CN114006884A - Session control method, device and system under network address conversion scene - Google Patents
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- H04L61/00—Network arrangements, protocols or services for addressing or naming
- H04L61/09—Mapping addresses
- H04L61/25—Mapping addresses of the same type
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Abstract
The disclosure provides a session control method, a session control device and a session control system in a network address conversion scene, and relates to the field of communication. The NEF network element receives a first session control strategy change request which is sent by the AF network element and based on a user identity, wherein the first session control strategy change request comprises the user identity and a session identity; inquiring a BSF network element where the user session binding relationship is located from a user subscription database based on the user identity identification and the session identification; inquiring a user IP address and a PCF address from a BSF network element based on the user identity identification and the session identification; converting the first session control strategy changing request into a second session control strategy changing request based on the IP address of the user and sending the second session control strategy changing request to a 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 cannot report the real IP address in the network address conversion scene is solved, and the flexibility and the robustness of user session control are enhanced.
Description
Technical Field
The present disclosure relates to the field of communications, and in particular, to a session control method, apparatus, and system in a network address translation scenario.
Background
In most mobile networks, due to the lack of IPV4 Address, the user Address mostly adopts a private Network Address, and when the user establishes a connection with the outside, the private Network Address needs to be converted into a public Network Address through NAT (Network Address Translation). Therefore, in the NAT environment, if the user does not report its real IP address to an AF (Application function) network element, the AF network element obtains the IP address after NAT conversion instead of the user real IP address, so that the AF network element cannot perform real-time control on the user session control policy based on the IP address, resulting in 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, which solves the problem that an AF (automatic call forwarding) network element cannot control a user session in real time due to the fact that a user cannot report a real IP (Internet protocol) 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 strategy changing request based on a user identity sent by an AF network element, wherein the first session control strategy changing request comprises the user identity and a session identity;
the NEF network element inquires a BSF network element where the user session binding relationship is located from a user subscription database based on the user identity identifier and the session identifier, and the registration information recorded by the user subscription database comprises the user identity identifier, the session identifier 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 the user identity identification and the session identification, wherein the user session binding relationship recorded by the BSF network element comprises the user identity identification, the session identification, the user IP address and the PCF address;
the NEF network element converts the first session control strategy changing request based on the user identity identification into a second session control strategy changing request based on the user IP address, and sends the second session control strategy changing request to a corresponding PCF network element, wherein the second session control strategy changing request comprises the user IP address and the session identification;
and 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.
In some embodiments, the BSF network element obtains the 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 identification, session identification, 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 identifier, a session identifier, and a BSF network element address.
In some embodiments, the BSF network element logs out the previous registration information to the subscriber subscription database after the subscriber 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; and the AF network element only obtains the IP address of the user after the IP address is converted by the network address when sending a first session control strategy change request based on the user identity.
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 execute the session control method in the network address translation scenario 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 the user session related information from the SMF network element and establish 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 identification, session identification, user IP address and PCF address; and responding to the inquiry of the NEF network element, inquiring the user session binding relationship based on the user identity identification and the session identification, and returning a corresponding user IP address and a corresponding PCF address to the NEF network element.
In some embodiments, 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 includes a user identity identifier, a session identifier, and a BSF network element address; or after the user session is finished, the registration information before the user signing database is logged out.
In some embodiments, further comprising: the user subscription database is configured to record registration information of the BSF network element, and the registration information comprises a user identity identifier, a session identifier and a BSF network element address; responding to the inquiry of the NEF network element, inquiring the registration information based on the user identity identification and the session identification, and returning a corresponding BSF network element address to the NEF network element.
Some embodiments of the present disclosure provide a non-transitory computer-readable storage medium having stored thereon a computer program that, when executed by a processor, implements the steps of the session control method in the network address translation scenario of the various embodiments.
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The drawings that will be used in the description of the embodiments or the related art will be briefly described below. The present disclosure can be understood more clearly from the following detailed description, which proceeds with reference to the accompanying drawings.
It is to be understood that the drawings in the following description are merely exemplary of the disclosure, and that other drawings may be derived from those drawings by one of ordinary skill in the art without undue inventive faculty.
Fig. 1 illustrates a schematic diagram of a session control system (abbreviated as "system") in a network address translation scenario in accordance with some embodiments of the present disclosure.
Fig. 2 illustrates a schematic diagram of a session control method in a network address translation scenario according to some embodiments of the present disclosure.
Fig. 3 illustrates a schematic structural diagram of a session control device 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 otherwise specified, "first", "second", and the like in the present disclosure are described to distinguish different objects, and are not intended to mean size, timing, or the like.
Fig. 1 illustrates a schematic diagram of a session control system (abbreviated as "system") in a network address translation scenario in accordance with some embodiments of the present disclosure.
As shown in fig. 1, the system of this embodiment includes: a NEF (Network Exposure Function) Network element, a BSF (Binding Support Function) Network element, a user subscription database such as a UDR (Universal Data Repository) or a UDM (Unified Data Manager), and may further include a SMF (Session Management Function) Network element, a PCF (Policy Control Function) Network element, an NRF (Network storage Function) Network element, an AF (Application Function) Network element, a NAT Network element (Network Address Translation) Network element, and the like.
The embodiment of the disclosure provides a session control scheme in a network address conversion scene, which mainly enhances functions of a user subscription database, a BSF network element and an NEF network element, thereby solving 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 enhancing flexibility and robustness of user session control.
1. Enhancements to user subscription databases (e.g., UDM/UDR) include:
supporting BSF network element registration and cancellation;
and the NEF network element is supported to inquire the BSF network element address of the user session binding relationship through the user identification.
Specifically, the user subscription database is configured to respond to registration of the BSF network element and record registration information of the BSF network element, including a user identity identifier, a session identifier, and a BSF network element address; responding to the inquiry of the NEF network element, inquiring registration information based on the user identity identifier and the session identifier, and returning a corresponding BSF network element address to the NEF network element; and responding to the logout of the BSF network element, and deleting the registration information of the BSF network element.
2. The enhancement of the BSF network element comprises the following steps:
the registration of a user signing database (such as UDM/UDR) after a user session binding relation is established and the logout after the session is ended are supported;
indexing for user session binding relationships based on user identification is supported.
Specifically, the BSF network element is configured to obtain the 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 identification, session identification, user IP address and PCF address; after establishing a user session binding relationship, registering to a user subscription database, wherein the provided registration information comprises a user identity identifier, 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 identification and the session identification, and returning a corresponding user IP address and a corresponding PCF address to the NEF network element; and after the user session is finished, logging out the registration information before logging out to the user subscription database.
3. The enhancement of the NEF network element comprises the following steps:
when a session control policy change request based on a user identifier sent by an AF network element is received, a BSF network element address where a user session binding relationship is located is inquired from a user subscription database (such as UDM/UDR);
the session control strategy changing request of the AF network element based on the user identification is converted into a session control strategy changing request based on the user IP address according to the user IP address returned by the BSF network element;
the method comprises the steps that a session control strategy changing request based on a user IP address is sent to a PCF network element according to the user IP address returned by the BSF network element;
and when the execution result of the session control strategy change request is returned to the AF network element, the user IP address is returned 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 an AF network element, where the first session control policy change request includes the user identity and a session identity; inquiring a BSF network element where a user session binding relationship is located from a user subscription database based on the user identity identification and the session identification, wherein the registration information recorded by the user subscription database comprises the user identity identification, the session identification and a 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 identification and the session identification, wherein the user session binding relationship recorded by the BSF network element comprises the user identity identification, the session identification, the user IP address and the PCF address; converting a first session control strategy changing request based on the user identity identification into a second session control strategy changing request based on the user IP address, and sending the second session control strategy changing request to a corresponding PCF network element, wherein the second session control strategy changing request comprises the user IP address and the session identification; 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; and the AF network element only obtains the IP address of the user after the IP address is converted by the network address when sending a first session control strategy change request based on the user identity.
Specifically, the NEF network element is further configured to, after the AF network element obtains the user IP address, receive, by the NEF network element, a third session control policy change request based on the user IP address and sent by the AF network element during the session, 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 according to 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 through an 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 controlling the current session with the PCF network element.
In step 230, the BSF network element obtains the 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 identification, session identification, user IP address and PCF address.
The BSF network element may also obtain user session related information from the PCF network element.
In step 240, the BSF network element registers with a user subscription database (e.g., UDM/UDR) after establishing the user session binding relationship, and the provided registration information includes the user identity, the session identity, and the BSF network element address.
In step 250, since the UE does not report its IP address, and only the IP address after NAT conversion is available in the AF network element database, during the session, the AF network element initiates a session control policy change based on the user identity, and 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.
The user identity includes, but is not limited to, SUPI (user Permanent Identifier), GPSI (Generic Public user identity), and the like, which can be used to identify the 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 the BSF network element where the user session binding relation is located from a user subscription database based on the user identity identification and the session identification, and the registration information recorded by the user subscription database comprises the user identity identification, the session identification and the BSF network element address. And the user subscription database responds to the inquiry of the NEF network element, inquires the registration information based on the user identity identifier and the session identifier and returns a corresponding BSF network element address to the NEF network element.
In step 270, the NEF network element queries, based on the user identity identifier and the session identifier, the user IP address and the PCF address from the BSF network element where the user session binding relationship is located, where the user session binding relationship recorded by the BSF network element includes the user identity identifier, the session identifier, 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 relationship based on the user identity identification and the session identification, 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 identifier 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 identifier; and the PCF network element executes the second session control strategy 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 user does not report the IP address under the NAT scene by the AF network element is realized.
The NEF network element may further send 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. In the session continuing process, the AF can directly control the session control policy in real time through the NEF network element by using the user IP address in the subsequent change of the session control policy. That is, after the AF network element obtains the user IP address, in the session continuing process, the AF network element sends a third session control policy change request based on the user IP address to the NEF network element, 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, and 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 previous registration information to the subscriber subscription database after the subscriber session is ended.
The embodiment realizes a session control scheme in a network address conversion scene, solves the problem that an AF network element cannot control the user session in real time because a user cannot report the real IP address in the network address conversion scene, and enhances the flexibility and robustness of user session control.
Fig. 3 illustrates a schematic structural diagram of a session control device in a network address translation scenario according to some embodiments of the present disclosure. The device may be set in, for example, a subscriber subscription database, a BSF network element, and an NEF network element, and execute the session control method executed by the subscriber subscription database, the BSF network element, and 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 execute the session control method in the network address translation scenario in any of the embodiments described above based on instructions stored in the memory 310.
The 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, or the like.
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, and a touch screen. The network interface 340 provides a connection interface for various networking devices. The storage interface 350 provides a connection interface for external storage devices such as an SD card and a usb disk. Bus 360 may employ any of a variety of bus architectures. For example, bus structures include, but are not limited to, Industry Standard Architecture (ISA) bus, Micro Channel Architecture (MCA) bus, and Peripheral Component Interconnect (PCI) bus.
Some embodiments of the present disclosure provide a non-transitory computer readable storage medium having stored thereon a computer program, which when executed by a processor, implements the steps of a session control method in a network address translation scenario.
As will be appreciated by one skilled in the art, 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, and so forth) 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 flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams 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 above description is only exemplary of the present disclosure and is not intended to limit the present disclosure, so that any modification, equivalent replacement, or improvement made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure.
Claims (12)
1. A session control method under a network address conversion scene is characterized by comprising the following steps:
the NEF network element receives a first session control strategy changing request based on a user identity sent by an AF network element, wherein the first session control strategy changing request comprises the user identity and a session identity;
the NEF network element inquires a BSF network element where the user session binding relationship is located from a user subscription database based on the user identity identifier and the session identifier, and the registration information recorded by the user subscription database comprises the user identity identifier, the session identifier 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 the user identity identification and the session identification, wherein the user session binding relationship recorded by the BSF network element comprises the user identity identification, the session identification, the user IP address and the PCF address;
the NEF network element converts the first session control strategy changing request based on the user identity identification into a second session control strategy changing request based on the user IP address, and sends the second session control strategy changing request to a corresponding PCF network element, wherein the second session control strategy changing request comprises the user IP address and the session identification;
and 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.
2. The method of claim 1,
the BSF network element acquires the 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 identification, session identification, user IP address and PCF address.
3. The method of claim 2,
after establishing a user session binding relationship, the BSF network element registers to a user subscription database, and the provided registration information comprises a user identity identifier, a session identifier and a BSF network element address.
4. The method of claim 3,
and after the user session is finished, the BSF network element logs out the previous registration information from the user subscription database.
5. The method of claim 1,
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;
and the AF network element only obtains the IP address of the user after the IP address is converted by the network address when sending a first session control strategy change request based on the user identity.
6. The method of claim 5,
after the AF network element obtains the IP address of the user, in the session continuing process, the NEF network element receives a third session control strategy changing request based on the IP address of the user and sent by the AF network element, and forwards the third session control strategy changing request to the PCF network element to change the session control strategy, wherein the third session control strategy changing request comprises the IP address of the user and a 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 execute the session control method in the network address translation scenario of any 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 the user session related information from the SMF network element and establish 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 identification, session identification, user IP address and PCF address; and responding to the inquiry of the NEF network element, inquiring the user session binding relationship based on the user identity identification and the session identification, and returning a corresponding user IP address and a corresponding PCF address to the NEF network element.
10. The system of claim 9,
the BSF network element is also configured to register to a user subscription database after establishing a user session binding relationship, and the provided registration information comprises a user identity identifier, a session identifier and a BSF network element address; or after the user session is finished, the registration information before the user signing database is logged out.
11. The system of claim 8, further comprising:
the user subscription database is configured to record registration information of the BSF network element, and the registration information comprises a user identity identifier, a session identifier and a BSF network element address; responding to the inquiry of the NEF network element, inquiring the registration information based on the user identity identification and the session identification, 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 being executed by a processor, implements the steps of the session control method in the context of network address translation as claimed in any one of claims 1 to 6.
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