Path fallback method, apparatus, and storage medium

Abstract

The application provides a path rollback method, device and storage medium. The method comprises the following steps: determining to migrate F1 of an edge IAB node from a target path to a first path, wherein the first path is a source path or another path, the source path is a path used by the F1 of the edge IAB node before the target path is used, and the other path is a path other than the target path and the source path; and sending indication information to a target IAB host and / or the edge IAB node, wherein the indication information is used to indicate release or suspension of configuration information for transmitting the F1 of the edge IAB node on the target path. The method realizes path rollback of the F1 of the edge IAB node migrated to the target path.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of communication, and particularly relates to a path rollback method and device and a storage medium. BACKGROUND

[0002] In a multi-hop relay network, data transmission between a user equipment (UE) and a donor base station can pass through one or more relay nodes. In 5G, the multi-hop relay network is also called an integrated access and backhaul (IAB) network.

[0003] In the IAB network, a source IAB donor can migrate the F1 of an edge IAB node from a source path to a target path for load consideration or based on a measurement report reported by the edge IAB node. However, the related protocol currently only supports the source IAB donor to migrate the F1 of the edge IAB node from the source path to the target path, and does not support rollback of the F1 of the edge IAB node migrated to the target path. SUMMARY

[0004] The present application provides a path rollback method, device and storage medium, which realizes rollback of the F1 path of the edge IAB node migrated to the target path.

[0005] In a first aspect, an embodiment of the present application provides a path rollback method, comprising:

[0006] determining to migrate the F1 of an edge IAB node from a target path to a first path, wherein the first path is a source path or another path, the source path is a path adopted by the F1 of the edge IAB node before the F1 adopts the target path, and the another path is a path other than the target path and the source path;

[0007] sending indication information to a target IAB donor and / or the edge IAB node, the indication information being used to indicate release or suspension of configuration information for transmitting the F1 of the edge IAB node on the target path.

[0008] In an embodiment, the sending of the indication information to the target IAB donor and / or the edge IAB node comprises:

[0009] sending a first message to the target IAB donor, the first message being used to indicate the target IAB donor to release or suspend first configuration information for transmitting the F1 of the edge IAB node.

[0010] In an embodiment, the first message is an XnAP message.

[0011] In an embodiment, the first configuration information comprises any one or more of:

[0012] IP-to-Layer 2 mapping, mapping between ingress backhaul radio link control channel and egress backhaul radio link control channel, backhaul adaptation protocol stack routing configuration, IP address allocated by the target IAB-donor to the edge IAB-node, backhaul radio link control channel.

[0013] In an embodiment, the sending the indication information to the target IAB-donor and / or the edge IAB-node comprises:

[0014] sending a second message to the edge IAB-node, the second message being used to instruct the edge IAB-node to release or suspend the second configuration information for transporting F1 of the edge IAB-node over the target path.

[0015] In an embodiment, the second message is an RRC message, and the sending the second message to the edge IAB-node comprises:

[0016] sending the second message to the MT of the edge IAB-node.

[0017] In an embodiment, the second message is an F1AP message, and the sending the second message to the edge IAB-node comprises:

[0018] sending the second message to the DU of the edge IAB-node.

[0019] In an embodiment, the second configuration information comprises any one or more of:

[0020] backhaul adaptation protocol stack header modification table, IP address allocated by the target IAB-donor to the edge IAB-node.

[0021] In an embodiment, the determining to migrate F1 of the edge IAB-node from the target path to the first path comprises:

[0022] determining to migrate F1 of the edge IAB-node from the target path to the first path according to at least one of a load of the source IAB-donor, a load of the target IAB-donor, a neighbor cell load, or a measurement report of the edge IAB-node.

[0023] In an embodiment, the method further comprises:

[0024] sending an RRC reconfiguration message to the edge IAB-node, the RRC reconfiguration message being used to switch the edge IAB-node to an IAB parent node of the first path;

[0025] Receive the RRC reconfiguration complete message sent by the edge IAB node;

[0026] Configure or activate the third configuration information of F1 for all nodes of the first path for transmitting the edge IAB node.

[0027] In one implementation, sending the RRC reconfiguration message to the edge IAB node includes:

[0028] The RRC reconfiguration message is sent from the IAB parent node of the first path to the edge IAB node;

[0029] The receipt of the RRC reconfiguration complete message sent by the edge IAB node includes:

[0030] Receive the RRC reconfiguration complete message sent by the edge IAB node through the IAB parent node of the target path.

[0031] In one implementation, the third configuration information includes any one or more of the following:

[0032] IP to Layer 2 mapping, mapping between inbound and outbound backhaul radio link control channels, backhaul adaptation protocol stack routing configuration, IP address assigned to the edge IAB node by the target IAB host, and backhaul radio link control channel.

[0033] Secondly, this application provides a path rollback device, including a memory, a transceiver, and a processor:

[0034] The memory is used to store computer programs;

[0035] The transceiver is used to send and receive data under the control of the processor;

[0036] The processor is configured to read the computer program stored in the memory and perform the following operations:

[0037] Determine to migrate the F1 of the edge IAB node from the target path to the first path, wherein the first path is the source path or other paths, the source path is the path taken by the F1 of the edge IAB node before adopting the target path, and the other paths are paths other than the target path and the source path;

[0038] Send indication information to the target IAB host and / or edge IAB node, the indication information being used to indicate the release or suspension of the F1 configuration information of the edge IAB node transmitted on the target path.

[0039] In one implementation, the processor is specifically configured to perform the following operations:

[0040] A first message is sent to the target IAB host, the first message being used to instruct the target IAB host to release or suspend the first configuration information of F1 for transmitting the edge IAB node.

[0041] In one implementation, the first message is an XnAP message.

[0042] In one implementation, the first configuration information includes any one or more of the following:

[0043] IP to Layer 2 mapping, mapping between inbound and outbound backhaul radio link control channels, backhaul adaptation protocol stack routing configuration, IP address assigned to the edge IAB node by the target IAB host, and backhaul radio link control channel.

[0044] In one implementation, the processor is further configured to perform the following operations:

[0045] A second message is sent to the edge IAB node, the second message being used to instruct the edge IAB node to release or suspend the second configuration information of the edge IAB node's F1 for transmission on the target path.

[0046] In one implementation, the second message is an RRC message, and the processor is specifically configured to perform the following operations:

[0047] The second message is sent to the MT of the edge IAB node.

[0048] In one implementation, the second message is an F1AP message, and the processor is specifically configured to perform the following operations:

[0049] The second message is sent to the DU of the edge IAB node.

[0050] In one implementation, the second configuration information includes any one or more of the following:

[0051] The backhaul adapts to the protocol stack header modification table and the IP address assigned to the edge IAB node by the target IAB host.

[0052] In one implementation, the processor is configured to perform the following operations:

[0053] Based on at least one of the load of the source IAB host, the load of the target IAB host, the load of the neighboring cell, or the measurement report of the edge IAB node, it is determined that the F1 of the edge IAB node will be migrated from the target path to the first path.

[0054] In one implementation, the processor is configured to perform the following operations:

[0055] Send an RRC reconfiguration message to the edge IAB node, the RRC reconfiguration message being used to switch the edge IAB node to the IAB parent node of the first path;

[0056] Receive the RRC reconfiguration complete message sent by the edge IAB node;

[0057] Configure or activate the third configuration information of F1 for all nodes of the first path for transmitting the edge IAB node.

[0058] In one implementation, the processor is specifically configured to perform the following operations:

[0059] The RRC reconfiguration message is sent from the IAB parent node of the first path to the edge IAB node;

[0060] Receive the RRC reconfiguration complete message sent by the edge IAB node through the IAB parent node of the target path.

[0061] In one implementation, the third configuration information includes any one or more of the following:

[0062] IP to Layer 2 mapping, mapping between inbound and outbound backhaul radio link control channels, backhaul adaptation protocol stack routing configuration, IP address assigned to the edge IAB node by the target IAB host, and backhaul radio link control channel.

[0063] Thirdly, this application provides a path rollback device, comprising:

[0064] A determining unit is configured to determine to migrate the F1 of the edge IAB node from the target path to a first path, wherein the first path is a source path or other paths, the source path is the path taken by the F1 of the edge IAB node before adopting the target path, and the other paths are paths other than the target path and the source path;

[0065] The sending unit is used to send indication information to the target IAB host and / or edge IAB node, the indication information being used to indicate the release or suspension of the transmission of the F1 configuration information of the edge IAB node on the target path.

[0066] In one embodiment, the transmitting unit is used to:

[0067] A first message is sent to the target IAB host, the first message being used to instruct the target IAB host to release or suspend the first configuration information of F1 for transmitting the edge IAB node.

[0068] In one implementation, the first message is an XnAP message.

[0069] In one implementation, the first configuration information includes any one or more of the following:

[0070] IP to Layer 2 mapping, mapping between inbound and outbound backhaul radio link control channels, backhaul adaptation protocol stack routing configuration, IP address assigned to the edge IAB node by the target IAB host, and backhaul radio link control channel.

[0071] In one embodiment, the transmitting unit is used to:

[0072] A second message is sent to the edge IAB node, the second message being used to instruct the edge IAB node to release or suspend the second configuration information of the edge IAB node's F1 for transmission on the target path.

[0073] In one implementation, the second message is an RRC message, and the sending unit is used to:

[0074] The second message is sent to the MT of the edge IAB node.

[0075] In one implementation, the second message is an F1AP message, and the sending unit is used to:

[0076] The second message is sent to the DU of the edge IAB node.

[0077] In one implementation, the second configuration information includes any one or more of the following:

[0078] The backhaul adapts to the protocol stack header modification table and the IP address assigned to the edge IAB node by the target IAB host.

[0079] In one implementation, the determining unit is used to:

[0080] Based on at least one of the load of the source IAB host, the load of the target IAB host, the load of the neighboring cell, or the measurement report of the edge IAB node, it is determined that the F1 of the edge IAB node will be migrated from the target path to the first path.

[0081] In one implementation, the sending unit is configured to: send an RRC reconfiguration message to the edge IAB node, the RRC reconfiguration message being used to switch the edge IAB node to the IAB parent node of the first path;

[0082] The device further includes: a receiving unit, configured to receive an RRC reconfiguration completion message sent by the edge IAB node;

[0083] The determining unit is used to configure or activate the third configuration information of all nodes in the first path for transmitting the F1 of the edge IAB node.

[0084] In one implementation, the sending unit is configured to: send the RRC reconfiguration message to the edge IAB node through the IAB parent node of the first path;

[0085] The receiving unit is used to: receive the RRC reconfiguration complete message sent by the edge IAB node through the IAB parent node of the target path.

[0086] In one implementation, the third configuration information includes any one or more of the following:

[0087] IP to Layer 2 mapping, mapping between inbound and outbound backhaul radio link control channels, backhaul adaptation protocol stack routing configuration, IP address assigned to the edge IAB node by the target IAB host, and backhaul radio link control channel.

[0088] Fourthly, this application provides a computer-readable storage medium storing a computer program for causing a computer to perform the methods described in the first aspect and any of the embodiments.

[0089] Fifthly, this application provides a computer program product, including a computer program that, when executed by a processor, implements the methods described in the first aspect and any of the embodiments.

[0090] This application provides a path rollback method, apparatus, and storage medium. In this method, after the source IAB donor migrates the F1 of the edge IAB node from the source path to the target path, it can also roll back the F1 of the edge IAB node that has been migrated to the target path, migrate the F1 of the edge IAB node back to the source path or other paths, and instruct the target IAB donor and / or the edge IAB node to release or suspend the transmission of the configuration information of the F1 of the edge IAB node on the target path, thereby realizing F1 path rollback.

[0091] It should be understood that the description in the foregoing summary section is not intended to limit the key or essential features of the embodiments of the present invention, nor is it intended to restrict the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0092] To more clearly illustrate the technical solutions in this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0093] Figure 1 A schematic diagram of the architecture of the IAB network provided in the embodiments of this application;

[0094] Figure 2 This is a schematic diagram of the source path and target path provided in the embodiments of this application;

[0095] Figure 3 A flowchart illustrating the path fallback method provided in this application embodiment. Figure 1 ;

[0096] Figure 4 A flowchart illustrating the path fallback method provided in this application embodiment. Figure 2 ;

[0097] Figure 5 Schematic diagram of the path backtracking device provided in the embodiments of this application Figure 1

[0098] Figure 6 Schematic diagram of the path backtracking device provided in the embodiments of this application Figure 2 . Detailed Implementation

[0099] In this application, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. In the embodiments of this application, the term "multiple" refers to two or more, and other quantifiers are similar.

[0100] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0101] This application provides a path rollback method and apparatus, which realizes the F1 path rollback of the edge IAB node migrated to the target path in a scenario where the source IAB host migrates the F1 of the edge IAB node from the source path to the target path. The method and apparatus are based on the same concept, and since the principles by which the method and apparatus solve the problem are similar, embodiments of the apparatus and method can be referred to each other, and repeated details will not be repeated.

[0102] The technical solutions provided in this application can be applied to various systems, especially 5G systems. For example, applicable systems include Global System for Mobile Communication (GSM), Code Division Multiple Access (CDMA), Wideband Code Division Multiple Access (WCDMA) General Packet Radio Service (GPRS), Long Term Evolution (LTE), LTE Frequency Division Duplex (FDD), LTE Time Division Duplex (TDD), Long Term Evolution Advanced (LTE-A), Universal Mobile Telecommunication System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX), and 5G New Radio (NR). All of these systems include terminal equipment and network equipment. The systems may also include a core network component, such as Evolved Packet System (EPS) and 5G system (5GS).

[0103] The terminal devices involved in the embodiments of this application can be devices that provide voice and / or data connectivity to users, handheld devices with wireless connectivity, or other processing devices connected to a wireless modem. The names of the terminal devices may differ in different systems; for example, in a 5G system, a terminal device can be called User Equipment (UE). Wireless terminal devices can communicate with one or more core networks (CNs) via a Radio Access Network (RAN). Wireless terminal devices can be mobile terminal devices, such as mobile phones (or "cellular" phones) and computers with mobile terminal devices, for example, portable, pocket-sized, handheld, computer-embedded, or vehicle-mounted mobile devices that exchange voice and / or data with the RAN. Examples include Personal Communication Service (PCS) phones, cordless phones, Session Initiated Protocol (SIP) phones, Wireless Local Loop (WLL) stations, and Personal Digital Assistants (PDAs). Wireless terminal equipment can also be referred to as a system, subscriber unit, subscriber station, mobile station, mobile station, remote station, access point, remote terminal, access terminal, user terminal, user agent, or user device, but is not limited to these terms in the embodiments of this application.

[0104] The base stations involved in the embodiments of this application may include multiple cells providing services to terminals. Depending on the specific application, a base station may also be called an access point, or a device in the access network that communicates with wireless terminal devices through one or more sectors on the air interface, or other names. For example, the base stations involved in the embodiments of this application may be evolved network devices (eNB or e-NodeB) in long term evolution (LTE) systems, 5G base stations (gNB) in 5G network architectures (next generation systems), or home evolved Node B (HeNB), relay nodes, femto, pico, etc., and are not limited in the embodiments of this application. In some network structures, base stations may include centralized unit (CU) nodes and distributed unit (DU) nodes, and the centralized unit and distributed unit may also be geographically separated.

[0105] Base stations and terminal devices can each use one or more antennas for multiple-input multiple-output (MIMO) transmission. MIMO transmission can be single-user MIMO (SU-MIMO) or multiple-user MIMO (MU-MIMO). Depending on the configuration and number of antenna combinations, MIMO transmission can be 2D-MIMO, 3D-MIMO, FD-MIMO, or massive-MIMO, and can also be diversity transmission, precoding transmission, or beamforming transmission, etc.

[0106] The following section will first introduce the IAB network.

[0107] like Figure 1 As shown, the IAB network consists of IAB donors, IAB nodes, and UEs. The IAB donor comprises two parts: an IAB donor CU and an IAB donor DU. A single IAB donor CU can have multiple IAB donor DUs. An IAB node consists of two parts: an IAB node DU and an IAB node mobile terminal (MT). The IAB node DU connects to the IAB donor CU via the F1 interface, and the IAB node MT connects to the next-layer IAB node DU or UE via the Uu interface.

[0108] The source IAB donor, for load considerations or based on measurement reports submitted by the edge IAB nodes, may migrate the F1 score of the edge IAB node from the source path to the target path. For example, ... Figure 2 As shown, the source path is the path between the source IAB donor CU, the source IAB donor DU, IAB node 1, and the edge IAB node, and the target path is the path between the source IAB donor CU, the target IAB donor DU, IAB node 2, and the edge IAB node. According to the current relevant protocol, the source IAB donor CU can offload the F1 of the edge IAB node from the source path to the target path, that is, migrate it to the target path. However, it does not support the rollback of the F1 of the edge IAB node that has been migrated to the target path.

[0109] Therefore, this application proposes that after the source IAB donor CU migrates the F1 of the edge IAB node from the source path to the target path, it can also roll back the F1 of the edge IAB node migrated to the target path, migrating the F1 of the edge IAB node back to the source path or other paths, and instructing the target IAB donor and / or the edge IAB node to release or suspend the transmission of the configuration information of the edge IAB node's F1 on the target path. The path rollback method provided in this application will be described in detail below through specific embodiments. It is understood that the following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments.

[0110] Figure 3 A flowchart illustrating the path fallback method provided in this application embodiment. Figure 1 This method is applied to the source IABdonor. For example... Figure 3 As shown, the method includes:

[0111] S301, Determine to migrate F1 of the edge IAB node from the target path to the first path.

[0112] The first path is the source path or other paths. The source path is the path used by the F1 of the edge IAB node before adopting the target path. Other paths are paths other than the target path and the source path.

[0113] After the source IAB donor migrates the F1 of the edge IAB node from the source path to the target path, it can be determined whether to migrate the F1 of the edge IAB node from the target path to the first path based on at least one of the load of the source IAB donor, the load of the target IAB donor, the load of the neighboring cells, or the measurement report of the edge IAB node.

[0114] In one implementation, if the source IAB donor's own load is low and there's no need to offload the edge IAB node's F1 to the target path, then the source IAB donor can migrate the edge IAB node's F1 from the target path back to the source path. For example, if the source IAB donor's load is less than a first threshold, then it's determined that the edge IAB node's F1 will be migrated from the target path to the source path.

[0115] In one implementation, if the source IAB donor determines that the target IAB donor's load is too high to support the offloading of F1 to the target path, the source IAB donor can migrate the edge IAB node's F1 from the target path back to the source path or another path. For example, the source IAB donor CU can receive an XnAP message (resourcestatus response, or other new XnAP message) sent by the target IAB donor to determine that the target IAB donor's load is too high. For example, if the target IAB donor's load exceeds a second threshold, it is determined that the edge IAB node's F1 will be migrated from the target path to a first path. When determining to migrate the edge IAB node's F1 from the target path to another path, the load of neighboring cells can be referenced to determine the other paths.

[0116] In one implementation, if the measurement report reported by the source IAB donor indicates that the signal quality of the target path is poor, while the signal quality of the first path is good, then the source IAB donor can migrate the F1 of the edge IAB node from the target path to the first path. For example, if the measurement report of the edge IAB node indicates that the signal quality of the target path is less than a third threshold and / or the signal quality of the first path is greater than a fourth threshold, then it is determined that the F1 of the edge IAB node will be migrated from the target path to the first path.

[0117] It should be noted that the source IAB donor can combine multiple data points from the source IAB donor's load, the target IAB donor's load, the neighboring cell load, or the edge IAB node's measurement report to determine which edge IAB node's F1 should be migrated from the target path to the first path.

[0118] S302. Send indication information to the target IAB donor and / or edge IAB node. The indication information is used to indicate whether to release or suspend the F1 configuration information of the edge IAB node on the target path.

[0119] If the source IAB donor determines that the F1 of the edge IAB node will be migrated from the target path to the first path, the source IAB donor instructs the target IAB donor and / or the edge IAB donor to release or suspend the transmission of the configuration information of the edge IAB node's F1 on the target path.

[0120] In one scenario, the source IAB donor instructs the target IAB donor to release the configuration information of the F1 of the edge IAB node being transmitted on the target path. The target IAB donor can then use the resources associated with this configuration information for the transmission of other F1s, improving resource utilization. Alternatively, the source IAB donor instructs the target IAB donor to suspend the transmission of the configuration information of the F1 of the edge IAB node on the target path. The target IAB donor temporarily stores this configuration information but does not continue to use it. If the source IAB donor needs to migrate the F1 of the edge IAB node to the target path again, this configuration information can take effect quickly, achieving rapid migration.

[0121] The source IAB donor instructs the edge IAB node to release the configuration information of its F1 function transmitted on the target path, which can avoid the edge IAB node storing useless information. If the source IAB donor instructs the edge IAB node to suspend the transmission of its F1 configuration information on the target path, the edge IAB node temporarily stores this configuration information. When the source IAB donor needs to migrate the edge IAB node's F1 function to the target path again, it can reduce the information carried by the edge IAB node during the reconfiguration process after migrating from the source path to the target path.

[0122] The path rollback method provided in this application embodiment allows the source IAB donor to migrate the F1 of the edge IAB node from the source path to the target path, and then roll back the F1 of the edge IAB node that has been migrated to the target path. This involves migrating the F1 of the edge IAB node back to the source path or other paths, and instructing the target IAB donor and / or the edge IAB node to release or suspend the transmission of the configuration information of the F1 of the edge IAB node on the target path, thereby realizing F1 path rollback.

[0123] Based on the above embodiments, the following further explains how the source IAB donor migrates the F1 of the edge IAB node from the target path to the source path or other paths, and how the target IAB donor and / or edge IAB node are instructed to release or suspend configuration information.

[0124] Reference Figure 4 The path rollback method includes:

[0125] S401, The source IAB donor determines that the F1 of the edge IAB node will be migrated from the target path to the first path.

[0126] This step is similar to S301 in the previous embodiment, and will not be described again here.

[0127] S402. The source IAB donor sends an RRC reconfiguration message to the edge IAB node. The RRC reconfiguration message is used to switch the edge IAB node to the IAB parent node of the first path.

[0128] After the source IAB donor determines to migrate the F1 of the edge IAB node from the target path to the first path, the source IAB donor needs to switch the edge IAB node to the IAB parent node of the first path. The IAB parent node is the node above the edge IAB node.

[0129] This process can be implemented through RRC reconfiguration messages. Optionally, the source IAB donor can send RRC reconfiguration messages to the edge IAB node through the IAB parent node of the first path.

[0130] Taking the source IAB donor determining the migration of the F1 of the edge IAB node from the target path to the source path as an example, refer to... Figure 2 The source IAB donor needs to switch the edge IAB node to the source path's IAB parent node, i.e., IAB node1. The source IAB donor sends the RRC reconfiguration message to IAB node1, which then sends it to the edge IAB node.

[0131] S403, the edge IAB node and the IAB parent node of the first path are randomly connected.

[0132] Taking the first path as the source path as an example, that is, the edge IAB node and IAB node1 perform random access. It should be noted that the timing of random access can be determined according to the actual situation, and is not limited to random access immediately after the edge IAB node receives the RRC reconfiguration message. This embodiment of the application only uses this as an example.

[0133] S404. The edge IAB node sends an RRC reconfiguration complete message to the source IAB donor.

[0134] Optionally, the edge IAB node sends an RRC reconfiguration complete message to the source IAB donor through the target IAB parent node. That is, the source IAB donor receives the RRC reconfiguration complete message sent by the edge IAB node through the target IAB parent node. (See reference...) Figure 2 The edge IAB node sends an RRC reconfiguration complete message to IAB node2, and then IAB node2 sends the RRC reconfiguration complete message to the source IAB donor.

[0135] S405. Configure or activate the third configuration information of F1 for all nodes of the first path for transmitting edge IAB nodes.

[0136] To enable the transmission of F1 from edge IAB nodes via the first path, corresponding configuration is required. Taking the first path as the source path as an example, if the third configuration information of all nodes on the source path is deleted when the source IAB donor migrates the F1 of the edge IAB node from the source path to the target path, then reconfiguration is necessary. If the third configuration information is suspended, it only needs to be activated. This allows the F1 of the edge IAB node to be migrated back to the source path.

[0137] Optionally, the third configuration information includes any one or more of the following:

[0138] Backhaul Adaptation Protocol (BAP) routing configuration, backhaul radio link control channel (BH RLC channel), IP to L2 mapping, mapping between ingress BH RLC channel and egress BH RLC channel, and IP address assigned to edge IAB node by the target IAB donor.

[0139] Among them, IP to L2 mapping is used to map F1 to the BH RLC channel; the mapping between ingress BH RLC channel and egress BH RLC channel refers to the mapping between ingress BH RLC channel and egress BH RLC channel when data passes through an IAB node; BAP routing configuration is the BAProuting ID of F1, which consists of path ID and destination BAP address, and is used to determine the next hop.

[0140] S406. The source IAB donor sends a first message to the target IAB donor. The first message is used to instruct the target IAB donor to release or suspend the first configuration information of F1 for transmitting the edge IAB node.

[0141] Optionally, the first message is an XnAP message.

[0142] Optionally, the first configuration information includes any one or more of the following:

[0143] IP to L2 mapping, mapping between ingress BH RLC channel and egress BH RLC channel, BAP routing configuration, IP address assigned to edge IAB node by the target IAB doner, and BH RLC channel.

[0144] Optionally, the source IAB donor instructs the target IAB donor CU to release or suspend the first configuration information via an XnAP message. Then, the target IAB donor CU sends an F1AP message to the target IAB donor DU to instruct the target IAB donor DU to release or suspend the first configuration information.

[0145] S407. The source IAB donor sends a second message to the edge IAB node. The second message is used to instruct the edge IAB node to release or suspend the second configuration information of the edge IAB node's F1 for transmission on the target path.

[0146] Optionally, the second message is an RRC message, which is sent by the source IAB donor to the MT of the edge IAB node to instruct the edge IAB node to release or suspend the second configuration information.

[0147] Optionally, the second message is an F1AP message, which is sent by the source IAB donor to the DU of the edge IAB node to instruct the edge IAB node to release or suspend the second configuration information.

[0148] Optional, the second configuration information includes any one or more of the following:

[0149] Return the BAP header rewrite table and the IP address assigned to the edge IAB node by the target IABdonor.

[0150] The BAP header rewrite table is used to rewrite BAP header information belonging to the first topology into BAP header information belonging to the second topology to enable data transmission along the target path. The BAP header information includes the BAP routing ID; that is, the BAP routing ID of the first topology is rewritten into the BAP routing ID of the second topology. For example, when a downlink data packet arrives at the edge IAB node, it has BAP header information belonging to topology 2, which needs to be rewritten at the edge IAB node into BAP header information belonging to topology 1; similarly, when an uplink data packet arrives at the edge IAB node, it has BAP header information belonging to topology 1, which needs to be rewritten at the edge IAB node into BAP header information belonging to topology 2.

[0151] In the path fallback method provided in this application embodiment, the source IAB donor, based on judgments such as load or measurement reports, falls back the F1 offloaded to the target path to the source path or other paths. Once the F1 falls back to the source path or other paths, the relevant configurations of these F1s in the target path can be released or suspended. If released, the resources related to these configurations can then be used for the transmission of other F1s belonging to the target IAB donor, improving resource utilization. If suspended, these F1s can be quickly migrated back to the target path. For example, when the source IAB donor is unstable and F1s need to be migrated to the target path in a short period of time, or when the target IAB donor experiences a momentary load peak, it is only necessary to briefly fall back the F1s to the source path or other paths before migrating them back to the target path again. The suspended configuration can take effect quickly during the migration. In addition, the source IAB donor can instruct the edge IAB node to release the configuration associated with the target path, thereby avoiding the edge IAB node storing useless information. Alternatively, it can instruct the edge IAB node to suspend the configuration associated with the target path, thereby reducing the information carried during the reconfiguration process of the edge IAB node after migrating back to the target path.

[0152] Figure 5Schematic diagram of the path backtracking device provided in the embodiments of this application Figure 1 .like Figure 5 As shown, the device includes a memory 501, a transceiver 502, and a processor 503.

[0153] Memory 501 is used to store computer programs;

[0154] Transceiver 502 is used to send and receive data under the control of processor 503;

[0155] Processor 503 is used to read the computer program stored in memory 501 and perform the following operations:

[0156] Determine to migrate the F1 of the edge IAB node from the target path to the first path, where the first path is the source path or other paths. The source path is the path used by the F1 of the edge IAB node before adopting the target path, and other paths are paths other than the target path and the source path.

[0157] Send indication information to the target IAB host and / or edge IAB node. The indication information is used to indicate whether to release or suspend the F1 configuration information of the edge IAB node on the target path.

[0158] In one implementation, processor 503 is specifically configured to perform the following operations:

[0159] Send a first message to the target IAB host. The first message is used to instruct the target IAB host to release or suspend the first configuration information of F1 for transmitting edge IAB nodes.

[0160] In one implementation, the first message is an XnAP message.

[0161] In one implementation, the first configuration information includes any one or more of the following:

[0162] IP to Layer 2 mapping, mapping between inbound and outbound backhaul radio link control channels, backhaul adaptation protocol stack routing configuration, IP address assigned to edge IAB nodes by the target IAB host, and backhaul radio link control channel.

[0163] In one implementation, the processor 503 is also configured to perform the following operations:

[0164] A second message is sent to the edge IAB node, which instructs the edge IAB node to release or suspend the second configuration information of the edge IAB node's F1 for transmission on the target path.

[0165] In one implementation, the second message is an RRC message, and the processor 503 is specifically used to perform the following operations:

[0166] Send a second message to the MT of the edge IAB node.

[0167] In one implementation, the second message is an F1AP message, and the processor 503 is specifically used to perform the following operations:

[0168] Send a second message to the DU of the edge IAB node.

[0169] In one implementation, the second configuration information includes any one or more of the following:

[0170] Return the modified protocol stack header table and the IP address assigned to the edge IAB node by the target IAB host.

[0171] In one implementation, processor 503 is configured to perform the following operations:

[0172] Based on at least one of the following: the load of the source IAB host, the load of the target IAB host, the load of the neighboring cell, or the measurement report of the edge IAB node, determine to migrate the F1 of the edge IAB node from the target path to the first path.

[0173] In one implementation, processor 503 is configured to perform the following operations:

[0174] Send an RRC reconfiguration message to the edge IAB node. The RRC reconfiguration message is used to switch the edge IAB node to the IAB parent node of the first path.

[0175] Receive the RRC reconfiguration complete message sent by the edge IAB node;

[0176] Configure or activate the third configuration information of F1 for all nodes in the first path for transmitting edge IAB nodes.

[0177] In one implementation, processor 503 is specifically configured to perform the following operations:

[0178] The IAB parent node of the first path sends an RRC reconfiguration message to the edge IAB node;

[0179] Receive the RRC reconfiguration complete message sent by the edge IAB node through the IAB parent node of the target path.

[0180] In one implementation, the third configuration information includes any one or more of the following:

[0181] IP to Layer 2 mapping, mapping between inbound and outbound backhaul radio link control channels, backhaul adaptation protocol stack routing configuration, IP address assigned to edge IAB nodes by the target IAB host, and backhaul radio link control channel.

[0182] It should be noted that the apparatus provided in this application can implement all the method steps in the above method embodiments and achieve the same technical effect. Therefore, the parts and beneficial effects that are the same as those in the method embodiments will not be described in detail here.

[0183] Figure 6 Schematic diagram of the path backtracking device provided in the embodiments of this application Figure 2 .like Figure 6 As shown, the device includes:

[0184] The determining unit 601 is used to determine the migration of F1 of the edge IAB node from the target path to the first path, wherein the first path is the source path or other paths, the source path is the path taken by the edge IAB node F1 before adopting the target path, and other paths are paths other than the target path and the source path.

[0185] The sending unit 602 is used to send indication information to the target IAB host and / or edge IAB node. The indication information is used to indicate the release or suspension of the configuration information of F1 of the edge IAB node transmitted on the target path.

[0186] In one embodiment, the sending unit 602 is used for:

[0187] Send a first message to the target IAB host. The first message is used to instruct the target IAB host to release or suspend the first configuration information of F1 for transmitting edge IAB nodes.

[0188] In one implementation, the first message is an XnAP message.

[0189] In one implementation, the first configuration information includes any one or more of the following:

[0190] IP to Layer 2 mapping, mapping between inbound and outbound backhaul radio link control channels, backhaul adaptation protocol stack routing configuration, IP address assigned to edge IAB nodes by the target IAB host, and backhaul radio link control channel.

[0191] In one embodiment, the sending unit 602 is used for:

[0192] A second message is sent to the edge IAB node, which instructs the edge IAB node to release or suspend the second configuration information of the edge IAB node's F1 for transmission on the target path.

[0193] In one implementation, the second message is an RRC message, and the sending unit 602 is used for:

[0194] Send a second message to the MT of the edge IAB node.

[0195] In one implementation, the second message is an F1AP message, and the sending unit 602 is used for:

[0196] Send a second message to the DU of the edge IAB node.

[0197] In one implementation, the second configuration information includes any one or more of the following:

[0198] Return the modified protocol stack header table and the IP address assigned to the edge IAB node by the target IAB host.

[0199] In one implementation, the determining unit is used to:

[0200] Based on at least one of the following: the load of the source IAB host, the load of the target IAB host, the load of the neighboring cell, or the measurement report of the edge IAB node, determine to migrate the F1 of the edge IAB node from the target path to the first path.

[0201] In one embodiment, the sending unit 602 is configured to: send an RRC reconfiguration message to the edge IAB node, the RRC reconfiguration message being used to switch the edge IAB node to the IAB parent node of the first path;

[0202] The device also includes: a receiving unit for receiving an RRC reconfiguration completion message sent by an edge IAB node;

[0203] The determining unit is used to configure or activate the third configuration information of F1 for transmitting edge IAB nodes for all nodes in the first path.

[0204] In one implementation, the sending unit 602 is configured to: send an RRC reconfiguration message to an edge IAB node through the IAB parent node of the first path;

[0205] The receiving unit is used to receive the RRC reconfiguration completion message sent by the edge IAB node through the IAB parent node of the target path.

[0206] In one implementation, the third configuration information includes any one or more of the following:

[0207] IP to Layer 2 mapping, mapping between inbound and outbound backhaul radio link control channels, backhaul adaptation protocol stack routing configuration, IP address assigned to edge IAB nodes by the target IAB host, and backhaul radio link control channel.

[0208] It should be noted that the apparatus provided in this application can implement all the method steps in the above method embodiments and achieve the same technical effect. Therefore, the parts and beneficial effects that are the same as those in the method embodiments will not be described in detail here.

[0209] It should be noted that the division of units in the embodiments of this application is illustrative and only represents one logical functional division. In actual implementation, other division methods may be used. Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated units described above can be implemented in hardware or as software functional units.

[0210] If the aforementioned integrated units are implemented as software functional units and sold or used as independent products, they can be stored in a processor-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0211] This application also provides a computer-readable storage medium storing a computer program for causing a computer to perform the methods described in the above method embodiments.

[0212] Computer-readable storage media can be any available medium or data storage device that a computer can access, including but not limited to magnetic storage (such as floppy disks, hard disks, magnetic tapes, magneto-optical disks (MOs), etc.), optical storage (such as CDs, DVDs, BDs, HVDs, etc.), and semiconductor storage (such as ROMs, EPROMs, EEPROMs, non-volatile memory (NAND flash), solid-state drives (SSDs)).

[0213] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the methods described in the above method embodiments.

[0214] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product implemented on one or more computer-usable storage media (including, but not limited to, disk storage and optical storage) containing computer-usable program code.

[0215] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer-executable instructions. These computer-executable instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0216] These processor-executable instructions may also be stored in a processor-readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the processor-readable memory produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0217] These processors can execute instructions that can also be loaded onto a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable device for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0218] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A path fallback method applied to a source IAB host, characterized in that, include: After F1 of the edge IAB node migrates from the source path to the target path, it is determined that F1 of the edge IAB node will be migrated from the target path to a first path. The first path is the source path or other paths. The source path is the path used by the edge IAB node F1 before adopting the target path. The other paths are paths other than the target path and the source path. The source path is the path between the source IAB host CU, the source IAB host DU, and the edge IAB node. The target path is the path between the source IAB host CU, the target IAB host DU, and the edge IAB node. Send indication information to the target IAB host and / or edge IAB node, the indication information being used to indicate the release or suspension of the F1 configuration information of the edge IAB node transmitted on the target path; Sending indication information to the target IAB host and / or edge IAB nodes includes: Send a first message to the target IAB host, the first message being used to instruct the target IAB host to release or suspend the first configuration information of F1 for transmitting the edge IAB node; The first message is an XnAP message.

2. The method according to claim 1, characterized in that, The first configuration information includes any one or more of the following: IP to Layer 2 mapping, mapping between inbound and outbound backhaul radio link control channels, backhaul adaptation protocol stack routing configuration, IP address assigned to the edge IAB node by the target IAB host, and backhaul radio link control channel.

3. The method according to claim 1, characterized in that, Sending indication information to the target IAB host and / or edge IAB nodes includes: A second message is sent to the edge IAB node, the second message being used to instruct the edge IAB node to release or suspend the second configuration information of the edge IAB node's F1 for transmission on the target path.

4. The method according to claim 3, characterized in that, The second message is an RRC message. Sending the second message to the edge IAB node includes: The second message is sent to the MT of the edge IAB node.

5. The method according to claim 3, characterized in that, The second message is an F1AP message. Sending the second message to the edge IAB node includes: The second message is sent to the DU of the edge IAB node.

6. The method according to claim 3, characterized in that, The second configuration information includes any one or more of the following: The backhaul adapts to the protocol stack header modification table and the IP address assigned to the edge IAB node by the target IAB host.

7. The method according to any one of claims 1-6, characterized in that, The determination to migrate the F1 of the edge IAB node from the target path to the first path includes: Based on at least one of the load of the source IAB host, the load of the target IAB host, the load of the neighboring cell, or the measurement report of the edge IAB node, it is determined that the F1 of the edge IAB node will be migrated from the target path to the first path.

8. The method according to any one of claims 1-6, characterized in that, The method further includes: Send an RRC reconfiguration message to the edge IAB node, the RRC reconfiguration message being used to switch the edge IAB node to the IAB parent node of the first path; Receive the RRC reconfiguration complete message sent by the edge IAB node; Configure or activate the third configuration information of F1 for all nodes of the first path for transmitting the edge IAB node.

9. The method according to claim 8, characterized in that, Sending the RRC reconfiguration message to the edge IAB node includes: The RRC reconfiguration message is sent from the IAB parent node of the first path to the edge IAB node; The receipt of the RRC reconfiguration complete message sent by the edge IAB node includes: Receive the RRC reconfiguration complete message sent by the edge IAB node through the IAB parent node of the target path.

10. The method according to claim 8, characterized in that, The third configuration information includes any one or more of the following: IP to Layer 2 mapping, mapping between inbound and outbound backhaul radio link control channels, backhaul adaptation protocol stack routing configuration, IP address assigned to the edge IAB node by the target IAB host, and backhaul radio link control channel.

11. A path backtracking device, applied to a source IAB donor, characterized in that, Includes memory, transceiver, and processor: The memory is used to store computer programs; The transceiver is used to send and receive data under the control of the processor; The processor is configured to read the computer program stored in the memory and perform the following operations: After F1 of the edge IAB node is migrated from the source path to the target path, it is determined that F1 of the edge IAB node will be migrated from the target path to a first path. The first path is the source path or other paths. The source path is the path used by the edge IAB node F1 before adopting the target path. The other paths are paths other than the target path and the source path. The source path is the path between the source IAB host CU, the source IAB host DU, and the edge IAB node. The target path is the path between the source IAB host CU, the target IAB host DU, and the edge IAB node. Send indication information to the target IAB host and / or edge IAB node, the indication information being used to indicate the release or suspension of the F1 configuration information of the edge IAB node transmitted on the target path; The processor is specifically used to perform the following operations: Send a first message to the target IAB host, the first message being used to instruct the target IAB host to release or suspend the first configuration information of F1 for transmitting the edge IAB node; The first message is an XnAP message.

12. The apparatus according to claim 11, characterized in that, The first configuration information includes any one or more of the following: IP to Layer 2 mapping, mapping between inbound and outbound backhaul radio link control channels, backhaul adaptation protocol stack routing configuration, IP address assigned to the edge IAB node by the target IAB host, and backhaul radio link control channel.

13. The apparatus according to claim 11, characterized in that, The processor is also used to perform the following operations: A second message is sent to the edge IAB node, the second message being used to instruct the edge IAB node to release or suspend the second configuration information of the edge IAB node's F1 for transmission on the target path.

14. The apparatus according to claim 13, characterized in that, The second message is an RRC message, and the processor is specifically used to perform the following operations: The second message is sent to the MT of the edge IAB node.

15. The apparatus according to claim 13, characterized in that, The second message is an F1AP message, and the processor is specifically used to perform the following operations: The second message is sent to the DU of the edge IAB node.

16. The apparatus according to claim 13, characterized in that, The second configuration information includes any one or more of the following: The backhaul adapts to the protocol stack header modification table and the IP address assigned to the edge IAB node by the target IAB host.

17. The apparatus according to any one of claims 11-16, characterized in that, The processor is used to perform the following operations: Based on at least one of the load of the source IAB host, the load of the target IAB host, the load of the neighboring cell, or the measurement report of the edge IAB node, it is determined that the F1 of the edge IAB node will be migrated from the target path to the first path.

18. The apparatus according to claim 17, characterized in that, The processor is used to perform the following operations: Send an RRC reconfiguration message to the edge IAB node, the RRC reconfiguration message being used to switch the edge IAB node to the IAB parent node of the first path; Receive the RRC reconfiguration complete message sent by the edge IAB node; Configure or activate the third configuration information of F1 for all nodes of the first path for transmitting the edge IAB node.

19. The apparatus according to claim 18, characterized in that, The processor is specifically used to perform the following operations: The RRC reconfiguration message is sent from the IAB parent node of the first path to the edge IAB node; Receive the RRC reconfiguration complete message sent by the edge IAB node through the IAB parent node of the target path.

20. The apparatus according to claim 18, characterized in that, The third configuration information includes any one or more of the following: IP to Layer 2 mapping, mapping between inbound and outbound backhaul radio link control channels, backhaul adaptation protocol stack routing configuration, IP address assigned to the edge IAB node by the target IAB host, and backhaul radio link control channel.

21. A path backtracking device, applied to a source IAB donor, characterized in that, include: The determining unit is configured to, after the F1 of an edge IAB node has migrated from the source path to the target path, determine to migrate the F1 of the edge IAB node from the target path to a first path, wherein the first path is the source path or other paths, the source path is the path used by the F1 of the edge IAB node before adopting the target path, and the other paths are paths other than the target path and the source path; the source path is the path between the source IAB host CU, the source IAB host DU, and the edge IAB node, and the target path is the path between the source IAB host CU, the target IAB host DU, and the edge IAB node; The sending unit is used to send indication information to the target IAB host and / or edge IAB node, the indication information being used to indicate the release or suspension of the F1 configuration information of the edge IAB node transmitted on the target path; The sending unit is specifically used to send a first message to the target IAB host. The first message is used to instruct the target IAB host to release or suspend the first configuration information of F1 for transmitting the edge IAB node. The first message is an XnAP message.

22. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program for causing a computer to perform the method as described in any one of claims 1-10.

23. A computer program product, characterized in that, Includes a computer program that, when executed by a processor, implements the method as described in any one of claims 1-10.

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