A method and apparatus for notifying an inter-node wireless link state

Abstract

The embodiment of the application provides a method and device for notifying inter-node wireless link state, wherein the method applied to an IAB node comprises: in the case of IAB node wireless link failure recovery, determining whether a parent node connected to the IAB node can route data packets of a child node of the IAB node; and based on the determined result information, determining whether to send wireless link state information to the child node. The method for notifying inter-node wireless link state provided by the embodiment of the application determines whether to send wireless link state information to the child node according to whether the parent node connected to the IAB node can route data packets of the child node, so that the child node can obtain topology information in time, perform real-time topology adjustment, and solve the problem that data of the child node cannot be transmitted.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wireless communication, and in particular to a method and device for notifying inter-node wireless link state. BACKGROUND

[0002] In the existing mechanism, after an IAB node sends a BH radio link failure detection indication to a child node of the IAB node, if the radio link of the IAB node is recovered, the IAB node sends a BH radio link recovery indication to the child node. There is a risk in this mechanism. If the IAB node is reconnected to an IAB node or an IAB donor that cannot support its child node, the IAB node sends a radio link recovery to its child node after the radio link is recovered, which not only cannot recover the normal data transmission of the child node, but also delays the time for the child node to discover the anomaly. SUMMARY

[0003] To solve the problems in the prior art, embodiments of the present application provide a method and device for notifying inter-node wireless link state.

[0004] In a first aspect, the embodiments of the present application provide a method for notifying inter-node wireless link state, applied to an IAB node, comprising:

[0005] In the case that the radio link of the IAB node is recovered, determining whether a parent node connected to the IAB node can route data packets of a child node of the IAB node.

[0006] Based on the determined result information, determining whether to send radio link state information to the child node.

[0007] Optionally, according to the method for notifying inter-node wireless link state, the determining whether the parent node connected to the IAB node can route data packets of the child node of the IAB node comprises:

[0008] In the case that any of the following conditions is met, it is determined that the parent node connected to the IAB node can route data packets of the child node of the IAB node; the conditions include:

[0009] The IAB node is reconnected to the original parent IAB node before the radio link failure occurs;

[0010] The IAB node is reconnected to a parent IAB node of the same central control node distributed unit IAB donor DU as the original parent IAB node;

[0011] The IAB node is reestablished to a parent IAB node under a same central control node central unit IAB donor CU as the original parent IAB node, and the IAB node is capable of performing cross-IAB donor DU rerouting of data packets from the child node;

[0012] The IAB node is reestablished to a parent IAB node under a different central control node central unit IAB donor CU from the original parent IAB node, and the IAB node is capable of performing cross-IAB donor CU rerouting of data packets from the child node.

[0013] The IAB node is reestablished to an IAB donor DU accessed by the original parent IAB node.

[0014] The IAB node is reestablished to a different IAB donor DU of a same central control node central unit IAB donor CU as the original parent IAB node, and the IAB node is capable of performing cross-IAB donor DU rerouting of data packets from the child node.

[0015] The IAB node is reestablished to an IAB donor DU under a different central control node central unit IAB donor CU from the original parent IAB node, and the IAB node is capable of performing cross-IAB donor CU rerouting of data packets from the child node.

[0016] Optionally, in a case where the result information indicates that a parent node connected to the IAB node is capable of routing data packets of a child node of the IAB node, the method further includes determining, based on the determined result information, whether to send wireless link state information to the child node, including any one of the following:

[0017] sending a wireless link failure recovery indication message to the child node;

[0018] In a case where the routing reconfiguration information sent by the central control node IAB donor is acquired, sending the routing reconfiguration information to the child node.

[0019] Optionally, the method further includes:

[0020] sending a wireless link failure recovery indication message to the child node before the routing reconfiguration information sent by the central control node IAB donor is acquired; or

[0021] Before acquiring the routing reconfiguration information sent by the central control node IAB donor, no wireless link failure recovery indication message is sent to the child node.

[0022] Optionally, in the method for notifying the inter-node wireless link state according to an embodiment of the present application, in the case of acquiring the routing reconfiguration information sent by the central control node IAB donor, the routing reconfiguration information is sent to the child node, including:

[0023] In the case of the IAB node being reconstructed to an IAB donor DU accessed by the original parent IAB node, an IAB donor DU different from the original parent IAB node, and another parent IAB node different from the original parent IAB node, the IAB node waits for the routing reconfiguration information sent by the IAB donor;

[0024] In the case of acquiring the routing reconfiguration information sent by the central control node IAB donor, the routing reconfiguration information is sent to the child node.

[0025] Optionally, in the method for notifying the inter-node wireless link state according to an embodiment of the present application, the method further includes:

[0026] In the case of the IAB node being reconstructed to a parent IAB node of the same central control node central unit IAB donor CU as the original parent IAB node, a different IAB donor DU, or a parent IAB node under a central control node central unit IAB donor CU different from the original parent IAB node, a wireless link failure recovery failure indication message is sent to the child node; or

[0027] In the case of the IAB node being reconstructed to a parent IAB node of the same central control node central unit IAB donor CU as the original parent IAB node, a different IAB donor DU, or a parent IAB node under a central control node central unit IAB donor CU different from the original parent IAB node, no message is sent to the child node; or

[0028] In the case of the IAB node being reconstructed to another IAB donor DU of the same IAB donor CU as the original parent IAB node or an IAB donor DU under another IAB donor CU, a wireless link failure recovery failure indication message is sent to the child node; or

[0029] In a case where the IAB node is reestablished to an IAB donor DU or an IAB donor DU under another IAB donor CU of the same IAB donor CU as the original parent IAB node, no message is sent to the child node.

[0030] Optionally, the method for notifying the inter-node radio link state according to an embodiment of the present application further comprises:

[0031] In a case where the IAB node is reestablished to a parent IAB node of the same central control node central unit IAB donor CU and a different IAB donor DU as the original parent IAB node, and the IAB node is capable of inter-donor DU rerouting, the IAB node performs inter-donor DU rerouting on data packets from the child node.

[0032] In a case where the IAB node is reestablished to a parent IAB node under a different IAB donor CU from the original parent IAB node, and the IAB node is capable of inter-donor CU rerouting, the IAB node performs inter-donor CU rerouting on data packets from the child node.

[0033] In a case where the IAB node is reestablished to a parent IAB node of the same central control node central unit IAB donor CU and a different IAB donor DU as the original parent IAB node, and the IAB node is capable of inter-donor DU rerouting, the IAB node performs inter-donor DU rerouting on data packets from the child node.

[0034] In a case where the IAB node is reestablished to an IAB donor DU under a different central control node central unit IAB donor CU from the original parent IAB node, and the IAB node is capable of inter-donor CU rerouting, the IAB node performs inter-donor CU rerouting on data packets from the child node.

[0035] Optionally, the method for notifying the inter-node radio link state according to an embodiment of the present application, in a case where the determined result information is that the parent node connected by the IAB node is incapable of routing data packets of the child node of the IAB node, the method comprises any one of the following based on the result information, determining whether to send radio link state information to the child node:

[0036] sending a radio link failure recovery failure indication message to the child node;

[0037] not sending any message to the child node;

[0038] starting a first radio link failure recovery waiting timer, determining that the first radio link failure recovery waiting timer expires, sending a radio link failure recovery failure indication message to the child node, or starting the first radio link failure recovery waiting timer and not sending any message to the child node;

[0039] in a case that the routing reconfiguration information sent by the central control node IAB donor is acquired, sending the routing reconfiguration information to the child node.

[0040] Optionally, according to the method for notifying the inter-node radio link state, the parameter of the first radio link failure recovery waiting timer is a default value defined by a protocol or configured by an IAB donor to which an original parent IAB node accesses.

[0041] Optionally, according to the method for notifying the inter-node radio link state, the method further includes:

[0042] before the routing reconfiguration information sent by the central control node IAB donor is acquired, sending a radio link failure recovery indication message to the child node; or

[0043] before the routing reconfiguration information sent by the central control node IAB donor is acquired, not sending a radio link failure recovery indication message to the child node.

[0044] In a second aspect, an embodiment of the present application provides a method for notifying an inter-node radio link state, applied to a child node of an IAB node, and including:

[0045] after receiving a radio link failure detection indication message sent by the IAB node, receiving radio link state information sent by the IAB node, and determining whether to complete radio link recovery according to the radio link state information.

[0046] Optionally, according to the method for notifying the inter-node radio link state, the receiving the radio link state information sent by the IAB node includes:

[0047] receiving a radio link failure recovery indication message sent by the IAB node; or

[0048] receiving routing reconfiguration information sent by the IAB node; or

[0049] receiving a radio link failure recovery failure indication message sent by the IAB node.

[0050] Optionally, according to the method for notifying the inter-node wireless link state, before the receiving of the routing reconfiguration information sent by the IAB node, the method further comprises:

[0051] receiving a radio link failure recovery indication message sent by the IAB node.

[0052] Optionally, according to the method for notifying the inter-node wireless link state, the method further comprises:

[0053] starting a second radio link failure recovery waiting timer, and if the second radio link failure recovery waiting timer expires, no radio link failure recovery indication message or routing reconfiguration information sent by the IAB node is received, determining that the wireless link recovery fails.

[0054] Optionally, according to the method for notifying the inter-node wireless link state, a parameter of the second radio link failure recovery waiting timer is a default value specified by a protocol or configured by an IAB donor to which an original parent IAB node accesses.

[0055] In a third aspect, the embodiments of the present application further provide an IAB node device, comprising a memory, a transceiver and a processor.

[0056] The memory is configured to store a computer program; the transceiver is configured to transceive data under the control of the processor; and the processor is configured to read the computer program in the memory and implement the steps of the method for notifying the inter-node wireless link state according to the first aspect.

[0057] In a fourth aspect, the embodiments of the present application further provide a child node device of an IAB node, comprising a memory, a transceiver and a processor.

[0058] The memory is configured to store a computer program; the transceiver is configured to transceive data under the control of the processor; and the processor is configured to read the computer program in the memory and implement the steps of the method for notifying the inter-node wireless link state according to the second aspect.

[0059] In a fifth aspect, the embodiments of the present application further provide a device for notifying the inter-node wireless link state, which can be applied to an IAB node and comprises:

[0060] A determining unit is configured to determine whether a parent node connected to the IAB node can route data packets of a child node of the IAB node in the case of radio link failure recovery of the IAB node.

[0061] A sending unit is configured to determine whether to send wireless link state information to the child node based on the determined result information.

[0062] In a sixth aspect, the embodiments of the present application further provide a notification device for inter-node wireless link state, which can be applied to a child node of an IAB node, and comprises:

[0063] a receiving unit configured to receive wireless link state information sent by the IAB node after receiving a wireless link failure detection indication message sent by the IAB node, and determine whether to complete wireless link recovery according to the wireless link state information.

[0064] In a seventh aspect, the embodiments of the present application further provide a processor-readable storage medium, which stores a computer program, and the computer program is used to make the processor execute the steps of the inter-node wireless link state notification method according to the first aspect or the inter-node wireless link state notification method according to the second aspect.

[0065] The inter-node wireless link state notification method provided by the embodiments of the present application can determine whether to send wireless link state information to the child node by judging the parent IAB node connected to the IAB node after the wireless link failure recovery of the IAB node, and determining whether the parent node connected to the IAB node can route the data packet of the child node, so that the child node can obtain the topology information in time and make real-time topology adjustment, and the problem that the data of the child node cannot be transmitted due to the IAB node being connected to the parent node which cannot route the data of the child node and the child node mistakenly considering that the wireless link is recovered. BRIEF DESCRIPTION OF DRAWINGS

[0066] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort.

[0067] Figure 1 is an IAB network topology diagram provided by the present application;

[0068] Figure 2 is an IAB node relationship diagram provided by the present application;

[0069] Figure 3 is an IAB node wireless link recovery and its connection topology diagram with a child node provided by the present application;

[0070] Figure 4 is one of the flowcharts of the inter-node wireless link state notification method provided by the embodiments of the present application;

[0071] Figure 5is a schematic diagram of an IAB node topology provided by an embodiment of the present application;

[0072] Figure 6 is a second schematic diagram of a method for notifying an inter-node wireless link state provided by an embodiment of the present application;

[0073] Figure 7 is a schematic diagram of an IAB node device provided by an embodiment of the present application;

[0074] Figure 8 is a schematic diagram of a child node device of an IAB node provided by an embodiment of the present application;

[0075] Figure 9 is a first schematic diagram of a device for notifying an inter-node wireless link state provided by an embodiment of the present application;

[0076] Figure 10 is a second schematic diagram of a device for notifying an inter-node wireless link state provided by an embodiment of the present application. DETAILED DESCRIPTION

[0077] In the embodiments of the present application, the term "and / or" describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the following three cases: A exists alone, A and B exist together, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after it.

[0078] In the embodiments of the present application, the term "a plurality of" means two or more, and other quantifiers are similar.

[0079] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the scope of protection of the present application.

[0080] The technical solutions provided by the embodiments of the present application can be applied to various systems, especially 5G systems. For example, the applicable systems can be a global system of mobile communication (GSM) system, a code division multiple access (CDMA) system, a wideband code division multiple access (WCDMA) general packet radio service (GPRS) system, a long term evolution (LTE) system, an LTE frequency division duplex (FDD) system, an LTE time division duplex (TDD) system, a long term evolution advanced (LTE-A) system, a universal mobile system (UMTS), a worldwide interoperability for microwave access (WiMAX) system, a 5G new radio (NR) system, and the like. The various systems all include terminal devices and network devices. The system can also include a core network part, such as an evolved packet system (EPS), a 5G system (5GS), and the like.

[0081] The terminal device (e.g., UE) involved in the embodiments of the present application can refer to a device that provides voice and / or data connectivity for a user, a handheld device with a wireless connection function, or other processing devices connected to a wireless modem, etc. In different systems, the name of the terminal device can also be different, for example, in the 5G system, the terminal device can be called User Equipment (UE). The wireless terminal device can communicate with one or more core networks (CN) through a radio access network (RAN). The wireless terminal device can be a mobile terminal device, such as a mobile phone (or called "cellular" phone) and a computer with a mobile terminal device, for example, it can be a portable, pocket, handheld, computer built-in or vehicle-mounted mobile device, which exchanges language and / or data with the radio access network. For example, personal communication service (PCS) phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants (PDAs), etc. The wireless terminal device can also be called a system, a subscriber unit, a subscriber station, a mobile station, a mobile, a remote station, an access point, a remote terminal, an access terminal, a user terminal, a user agent, a user device, which is not limited in the embodiments of the present application.

[0082] The network device related to the embodiments of the present application can be a base station, which can include multiple cells serving terminals. According to different application scenarios, the base station can also be referred to as an access point, or can be a device in an access network that communicates with wireless terminal devices through one or more sectors over an air interface, or other names. The network device can be used to exchange received air frames and Internet Protocol (IP) packets as a router between wireless terminal devices and the rest of the access network, which can include an Internet Protocol (IP) communication network. The network device can also coordinate the management of the properties of the air interface. For example, the network device related to the embodiments of the present application can be a network device (Base Transceiver Station, BTS) in the Global System for Mobile Communications (GSM) or Code Division Multiple Access (CDMA), or a network device (NodeB) in Wide-band Code Division Multiple Access (WCDMA), or an evolved network device (evolutional Node B, eNB or e-NodeB) in a long term evolution (LTE) system, or a 5G base station (gNB) in a next generation system, or a home evolved Node B (HeNB), a relay node, a femto, a pico, etc. The embodiments of the present application are not limited. In some network structures, the network device can include a centralized unit (CU) node and a distributed unit (DU) node, and the centralized unit and the distributed unit can also be arranged geographically apart.

[0083] An IAB (Integrated Access and Backhaul) network is composed of an IAB donor (IAB host node or IAB central control node), an IAB node (IAB node), and a terminal. Figure 1 is an IAB network topology diagram provided by the present application, as Figure 1As shown, the IAB donor is used to connect the core network, return the information of the IAB node and the terminal to the core network, and transmit the information of the core network to the IAB node and the terminal. The IAB donor is also responsible for managing the IAB nodes and terminals in the entire IAB network. The IAB donor can be further divided into a CU (Central Unit) and a DU (Distributed Unit), and the IAB donor CU is responsible for network configuration, including routing configuration, channel mapping configuration, per-hop QoS parameter configuration, etc.

[0084] The IAB node is responsible for relaying the information and data of the terminal to the IAB donor (uplink) and relaying the information and data of the IAB donor to the terminal (downlink) through a wireless link (Uu interface). The IAB nodes are connected through a wireless link, and the IAB nodes and the IAB donor are connected through a wireless link. The IAB architecture can realize transmission through multiple hops, and there can be multiple paths to reach an IAB node or a terminal (for example Figure 1 As shown, IAB node 1 is the parent node of IAB node 2, and IAB node 3 is the child node of IAB node 2, and IAB node 3 is the grandchild node of IAB node 1. Figure 1

[0085] Figure 2 is the IAB node relationship diagram provided by the present application, as shown in Figure 2 As shown, in the IAB network topology, an IAB node is composed of two parts, one part is an IAB MT (IAB Mobile Termination), which is connected to the DU part of the donor or the upper IAB node; the other part is an IAB DU (IAB Distributed Unit), which is connected to the MT part of the terminal or the lower IAB node.

[0086] ​When the wireless link between the IAB node and its parent node fails, the IAB node needs to send a BH radio link failure detection indication (BH RLF detection indication), also known as type-2 RLF indication, to its child node, which can perform data rerouting and the like; after the wireless link between the IAB node and its parent node is restored, the IAB node can send a BH radio link recovery indication (BH RLF recovery indication), also known as type-3 RLF indication, to its child node, and then the child node resumes data transmission with the IAB node; if the IAB node fails to recover the wireless link, the IAB node sends a BH radio link recovery failure indication (BH RLF recovery failure indication), also known as type-4 RLF indication, to the child node, and then the child node confirms the BH RLF and initiates an RRC connection reestablishment procedure. The introduction of the BH radio link indication type is shown in Table 1. Take Figure 2 For example, when the wireless link between IAB2 and IAB1 fails, IAB2 initiates an RRC connection reestablishment procedure and sends a BH radio link failure detection indication to IAB3; if IAB2 recovers the wireless link (i.e., the IAB-MT of IAB2 successfully establishes an RRC connection with a cell under an IAB node or an IAB donor DU), IAB2 sends a BH radio link recovery indication to IAB3; if IAB2 fails to recover the wireless link (i.e., IAB2 cannot establish an RRC connection with any cell under an IAB node or an IAB donor DU), IAB2 sends a BH radio link recovery failure indication to IAB3.

[0087] Table 1. BH radio link indication type

[0088]

[0089] The existing mechanism is that after the IAB node sends a BH radio link failure detection indication to a child node, if the wireless link of the IAB node is recovered, the IAB node sends a BH radio link recovery indication to the child node. There is a risk in this mechanism. If the IAB node is reestablished to an IAB node or an IAB donor that cannot support its child node, the IAB node sends a radio link recovery indication to its child node after the wireless link is recovered, which not only cannot restore the normal data transmission of the child node, but also delays the time for the child node to discover the anomaly.

[0090] Figure 3 Fig. 1 is a schematic diagram of the IAB node radio link recovery and its connection topology with a child node provided by the present application, as shown in Figure 3As shown, IAB1 (may also be referred to as IAB node 1, the names of IAB2, IAB3, IAB4, IAB5 and IAB6 below are processed in the same way, and details are not repeated below) originally maintains an RRC connection with IAB2, and data between IAB5 and IAB donor is transmitted through the IAB2 and IAB1 path. If IAB1 is reestablished to IAB6 (belongs to the same IAB donor CU and the same IAB donor DU as IAB2), IAB6 can route data packets from IAB5; but if IAB1 is reestablished to IAB3 (belongs to the same IAB donor CU as IAB2 but different IAB donor DU), IAB3 cannot route data packets from IAB5; or IAB1 is reestablished to IAB4 (belongs to different IAB donor CU from IAB2), not only IAB4 cannot route data packets from IAB5, but also IAB donor CU2 cannot identify IAB5.

[0091] Figure 4 is one of the flowcharts of the notification method of the inter-node wireless link state provided by the embodiments of the present application, as shown in the figure, Figure 4 the method can be applied to an IAB node, and includes:

[0092] Step 100, in the case of IAB node radio link failure recovery, determining whether the parent node connected to the IAB node can route data packets of the child node of the IAB node;

[0093] Specifically, for IAB node radio link failure recovery, it refers to the case that the IAB node recovers the wireless link after the wireless link between the IAB node and its parent node fails, which can be that the IAB node is reestablished to the original parent node, or the IAB node is reestablished to a new parent node.

[0094] The parent node connected to the IAB node can be a parent IAB node or an IAB donor, and exemplarily, referring to Figure 1 Taking IAB node 2 as an example, in path 1 (IAB donor-IAB node1-IAB node2-UE), the parent node of IAB node 2 is a parent IAB node, that is, IAB node 1; in path 2 (IAB donor-IAB node2-UE), the parent node of IAB node 2 is an IAB donor.

[0095] For determining whether the parent node connected to the IAB node can route data packets of the child node of the IAB node, it refers to whether the parent node connected to the IAB node can serve the child node, that is, whether the whole link where the IAB node is located can route data packets of the child node.

[0096] In step 110, it is determined whether to send the wireless link state information to the child node based on the determined result information.

[0097] Specifically, the result information is based on a determination of whether the parent node connected to the IAB node can route the data packet of the child node of the IAB node, and it is determined whether to send the wireless link state information to the child node, so that the child node determines whether to resume data transmission based on whether the wireless link state information is received and the received wireless link state information.

[0098] The method for notifying the state of the inter-node wireless link provided by the embodiments of the present application determines whether to send the wireless link state information to the child node based on the determination of whether the parent node connected to the IAB node can route the data packet of the child node after the IAB node recovers from the wireless link failure, so that the child node can obtain the topology information in time and make real-time topology adjustment, and the problem of the child node being unable to transmit data due to the IAB node being connected to the parent node that cannot route the data of the child node and the child node mistakenly believing that the wireless link is recovered is solved.

[0099] Optionally, the determination of whether the parent node connected to the IAB node can route the data packet of the child node of the IAB node comprises:

[0100] In the case where any of the following conditions is met, it is determined that the parent node connected to the IAB node can route the data packet of the child node of the IAB node.

[0101] The conditions comprise:

[0102] The IAB node is reconnected to the original parent IAB node before the wireless link failure occurs;

[0103] The IAB node is reconnected to the parent IAB node of the same central control node distributed unit IAB donor DU as the original parent IAB node;

[0104] The IAB node is reconnected to the parent IAB node of the same central control node central unit IAB donor CU as the original parent IAB node but different IAB donor DU, and the IAB node can perform cross-IAB donor DU rerouting of the data packet from the child node;

[0105] The IAB node is reestablished to a parent IAB node under a central control node central unit IAB donor CU different from the original parent IAB node, and the IAB node can reroute data packets from the child node across the IAB donor CU;

[0106] The IAB node is reestablished to an IAB donor DU accessed by the original parent IAB node.

[0107] The IAB node is reestablished to an IAB donor DU of a central control node central unit IAB donor CU different from the original parent IAB node, and the IAB node can reroute data packets from the child node across the IAB donor DU.

[0108] The IAB node is reestablished to an IAB donor DU of a central control node central unit IAB donor CU different from the original parent IAB node, and the IAB node can reroute data packets from the child node across the IAB donor CU.

[0109] Exemplarily, Figure 5 is an IAB node topology diagram provided by the embodiments of the present application, as Figure 5 As shown in the figure, taking IAB node 1 as an example, the child node of IAB node 1 is IAB node 5, before the wireless link between IAB node 1 and its parent node fails, it is connected with IAB node 2 (the original parent IAB node), and IAB node 2 is connected with IAB donor DU11.

[0110] For the IAB node reestablished to the original parent IAB node before the wireless link failure, it means that the IAB node 1 is reestablished to the IAB node 2.

[0111] For the IAB node reestablished to the parent IAB node of the central control node distributed unit IAB donor DU same as the original parent IAB node, it means that the IAB node 1 is reestablished to the IAB node 6.

[0112] For the IAB node to be reconstructed to the parent IAB node of the same central control node central unit IAB donor CU as the original parent IAB node, different IAB donor DU, and the IAB node can reroute the data packets from the child node across the IAB donor DU, it means that the IAB node 1 is reconstructed to the IAB node 3, and the whole link where the IAB node 1 is located can route the data packets from the child node, that is, the IAB node can reroute the uplink data packets from the child IAB node, whose destination address is the BAP address of the original IAB donor DU, through the new IAB donor DU. Specifically, when the IAB node 1 receives the data packet from the child node IAB node 5, whose destination address is the BAP address of the original IAB donor DU (IAB donor DU11), the IAB node 1 can rewrite the destination address as the BAP address of the new IAB donor DU (IAB donor DU12); and after the new IAB donor DU (IAB donor DU12) receives the uplink data packet, it can correctly parse and deliver it to the IAB donor CU (IAB donor CU1).

[0113] For the IAB node to be reconstructed to the parent IAB node under the central control node central unit IAB donor CU different from the original parent IAB node, and the IAB node can reroute the data packets from the child node across the IAB donor CU, it means that the IAB node 1 is reconstructed to the IAB node 4, and the whole link where the IAB node 1 is located can route the data packets from the child node, that is, when the IAB node 1 receives the data packet from the child node IAB node 5, it can rewrite the original routing ID in the data packet to a new routing ID recognizable by the new IAB donor CU and the IAB donor DU, and the new IAB donor CU (IAB donor CU2) and the IAB donor DU (IAB donor DU2) can forward the data packet to the original IAB donor CU (IAB donor CU1) after receiving it.

[0114] For the IAB node to be reconstructed to the IAB donor DU accessed by the original parent IAB node, it means that the IAB node 1 is reconstructed to the IAB donor DU11. In this case, the destination address of the data packet from the child node IAB node 5 remains unchanged, which is the IAB donor DU11, and the IAB donor DU11 can recognize the data packet from the IAB node 5 and send it to the IAB donor CU.

[0115] For the IAB node to be reconstructed to a different IAB donor DU under the same central control node central unit IAB donor CU as the original parent IAB node, and the IAB node can perform cross-IAB donor DU rerouting of data packets from the child node, it means that the IAB node 1 is reconstructed to the IAB donor DU 12, and the entire link where the IAB node 1 is located can route data packets from the child node, that is, the IAB node can perform rerouting of uplink data packets from the child IAB node with a destination address of the BAP address of the original IAB donor DU through the new IAB donor DU. Specifically, when the IAB node 1 receives a data packet from the child node IAB node 5 with a destination address of the BAP address of the original IAB donor DU (IAB donor DU 11), it can rewrite the destination address to the BAP address of the new IAB donor DU (IAB donor DU 12); and after the new IAB donor DU (IAB donor DU 12) receives the uplink data packet, it can correctly parse and deliver it to the IAB donor CU (IAB donor CU 1).

[0116] For the IAB node to be reconstructed to a different IAB donor DU under a different central control node central unit IAB donor CU from the original parent IAB node, and the IAB node can perform cross-IAB donor CU rerouting of data packets from the child node, it means that the IAB node 1 is reconstructed to the IAB donor DU 2, and the entire link where the IAB node 1 is located can route data packets from the child node, that is, the IAB node 1 can rewrite the original routing ID in the data packet to a new routing ID recognizable by the new IAB donor CU and IAB donor DU when it receives a data packet from the child node IAB node 5, and the new IAB donor CU (IAB donor CU 2) and IAB donor DU (IAB donor DU 2) can forward the data packet to the original IAB donor CU (IAB donor CU 1) after receiving it.

[0117] Optionally, the IAB node can perform cross-IAB donor CU rerouting of data packets from the child node, which can be determined by a routing table. Specifically, if the newly accessed parent node is in the routing table, it can be determined that the new IAB donor CU and IAB donor DU can forward the data packets to the original IAB donor CU after receiving the data packets, thereby determining that the link where the IAB node is located can perform cross-IAB donor CU rerouting of data packets from the child node.

[0118] Optionally, the IAB node can perform cross-IAB donor DU rerouting of data packets from the child node, which can be determined by a routing table. Specifically, if the newly accessed parent node is in the routing table, it can be determined that the newly accessed IAB donor DU can correctly parse and deliver the data packets from the child node to the IAB donor CU after receiving the data packets, thereby determining that the link where the IAB node is located can perform cross-IAB donor DU rerouting of data packets from the child node.

[0119] The method for notifying inter-node wireless link state provided by the embodiments of the present application determines that the parent node connected to the IAB node can route data packets from the child node of the IAB node by judging whether the above conditions are met, and determines whether to send wireless link state information to the child node based on the determined result information, so that the child node can obtain topology information in time and perform real-time topology adjustment, thereby solving the problem that the child node cannot transmit data due to the IAB node being connected to a parent node that cannot route data of the child node and the child node mistakenly considering that the wireless link is recovered.

[0120] Optionally, the method further comprises:

[0121] In the case that the IAB node is reconnected to a parent IAB node of the same central control node central unit IAB donor CU as the original parent IAB node and a different IAB donor DU, and the IAB node can perform cross-IAB donor DU rerouting, the IAB node performs inter-donor DU rerouting of data packets from the child node;

[0122] In the case that the IAB node is reconnected to a parent IAB node of a different IAB donor CU from the original parent IAB node, and the IAB node can perform inter-donor CU rerouting, the IAB node performs inter-donor CU rerouting of data packets from the child node;

[0123] In the case that the IAB node is reconstructed to the same central control node central unit IAB donor CU as the original parent IAB node, different IAB donor DU, and the IAB node is capable of cross IAB donor DU rerouting of data packets from the child node, the IAB node performs inter donor DU rerouting of data packets from the child node.

[0124] In the case that the IAB node is reconstructed to the IAB donor DU under the central control node central unit IAB donor CU different from the original parent IAB node, and the IAB node is capable of cross IAB donor CU rerouting of data packets from the child node, the IAB node performs inter donor CU rerouting of data packets from the child node.

[0125] Exemplarily, referring to Figure 5 In the case that the IAB node is reconstructed to the same central control node central unit IAB donor CU as the original parent IAB node, different IAB donor DU, and the IAB node is capable of cross IAB donor DU rerouting of data packets from the child node, the IAB node performs inter donor DU rerouting of data packets from the child node, which means that the IAB node 1 is reconstructed to the IAB node 3, and the whole link where the IAB node 1 is located is capable of routing data packets from the child node, and when the IAB node 1 receives a data packet from the child node IAB node 5 with a target address of BAP address of the original IAB donor DU (IAB donor DU 11), the IAB node 1 rewrites the target address IAB donor DU 11 to the BAP address of the new IAB donor DU (IAB donor DU 12).

[0126] For the case that the IAB node is reconstructed to a parent IAB node under a different IAB donor CU from the original parent IAB node, and the IAB node is capable of inter-donor CU rerouting, the IAB node performing inter-donor CU rerouting of data packets from child nodes means that the IAB node 1 is reconstructed to the IAB node 4, and the entire link where the IAB node 1 is located is capable of routing data packets from child nodes. When the IAB node 1 receives a data packet from the child node IAB node 5, the original routing ID in the data packet is rewritten to a new routing ID recognizable by the new IAB donor CU and IAB donor DU. The new IAB donor CU (IAB donor CU2) and IAB donor DU (IAB donor DU2) receive the data packet and forward the data packet to the original IAB donor CU (IAB donor CU1).

[0127] For the case that the IAB node is reconstructed to an IAB donor DU different from the original parent IAB node under the same central control node central unit IAB donor CU, and the IAB node is capable of routing data packets from the child node across the IAB donor DU, the IAB node performing inter-donor DU rerouting of data packets from child nodes means that the IAB node 1 is reconstructed to the IAB donor DU 12, and the entire link where the IAB node 1 is located is capable of routing data packets from child nodes. When the IAB node 1 receives a data packet from the child node IAB node 5 with a target address of the BAP address of the original IAB donor DU (IAB donor DU11), the target address IAB donor DU11 is rewritten to the BAP address of the new IAB donor DU (IAB donor DU12).

[0128] In the case that the IAB node is reconstructed to an IAB donor DU under a central control node central unit IAB donor CU different from the original parent IAB node, and the IAB node is capable of rerouting data packets from the child node across the IAB donor CU, the inter-donor CU rerouting of data packets from the child node by the IAB node refers to that the IAB node 1 is reconstructed to the IAB donor DU 2, and the entire link where the IAB node 1 is located is capable of routing data packets from the child node. When the IAB node 1 receives a data packet from the child node IAB node 5, the original routing ID in the data packet is rewritten as a new routing ID recognizable by the new IAB donor CU and the IAB donor DU. The new IAB donor CU (IAB donor CU 2) and the IAB donor DU (IAB donor DU 2) receive the data packet and forward the data packet to the original IAB donor CU (IAB donor CU 1).

[0129] Optionally, in the case that the result information is that the parent node connected to the IAB node is capable of routing data packets from the child node of the IAB node, the determining whether to send the radio link state information to the child node based on the determined result information comprises any of the following:

[0130] sending a radio link failure recovery indication message to the child node;

[0131] Specifically, the sending of the radio link failure recovery indication message to the child node refers to the sending of a type-3 RLF indication message to the child node to indicate the current IAB node radio link recovery to the child node.

[0132] In the case that the routing reconfiguration information sent by the central control node IAB donor is obtained, the routing reconfiguration information is sent to the child node.

[0133] Optionally, the sending of the routing reconfiguration information to the child node in the case that the routing reconfiguration information sent by the central control node IAB donor is obtained comprises:

[0134] In the case that the IAB node is reconstructed to an IAB donor DU accessed by the original parent IAB node, an IAB donor DU different from the original parent IAB node, and other parent IAB nodes different from the original parent IAB node, the IAB node waits for routing reconfiguration information sent by the IAB donor;

[0135] In a case where the routing reconfiguration information sent by the central control node IAB donor is acquired, the routing reconfiguration information is sent to the child node.

[0136] Exemplarily, with reference to Figure 5 For a case where the IAB node is reestablished to an IAB donor DU accessed by the original parent IAB node, it refers to a case where the IAB node 1 is reestablished to an IAB donor DU accessed by the original parent IAB node IAB node 2, that is, the IAB node 1 is reestablished to the IAB donor DU 11.

[0137] For a case where the IAB node is reestablished to an IAB donor DU different from the original parent IAB node, it refers to a case where the IAB node 1 is reestablished to an IAB donor DU different from the IAB donor DU (IAB donor DU 11) accessed by the original parent IAB node IAB node 2, that is, the IAB node 1 is reestablished to the IAB donor DU 12 or the IAB donor DU 2.

[0138] For a case where the IAB node is reestablished to another parent IAB node different from the original parent IAB node, it refers to a case where the IAB node 1 is reestablished to another parent IAB node different from the original parent IAB node IAB node 2, that is, the IAB node 1 is reestablished to the IAB node 6, the IAB node 3 or the IAB node 4.

[0139] Optionally, the method further comprises:

[0140] Before acquiring the routing reconfiguration information sent by the central control node IAB donor, a radio link failure recovery indication message is sent to the child node; or

[0141] Before acquiring the routing reconfiguration information sent by the central control node IAB donor, no radio link failure recovery indication message is sent to the child node.

[0142] Exemplarily, in a case that the result information is that a parent node connected with the IAB node can route data packets of a child node of the IAB node, before obtaining routing reconfiguration information sent by a central control node IAB donor, a type-3RLF indication message is sent to the child node, in a case that the routing reconfiguration information sent by the central control node IAB donor is obtained, the routing reconfiguration information is sent to the child node; or, before obtaining the routing reconfiguration information sent by the central control node IAB donor, no type-3RLF indication message is sent to the child node, in a case that the routing reconfiguration information sent by the central control node IAB donor is obtained, the routing reconfiguration information is directly sent to the child node.

[0143] Optionally, the method further comprises:

[0144] in a case that the IAB node is reestablished to a parent IAB node of a same central control node central unit IAB donor CU as the original parent IAB node, a different IAB donor DU, or a parent IAB node under a central control node central unit IAB donor CU different from the original parent IAB node, a radio link failure recovery failure indication message is sent to the child node; or

[0145] in a case that the IAB node is reestablished to a parent IAB node of a same central control node central unit IAB donor CU as the original parent IAB node, a different IAB donor DU, or a parent IAB node under a central control node central unit IAB donor CU different from the original parent IAB node, no message is sent to the child node; or

[0146] in a case that the IAB node is reestablished to an IAB donor DU of a same IAB donor CU as the original parent IAB node or an IAB donor DU under a different IAB donor CU, a radio link failure recovery failure indication message is sent to the child node; or

[0147] in a case that the IAB node is reestablished to an IAB donor DU of a same IAB donor CU as the original parent IAB node or an IAB donor DU under a different IAB donor CU, no message is sent to the child node.

[0148] Exemplarily, with reference to Figure 5For the case that the IAB node is re-established to a parent IAB node with the same central control node-donor central unit IAB donor CU as the original parent IAB node, a different IAB donor DU, or a parent IAB node under a different central control node-donor central unit IAB donor CU than the original parent IAB node, sending a radio link failure recovery failure indication message to the child node means that, in the case that IAB node 1 is re-established to IAB node 3, or in the case that IAB node 1 is re-established to IAB node 4, a type-4 RLF indication message is sent to child node IAB node 5, indicating to the child node that the current IAB node radio link recovery has failed.

[0149] For the case that the IAB node is re-established to a parent IAB node with the same central control node-donor central unit IAB donor CU as the original parent IAB node, a different IAB donor DU, or a parent IAB node under a different central control node-donor central unit IAB donor CU than the original parent IAB node, not sending any message to the child node means that, in the case that IAB node 1 is re-established to IAB node 3, or in the case that IAB node 1 is re-established to IAB node 4, no message is sent to the child node IAB node 5. In the case that the second radio link failure recovery waiting timer is started at the child node IAB node 5, when the second radio link failure recovery waiting timer expires, the IAB node 5 does not receive any message, and the IAB node 5 can determine that the current IAB node radio link recovery has failed.

[0150] For the case that the IAB node is re-established to a parent IAB node with the same central control node-donor central unit IAB donor CU as the original parent IAB node, a different IAB donor DU, or a parent IAB node under a different central control node-donor central unit IAB donor CU than the original parent IAB node, sending a radio link failure recovery failure indication message to the child node means that, in the case that IAB node 1 is re-established to IAB donor DU 12, or in the case that IAB node 1 is re-established to IAB donor DU 2, a type-4 RLF indication message is sent to child node IAB node 5, indicating to the child node that the current IAB node radio link recovery has failed.

[0151] For the case where the IAB node is re-established to other IAB donor DU or other IAB donor CU under the same IAB donor CU as the original parent IAB node, not sending any message to the child node means that in the case where IAB node 1 is re-established to IAB donor DU 12, or in the case where IAB node 1 is re-established to IAB donor DU 2, no message is sent to the child node IAB node 5. In the case where the child node IAB node 5 starts a second radio link failure recovery waiting timer, when the second radio link failure recovery waiting timer times out, the IAB node 5 does not receive any message, and the IAB node 5 can determine that the current IAB node radio link recovery fails.

[0152] Cross-IAB donor DU re-routing or cross-IAB donor CU re-routing can have problems difficult to implement, such as requiring pre-judgment of the IAB node that may have a radio link failure and re-establishing to the IAB donor CU, and pre-configuring a rewriting table for it in cross-IAB donor CU re-routing. The inter-node radio link state notification method provided in the embodiments of the present application determines whether to send radio link state information to the child node by judging whether the above conditions are met. When it is determined that there is cross-IAB donor DU re-routing or cross-IAB donor CU re-routing, it is indicated that the child node current IAB node radio link recovery fails, so that the child node can obtain topology information in time and make real-time topology adjustment, avoiding the problem of difficult implementation of cross-IAB donor DU re-routing or cross-IAB donor CU re-routing, and solving the problem of child node data transmission caused by the child node mistakenly thinking that the radio link recovers because the IAB node is connected to the parent node that cannot route the data of the child node of the IAB node.

[0153] Optionally, in the case where the determined result information is that the parent node connected by the IAB node cannot route the data packet of the child node of the IAB node, the determining, based on the result information, whether to send radio link state information to the child node comprises any one of the following:

[0154] sending a radio link failure recovery failure indication message to the child node;

[0155] not sending any message to the child node;

[0156] start a first radio link failure recovery waiting timer, determine that the first radio link failure recovery waiting timer expires, send a radio link failure recovery failure indication message to the child node, or start the first radio link failure recovery waiting timer and not send any message to the child node;

[0157] In the case of obtaining the routing reconfiguration information sent by the central control node IAB donor, the routing reconfiguration information is sent to the child node.

[0158] For sending a radio link failure recovery failure indication message to the child node, a type-4 RLF indication message is sent to the child node to indicate that the current IAB node radio link recovery fails.

[0159] For not sending any message to the child node, in the case that the child node starts a second radio link failure recovery waiting timer, when the second radio link failure recovery waiting timer expires, the child node does not receive any message, and the child node can determine that the current IAB node radio link recovery fails.

[0160] For starting a first radio link failure recovery waiting timer, determining that the first radio link failure recovery waiting timer expires, sending a radio link failure recovery failure indication message to the child node, the IAB node determines that the newly accessed parent node can serve the child node or the newly accessed parent node can reconfigure the child node, but there may be a configuration delay due to the temporary inability of the parent node to accommodate the child node, when the first radio link failure recovery waiting timer expires, the reconfiguration information sent by the parent node is not received, a type-4 RLF indication message is sent to the child node to indicate that the current IAB node radio link recovery fails, so that the child node performs real-time topology adjustment and avoids long waiting and delays data transmission.

[0161] For starting a first radio link failure recovery waiting timer and not sending any message to the child node, the first radio link failure recovery waiting timer on the IAB node side can be used in cooperation with the second radio link failure recovery waiting timer on the child node side. It can be understood that the time parameter of the first radio link failure recovery waiting timer needs to be advanced by a period of time of the second radio link failure recovery waiting timer, for realizing the cooperation of the IAB node and the child node. Exemplarily, the first radio link failure recovery waiting timer is timed for 30 milliseconds, and the second radio link failure recovery waiting timer is timed for 40 milliseconds, to avoid the expiration of the timer when the child node receives the message due to the delay of signaling transmission.

[0162] Optionally, the parameter of the first radio link failure recovery waiting timer is a protocol specified default value or configured by an IAB donor to which the parent IAB node accesses.

[0163] Optionally, the method further comprises:

[0164] sending a radio link failure recovery indication message to the child node before the routing reconfiguration information sent by the central control node IAB donor is acquired; or

[0165] not sending a radio link failure recovery indication message to the child node before the routing reconfiguration information sent by the central control node IAB donor is acquired.

[0166] Exemplarily, in a case where the determined result information is that the parent node connected by the IAB node is unable to route data packets of the child node of the IAB node, a type-3RLF indication message is sent to the child node before the routing reconfiguration information sent by the central control node IAB donor is acquired, and the routing reconfiguration information is sent to the child node in a case where the routing reconfiguration information sent by the central control node IAB donor is acquired; or, in a case where the determined result information is that the parent node connected by the IAB node is able to route data packets of the child node of the IAB node, a type-3RLF indication message is not sent to the child node before the routing reconfiguration information sent by the central control node IAB donor is acquired, and the routing reconfiguration information is directly sent to the child node in a case where the routing reconfiguration information sent by the central control node IAB donor is acquired.

[0167] The method for notifying inter-node radio link state provided by the embodiments of the present application determines whether the parent node connected by the IAB node is able to route data packets of the child node of the IAB node by judging whether the above conditions are met, determines whether to send radio link state information to the child node based on the determined result information, so that the child node can acquire topology information in time and make real-time topology adjustment, thereby solving the problem that child node data cannot be transmitted due to the child node mistakenly thinking that the radio link is recovered because the IAB node is connected to a parent node that is unable to route data of the child node.

[0168] Figure 6 is a second flowchart of the method for notifying inter-node radio link state provided by the embodiments of the present application, as shown in Figure 6 The method can be applied to a child node of an IAB node and comprises:

[0169] After receiving the radio link failure detection indication message sent by the IAB node, the radio link state information sent by the IAB node is received, and it is determined whether the radio link recovery is completed according to the radio link state information.

[0170] Specifically, the IAB node refers to an IAB node accessed by a child node. The radio link failure detection indication message refers to a type-2RLF indication message, and the radio link state information is determined by the IAB node based on whether a parent node connected to the IAB node can route data packets of a child node of the IAB node.

[0171] The method for notifying the inter-node radio link state provided by the embodiments of the present application enables the child node to acquire the topology information in time and make real-time topology adjustment, thereby solving the problem of data transmission failure of the child node caused by the child node mistakenly considering the radio link recovery because the IAB node is connected to the parent node that cannot route the data of the child node.

[0172] Optionally, the receiving the radio link state information sent by the IAB node comprises:

[0173] The radio link failure recovery indication message received by the IAB node is specifically a type-3RLF indication message, which is used to indicate the radio link recovery of the current IAB node; or

[0174] The routing reconfiguration information sent by the IAB node is received; or

[0175] The radio link failure recovery failure indication message sent by the IAB node is received, and the radio link failure recovery failure indication message is specifically a type-4RLF indication message, which is used to indicate the radio link recovery failure of the current IAB node.

[0176] Optionally, before the receiving the routing reconfiguration information sent by the IAB node, the method further comprises:

[0177] The radio link failure recovery indication message sent by the IAB node is received.

[0178] Specifically, the radio link failure recovery indication message is a type-3RLF indication message, which is used to indicate the radio link recovery of the current IAB node. After the child node receives the type-3RLF indication message, the data transmission is resumed, and after the routing reconfiguration information is received, the routing reconfiguration is performed based on the routing reconfiguration information.

[0179] Optionally, the method further comprises:

[0180] start a second radio link failure recovery waiting timer, and if the second radio link failure recovery waiting timer expires and no radio link failure recovery indication message or routing reconfiguration information sent by the IAB node is received, determine that the radio link recovery fails.

[0181] Exemplarily, the child node starts a second radio link failure recovery waiting timer, and the timer is 40 milliseconds. When the second radio link failure recovery waiting timer expires and the child node still does not receive the radio link failure recovery indication message or the routing reconfiguration information sent by the IAB node, the child node determines that the radio link recovery fails, and can initiate an RRC connection reestablishment process. The child node starts the second radio link failure recovery waiting timer, and determines that the radio link recovery fails based on the second radio link failure recovery waiting timer and the fact that no message sent by the IAB node is received. The child node does not need to determine that the radio link recovery fails through a type-4 RLF indication message, and signaling resources are saved.

[0182] Optionally, a parameter of the second radio link failure recovery waiting timer is a default value specified by a protocol or configured by an original parent IAB node.

[0183] The method for notifying the inter-node radio link state provided by the embodiments of the present application enables the child node to obtain topology information in time and make real-time topology adjustment, and solves the problem that data of the child node cannot be transmitted due to the fact that the IAB node is connected to a parent node that cannot route data of the child node and the child node mistakenly considers that the radio link recovery succeeds.

[0184] The method for notifying the inter-node radio link state provided by the embodiments of the present application will be described below in combination with multiple embodiments.

[0185] Embodiment 1: The IAB node is reestablished to the original parent IAB node.

[0186] The IAB node:

[0187] Step 1: When a radio link failure occurs, a type-2 RLF indication is sent to the child node, and a radio link recovery is started to be performed.

[0188] Step 2: Whether to be reestablished to the original IAB node is determined.

[0189] Step 3: A type-3 RLF indication is sent to the child node.

[0190] The child IAB node:

[0191] Step 1: receiving type-2RLF indication sent by the parent node (i.e. the IAB node to which the child node is connected), re-routing the data packets to be sent to the parent node to other paths for transmission, or performing other operations in abnormal situations, such as reducing the transmission of uplink data, etc.

[0192] Step 2: receiving type-3RLF indication sent by the parent node, resuming transmission with the parent node, and stopping all operations in abnormal situations.

[0193] The difference between embodiment 1 and the prior art is that the IAB node needs to perform the operation of determining whether the parent IAB node is the original IAB node before sending the type-3RLF indication.

[0194] Embodiment 2: the IAB node re-establishes to other parent IAB nodes under the original IAB donor DU.

[0195] IAB node:

[0196] Step 1: wireless link failure occurs, type-2RLF indication is sent to the child node, and wireless link recovery is started to be performed;

[0197] Step 2: determine whether the new parent IAB node is in the routing table of the IAB node, so as to determine whether the IAB node can re-route the data packets from the child node.

[0198] Step 3: type-3RLF indication is sent to the child node, and after waiting for the IAB donor to send the routing reconfiguration message, the routing reconfiguration message is sent to the child node. Or,

[0199] Step 3': type-3RLF indication is not sent to the child node, and after waiting for the IAB donor to send the routing reconfiguration message, the routing reconfiguration message is sent to the child node.

[0200] Child IAB node:

[0201] Step 1: receiving type-2RLF indication sent by the parent node (i.e. the IAB node to which the child node is connected), re-routing the data packets to be sent to the parent node to other paths for transmission, or performing other operations in abnormal situations, such as reducing the transmission of uplink data, etc.

[0202] Step 2 (corresponding to step 3 of IAB node): receiving type-3RLF indication sent by parent node, resuming transmission with parent node, stopping all abnormal operations. Subsequently, receiving routing reconfiguration message, transmitting data according to new routing configuration. Or,

[0203] Step 2' (corresponding to step 3' of IAB node): receiving routing reconfiguration message sent by parent node, resuming transmission with parent node according to new routing configuration, stopping all abnormal operations.

[0204] The difference between embodiment 2 and prior art is that the IAB node needs to perform the operation of determining whether the parent IAB node is in the routing table before sending type-3RLF indication, i.e. determining whether the IAB node can re-route data packets from the child node. Optionally, the parent node can not send type-3RLF indication to the child node after wireless link failure recovery, and directly send routing reconfiguration message to the child node after receiving the routing reconfiguration message.

[0205] Embodiment 3: IAB node reestablishes to other IAB donor DU and / or other IAB donor CU of the same IAB donor CU as the original parent node (triggering wireless link failure of child node)

[0206] IAB node:

[0207] Step 1: wireless link failure occurs, type-2RLF indication is sent to child node, and wireless link recovery is started to be performed;

[0208] Step 2: determine whether the new parent node belongs to other IAB donor DU and / or other IAB donor CU of the same IAB donor CU, if yes, send type-4RLF indication to the child node, or do not send any indication.

[0209] Child IAB node:

[0210] Step 1: receiving type-2RLF indication sent by parent node (i.e. IAB node accessed by child node), re-routing data packets to be transmitted to parent node to other path for transmission according to needs, or performing other abnormal operations, such as reducing transmission of uplink data, etc.

[0211] Step 2: Receive type-4RLF indication, initiate RRC connection reestablishment, or, start pre-configured “second radio link failure recovery waiting timer”, if the timer expires, the child node still does not receive any indication from the IAB node, consider radio link failure happens, initiate RRC connection reestablishment.

[0212] Embodiment 4: IAB node reestablishes to IAB node under other IAB donor DU of the same IAB donor CU.

[0213] IAB node:

[0214] Step 1: Radio link failure happens, send type-2RLF indication to child node, and start performing radio link recovery;

[0215] Step 2: Determine whether the new parent IAB node belongs to other IAB donor DU of the same IAB donor CU, further determine whether inter-DU rerouting of data from child node is possible. If yes, perform step 3, if no, perform step 4;

[0216] Step 3: Send type-3RLF indication to child node, perform inter-DU rerouting of data from child node, send routing reconfiguration message to child node after receiving routing reconfiguration message sent by IAB donor, or,

[0217] Do not send type-3RLF indication to child node, send routing reconfiguration message to child node after receiving routing reconfiguration message sent by IAB donor.

[0218] Step 4: Send type-4RLF indication to child node, or, do not send any indication.

[0219] Child IAB node:

[0220] Step 1: Receive type-2RLF indication sent by parent node (i.e. IAB node accessed by child node), re-route data packets to be sent to parent node to other path for transmission as needed, or perform other operations in abnormal situations, such as reducing uplink data transmission, etc.

[0221] Step 2 (corresponding to step 3 of IAB node): Receive type-3RLF indication sent by parent node, resume transmission with parent node, stop all operations in abnormal situations. Subsequently, receive routing reconfiguration message, and transmit data according to the new routing configuration. or

[0222] If the route reconfiguration message sent by the IAB node is received directly, resume transmission to the parent node, stop all abnormal operations.

[0223] Step 3 (corresponding to step 4 of the IAB node): receive type-4RLF indication, initiate RRC connection reestablishment, or, start a pre-configured "second radio link failure recovery waiting timer", and if no indication from the IAB node is received after the timer expires, consider that a radio link failure has occurred, and initiate RRC connection reestablishment.

[0224] Embodiment 5: IAB node reestablishes to an IAB node under another IAB donor CU.

[0225] IAB node:

[0226] Step 1: a radio link failure occurs, a type-2RLF indication is sent to the child node, and a radio link recovery is started to be performed;

[0227] Step 2: determine whether the new parent IAB node belongs to another IAB donor CU, and further determine whether inter-CU rerouting of data from the child node is possible. If it is possible, perform step 3, and if it is not possible, perform step 4;

[0228] Step 3: send a type-3RLF indication to the child node, perform inter-CU rerouting of data from the child node, and after receiving a route reconfiguration message sent by the IAB donor, send a route reconfiguration message to the child node, or,

[0229] do not send a type-3RLF indication to the child node, and after receiving a route reconfiguration message sent by the IAB donor, send a route reconfiguration message to the child node.

[0230] Step 4: send a type-4RLF indication to the child node, or do not send any indication.

[0231] Child IAB node:

[0232] Step 1: receive a type-2RLF indication sent by the parent node (i.e. the IAB node to which the child node is connected), and re-route the data packets to be sent to the parent node to other paths for transmission as needed, or perform other abnormal operations, such as reducing the transmission of uplink data.

[0233] Step 2 (corresponding to step 3 of the IAB node): receiving the type-3 RLF indication sent by the parent node, resuming the transmission with the parent node, and stopping all abnormal operations. Subsequently, a routing reconfiguration message is received, and data transmission is performed according to the new routing configuration. Or

[0234] If the routing reconfiguration message sent by the IAB node is directly received, the transmission with the parent node is resumed, and all abnormal operations are stopped.

[0235] Step 3 (corresponding to step 4 of the IAB node): receiving a type-4 RLF indication, initiating RRC connection reestablishment, or starting a pre-configured "parent node radio link failure recovery waiting timer". If no indication from the IAB node is received after the timer expires, it is considered that a radio link failure occurs, and RRC connection reestablishment is initiated.

[0236] The method for notifying the inter-node radio link state provided by the embodiments of the present application determines whether to send the radio link state information to the child node by judging the parent IAB node connected by the IAB node after the radio link failure recovery of the IAB node, and determining whether the parent node connected by the IAB node can route the data packet of the child node, so that the child node can obtain the topology information in time and perform real-time topology adjustment, thereby solving the problem that the child node cannot transmit data due to the IAB node being connected to the parent node that cannot route the data of the child node, and the child node mistakenly considering that the radio link is recovered.

[0237] Figure 7 is a structural schematic diagram of an IAB node device provided by the embodiments of the present application, as shown in Figure 7 The IAB node device includes a transceiver 700, a processor 710, and a memory 720, wherein:

[0238] The memory 720 is used for storing a computer program, and the transceiver 700 is used for receiving and sending data under the control of the processor 710.

[0239] Among them, Figure 7In particular embodiments, the bus architecture can include any number of interconnecting buses and bridges, depending on the specific application of the processor 710 and the memory 720 that are linked together by the various circuits of the bus architecture. The bus architecture can also link various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art, and thus, will not be described further. The bus interface provides an interface to the transceiver 700. The transceiver 700 can be a number of elements, including a transmitter that can be configured to transmit to various other apparatus over a transmission medium, such as one or more antennas, a receiver that can be configured to receive to various other apparatus over a transmission medium, such as one or more antennas, a transceiver that can be configured to both transmit to and receive from various other apparatuses over a transmission medium, such as one or more antennas, etc. The processor 710 is responsible for managing the bus architecture and general processing, including the execution of software stored in the memory 720.

[0240] The processor 710 can be a central processing unit (CPU), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or complex programmable logic device (CPLD), or processor can be a multi-core architecture.

[0241] The processor 710 can be configured to execute computer program instructions stored in the memory 720 to perform any of the methods provided by embodiments of the present application, for example:

[0242] In the case of IAB node radio link failure recovery, determine whether a parent node connected to the IAB node can route data packets of a child node of the IAB node;

[0243] Based on the determined result information, determine whether to send radio link state information to the child node.

[0244] Optionally, the determining whether the parent node connected to the IAB node can route data packets of the child node of the IAB node comprises:

[0245] In the case of satisfying any one of the following conditions, it is determined that the parent node connected to the IAB node can route data packets of the child node of the IAB node; the conditions include:

[0246] The IAB node reestablishes to the original parent IAB node before the radio link failure occurs;

[0247] The IAB node reestablishes to the parent IAB node of the same central control node distributed unit IAB donor DU as the original parent IAB node.

[0248] the IAB node is re-established to a parent IAB node under a different central control node central unit IAB donor CU from the original parent IAB node, and the IAB node is capable of performing cross-IAB donor CU rerouting of data packets from the child node;

[0249] the IAB node is re-established to a parent IAB node under a different central control node central unit IAB donor CU from the original parent IAB node, and the IAB node is capable of performing cross-IAB donor CU rerouting of data packets from the child node;

[0250] the IAB node is re-established to an IAB donor DU accessed by the original parent IAB node;

[0251] the IAB node is re-established to a different IAB donor DU under the same central control node central unit IAB donor CU as the original parent IAB node, and the IAB node is capable of performing cross-IAB donor DU rerouting of data packets from the child node;

[0252] the IAB node is re-established to an IAB donor DU under a different central control node central unit IAB donor CU from the original parent IAB node, and the IAB node is capable of performing cross-IAB donor CU rerouting of data packets from the child node.

[0253] Optionally, in a case where the result information indicates that a parent node to which the IAB node is connected is capable of routing data packets of a child node of the IAB node, the determining, based on the determined result information, whether to send radio link state information to the child node comprises any one of:

[0254] sending a radio link failure recovery indication message to the child node;

[0255] in a case where the routing reconfiguration information sent by the central control node IAB donor is acquired, sending the routing reconfiguration information to the child node.

[0256] Optionally, the operations further comprise:

[0257] sending a radio link failure recovery indication message to the child node before the routing reconfiguration information sent by the central control node IAB donor is acquired; or

[0258] not sending a radio link failure recovery indication message to the child node before the routing reconfiguration information sent by the central control node IAB donor is acquired.

[0259] Optionally, the sending the routing reconfiguration information to the child node in the case that the routing reconfiguration information sent by the central control node IAB donor is acquired comprises:

[0260] In the case that the IAB node is reestablished to an IAB donor DU accessed by the original parent IAB node, an IAB donor DU different from the original parent IAB node, and a parent IAB node different from the original parent IAB node, the IAB node waits for routing reconfiguration information sent by the IAB donor.

[0261] In the case that the routing reconfiguration information sent by the central control node IAB donor is acquired, the routing reconfiguration information is sent to the child node.

[0262] Optionally, the operations further comprise:

[0263] In the case that the IAB node is reestablished to a parent IAB node of the same central control node central unit IAB donor CU as the original parent IAB node, a different IAB donor DU, or a parent IAB node under a central control node central unit IAB donor CU different from the original parent IAB node, a radio link failure recovery failure indication message is sent to the child node; or

[0264] In the case that the IAB node is reestablished to a parent IAB node of the same central control node central unit IAB donor CU as the original parent IAB node, a different IAB donor DU, or a parent IAB node under a central control node central unit IAB donor CU different from the original parent IAB node, no message is sent to the child node; or

[0265] In the case that the IAB node is reestablished to an IAB donor DU or an IAB donor DU under another IAB donor CU of the same IAB donor CU as the original parent IAB node, a radio link failure recovery failure indication message is sent to the child node; or

[0266] In the case that the IAB node is reestablished to an IAB donor DU or an IAB donor DU under another IAB donor CU of the same IAB donor CU as the original parent IAB node, no message is sent to the child node.

[0267] Optionally, the operations further comprise:

[0268] In a case that the IAB node is reestablished to a parent IAB node under a same central control node central unit IAB donor CU as the original parent IAB node, a different IAB donor DU, and the IAB node is capable of inter-donor DU rerouting of data packets from child nodes, the IAB node performs inter-donor DU rerouting of data packets from child nodes;

[0269] In a case that the IAB node is reestablished to a parent IAB node under a different central control node central unit IAB donor CU from the original parent IAB node, and the IAB node is capable of inter-donor CU rerouting, the IAB node performs inter-donor CU rerouting of data packets from child nodes;

[0270] In a case that the IAB node is reestablished to a parent IAB node under a same central control node central unit IAB donor CU as the original parent IAB node, a different IAB donor DU, and the IAB node is capable of inter-donor DU rerouting of data packets from child nodes, the IAB node performs inter-donor DU rerouting of data packets from child nodes;

[0271] In a case that the IAB node is reestablished to a parent IAB node under a different central control node central unit IAB donor CU from the original parent IAB node, and the IAB node is capable of inter-donor CU rerouting, the IAB node performs inter-donor CU rerouting of data packets from child nodes.

[0272] Optionally, in a case that the determined result information is that a parent node to which the IAB node is connected is incapable of routing data packets of child nodes of the IAB node, the determining, based on the result information, whether to send a radio link state information to the child node comprises any one of:

[0273] sending a radio link failure recovery failure indication message to the child node;

[0274] sending no message to the child node;

[0275] starting a first radio link failure recovery waiting timer, determining that the first radio link failure recovery waiting timer is expired, sending a radio link failure recovery failure indication message to the child node, or starting the first radio link failure recovery waiting timer and sending no message to the child node;

[0276] In a case where the routing reconfiguration information sent by the central control node IAB donor is acquired, the routing reconfiguration information is sent to the child node.

[0277] Optionally, the parameter of the first radio link failure recovery waiting timer is a protocol specified default value or configured by an original parent IAB node accessed IAB donor.

[0278] Optionally, the operation further comprises:

[0279] Before the routing reconfiguration information sent by the central control node IAB donor is acquired, a radio link failure recovery indication message is sent to the child node; or

[0280] Before the routing reconfiguration information sent by the central control node IAB donor is acquired, no radio link failure recovery indication message is sent to the child node.

[0281] The method for notifying inter-node wireless link state provided by the embodiments of the present application determines whether to send wireless link state information to the child node by judging the parent IAB node connected by the IAB node after the IAB node wireless link failure recovery, according to whether the parent node connected by the IAB node can route data packets of the child node, so that the child node can acquire topology information in time and make real-time topology adjustment, solving the problem that the child node data cannot be transmitted due to the IAB node being connected to a parent node that cannot route child node data and the child node mistakenly thinking that the wireless link is recovered.

[0282] It should be noted that the terminal device and the network device provided by the embodiments of the present application can realize all the method steps realized by the method embodiments and achieve the same technical effects, and the same parts and beneficial effects in the method embodiments will not be described in detail.

[0283] Figure 8 is a structure schematic diagram of the child node device of the IAB node provided by the embodiments of the present application, as Figure 8 shown, the child node device of the IAB node comprises a transceiver 800, a processor 810 and a memory 820, wherein:

[0284] The memory 820 is used for storing a computer program; the transceiver 800 is used for receiving and sending data under the control of the processor 810.

[0285] Wherein, in Figure 8In one embodiment, the bus architecture can include any number of interconnecting buses and bridges, depending on the specific application of the processor 810 and the memory 820 that are linked together by the various circuits representing one or more processors and memories, respectively. The bus architecture can also link various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art, and therefore, not further described herein. The bus interface provides an interface. The transceiver 800 can be a plurality of elements, i.e., including a transmitter and a receiver, providing a means for communicating with various other apparatus over a transmission medium, including a wireless channel, a wired channel, an optical cable, and the like. The processor 810 is responsible for managing the bus architecture and general processing, and the memory 820 can store data used by the processor 810 in executing operations.

[0286] The processor 810 can be a central processing unit (CPU), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or a complex programmable logic device (CPLD), and can also adopt a multi-core architecture.

[0287] The processor 810, by invoking the computer program stored in the memory 820, is configured to execute any of the methods provided by the embodiments of the present application according to the executable instructions obtained, for example:

[0288] After receiving the radio link failure detection indication message sent by the IAB node, the radio link state information sent by the IAB node is received, and whether the radio link recovery is completed is determined according to the radio link state information.

[0289] Optionally, the receiving the radio link state information sent by the IAB node comprises:

[0290] Receiving the radio link failure recovery indication message sent by the IAB node; or

[0291] Receiving the routing reconfiguration information sent by the IAB node; or

[0292] Receiving the radio link failure recovery failure indication message sent by the IAB node.

[0293] Optionally, before the receiving the routing reconfiguration information sent by the IAB node, the operation further comprises:

[0294] Receiving the radio link failure recovery indication message sent by the IAB node.

[0295] Optionally, the operations further comprise:

[0296] starting a second radio link failure recovery waiting timer, and if the second radio link failure recovery waiting timer expires, no radio link failure recovery indication message or routing reconfiguration information sent by the IAB node is received, determining that the radio link recovery fails.

[0297] Optionally, a parameter of the second radio link failure recovery waiting timer is a default value specified by a protocol or configured by an IAB donor to which an original parent IAB node accesses.

[0298] The method for notifying the inter-node radio link state provided by the embodiments of the present application enables the child node to obtain the topology information in time and make real-time topology adjustment, thereby solving the problem of data transmission failure of the child node caused by the IAB node being connected to the parent node that cannot route the data of the child node and the child node mistakenly considering that the radio link recovery is completed.

[0299] It should be noted that the terminal device and the network device provided by the embodiments of the present application can realize all the method steps realized by the method embodiments and achieve the same technical effects, and the same parts and beneficial effects of the method embodiments in the embodiments will not be described in detail.

[0300] Figure 9 As shown in FIG. 1, the device can be applied to an IAB node and comprises: Figure 9 As shown in FIG. 1, the device can be applied to an IAB node and comprises:

[0301] The determining unit 910 is configured to determine whether a parent node connected to the IAB node can route data packets of a child node of the IAB node in the case of radio link failure recovery of the IAB node.

[0302] The sending unit 920 is configured to determine whether to send radio link state information to the child node based on the determined result information.

[0303] Figure 10 As shown in FIG. 1, the device can be applied to an IAB node and comprises: Figure 10 As shown in FIG. 1, the device can be applied to an IAB node and comprises:

[0304] The receiving unit 1010 is configured to receive wireless link state information sent by the IAB node after receiving the wireless link failure detection indication message sent by the IAB node, and determine whether the wireless link recovery is completed according to the wireless link state information.

[0305] The method and device provided by the embodiments of the present application are based on the same application concept. Since the principles of the method and device for solving problems are similar, the implementation of the device and the method can be referred to each other, and the repeated parts will not be described in detail.

[0306] It should be noted that the division of units in the embodiments of the present application is illustrative, and is only a logical function division. In actual implementation, another division mode can be used. In addition, each functional unit in each embodiment of the present application can be integrated in one processing unit, or each unit can be physically present separately, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of a software functional unit.

[0307] When the integrated unit is realized in the form of a software functional unit and sold or used as an independent product, it can be stored in a processor-readable storage medium. Based on this understanding, the technical solutions of the present application essentially or the part that contributes to the prior art or the whole or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium, and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor to execute all or part of the steps of the method described in each embodiment of the present application. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various storage medium that can store program codes.

[0308] It should be noted that the above device provided by the embodiments of the present application can realize all method steps realized by the above method embodiments, and can achieve the same technical effects. Therefore, the same parts and beneficial effects of the method embodiments will not be described in detail.

[0309] On the other hand, the embodiments of the present application also provide a processor-readable storage medium, which stores a computer program. The computer program is used to make the processor execute the inter-node wireless link state notification method provided by each embodiment, including:

[0310] In a case of IAB node radio link failure recovery, determine whether a parent node connected to the IAB node can route data packets of a child node of the IAB node;

[0311] Based on the determined result information, determine whether to send radio link state information to the child node.

[0312] In another aspect, the embodiments of the present application also provide a processor-readable storage medium, which stores a computer program for causing a processor to perform the node inter-radio link state notification method provided by the above-mentioned embodiments, comprising:

[0313] After receiving the radio link failure detection indication message sent by the IAB node, receive the radio link state information sent by the IAB node, and determine whether to complete the radio link recovery according to the radio link state information.

[0314] The processor-readable storage medium can be any available medium or data storage device that the processor can access, including but not limited to a magnetic storage (such as a floppy disk, a hard disk, a magnetic tape, a magneto-optical disk (MO), etc.), an optical storage (such as a CD, a DVD, a BD, a HVD, etc.), and a semiconductor memory (such as a ROM, an EPROM, an EEPROM, a non-volatile memory (NAND FLASH), a solid-state disk (SSD)), etc.

[0315] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage and optical storage, etc.) containing computer-usable program code.

[0316] The present application is described with reference to flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of flows and / or blocks in the flowcharts and / or block diagrams can be implemented by computer executable instructions. These computer executable instructions can be provided to a general purpose computer, a special purpose computer, an embedded processor, or other programmable data processing devices to produce a machine, so that the instructions executed by the computer or other programmable data processing devices produce a device that implements the functions specified in the flowcharts and / or block diagrams. Figure 1 The functions specified in one flow or multiple flows and / or blocks Figure 1 The device that implements the functions specified in one flow or multiple flows and / or blocks

[0317] These processor-executable instructions can also be stored in a processor-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the processor-readable memory produce an article of manufacture including instruction means which implement the function specified in a flowchart Figure 1 of flows or multiple flows and / or blocks Figure 1 of blocks or multiple blocks.

[0318] These processor-executable instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the function specified in a flowchart Figure 1 of flows or multiple flows and / or blocks Figure 1 of blocks or multiple blocks.

[0319] Obviously, numerous modifications and variations of the present application are possible in light of the above teachings. It is therefore to be understood that within the scope of the claims and their equivalents, the application can be practiced otherwise than as specifically described.

Claims

1. A method for notifying the status of a wireless link between nodes, characterized in that, Applied to IAB nodes, including: In the event of a failed wireless link recovery at an IAB node, determine whether the parent node connected to the IAB node is able to route data packets from the child nodes of the IAB node. Based on the determined result information, determine whether to send wireless link status information to the child node; The step of determining whether the parent node connected to the IAB node can route data packets of the child nodes of the IAB node includes: The parent node connected to the IAB node is determined to be capable of routing data packets from the child nodes of the IAB node if any of the following conditions are met: The IAB node is rebuilt to the original parent IAB node before the wireless link failure occurred. The IAB node is rebuilt to the parent IAB node of the same central control node distributed unit (IAB donor DU) as the original parent IAB node. The IAB node is rebuilt to a parent IAB node with the same central control node central unit (IAB donor CU) as the original parent IAB node but a different IAB donor DU, and the IAB node is able to reroute data packets from the child node across IAB donor DUs. The IAB node is rebuilt to a parent IAB node under a different central control node central unit (IAB donor CU) than the original parent IAB node, and the IAB node is able to reroute data packets from the child node across IAB donor CUs. The IAB node is rebuilt to the IAB donor DU that the original parent IAB node was connected to. The IAB node is rebuilt to a different IAB donor DU that is the same central control node central unit (IAB donor CU) as the original parent IAB node, and the IAB node is able to reroute data packets from the child node across IAB donor DUs. The IAB node is rebuilt to an IABdonor DU under a different central control node central unit (IAB donor CU) than the original parent IAB node, and the IAB node is capable of rerouting data packets from the child node across IAB donor CUs.

2. The method for notifying the status of inter-node wireless links according to claim 1, characterized in that, If the result information indicates that the parent node connected to the IAB node is capable of routing data packets to the child nodes of the IAB node, then determining whether to send radio link state information to the child nodes based on the determined result information includes any of the following: Send a wireless link failure recovery indication message to the child node; Upon receiving routing reconfiguration information from the central control node (IAB donor), the routing reconfiguration information is sent to the child node.

3. The method for notifying the status of inter-node wireless links according to claim 2, characterized in that, The method further includes: Before receiving the routing reconfiguration information sent by the central control node (IAB donor), a radio link failure recovery indication message is sent to the child node; or Before receiving the routing reconfiguration information sent by the central control node (IAB donor), no wireless link failure recovery indication message is sent to the child node.

4. The method for notifying the status of inter-node wireless links according to claim 2, characterized in that, The step of sending the route reconfiguration information to the child node upon receiving the route reconfiguration information sent by the central control node (IAB donor) includes: When the IAB node reconnects to the IAB donor DU that the original parent IAB node accessed, the IAB donor DU that is different from the original parent IAB node, or other parent IAB nodes that are different from the original parent IAB node, the IAB node waits for the routing reconfiguration information sent by the IABdonor. Upon receiving routing reconfiguration information from the central control node (IAB donor), the routing reconfiguration information is sent to the child node.

5. The method for notifying the status of inter-node wireless links according to claim 1, characterized in that, The method further includes: In the case where the IAB node re-establishes itself as a parent IAB node with the same Central Control Node Center Unit (IAB Donor CU) as the original parent IAB node, or a parent IAB node with a different Central Control Node Center Unit (IAB Donor CU) than the original parent IAB node, a radio link failure recovery failure indication message is sent to the child node; or If the IAB node is rebuilt to a parent IAB node with the same central control node unit (IAB donor CU) as the original parent IAB node, a different parent IAB donor DU, or a parent IAB node with a different central control node unit (IAB donor CU) than the original parent IAB node, no message is sent to the child node; or If the IAB node re-establishes itself to another IAB donor DU under the same IAB donor CU as the original parent IAB node, or to another IAB donor DU under a different IAB donor CU, a radio link failure recovery failure indication message is sent to the child node; or If the IAB node is rebuilt to another IAB donor DU under the same IAB donor CU as the original parent IAB node, or to another IAB donor DU under the same IAB donor CU, no messages are sent to the child node.

6. The method for notifying the status of inter-node wireless links according to claim 2, characterized in that, The method further includes: When the IAB node is rebuilt to a parent IAB node with the same central control node central unit (IAB donor CU) as the original parent IAB node but a different IAB donor DU, and the IAB node is capable of cross-IAB donor DU rerouting, the IAB node performs inter-donor DU rerouting on data packets from the child node. When the IAB node is rebuilt to a parent IAB node under a different IAB donor CU than the original parent IAB node, and the IAB node is capable of inter donor CU rerouting, the IAB node performs inter donor CU rerouting on data packets from the child node. When the IAB node is rebuilt to the same central control node central unit (IAB donor CU) as the original parent IAB node but a different IAB donor DU, and the IAB node is capable of rerouting data packets from the child node across IAB donor DUs, the IAB node performs inter donor DU rerouting on data packets from the child node. When the IAB node is rebuilt to an IAB donor DU under a different central control node central unit (IAB donor CU) than the original parent IAB node, and the IAB node is capable of rerouting data packets from the child node across the IAB donor CU, the IAB node performs inter-donor CU rerouting for data packets from the child node.

7. The method for notifying the status of inter-node wireless links according to claim 1, characterized in that, If the determined result information indicates that the parent node connected to the IAB node is unable to route data packets from the child nodes of the IAB node, then determining whether to send radio link status information to the child nodes based on the result information includes any of the following: Send a wireless link failure recovery failure indication message to the child node; Do not send any messages to the child nodes; Start a first wireless link failure recovery waiting timer, determine that the first wireless link failure recovery waiting timer has expired, and send a wireless link failure recovery failure indication message to the child node, or start the first wireless link failure recovery waiting timer and do not send any message to the child node; Upon receiving routing reconfiguration information from the central control node (IAB donor), the routing reconfiguration information is sent to the child node.

8. The method for notifying the status of inter-node wireless links according to claim 7, characterized in that, The parameters of the first wireless link failure recovery waiting timer are either the default values ​​specified in the protocol or the configuration of the IAB donor to which the original parent IAB node is connected.

9. The method for notifying the status of inter-node wireless links according to claim 7, characterized in that, The method further includes: Before receiving the routing reconfiguration information sent by the central control node (IAB donor), a radio link failure recovery indication message is sent to the child node; or Before receiving the routing reconfiguration information sent by the central control node (IAB donor), no wireless link failure recovery indication message is sent to the child node.

10. A method for notifying the status of a wireless link between nodes, characterized in that, The child nodes applied to the IAB node include: After receiving the wireless link failure detection indication message sent by the IAB node, the system receives the wireless link status information sent by the IAB node and determines whether wireless link recovery has been completed based on the wireless link status information. The wireless link state information is sent by the IAB node based on the result of determining whether the parent node to which the IAB node is connected can route data packets of the child nodes of the IAB node. Determining whether the parent node to which the IAB node is connected can route data packets of the child nodes of the IAB node includes: The parent node connected to the IAB node is determined to be capable of routing data packets from the child nodes of the IAB node if any of the following conditions are met: The IAB node is rebuilt to the original parent IAB node before the wireless link failure occurred. The IAB node is rebuilt to the parent IAB node of the same central control node distributed unit (IAB donor DU) as the original parent IAB node. The IAB node is rebuilt to a parent IAB node with the same central control node central unit (IAB donor CU) as the original parent IAB node but a different IAB donor DU, and the IAB node is able to reroute data packets from the child node across IAB donor DUs. The IAB node is rebuilt to a parent IAB node under a different central control node central unit (IAB donor CU) than the original parent IAB node, and the IAB node is able to reroute data packets from the child node across IAB donor CUs. The IAB node is rebuilt to the IAB donor DU that the original parent IAB node was connected to. The IAB node is rebuilt to a different IAB donor DU that is the same central control node central unit (IAB donor CU) as the original parent IAB node, and the IAB node is able to reroute data packets from the child node across IAB donor DUs. The IAB node is rebuilt to an IABdonor DU under a different central control node central unit (IAB donor CU) than the original parent IAB node, and the IAB node is capable of rerouting data packets from the child node across IAB donor CUs.

11. The method for notifying the status of inter-node wireless links according to claim 10, characterized in that, The receipt of the radio link status information sent by the IAB node includes: Receive the radio link failure recovery indication message sent by the IAB node; or Receive routing reconfiguration information sent by the IAB node; or Receive the wireless link failure recovery failure indication message sent by the IAB node.

12. The method for notifying the status of inter-node wireless links according to claim 11, characterized in that, Before receiving the routing reconfiguration information sent by the IAB node, the method further includes: Receive the wireless link failure recovery indication message sent by the IAB node.

13. The method for notifying the status of inter-node wireless links according to claim 10, characterized in that, The method further includes: Start a second wireless link failure recovery waiting timer. If the second wireless link failure recovery waiting timer expires and no wireless link failure recovery indication message or route reconfiguration information is received from the IAB node, it is determined that the wireless link recovery has failed.

14. The method for notifying the status of inter-node wireless links according to claim 13, characterized in that, The parameters of the second wireless link failure recovery waiting timer are either the default values ​​specified in the protocol or the configuration of the IABdonor to which the original parent IAB node is connected.

15. An IAB node device, comprising a memory, a transceiver, and a processor; characterized in that: A memory for storing computer programs; a transceiver for sending and receiving data under the control of the processor; and a processor for reading the computer programs from the memory and performing the following operations: In the event of a failed wireless link recovery at an IAB node, determine whether the parent node connected to the IAB node is able to route data packets from the child nodes of the IAB node. Based on the determined result information, determine whether to send wireless link status information to the child node; The step of determining whether the parent node connected to the IAB node can route data packets of the child nodes of the IAB node includes: The parent node connected to the IAB node is determined to be capable of routing data packets from the child nodes of the IAB node if any of the following conditions are met: The IAB node is rebuilt to the original parent IAB node before the wireless link failure occurred. The IAB node is rebuilt to the parent IAB node of the same central control node distributed unit (IAB donor DU) as the original parent IAB node. The IAB node is rebuilt to a parent IAB node with the same central control node central unit (IAB donor CU) as the original parent IAB node but a different IAB donor DU, and the IAB node is able to reroute data packets from the child node across IAB donor DUs. The IAB node is rebuilt to a parent IAB node under a different central control node central unit (IAB donor CU) than the original parent IAB node, and the IAB node is able to reroute data packets from the child node across IAB donor CUs. The IAB node is rebuilt to the IAB donor DU that the original parent IAB node was connected to. The IAB node is rebuilt to a different IAB donor DU that is the same central control node central unit (IAB donor CU) as the original parent IAB node, and the IAB node is able to reroute data packets from the child node across IAB donor DUs. The IAB node is rebuilt to an IABdonor DU under a different central control node central unit (IAB donor CU) than the original parent IAB node, and the IAB node is capable of rerouting data packets from the child node across IAB donor CUs.

16. The IAB node device according to claim 15, characterized in that, If the result information indicates that the parent node connected to the IAB node is capable of routing data packets to the child nodes of the IAB node, then determining whether to send radio link state information to the child nodes based on the determined result information includes any of the following: Send a wireless link failure recovery indication message to the child node; Upon receiving routing reconfiguration information from the central control node (IAB donor), the routing reconfiguration information is sent to the child node.

17. The IAB node device according to claim 16, characterized in that, The operation also includes: Before receiving the routing reconfiguration information sent by the central control node (IAB donor), a radio link failure recovery indication message is sent to the child node; or Before receiving the routing reconfiguration information sent by the central control node (IAB donor), no wireless link failure recovery indication message is sent to the child node.

18. The IAB node device according to claim 16, characterized in that, Upon receiving the route reconfiguration information sent by the central control node IABdonor, sending the route reconfiguration information to the child node includes: When the IAB node reconnects to the IAB donor DU that the original parent IAB node accessed, the IAB donor DU that is different from the original parent IAB node, or other parent IAB nodes that are different from the original parent IAB node, the IAB node waits for the routing reconfiguration information sent by the IABdonor. Upon receiving routing reconfiguration information from the central control node (IAB donor), the routing reconfiguration information is sent to the child node.

19. The IAB node device according to claim 15, characterized in that, The operation also includes: In the case where the IAB node re-establishes itself as a parent IAB node with the same Central Control Node Center Unit (IAB Donor CU) as the original parent IAB node, or a parent IAB node with a different Central Control Node Center Unit (IAB Donor CU) than the original parent IAB node, a radio link failure recovery failure indication message is sent to the child node; or If the IAB node is rebuilt to a parent IAB node with the same central control node unit (IAB donor CU) as the original parent IAB node, a different parent IAB donor DU, or a parent IAB node with a different central control node unit (IAB donor CU) than the original parent IAB node, no message is sent to the child node; or If the IAB node re-establishes itself to another IAB donor DU under the same IAB donor CU as the original parent IAB node, or to another IAB donor DU under a different IAB donor CU, a radio link failure recovery failure indication message is sent to the child node; or If the IAB node is rebuilt to another IAB donor DU under the same IAB donor CU as the original parent IAB node, or to another IAB donor DU under the same IAB donor CU, no messages are sent to the child node.

20. The IAB node device according to claim 16, characterized in that, The operation also includes: When the IAB node is rebuilt to a parent IAB node with the same central control node central unit (IAB donor CU) as the original parent IAB node but a different IAB donor DU, and the IAB node is capable of cross-IAB donor DU rerouting, the IAB node performs inter-donor DU rerouting on data packets from the child node. When the IAB node is rebuilt to a parent IAB node under a different IAB donor CU than the original parent IAB node, and the IAB node is capable of inter donor CU rerouting, the IAB node performs inter donor CU rerouting on data packets from the child node. When the IAB node is rebuilt to the same central control node central unit (IAB donor CU) as the original parent IAB node but a different IAB donor DU, and the IAB node is capable of rerouting data packets from the child node across IAB donor DUs, the IAB node performs inter donor DU rerouting on data packets from the child node. When the IAB node is rebuilt to an IAB donor DU under a different central control node central unit (IAB donor CU) than the original parent IAB node, and the IAB node is capable of rerouting data packets from the child node across the IAB donor CU, the IAB node performs inter-donor CU rerouting for data packets from the child node.

21. The IAB node device according to claim 15, characterized in that, If the determined result information indicates that the parent node connected to the IAB node is unable to route data packets from the child nodes of the IAB node, then determining whether to send radio link status information to the child nodes based on the result information includes any of the following: Send a wireless link failure recovery failure indication message to the child node; Do not send any messages to the child nodes; Start a first wireless link failure recovery waiting timer, determine that the first wireless link failure recovery waiting timer has expired, and send a wireless link failure recovery failure indication message to the child node, or start the first wireless link failure recovery waiting timer and do not send any message to the child node; Upon receiving routing reconfiguration information from the central control node (IAB donor), the routing reconfiguration information is sent to the child node.

22. The IAB node device according to claim 21, characterized in that, The parameters of the first wireless link failure recovery waiting timer are either the default values ​​specified in the protocol or the configuration of the IAB donor to which the original parent IAB node is connected.

23. The IAB node device according to claim 21, characterized in that, The operation also includes: Before receiving the routing reconfiguration information sent by the central control node (IAB donor), a radio link failure recovery indication message is sent to the child node; or Before receiving the routing reconfiguration information sent by the central control node (IAB donor), no wireless link failure recovery indication message is sent to the child node.

24. A child node device of an IAB node, comprising a memory, a transceiver, and a processor; characterized in that: A memory for storing computer programs; a transceiver for sending and receiving data under the control of the processor; and a processor for reading the computer programs from the memory and performing the following operations: After receiving the wireless link failure detection indication message sent by the IAB node, the system receives the wireless link status information sent by the IAB node and determines whether wireless link recovery has been completed based on the wireless link status information. The wireless link state information is sent by the IAB node based on the result of determining whether the parent node to which the IAB node is connected can route data packets of the child nodes of the IAB node. Determining whether the parent node to which the IAB node is connected can route data packets of the child nodes of the IAB node includes: The parent node connected to the IAB node is determined to be capable of routing data packets from the child nodes of the IAB node if any of the following conditions are met: The IAB node is rebuilt to the original parent IAB node before the wireless link failure occurred. The IAB node is rebuilt to the parent IAB node of the same central control node distributed unit (IAB donor DU) as the original parent IAB node. The IAB node is rebuilt to a parent IAB node with the same central control node central unit (IAB donor CU) as the original parent IAB node but a different IAB donor DU, and the IAB node is able to reroute data packets from the child node across IAB donor DUs. The IAB node is rebuilt to a parent IAB node under a different central control node central unit (IAB donor CU) than the original parent IAB node, and the IAB node is able to reroute data packets from the child node across IAB donor CUs. The IAB node is rebuilt to the IAB donor DU that the original parent IAB node was connected to. The IAB node is rebuilt to a different IAB donor DU that is the same central control node central unit (IAB donor CU) as the original parent IAB node, and the IAB node is able to reroute data packets from the child node across IAB donor DUs. The IAB node is rebuilt to an IABdonor DU under a different central control node central unit (IAB donor CU) than the original parent IAB node, and the IAB node is capable of rerouting data packets from the child node across IAB donor CUs.

25. The child node device of the IAB node according to claim 24, characterized in that, The receipt of the radio link status information sent by the IAB node includes: Receive the radio link failure recovery indication message sent by the IAB node; or Receive routing reconfiguration information sent by the IAB node; or Receive the wireless link failure recovery failure indication message sent by the IAB node.

26. The child node device of the IAB node according to claim 25, characterized in that, Before receiving the routing reconfiguration information sent by the IAB node, the operation further includes: Receive the wireless link failure recovery indication message sent by the IAB node.

27. The child node device of the IAB node according to claim 24, characterized in that, The operation also includes: Start a second wireless link failure recovery waiting timer. If the second wireless link failure recovery waiting timer expires and no wireless link failure recovery indication message or route reconfiguration information is received from the IAB node, it is determined that the wireless link recovery has failed.

28. The child node device of the IAB node according to claim 27, characterized in that, The parameters of the second wireless link failure recovery waiting timer are the default values ​​specified in the protocol or the configuration of the IAB donor to which the original parent IAB node is connected.

29. A device for notifying the status of a wireless link between nodes, characterized in that, Applied to IAB nodes, including: The determining unit is used to determine whether the parent node connected to the IAB node is able to route data packets of the child nodes of the IAB node in the event of a wireless link failure and recovery of the IAB node. A sending unit is configured to determine, based on determined result information, whether to send wireless link status information to the child node, wherein determining whether the parent node connected to the IAB node can route data packets of the child node of the IAB node includes: The parent node connected to the IAB node is determined to be capable of routing data packets from the child nodes of the IAB node if any of the following conditions are met: The IAB node is rebuilt to the original parent IAB node before the wireless link failure occurred. The IAB node is rebuilt to the parent IAB node of the same central control node distributed unit (IAB donor DU) as the original parent IAB node. The IAB node is rebuilt to a parent IAB node with the same central control node central unit (IAB donor CU) as the original parent IAB node but a different IAB donor DU, and the IAB node is able to reroute data packets from the child node across IAB donor DUs. The IAB node is rebuilt to a parent IAB node under a different central control node central unit (IAB donor CU) than the original parent IAB node, and the IAB node is able to reroute data packets from the child node across IAB donor CUs. The IAB node is rebuilt to the IAB donor DU that the original parent IAB node was connected to. The IAB node is rebuilt to a different IAB donor DU that is the same central control node central unit (IAB donor CU) as the original parent IAB node, and the IAB node is able to reroute data packets from the child node across IAB donor DUs. The IAB node is rebuilt to an IABdonor DU under a different central control node central unit (IAB donor CU) than the original parent IAB node, and the IAB node is capable of rerouting data packets from the child node across IAB donor CUs.

30. A device for notifying the status of a wireless link between nodes, characterized in that, The child nodes applied to the IAB node include: The receiving unit is configured to receive a wireless link failure detection indication message sent by the IAB node, and then receive wireless link status information sent by the IAB node. Based on the wireless link status information, it determines whether wireless link recovery has been completed. The wireless link status information is sent by the IAB node based on the result of determining whether the parent node to which the IAB node is connected can route data packets of the child nodes of the IAB node. Determining whether the parent node to which the IAB node is connected can route data packets of the child nodes of the IAB node includes: The parent node connected to the IAB node is determined to be capable of routing data packets from the child nodes of the IAB node if any of the following conditions are met: The IAB node is rebuilt to the original parent IAB node before the wireless link failure occurred. The IAB node is rebuilt to the parent IAB node of the same central control node distributed unit (IAB donor DU) as the original parent IAB node. The IAB node is rebuilt to a parent IAB node with the same central control node central unit (IAB donor CU) as the original parent IAB node but a different IAB donor DU, and the IAB node is able to reroute data packets from the child node across IAB donor DUs. The IAB node is rebuilt to a parent IAB node under a different central control node central unit (IAB donor CU) than the original parent IAB node, and the IAB node is able to reroute data packets from the child node across IAB donor CUs. The IAB node is rebuilt to the IAB donor DU that the original parent IAB node was connected to. The IAB node is rebuilt to a different IAB donor DU that is the same central control node central unit (IAB donor CU) as the original parent IAB node, and the IAB node is able to reroute data packets from the child node across IAB donor DUs. The IAB node is rebuilt to an IABdonor DU under a different central control node central unit (IAB donor CU) than the original parent IAB node, and the IAB node is capable of rerouting data packets from the child node across IAB donor CUs.

31. A processor-readable storage medium, characterized in that, The processor-readable storage medium stores a computer program that causes the processor to perform the method according to any one of claims 1 to 9, or to perform the method according to any one of claims 10 to 14.

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