Disaster recovery backup method and device, nonvolatile storage medium and electronic equipment

Abstract

The invention discloses a disaster recovery backup method and device, a nonvolatile storage medium and electronic equipment. The method comprises the following steps: a session management function unit in the disaster recovery backup system configures service ranges of a first user plane function server and a second user plane function server of a user plane function network element according to preset configuration information; after the session management function unit detects that the first user plane function server fails, session information of a first user session carried by the first user plane function server is deleted; and after detecting that the fault of the first user plane function server is recovered, indicating a second user session to transmit data through the first user plane function server under the condition that the second user session is received and the first user plane function server is appointed as a shunting anchor point in the second user session. The technical problems of single-point fault hidden danger and low resource utilization rate caused by single-point deployment of a user plane function in the prior art are solved.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a disaster recovery backup method, device, non-volatile storage medium and electronic device. Background Art

[0002] With the rapid development of 5G networks, the user plane function (UPF), as a key component of the 5G core network, is responsible for packet routing and forwarding, and has extremely high requirements for business continuity. However, the existing UPF deployment has the risk of single point failure and is insufficient in cross-data center (DC) disaster recovery.

[0003] To address the above-mentioned problems, no effective solution has been proposed yet. Summary of the invention

[0004] The embodiments of the present application provide a disaster recovery backup method, device, non-volatile storage medium and electronic device to at least solve the technical problems of single point failure hidden dangers and low resource utilization caused by single point deployment of user plane functions in the prior art.

[0005] According to one aspect of an embodiment of the present application, a disaster recovery backup method is provided, including: a session management function unit in a disaster recovery backup system configures a service range of a first user plane function server and a second user plane function server of a user plane function network element according to preset configuration information, wherein the user plane function network element is arranged in the disaster recovery backup system, the preset configuration information includes a tracking area code of a preset park, and the user plane function network element is used as a disaster recovery backup user plane function network element of each park within the service range, and is used to process sessions within each park; after the session management function unit detects a failure of the first user plane function server, the session information of the first user session carried by the first user plane function server is deleted, and the first user session is instructed to transmit data through the second user plane function server, wherein the first user session is a session within the service range; after detecting that the failure of the first user plane function server is recovered, when a second user session is received and the first user plane function server is specified as a diversion anchor point in the second user session, the second user session is instructed to transmit data through the first user plane function server.

[0006] Optionally, the disaster recovery backup system also includes a first service switch, a second service switch and a management switch, wherein the first user plane function server and the second user plane function server are connected through a heartbeat interface; the first user plane function server and the first service switch are connected through a first preset interface, and the second user plane function server and the second service switch are connected through a second preset interface, wherein the interface types of the first preset interface include: N3 interface, N6 interface, N4 interface and N9 interface, and the types of the second preset interface include: N3 interface, N6 interface, N4 interface and N9 interface; the first user plane function server and the management switch are connected through a third preset interface, and the second user plane function server and the management switch are connected through a fourth preset interface, wherein the interface types of the third preset interface include an intelligent platform management interface and an operation management and maintenance interface, and the interface types of the fourth preset interface include an intelligent platform management interface and an operation management and maintenance interface.

[0007] Optionally, the disaster recovery backup system also includes multiple bearer network devices, wherein the bearer network devices and the first service switch and the second service switch are connected via Ethernet; the first service switch, the second service switch and the management switch are all connected via Ethernet; the first service switch and the second service switch are connected via Ethernet.

[0008] Optionally, the various parks within the service scope include first-type parks and second-type parks, wherein the user plane function network element is interconnected with each first-park user plane function network element in the first-type park through a dedicated line, wherein the user plane function network element is used to process the sessions of each first-park user plane function network element, and the first-park user plane network element is a subordinate node of the user plane function network element; the user plane function network element is interconnected with each second-park user plane function network element in the second-type park through a dedicated line, wherein the user plane function network element is used as a disaster recovery backup user plane function network element of the second-park user plane function network element.

[0009] Optionally, the service escape channel between the second park user plane functional network element and the user plane functional network element is composed of the second park user plane functional network element, the first network switching device in the disaster recovery backup system, the first router and the second router in the bearer network, the second network switching device in the disaster recovery backup system and the user plane functional network element connected in sequence.

[0010] Optionally, the capacity of the user plane function network element in the disaster recovery backup system includes basic capacity and disaster recovery capacity, wherein the basic capacity is equal to the sum of the capacities of each first park user plane function network element in the first type of park, and the disaster recovery capacity is equal to the sum of the capacities of each second park user plane function network element in the second type of park.

[0011] Optionally, the disaster recovery backup method also includes: determining a set of preset park numbers corresponding to the disaster recovery backup system, wherein the set of preset park numbers includes multiple alternative preset park numbers, and the preset park number is the number of parks that share a set of disaster recovery backup system; determining the fault conflict probability corresponding to each preset park number, wherein the fault conflict probability is the probability that at least two parks among the multiple parks corresponding to the same disaster recovery backup system fail at the same time, and the fault conflict probability is used to determine the target park number from the set of preset park numbers.

[0012] According to another aspect of an embodiment of the present application, a disaster recovery backup device is also provided, including: a first processing module, used to configure the service range of a first user plane function server and a second user plane function server of a user plane function network element according to preset configuration information, wherein the preset configuration information includes a tracking area code of a preset park, and the user plane function network element is used as a disaster recovery backup user plane function network element of each park within the service range, and is used to process sessions within each park; a second processing module, used to delete the session information of the first user session carried by the first user plane function server after the session management function unit detects a failure of the first user plane function server, and instruct the first user session to transmit data through the second user plane function server, wherein the first user session is a session within the service range; a third processing module, used to instruct the second user session to transmit data through the first user plane function server after detecting that the first user plane function server has recovered from the failure, when the second user session is received and the first user plane function server is specified as a diversion anchor point in the second user session.

[0013] According to another aspect of an embodiment of the present application, a non-volatile storage medium is provided, in which a program is stored, wherein when the program is running, a device where the non-volatile storage medium is located is controlled to execute a disaster recovery backup method.

[0014] According to another aspect of an embodiment of the present application, there is further provided an electronic device, including: a memory and a processor, the processor being configured to run a program stored in the memory, wherein the disaster recovery backup method is executed when the program is running.

[0015] According to another aspect of an embodiment of the present application, a computer program product is also provided, including a computer program, and when the computer program is executed by a processor, a disaster recovery backup method is implemented.

[0016] In an embodiment of the present application, a session management function unit in a disaster recovery backup system is used to configure the service range of a first user plane function server and a second user plane function server of a user plane function network element according to preset configuration information, wherein the user plane function network element is arranged in the disaster recovery backup system, the preset configuration information includes a tracking area code of a preset park, and the user plane function network element is used as a disaster recovery backup user plane function network element of each park within the service range, and is used to process sessions within each park; after the session management function unit detects a failure of the first user plane function server, the session information of the first user session carried by the first user plane function server is deleted, and the first user session is instructed Data is transmitted through the second user plane function server, wherein the first user session is a session within the service scope; after detecting that the first user plane function server has recovered from a fault, when the second user session is received and the first user plane function server is specified as a diversion anchor point in the second user session, the second user session is instructed to transmit data through the first user plane function server. By deploying a centralized shared UPF, the purpose of cross-DC level disaster recovery and load sharing is achieved, thereby achieving the technical effect of improving the stability of the 5G network and the utilization of the UPF, and further solving the technical problems of single point failure hazards and low resource utilization caused by the single point deployment of user plane functions in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0018] Figure 1 is a structural schematic diagram of a computer terminal provided according to an embodiment of the present application;

[0019] Figure 2 It is a flowchart of a disaster recovery backup method provided according to an embodiment of the present application;

[0020] Figure 3 is a schematic diagram of an optional architecture of a user plane function network element according to an embodiment of the present application;

[0021] Figure 4 is a schematic diagram of an optional disaster recovery topology according to an embodiment of the present application;

[0022] Figure 5 is a schematic diagram of an optional GRE tunnel according to an embodiment of the present application;

[0023] Figure 6 It is a schematic diagram of the structure of a disaster recovery backup device provided according to an embodiment of the present invention. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0025] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0026] In order to better understand the embodiments of the present application, the technical terms involved in the embodiments of the present application are explained as follows:

[0027] 5G UPF (User Plane Function): 5G UPF is a key user plane network element of the 5G core network, responsible for packet routing and forwarding, supporting edge computing and network slicing, and realizing low-latency, large-bandwidth services. As the connection anchor point between 5G and MEC (Multi-access Edge Computing), it can be flexibly deployed at the edge of the network to promote local data offloading and efficient processing. UPF is controlled by SMF (Session Management Function) and executes policies to ensure accurate data transmission. It is the cornerstone of efficient data processing and widespread application of 5G networks, and promotes the in-depth development of digital transformation.

[0028] Disaster Tolerance: Disaster tolerance refers to maintaining uninterrupted operation of the survival system while minimizing data loss in the production system when natural disasters, equipment failures, human-caused damage, and other accidents occur.

[0029] Cross-DC disaster recovery: Cross-data center disaster recovery refers to establishing backup data centers in different geographical locations to ensure that data and services can be quickly restored in the event of a disaster.

[0030] At present, the scale of 5G customized network service construction is gradually expanding. UPF (User Plane Function) as the core network element for forwarding data traffic must maintain its high reliability to meet the requirements of business continuity. At present, most of the UPF devices built in the network are single-point, with single-point hidden dangers and large numbers. If the ratio of primary and backup devices is 1:1, the maintenance volume and investment will increase greatly, and a reliable disaster recovery method must be customized to ensure business continuity when a failure occurs. At the same time, due to the limited level of network element disaster recovery, dual-machine disaster recovery is generally adopted: two devices are used for disaster recovery, and there is a problem of low equipment utilization. Moreover, the two devices are deployed in one data center, which does not meet the requirements of cross-data center DC-level and cross-network element-level disaster recovery. Therefore, in actual operation, a more convenient and accurate method is needed to perform disaster recovery backup for UPF.

[0031] In order to solve the above problems, relevant solutions are provided in the embodiments of the present application, which are described in detail below.

[0032] According to an embodiment of the present application, a method embodiment of a disaster recovery backup method is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0033] The method embodiments provided in the embodiments of the present application can be executed in a mobile terminal, a computer terminal or a similar computing device. Figure 1 FIG. 1 shows a hardware structure block diagram of a computer terminal (or mobile device) for implementing a disaster recovery backup method. Figure 1 As shown, the computer terminal 10 (or mobile device 10) may include one or more (102a, 102b, ..., 102n are used to illustrate) processors 102 (the processor 102 may include but is not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA), a memory 104 for storing data, and a transmission device 106 for communication functions. In addition, it may also include: a display, an input / output interface (I / O interface), a universal serial bus (USB) port (which may be included as one of the ports of the BUS bus), a network interface, a power supply and / or a camera. It can be understood by those skilled in the art that Figure 1 The structure shown is only for illustration and does not limit the structure of the above electronic device. Figure 1 More or fewer components as shown, or with Figure 1 Different configurations are shown.

[0034] It should be noted that the one or more processors 102 and / or other data processing circuits described above may generally be referred to herein as "data processing circuits". The data processing circuits may be embodied in whole or in part as software, hardware, firmware, or any other combination thereof. In addition, the data processing circuit may be a single independent processing module, or may be incorporated in whole or in part into any of the other components in the computer terminal 10 (or mobile device). As described in the embodiments of the present application, the data processing circuit acts as a processor control (e.g., selection of a variable resistor terminal path connected to an interface).

[0035] The memory 104 can be used to store software programs and modules of application software, such as the program instructions / data storage device corresponding to the disaster recovery backup method in the embodiment of the present application. The processor 102 executes various functional applications and data processing by running the software programs and modules stored in the memory 104, that is, the above-mentioned disaster recovery backup method is realized. The memory 104 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 104 may further include a memory remotely arranged relative to the processor 102, and these remote memories may be connected to the computer terminal 10 via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof.

[0036] The transmission device 106 is used to receive or send data via a network. The specific example of the above network may include a wireless network provided by a communication provider of the computer terminal 10. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, NIC), which can be connected to other network devices through a base station so as to communicate with the Internet. In one example, the transmission device 106 can be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0037] The display may be, for example, a touch screen liquid crystal display (LCD) that enables a user to interact with a user interface of the computer terminal 10 (or mobile device).

[0038] In the above operating environment, the present application embodiment provides a disaster recovery backup method, such as Figure 2 As shown, the method comprises the following steps:

[0039] Step S202: The session management function unit in the disaster recovery backup system configures the service ranges of the first user plane function server and the second user plane function server of the user plane function network element according to the preset configuration information, wherein the user plane function network element is arranged in the disaster recovery backup system, the preset configuration information includes the tracking area code of the preset park, and the user plane function network element is used as a disaster recovery backup user plane function network element of each park within the service range, and is used to process sessions in each park;

[0040] Optionally, the user plane function network element is deployed in a load sharing manner, and UPF-1 (first user plane function server) / UPF-2 (second user plane function server) is split to form a service pool, and the two UPF servers are connected to the enterprise intranet respectively; the service configuration for SMF (Session Management Function, session management function unit) and the switch specifically includes:

[0041] 1) SMF: configure the service range of UPF-1 / UPF-2 to be the tracking area code of the park, where UPF-1 / UPF-2: configure the same UE (User Equipment) external address pool, and configure the dynamic routing protocol to publish the UE downlink route;

[0042] 2) Switch: Perform normal networking configuration between the switch and UPF1 / 2, and configure dynamic routing protocol;

[0043] Optionally, if the switch is connected to the enterprise intranet using the GRE protocol, and the GRE protocol endpoint is on the UPF, only the active / standby mode can be used;

[0044] In the technical solution provided in step S202, the disaster recovery backup system also includes a first service switch, a second service switch and a management switch, wherein the first user plane function server and the second user plane function server are connected through a heartbeat interface; the first user plane function server and the first service switch are connected through a first preset interface, and the second user plane function server and the second service switch are connected through a second preset interface, wherein the interface types of the first preset interface include: N3 interface, N6 interface, N4 interface and N9 interface, and the types of the second preset interface include: N3 interface, N6 interface, N4 interface and N9 interface; the first user plane function server and the management switch are connected through a third preset interface, and the second user plane function server and the management switch are connected through a fourth preset interface, wherein the interface types of the third preset interface include an intelligent platform management interface and an operation management and maintenance interface, and the interface types of the fourth preset interface include an intelligent platform management interface and an operation management and maintenance interface.

[0045] In the technical solution provided in step S202, the disaster recovery backup system also includes multiple bearer network devices, wherein the bearer network devices and the first service switch and the second service switch are connected via Ethernet; the first service switch, the second service switch and the management switch are all connected via Ethernet; and the first service switch and the second service switch are connected via Ethernet.

[0046] Optionally, the city deploys a centralized shared UPF (i.e., the user plane function network element in the disaster recovery backup system) as the service anchor point of the type A campus (dedicated campus sunk to the enterprise) (i.e., the user plane function network element is used to process sessions within each A campus), and also serves as the disaster recovery UPF sunk to the campus (i.e., as the disaster recovery backup user plane function network element of the campus that is remote from the remote shared UPF) Figure 3 The architecture diagram of the user plane functional network element is shown in FIG. Figure 3 As shown, the UPF network element is used as a user plane control network element, which is composed of 2*UPF servers, 2*service switches, and 1*management switch. The UPF adopts m-lag or stacking mode; Server 1 (first user plane function server)-Server 2 (second user plane function server): data synchronization and heartbeat detection are realized through the heartbeat interface to achieve high availability of the two UPF servers; Service switch-server: through the configuration of N3 / N6 / N4 / N9 vlan interconnection (that is, the first user plane function server and the first service switch are connected through the first preset interface, and the second user plane function server and the second service switch are connected through the second preset interface); N3 / N6 ports can realize traffic load sharing through interface bonding; N6 port can realize multi-client multi-DN (data network) mode through physical interface or sub-interface; server-network management switch; OAM (Operation, Administration, and Maintenance, i.e. operation management and maintenance interface), IPMI (Intelligent PlatformManagementInterface, i.e., intelligent platform management interface) (i.e., the first user plane function server and the management switch are connected through the third preset interface, and the second user plane function server and the management switch are connected through the fourth preset interface), network management switch-service switch: Outband VLAN intercommunication. For interface-related instructions, please refer to the following table. The interfaces are connected through Ethernet.

[0047]

[0048]

[0049] Step S204: after the session management function unit detects that the first user plane function server fails, the session information of the first user session carried by the first user plane function server is deleted, and the first user session is instructed to transmit data through the second user plane function server, wherein the first user session is a session within the service scope;

[0050] Optionally, under normal circumstances, SMF rotates the diverted user sessions to UPF-1 (first user plane function server) and UPF-2 (second user plane function server), and the user accesses the enterprise intranet through the corresponding diverted UPF;

[0051] After SMF detects the failure of the traffic diversion UPF-1, SMF deletes the user session (first user session) on UPF-1, and then inserts UPF-2 as ULCL (Uplink Classifier) ​​into the user session, and the user accesses the enterprise intranet through UPF-2. During the switching process, the user does not go offline, and there is no signaling impact on the surrounding network elements (such as PCF (Policy Control Function)).

[0052] Step S206: after detecting that the first user plane function server has recovered from the failure, when a second user session is received and the second user session specifies the first user plane function server as a traffic distribution anchor point, instruct the second user session to transmit data through the first user plane function server.

[0053] Optionally, when the offload UPF-1 failure is restored, the new user session (second user session) can select this UPF-1 as the offload anchor point. The second user session transmits data through the first user plane function server, and the online users will not be migrated to UPF1.

[0054] Optionally, the various parks within the service scope include first-type parks and second-type parks, wherein the user plane function network element is interconnected with each first-park user plane function network element in the first-type park through a dedicated line, wherein the user plane function network element is used to process the sessions of each first-park user plane function network element, and the first-park user plane network element is a subordinate node of the user plane function network element; the user plane function network element is interconnected with each second-park user plane function network element in the second-type park through a dedicated line, wherein the user plane function network element is used as a disaster recovery backup user plane function network element of the second-park user plane function network element.

[0055] Optionally, Figure 4 A disaster recovery topology diagram is shown, such as Figure 4As shown in the figure, the UPFx (user plane network element of the first park) of park A (type 1 park) is a subordinate node of the user plane function network element (UPF1), and the shared UPF1 (user plane function network element) of the city and prefecture is interconnected with all the UPFs (user plane network elements of the first park) of park A as a shared service. The shared UPF1 (user plane function network element) is used as the main control anchor point UPF, and is interconnected with the UPF (user plane function network element of the second park) of the park type B park (type 2 park) with a disaster recovery relationship as its backup machine (disaster recovery backup user plane function network element). The core network SMF network element point is used to detect the network connectivity of the main and backup nodes to realize the keep-alive mechanism. Among them, the user plane function network element is located in a different place from the type 2 park, so as to realize disaster recovery in different places. Park type A: Select the shared UPF of the city and prefecture, that is, the service traffic in the park is processed by the UPF at the city level. Park type B: Deploy the on-site UPF, that is, directly deploy the UPF in the park to reduce the transmission distance of the service traffic and improve efficiency. The green dotted line indicates the normal service flow of the park-based UPF, that is, the service traffic is processed in the park. The red dotted line indicates the service flow when the park-based UPF fails, that is, when the UPF in the park fails, the service traffic will be processed by the shared UPF1 (user plane function network element) at the municipal level.

[0056] Optionally, the service escape channel between the second park user plane functional network element and the user plane functional network element is composed of the second park user plane functional network element, the first network switching device in the disaster recovery backup system, the first router and the second router in the bearer network, the second network switching device in the disaster recovery backup system and the user plane functional network element connected in sequence.

[0057] Optionally, the linkage disaster recovery of the core + bearer specifically includes: the main UPF (second campus user plane function network element) is combined with the upstream bearer network B device, and the tunnel of the main UPF-network switching device 1 (first network switching device)-B1 (first route)-B2 (second route)-network switching device 2 (second network switching device)-UPF1 (user plane function network element) is opened through VPN based on GRE as a service escape channel, and SMF sets the service route priority overhead value to give priority to ensuring that the service accesses the service from the UPF on the side with a higher level. The service escape channel is a network design strategy used to ensure service continuity and uninterrupted data transmission when the main network path or equipment fails. Through VPN (virtual private network) and GRE (generic routing encapsulation) technology, a backup communication tunnel can be established. When there is a problem with the main communication link, the service traffic can be switched to this escape channel.

[0058] Among them, the detection mechanism and recovery principle specifically include: detecting the UPF keep-alive mechanism through the N4 interface through the core network SMF network element. When the main UPF detects that it is unavailable, the traffic is automatically switched to the shared UPF (UPF1) through the GRE tunnel. After the faulty main UPF is restored, the traffic is automatically switched to the main UPF, and the service is seamlessly migrated online without being affected.

[0059] Optionally, the capacity of the user plane function network element in the disaster recovery backup system includes basic capacity and disaster recovery capacity, wherein the basic capacity is equal to the sum of the capacities of each first park user plane function network element in the first type park, and the disaster recovery capacity is equal to the maximum value of the capacities of each second park user plane function network element in the second type park.

[0060] Optionally, each campus uses a dedicated DNN (Data Network Name). In the above deployment mode, the capacity of the user plane functional network element is determined including:

[0061] 1) The capacity of the centralized shared UPF (user plane function network element) in the prefecture-level city is divided into the sum of the basic capacity and the disaster recovery capacity. The basic capacity is the sum of the capacities of the user plane function network elements of each first park in the first type of park, and the disaster recovery capacity is the sum of the capacities of the user plane function network elements of each second park in the second type of park. If there are multiple first type of parks, the basic capacity is the sum of the capacities of the user plane function network elements of each first park in each first type of park. If there are multiple second type of parks, the disaster recovery capacity is the maximum value of the sum of the capacities of the user plane function network elements of each second park in the second type of park.

[0062] 2) The basic capacity of the shared UPF in cities and prefectures cannot be 0. There must be business traffic at ordinary times to ensure that the equipment and network environment are normal;

[0063] 3) The basic capacity and disaster recovery capacity are separated and isolated, and are planned uniformly on the shared UPF (user plane function network element) of the city; when the capacity of the shared UPF of the city is insufficient, it is necessary to expand the capacity in pairs. Among them, the shared UPF (user plane function network element) of the city is set as a group of two, such as Figure 4 UPF1 and UPF2 are grouped together. The disaster recovery backup system includes two user plane functional network elements. When expanding capacity, the two cities share UPF and expand capacity synchronously.

[0064] Optionally, the disaster recovery backup method also includes: determining a set of preset park numbers corresponding to the disaster recovery backup system, wherein the set of preset park numbers includes multiple alternative preset park numbers, and the preset park number is the number of parks that share a set of disaster recovery backup system; determining the fault conflict probability corresponding to each preset park number, wherein the fault conflict probability is the probability that at least two parks among the multiple parks corresponding to the same disaster recovery backup system fail at the same time, and the fault conflict probability is used to determine the target park number from the set of preset park numbers.

[0065] Optionally, a convergence ratio analysis is performed on the number of disaster recovery sets of the centralized shared UPF, specifically including:

[0066] 1) The availability of the centralized shared UPF is 99.9%, which means the average failure time is 530 minutes per year;

[0067] 2) According to the failure impact of UPF, the average failure duration needs to be mapped to the average number of failures per year;

[0068] 3) If the UPF fails once a year on average, the probability of a conflict between n sets of UPFs (n≤365) is:

[0069]

[0070] 4) If the UPF fails twice a year on average, then the probability of a conflict between n sets of UPFs (n≤182) is:

[0071]

[0072] 5) If the UPF fails 3 times per year on average, then the probability of a conflict between n sets of UPF failures (n≤121) is:

[0073]

[0074] The following table shows the failure conflict probabilities corresponding to multiple candidate preset campus numbers in the preset campus number set:

[0075]

[0076] Based on the convergence ratio analysis, the recommended value of the convergence ratio N is 8. The recommended value setting method of the convergence ratio N is analyzed as follows:

[0077] 1) From the above table, it can be seen that if the UPF fails once a year on average, the probability of a conflict occurring when 23 sets of shared UPF disaster recovery are deployed in the UPF is more than half; if the annual average failure rate is 2, the probability of a conflict occurring when 17 sets of disaster recovery are deployed is more than half; if the annual average failure rate is 3, the probability of a conflict occurring when 14 sets of disaster recovery are deployed is more than half.

[0078] 2) After comprehensive consideration, the recommended convergence ratio N=8, that is, one disaster recovery resource is reserved for every 8 campuses on the shared UPF (user plane function network element) to achieve a balance between resource utilization and reliability.

[0079] Shared UPF2 can also serve as a centralized shared UPF node for other parks based on the same deployment mode as shared UPF1, and the implementation method is the same as that of shared UPF1.

[0080] Under the above deployment mode, the business disaster recovery data flow is analyzed, such as Figure 4 As shown:

[0081] The shared UPF of cities and prefectures is used as the dedicated service flow of the service anchor point of type A campus. The shared UPF of cities and prefectures also serves as the disaster recovery UPF of type B campus:

[0082] 1. The services of Park 1 and Park 2 are shared through shared UPF1 and UPF2. Park 1 and Park 2 are non-enterprise parks that directly use shared UPF to process services. Type A park: select prefecture-level shared UPF, that is, the service traffic in the park is processed by the UPF at the prefecture-level. Type B park: deploy on-site UPF, that is, directly deploy UPF in the park to reduce the transmission distance of service traffic and improve efficiency:

[0083] 1) When shared UPF1 fails, services in Park 1 and Park 2 will be routed through shared UPF2;

[0084] 2) When shared UPF2 fails, services in Park 1 and Park 2 will be routed through shared UPF1;

[0085] 2. Share UPF1 as the disaster recovery UPF of Campus A UPFx; UPF1 and Campus A UPFx establish a GRE tunnel:

[0086] 1) When the traffic in Campus A is normal, it is forwarded through the UPFx in Campus A;

[0087] 2) When UPFx of Campus A fails, Campus A forwards data through the shared UPF1;

[0088] 3) When UPFx in Campus A fails, the traffic in Campus A is forwarded through the shared UPF1;

[0089] 4) When the UPFx fault in campus A is restored, the online existing user traffic is forwarded from UPF1 to UPFx through the GRE tunnel.

[0090] 3. Share UPF2 as the disaster recovery UPF of campus B UPFy; UPF2 and campus B UPFy establish a GRE tunnel:

[0091] 1) When the traffic of campus B is normal, it is forwarded through campus B UPFy;

[0092] 2) When UPFy of campus B fails, campus B forwards data through the shared UPF2;

[0093] 3) When UPFy in campus B fails, the traffic in campus B is forwarded through the shared UPF2;

[0094] 4) When the failure of UPFy in campus B is restored, the online existing user traffic is forwarded from UPF2 to UPFy through the GRE tunnel.

[0095] Optionally, Figure 5 A schematic diagram of a GRE tunnel is shown, such as Figure 5 As shown, the user equipment (UE) is connected to the network through the radio access network (CDMA-RAN), which is responsible for sending and receiving wireless signals. The UE communicates with the access point node (APN) through the N3 interface. The APN is the access point node of the network and is responsible for processing traffic from the UE.

[0096] APN is connected to User Plane Function (UPF) 01 and 02 through CDMA-N6.Local interface. CDMA-EPC (CDMA Evolved Packet Core), as part of the core network, is connected to UPF through B / CE / PE (Base Station Controller / Core Network Element / Packet Data Network Gateway) to realize data routing and forwarding. UPF is a key component in 5G network, responsible for forwarding and processing data packets.

[0097] The figure also shows two tunnel interfaces, tunnel1 and loopback51, which are used to establish GRE tunnels between UPFs. GRE tunnels allow data packets to be transmitted between different network segments while maintaining the integrity and security of the data packets. Between UPF01 and UPF02, efficient data transmission is achieved through GRE tunnels, which transmit data through internal VPN (Virtual Private Network) CDMA-N6.Local (CDMA-N6 Local) and shared VPN (Virtual Private Network) CDMA-EPC (CDMA Evolved Packet Core).

[0098] Through the above steps, the centralized shared UPF mode can achieve uninterrupted transmission of cross-network element-level and DC-level service sessions, thereby improving network robustness and UPF utilization. Deploy centralized shared UPF as a service anchor point in cities and prefectures, and interconnect with the disaster recovery UPF dedicated line in the park. Based on GRE tunnel and SMF network element point detection, a keep-alive mechanism is implemented, as well as automatic one-click switching to the remote UPF to quickly migrate services to the backup machine. The centralized shared UPF can not only undertake basic services, but also establish shared disaster recovery with the park UPF, which solves the hidden dangers brought by the single-point deployment of UPF, and also improves the utilization rate of UPF, achieving cost reduction and efficiency improvement. Compared with the traditional single data center, while utilizing the high availability of two UPFs, in terms of security, it not only realizes cross-DC-level disaster recovery, but also realizes hierarchical disaster recovery from cities to parks, and provides a calculation method for N that can share disaster recovery to calculate the number of first-level disaster recovery nodes that can be undertaken. The method embodiments of the present application can be extended to the following scenarios: 5G UPF cross-level disaster recovery from province to city; applying shared UPF to application scenarios with multiple sub-nodes such as industrial ports and educational campuses; scenarios based on on-site UPF as the main node to share disaster recovery with other branch UPF nodes; UPF with low utilization (it is recommended that computing power resource utilization rate be less than 10%) as a shared disaster recovery node. For 5G services, a single device is provided under the premise of considering customer cost savings, and UPF is shared with the city level for disaster recovery to ensure customer business continuity and achieve high reliability. The method embodiments of the present application promote the development of the product idea of ​​transforming a blade UPF server into a set of two UPFs for disaster recovery, and propose a new cross-level disaster recovery solution to meet the needs of high-reliability disaster recovery, which is of significance for national promotion. The method embodiments of the present application extend the cross-DC cross-level solution to realize the primary and standby UPF disaster recovery deployment method. The method embodiments provided by the present application have the following advantages:

[0099] 1. Centralized shared UPF deployment module: A centralized shared UPF is deployed at the municipal level as a business anchor point, while also assuming the role of a disaster recovery UPF for the park.

[0100] 2. Load sharing module: realizes UPF load sharing, forms a service pool by diverting UPF1 / 2, and connects with the enterprise intranet. The disaster recovery implementation process is: when SMF detects UPF failure, it automatically switches the user session to the backup UPF to ensure business continuity.

[0101] 3. Cross-level disaster recovery module: For the UPF of a single data center, cross-DC disaster recovery is achieved, which improves the robustness of the network and the utilization rate of UPF. Through the shared UPF and the park UPF with disaster recovery relationship, a tunnel is established based on GRE, and the SMF network element point detection is used to implement the keep-alive mechanism.

[0102] 4. Multi-level disaster recovery: From NE-level disaster recovery to network-level disaster recovery, on the basis of NE disaster recovery, the remote disaster recovery of the network is further realized, which ensures the stability of the 5G customized network at a higher level.

[0103] 5. One-key switching module: Through the SMF network element detection UPF keep-alive mechanism, when the main UPF is not connected, the traffic is automatically switched to the other side through the GRE tunnel. Automatically block the faulty UPF network with one click, switch to the remote UPF synchronously, quickly migrate the service to the backup machine, and maximize the guarantee of uninterrupted service.

[0104] 6. Dedicated DNN module: Each park uses a dedicated DNN to distinguish different business flows. The capacity of the centralized shared UPF in cities is separated into basic capacity and disaster recovery capacity, and planned in a unified manner.

[0105] 7. Convergence ratio analysis module: Analyze the availability and failure impact of centralized shared UPF to determine the optimal resource utilization and reliability balance point.

[0106] The present application provides a disaster recovery backup device. Figure 6 is a schematic diagram of the structure of the device, such as Figure 6 As shown, the device includes: a first processing module 60, which is used to configure the service range of the first user plane function server and the second user plane function server of the user plane function network element according to preset configuration information, wherein the preset configuration information includes the tracking area code of the preset park, and the user plane function network element is used as a disaster recovery backup user plane function network element of each park within the service range, and is used to process sessions in each park; a second processing module 62, which is used to delete the session information of the first user session carried by the first user plane function server after the session management function unit detects a failure of the first user plane function server, and instruct the first user session to transmit data through the second user plane function server, wherein the first user session is a session within the service range; a third processing module 64, which is used to instruct the second user session to transmit data through the first user plane function server after detecting that the first user plane function server has recovered from the failure, when the second user session is received and the first user plane function server is specified as the diversion anchor point in the second user session.

[0107] In some embodiments of the present application, the disaster recovery backup system also includes a first service switch, a second service switch and a management switch, wherein the first user plane function server and the second user plane function server are connected through a heartbeat interface; the first user plane function server and the first service switch are connected through a first preset interface, and the second user plane function server and the second service switch are connected through a second preset interface, wherein the interface types of the first preset interface include: N3 interface, N6 interface, N4 interface and N9 interface, and the types of the second preset interface include: N3 interface, N6 interface, N4 interface and N9 interface; the first user plane function server and the management switch are connected through a third preset interface, and the second user plane function server and the management switch are connected through a fourth preset interface, wherein the interface types of the third preset interface include an intelligent platform management interface and an operation management and maintenance interface, and the interface types of the fourth preset interface include an intelligent platform management interface and an operation management and maintenance interface.

[0108] In some embodiments of the present application, the disaster recovery backup system also includes multiple bearer network devices, wherein the bearer network devices and the first service switch and the second service switch are connected via Ethernet; the first service switch, the second service switch and the management switch are all connected via Ethernet; and the first service switch and the second service switch are connected via Ethernet.

[0109] In some embodiments of the present application, each park within the service scope includes a first-type park and a second-type park, wherein the user plane function network element is interconnected with each first-park user plane function network element in the first-type park through a dedicated line, wherein the user plane function network element is used to process sessions of each first-park user plane function network element, and the first-park user plane network element is a subordinate node of the user plane function network element; the user plane function network element is interconnected with each second-park user plane function network element in the second-type park through a dedicated line, wherein the user plane function network element is used as a disaster recovery backup user plane function network element of the second-park user plane function network element.

[0110] In some embodiments of the present application, the service escape channel between the second park user plane functional network element and the user plane functional network element is composed of the second park user plane functional network element, the first network switching device in the disaster recovery backup system, the first router and the second router in the bearer network, the second network switching device in the disaster recovery backup system and the user plane functional network element connected in sequence.

[0111] In some embodiments of the present application, the capacity of the user plane functional network element in the disaster recovery backup system includes basic capacity and disaster recovery capacity, wherein the basic capacity is equal to the sum of the capacities of each first park user plane functional network element in the first type of park, and the disaster recovery capacity is equal to the sum of the capacities of each second park user plane functional network element in the second type of park.

[0112] In some embodiments of the present application, the disaster recovery backup method also includes: determining a set of preset park numbers corresponding to the disaster recovery backup system, wherein the set of preset park numbers includes multiple alternative preset park numbers, and the preset park number is the number of parks that share a set of disaster recovery backup system; determining the fault conflict probability corresponding to each preset park number, wherein the fault conflict probability is the probability that at least two parks among the multiple parks corresponding to the same disaster recovery backup system fail at the same time, and the fault conflict probability is used to determine the target park number from the set of preset park numbers.

[0113] It should be noted that the various modules in the above-mentioned disaster recovery backup device can be program modules (for example, a set of program instructions that implement a certain specific function) or hardware modules. For the latter, it can be expressed in the following forms, but is not limited to this: the expression form of each of the above-mentioned modules is a processor, or the functions of each of the above-mentioned modules are implemented by a processor.

[0114] The embodiment of the present application provides a non-volatile storage medium, in which a program is stored, wherein when the program is running, a device where the non-volatile storage medium is located is controlled to perform the following disaster recovery backup method: a session management function unit in the disaster recovery backup system configures the service range of a first user plane function server and a second user plane function server of a user plane function network element according to preset configuration information, wherein the user plane function network element is arranged in the disaster recovery backup system, the preset configuration information includes a tracking area code of a preset park, and the user plane function network element is used to serve as a disaster recovery backup user plane function network element of each park within the service range, and is used to process sessions within each park; after the session management function unit detects a failure of the first user plane function server, the session information of the first user session carried by the first user plane function server is deleted, and the first user session is instructed to transmit data through the second user plane function server, wherein the first user session is a session within the service range; after detecting that the failure of the first user plane function server is recovered, when a second user session is received and the first user plane function server is specified as a diversion anchor point in the second user session, the second user session is instructed to transmit data through the first user plane function server.

[0115] An embodiment of the present application provides an electronic device, including: a memory and a processor, the processor is used to run a program stored in the memory, wherein the following disaster recovery backup method is performed when the program is run: a session management function unit in the disaster recovery backup system configures the service range of a first user plane function server and a second user plane function server of a user plane function network element according to preset configuration information, wherein the user plane function network element is arranged in the disaster recovery backup system, the preset configuration information includes a tracking area code of a preset park, the user plane function network element is used to serve as a disaster recovery backup user plane function network element of each park within the service range, and is used to process sessions within each park; after the session management function unit detects a failure of the first user plane function server, the session information of the first user session carried by the first user plane function server is deleted, and the first user session is instructed to transmit data through the second user plane function server, wherein the first user session is a session within the service range; after detecting that the failure of the first user plane function server is recovered, when a second user session is received and the first user plane function server is specified as a diversion anchor point in the second user session, the second user session is instructed to transmit data through the first user plane function server.

[0116] An embodiment of the present application provides a computer program product, including a computer program, which implements the following disaster recovery backup method when executed by a processor: a session management function unit in a disaster recovery backup system configures a service range of a first user plane function server and a second user plane function server of a user plane function network element according to preset configuration information, wherein the user plane function network element is arranged in the disaster recovery backup system, the preset configuration information includes a tracking area code of a preset park, and the user plane function network element is used to serve as a disaster recovery backup user plane function network element of each park within the service range, and is used to process sessions within each park; after the session management function unit detects a failure of the first user plane function server, the session information of the first user session carried by the first user plane function server is deleted, and the first user session is instructed to transmit data through the second user plane function server, wherein the first user session is a session within the service range; after detecting that the failure of the first user plane function server is recovered, when a second user session is received and the first user plane function server is specified as a diversion anchor point in the second user session, the second user session is instructed to transmit data through the first user plane function server.

[0117] In the above embodiments of the present application, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0118] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0119] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0120] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0121] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the relevant technology or all or part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, disk or optical disk, etc. Various media that can store program codes.

[0122] The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A disaster recovery backup method, characterized in that: include: The session management function unit in the disaster recovery backup system configures the service range of the first user plane function server and the second user plane function server of the user plane function network element according to the preset configuration information, wherein the user plane function network element is arranged in the disaster recovery backup system, the preset configuration information includes the tracking area code of the preset park, and the user plane function network element is used as a disaster recovery backup user plane function network element of each park within the service range, and is used to process the sessions in each park; After the session management function unit detects a failure of the first user plane function server, deletes session information of a first user session carried by the first user plane function server, and instructs the first user session to transmit data through the second user plane function server, wherein the first user session is a session within the service scope; After detecting that the first user plane function server has recovered from a failure, when a second user session is received and the first user plane function server is specified as a traffic diversion anchor point in the second user session, the second user session is instructed to transmit data through the first user plane function server.

2. The disaster recovery backup method according to claim 1, characterized in that: The disaster recovery backup system also includes a first service switch, a second service switch and a management switch, wherein: The first user plane function server and the second user plane function server are connected via a heartbeat interface; The first user plane function server and the first service switch are connected through a first preset interface, and the second user plane function server and the second service switch are connected through a second preset interface, wherein the interface types of the first preset interface include: N3 interface, N6 interface, N4 interface and N9 interface, and the types of the second preset interface include: N3 interface, N6 interface, N4 interface and N9 interface; The first user plane function server and the management switch are connected via a third preset interface, and the second user plane function server and the management switch are connected via a fourth preset interface, wherein the interface types of the third preset interface include an intelligent platform management interface and an operation management and maintenance interface, and the interface types of the fourth preset interface include an intelligent platform management interface and an operation management and maintenance interface.

3. The disaster recovery backup method according to claim 2, characterized in that: The disaster recovery backup system also includes multiple bearer network devices, wherein: The bearer network device and the first service switch and the second service switch are connected via Ethernet; The first service switch, the second service switch and the management switch are all connected via Ethernet; The first service switch and the second service switch are connected via Ethernet.

4. The disaster recovery backup method according to claim 1, characterized in that: The parks within the service scope include first-class parks and second-class parks, among which: The user plane function network element is interconnected with each first park user plane function network element in the first type park through a dedicated line, wherein the user plane function network element is used to process the sessions of each first park user plane function network element, and the first park user plane network element is a subordinate node of the user plane function network element; The user plane function network element is interconnected with each second park user plane function network element in the second type park through a dedicated line, wherein the user plane function network element is used as a disaster recovery backup user plane function network element of the second park user plane function network element.

5. The disaster recovery backup method according to claim 4, characterized in that: The service escape channel between the second campus user plane function network element and the user plane function network element is composed of the second campus user plane function network element, the first network switching device in the disaster recovery backup system, the first router and the second router in the bearer network, the second network switching device in the disaster recovery backup system and the user plane function network element connected in sequence.

6. The disaster recovery backup method according to claim 4, characterized in that: The capacity of the user plane function network element in the disaster recovery backup system includes basic capacity and disaster recovery capacity, wherein the basic capacity is equal to the sum of the capacities of each of the first park user plane function network elements in the first type of park, and the disaster recovery capacity is equal to the sum of the capacities of each of the second park user plane function network elements in the second type of park.

7. The disaster recovery backup method according to claim 1, characterized in that: The disaster recovery backup method further includes: Determine a preset park quantity set corresponding to the disaster recovery backup system, wherein the preset park quantity set includes a plurality of candidate preset park quantities, and the preset park quantity is the number of parks that share a set of the disaster recovery backup system; Determine the fault conflict probability corresponding to each of the preset park numbers, wherein the fault conflict probability is the probability that at least two parks among the multiple parks corresponding to the same disaster recovery backup system fail at the same time, and the fault conflict probability is used to determine the target park number from the preset park number set.

8. A disaster recovery backup device, suitable for use in a session management function unit of a disaster recovery backup system, characterized in that: include: A first processing module, configured to configure the service range of a first user plane function server and a second user plane function server of a user plane function network element according to preset configuration information, wherein the preset configuration information includes a tracking area code of a preset park, and the user plane function network element is used as a disaster recovery backup user plane function network element of each park within the service range, and is used to process sessions in each park; a second processing module, configured to, after the session management function unit detects a failure of the first user plane function server, delete session information of a first user session carried by the first user plane function server, and instruct the first user session to transmit data through the second user plane function server, wherein the first user session is a session within the service scope; The third processing module is configured to, after detecting that the first user plane function server has recovered from a failure, instruct the second user session to transmit data through the first user plane function server when a second user session is received and the first user plane function server is specified as a diversion anchor point in the second user session.

9. A non-volatile storage medium, characterized in that: The non-volatile storage medium stores a program, wherein when the program is running, the device where the non-volatile storage medium is located is controlled to execute the disaster recovery backup method according to any one of claims 1 to 7.

10. An electronic device, characterized in that: include: A memory and a processor, wherein the processor is used to run a program stored in the memory, wherein the disaster recovery backup method according to any one of claims 1 to 7 is executed when the program is run.

11. A computer program product, characterized in that It comprises a computer program, which implements the disaster recovery backup method according to any one of claims 1 to 7 when executed by a processor.

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