Method and system for user to access data center, computer storage medium
By using the global network storage function, the H-NRF network element selects the nearest home location and guides the L-NRF network element of the target home location to find and send SMF network element information. This solves the user's need to access the regional data center nearby and enables flexible and low-cost network deployment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CHINA TELECOM CORP LTD
- Filing Date
- 2022-11-22
- Publication Date
- 2026-07-14
AI Technical Summary
Existing LBO and HR methods are difficult to meet the needs of enterprise users for accessing regional data centers nearby, and their configuration is complex and costly, making them difficult to promote.
The H-NRF network element with global network storage function is introduced. By receiving the SMF discovery request from the session management function, it selects the home location closest to the user and guides the L-NRF network element of the target home location to find and send the SMF network element information, so that the user can access the data center with a leased line connection through the SMF network element of the target home location.
It achieves flexible networking, low deployment cost, and allows users to access data centers nearby, reducing the cost of dedicated line connections.
Smart Images
Figure CN115802332B_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to the field of communication technology, and in particular to methods and systems for user access to data centers, and computer-storable media. Background Technology
[0002] 2B customized networks or 2B private networks have raised the need for access to the nearest regional data center. This means that enterprises deploy several regional data centers, and to reduce service latency, users roaming to different provinces need to access the nearest regional data center. Existing mobile network methods such as LBO (Local Breakout) and HR (Home Routeed) are insufficient to meet this requirement. LBO is also known as visited outbound, and HR is also known as home outbound.
[0003] In related technologies, 5G users use the LBO method to exit the core network and then connect to the nearby regional data center via a VPN (Virtual Private Network) or leased line through the IP bearer network. Summary of the Invention
[0004] The related technologies are complex to configure, and customers need to pay high leased line costs from each province to the corresponding data center, making them difficult to promote and implement.
[0005] To address the aforementioned technical issues, this disclosure proposes a solution that offers flexible networking and low deployment costs.
[0006] According to a first aspect of this disclosure, a method for a user to access a data center is provided, comprising: a global network storage function (H-NRF) network element receiving a session management function (SMF) discovery request from a local network storage function (L-NRF) network element of the user's currently visited location, wherein the SMF discovery request includes the user's tracking area code (TAC); the H-NRF network element selecting, from multiple home locations having leased line connections to the data center, the home location closest to the TAC as the target home location, wherein different home locations are connected to different data centers via different leased lines; the H-NRF network element sending the SMF discovery request to the L-NRF network element of the target home location, wherein the SMF discovery request is used to instruct the L-NRF network element of the target home location to locate and send the network element information of the target home location's SMF network element to the access and mobility management function (AMF) network element of the visited location, so as to enable the user to access the data center having a leased line connection to the target home location through the target home location's SMF network element.
[0007] In some embodiments, the SMF discovery request further includes a preferredTaiMatchInd=false identifier, a Public Land Network (PLMN), a Single Network Slice Selection Assist Information (S-NSSAI), and a Data Network Name (DNN), wherein the preferredTaiMatchInd=false identifier is used to guide the L-NRF network element of the target home location to find and send the network element information of the SMF network element of the target home location corresponding to the PLMN, S-NSSAI, and DNN to the AMF network element of the visited location.
[0008] In some embodiments, the method for a user to access a data center further includes: in response to receiving the preferredTaiMatchInd=false identifier, the L-NRF network element of the target home location searches for the corresponding SMF network element of the target home location based on the PLMN, S-NSSAI, and DNN; the L-NRF network element of the target home location sends the AMF network element of the visited location to the network element information of the searched SMF network element of the target home location, so as to enable the user to access the data center with a dedicated line connection to the target home location through the SMF network element of the target home location.
[0009] In some embodiments, the SMF discovery request is a secondary SMF discovery request, and the method for user access to the data center further includes: the L-NRF network element of the visited location receiving a first SMF discovery request from the AMF network element of the visited location, wherein the first SMF discovery request includes a Public Land Network (PLMN), a Single Network Slice Selection Assistance Information (S-NSSAI), and a Data Network Name (DNN); if the L-NRF network element of the visited location finds that there is no SMF network element corresponding to the DNN in the visited location, it returns a query result to the AMF network element of the visited location, wherein the query result includes a preferredTaiMatchInd=false identifier and the network element information of the SMF network element of the visited location, and the preferredTaiMatchInd=false identifier is used to guide the AMF network element of the visited location to send the secondary SMF discovery request to the L-NRF network element of the visited location.
[0010] In some embodiments, the method for a user to access a data center further includes: the AMF network element of the visited location, in response to receiving a PDU session establishment request from the user, sending the first SMF discovery request to the L-NRF network element of the visited location.
[0011] According to a second aspect of this disclosure, a system for user access to a data center is provided, comprising: a global network storage function (H-NRF) network element configured to: receive a session management function (SMF) discovery request from a local network storage function (L-NRF) network element of the currently visited location of the user, wherein the SMF discovery request includes the user's tracking area code (TAC); select, from multiple home locations having leased line connections to the data center, the home location closest to the TAC as the target home location, wherein different home locations are connected to different data centers via different leased lines; and send the SMF discovery request to the L-NRF network element of the target home location, wherein the SMF discovery request is used to instruct the L-NRF network element of the target home location to locate and send the network element information of the target home location's SMF network element to the access and mobility management function (AMF) network element of the visited location, so as to enable the user to access the data center having a leased line connection to the target home location through the target home location's SMF network element.
[0012] In some embodiments, the SMF discovery request further includes a preferredTaiMatchInd=false identifier, a Public Land Network (PLMN), a Single Network Slice Selection Assist Information (S-NSSAI), and a Data Network Name (DNN), wherein the preferredTaiMatchInd=false identifier is used to guide the L-NRF network element of the target home location to find and send the network element information of the SMF network element of the target home location corresponding to the PLMN, S-NSSAI, and DNN to the AMF network element of the visited location. In some embodiments,
[0013] In some embodiments, the system for user access to a data center further includes: the L-NRF network element of the target home location, configured to: in response to receiving the preferredTaiMatchInd=false identifier, search for the corresponding SMF network element of the target home location based on the PLMN, S-NSSAI, and DNN; send the AMF network element of the visited location to the network element information of the searched SMF network element of the target home location, so as to enable the user to access the data center with a leased line connection to the target home location through the SMF network element of the target home location.
[0014] In some embodiments, the SMF discovery request is a secondary SMF discovery request. The system for user access to the data center further includes: the L-NRF network element of the visited location, configured to: receive a first SMF discovery request from the AMF network element of the visited location, wherein the first SMF discovery request includes a Public Land Network (PLMN), Single Network Slice Selection Assistance Information (S-NSSAI), and a Data Network Name (DNN); if it is found that there is no SMF network element corresponding to the DNN in the visited location, return a query result to the AMF network element of the visited location, wherein the query result includes a preferredTaiMatchInd=false flag and the network element information of the SMF network element of the visited location, wherein the preferredTaiMatchInd=false flag is used to guide the AMF network element of the visited location to send the secondary SMF discovery request to the L-NRF network element of the visited location.
[0015] In some embodiments, the system for user access to a data center further includes: the visited AMF network element, configured to send the first SMF discovery request to the visited L-NRF network element in response to receiving a PDU session establishment request from the user.
[0016] According to a third aspect of this disclosure, a system for user access to a data center is provided, comprising: a memory; and a processor coupled to the memory, the processor being configured to execute the method for user access to a data center as described in any of the above embodiments based on instructions stored in the memory.
[0017] According to a fourth aspect of this disclosure, a computer-storeable medium is provided having computer program instructions stored thereon, which, when executed by a processor, implement the method for user access to a data center as described in any of the above embodiments.
[0018] In the above embodiments, the networking is flexible and the deployment cost is low. Attached Figure Description
[0019] The accompanying drawings, which form part of this specification, illustrate embodiments of this disclosure and, together with the specification, serve to explain the principles of this disclosure.
[0020] This disclosure will become clearer with reference to the accompanying drawings and the following detailed description, wherein:
[0021] Figure 1 This is a flowchart illustrating a method for a user to access a data center according to some embodiments of the present disclosure;
[0022] Figure 2This is a block diagram illustrating a system for user access to a data center according to some embodiments of the present disclosure;
[0023] Figure 3 This is a signaling diagram illustrating a method for a user to access a data center according to some embodiments of the present disclosure;
[0024] Figure 4 This is a schematic diagram illustrating a method for a user to access a data center according to some embodiments of the present disclosure;
[0025] Figure 5 This is a block diagram illustrating a system for user access to a data center according to other embodiments of the present disclosure;
[0026] Figure 6 This is a block diagram illustrating a computer system for implementing some embodiments of the present disclosure. Detailed Implementation
[0027] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values of the components and steps set forth in these embodiments do not limit the scope of the present disclosure.
[0028] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.
[0029] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this disclosure or its application or use.
[0030] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.
[0031] In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.
[0032] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.
[0033] Figure 1 This is a flowchart illustrating a method for a user to access a data center according to some embodiments of the present disclosure.
[0034] like Figure 1 As shown, the method for users to access the data center includes steps S110-S130.
[0035] In step S110, the H-NRF (Home Network Repository Function) network element receives an SMF (Session Management Function) discovery request from the L-NRF network element of the user's currently visited location. The SMF discovery request includes the user's TAC (Tracking Area Code). The H-NRF is also known as the backbone NRF.
[0036] In some embodiments, the SMF discovery request also includes the preferredTaiMatchInd=false flag, PLMN (Public Land Mobile Network), S-NSSAI (Single Network Slice Selection Assistance Information), and DNN (Data Network Name). The preferredTaiMatchInd=false flag guides the L-NRF network element of the target home location to find and send the network element information of the target home location's SMF network element corresponding to the PLMN, S-NSSAI, and DNN to the visited AMF network element. The message carries the "preferredtaiMatchInd:false" field, which indicates that the SMF was matched without utilizing the preferredtai parameter.
[0037] In step S120, the H-NRF network element selects the location closest to the TAC from multiple locations with leased line connections to the data center as the target location. Different locations are connected to different data centers via different leased lines.
[0038] In step S130, the H-NRF network element sends an SMF discovery request to the L-NRF network element of the target home location. The SMF discovery request is used to guide the L-NRF network element of the target home location to find and send the network element information of the SMF network element of the target home location to the AMF (Access and Mobility Management Function) network element of the visited location, so as to enable the user to access the data center with a leased line connection to the target home location through the SMF network element of the target home location.
[0039] In some embodiments, upon receiving the preferredTaiMatchInd=false flag, the L-NRF network element of the target home location searches for the corresponding SMF network element of the target home location based on the PLMN, S-NSSAI, and DNN; and sends the AMF network element of the visited location to the network element information of the searched SMF network element of the target home location, so as to enable the user to access the data center with a leased line connection to the target home location through the SMF network element of the target home location.
[0040] In some embodiments, the aforementioned SMF discovery request is a secondary SMF discovery request, meaning that the L-NRF network element in the visited location has already received the initial SMF discovery request. For example, the L-NRF network element in the visited location receives the initial SMF discovery request from the AMF network element in the visited location, wherein the initial SMF discovery request includes the Public Land Network (PLMN), Single Network Slice Selection Assistance Information (S-NSSAI), and Data Network Name (DNN); and if it finds that there is no SMF network element corresponding to the DNN in the visited location, it returns the query result to the AMF network element in the visited location.
[0041] The query results include the preferredTaiMatchInd=false flag and the network element information of the visited SMF network element. The preferredTaiMatchInd=false flag is used to guide the visited AMF network element to send a secondary SMF discovery request to the visited L-NRF network element.
[0042] In some embodiments, the AMF network element in the visited location sends an initial SMF discovery request to the L-NRF network element in the visited location in response to receiving a PDU session establishment request from the user.
[0043] In the above embodiments, the concept of multi-homed networks is introduced, and the H-NRF is enhanced with the function of selecting the SMF of the home core network based on the user's location (TAC) for a specific DNN. The core network of the province where the regional data center is located is designated as the home core network, and the regional data center is connected to the provincial core network via leased lines or other means. Users adopt the HR (Home Network Outgoing) method. When a user goes online, the H-NRF queries the specified DNN based on the user's access location (TAC) of the 5G network and selects the nearest home core network SMF as the H-SMF. This enables the selection of a nearby core network SMF / UPF connected to the regional data center to carry services for the user, which has the advantages of flexible networking and low deployment cost.
[0044] Figure 2 This is a block diagram illustrating a system for user access to a data center according to some embodiments of the present disclosure.
[0045] like Figure 2As shown, system 2 for user access to the data center includes H-NRF network element 21.
[0046] H-NRF element 21 is configured to receive Session Management Function (SMF) discovery requests from the Local Network Storage Function (L-NRF) element of the user's current visited location. The SMF discovery request includes the user's Tracking Area Code (TAC).
[0047] In some embodiments, the SMF discovery request further includes the preferredTaiMatchInd=false flag, PLMN, S-NSSAI, and DNN. The preferredTaiMatchInd=false flag is used to guide the L-NRF network element of the target home location to find and send the network element information of the SMF network element of the target home location corresponding to the PLMN, S-NSSAI, and DNN to the visited AMF network element.
[0048] H-NRF element 21 is also configured to select the home location closest to the TAC from multiple home locations with leased line connections to the data center as the target home location. Different home locations are connected to different data centers via different leased lines.
[0049] H-NRF element 21 is also configured to send an SMF discovery request to the L-NRF element of the target home location. The SMF discovery request is used to guide the L-NRF element of the target home location to find and send the network element information of the SMF element of the target home location to the Access and Mobility Management Function (AMF) element of the visited location, so as to enable the user to access the data center with a leased line connection to the target home location through the SMF element of the target home location.
[0050] In some embodiments, the system 2 for user access to the data center further includes an L-NRF network element 22 of the target home location.
[0051] The L-NRF network element 22 of the target home location is configured to: in response to receiving the preferredTaiMatchInd=false flag, look up the corresponding SMF network element of the target home location according to PLMN, S-NSSAI and DNN; send the AMF network element of the visited location to the network element information of the SMF network element of the target home location, so as to enable the user to access the data center with a leased line connection to the target home location through the SMF network element of the target home location.
[0052] In some embodiments, the SMF discovery request received by the H-NRF network element is a secondary SMF discovery request. The system 2 for user access to the data center also includes an L-NRF network element 23 for the visited location.
[0053] The L-NRF network element 23 of the visited site is configured as follows:
[0054] Receive the first SMF discovery request from the AMF network element in the visited location. The first SMF discovery request includes the Public Land Network (PLMN), Single Network Slice Selection Assistance Information (S-NSSAI), and Data Network Name (DNN).
[0055] If no SMF network element corresponding to the DNN is found in the visited location, the query result is returned to the AMF network element in the visited location. The query result includes the preferredTaiMatchInd=false flag and the network element information of the SMF network element in the visited location. The preferredTaiMatchInd=false flag is used to guide the AMF network element in the visited location to send a second SMF discovery request to the L-NRF network element in the visited location.
[0056] In some embodiments, the system 2 for user access to the data center further includes a visited AMF network element 24. The visited AMF network element 24 is configured to send an initial SMF discovery request to the visited L-NRF network element in response to receiving a PDU session establishment request from a user.
[0057] Figure 3 This is a signaling diagram illustrating a method for a user to access a data center according to some embodiments of the present disclosure.
[0058] like Figure 3 As shown, the method for user access to the data center includes steps S310-S370.
[0059] In step S310, the user, i.e., the UE, initiates a PDU session establishment request to the AMF network element.
[0060] In step S320, after receiving the PDU session establishment request, the AMF network element initiates the first SMF discovery request to the L-NRF network element of the visited location. The first SMF discovery request carries the DNN.
[0061] In step S330, the L-NRF network element of the visited location finds that there is no SMF network element in its province corresponding to the DNN, and returns the query result to the AMF network element. The message returning the query result carries preferredTaiMatchInd=false and the corresponding visited location V-SMF information.
[0062] In step S340, after receiving the response from the visited L-NRF network element, the AMF network element will initiate a secondary SMF discovery request to the visited L-NRF network element. In addition to carrying the preferredTaiMatchInd=false flag, PLMN, S-NSSAI, DNN, and other information, the secondary SMF discovery request message must also carry TAC or TACNR.
[0063] In step S350, the L-NRF network element of the visited location forwards the secondary SMF discovery request message to the H-NRF network element.
[0064] In step S360, the H-NRF network element, for the DNN specified by the user, finds the neighboring province as the home network according to the TAC, and forwards the message of the secondary SMF discovery request to the L-NRF network element of that province (i.e. the target home location).
[0065] In step S370, the L-NRF network element of the neighboring province (i.e., the target home location) searches for and returns the corresponding home location SMF (i.e., H-SMF information) to the AMF network element of the visited location based on S-NSSAI, DNN, etc.
[0066] In the above embodiments, the concept of multi-homed networks is introduced, and the H-NRF is enhanced with the function of selecting the home core network SMF (H-SMF) based on the user's location TAC for a specific DNN. When a user goes online using the HR (Head-Home) approach, the HNRF queries the specified DNN for the home core network SMF information corresponding to the user's location (TAC) accessing the 5G network. This allows the HNRF to select the SMF / UPF connected to the nearest regional data center to carry the user's services, enabling users to access data centers in the nearest region. This approach offers advantages such as flexible networking and low deployment costs.
[0067] Figure 4 This is a schematic diagram illustrating a method for a user to access a data center according to some embodiments of the present disclosure.
[0068] like Figure 4 As shown, for users in visited provinces 1 to n, a secondary SMF discovery request can be sent from the L-NRF network element of the visited province to the H-NRF network element. The H-NRF network element then selects a neighboring home province from home provinces 1, 2, ..., n based on the user's TAC and forwards the secondary SMF discovery request message to the L-NRF network element of the neighboring home province. Home provinces 1 to n are connected to data centers 1 to m via dedicated lines.
[0069] The L-NRF network element of the home province selects the corresponding SMF network element of the home province and returns the network element information of the SMF network element of the home province to the AMF network element of the visited province. The SMF network element of the home province interacts with the corresponding data center through the leased line between the UPF (User plane function) network element of the home province and the corresponding data center. The visited province also includes the SMF network element and the UPF network element of the visited province.
[0070] This disclosure adopts a multi-HR (Home Network) + leased line approach to enable users to access the regional data center from the nearest location. It improves the logic of H-NRF selecting the home province based solely on the DNN province label by adding the function of H-NRF to select the appropriate province 5GC as the home network for a specified DNN based on the user's access visit location 5GC location information TAC. It forwards the SMF discovery request to the L-NRF of the neighboring province 5GC that has a leased line connection with the data center and selects the SMF of the neighboring province as the home SMF (A-SMF), thus enabling users to access the data center from the nearest location.
[0071] Figure 5 This is a block diagram illustrating a system for user access to a data center according to other embodiments of the present disclosure.
[0072] like Figure 5 As shown, system 5 for user access to a data center includes a memory 51 and a processor 52 coupled to the memory 51. The memory 51 stores instructions for executing methods corresponding to embodiments of the user access to a data center. The processor 52 is configured to execute methods for user access to a data center according to any of the embodiments of this disclosure based on the instructions stored in the memory 51.
[0073] Figure 6 This is a block diagram illustrating a computer system for implementing some embodiments of the present disclosure.
[0074] like Figure 6 As shown, the computer system 60 can be represented in the form of a general computing device. The computer system 60 includes a memory 610, a processor 620, and a bus 600 connecting different system components.
[0075] The memory 610 may include, for example, system memory, non-volatile storage media, etc. The system memory may store, for example, an operating system, applications, a boot loader, and other programs. The system memory may include volatile storage media, such as random access memory (RAM) and / or cache memory. The non-volatile storage media may store, for example, instructions for executing at least one of the corresponding embodiments of the methods for user access to a data center. Non-volatile storage media include, but are not limited to, disk storage, optical storage, flash memory, etc.
[0076] The processor 620 can be implemented using a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete hardware components such as discrete gates or transistors. Accordingly, each module, such as the decision module and the determination module, can be implemented by executing instructions in the central processing unit (CPU) memory to perform the corresponding steps, or by implementing dedicated circuitry to perform the corresponding steps.
[0077] Bus 600 can use any of the various bus architectures. For example, bus architectures include, but are not limited to, Industry Standard Architecture (ISA) bus, Micro Channel Architecture (MCA) bus, and Peripheral Component Interconnect (PCI) bus.
[0078] The computer system 60 may also include an input / output interface 630, a network interface 640, and a storage interface 650. These interfaces 630, 640, and 650, as well as the memory 610 and processor 620, can be connected via a bus 600. The input / output interface 630 provides a connection interface for input / output devices such as a monitor, mouse, and keyboard. The network interface 640 provides a connection interface for various networked devices. The storage interface 650 provides a connection interface for external storage devices such as floppy disks, USB flash drives, and SD cards.
[0079] Various aspects of this disclosure are described herein with reference to flowchart illustrations and / or block diagrams of methods, apparatus, and computer program products according to embodiments of this disclosure. It should be understood that each block of the flowchart illustrations and / or block diagrams, and combinations thereof, can be implemented by computer-readable program instructions.
[0080] These computer-readable program instructions are provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable device to produce a machine, such that execution of the instructions by the processor produces means for implementing the functions specified in one or more boxes of the flowchart and / or block diagram.
[0081] These computer-readable program instructions may also be stored in a computer-readable storage medium. These instructions cause a computer to work in a particular manner to produce an article of manufacture, including instructions that implement the functions specified in one or more boxes in a flowchart and / or block diagram.
[0082] This disclosure may take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects.
[0083] The method and system for user access to the data center and the computer storage medium described in the above embodiments offer flexible networking and low deployment costs.
[0084] This concludes the detailed description of the method and system for user access to a data center, and the computer-storable medium according to this disclosure. To avoid obscuring the concept of this disclosure, some details known in the art have not been described. Those skilled in the art will fully understand how to implement the technical solutions disclosed herein based on the above description.
Claims
1. A method for user access to a data center, comprising: The global network storage function (H-NRF) network element receives a session management function (SMF) discovery request from the local network storage function (L-NRF) network element of the currently visited location of the user. The SMF discovery request includes the user's tracking area code (TAC). The SMF discovery request is a secondary SMF discovery request. The first SMF discovery request is sent by the access and mobility management function (AMF) network element of the visited location to the L-NRF network element of the visited location in response to receiving a PDU session establishment request from the user. The H-NRF network element selects the home location closest to the TAC from multiple home locations that have leased line connections to the data center as the target home location, wherein different home locations are connected to different data centers through different leased lines; The H-NRF network element sends the SMF discovery request to the L-NRF network element of the target home location. The SMF discovery request is used to guide the L-NRF network element of the target home location to find and send the network element information of the SMF network element of the target home location to the Access and Mobility Management Function (AMF) network element of the visited location, so as to enable the user to access the data center with a leased line connection to the target home location through the SMF network element of the target home location.
2. The method for user access to a data center according to claim 1, wherein, The SMF discovery request also includes the preferredTaiMatchInd=false identifier, Public Land Network (PLMN), Single Network Slice Selection Assist Information (S-NSSAI), and Data Network Name (DNN). The preferredTaiMatchInd=false identifier is used to guide the L-NRF network element of the target home location to find and send the network element information of the SMF network element of the target home location corresponding to the PLMN, S-NSSAI, and DNN to the AMF network element of the visited location.
3. The method for user access to a data center according to claim 2, further comprising: In response to receiving the preferredTaiMatchInd=false identifier, the L-NRF network element of the target home location searches for the corresponding SMF network element of the target home location based on the PLMN, S-NSSAI, and DNN. The L-NRF network element of the target home location sends the network element information of the SMF network element of the target home location to the AMF network element of the visited location, so that the user can access the data center with a dedicated line connection to the target home location through the SMF network element of the target home location.
4. The method for user access to a data center according to claim 2, wherein, The method for user access to the data center also includes: The L-NRF network element of the visited location receives the first SMF discovery request from the AMF network element of the visited location, wherein the first SMF discovery request includes the Public Land Network (PLMN), Single Network Slice Selection Assistance Information (S-NSSAI), and Data Network Name (DNN). If the L-NRF network element of the visited location finds that there is no SMF network element corresponding to the DNN in the visited location, it returns a query result to the AMF network element of the visited location. The query result includes the preferredTaiMatchInd=false flag and the network element information of the SMF network element of the visited location. The preferredTaiMatchInd=false flag is used to guide the AMF network element of the visited location to send the secondary SMF discovery request to the L-NRF network element of the visited location.
5. A system for user access to a data center, comprising: The global network storage function H-NRF network element is configured as follows: The system receives a Session Management Function (SMF) discovery request from the Local Network Storage Function (L-NRF) element of the currently visited location of the user. The SMF discovery request includes the user's Tracking Area Code (TAC). The SMF discovery request is a secondary SMF discovery request. The first SMF discovery request is sent by the Access and Mobility Management Function (AMF) element of the visited location to the L-NRF element of the visited location in response to receiving a PDU session establishment request from the user. From multiple home locations that have leased line connections to the data center, select the home location closest to the TAC as the target home location, wherein different home locations are connected to different data centers through different leased lines; The SMF discovery request is sent to the L-NRF network element of the target home location. The SMF discovery request is used to guide the L-NRF network element of the target home location to find and send the network element information of the SMF network element of the target home location to the Access and Mobility Management Function (AMF) network element of the visited location, so as to enable the user to access the data center with a leased line connection to the target home location through the SMF network element of the target home location.
6. The system for user access to a data center according to claim 5, wherein, The SMF discovery request also includes the preferredTaiMatchInd=false identifier, Public Land Network (PLMN), Single Network Slice Selection Assist Information (S-NSSAI), and Data Network Name (DNN). The preferredTaiMatchInd=false identifier is used to guide the L-NRF network element of the target home location to find and send the network element information of the SMF network element of the target home location corresponding to the PLMN, S-NSSAI, and DNN to the AMF network element of the visited location.
7. The system for user access to a data center according to claim 6, further comprising: The L-NRF network element of the target home location is configured as follows: In response to receiving the preferredTaiMatchInd=false flag, the corresponding SMF network element of the target location is found according to the PLMN, S-NSSAI and DNN; The network element information of the SMF network element of the target home location is sent to the AMF network element of the visited location, so that the user can access the data center with a dedicated line connection to the target home location through the SMF network element of the target home location.
8. The system for user access to a data center according to claim 6, wherein, The system for user access to the data center also includes: The L-NRF network element of the visited location is configured as follows: Receive the first SMF discovery request from the AMF network element of the visited location, wherein the first SMF discovery request includes the Public Land Network (PLMN), Single Network Slice Selection Assistance Information (S-NSSAI), and Data Network Name (DNN); If it is found that there is no SMF network element corresponding to the DNN in the visited location, the query result is returned to the AMF network element of the visited location. The query result includes the preferredTaiMatchInd=false flag and the network element information of the SMF network element of the visited location. The preferredTaiMatchInd=false flag is used to guide the AMF network element of the visited location to send the secondary SMF discovery request to the L-NRF network element of the visited location.
9. A system for user access to a data center, comprising: Memory; as well as A processor coupled to the memory, the processor being configured to execute, based on instructions stored in the memory, the method for user access to a data center as described in any one of claims 1 to 4.
10. A computer-storeable medium having stored thereon computer program instructions that, when executed by a processor, implement the method for user access to a data center as described in any one of claims 1 to 4.