CN114006884B - Session control method, device and system in network address translation scene - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04L61/00—Network arrangements, protocols or services for addressing or naming
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- H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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Abstract
The disclosure provides a session control method, a device and a system in a network address translation scene, and relates to the field of communication. The NEF network element receives a first session control policy change request based on a user identity and sent by an AF network element, wherein the first session control policy change request comprises the user identity and the session identity; inquiring BSF network elements where user session binding relations are located from a user subscription database based on the user identity and the session identity; inquiring the user IP address and PCF address from the BSF network element based on the user identity and the session identity; converting the first session control policy change request into a second session control policy change request based on the user IP address, and sending the second session control policy change request to the corresponding PCF network element; and receiving an execution result of the second session control policy change request returned by the PCF network element and sending the execution result to the AF network element. Therefore, the problem that the AF network element cannot control the user session in real time due to the fact that the user fails to report the real IP address in the network address conversion scene is solved, and the flexibility and the robustness of the user session control are enhanced.
Description
Technical Field
The present disclosure relates to the field of communications, and in particular, to a method, an apparatus, and a system for session control in a network address translation scenario.
Background
In most mobile networks, due to the lack of IPV4 addresses, the user addresses mostly use private network addresses, which need to be translated into public network addresses by NAT (Network Address Translation ) when the user establishes a connection with the outside. Therefore, in the NAT environment, if the user does not report its real IP address to the AF (Application function ) network element, the AF network element obtains the NAT-translated IP address instead of the user real IP address, so that the AF network element cannot control the user session control policy based on the IP address in real time, resulting in a lack of flexibility and robustness in session control.
Disclosure of Invention
The embodiment of the disclosure provides a session control scheme in a network address conversion scene, solves the problem that an AF network element cannot control a user session in real time due to the fact that a user fails to report a real IP address in the network address conversion scene, and enhances the flexibility and robustness of user session control.
Some embodiments of the present disclosure provide a session control method in a network address translation scenario, including:
the NEF network element receives a first session control policy change request based on a user identity sent by the AF network element, wherein the first session control policy change request comprises the user identity and the session identity;
the NEF network element inquires a BSF network element where a user session binding relation is located from a user subscription database based on the user identity and the session identity, and registration information recorded by the user subscription database comprises the user identity, the session identity and a BSF network element address;
the NEF network element inquires a user IP address and a PCF address from a BSF network element where a user session binding relationship is located based on a user identity and a session identity, wherein the user session binding relationship recorded by the BSF network element comprises the user identity, the session identity, the user IP address and the PCF address;
the NEF network element converts the first session control policy change request based on the user identity into a second session control policy change request based on the user IP address, and sends the second session control policy change request to the corresponding PCF network element, wherein the second session control policy change request comprises the user IP address and the session identity;
the NEF network element receives an execution result of the second session control policy change request returned by the PCF network element, and sends the execution result of the second session control policy change request to the AF network element.
In some embodiments, the BSF network element obtains user session related information from the SMF network element and establishes a user session binding relationship between the user session related information, where the user session related information and the user session binding relationship include: user identity, session identity, user IP address and PCF address.
In some embodiments, after establishing the user session binding relationship, the BSF network element registers with the user subscription database, and the provided registration information includes a user identity, a session identity, and a BSF network element address.
In some embodiments, the BSF network element logs off the registration information before the user subscription database after the user session is ended.
In some embodiments, the NEF network element sends the execution result of the second session control policy change request and the user IP address to the AF network element together, so that the AF network element obtains the user IP address; when the AF network element sends a first session control strategy changing request based on the user identity, only the IP address of the user after the IP address of the user is converted by the network address is obtained.
In some embodiments, after the AF network element obtains the user IP address, in the session duration process, the NEF network element receives a third session control policy change request based on the user IP address sent by the AF network element, and forwards the third session control policy change request to the PCF network element to change the session control policy, where the third session control policy change request includes the user IP address and the session identifier.
Some embodiments of the present disclosure provide a session control device in a network address translation scenario, including: a memory; and a processor coupled to the memory, the processor configured to perform the session control method in the network address translation context of the various embodiments based on instructions stored in the memory.
Some embodiments of the present disclosure provide a session control system in a network address translation scenario, including: a NEF network element configured to perform a session control method performed by the NEF network element.
In some embodiments, further comprising: the BSF network element is configured to acquire user session related information from the SMF network element, and establish a user session binding relationship between the user session related information, where the user session related information and the user session binding relationship include: user identity, session identity, user IP address and PCF address; responding to the inquiry of the NEF network element, inquiring the user session binding relation based on the user identity and the session identity, and returning the corresponding user IP address and PCF address to the NEF network element.
In some embodiments, the BSF network element is further configured to register with a subscriber subscription database after establishing the subscriber session binding relationship, the provided registration information including a subscriber identity, a session identity, a BSF network element address; or after the user session is ended, registering information before logging out to the user subscription database.
In some embodiments, further comprising: the user subscription database is configured to record registration information of the BSF network element, including user identity, session identity and BSF network element address; responding to the inquiry of the NEF network element, inquiring the registration information based on the user identity and the session identity, and returning a corresponding BSF network element address to the NEF network element.
Some embodiments of the present disclosure propose a non-transitory computer readable storage medium, on which a computer program is stored, which when executed by a processor implements the steps of the session control method in the network address translation scenario of the respective embodiments.
Drawings
The drawings that are required for use in the description of the embodiments or the related art will be briefly described below. The present disclosure will be more clearly understood from the following detailed description with reference to the accompanying drawings.
It will be apparent to those of ordinary skill in the art that the drawings in the following description are merely examples of the disclosure and that other drawings may be derived from them without inventive faculty.
Fig. 1 shows a schematic diagram of a session control system (simply "system") in a network address translation scenario of some embodiments of the present disclosure.
Fig. 2 illustrates a schematic diagram of a session control method in a network address translation scenario of some embodiments of the present disclosure.
Fig. 3 illustrates a schematic structure of a session control apparatus in a network address translation scenario according to some embodiments of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure.
Unless specifically stated otherwise, the descriptions of "first," "second," and the like in this disclosure are used for distinguishing between different objects and are not used for indicating a meaning of size or timing, etc.
Fig. 1 shows a schematic diagram of a session control system (simply "system") in a network address translation scenario of some embodiments of the present disclosure.
As shown in fig. 1, the system of this embodiment includes: the user subscription databases such as NEF (Network Exposure Function, network open function) network element, BSF (Binding Support Function ) network element, UDR (Universal Data Repository, universal data repository) or UDM (Unified Data Manager, unified data management platform) may further include SMF (Session Management Function ) network element, PCF (Policy Control Function, policy control function) network element, NRF (Network Repository Function, network storage function) network element, AF (Application function ) network element, NAT (Network Address Translation ) network element, and the like.
The embodiment of the disclosure provides a session control scheme under a network address conversion scene, which is mainly used for enhancing functions of a user subscription database, a BSF network element and a NEF network element, so that the problem that an AF network element cannot control a user session in real time due to the fact that a user fails to report a real IP address under the network address conversion scene is solved, and flexibility and robustness of user session control are enhanced.
1. Enhancements to user subscription databases (e.g., UDM/UDR) include:
supporting BSF network element registration and deregistration;
the supporting NEF network element inquires the BSF network element address of the user session binding relation through the user identification.
Specifically, the user subscription database is configured to respond to the registration of the BSF network element and record the registration information of the BSF network element, including the user identity, the session identity and the BSF network element address; responding to the inquiry of the NEF network element, inquiring registration information based on the user identity and the session identity, and returning a corresponding BSF network element address to the NEF network element; and deleting the registration information of the BSF network element in response to the cancellation of the BSF network element.
2. The enhancing of the BSF network element comprises the following steps:
support registration with a user subscription database (e.g., UDM/UDR) after establishing a user session binding relationship, and deregistration after session end;
indexing lookup of user session bindings based on user identification is supported.
Specifically, the BSF network element is configured to obtain user session related information from the SMF network element, and establish a user session binding relationship between the user session related information, where the user session related information and the user session binding relationship include: user identity, session identity, user IP address and PCF address; after establishing a user session binding relationship, registering with a user subscription database, wherein the provided registration information comprises a user identity, a session identifier and a BSF network element address; responding to the inquiry of the NEF network element, inquiring the user session binding relationship based on the user identity and the session identity, and returning corresponding user IP address and PCF address to the NEF network element; after the user session is finished, the registration information before the user sign-up database is logged out is recorded.
3. Enhancement of the NEF network element includes:
when receiving a session control policy change request based on user identification sent by an AF network element, inquiring a BSF network element address where a user session binding relation is located from a user subscription database (such as UDM/UDR);
supporting the conversion of a session control policy change request of an AF network element based on a user identifier into a session control policy change request based on a user IP address according to the user IP address returned by the BSF network element;
supporting to send a session control policy change request based on the user IP address to the PCF network element according to the user IP address returned by the BSF network element;
and when the execution result of the session control policy change request is returned to the AF network element, the AF network element is enabled to return the user IP address together, so that the AF network element obtains the user IP address.
Specifically, the NEF network element is configured to receive a first session control policy change request based on a user identity sent by the AF network element, wherein the first session control policy change request comprises the user identity and the session identity; inquiring a BSF network element where a user session binding relation is located from a user subscription database based on the user identity and the session identity, wherein the registration information recorded in the user subscription database comprises the user identity, the session identity and the BSF network element address; inquiring a user IP address and a PCF address from a BSF network element where a user session binding relationship is located based on the user identity and the session identity, wherein the user session binding relationship recorded by the BSF network element comprises the user identity, the session identity, the user IP address and the PCF address; converting the first session control policy change request based on the user identity into a second session control policy change request based on the user IP address, and sending the second session control policy change request to the corresponding PCF network element, wherein the second session control policy change request comprises the user IP address and the session identity; and receiving an execution result of the second session control policy change request returned by the PCF network element, and sending the execution result of the second session control policy change request to the AF network element. The NEF network element sends the execution result of the second session control strategy change request and the user IP address to the AF network element together, so that the AF network element obtains the user IP address; when the AF network element sends a first session control strategy changing request based on the user identity, only the IP address of the user after the IP address of the user is converted by the network address is obtained.
Specifically, the NEF network element is further configured to receive, in the session duration process, a third session control policy change request based on the user IP address sent by the AF network element after the AF network element obtains the user IP address, and forward the third session control policy change request to the PCF network element to change the session control policy, where the third session control policy change request includes the user IP address and the session identifier.
Fig. 2 illustrates a schematic diagram of a session control method in a network address translation scenario of some embodiments of the present disclosure.
As shown in fig. 2, the session control method in the network address translation scenario of this embodiment includes the following steps.
In step 210, a User Equipment (UE) accesses a network, initiates a communication request with an AF network element via a NAT network element, and establishes a session with the AF network element.
In step 220, the smf network element obtains the PCF network element and the BSF network element used for the current user session by querying the NRF network element, and establishes a policy association for the current session control with the PCF network element.
In step 230, the bsf network element obtains user session related information from the SMF network element, and establishes a user session binding relationship between the user session related information, where the user session related information and the user session binding relationship include: user identity, session identity, user IP address and PCF address.
The BSF network element may also obtain user session related information from the PCF network element.
After establishing the user session binding relationship, the BSF network element registers with a user subscription database (e.g., UDM/UDR) in step 240, and the provided registration information includes a user identity, a session identity, and a BSF network element address.
In step 250, since the UE does not report its IP address, only the IP address after NAT conversion is in the AF network element database, and therefore, in the session process, the AF network element initiates a session control policy change based on the user identity, and the AF network element sends a first session control policy change request based on the user identity to the NEF network element, where the first session control policy change request includes the user identity and the session identity.
User identities include, but are not limited to, SUPI (SUbscription Permanent Identifier, user permanent identifier), GPSI (Generic Public Subscription Identifier, general public user identity), and the like, which can be used to identify a user identity.
In step 260, the nef network element receives a first session control policy change request based on the user identity sent by the AF network element, where the first session control policy change request includes the user identity and the session identity. The NEF network element inquires a BSF network element where a user session binding relation is located from a user subscription database based on the user identity and the session identity, and registration information recorded by the user subscription database comprises the user identity, the session identity and the BSF network element address. The user subscription database responds to the inquiry of the NEF network element, inquires the registration information based on the user identity and the session identity, and returns the corresponding BSF network element address to the NEF network element.
In step 270, the nef network element queries the BSF network element where the user session binding relationship is located for the user IP address and the PCF address based on the user identity and the session identity, where the user session binding relationship recorded by the BSF network element includes the user identity, the session identity, the user IP address and the PCF address; the BSF network element responds to the inquiry of the NEF network element, inquires the user session binding relation based on the user identity and the session identity, and returns the corresponding user IP address and PCF address to the NEF network element.
In step 280, the nef network element converts the first session control policy change request based on the user identity into a second session control policy change request based on the user IP address, and sends the second session control policy change request to the corresponding PCF network element, where the second session control policy change request includes the user IP address and the session identity; the PCF network element executes the second session control policy change request and returns an execution result to the NEF network element.
In step 290, the nef network element receives the execution result of the second session control policy change request returned by the PCF network element, and sends the execution result of the second session control policy change request to the AF network element.
Therefore, the change of the session control strategy when the AF network element does not report the IP address under the NAT scene is realized.
The NEF network element may also send the execution result of the second session control policy change request to the AF network element together with the user IP address, so that the AF network element obtains the user IP address. In the session duration process, the subsequent session control policy is changed, and the AF can directly control the session control policy in real time through the NEF network element by using the user IP address. That is, after the AF network element obtains the user IP address, in the session continuation process, the AF network element sends a third session control policy change request based on the user IP address to the NEF network element, and the NEF network element receives the third session control policy change request based on the user IP address sent by the AF network element, and forwards the third session control policy change request to the PCF network element to change the session control policy, where the third session control policy change request includes the user IP address and the session identifier.
In step 2100, the bsf network element logs out the registration information before the user subscription database after the user session is ended.
The embodiment realizes a session control scheme under the network address conversion scene, solves the problem that the AF network element cannot control the user session in real time due to the fact that the user fails to report the real IP address under the network address conversion scene, and enhances the flexibility and robustness of the user session control.
Fig. 3 illustrates a schematic structure of a session control apparatus in a network address translation scenario according to some embodiments of the present disclosure. The device may be arranged in a subscriber subscription database, a BSF network element, a NEF network element, for example, and execute the session control method executed by the subscriber subscription database, the BSF network element, the NEF network element.
As shown in fig. 3, the apparatus 300 of this embodiment includes: a memory 310 and a processor 320 coupled to the memory 310, the processor 320 being configured to perform the session control method in the context of network address translation in any of the embodiments described above based on instructions stored in the memory 310.
The memory 310 may include, for example, system memory, fixed nonvolatile storage media, and the like. The system memory stores, for example, an operating system, application programs, boot Loader (Boot Loader), and other programs.
Processor 320 may be implemented as discrete hardware components such as 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 device, discrete gates, or transistors.
The apparatus 300 may also include an input-output interface 330, a network interface 340, a storage interface 350, and the like. These interfaces 330, 340, 350 and the memory 310 and the processor 320 may be connected, for example, by a bus 360. The input/output interface 330 provides a connection interface for input/output devices such as a display, a mouse, a keyboard, a touch screen, and the like. Network interface 340 provides a connection interface for various networking devices. Storage interface 350 provides a connection interface for external storage devices such as SD cards, U-discs, and the like. Bus 360 can employ any of a variety of bus architectures. For example, bus structures include, but are not limited to, an Industry Standard Architecture (ISA) bus, a Micro Channel Architecture (MCA) bus, and a Peripheral Component Interconnect (PCI) bus.
Some embodiments of the present disclosure propose a non-transitory computer readable storage medium, on which a computer program is stored, which when executed by a processor implements the steps of a session control method in a network address translation scenario.
It will be appreciated by those skilled in the art that embodiments of the present disclosure may be provided as a method, system, or computer program product. Accordingly, the present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present disclosure may take the form of a computer program product embodied on one or more non-transitory computer-readable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer program code embodied therein.
The present disclosure is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the disclosure. It will be understood that each flowchart and/or block of the flowchart illustrations and/or block diagrams, and combinations of flowcharts and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The foregoing description of the preferred embodiments of the present disclosure is not intended to limit the disclosure, but rather to enable any modification, equivalent replacement, improvement or the like, which fall within the spirit and principles of the present disclosure.
Claims (12)
1. A session control method in a network address translation scenario, comprising:
the NEF network element receives a first session control policy change request based on a user identity sent by the AF network element, wherein the first session control policy change request comprises the user identity and the session identity;
the NEF network element inquires a BSF network element where a user session binding relation is located from a user subscription database based on the user identity and the session identity, and registration information recorded by the user subscription database comprises the user identity, the session identity and a BSF network element address;
the NEF network element inquires a user IP address and a PCF address from a BSF network element where a user session binding relationship is located based on a user identity and a session identity, wherein the user session binding relationship recorded by the BSF network element comprises the user identity, the session identity, the user IP address and the PCF address;
the NEF network element converts the first session control policy change request based on the user identity into a second session control policy change request based on the user IP address, and sends the second session control policy change request to the corresponding PCF network element, wherein the second session control policy change request comprises the user IP address and the session identity;
the NEF network element receives an execution result of the second session control policy change request returned by the PCF network element, and sends the execution result of the second session control policy change request to the AF network element.
2. The method of claim 1, wherein the step of determining the position of the substrate comprises,
the BSF network element obtains user session related information from the SMF network element and establishes a user session binding relationship between the user session related information, wherein the user session related information and the user session binding relationship comprise: user identity, session identity, user IP address and PCF address.
3. The method of claim 2, wherein the step of determining the position of the substrate comprises,
after establishing the user session binding relation, the BSF network element registers with the user subscription database, and the provided registration information comprises user identity, session identity and BSF network element address.
4. The method of claim 3, wherein the step of,
after the user session is ended, the BSF network element logs out the registration information before the user subscription database.
5. The method of claim 1, wherein the step of determining the position of the substrate comprises,
the NEF network element sends the execution result of the second session control strategy change request and the user IP address to the AF network element together, so that the AF network element obtains the user IP address;
when the AF network element sends a first session control strategy changing request based on the user identity, only the IP address of the user after the IP address of the user is converted by the network address is obtained.
6. The method of claim 5, wherein the step of determining the position of the probe is performed,
after the AF network element obtains the user IP address, in the session duration process, the NEF network element receives a third session control strategy changing request based on the user IP address, which is sent by the AF network element, and forwards the third session control strategy changing request to the PCF network element for changing the session control strategy, wherein the third session control strategy changing request comprises the user IP address and the session identifier.
7. A session control apparatus in a network address translation scenario, comprising:
a memory; and
a processor coupled to the memory, the processor configured to perform the session control method in the network address translation scenario of any one of claims 1-6 based on instructions stored in the memory.
8. A session control system in a network address translation scenario, comprising: a NEF network element configured to perform the method of claim 1, 5 or 6.
9. The system of claim 8, further comprising:
the BSF network element is configured to acquire user session related information from the SMF network element, and establish a user session binding relationship between the user session related information, where the user session related information and the user session binding relationship include: user identity, session identity, user IP address and PCF address; responding to the inquiry of the NEF network element, inquiring the user session binding relation based on the user identity and the session identity, and returning the corresponding user IP address and PCF address to the NEF network element.
10. The system of claim 9, wherein the system further comprises a controller configured to control the controller,
the BSF network element is further configured to register with a user subscription database after establishing a user session binding relationship, and the provided registration information comprises a user identity, a session identity and a BSF network element address; or after the user session is ended, registering information before logging out to the user subscription database.
11. The system of claim 8, further comprising:
the user subscription database is configured to record registration information of the BSF network element, including user identity, session identity and BSF network element address; responding to the inquiry of the NEF network element, inquiring the registration information based on the user identity and the session identity, and returning a corresponding BSF network element address to the NEF network element.
12. A non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the session control method in a network address translation scenario according to any one of claims 1-6.
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| CN113329374A (en) * | 2017-01-05 | 2021-08-31 | 华为技术有限公司 | System and method for application friendly protocol data unit session management |
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| CN106612262A (en) * | 2015-10-27 | 2017-05-03 | 中国电信股份有限公司 | Method, device and system for establishing PCC (Policy Control and Charging) session |
| CN106936779A (en) * | 2015-12-29 | 2017-07-07 | 北京网御星云信息技术有限公司 | A kind of data connecting method, system and device |
| CN113329374A (en) * | 2017-01-05 | 2021-08-31 | 华为技术有限公司 | System and method for application friendly protocol data unit session management |
| WO2019042378A1 (en) * | 2017-08-30 | 2019-03-07 | 中兴通讯股份有限公司 | Method and apparatus for providing user identity information, and storage medium |
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