Internet of things terminal device networking method and system, and storage medium

Abstract

Embodiments of the present application disclose a kind of Internet of Things terminal equipment network access method, system and storage medium.The method belongs to the technical field of Internet of Things, it includes: if terminal is in non-LADN area, registration request is initiated to core network, then according to the normal DNN carried in the registration request, access the core network;If the terminal moves to LADN area, obtain the TA information corresponding to the LADN area from base station, and send the TA information to the core network, to trigger the core network to start TA update function and obtain TA target information;The core network corrects the normal DNN according to the TA target information and obtains LADN DNN;The terminal uses the LADN DNN and the core network to rebuild PDU session process to access the core network.The whole network access process of the application embodiment does not need URSP function, reduces terminal configuration demand, improves terminal network access success rate.

Description

Technical Field

[0001] This invention relates to the field of Internet of Things (IoT) technology, and in particular to a method, system, and storage medium for IoT terminal devices to access the network. Background Technology

[0002] Currently, there are three main 5GC edge deployment offloading technologies: Uplink Classifier (UL CL) scheme, IPv6 Multi-homing scheme, and Local Area Data Network (LADN) scheme. The LADN scheme requires terminals to support initiating LADN session requests under a specified Tracking Area (TA), support URSP (UE Route Selection Policy) for configuring the LADN DNN (Data Network Name), and bind application flows to the LADN for data offloading. However, due to the progress of terminal development, or the presence of a large number of different types of terminals in a campus, some special terminals do not support URSP. In these cases, they can only rely on the DNN and require manual switching to access the core network. This not only reduces the terminal's network access success rate but also increases the terminal configuration requirements. Summary of the Invention

[0003] This invention provides a method, system, and storage medium for IoT terminal devices to access the network, aiming to reduce terminal configuration requirements and improve the success rate of terminal network access.

[0004] In a first aspect, embodiments of the present invention provide a method for an Internet of Things (IoT) terminal device to access the network, comprising:

[0005] If a terminal initiates a registration request to the core network in a non-LADN area, it will access the core network according to the ordinary DNN carried in the registration request;

[0006] If the terminal moves to the LADN area, it obtains the TA information corresponding to the LADN area from the base station and sends the TA information to the core network to trigger the core network to start the TA update function to obtain the TA target information;

[0007] The core network corrects the ordinary DNN based on the TA target information to obtain the LADN DNN;

[0008] The terminal uses the LADN DNN to reconstruct the PDU session with the core network in order to access the core network.

[0009] Secondly, embodiments of the present invention also provide an Internet of Things (IoT) terminal device network access system, comprising: a first access unit, a first acquisition and transmission unit, and a second access unit configured in the terminal, and a first correction unit configured in the core network, wherein...

[0010] The first access unit is used to allow the terminal to access the core network according to the ordinary DNN carried in the registration request if the terminal initiates a registration request to the core network in a non-LADN area;

[0011] The first acquisition and transmission unit is used to acquire TA information corresponding to the LADN area from the base station if the terminal moves to the LADN area, and send the TA information to the core network to trigger the core network to start the TA update function to obtain the TA target information;

[0012] The first correction unit is used by the core network to correct the ordinary DNN according to the TA target information to obtain an LADN DNN;

[0013] The second access unit is used by the terminal to reconstruct the PDU session with the core network using the LADN DNN in order to access the core network.

[0014] Thirdly, embodiments of the present invention also provide an Internet of Things (IoT) terminal device network access system, which includes a terminal and a core network. Both the terminal and the device equipped with the core network include a memory and a processor. The memory stores a computer program, and the processor of the terminal and the core network implements the above-described method when executing the computer program.

[0015] Fourthly, embodiments of the present invention also provide a computer-readable storage medium storing a computer program that, when executed by a processor, can implement the above-described method.

[0016] This invention provides a method, system, and storage medium for IoT terminal devices to access the network. The method includes: if a terminal initiates a registration request to the core network in a non-LADN area, it accesses the core network using a standard DNN carried in the registration request; if the terminal moves to an LADN area, it obtains TA information corresponding to the LADN area from a base station and sends the TA information to the core network to trigger the core network to initiate a TA update function to obtain TA target information; the core network corrects the standard DNN based on the TA target information to obtain an LADN DNN; and the terminal uses the LADN DNN to reconstruct a PDU session with the core network to access the core network. This invention provides a solution where, for terminals that do not support URSP functionality, they access the core network using a standard DNN when in a non-LADN area; and when moving to an LADN area, the core network initiates a TA update function to correct the standard DNN to obtain an LADN DNN, and the LADN DNN is used to reconstruct a PDU session with the core network to access the core network. The entire network access process does not require URSP functionality, reducing terminal configuration requirements and improving the terminal's network access success rate. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. 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.

[0018] Figure 1 This is a schematic diagram of an Internet of Things (IoT) terminal device network access system provided in an embodiment of the present invention;

[0019] Figure 2 This is a flowchart illustrating a method for an IoT terminal device to access the network, as provided in an embodiment of the present invention.

[0020] Figure 3 A flowchart illustrating a method for an IoT terminal device to access the network, according to another embodiment of the present invention;

[0021] Figure 4 A flowchart illustrating a method for an IoT terminal device to access the network, as provided in another embodiment of the present invention;

[0022] Figure 5 A simplified flowchart of a method for IoT terminal devices to access the network, provided by an embodiment of the present invention;

[0023] Figure 6 This is a schematic block diagram of an Internet of Things (IoT) terminal device network access system provided in an embodiment of the present invention;

[0024] Figure 7 This is a schematic block diagram of a computer device provided in an embodiment of the present invention. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0027] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0028] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0029] As used in this specification and the appended claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrases "if determined" or "if [described condition or event] is detected" may be interpreted, depending on the context, as "once determined," "in response to determination," "once [described condition or event] is detected," or "in response to detection of [described condition or event]."

[0030] Please see Figure 1 , Figure 1 This is a schematic diagram of an IoT terminal device network access system provided by an embodiment of the present invention. The IoT terminal device network access system includes a terminal, a core network, and a base station. The terminal is an IoT terminal and does not support URSP functionality. In this embodiment, the terminal communicates with the core network and can access the core network; the terminal communicates with the base station and can obtain TA information corresponding to the LADN area; the base station communicates with the core network and can forward the terminal's session requests to the core network. It should be noted that... Figure 1 The terminals and base stations shown are for illustrative purposes only. In actual applications, there are multiple terminals and multiple base stations.

[0031] Figure 2 This is a flowchart illustrating a method for IoT terminal device network access provided by an embodiment of the present invention. The IoT terminal device network access method of this embodiment can be applied to an IoT terminal device network access system. For example, it can be implemented through software programs configured on the IoT terminal device network access system, thereby reducing terminal configuration requirements and improving the success rate of terminal network access. Figure 2 As shown, the method includes the following steps S100-S130.

[0032] S100. If the terminal initiates a registration request to the core network in a non-LADN area, it accesses the core network according to the ordinary DNN carried in the registration request.

[0033] In this embodiment of the invention, if a terminal that does not support URSP initiates a registration request to the core network in a non-LADN area, indicating that the terminal that does not support URSP initiated the registration request to the core network when it was not in the local data network, then the core network will connect the terminal to a preset access point according to the ordinary DNN carried in the registration request, so that the terminal can access the core network.

[0034] S110. If the terminal moves to the LADN area, it obtains the TA information corresponding to the LADN area from the base station and sends the TA information to the core network to trigger the core network to start the TA update function to obtain the TA target information.

[0035] In this embodiment of the invention, if a terminal that does not support URSP moves to an LADN area, indicating that it has moved into an area covered by the local data network, it obtains TA information corresponding to the LADN area from the base station and sends the TA information to the core network to trigger the core network to initiate the TA update function to obtain the TA target information. It should be noted that in this embodiment, multiple terminals correspond to one base station, and the TA information is the base station information corresponding to the LADN area. Triggering the core network to initiate the TA update function to obtain the TA target information specifically involves updating the base station information corresponding to the LADN area where the terminal is located. For example, assuming area 1 is LADN area 1, area 2 is LADN area 2, and area 3 is LADN area 3, the base station corresponding to LADN area 1, LADN area 2, and LADN area 3 is base station 1; area 4 is LADN area 4, and the base station corresponding to LADN area 4 is base station 2; areas 5 and 6 are non-LADN areas, and the corresponding base station is base station 3; if the terminal moves from area 5 to area 4, the TA information is base station 2, and the core network initiates the TA update function to update base station 3 to base station 2.

[0036] S120. The core network corrects the ordinary DNN according to the TA target information to obtain the LADN DNN.

[0037] In this embodiment of the invention, the core network matches the TA target information with a pre-configured user subscription information table to obtain a matching result. If the matching result is successful, it indicates that the TA target information exists in the pre-configured user subscription information table, and the local data network access point can be used. The core network then corrects the ordinary DNN to a LADNDNN. Understandably, if the matching result is unsuccessful, it indicates that the TA target information does not exist in the pre-configured user subscription information table, and the local data network access point cannot be used. The core network then continues to use the ordinary DNN for network access.

[0038] S130, The terminal uses the LADN DNN to reconstruct the PDU session with the core network to access the core network.

[0039] In this embodiment of the invention, the terminal sends a session request carrying the LADN DNN to the base station. The base station receives the session request and forwards it to the core network. The core network receives the session request and returns a confirmation of session establishment to the base station. The terminal receives the confirmation of session establishment and completes the PDU session reconstruction process to access the core network.

[0040] Figure 3 This is a flowchart illustrating a method for IoT terminal devices to access the network according to another embodiment of the present invention, as shown below. Figure 3As shown, in this embodiment, the method includes steps S100-S170. That is, in this embodiment, after step S130 in the above embodiment, the method further includes steps S140-S170.

[0041] S140. If the terminal moves out of the LADN area, it obtains the TA move-out information corresponding to the current non-LADN area from the base station and sends the TA move-out information to the core network to trigger the TA update function in the core network to obtain the TA move-out target information.

[0042] S150, The core network matches the TA removal target information with the user subscription information table;

[0043] S160. If the matching result is a mismatch, the core network corrects the LADN DNN to the ordinary DNN.

[0044] S170, The terminal uses the ordinary DNN to reconstruct the PDU session process with the core network to access the core network.

[0045] In this embodiment of the invention, if a terminal that does not support URSP moves out of the LADN area, it indicates that the terminal has moved out of the area covered by the local data network. The terminal then obtains the TA move-out information corresponding to the current non-LADN area from the base station and sends the TA move-out information to the core network to trigger the TA update function in the core network to obtain the TA move-out target information. It should be noted that in this embodiment, the TA move-out target information is base station information; triggering the TA update function in the core network to obtain the TA move-out target information specifically involves updating the base station information corresponding to the non-LADN area where the terminal is located. For example, assuming region 1 is LADN region 1, region 2 is LADN region 2, and region 3 is LADN region 3, the base station corresponding to LADN region 1, LADN region 2, and LADN region 3 is base station 1, region 4 is LADN region 4, the base station corresponding to LADN region 4 is base station 2, and regions 5 and 6 are non-LADN regions, with the corresponding base station being base station 3. When a terminal moves from region 3 to region 5, the TA (Target Availability) moveout information is from base station 3. The core network matches the TA moveout target information with the user subscription information table. If the matching result is a mismatch, it indicates that base station 3 does not exist in the user subscription information table, and the core network corrects the LADN DNN to the ordinary DNN. The terminal sends a session request carrying the ordinary DNN to the base station. The base station receives the session request and forwards it to the core network. The core network receives the session request and returns a confirmation of session establishment notification to the base station. The terminal receives the confirmation of session establishment notification and completes the PDU session reconstruction process to access the core network.

[0046] Figure 4 This is a flowchart illustrating a method for IoT terminal devices to access the network according to another embodiment of the present invention, as shown below. Figure 4 As shown, in this embodiment, the method includes steps S100-S190. That is, in this embodiment, the method further includes steps S180-S190 before step S100 in the above embodiment.

[0047] S180, The terminal signs up for LADN DNN function and LADN DNN error correction function with the core network;

[0048] S190. The core network is configured with a user subscription information table, wherein the user subscription information table records the mapping relationship between TA information and LADN DNN.

[0049] In this embodiment of the invention, before a terminal that does not support URSP function can access the core network, it needs to first sign up for LADN DNN function and LADN DNN error correction function with the core network. That is, the terminal first activates LADN DNN function and LADN DNN error correction function, and configures a user subscription information table on the core network side. The user subscription information table records the mapping relationship between TA information and LADN DNN.

[0050] Please see Figure 5 , Figure 5 This is a simplified flowchart illustrating a method for IoT terminal devices to access the network according to an embodiment of the present invention. Figure 5 In this system, terminals that do not support URSP (Ultra-High Spectrum Service) subscribe to LADN DNNs and perform LADN DNN error correction are configured. The core network configures the relationship between the TA (Transmission Terminal) and the LADN DNN. When a terminal initiates a registration request in a non-LADN area, it carries a regular DNN to join the network. When a terminal moves to an LADN area, the TA update process is triggered. The core network matches the TA information with the user's subscription information to determine whether the regular DNN needs to be corrected to an LADN DNN. If so, the PDU (Power Dedicated Unit) session process is re-established, and the terminal joins the network using the LADN DNN. When a terminal moves out of an LADN area, the TA update process is triggered. The core network matches the TA information with the user's subscription information. If the match is successful, the DNN correction process is triggered again, and the LADN DNN is changed to a regular DNN. The terminal joins the network using the regular DNN.

[0051] It should be noted that in this embodiment, when the terminal does not support the URSP function, the fault tolerance capability of the terminal in the LADN scenario is improved; it does not rely on the complex URSP algorithm capability of the terminal, reduces the configuration requirements of the terminal, and improves the network access success rate.

[0052] Figure 6This is a schematic block diagram of an Internet of Things (IoT) terminal device network access system 200 provided in an embodiment of the present invention. Figure 6 As shown, corresponding to the above-described method for IoT terminal devices to access the network applied to the terminal and the core network, the IoT terminal device network access system 200 includes a unit for executing the above-described method for IoT terminal devices to access the network. Specifically, please refer to... Figure 6 The Internet of Things (IoT) terminal device network access system 200 includes a first access unit 101, a first acquisition and transmission unit 102, and a second access unit 103 configured in the terminal, and a first correction unit 201 configured in the core network.

[0053] The first access unit 101 is used to allow the terminal to access the core network based on the ordinary DNN carried in the registration request if it initiates a registration request to the core network in a non-LADN area; the first acquisition and sending unit 102 is used to allow the terminal to acquire TA information corresponding to the LADN area from the base station if it moves to the LADN area, and send the TA information to the core network to trigger the core network to start the TA update function to obtain TA target information; the first correction unit 201 is used by the core network to correct the ordinary DNN based on the TA target information to obtain the LADN DNN; and the second access unit 103 is used by the terminal to rebuild the PDU session process with the core network using the LADN DNN to access the core network.

[0054] In some embodiments, such as this one, the first correction unit 201 includes a first matching unit, a correction subunit, and a usage unit.

[0055] The first matching unit is used by the core network to match the TA target information with a pre-configured user subscription information table to obtain a matching result; the correction subunit is used by the core network to correct the ordinary DNN to an LADN DNN if the matching result is a successful match; the use unit is used by the core network to continue using the ordinary DNN if the matching result is a failed match.

[0056] Another embodiment of the Internet of Things terminal device network access system 200 of the present invention adds a second acquisition and transmission unit and a third access unit configured in the terminal, and a second matching unit and a second correction unit configured in the core network, based on the above embodiment.

[0057] The second acquisition and sending unit is used to acquire the TA removal information corresponding to the current non-LADN area from the base station if the terminal moves out of the LADN area, and send the TA removal information to the core network to trigger the TA update function in the core network to obtain the TA removal target information; the second matching unit is used for the core network to match the TA removal target information with the user subscription information table; the second correction unit is used for the core network to correct the LADN DNN to the ordinary DNN if the matching result is a mismatch; the third access unit is used for the terminal to use the ordinary DNN to rebuild the PDU session process with the core network to access the core network.

[0058] Another embodiment of the Internet of Things terminal device network access system 200 of the present invention adds a subscription unit configured in the terminal and a configuration unit configured in the core network on the basis of the above embodiments.

[0059] The signing unit is used for the terminal to sign up for LADN DNN function and LADN DNN error correction function with the core network; the configuration unit is used for the core network to configure the user signing information table, wherein the user signing information table records the mapping relationship between TA information and LADN DNN.

[0060] It should be noted that those skilled in the art can clearly understand that the specific implementation process of the above-mentioned IoT terminal device network access system 200 and each unit can be referred to the corresponding description in the foregoing method embodiments. For the sake of convenience and brevity, it will not be repeated here.

[0061] The aforementioned IoT terminal device network access system can be implemented as a computer program, which can be used in, for example... Figure 7 It runs on the computer device shown.

[0062] Please see Figure 7 , Figure 7 This is a schematic block diagram of a computer device provided in an embodiment of this application. The computer device 900 is a terminal or a device with a core network.

[0063] See Figure 7 The computer device 900 includes a processor 902, a memory, and an interface 907 connected via a system bus 901, wherein the memory may include a storage medium 903 and internal memory 904.

[0064] The storage medium 903 may store an operating system 9031 and a computer program 9032. When the computer program 9032 is executed, it causes the processor 902 to execute a method for connecting an Internet of Things (IoT) terminal device to the network.

[0065] The processor 902 provides computing and control capabilities to support the operation of the entire computer device 900.

[0066] The internal memory 904 provides an environment for the operation of the computer program 9032 in the storage medium 903. When the computer program 9032 is executed by the processor 902, the processor 902 can execute a method for Internet of Things (IoT) terminal devices to access the network.

[0067] This interface 905 is used for communication with other devices. Those skilled in the art will understand that... Figure 7 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device 900 to which the present application is applied. The specific computer device 900 may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0068] The processor 902 of each of the terminal and the core network is used to run a computer program 9032 stored in the memory to implement the process steps of the above-described method embodiments.

[0069] It should be understood that in the embodiments of this application, the processor 902 may be a central processing unit (CPU), or it may be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor.

[0070] It will be understood by those skilled in the art that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a storage medium, which is a computer-readable storage medium. The computer program is executed by at least one processor in the wireless communication system to implement the process steps of the embodiments of the above methods.

[0071] Therefore, the present invention also provides a storage medium. This storage medium can be a computer-readable storage medium. The storage medium stores a computer program. When executed by a processor, the computer program causes the processor to perform any embodiment of the above-described method for connecting an IoT terminal device to the network.

[0072] The storage medium can be any computer-readable storage medium capable of storing program code, such as a USB flash drive, portable hard drive, read-only memory (ROM), magnetic disk, or optical disk.

[0073] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, wireless communication software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0074] In the embodiments provided by this invention, it should be understood that the disclosed systems and methods can be implemented in other ways. For example, the system embodiments described above are merely illustrative. For example, the division of each unit is only a logical functional division, and there may be other division methods in actual implementation. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed.

[0075] The steps in the method of this invention can be adjusted, merged, or reduced in order according to actual needs. The units in the system of this invention can be merged, divided, or reduced according to actual needs. Furthermore, the functional units in the various embodiments of this invention 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.

[0076] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a storage medium. Based on this understanding, the technical solution of the present invention, 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 wireless communication software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal wireless communication device, a terminal, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention.

[0077] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0078] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Since these modifications and variations fall within the scope of the claims and their equivalents, this invention also intends to include these modifications and variations.

[0079] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for IoT terminal devices to access the network, characterized in that, include: If a terminal initiates a registration request to the core network in a non-LADN area, it will access the core network according to the ordinary DNN carried in the registration request; If the terminal moves to the LADN area, it obtains the TA information corresponding to the LADN area from the base station and sends the TA information to the core network to trigger the core network to start the TA update function to obtain the TA target information; The core network corrects the ordinary DNN based on the TA target information to obtain the LADN DNN; The terminal uses the LADN DNN to reconstruct the PDU session with the core network in order to access the core network.

2. The method for IoT terminal devices to access the network according to claim 1, characterized in that, The core network corrects the ordinary DNN based on the TA target information to obtain an LADN DNN, including: The core network matches the TA target information with a pre-configured user subscription information table to obtain a matching result; If the matching result is successful, the core network will correct the ordinary DNN to an LADN DNN.

3. The method for IoT terminal devices to access the network according to claim 2, characterized in that, After the core network matches the TA target information with the pre-configured user subscription information table to obtain the matching result, it further includes: If the matching result is a failure, the core network continues to use the ordinary DNN.

4. The method for IoT terminal devices to access the network according to claim 2, characterized in that, The method further includes: If the terminal moves out of the LADN area, it obtains the TA move-out information corresponding to the current non-LADN area from the base station and sends the TA move-out information to the core network to trigger the TA update function in the core network to obtain the TA move-out target information.

5. The method for IoT terminal devices to access the network according to claim 4, characterized in that, After sending the TA removal information to the core network to trigger the TA update function in the core network to obtain the TA removal target information, the method further includes: The core network matches the target information for removing the TA with the user subscription information table; If the matching result is a mismatch, the core network will correct the LADN DNN to the ordinary DNN.

6. The method for IoT terminal devices to access the network according to claim 5, characterized in that, If the matching result indicates that the TA target information does not match the user contract information table, then after modifying the LADN DNN to the ordinary DNN, the method further includes: The terminal uses the ordinary DNN to reconstruct the PDU session with the core network in order to access the core network.

7. The method for IoT terminal devices to access the network according to claim 1, characterized in that, The method further includes: The terminal signs up for LADN DNN function and LADN DNN error correction function with the core network; The core network is configured with a user subscription information table, which records the mapping relationship between TA information and LADNN.

8. A network access system for Internet of Things (IoT) terminal devices, characterized in that, include: The first access unit, the first acquisition and transmission unit, and the second access unit are configured in the terminal, and the first correction unit is configured in the core network, wherein... The first access unit is used to allow the terminal to access the core network according to the ordinary DNN carried in the registration request if the terminal initiates a registration request to the core network in a non-LADN area; The first acquisition and transmission unit is used to acquire TA information corresponding to the LADN area from the base station if the terminal moves to the LADN area, and send the TA information to the core network to trigger the core network to start the TA update function to obtain the TA target information; The first correction unit is used by the core network to correct the ordinary DNN according to the TA target information to obtain an LADN DNN; The second access unit is used by the terminal to reconstruct the PDU session with the core network using the LADN DNN in order to access the core network.

9. A network access system for Internet of Things (IoT) terminal devices, characterized in that, The device includes a terminal and a core network. Both the terminal and the device carrying the core network include a memory and a processor. The memory stores a computer program. When the processor of the terminal and the core network executes the computer program, it implements the method as described in any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, The storage medium stores a computer program that, when executed by a processor, can implement the method as described in any one of claims 1-7.

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