an access backhaul integration node (IAB-node) to the IAB-node.

[0043] Step 302: The first Donor-CU sends one or more second route transition configurations for the child nodes of the IAB-node to the child nodes.

[0044] In the present invention, the first path transition configuration corresponds to a first candidate cell of the IAB-node or a DU to which the first candidate cell of the IAB-node belongs, and the second path transition configuration corresponds to a second candidate cell of the IAB-node or a DU to which the second candidate cell of the IAB-node belongs. Here, the first candidate cell and the second candidate cell may be different. This allows the method to support a scenario in which the candidate cells of the transition path of the IAB-node and the transition path of the child node are different, and realize a more flexible path transition configuration. Note that the first candidate cell and the second candidate cell may be the same.

[0045] According to the first embodiment of the present invention, the first Donor-CU can transmit the first route transition configuration and the second route transition configuration to the IAB-node and the child node of the IAB-node, respectively, so that the IAB-node and the child node can easily perform the transmission route transition, and thus the network topology can be updated.

[0046] In the present invention, both the first DU and the second DU may belong to the first Donor-CU. This allows the IAB-node to migrate inside the first Donor-CU. In this case, the first path transition configuration and the second path transition configuration may be generated in the first Donor-CU. The first DU and the second DU may belong to different Donor-CUs. That is, the first DU may belong to the first Donor-CU, and the second DU may belong to the second Donor-CU. This allows the IAB-node to migrate between the first Donor-CU and the second Donor-CU. In this case, the first path transition configuration and the second path transition configuration may be acquired from the second Donor-CU by the first Donor-CU.

[0047] In the description of the present invention, the first Donor-CU is also referred to as a Source Donor-CU, and the second Donor-CU is also referred to as a Target Donor-CU.

[0048] In step 302, before the IAB-node performs a route transition, the first Donor-CU sends a second route transition configuration to the child node. That is, the first Donor-CU sends the second route transition configuration via the original route. This allows the IAB-node and the child node to switch routes simultaneously.

[0049] As shown in FIG. 3, if the second DU belongs to a second Donor-CU, the method may further include the following steps.

[0050] Step 303: The first Donor-CU sends one or more first route transition requests for the IAB-node to the second Donor-CU.

[0051] Step 304: The first Donor-CU receives one or more first route transition configurations for the IAB-node from the second Donor-CU.

[0052] Step 305: The first Donor-CU sends one or more second route transition requests for the child nodes of the IAB-node to the second Donor-CU.

[0053] Step 306: The first Donor-CU receives one or more second route transition configurations for the child nodes of the IAB-node from the second Donor-CU.

[0054] In steps 303 and 305, the first path change request corresponds to a first candidate cell of the IAB-node, and the second path change request corresponds to a second candidate cell of the IAB-node. For example, the first path change request includes at least a cell identifier of the first candidate cell of the IAB-node, and the second path change request includes at least a cell identifier of the second candidate cell of the IAB-node.

[0055] The first path transition configuration and the second path transition configuration are path configurations of an IAB-node and a child node in a new network topology, respectively, and each includes at least one parameter among an IP address routable to a DU to which the first candidate cell belongs, a routing identifier (Routing ID), a Radio Link Control channel identifier (RLC channel ID), and a new Backhaul Adaptation Protocol (BAP) address.

[0056] In step 303, the first Donor-CU sends a first route transition request for the IAB-node via a handover request message or a secondary node addition request message. In step 304, the first Donor-CU receives a first route transition configuration for the IAB-node via a handover request response message or a secondary node addition request response message. Here, the secondary node addition request message is used for the IAB-node and the second DU to establish a dual connection. Because the movement of the IAB-node brings about a change in topology, the route transition of the IAB-node needs to involve the handover of the IAB-node or the establishment of a dual connection. The route transition request for the IAB-node may be included in the handover request message or the secondary node addition request message for the IAB-node.

[0057] In step 305, the first Donor-CU sends a second route transition request for the child node via a handover request message or a secondary node addition request message, or sends a second route transition request for the child node via a route transition request message. Even if the topology changes due to the movement of the IAB-node, the topology relationship between the child node and the IAB-node does not change, so the child node does not need to perform handover or establish dual connectivity, and only needs to transition the route. The route transition request for the child node does not need to be included in the handover request message or secondary node addition request message for the IAB-node.

[0058] In step 306, the first Donor-CU receives a second route transition configuration for a child node of the IAB-node via a handover request response message or a secondary node addition request response message, or receives a second route transition configuration for the child node via a route transition request response message.

[0059] Thereby, the first Donor-CU may request a route transition for both the IAB-node and the child node, or may request a route transition for the child node individually.

[0060] As shown in FIG. 3, the method further includes the following steps.

[0061] Step 307: The first Donor-CU configures a candidate cell identifier of the IAB-node or a DU identifier to which the candidate cell of the IAB-node belongs, corresponding to one or more first route transition configurations for the IAB-node, in an RRC message and sends it to the IAB-node.

[0062] Step 308: The first Donor-CU configures a candidate cell identifier of the IAB-node corresponding to one or more second path transition configurations for the child node or a DU identifier to which the candidate cell of the IAB-node belongs in an RRC message and sends the RRC message to the child node. For example, the candidate cell identifier may be a physical cell identity (PCI) or a cell global identity (Global Cell Identity) of the candidate cell, and the DU identifier may be a BAP address of the DU.

[0063] As shown in FIG. 3, the method further includes the following steps.

[0064] Step 309: The first Donor-CU sets an execution condition corresponding to the first route transition configuration, and sends the execution condition to the IAB-node.

[0065] For example, the execution condition of the second path transition configuration set by the first Donor-CU is that the signal of the first candidate cell meets the A3 or A5 event requirement, so that the IAB-node can realize a path transition based on a condition, i.e., execute the first path transition configuration when the execution condition set by the first Donor-CU is met.

[0066] As shown in FIG. 3, the method further includes the following steps.

[0067] Step 310: The first Donor-CU sets an execution condition corresponding to the second route transition configuration, and sends the execution condition to the child node.

[0068] For example, the execution condition of the second route transition configuration set by the first Donor-CU is that the child node receives a transition success instruction from the IAB-node, or receives a re-establishment success instruction sent by the IAB-node. Thus, when the execution condition set by the first Donor-CU is satisfied, the child node can execute the second route transition configuration, so that the child node can perform route transition simultaneously with the IAB-node, and the service interruption time in the route transition procedure can be reduced.

[0069] According to embodiment 1 of the present invention, a first Donor-CU requests a route transition configuration from a second Donor-CU, and sends a first route transition configuration for the IAB-node and a second route transition configuration for the child node to the IAB-node and the child node of the IAB-node, respectively, so that the IAB-node and the child node can simultaneously transition the transmission route when the IAB-node moves within or between Donor-CUs.

[0070] <Embodiment 2> Regarding at least the same problem as in embodiment 1, embodiment 2 of the present invention provides a signal transmission / reception method corresponding to the method in embodiment 1. The signal transmission / reception method in embodiment 2 of the present invention is applied to a first donor aggregation unit (Donor-CU) in a procedure in which an IAB-node controlled by the first distribution unit (DU) transitions from a first DU to a second DU. The first DU belongs to the first Donor-CU, the second DU belongs to the second Donor-CU, and the first Donor-CU is different from the second Donor-CU, that is, the IAB-node transitions between different Donor-CUs.

[0071] 4 is a schematic diagram of an example of a signal transmission and reception method according to embodiment 2. As shown in FIG. 4, the method includes the following steps:

[0072] Step 401: The second Donor-CU receives one or more first route transition requests for an access backhaul integration node (IAB-node) from the first Donor-CU.

[0073] Step 402: The second Donor-CU sends one or more first route transition configurations for the IAB-node to the first Donor-CU.

[0074] Step 403: The second Donor-CU receives one or more second route transition requests for the child nodes of the IAB-node from the first Donor-CU.

[0075] Step 404: The second Donor-CU sends one or more second route transition configurations for the child nodes of the IAB-node to the first Donor-CU.

[0076] Here, the first route change request corresponds to a first candidate cell of the IAB-node, the second route change request corresponds to a second candidate cell of the IAB-node, the first route change configuration corresponds to the first candidate cell of the IAB-node or the DU to which the first candidate cell belongs, and the second route change configuration corresponds to the second candidate cell of the IAB-node or the DU to which the second candidate cell belongs.

[0077] In at least one embodiment, the first path change request includes at least a cell identifier of a first candidate cell of the IAB-node, and the second path change request includes at least a cell identifier of a second candidate cell of the IAB-node.

[0078] The first path transition configuration and the second path transition configuration include at least one parameter of an IP address routable to the DU to which the first candidate cell belongs, a routing identifier (Routing ID), a Radio Link Control channel identifier (RLC channel ID), and a new Backhaul Adaptation Protocol (BAP) address.

[0079] In at least one embodiment, the second Donor-CU receives a first path transition request for the IAB-node via a handover request message or a secondary node addition request message, and sends a first path transition configuration for the IAB-node via a handover request response message or a secondary node addition request response message.

[0080] In at least one embodiment, the second Donor-CU receives a second route transition request for the child node via a handover request message or a secondary node addition request message, or receives a second route transition request for the child node via a route transition request message, and sends a second route transition configuration for the IAB-node's child node via a handover request response message or a secondary node addition request response message, or sends a second route transition configuration for the child node via a route transition request response message.

[0081] Hereinafter, a signal transmission / reception method according to the first embodiment and a signal transmission / reception method according to the second embodiment will be described with reference to specific examples.

[0082] Example 1 In the first embodiment, a method in which a child node performs transition of an F1 transmission path when an IAB-node performs a conditional handover (CHO) or a conditional dual connectivity establishment will be exemplarily described.

[0083] When an IAB-node performs CHO, the IAB-node may be configured with multiple candidate cells. If the signal quality of the candidate cell meets the condition, the IAB-node accesses the candidate cell. When the IAB-node accesses different candidate cells, it configures different network topologies, i.e., different F1 transmission paths. Both the IAB-node and the child node need to perform F1 transition configuration for multiple IAB-node candidate cells.

[0084] When the IAB-node performs CHO between Donor-CUs, the source Donor-CU may request the target Donor-CU or secondary node Donor-CU to configure F1 transition configurations of one or more candidate cells. Each Handover Request message or S-Node Addition Request message includes conditional handover information for one candidate cell. The target Donor-CU or secondary node Donor-CU configures the F1 transition parameters of the IAB-node and child nodes for each candidate cell or the DU to which the candidate cell belongs. If different candidate cell DUs result in different F1 transmission paths, and two candidate cells belong to the same DU, the target transmission paths are the same, so the F1 transition parameters for different DUs may be configured.

[0085] The source Donor-CU may individually request F1 migration configurations for child nodes and request F1 migration configurations under one or more IAB-node candidate cells from the target Donor-CU or secondary node Donor-CU for the child nodes using F1 migration request messages. Each F1 migration request message targets one IAB-node candidate cell.

[0086] The target Donor-CU or secondary node Donor-CU configures F1 transition parameters for the IAB-node or secondary node, and generates an RRC reconfiguration message for each IAB-node candidate cell or DU. The RRC reconfiguration message includes an IP address routable to the DU to which the candidate cell belongs, a routing ID, a radio link control channel ID, a new BAP address, etc. The RRC reconfiguration message for the IAB-node is included in an RRC container of a Handover request acknowledge message sent by the target Donor-CU or an S-Node Addition Request Acknowledge message sent by the secondary node Donor-CU. Upon receiving it, the source donor-CU composes the RRC reconfiguration messages in multiple containers and the IAB-node candidate cell identifiers or DU identifiers to which the candidate cells belong corresponding to each RRC reconfiguration message into one RRC reconfiguration message and sends it to the IAB-node. The RRC reconfiguration message for the child node is included in the RRC container of the Handover request acknowledge sent by the target Donor-CU or the S-Node Addition Request Acknowledge sent by the secondary node Donor-CU, or is included in the RRC container of the F1 transition response message sent by the target Donor-CU or the secondary node Donor-CU. Upon receiving this, the source donor-CU composes the RRC reconfiguration messages in the multiple containers and the IAB-node candidate cell identifiers or the DU identifiers to which the candidate cells belong corresponding to each RRC reconfiguration message into one RRC reconfiguration message and sends it to the child node.

[0087] When the IAB-node performs CHO or conditional dual connectivity establishment in the same Donor-CU, the F1 transition parameters configured by the Donor-CU for the IAB-node or child node also generate an RRC reconfiguration message including a new IP address anchored in DU, a routing identifier, a default radio link control channel, and a new backhaul adaptation protocol address for each IAB-node candidate cell or DU to which the candidate cell belongs. The Donor-CU configures multiple RRC reconfiguration messages and the IAB-node candidate cell identifiers or target DU identifiers corresponding to each RRC reconfiguration message into one RRC reconfiguration message and sends it to the IAB-node or child node.

[0088] When the IAB-node sends the F1 transition configuration to the child node before transitioning the path, the F1 transition configuration may be a conditional configuration, i.e., the configuration is executed only when a certain condition is met. For example, the RRC reconfiguration is executed only when a transition success indication sent by the parent node is received. The source Donor-CU may set the execution condition and send an RRC message including the F1 transition configuration and the corresponding execution condition to the child node. The successful transition indication is used to indicate that the IAB-node has successfully accessed the candidate cell, and includes the candidate cell identifier of the IAB-node or the DU identifier to which the candidate cell belongs. The candidate cell identifier may be the Global Cell ID or the Physical Cell ID of the cell, and the DU identification information may be the BAP address of the DU. In this way, the child node can perform a path transition to the same candidate cell at the same time as the IAB-node.

[0089] FIG. 5 is a schematic diagram of an example of a conditional handover by an IAB-node in the first embodiment.

[0090] As shown in FIG. 5(a), before the conditional handover, an RRC reconfiguration message is sent via the original path to IAB-node4 (denoted by 501), as well as to child nodes IAB-node5 (denoted by 502) and IAB-node6 (denoted by 503).

[0091] As shown in (b) of FIG. 5, IAB-node4 is handed over under DU2, and a new path (i.e., target path) is formed. As shown in 504, IAB-node4 transmits an F1 migration indication to child nodes IAB-node5 and IAB-node6. Also, as shown in 505, IAB-node4 transmits an RRC ReconfigComplete message to Donor-CU via the target path.

[0092] As shown in (c) of FIG. 5, as shown in 506 and 507, the child nodes IAB-node5 and IAB-node6 transmit an RRC ReconfigComplete message to the Donor-CU via the target path.

[0093] 6 is a schematic diagram of an example of pre-migration preparation for an IAB-node by a source Donor-CU and a target Donor-CU. As shown in FIG. 6, an F1 transition request for an IAB-node may be sent in a Handover Request for the IAB-node, and an F1 transition request response may be sent in a Handover request acknowledge.

[0094] 7 is a schematic diagram of an example of pre-migration preparation for a child node by a source Donor-CU and a target Donor-CU. As shown in FIG. 7, an F1 migration request for a child node may be included in a Handover Request for an IAB-node, and an F1 migration response may be included in a Handover Request Acknowledge for an IAB-node and sent.

[0095] 8 is a schematic diagram of another example of pre-migration preparation for a child node by a source Donor-CU and a target Donor-CU. As shown in FIG. 8, an F1 migration request for a child node may be sent separately, and an F1 migration response for a child node may also be sent separately.

[0096] In this embodiment, when the IAB-node performs CHO, the source Donor-CU may include conditional handover information in the Handover Request to request F1 transition configuration for one or more candidate cells of the IAB-node.

[0097] According to embodiment 2 of the present invention, a first Donor-CU requests a route transition configuration from a second Donor-CU, and sends a first route transition configuration for the IAB-node and a second route transition configuration for the child node to the IAB-node and the child node of the IAB-node, respectively, so that the IAB-node and the child node can simultaneously transition the transmission route when the IAB-node moves within or between Donor-CUs.

[0098] <Embodiment 3> Regarding at least the same problem as in embodiment 1, embodiment 3 of the present invention provides a signal transmission / reception method corresponding to the method in embodiment 1. The signal transmission / reception method in embodiment 3 of the present invention is applied to an IAB-node in a procedure in which an IAB-node controlled by a first donor aggregation unit (Donor-CU) transitions from a first distribution unit (DU) to a second DU.

[0099] 9 is a schematic diagram of an example of a signal transmission and reception method according to embodiment 3. As shown in FIG. 9, the method includes the following steps.

[0100] Step 901: An IAB-node receives one or more first path transition configurations for the IAB-node sent by a first Donor-CU, where the first path transition configurations correspond to a first candidate cell of the IAB-node or a DU to which the first candidate cell of the IAB-node belongs.

[0101] Step 902: If an execution condition for the first route transition configuration is met, the IAB-node executes the first route transition configuration, and initiates random access to a first candidate cell corresponding to the first route transition configuration.

[0102] Step 903: If the random access is successful, the IAB-node sends a first transition success indication to the child node.

[0103] According to embodiment 3, when an IAB-node moves within a Donor-CU or between Donor-CUs, the IAB-node and child nodes can simultaneously migrate the transmission path, thereby reducing the service interruption time during the path migration procedure.

[0104] In at least one embodiment, the first transition success indication includes a cell identifier of the first candidate cell or an identifier of a DU to which the first candidate cell belongs.

[0105] After the child node receives the first transition success instruction, whether to execute the second transition configuration is determined based on whether the first candidate cell for the IAB-node and the second candidate cell for the child node are the same. For example, if the first candidate cell and the second candidate cell are the same, or if the DU to which the first candidate cell belongs and the DU to which the second candidate cell belongs are the same, it means that the child node holds a path configuration in the same candidate cell as the IAB-node, and the child node executes the second path transition configuration corresponding to the second candidate cell or the DU to which the second candidate cell belongs. Also, for example, if the first candidate cell and the second candidate cell are different, or if the DU to which the first candidate cell belongs and the DU to which the second candidate cell belongs are different, it means that the child node does not have a path configuration in the same candidate cell as the IAB-node and cannot transition the path at the same time as the IAB-node, and the child node does not execute the second path transition configuration.

[0106] As a result, when the IAB-node has routes configured for multiple candidate cells, if the IAB-node's route transition is successful, the child nodes can simultaneously transition their routes according to the cells transitioned by the IAB-node, thereby reducing the service interruption time.

[0107] As shown in FIG. 9, the method further includes the following steps.

[0108] Step 904: If the random access in step 902 fails, the IAB-node returns to the original route configuration and releases the first route transition configuration.

[0109] As shown in FIG. 9, the method further includes the following steps.

[0110] Step 905: if the random access fails, the IAB-node sends a transition failure indication to the child node, and the child node returns to the original path configuration and releases the second path transition configuration.

[0111] As shown in FIG. 9, the method further includes the following steps.

[0112] Step 906: If the random access fails, the IAB-node triggers an RRC re-establishment procedure.

[0113] Step 907: If the IAB-node has selected the DU to which the first candidate cell belongs and random access is successful, or if RRC re-establishment from the IAB-node to the DU to which the first candidate cell belongs is successful, send a second transition success indication to the child node.

[0114] According to step 907, the IAB-node may send a second transition success indication to the child node when re-establishing in the first candidate cell.

[0115] In step 907, the second transition success indication includes a cell identifier of the first candidate cell or an identifier of the DU to which the first candidate cell belongs.

[0116] According to the above method, when the IAB-node is re-established in the candidate cell after the handover failure, the child node may execute the second transition configuration, but it is determined based on whether the first candidate cell for the IAB-node and the second candidate cell for the child node are the same. For example, if the first candidate cell and the second candidate cell are the same, or if the DU to which the first candidate cell belongs and the DU to which the second candidate cell belongs are the same, it means that the child node holds the path configuration in the same candidate cell as the IAB-node, and the child node executes the second path transition configuration corresponding to the second candidate cell or the DU to which the second candidate cell belongs when receiving the second transition instruction. If the first candidate cell and the second candidate cell are different, or if the DU to which the first candidate cell belongs and the DU to which the second candidate cell belongs are different, it means that the child node does not have the path configuration in the same candidate cell as the IAB-node and cannot transition the path at the same time as the IAB-node, and the child node does not execute the second path transition configuration.

[0117] This allows the child node to perform accurate route transition when the IAB-node is re-established in a candidate cell after a handover failure, thereby enabling the IAB-node and the child node to perform route transition simultaneously and reducing service interruption time.

[0118] As shown in FIG. 9, the method further includes the following steps.

[0119] Step 908: If the random access fails, the IAB-node triggers an RRC re-establishment procedure.

[0120] Step 909: If the IAB-node selects a DU to which a cell other than the first candidate cell belongs and the RRC re-establishment is successful, it sends a re-establishment success indication to the child node.

[0121] According to step 909, the IAB-node may send a second transition success indication to the child node if it re-establishes to a cell other than the first candidate cell (e.g., the original cell, or another cell different from the first candidate cell and the original cell).

[0122] In step 909, the re-establishment success indication includes an identifier of a cell in which the IAB-node performs RRC re-establishment, or an identifier of a DU to which the cell in which the IAB-node performs RRC re-establishment belongs.

[0123] According to the above method, even if the IAB-node is re-established in a non-first candidate cell, the child node may execute the second transition configuration, but it is determined based on whether the re-establishment cell for the IAB-node and the second candidate cell for the child node are the same. For example, if the re-establishment cell and the second candidate cell are the same, or if the DU to which the re-establishment cell belongs and the DU to which the second candidate cell belongs are the same, it means that the child node holds the path configuration in the IAB-node re-establishment cell, and the child node executes the second path transition configuration corresponding to the second candidate cell or the DU to which the second candidate cell belongs when receiving the second transition instruction. If the re-establishment cell and the second candidate cell are different, or if the DU to which the re-establishment cell belongs and the DU to which the second candidate cell belongs are different, it means that the child node does not have the path configuration in the IAB-node re-establishment cell and cannot realize the transition path to the re-establishment cell, and the child node does not execute the second path transition configuration.

[0124] In this way, when the IAB-node is re-established in a non-candidate cell, the child node can realize route transition to the IAB-node re-established cell, so that after the IAB-node is successfully re-established, there is no need to configure a route in the child node, and the network can quickly update the network topology and reduce the service interruption time.

[0125] The signal transmitting and receiving method of FIG. 9 will be described below with reference to a specific embodiment.

[0126] Example 2 Example 2 is intended to explain the processing in the case where, when an IAB-node moves a DU in the same donor-CU or a different Donor-CU, an RRC message including a transition F1 transmission path configuration is sent to a child node of the IAB-node via the original path, i.e., before the handover of the IAB-node is completed, an RRC reconfiguration message is sent to the child node, and the handover of the IAB-node fails.

[0127] If the IAB-node handover fails (for example, T304 times out), it will fall back to the original cell configuration and select a new cell to perform RRC re-establishment, so the IAB-node in this case does not necessarily select the target cell and target Donor-DU to perform re-establishment. In order to reduce the service interruption delay, one response method is to also return the F1 transmission configuration of the child node to the original configuration. If the IAB-node handover fails, the IAB-node will send a handover failure indication to the child node, and if the child node has already applied the F1 transmission configuration of the target side, it will return to the original F1 transmission configuration, release the F1 transmission configuration of the target side, and wait for the Donor-CU to send a new F1 transmission configuration after the IAB-node re-establishment is completed.

[0128] Alternatively, to further reduce service interruption, when the IAB-node re-establishes in the original cell or the target cell, the child node performs an associated F1 transmission path transition. There are three scenarios:

[0129] Scenario 1: IAB-node handover fails and re-establishment to the target cell (i.e., the first candidate cell) Send a target cell re-establishment instruction to the child node, and if the child node has not yet applied the target-side F1 transmission configuration, have the child node perform target-side F1 transmission path transition and release the target-side F1 transmission path configuration, which can avoid the Donor-CU from sending an RRC reconfiguration message to the child node again, quickly establish a new network topology, and reduce service interruption.

[0130] Scenario 2: IAB-node handoff fails and re-establishes in original cell Send an original cell re-establishment instruction to the child node, and if the child node has already applied the target side's F1 transmission configuration, make the child node return to the original F1 transmission configuration, so that the network can return to the original topology as quickly as possible and reduce service interruptions.

[0131] Scenario 3: IAB handover fails and re-establishes to another cell The IAB-node sends a re-establishment instruction to the child node, and if the child node has already applied the F1 transmission configuration on the target side, it returns to the original F1 transmission configuration, releases the F1 transmission configuration on the target side, and waits for the Donor-CU to send a new F1 transmission configuration after the IAB-node re-establishment is completed. This allows the child node to return to the original topology, and for the Donor-CU to perform a new F1 transmission configuration after the IAB-node re-establishment is completed.

[0132] In addition, to prevent the IAB-node from being unable to complete the handover or re-establishment for a long time, the child node starts a timer after receiving the target side F1 transmission configuration. If the timer times out and no indication is received from the IAB-node, the child node reverts to the F1 transmission configuration of the original cell and triggers the RRC re-establishment of the child node. The timer configuration and the target side F1 transmission configuration may be sent to the child node via the same RRC reconfiguration message.

[0133] For other related contents in the specific aspect of the method shown in FIG. 9, reference may be made to the description of Example 1 in the second embodiment.

[0134] According to embodiment 3 of the present invention, when an IAB-node moves within or between Donor-CUs, the IAB-node and child nodes can simultaneously perform transmission path migration, thereby reducing the service interruption time during the path migration procedure.

[0135] <Embodiment 4> Regarding at least the same problem as in embodiment 3, embodiment 4 of the present invention provides a signal transmission / reception method corresponding to the method in embodiment 3. The signal transmission / reception method in embodiment 4 of the present invention is applied to a child node in a procedure in which an IAB-node controlled by a first donor aggregation unit (Donor-CU) transitions from a first distribution unit (DU) to a second DU.

[0136] Fig. 10 is a schematic diagram of an example of a signal transmission and reception method according to embodiment 4. As shown in Fig. 10, the method includes the following steps.

[0137] Step 1001: A child node of an IAB-node receives one or more second path transition configurations for the child node sent by a first Donor-CU, where the second path transition configurations correspond to a second candidate cell of the IAB-node or a DU to which the second candidate cell of the IAB-node belongs.

[0138] As shown in FIG. 10, the method further includes the following steps.

[0139] Step 1002: The child node receives a first transition success indication sent when the random access initiated by the IAB-node to the first candidate cell is successful.

[0140] Step 1003: The child node performs a second path transition configuration corresponding to the second candidate cell or the DU to which the second candidate cell belongs.

[0141] In step 1002, the first transition success indication includes a cell identifier of the first candidate cell or an identifier of a DU to which the first candidate cell belongs.

[0142] In step 1003, if the first candidate cell and the second candidate cell are the same, or if the DU to which the first candidate cell belongs and the DU to which the second candidate cell belongs are the same, the child node performs a second path transition configuration corresponding to the second candidate cell or the DU to which the second candidate cell belongs.

[0143] Furthermore, if the first candidate cell and the second candidate cell are different, or if the DU to which the first candidate cell belongs and the DU to which the second candidate cell belongs are different, the child node returns to the original route configuration and releases the second route transition configuration.

[0144] As a result, when the IAB-node has routes configured for multiple candidate cells, if the IAB-node's route transition is successful, the child nodes can simultaneously transition their routes according to the cells transitioned by the IAB-node, thereby reducing the service interruption time.

[0145] As shown in FIG. 10, the method further includes the following steps.

[0146] Step 1004: The child node receives a transition failure indication sent when the random access initiated by the IAB-node to the first candidate cell fails.

[0147] Step 1005: The child node returns to the original path configuration and releases the second path transition configuration.

[0148] As a result, if the IAB-node initiates random access to the first candidate cell and fails, the child node reverts to the original route configuration and releases the second route transition configuration.

[0149] As shown in FIG. 10, the method further includes the following steps.

[0150] Step 1006: The child node receives a second migration success indication.

[0151] Step 1007: The child node executes a second path transition configuration corresponding to the second candidate cell, and releases the original path configuration.

[0152] Here, the second transition success indication is sent by the IAB-node when the IAB-node selects the DU to which the first candidate cell belongs and performs RRC re-establishment, and random access is successful, or when RRC re-establishment from the IAB-node to the DU to which the first candidate cell belongs is successful. The second transition success indication means that the IAB-node is re-established to the first candidate cell.

[0153] In at least one embodiment, the second transition success indication includes a cell identifier of the first candidate cell or an identifier of a DU to which the first candidate cell belongs.

[0154] In step 1007, if the first candidate cell and the second candidate cell are the same, or if the DU to which the first candidate cell belongs and the DU to which the second candidate cell belongs are the same, the child node performs a second path transition configuration corresponding to the second candidate cell or the DU to which the second candidate cell belongs.

[0155] Furthermore, if the first candidate cell and the second candidate cell are different, or if the DU to which the first candidate cell belongs and the DU to which the second candidate cell belongs are different, the child node returns to the original route configuration and releases the second route transition configuration.

[0156] This allows the child node to perform accurate route transition when the IAB-node handover fails and is re-established in a candidate cell, enabling the IAB-node and child node to perform route transition simultaneously, thereby reducing service interruption time.

[0157] As shown in FIG. 10, the method further includes the following steps.

[0158] Step 1008: The child node receives a re-establishment success indication.

[0159] Step 1009: The child node performs a second path transition configuration corresponding to the second candidate cell or the DU to which the second candidate cell belongs.

[0160] Here, the re-establishment success indication is sent by the IAB-node when the IAB-node selects a DU to which a cell other than the first candidate cell belongs to perform RRC re-establishment and the RRC re-establishment is successful. The cell other than the first candidate cell may be the original cell, or another cell different from the first candidate cell and the original cell.

[0161] The re-establishment success indication includes an identifier of a cell for which the IAB-node performs RRC re-establishment, or an identifier of a DU to which the cell for which the IAB-node performs RRC re-establishment belongs.

[0162] In step 1009, if the cell for which the IAB-node performs RRC re-establishment is the same as the second candidate cell, or if the DU to which the cell for which the IAB-node performs RRC re-establishment belongs is the same as the DU to which the second candidate cell belongs, the child node executes a second path transition configuration corresponding to the second candidate cell or the DU to which the second candidate cell belongs.

[0163] In addition, if the cell in which the IAB-node performs RRC re-establishment is different from the second candidate cell, or if the DU to which the cell in which the IAB-node performs RRC re-establishment belongs is different from the DU to which the second candidate cell belongs, the child node returns to the original route configuration and releases the second route transition configuration.

[0164] As a result, when the IAB-node is re-established in a non-candidate cell, the child node can realize route transition to the IAB-node re-established cell; thus, after the IAB-node is successfully re-established, there is no need to configure a route in the child node, allowing the network to quickly update the network topology and reducing the service interruption time.

[0165] For other related contents in the specific aspect of the method shown in FIG. 10, reference may be made to the descriptions of Example 1 in the second embodiment and Example 2 in the third embodiment.

[0166] According to embodiment 4 of the present invention, when an IAB-node moves within a Donor-CU or between Donor-CUs, the IAB-node and child nodes can simultaneously migrate the transmission path, thereby shortening the service interruption time during the path migration procedure.

[0167] <Embodiment 5> An embodiment of the present invention provides a signal transmission and reception device, which is applied to a procedure in which an IAB-node controlled by a first Donor Aggregation Unit (Donor-CU) transitions from a first Distributed Unit (DU) to a second DU. The device may be the first Donor-CU, or may be an element or component configured in the first Donor-CU. The device corresponds to the method of embodiment 1.

[0168] 11 is a schematic diagram of an example of a signal transmission / reception device according to an embodiment of the present invention. As shown in FIG. 11, a signal transmission / reception device 1100 includes a first processing unit 1101.

[0169] The first processing unit is configured to control the transmission of one or more first path transition configurations for an access backhaul integrated node (IAB-node) to the IAB-node, and the transmission of one or more second path transition configurations for a child node of the IAB-node to the child node.

[0170] Here, the first path transition configuration corresponds to a first candidate cell of the IAB-node or a DU to which the first candidate cell of the IAB-node belongs, and the second path transition configuration corresponds to a second candidate cell of the IAB-node or a DU to which the second candidate cell of the IAB-node belongs.

[0171] In at least one embodiment, when the second DU belongs to a second Donor-CU, the first processing unit is configured to control the first Donor-CU to send one or more first route transition requests for the IAB-node to the second Donor-CU, the first Donor-CU to receive one or more first route transition configurations for the IAB-node from the second Donor-CU, the first Donor-CU to send one or more second route transition requests for child nodes of the IAB-node to the second Donor-CU, and the first Donor-CU to receive one or more second route transition configurations for child nodes of the IAB-node from the second Donor-CU.

[0172] Here, the first route change request corresponds to a first candidate cell of the IAB-node, and the second route change request corresponds to a second candidate cell of the IAB-node.

[0173] Here, the first path change request includes at least a cell identifier of a first candidate cell of the IAB-node, and the second path change request includes at least a cell identifier of a second candidate cell of the IAB-node.

[0174] Here, the first path transition configuration and the second path transition configuration include at least one parameter among an IP address routable to the DU to which the first candidate cell belongs, a routing identifier (Routing ID), a radio link control channel identifier (RLC channel ID), and a new backhaul adaptation protocol (BAP) address.

[0175] In at least one embodiment, the first Donor-CU sends a first route transition request for the IAB-node via a handover request message or a secondary node addition request message, and the first Donor-CU receives the first route transition configuration for the IAB-node via a handover request response message or a secondary node addition request response message.

[0176] In at least one embodiment, the first Donor-CU sends a second path transition request for the child node via a handover request message or a secondary node addition request message, or sends a second path transition request for the child node via a path transition request message. The first Donor-CU receives a second path transition configuration for the IAB-node's child node via a handover request response message or a secondary node addition request response message, or receives a second path transition configuration for the child node via a path transition request response message.

[0177] In at least one embodiment, the first processing unit is configured to control the first Donor-CU to configure an IAB-node candidate cell identifier or a DU identifier to which the IAB-node candidate cell belongs, corresponding to one or more first path transition configurations for the IAB-node, in an RRC message and send it to the IAB-node, and the first Donor-CU to configure an IAB-node candidate cell identifier or a DU identifier to which the IAB-node candidate cell belongs, corresponding to one or more second path transition configurations for the child node, in an RRC message and send it to the child node.

[0178] In at least one embodiment, the first Donor-CU sending a second route transition configuration for the child node to the child node includes the first Donor-CU sending the second route transition configuration to the child node before the IAB-node performs the route transition.

[0179] In at least one embodiment, the first processing unit is configured to control a first Donor-CU to set an execution condition corresponding to the second route transition configuration, transmit the execution condition to the child node, and control the child node to execute the second route transition configuration when the execution condition is satisfied.

[0180] In at least one embodiment, the first processing unit is configured to control a first Donor-CU to set an execution condition corresponding to the first route transition configuration, transmit the execution condition to the IAB-node, and control the IAB-node to execute the first route transition configuration when the execution condition is satisfied.

[0181] <Embodiment 6> An embodiment of the present invention provides a signal transmission and reception device, which is applied to a procedure in which an IAB-node controlled by a first Donor Aggregation Unit (Donor-CU) transitions from a first Distributed Unit (DU) to a second DU. The device may be the second Donor-CU, or may be an element or component configured in the second Donor-CU. The device corresponds to the method of embodiment 2.

[0182] 12 is a schematic diagram of an example of a signal transmission / reception device according to embodiment 6. As shown in FIG.

[0183] The second processing unit 1201 is configured to control the second Donor-CU to receive one or more first route transition requests for an access backhaul integration node (IAB-node) from the first Donor-CU, and to send one or more first route transition configurations for the IAB-node to the first Donor-CU, and to control the second Donor-CU to receive one or more second route transition requests for a child node of the IAB-node from the first Donor-CU, and to send one or more second route transition configurations for the child node of the IAB-node to the first Donor-CU.

[0184] Here, the first route change request corresponds to a first candidate cell of the IAB-node, the second route change request corresponds to a second candidate cell of the IAB-node, the first route change configuration corresponds to the first candidate cell of the IAB-node or the DU to which the first candidate cell belongs, and the second route change configuration corresponds to the second candidate cell of the IAB-node or the DU to which the second candidate cell belongs.

[0185] In at least one embodiment, the first path transition request includes at least a cell identifier of a first candidate cell of the IAB-node, the second path transition request includes at least a cell identifier of a second candidate cell of the IAB-node, and the first path transition configuration and the second path transition configuration include at least one parameter of an IP address routable to a DU to which the first candidate cell belongs, a routing identifier (Routing ID), a Radio Link Control channel identifier (RLC channel ID), and a new Backhaul Adaptation Protocol (BAP) address.

[0186] In at least one embodiment, the second Donor-CU receives a first route transition request for the IAB-node via a handover request message or a secondary node addition request message, and the second Donor-CU sends a first route transition configuration for the IAB-node via a handover request response message or a secondary node addition request response message.

[0187] In at least one embodiment, the second Donor-CU receives a second path transition request for the child node via a handover request message or a secondary node addition request message, or receives a second path transition request for the child node via a path transition request message. The second Donor-CU sends a second path transition configuration for the IAB-node's child node via a handover request response message or a secondary node addition request response message, or sends a second path transition configuration for the child node via a path transition request response message.

[0188] According to embodiment 5 of the present invention, the first Donor-CU can send the first route transition configuration and the second route transition configuration to the IAB-node and the child node of the IAB-node, respectively, thereby facilitating the transition of the transmission route by the IAB-node and the child node, and updating the network topology.

[0189] <Embodiment 7> An embodiment of the present invention provides a signal transmission and reception device, which is applied to a procedure in which an IAB-node controlled by a first donor aggregation unit (Donor-CU) transitions from a first distribution unit (DU) to a second DU. The device may be an IAB-node, or an element or component configured in the IAB-node. The device corresponds to the method of embodiment 3.

[0190] 13 is a schematic diagram of an example of a signal transmission / reception device according to embodiment 7. As shown in FIG.

[0191] The third processing unit 1301 is configured to control the IAB-node to receive one or more first route transition configurations for the IAB-node transmitted by a first Donor-CU, the first route transition configuration corresponding to a first candidate cell of the IAB-node or a DU to which the first candidate cell of the IAB-node belongs, and when an execution condition of the first route transition configuration is satisfied, to execute the first route transition configuration and initiate random access to the first candidate cell corresponding to the first route transition configuration.

[0192] In at least one embodiment, if the random access is successful, the IAB-node sends a first transition success indication to the child node.

[0193] In at least one embodiment, the first transition success indication includes a cell identifier of the first candidate cell or an identifier of a DU to which the first candidate cell belongs.

[0194] In at least one embodiment, the third processing unit is configured to control the IAB-node to return to the original route configuration and release the first route transition configuration if the random access fails.

[0195] In at least one embodiment, if random access fails, the third processing unit is configured to control the IAB-node to send a transition failure indication to the child node, and the child node to return to the original route configuration and release the second route transition configuration.

[0196] In at least one embodiment, if random access fails, the third processing unit is configured to control the IAB-node to trigger an RRC re-establishment procedure, and to send a second transition success indication to the child node if the IAB-node selects the DU to which the first candidate cell belongs and the random access is successful, or if RRC re-establishment from the IAB-node to the DU to which the first candidate cell belongs is successful.

[0197] In at least one embodiment, the second transition success indication includes a cell identifier of the first candidate cell or an identifier of a DU to which the first candidate cell belongs.

[0198] In at least one embodiment, if random access fails, the third processing unit is configured to control the IAB-node to trigger an RRC re-establishment procedure, and if the IAB-node selects a DU to which a cell other than the first candidate cell belongs and the RRC re-establishment is successful, to send a re-establishment success indication to the child node.

[0199] In at least one embodiment, the re-establishment success indication includes an identifier of a cell for which the IAB-node performs RRC re-establishment, or an identifier of a DU to which the cell for which the IAB-node performs RRC re-establishment belongs.

[0200] <Embodiment 8> An embodiment of the present invention provides a signal transmission and reception device, which is applied to a procedure in which an IAB-node controlled by a first donor aggregation unit (Donor-CU) transitions from a first distribution unit (DU) to a second DU. The device may be a child node of the IAB-node, or an element or component configured in the child node. The device corresponds to the method of embodiment 4.

[0201] 14 is a schematic diagram of an example of a signal transmission / reception device according to embodiment 8. As shown in FIG.

[0202] The fourth processing unit 1401 is configured to control a child node of the IAB-node to receive one or more second path transition configurations for the child node sent by the first Donor-CU, where the second path transition configurations correspond to a second candidate cell of the IAB-node or a DU to which the second candidate cell of the IAB-node belongs.

[0203] In at least one embodiment, the fourth processing unit 1401 is configured to receive a first transition success indication transmitted when the random access initiated by the IAB-node to the first candidate cell is successful, and control the child node to execute a second path transition configuration corresponding to the second candidate cell or a DU to which the second candidate cell belongs.

[0204] In at least one embodiment, the first transition success indication includes a cell identifier of the first candidate cell or an identifier of a DU to which the first candidate cell belongs.

[0205] In at least one embodiment, if the first candidate cell and the second candidate cell are the same, or if the DU to which the first candidate cell belongs and the DU to which the second candidate cell belongs are the same, the child node performs a second path transition configuration corresponding to the second candidate cell or the DU to which the second candidate cell belongs.

[0206] In at least one embodiment, the fourth processing unit 1401 is configured to control the child node to return to the original route configuration and release the second route transition configuration when the first candidate cell and the second candidate cell are different, or when the DU to which the first candidate cell belongs and the DU to which the second candidate cell belongs are different.

[0207] In at least one embodiment, the fourth processing unit 1401 is configured to receive a transition failure indication transmitted when the random access initiated by the IAB-node to the first candidate cell by the child node fails, and to control the child node to return to the original route configuration and release the second route transition configuration.

[0208] In at least one embodiment, the fourth processing unit 1401 is configured to control the child node to receive a second transition success indication, and to control the child node to execute a second route transition configuration corresponding to the second candidate cell, and release the original route configuration.

[0209] Here, the second transition success instruction is transmitted by the IAB-node when the IAB-node selects the DU to which the first candidate cell belongs and performs RRC re-establishment and random access is successful, or when RRC re-establishment from the IAB-node to the DU to which the first candidate cell belongs is successful.

[0210] In at least one embodiment, the second transition success indication includes a cell identifier of the first candidate cell or an identifier of a DU to which the first candidate cell belongs.

[0211] In at least one embodiment, if the first candidate cell and the second candidate cell are the same, or if the DU to which the first candidate cell belongs and the DU to which the second candidate cell belongs are the same, the child node performs a second path transition configuration corresponding to the second candidate cell or the DU to which the second candidate cell belongs.

[0212] In at least one embodiment, the fourth processing unit 1401 is configured to control the child node to return to the original route configuration and release the second route transition configuration when the first candidate cell and the second candidate cell are different, or when the DU to which the first candidate cell belongs and the DU to which the second candidate cell belongs are different.

[0213] In at least one embodiment, the fourth processing unit 1401 is configured to control the child node to receive a successful re-establishment indication, and to return the child node to the original route configuration and release the second route transition configuration.

[0214] Here, the re-establishment success indication is sent by the IAB-node when the IAB-node selects a DU to which a cell other than the first candidate cell belongs and performs RRC re-establishment, and the RRC re-establishment is successful.

[0215] In at least one embodiment, the re-establishment success indication includes an identifier of a cell for which the IAB-node performs RRC re-establishment, or an identifier of a DU to which the cell for which the IAB-node performs RRC re-establishment belongs.

[0216] In at least one embodiment, if the cell for which the IAB-node performs RRC re-establishment is the same as the second candidate cell, or if the DU to which the cell for which the IAB-node performs RRC re-establishment belongs is the same as the DU to which the second candidate cell belongs, the child node executes a second path transition configuration corresponding to the second candidate cell or the DU to which the second candidate cell belongs.

[0217] In at least one embodiment, the fourth processing unit 1401 is configured to control the child node to return to the original route configuration and release the second route transition configuration when the cell in which the IAB-node performs RRC re-establishment is different from the second candidate cell, or when the DU to which the cell in which the IAB-node performs RRC re-establishment belongs is different from the DU to which the second candidate cell belongs.

[0218] <Embodiment 5> The embodiment of the present invention further provides a communication system, which may be referred to in FIG.

[0219] In some embodiments, the communication system may include a first donor aggregation unit (Donor-CU) including a signal transceiver 1100 as described in embodiment 5, and an access backhaul integrated node including a signal transceiver 1300 as described in embodiment 7.

[0220] Here, the access backhaul integrated node (IAB-node) may include an IAB-MT functional unit and an IAB-DU functional unit. Here, the IAB-MT functional unit may have a configuration similar to that of a terminal device. The IAB-DU functional unit and the donor aggregation unit (IAB-donor CU) may have units similar to those of a network device.

[0221] Fig. 15 is a schematic diagram of a configuration of a network device according to an embodiment of the present invention. As shown in Fig. 15, the network device 1500 may include a processor 1510 (e.g., a central processing unit CPU) and a memory 1520. The memory 1520 is connected to the processor 1510. The memory 1520 may store various data, and further stores an information processing program 1530, and executes the program 1530 under the control of the processor 1510.

[0222] For example, the processor 1510 may be configured to execute a program for implementing the method performed by the IAB-DU in the first embodiment or the IAB-donor CU in the second embodiment.

[0223] Also, as shown in Fig. 15, the network device 1500 may further include a transceiver 1540 and an antenna 1550. Here, the functions of the above units are the same as those of the conventional technology, and the description thereof will be omitted here. It is not necessary for the network device 1500 to include all the units shown in Fig. 15. Also, the network device 1500 may further include units not shown in Fig. 15, and may refer to the conventional technology.

[0224] FIG. 16 is a schematic diagram of a terminal device according to an embodiment of the present invention. As shown in FIG. 16, the terminal device 1600 may include a processor 1610 and a memory 1620. The memory 1620 stores data and programs and is connected to the processor 1610. Note that this figure is exemplary, and other types of structures may be used to supplement or replace this structure to realize communication functions or other functions. For example, the processor 1610 may be configured to execute a program for implementing the method performed by the IAB-MT in the first embodiment.

[0225] As shown in Fig. 16, the terminal device 1600 may further include a communication module 1630, an input unit 1640, a display 1650, and a power source 1660. Here, the functions of the above units are similar to those of the prior art, and the description thereof will be omitted here. It is not necessary for the terminal device 1600 to include all the units shown in Fig. 16. In addition, the terminal device 1600 may further include units not shown in Fig. 16, and may refer to the prior art.

[0226] The communication system may also include a second Donor-CU and a child node, the second Donor-CU may include the signal transmission / reception device 1200 described in embodiment 6, and the child node may include the signal transmission / reception device 1400 described in embodiment 8.

[0227] In an embodiment of the present invention, a computer program is further provided, which, when executed in a Donor CU, causes the Donor CU to perform the method according to embodiment 1 or embodiment 2.

[0228] An embodiment of the present invention further provides a storage medium having a computer program stored therein, the storage medium causing the Donor CU to perform the method according to embodiment 1 or embodiment 2 when the computer program is executed.

[0229] In an embodiment of the present invention, there is further provided a computer program, which, when executed in an IAB, causes the IAB to perform the method according to embodiment 3.

[0230] An embodiment of the present invention further provides a storage medium having a computer program stored thereon, the computer program, when executed, causing the IAB to perform the method according to embodiment 3.

[0231] An embodiment of the present invention further provides a computer program, which, when executed in a child node, causes the child node to perform the method according to embodiment 4.

[0232] An embodiment of the present invention further provides a storage medium having a computer program stored thereon, the computer program, when executed, causing a child node to perform the method according to embodiment 4.

[0233] The above-mentioned apparatus and method of the present invention may be realized by hardware or by a combination of hardware and software.The present invention relates to a computer readable program which, when executed by a logic unit, causes the logic unit to realize the above-mentioned apparatus or components, or to realize the above-mentioned various methods or steps.The present invention relates to a storage medium for storing the above-mentioned program, such as a hard disk, a magnetic disk, an optical disk, a DVD, a flash memory, etc.

[0234] Each processing method in each device described with reference to the embodiments of the present invention may be implemented by hardware, a software module executed by a processor, or a combination of both. For example, one or more of the functional block diagrams shown in the drawings, or one or more combinations of the functional block diagrams, may correspond to each software module in a computer program flow, or each hardware module. These software modules may correspond to each step shown in the drawings. These hardware modules may be realized by implementing these software modules in hardware, for example, using a field programmable gate array (FPGA).

[0235] The software module may be located in a RAM memory, a flash memory, a ROM memory, an EPROM memory, an EEPROM memory, a register, a hard disk, a mobile hard disk, a CD-ROM, or any other form of storage medium known to those skilled in the art. The storage medium may be connected to the processor such that the processor reads information from and / or writes information to the storage medium, or the storage medium may be a component of the processor. The processor and the storage medium may be located in an ASIC. The software module may be stored in the memory of the mobile terminal, or in a memory card inserted in the mobile terminal. For example, if the device (e.g., a mobile terminal) uses a MEGA-SIM card or a large capacity flash memory device with a relatively large capacity, the software module may be stored in the MEGA-SIM card or the large capacity flash memory device.

[0236] One or more of the functional blocks and / or one or more combinations of functional blocks in the functional block diagrams illustrated in the drawings may be implemented with 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, a discrete gate or transistor logic device, a discrete hardware component, or any suitable combination thereof to perform the functions described herein. One or more of the functional blocks and / or one or more combinations of functional blocks in the functional block diagrams illustrated in the drawings may be implemented with, for example, a combination of computing devices, such as a combination of a DSP and a microprocessor, a combination of multiple microprocessors, one or more microprocessors in combination with a DSP communication, or any other configuration.

[0237] Although the present invention has been described above with reference to specific embodiments, the above description is merely illustrative and does not limit the scope of protection of the present invention. Various modifications and changes may be made to the present invention without departing from the spirit and principles of the present invention, and these modifications and changes are also within the scope of the present invention.

[0238] Furthermore, the following supplementary notes are disclosed regarding the embodiments including the above-mentioned examples.

[0239] First Donor-CU method: (Appendix 1) A signal transmission and reception method applied to a procedure in which an IAB-node controlled by a first donor aggregation unit (Donor-CU) transitions from a first distribution unit (DU) to a second DU, the method comprising: The first Donor-CU sends one or more first route transition configurations for an access backhaul integration node (IAB-node) to the IAB-node; The first Donor-CU sends one or more second route transition configurations for a child node of the IAB-node to the child node; The method, wherein the first path transition configuration corresponds to a first candidate cell of the IAB-node or a DU to which the first candidate cell of the IAB-node belongs, and the second path transition configuration corresponds to a second candidate cell of the IAB-node or a DU to which the second candidate cell of the IAB-node belongs. (Appendix 2) If the second DU belongs to a second Donor-CU, the method includes: the first Donor-CU sending one or more first route transition requests for the IAB-node to the second Donor-CU; the first Donor-CU receiving one or more first route transition configurations for the IAB-node from the second Donor-CU; The first Donor-CU sends one or more second route transition requests for the child nodes of the IAB-node to the second Donor-CU; The first Donor-CU receives one or more second route transition configurations for child nodes of the IAB-node from the second Donor-CU; 2. The method of claim 1, wherein the first route change request corresponds to a first candidate cell of the IAB-node, and the second route change request corresponds to a second candidate cell of the IAB-node. (Appendix 3) The first route change request includes at least a cell identifier of a first candidate cell of the IAB-node; The second route change request includes at least a cell identifier of a second candidate cell of the IAB-node; The method of claim 2, wherein the first path transition configuration and the second path transition configuration include at least one parameter of an IP address routable to a DU to which a first candidate cell belongs, a routing identifier (Routing ID), a radio link control channel identifier (RLC channel ID), and a new backhaul adaptation protocol (BAP) address. (Appendix 4) The first Donor-CU sends a first route transition request for the IAB-node via a handover request message or a secondary node addition request message; 3. The method of claim 2, wherein the first Donor-CU receives a first route transition configuration for the IAB-node via a handover request response message or a secondary node addition request response message. (Appendix 5) The first Donor-CU sends a second route transition request for the child node via a handover request message or a secondary node addition request message, or sends a second route transition request for the child node via a route transition request message; The method of claim 2, wherein the first Donor-CU receives a second route transition configuration for a child node of the IAB-node via a handover request response message or a secondary node addition request response message, or receives a second route transition configuration for the child node via a route transition request response message. (Appendix 6) The first Donor-CU configures a candidate cell identifier of the IAB-node or a DU identifier to which a candidate cell of the IAB-node belongs, corresponding to one or more first path transition configurations for the IAB-node, in an RRC message and transmits the RRC message to the IAB-node; The method of any one of Supplementary Notes 1 to 3, further comprising a step in which the first Donor-CU configures a candidate cell identifier of an IAB-node corresponding to one or more second path transition configurations for the child node or a DU identifier to which a candidate cell of the IAB-node belongs in an RRC message and transmits the RRC message to the child node. (Appendix 7) The step of the first Donor-CU sending a second route transition configuration for the child node to the child node includes: The method of any one of claims 1 to 3, further comprising a step in which the first Donor-CU sends the second route transition configuration to the child node before the IAB-node performs a route transition. (Appendix 8) The method of any one of appendixes 1 to 3, further comprising the steps of: a first Donor-CU setting an execution condition corresponding to the second route transition configuration, transmitting the execution condition to the child node, and the child node executing the second route transition configuration if the execution condition is satisfied. (Appendix 9) The method of any one of appendixes 1 to 3, further comprising the steps of: a first Donor-CU setting an execution condition corresponding to the first route transition configuration, transmitting the execution condition to the IAB-node, and the IAB-node executing the first route transition configuration if the execution condition is satisfied.

[0240] Second Donor-CU side method: (Appendix 1) A signal transmission / reception method applied to a procedure in which an IAB-node controlled by a first donor aggregation unit (Donor-CU) transitions from a first distribution unit (DU) to a second DU, comprising: A second Donor-CU receives one or more first route transition requests for an access backhaul integration node (IAB-node) from the first Donor-CU; the second Donor-CU sending to the first Donor-CU one or more first route transition configurations for the IAB-node; A second Donor-CU receives one or more second route transition requests for child nodes of the IAB-node from the first Donor-CU; the second Donor-CU sending to the first Donor-CU one or more second route transition configurations for child nodes of the IAB-node; The method, wherein the first path change request corresponds to a first candidate cell of the IAB-node, the second path change request corresponds to a second candidate cell of the IAB-node, the first path change configuration corresponds to the first candidate cell of the IAB-node or a DU to which the first candidate cell belongs, and the second path change configuration corresponds to a second candidate cell of the IAB-node or a DU to which the second candidate cell belongs. (Appendix 2) The first route change request includes at least a cell identifier of a first candidate cell of the IAB-node; The second route change request includes at least a cell identifier of a second candidate cell of the IAB-node; The method of claim 1, wherein the first path transition configuration and the second path transition configuration include at least one parameter of an IP address routable to a DU to which a first candidate cell belongs, a routing identifier (Routing ID), a radio link control channel identifier (RLC channel ID), and a new backhaul adaptation protocol (BAP) address. (Appendix 3) The second Donor-CU receives a first route transition request for the IAB-node via a handover request message or a secondary node addition request message; The method of claim 1, wherein the second Donor-CU sends a first route transition configuration for the IAB-node via a handover request response message or a secondary node addition request response message. (Appendix 4) The second Donor-CU receives a second route transition request for the child node via a handover request message or a secondary node addition request message, or receives a second route transition request for the child node via a route transition request message; The method of claim 1, wherein the second Donor-CU sends a second route transition configuration for a child node of the IAB-node via a handover request response message or a secondary node addition request response message, or sends a second route transition configuration for the child node via a route transition request response message.

[0241] IAB-node side: (Appendix 1) A signal transmission / reception method applied to a procedure in which an IAB-node transitions from a first distributed unit (DU) of a first Donor-CU to a second DU, comprising: receiving, by the IAB-node, one or more first path transition configurations for the IAB-node sent by a first Donor-CU, where the first path transition configurations correspond to a first candidate cell of the IAB-node or a DU to which the first candidate cell of the IAB-node belongs; When an execution condition of the first route transition configuration is satisfied, the IAB-node executes the first route transition configuration and initiates random access to a first candidate cell corresponding to the first route transition configuration; if the random access is successful, the IAB-node sends a first transition success indication to the child node. (Appendix 2) The method of claim 1, wherein the first transition success indication includes a cell identifier of the first candidate cell or an identifier of a DU to which the first candidate cell belongs. (Appendix 3) The method of claim 1, further comprising: if random access fails, the IAB-node returns to an original route configuration and releases the first route transition configuration. (Appendix 4) If random access fails, The method of claim 3, further comprising the step of the IAB-node sending a transition failure indication to the child node, the child node returning to an original route configuration, and releasing the second route transition configuration. (Appendix 5) If random access fails, the IAB-node triggering an RRC re-establishment procedure; The method of claim 3, further comprising the step of: sending a second transition success indication to the child node when the IAB-node selects the DU to which the first candidate cell belongs and random access is successful, or when RRC re-establishment from the IAB-node to the DU to which the first candidate cell belongs is successful. (Appendix 6) The method of claim 5, wherein the second transition success indication includes a cell identifier of the first candidate cell or an identifier of a DU to which the first candidate cell belongs. (Appendix 7) If random access fails, the IAB-node triggering an RRC re-establishment procedure; The method of claim 3, further comprising the step of: if the IAB-node selects a DU to which a cell other than the first candidate cell belongs and RRC re-establishment is successful, sending a re-establishment success indication to the child node. (Appendix 8) The method according to claim 7, wherein the re-establishment success indication includes an identifier of a cell in which the IAB-node performs RRC re-establishment, or an identifier of a DU to which a cell in which the IAB-node performs RRC re-establishment belongs.

[0242] On the child node: (Appendix 1) A signal transmission / reception method applied to a procedure in which an IAB-node controlled by a first donor aggregation unit (Donor-CU) transitions from a first distribution unit (DU) to a second DU, comprising: a step of receiving, by a child node of the IAB-node, one or more second path transition configurations for the child node sent by the first Donor-CU, where the second path transition configurations correspond to a second candidate cell of the IAB-node or a DU to which the second candidate cell of the IAB-node belongs; receiving, by the child node, a first transition success indication sent when the random access initiated by the IAB-node to the first candidate cell is successful; and the child node performing a second path transition configuration corresponding to the second candidate cell or a DU to which the second candidate cell belongs. (Appendix 2) The method of claim 1, wherein the first transition success indication includes a cell identifier of the first candidate cell or an identifier of a DU to which the first candidate cell belongs. (Appendix 3) The method of supplementary note 2, wherein when the first candidate cell and the second candidate cell are the same, or when the DU to which the first candidate cell belongs and the DU to which the second candidate cell belongs are the same, the child node performs a second path transition configuration corresponding to the second candidate cell or the DU to which the second candidate cell belongs. (Appendix 4) The method of Supplementary Note 2, further comprising a step of the child node returning to an original route configuration and releasing the second route transition configuration when the first candidate cell is different from the second candidate cell, or when the DU to which the first candidate cell belongs is different from the DU to which the second candidate cell belongs. (Appendix 5) receiving, by the child node, a transition failure indication sent when a random access initiated by the IAB-node to a first candidate cell fails; The method of claim 1, further comprising the step of the child node returning to an original route configuration and releasing the second route transition configuration. (Appendix 6) receiving a second migration success indication at the child node; The child node performs a second path transition configuration corresponding to the second candidate cell, and releases the original path configuration; The method according to claim 1, wherein the second transition success instruction is transmitted by the IAB-node when the IAB-node selects the DU to which the first candidate cell belongs and performs RRC re-establishment and random access is successful, or when RRC re-establishment from the IAB-node to the DU to which the first candidate cell belongs is successful. (Appendix 7) The method of claim 6, wherein the second transition success indication includes a cell identifier of the first candidate cell or an identifier of a DU to which the first candidate cell belongs. (Appendix 8) The method of claim 7, wherein, when the first candidate cell and the second candidate cell are the same, or when the DU to which the first candidate cell belongs and the DU to which the second candidate cell belongs are the same, the child node performs a second path transition configuration corresponding to the second candidate cell or the DU to which the second candidate cell belongs. (Appendix 9) The method of claim 8, further comprising a step of the child node returning to an original route configuration and releasing the second route transition configuration when the first candidate cell is different from the second candidate cell, or when the DU to which the first candidate cell belongs is different from the DU to which the second candidate cell belongs. (Appendix 10) receiving a successful re-establishment indication at the child node; the child node returning to the original path configuration and releasing the second path transition configuration; The method according to claim 1, wherein the re-establishment success indication is transmitted by the IAB-node when the IAB-node selects a DU to which a cell other than the first candidate cell belongs and performs RRC re-establishment, and the RRC re-establishment is successful. (Appendix 11) The method according to claim 10, wherein the re-establishment success indication includes an identifier of a cell in which the IAB-node performs RRC re-establishment, or an identifier of a DU to which a cell in which the IAB-node performs RRC re-establishment belongs. (Appendix 12) The method described in Supplementary Note 11, wherein, when the cell for which the IAB-node performs RRC re-establishment is the same as the second candidate cell, or when the DU to which the cell for which the IAB-node performs RRC re-establishment belongs is the same as the DU to which the second candidate cell belongs, the child node performs a second path transition configuration corresponding to the second candidate cell or the DU to which the second candidate cell belongs. (Appendix 13) The method of claim 11, further comprising a step of: when a cell in which the IAB-node performs RRC re-establishment is different from the second candidate cell, or when a DU to which a cell in which the IAB-node performs RRC re-establishment belongs is different from a DU to which the second candidate cell belongs, the child node returns to an original route configuration and releases the second route transition configuration.

Claims

1. A signal transmission / reception device applied to a procedure in which an IAB-node controlled by a first donor aggregation unit (Donor-CU) transitions from a first donor distribution unit (DU) to a second donor DU, the device being located in the first Donor-CU, the device including a memory and a processor connected to the memory, the processor comprising: Sending one or more first path transition configurations for an access backhaul integration node (IAB-node); configured to transmit one or more second path transition configurations for the child node; The first path transition configuration corresponds to a parent node to which a first candidate cell of the IAB-node belongs, and the second path transition configuration corresponds to a parent node to which a second candidate cell of the IAB-node belongs; If the second donor-DU belongs to a second Donor-CU, the processor: Sending one or more first route transition requests for the IAB-node to the second Donor-CU; receiving one or more first path transition configurations for the IAB-node from the second Donor-CU; Sending one or more second route transition requests for the child nodes of the IAB-node to the second Donor-CU; configured to receive one or more second path transition configurations for the child node from the second Donor-CU; The apparatus, wherein the first path transition request corresponds to the parent node to which the first candidate cell belongs, and the second path transition request corresponds to the parent node to which the second candidate cell belongs.

2. 2. The apparatus of claim 1, wherein the first path transition configuration and the second path transition configuration include at least one parameter of an IP address, a routing identifier (Routing ID), a radio link control channel identifier (RLC channel ID), and a new backhaul adaptation protocol (BAP) address anchored in the second donor DU.

3. The processor: The apparatus of claim 1 , configured to set an execution condition corresponding to the second path transition configuration, transmit the execution condition to the child node, and cause the child node to execute the second path transition configuration if the execution condition is satisfied.

4. The processor: Sending the second path transition request for the child node via a handover request message, an SN addition request message, or a transport transition request message; The apparatus of claim 1 , configured to receive the second path transition configuration for the child node via a handover response message, an SN addition response message, or a transport transition response message.

5. A signal transmission / reception device applied to a procedure in which an IAB-node transitions from a first donor distribution unit (DU) of a first Donor-CU to a second donor DU, the device being located in the IAB-node, the device including a memory and a processor connected to the memory, the processor: receiving one or more first path transition configurations for the IAB-node transmitted by the first Donor-CU, the first path transition configurations corresponding to parent nodes to which a first candidate cell of the IAB-node belongs; When an execution condition of the first route transition configuration is satisfied, the IAB-node executes the first route transition configuration and initiates random access to a first candidate cell corresponding to the first route transition configuration; The apparatus is configured such that, if the random access is successful, the IAB-node sends a first transition success indication to the child node.

6. The apparatus of claim 5 , wherein the first transition success indication includes a cell identifier of the first candidate cell or an identifier of a DU to which the first candidate cell belongs.

7. If the random access fails, the processor: The apparatus of claim 5 , configured to send a transition failure indication to the child node, causing the child node to revert to the original path configuration and release the second path transition configuration.

8. If the random access fails, the processor: Triggering an RRC re-establishment procedure; 6. The apparatus of claim 5, wherein the IAB-node selects the DU to which the first candidate cell belongs and, if random access is successful, or if RRC re-establishment from the IAB-node to the DU to which the first candidate cell belongs is successful, the apparatus is configured to send a second transition success indication to the child node.

9. The apparatus of claim 8 , wherein the second transition success indication includes a cell identifier of the first candidate cell or an identifier of a DU to which the first candidate cell belongs.

10. If the random access fails, the processor: Triggering an RRC re-establishment procedure; 6. The apparatus of claim 5, wherein, if the IAB-node selects a DU to which a cell other than the first candidate cell belongs and RRC re-establishment is successful, the IAB-node is configured to send an RRC re-establishment success indication to the child node.

11. The apparatus of claim 10, wherein the RRC re-establishment success indication includes an identifier of a cell in which the IAB-node performs RRC re-establishment, or an identifier of a DU to which the cell in which the IAB-node performs RRC re-establishment belongs.

12. A signal transmission / reception device applied to a procedure in which an IAB-node controlled by a first donor aggregation unit (Donor-CU) transitions from a first donor distribution unit (DU) to a second donor DU, the device being located in a child node of the IAB-node, the device including a memory and a processor connected to the memory, the processor: receiving one or more second path transition configurations for the child node transmitted by the first Donor-CU, the second path transition configurations corresponding to a parent node to which a second candidate cell of the IAB-node belongs; receiving a first transition success indication sent when the random access initiated by the IAB-node to the first candidate cell is successful; An apparatus configured to perform a second path transition configuration corresponding to a parent node to which the second candidate cell belongs.

13. The apparatus of claim 12 , wherein the first transition success indication includes a cell identifier of the first candidate cell or an identifier of a DU to which the first candidate cell belongs.

14. 14. The device of claim 13, wherein if the first candidate cell and the second candidate cell are the same, or if the DU to which the first candidate cell belongs and the DU to which the second candidate cell belongs are the same, the child node performs a second path transition configuration corresponding to the second candidate cell or the DU to which the second candidate cell belongs.

15. The processor: receiving a transition failure indication sent when a random access initiated by the IAB-node to a first candidate cell fails; The apparatus of claim 12 , configured to revert to an original path configuration and release the second path transition configuration.

16. The processor: receiving a second successful migration indication; configured to control to execute a second path transition configuration corresponding to the second candidate cell and release the original path configuration; The second transition success indication is transmitted by the IAB-node when the IAB-node selects the DU to which the first candidate cell belongs and performs RRC re-establishment and random access is successful, or when RRC re-establishment from the IAB-node to the DU to which the first candidate cell belongs is successful.

17. The apparatus of claim 16 , wherein the second transition success indication includes a cell identifier of the first candidate cell or an identifier of a DU to which the first candidate cell belongs.

18. The processor: receiving an RRC re-establishment success indication; configured to return to the original path configuration and release the second path transition configuration; The apparatus of claim 12, wherein the RRC re-establishment success indication is transmitted by the IAB-node when the IAB-node selects a DU to which a cell other than the first candidate cell belongs and performs RRC re-establishment, and the RRC re-establishment is successful.

19. The apparatus of claim 18, wherein the RRC re-establishment success indication includes an identifier of a cell in which the IAB-node performs RRC re-establishment, or an identifier of a DU to which the cell in which the IAB-node performs RRC re-establishment belongs.

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