Information transmission method, wireless communication device and computer program product

Abstract

The invention provides an information transmission method, a wireless communication device and a computer program product. One or more user equipment or mobile terminals are connected to an integrated access and backhaul node. The disclosure relates to providing integrated access and backhaul indication information including at least mobile integrated access and backhaul node indication information or a group mobility indication. Integrated access and return indication information may be used to reduce signaling overhead and ensure service continuity.

Description

[0001] This application is a divisional application of a Chinese patent application with the application number "202080097054.8", the application date "February 17, 2020", and the title "Method and System for Transmitting Integrated Access and Backhaul Information". Technical Field

[0002] The present disclosure generally relates to wireless communication. Background Art

[0003] Mobile communication technology is pushing the world towards an increasingly interconnected and networked society. The rapid development of mobile communication and the progress of technology have led to a greater demand for capacity and connectivity. Other aspects such as energy consumption, device cost, spectral efficiency, and latency are also important for meeting the needs of various communication scenarios. Various technologies, including new ways to provide higher quality of service, longer battery life, and improved performance, are under discussion. Summary of the Invention

[0004] Among other aspects, this patent document describes techniques for communicating in an integrated access and backhaul (IAB) deployment of a New Radio (NR). IAB indication information can be used for IAB deployment.

[0005] The following aspects can be preferably implemented in various embodiments. In one aspect, the IAB indication information includes mobile IAB information that can be used for IAB deployment. In one aspect, a mobile IAB node has one or more mobile terminals (MTs) or user equipments (UEs) connected thereto.

[0006] In another aspect, the IAB indication information is transmitted to a base station; and the mobile IAB node information indicates that the IAB node is a mobile IAB node. In another aspect, after receiving the mobile IAB indication, the mobile IAB node information can be used to select a network element that supports mobile IAB to serve the MT or UE.

[0007] In another aspect, the IAB indication information is transmitted by an IAB node or by an MT or UE via a radio resource control (RRC) message. In another aspect, the IAB indication information is transmitted via an RRC connection setup complete message, or a measurement report message, or a UE assistance information message.

[0008] In another aspect, the IAB indication information is transmitted by an IAB node in system information; and the IAB node information indicates that the IAB node is a mobile IAB node, or indicates that the IAB node supports mobile integrated access and backhaul.

[0009] On the other hand, the IAB indication information is transmitted from one base station to another via an Xn Application Protocol (XnAP) message; and the mobile IAB node information indicates that the base station supports mobile IAB nodes.

[0010] In yet another aspect, the base station is an IAB host central unit (CU) or an integrated access and backhaul host gNB. In yet another aspect, the IAB indication information is sent via an XN SETUP REQUEST, or an XN SETUP RESPONSE, or an NG-RANNODE CONFIGURATION UPDATE, or an NG-RAN NODE CONFIGURATION UPDATE ACKNOWLEDGE message.

[0011] On the other hand, the IAB indication information is transmitted from the base station to the Access Mobility Management Function (AMF) or from the AMF to the base station via an NG Application Protocol (NGAP) message; and the mobile IAB node information indicates that the base station or the AMF supports mobile IAB.

[0012] In yet another aspect, the base station is an IAB host central unit (CU) or an integrated access and backhaul host gNB. In yet another aspect, the IAB indication information is transmitted via an NG SETUP REQUEST, or an NG SETUP RESPONSE, or a RAN CONFIGURATIONUPDATE, or a RAN CONFIGURATION UPDATE ACKNOWLEDGE, or an AMF CONFIGURATION UPDATE, or an AMF CONFIGURATION UPDATE ACKNOWLEDGE.

[0013] On the other hand, the IAB indication information includes group mobility information, which is available when the IAB node has one or more MTs or UEs connected thereto. On the other hand, the IAB indication information is transmitted via a Radio Resource Control (RRC) message from the IAB node or from the MT or UE. The group mobility indication indicates that the MT or UE supports group mobility, or that the MT or UE intends to perform group mobility; and the group mobility indication can be used by the base station to initiate a handover of the devices connected to the IAB node.

[0014] In yet another aspect, the IAB information is transmitted via an RRC establishment complete message, a measurement report message, or a UE assistance information message.

[0015] In another aspect, the IAB indication information is transmitted by an IAB node in the system information; the group mobility indication indicates that the IAB node supports group mobility.

[0016] In another aspect, the IAB indication information is transmitted from one base station to another via an Xn Application Protocol (XnAP) message; and the group mobility indication indicates that the base station supports group mobility.

[0017] In another aspect, the base station is an IAB host central unit (CU) or an IAB host gNB. In yet another aspect, the IAB indication information is sent via an XN SETUP REQUEST, or an XN SETUP RESPONSE, or an NG-RAN NODE CONFIGURATIONUPDATE, or an NG-RAN NODE CONFIGURATION UPDATE ACKNOWLEDGE message. In another aspect, the IAB indication information is transmitted from the base station to the Access Mobility Management Function (AMF) or from the AMF to the base station via an NG Application Protocol (NGAP) message; and the group mobility indication indicates that the base station or the AMF supports group mobility.

[0018] In yet another aspect, the base station is an IAB host central unit (CU) or an integrated access and backhaul host gNB. In yet another aspect, the IAB indication information is sent via an NG SETUP REQUEST, or an NG SETUP RESPONSE, or a RAN CONFIGURATIONUPDATE, or a RAN CONFIGURATION UPDATE ACKNOWLEDGE, or an AMF CONFIGURATION UPDATE, or an AMF CONFIGURATION UPDATE ACKNOWLEDGE.

[0019] In various aspects of the present disclosure, the transmission and reception of messages are performed by various devices including an MT, a UE, an IAB node, and an IAB host.

[0020] These and other aspects are described in the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Embodiments of IAB deployment in a movable vehicle are illustrated.

[0022] Figure 2 Embodiments of the IAB topology are illustrated.

[0023] Figure 3 Describes an embodiment of IAB indication information transmitted in an RRC message.

[0024] Figure 4 Describes an embodiment of IAB indication information in system information.

[0025] Figure 5 Describes that an IAB host transmits IAB indication information to another IAB host via an XnAP message.

[0026] Figure 6 Describes that IAB indication information is transmitted via an NGAP message.

[0027] Figure 7 Is a flowchart illustrating that an MT transmits IAB indication information via an RRC message.

[0028] Figure 8 Is a flowchart illustrating that an IAB node transmits IAB indication information via an RRC message.

[0029] Figure 9 Is a flowchart illustrating that an IAB host transmits IAB indication information via an XnAP message.

[0030] Figure 10 Is a flowchart illustrating that an IAB host transmits IAB indication information via an NGAP message.

[0031] Figure 11 Is a flowchart illustrating that an AMF transmits IAB indication information via an NGAP message.

[0032] Figure 12 Shows an example of a wireless communication system in which techniques according to one or more embodiments of the present technology can be applied.

[0033] Figure 13 Is a block diagram representation of a part of a wireless station to which one or more embodiments of the present technology are applicable. Detailed Description

[0034] The present disclosure relates to wireless systems. More specifically, the present disclosure relates to transmitting and receiving identification information that can be used by a network. As an example, the identification information can be used for handover, or for selecting network elements, or for identifying devices that support mobile IAB.

[0035] For example, an integrated access and backhaul (IAB) system supports wireless backhaul by deploying new radio (NR) cells to reduce the need for wired transmission infrastructure.

[0036] The termination node of the NR backhaul network on the network side is usually referred to as the IAB donor, which represents the gNB. The gNB is a logical node with additional functions to support IAB. The IAB node supports the gNB Distributed Unit (gNB-DU) function, which allows NR access to user equipment (UE) and the next-hop IAB node. The IAB node also supports the function for IAB-MT, which allows connection to the gNB-DU of another IAB node or IAB donor.

[0037] In one example, as Figure 1 shown, a movable vehicle such as a high-speed train 101 carries several passengers with one or more mobile terminals (MTs) or user equipments (UEs) 103 - 106. The UEs 103 - 106 are wirelessly connected to the IAB node 102, and the IAB node 102 is in turn connected to the host node or the parent IAB node 107 or 108. As the high-speed train travels, handovers occur between the parent IAB nodes. The UEs 103 - 106 access the network via the IAB node 102, and the IAB node 102 accesses the network via the parent IAB node. Here, it should be understood that the use of UEs and MTs is not mutually exclusive, and it should be assumed that either term can refer to an MT or a UE. It should also be understood that the parent IAB node should be understood to be subsumed in the term "base station".

[0038] As the train 101 travels, the relative positions between the UEs 103 - 106 and the IAB node 102 will hardly change. However, as the train 101 travels, the relative positions between the IAB node 102 and each IAB donor will change frequently.

[0039] Therefore, the present disclosure provides systems and methods for reducing signaling. In one embodiment, handover of the IAB node 102 can be performed, which is contrary to the handover of each individual UE 103 - 106. This reduces the signaling overhead and improves service continuity.

[0040] Figure 2 Illustrates the IAB topology. The parent nodes 201 and 202 have the IAB-DU function, and they provide NR access to the IAB node 203. The IAB node 203 has the functions of both an IAB MT and an IAB DU. The IAB node 203 can be connected to the parent nodes 201 and 202 as an IAB MT and also provide access to the child nodes 204 - 206 as an IAB DU. The child nodes 204 - 206 have the function of an IAB MT. It can be understood that any node in the topology can act as a host or a terminal as long as it is designed with that function.

[0041] In an embodiment, one or more UEs 303 - 306 are connected to an IAB node 302, and the IAB node 302 sends IAB indication information 308 to an IAB host central unit (CU) 307 via a Radio Resource Control (RRC) message. In another embodiment, the UE 303 sends the IAB indication information 308 to the IAB host CU 307 via an RRC message.

[0042] The IAB indication information may have at least mobile IAB node indication information and / or group mobility indication. In an embodiment, the IAB indication information has mobile IAB node indication information, which indicates that the IAB node 302 is a mobile IAB node. The network will then know that the IAB node 302 is in a scenario similar to Figure 1 the depicted scenario, and in an embodiment, group handover can be performed accordingly.

[0043] In another embodiment, the IAB indication information includes a group mobility indication. The group mobility indication indicates that the UEs 303 - 306 support group mobility or the UE intends to perform group mobility. In an embodiment, the IAB host CU 307 initiates a group mobility process in a handover scenario after receiving the group mobility indication.

[0044] In an embodiment, the IAB indication information sent via an RRC message can be sent via an RRC establishment complete message, or a measurement report message, or a UE assistance information message.

[0045] In another embodiment, as Figure 4 shown, the IAB node includes IAB indication information 402 in its system information 401. The IAB indication information 402 includes at least one of the following: a mobile IAB node indication that indicates that the IAB node is a mobile IAB node (or the IAB node supports mobile IAB nodes), or a group mobility indication that indicates that the IAB node supports group mobility.

[0046] In yet another embodiment, the Xn Application Protocol (XnAP) is used to convey the IAB indication information. As Figure 5 shown, a series of UEs 503 - 506 are connected to an IAB node 502. The IAB node 502 is connected to one or more IAB hosts 507 / 508, and one IAB host 507 sends an XnAP message 509 including the IAB indication information to another IAB host 508.

[0047] The IAB indication information includes at least one of a mobile IAB node indication or a group mobility indication. The mobile IAB node indication indicates that the IAB host supports mobile IAB nodes. The group mobility indication indicates that the IAB host supports group mobility.

[0048] Although Figure 5 FIG. depicts IAB hosts 507 and 508 connected to IAB node 502, it should be understood that any number (or no) of IAB hosts need to be connected to the IAB node when the IAB indication information is transmitted in the XnAP message 509.

[0049] In an embodiment, the IAB host is an IAB host CU or an IAB host gNB. In another embodiment, the IAB indication information may be sent via an XN SETUP REQUEST, or an XN SETUP RESPONSE, or an NG-RAN NODE CONFIGURATIONUPDATE, or an NG-RAN NODE CONFIGURATION UPDATE ACKNOWLEDGE message.

[0050] In an embodiment, as Figure 6 shown, the IAB host 601 transmits the IAB indication information to the access and mobility management function (AMF) 602 in the NG application protocol (NGAP) message 603, which may be located on any device. The annotation 604 illustrates that the NGAP message 603 is transmitted from the IAB host 601 to the AMF 602.

[0051] In another embodiment, the AMF 602 transmits the IAB indication information to the IAB host 601 in the NGAP message 603. The annotation 605 indicates that the NGAP message 603 is transmitted from the AMF 602.

[0052] The IAB indication information in the NGAP message 603 has at least one of a mobile IAB node indication or a group mobility indication. The mobile IAB node indication information indicates that the IAB host or the AMF supports a mobile IAB node. The group mobility indication indicates that the IAB host or the AMF supports group mobility.

[0053] In an embodiment, the IAB host is an IAB host CU and / or an IAB host gNB. The IAB indication information may be sent via an NGSETUP REQUEST, or an NG SETUP RESPONSE, or a RAN CONFIGURATION UPDATE, or a RANCONFIGURATION UPDATE ACKNOWLEDGE, or an AMF CONFIGURATION UPDATE, or an AMFCONFIGURATION UPDATE ACKNOWLEDGE.

[0054] As Figure 7As shown in the flowchart, in an embodiment, the MT transmits IAB indication information 702 via an RRC message. The IAB indication information has at least one of mobile IAB node indication information or group mobility information. The IAB indication information can be sent via an RRC establishment complete message, or a measurement report message, or UE assistance information. The IAB host CU receives the RRC message 704. In an embodiment, a handover 706 is performed later. It should be understood that the described MT can be a UE.

[0055] As Figure 8 As shown in the flowchart, in an embodiment, the IAB node transmits IAB indication information 802 via an RRC message. The IAB indication information has at least one of mobile IAB node indication information or group mobility information. The IAB indication information can be sent via an RRC establishment complete message, or a measurement report message, or UE assistance information. The IAB host CU receives the RRC message 804. In an embodiment, a handover 806 is performed later.

[0056] As Figure 9 As shown in the flowchart, in an embodiment, the IAB host transmits IAB indication information to another IAB host via an XnAP message. The IAB indication information has at least one of mobile IAB node indication information or group mobility information. The IAB host can be an IAB host CU or an IAB host gNB; and the IAB indication information can be sent via an XN SETUP REQUEST, or an XN SETUP RESPONSE, or an NG-RAN NODE CONFIGURATION UPDATE, or an NG-RAN NODE CONFIGURATION UPDATE ACKNOWLEDGE message. The IAB host receives the XnAP message 904. In an embodiment, a handover 906 is performed later.

[0057] As Figure 10As shown in the flowchart, in an embodiment, the IAB host sends IAB indication information 1002 via an NGAP message. The IAB indication information has at least one of mobile IAB node indication information or group mobility information. The AMF receives the NGAP message 1004. In an embodiment, a handover 1006 is performed later. The IAB indication information has at least one of mobile IAB node indication information or group mobility information. In addition, the IAB host can be an IAB host CU or an IAB host gNB. The IAB indication information can be sent via an NG SETUP REQUEST, or an NG SETUP RESPONSE, or a RAN CONFIGURATION UPDATE, or a RAN CONFIGURATION UPDATE ACKNOWLEDGE, or an AMF CONFIGURATION UPDATE, or an AMF CONFIGURATION UPDATE ACKNOWLEDGE.

[0058] As Figure 11 As shown in the flowchart, in an embodiment, the AMF sends IAB indication information 1002 via an NGAP message. The IAB indication information has at least one of mobile IAB node indication information or group mobility information. The IAB host receives the NGAP message 1004. In an embodiment, a handover 1006 is performed later. The IAB indication information has at least one of mobile IAB node indication information or group mobility information. In addition, the IAB host can be an IAB host CU or an IAB host gNB. The IAB indication information can be sent via an NG SETUP REQUEST, or an NG SETUP RESPONSE, or a RAN CONFIGURATION UPDATE, or a RAN CONFIGURATION UPDATE ACKNOWLEDGE, or an AMF CONFIGURATION UPDATE, or an AMF CONFIGURATION UPDATE ACKNOWLEDGE.

[0059] Figure 12FIG. 0 shows an example of a wireless communication system 1200 in which techniques according to one or more embodiments of the present technology may be applied. The wireless communication system 1200 may include: one or more base stations (BS) 1205a, 1205b, one or more wireless devices 1210a, 1210b, 1210c, 1210d, and a core network 1225. The base stations 1205a, 1205b may provide wireless services to the wireless devices 1210a, 1210b, 1210c, and 1210d in one or more wireless sectors. In some embodiments, the base stations 1205a, 1205b include directional antennas that generate two or more directional beams to provide wireless coverage in different sectors. It should be understood that with reference to Figure 1 and Figure 2 , the base station may be a series of IAB nodes.

[0060] The core network 1225 may communicate with one or more base stations 1205a, 1205b. The core network 1225 provides connectivity to other wireless communication systems and wired communication systems. The core network may include one or more service subscription databases to store information related to the subscribed wireless devices 1210a, 1210b, 1210c, and 1210d. The first base station 1205a may provide wireless services based on a first radio access technology, while the second base station 1205b may provide wireless services based on a second radio access technology. The base stations 1205a and 1205b may be co-located or may be installed separately on-site according to the deployment scenario. The wireless devices 1210a, 1210b, 1210c, and 1210d may support multiple different radio access technologies. The techniques and embodiments described in this document may be implemented by the wireless devices and base stations described in this document.

[0061] Figure 13is a block diagram representation of a part of a wireless station that applies one or more embodiments of the present technology. The wireless station 1305 (such as a base station or a wireless device (or UE) or MT) may include a processor electronic device 1310, such as a microprocessor, that implements one or more of the wireless technologies presented in this document. The wireless station 1305 may include a transceiver electronic device 1315 for transmitting and / or receiving wireless signals on one or more communication interfaces, such as an antenna 1320. The wireless station 1305 may include other communication interfaces for transmitting and receiving data. The wireless station 1305 may include one or more memories (not explicitly shown) configured to store information such as data and / or instructions. In some embodiments, the processor electronic device 1310 may include at least a part of the transceiver electronic device 1315. In some embodiments, at least some of the disclosed technologies, modules, or functions are implemented using the wireless station 1305. In some embodiments, the wireless station 1305 may be configured to perform the methods described herein.

[0062] It will be appreciated that this document discloses technologies that may be embodied in various embodiments of an IAB deployment. The disclosed and other embodiments, modules, and functional operations described in this document may be implemented in digital electronic circuits or in computer software, firmware, or hardware (including the structures disclosed herein and their equivalents) or in a combination of one or more of them. The disclosed and other embodiments may be implemented as one or more computer program products, i.e., one or more modules of computer program instructions encoded on a computer-readable medium and executed or controlling the operation of a data processing apparatus. The computer-readable medium may be a machine-readable storage device, a machine-readable storage substrate, a memory device, a composition of matter affecting a machine-readable propagated signal, or a combination of one or more of them. The term "data processing apparatus" encompasses all apparatus, devices, and machines for processing data, including, by way of example, a programmable processor, a computer, or multiple processors or computers. The apparatus may also include, in addition to hardware, code that creates an execution environment for the computer programs being discussed, such as code constituting processor firmware, a protocol stack, a database management system, an operating system, or a combination of one or more of them. The propagated signal is an artificially generated signal, e.g., a machine-generated electrical, optical, or electromagnetic signal, which is generated to encode information for transmission to a suitable receiver device.

[0063] A computer program (also known as a program, software, software application, script, or code) can be written in any form of programming language (including compiled or interpreted languages) and can be deployed in any form (including as a stand-alone program or as modules, components, subroutines, or other units suitable for a computing environment). A computer program does not necessarily correspond to a file in a file system. The program can be stored as part of a file that holds other programs or data (e.g., one or more scripts stored in a markup language document), in a single file dedicated to the program in question, or in multiple coordinated files (e.g., files that store one or more modules, subroutines, or portions of code). A computer program can be deployed to execute on one computer or on multiple computers located at one site or distributed across multiple sites and interconnected by a communication network.

[0064] The processes and logical flows described in this document can be performed by one or more programmable processors that execute one or more computer programs to perform functions by operating on input data and generating output. The processes and logical flows can also be performed by, for example, a special-purpose logic circuit such as an FPGA (field programmable gate array) or an ASIC (application specific integrated circuit), and the apparatus can also be implemented as a special-purpose logic circuit such as an FPGA (field programmable gate array) or an ASIC (application specific integrated circuit).

[0065] Processors suitable for executing a computer program include, by way of example, both general and special purpose microprocessors, and any one or more processors of any kind of digital computer. Generally, a processor will receive instructions and data from a read only memory or a random access memory or both. The essential elements of a computer are a processor for executing instructions and one or more memory devices for storing instructions and data. Generally, a computer will also include one or more mass storage devices for storing data, such as magnetic disks, magneto-optical disks, or optical disks, or operatively coupled to receive data from or transfer data to a mass storage device or both. However, a computer need not have such devices. Computer-readable media suitable for storing computer program instructions and data include all forms of non-volatile memory, media, and memory devices, including by way of example semiconductor memory devices such as EPROM, EEPROM, and flash memory devices; magnetic disks, such as internal hard disks or removable disks; magneto-optical disks; and CD ROM and DVD-ROM disks. The processor and the memory can be supplemented by, or incorporated in, special-purpose logic circuits.

[0066] Although this patent document contains many details, these details should not be construed as limiting any invention or the scope of what may be claimed, but rather as descriptions of features specific to particular embodiments of a specific invention. Certain features described in the context of separate embodiments in this patent document may also be implemented in combination in a single embodiment. Conversely, the various features described in the context of a single embodiment may also be implemented separately in multiple embodiments or in any suitable sub-combination. Moreover, although features may be described above as acting in certain combinations and even in the initially claimed combinations, one or more features from a claimed combination may in some cases be deleted from the combination, and the claimed combination may be directed to a sub-combination or a variation of a sub-combination.

[0067] Similarly, although the operations are depicted in the drawings in a particular order, this should not be construed as requiring that the operations be performed in the particular order shown or in a sequential order, or that all of the illustrated operations be performed to achieve the desired result. Additionally, the separation of various system components in the embodiments described in this patent document should not be construed as requiring such separation in all embodiments.

[0068] Only a few embodiments and examples have been described, and other embodiments, enhancements, and variations may be made based on what is described and illustrated in this patent document.

Claims

1. An information transmission method, comprising: receiving first integrated access and backhaul indication information from an integrated access and backhaul node, the integrated access and backhaul node communicating with a plurality of mobile terminals and being capable of moving together with the plurality of mobile terminals, the first integrated access and backhaul indication information including mobile integrated access and backhaul node information; transmitting second integrated access and backhaul indication information to a first base station.

2. The information transmission method according to claim 1, wherein: the mobile integrated access and backhaul node information indicates that the integrated access and backhaul node is a mobile integrated access and backhaul node.

3. The information transmission method according to claim 2, wherein, the first integrated access and backhaul indication information is transmitted by the integrated access and backhaul node via a radio resource control (RRC) message.

4. The information transmission method according to claim 3, wherein, the first integrated access and backhaul indication information is transmitted via an RRC establishment complete message.

5. The information transmission method according to claim 1, wherein: the second integrated access and backhaul indication information is transmitted from a second base station to the first base station via an Xn application protocol (XnAP) message.

6. The information transmission method according to any one of claims 1-5, wherein, the first base station is an integrated access and backhaul host central unit (CU) or an integrated access and backhaul host gNB, and the second base station is an integrated access and backhaul host CU or an integrated access and backhaul host gNB.

7. An information transmission method, comprising: an access and mobility management function (AMF) transmitting mobile integrated access and backhaul node indication information to a base station via an NG application protocol (NGAP) message, wherein the mobile integrated access and backhaul node indication information indicates that the AMF supports mobile integrated access and backhaul.

8. An information transmission method, comprising: sending, by an integrated access and backhaul node, first integrated access and backhaul indication information, the first integrated access and backhaul node communicating with a plurality of mobile terminals and being capable of moving together with the plurality of mobile terminals, the first integrated access and backhaul indication information including mobile integrated access and backhaul node information, wherein second integrated access and backhaul indication information different from the first integrated access and backhaul indication information is sent by a second base station or an access and mobility management function (AMF) to a first base station.

9. The information transmission method according to claim 8, wherein: the mobile integrated access and backhaul node information indicates that the integrated access and backhaul node is a mobile integrated access and backhaul node.

10. The information transmission method according to claim 9, wherein, the first integrated access and backhaul indication information is transmitted by the integrated access and backhaul node via a radio resource control (RRC) message.

11. The information transmission method according to claim 10, wherein, the first integrated access and backhaul indication information is transmitted via an RRC establishment complete message.

12. The information transmission method according to claim 8, wherein: The second integrated access and backhaul indication information is transmitted from the second base station to the first base station via an Xn Application Protocol (XnAP) message.

13. The information transmission method according to any one of claims 8-12, wherein, the first base station is an integrated access and backhaul host central unit (CU) or an integrated access and backhaul host gNB, and the second base station is an integrated access and backhaul host CU or an integrated access and backhaul host gNB.

14. An information transmission method, comprising: The base station receives mobile integrated access and backhaul node indication information from an Access and Mobility Management Function (AMF) via an NG Application Protocol (NGAP) message, wherein the mobile integrated access and backhaul node indication information indicates that the AMF supports mobile integrated access and backhaul.

15. A wireless communication device, comprising a processor configured to implement the method according to any one of claims 1 to 14.

16. A computer program product, comprising a computer-readable medium having code stored thereon, the code, when executed, causing a processor to implement the method according to any one of claims 1 to 14.

Images