CN114158030B - Session binding method, system and storage medium - Google Patents

Session binding method, system and storage medium Download PDF

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Publication number
CN114158030B
CN114158030B CN202111430537.8A CN202111430537A CN114158030B CN 114158030 B CN114158030 B CN 114158030B CN 202111430537 A CN202111430537 A CN 202111430537A CN 114158030 B CN114158030 B CN 114158030B
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China
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pcf
network capability
information
request
response message
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CN114158030A (en
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何宇锋
刘玉芹
单雨威
唐凌
陈思柏
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China Telecom Corp Ltd
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China Telecom Corp Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/18—Processing of user or subscriber data, e.g. subscribed services, user preferences or user profiles; Transfer of user or subscriber data
    • H04W8/20—Transfer of user or subscriber data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/22—Processing or transfer of terminal data, e.g. status or physical capabilities
    • H04W8/24—Transfer of terminal data

Abstract

The present disclosure provides a session binding method, system and storage medium, wherein the method includes: PCF sends network element registration information to NRF, SMF selects target PCF to complete user PDU session creation when terminal creates PDU session; the UPF sends a second network capability calling request to the NEF; the NEF sends a query request to the NRF based on the user number segment information carried in the second network capability call request to acquire PCF available information; the NEF sends a second network capability invocation request to the initial PCF, which performs a session binding operation based on the second network capability invocation request. The method, the system and the storage medium can avoid the problems of unplanned ipDomain information, docking of PCF or BSF different manufacturers and the like in the existing scheme, simplify the capacity calling flow, do not need to limit SMF to select PCF, and are applicable to BSF-free scheme or multi-PCF deployment scene.

Description

Session binding method, system and storage medium
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a session binding method, a session binding system, and a storage medium.
Background
The network element NEF (Network Exposure Function, network opening function) of the 5GC (5G CoreNetwork) needs to solve the problem how to find PCFs (Policy Control Function, policy control functions) addressed to the serving user using capability invocation messages when providing network capabilities for 5G users. In the existing 3GPP protocol, although a BSF (Binding Support Function ) network element is defined for searching for the PCF of the service user, the network element is limited by that the existing network does not plan ipDomain information (ipDomain information is used for searching for the BSF of the visiting place), and the interfacing of the PCF and the BSF is not tested, which causes the difficulty in landing the solution. At present, the existing solution is that the NEF directly queries the PCF information of the service user from the NRF (NF Repository Function, network storage function) through the subscriber number segment (SUPI/GPSI), but the NRF may return a plurality of PCF information meeting the conditions, the NEF needs to search the PCF of the service user through a polling mode, the capability calling efficiency is low, and the calling process is complicated.
Disclosure of Invention
In view of the above, it is an object of the present invention to provide a session binding method, system and storage medium.
According to a first aspect of the present disclosure, there is provided a session binding method, including: the policy control function PCF sends a network element registration message to the network registration and discovery function NRF; wherein, the network element registration message carries user number segment information; when a terminal creates a PDU session, a session management network element SMF acquires PCF information from the NRF, and is used for selecting a target PCF based on the PCF information to complete user PDU session creation; when the terminal initiates a first network capability calling request, the user plane function UPF sends a second network capability calling request to a network element NEF; the NEF sends a query request to the NRF based on the user number segment information carried in the second network capability call request, and the query request is used for acquiring PCF available information corresponding to the query request returned by the NRF; the NEF determines an initial PCF based on the PCF availability information, and sends the second network capability calling request to the initial PCF; the initial PCF requests to perform a session binding operation based on the second network capability invocation.
Optionally, the initial PCF performing a session binding operation based on the second network capability invocation request comprises: and if the initial PCF judges that the user session information corresponding to the second network capability calling request is not saved, the initial PCF sends the second network capability calling request to other PCFs based on an Npcf (network configuration protocol) service interface so that the target PCF executes session binding operation based on the second network capability calling request.
Optionally, the target PCF performing a session binding operation based on the second network capability invocation request comprises: after executing a session binding operation based on the second network capability call request, the target PCF sends a first response message corresponding to the second network capability call request to the initial PCF; the information carried by the first response message includes: PCF instance number of target PCF, N5 interface IP address, sessionID.
Optionally, the initial PCF performing a session binding operation based on the second network capability invocation request comprises: the initial PCF generates a second response message corresponding to the second network capability call request based on the first response message and sends the second response message to the NEF; the information carried by the second response message includes: PCF instance number of target PCF, N5 interface IP address.
Optionally, the NEF determines the target PCF based on the second response message; the NEF sends an update capability call request or a delete capability call request to the target PCF.
Optionally, the second response message includes: a npcf_ Policy Authorization Response message; and adding a field in the NpcfPolicy Authorization Response message, wherein the field is used for carrying the PCF instance number and the N5 interface IP address of the target PCF.
Optionally, the initial PCF performing a session binding operation based on the second network capability invocation request comprises: if the initial PCF judges that the initial PCF itself stores the user session information corresponding to the second network capability calling request, executing session binding operation based on the second network capability calling request; the initial PCF generates a second response message corresponding to the second network capability call request and sends to the NEF.
Optionally, when the terminal initiates the first network capability call request, the UPF sending the second network capability call request to the network element NEF includes: the UPF inserts information for session binding in the first network capability calling request to generate the second network capability calling request; wherein, the information for session binding includes: user number segment information, user ip address, DNN information.
Optionally, the selecting the target PCF to complete the user PDU session creation based on the PCF information comprises: the SMF selects a PCF from a PCF pool based on the PCF information as the target PCF; the target PCF establishes an N5 session to complete user PDU session creation.
Optionally, the user number segment information includes: SUPI, GPSI.
According to a second aspect of the present disclosure, there is provided a session binding system comprising: PCF for sending network element registration message to NRF; wherein, the network element registration message carries user number segment information; the SMF is used for acquiring PCF information from the NRF when the terminal creates the PDU session, and selecting a target PCF based on the PCF information to complete user PDU session creation; the UPF is used for sending a second network capability calling request to the network element NEF when the terminal initiates the first network capability calling request; a NEF, configured to send a query request to the NRF based on the user number segment information carried in the second network capability call request, where the query request is used to obtain PCF availability information returned by the NRF and corresponding to the query request; determining an initial PCF based on the PCF availability information, and sending the second network capability calling request to the initial PCF; the initial PCF is used for executing session binding operation based on the second network capability calling request.
Optionally, the initial PCF is configured to send, if it is determined that the user session information corresponding to the second network capability invocation request is not saved, the second network capability invocation request to other PCFs based on an npcf_policy relay service interface, so that the target PCF performs a session binding operation based on the second network capability invocation request.
Optionally, the target PCF is configured to send, after performing a session binding operation based on the second network capability invocation request, a first response message corresponding to the second network capability invocation request to the initial PCF; the information carried by the first response message includes: PCF instance number of target PCF, N5 interface IP address, sessionID.
Optionally, the initial PCF is further configured to generate a second response message corresponding to the second network capability invocation request based on the first response message, and send the second response message to the NEF; the information carried by the second response message includes: PCF instance number of target PCF, N5 interface IP address.
Optionally, the NEF is configured to determine, based on the second response message, the target PCF, and send an update capability call request or a delete capability call request to the target PCF.
Optionally, the second response message includes: a npcf_ Policy Authorization Response message; and adding fields in the NpcfPolicy Authorization Response message, wherein the fields are used for carrying the PCF instance number and the N5 interface IP address of the target PCF.
Optionally, the initial PCF is configured to execute a session binding operation based on the second network capability call request if it is determined that the initial PCF itself stores user session information corresponding to the second network capability call request; and generating a second response message corresponding to the second network capability call request and sending the second response message to the NEF.
Optionally, the UPF is configured to insert information for session binding in the first network capability call request, and generate the second network capability call request; wherein, the information for session binding includes: user number segment information, user ip address, DNN information.
Optionally, the SMF is configured to select a PCF from a PCF pool based on the PCF information, as the target PCF; the target PCF establishes an N5 session to complete user PDU session creation.
Optionally, the user number segment information includes: SUPI, GPSI.
According to a third aspect of the present disclosure, there is provided a computer readable storage medium storing computer instructions for execution by a processor of a method as described above.
The session binding method, the session binding system and the storage medium can avoid the problems that in the existing scheme, ipDomain information is not planned, PCF or BSF is in butt joint with different manufacturers, and the like, simplify the capacity calling flow, do not need to limit SMF to select PCF, are applicable to BSF-free schemes or multi-PCF deployment scenes, and are applicable to 5GC network element selection schemes in various scenes.
Drawings
In order to more clearly illustrate the embodiments of the present disclosure or the solutions in the prior art, a brief description will be given below of the drawings required for the embodiments or the description of the prior art, it being obvious that the drawings in the following description are only some embodiments of the present disclosure, and that other drawings may be obtained according to these drawings without inventive faculty for a person skilled in the art.
FIGS. 1 and 2 are schematic diagrams of a session binding method in the prior art;
FIG. 3 is a flow diagram of one embodiment of a session binding method according to the present disclosure;
FIG. 4 is a flow diagram of another embodiment of a session binding method according to the present disclosure;
fig. 5 is a block diagram of one embodiment of a session binding system according to the present disclosure.
Detailed Description
The present disclosure now will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the disclosure are shown. The following description of the technical solutions in the embodiments of the present disclosure will be made clearly and completely with reference to the accompanying drawings in the embodiments of the present disclosure, and it is apparent that the described embodiments are only some embodiments of the present disclosure, not all embodiments. Based on the embodiments in this disclosure, all other embodiments that a person of ordinary skill in the art would obtain without making any inventive effort are within the scope of protection of this disclosure.
The following "first", "second", etc. are used merely to describe differences and are not otherwise specifically meant.
In the prior art, when the NEF queries the NRF for obtaining PCF information through user number segment information (SUPI/GPSI), the NRF returns a plurality of PCF information. In order to find out the PCF of the service user, the NEF needs to enhance and support the PCF polling function, that is, send network capability call messages to multiple PCFs one by one until the PCF of the service user is hit to return session binding success information, thus resulting in low capability call efficiency and complicated call flow.
As shown in fig. 1, in step 101, the bsf registers with the NRF, carrying supported ipv4+ipdomain; step 102, PDU session creation, PCF inquires NRF to obtain BSF, registers session binding information based on ipv4+ipDomain on BSF; step 103, NEF queries BSF information from NRF based on ipv4+ipDomain; step 104, the NEF inquires PCF information from the BSF based on the ipv4+ipDomain; step 105, NEF interacts with PCF. The above method has the following limitations: 1. ipDomain has not yet been planned; 2. cross-province roaming involves the interfacing of PCF and BSF heterogeneous manufacturers, as yet untested; 3. considering the complexity of initial BSF network element deployment and technical scheme implementation, the scheme problem when no BSF exists is considered.
As shown in fig. 2, in step 201, a network element registers SUPI or GPSI carrying number segment information; in step 202, the nef may obtain PCF information through an NRF query interface, and query key parameters: SUPI or GPSI; in step 203, the NEF queries a plurality of PCFs meeting the conditions, and needs to poll the PCFs for capability call messages until the PCFs of the service user are hit. The above method has the following limitations: 1. the capacity calling efficiency is low; 2. the call flow is complicated.
Fig. 3 is a flow diagram of one embodiment of a session binding method according to the present disclosure, as shown in fig. 3:
step 301, pcf sends network element registration message to NRF; wherein, the network element registration message carries the user number segment information. The user number segment information includes SUPI, GPSI, and the like.
In step 302, when the terminal creates a PDU (Protocol Data Unit, protocol data unit PDU) session, the smf (Session Management Function ) acquires PCF information from the NRF to select a target PCF based on the PCF information to complete user PDU session creation.
In step 303, the upf (User plane Function ) sends a second network capability call request to the NEF when the terminal initiates the first network capability call request.
And step 304, the NEF sends a query request to the NRF based on the user number segment information carried in the second network capability call request, so as to acquire PCF available information corresponding to the query request returned by the NRF.
In step 305, the nef determines the initial PCF based on the PCF availability information and sends a second network capability invocation request to the initial PCF.
At step 306, the initial PCF performs a session binding operation based on the second network capability invocation request.
According to the session binding method, the PCF enhancement function is used for forwarding the capacity calling information among PCFs, the PCF of the service user returns the session binding result, the PCF of the initial access responds to the NEF and carries the information of the PCF of the service user, the problems that the ipDomain information is not planned and the PCF/BSF different manufacturer is in butt joint in the existing scheme can be avoided, meanwhile, the capacity calling process can be simplified, and the SMF is not required to be limited to select the PCF.
In one embodiment, the initial PCF may use a variety of methods to perform the session binding operation based on the second network capability invocation request. For example, if the initial PCF determines that the user session information corresponding to the second network capability invocation request is not saved, the second network capability invocation request is sent to the other PCFs based on the npcf_policy relay service interface, so that the target PCF performs the session binding operation based on the second network capability invocation request.
After executing the session binding operation based on the second network capability call request, the target PCF sends a first response message corresponding to the second network capability call request to the initial PCF, wherein the information carried by the first response message comprises the PCF instance number, the N5 interface IP address, the SessionID and the like of the target PCF.
The initial PCF generates a second response message corresponding to the second network capability call request based on the first response message and sends the second response message to the NEF, wherein the information carried by the second response message comprises the PCF instance number and the N5 interface IP address of the target PCF.
The NEF determines the target PCF based on a second response message, which includes an npcf_ Policy Authorization Response message, etc., and sends an update capability call request or delete capability call request to the target PCF. Fields are added in the NpcfPolicy Authorization Response message, and the fields are used for carrying information such as PCF instance numbers of target PCFs, N5 interface IP addresses and the like.
For example, the initial PCF (Original PCF) sends an npcf_ Policy Authorization Response message to the NEF, which needs to be enhanced to carry N5 interface IP, nfInstanceId information (PCF instance number of target PCF) for updating and deleting the subsequent capability invocation information, and sends a request to the target PCF (target PCF) when the NEF Update/Delete capability invocation message.
If the initial PCF judges that the user session information corresponding to the second network capability calling request is stored, the initial PCF executes the session binding operation based on the second network capability calling request. The initial PCF generates a second response message corresponding to the second network capability call request and sends to the NEF. The UPF inserts information for carrying out session binding in the first network capability calling request, and generates a second network capability calling request, wherein the information for carrying out session binding comprises user number segment information, user ip address, DNN information and the like. The SMF selects a PCF from the PCF pool based on PCF information as a target PCF, and the target PCF establishes an N5 session for completing user PDU session creation.
For example, when receiving a network capability call request message of a NEF, an Original PCF (PCF initially accessed by the NEF, which is determined by random selection) in the Pool cannot execute session binding if it is queried that user session information does not exist based on user ip address+dnn information, the Original PCF needs to send the network capability call request message to other peer PCFs in the Pool based on an enhanced npcf_policy service interface.
When a user creates a PDU session, a Target PCF (PCF selected by an SMF for storing user session information) in the PooL receives a network capability call request message forwarded by an Original PCF (initial PCF) and carries a PCF instance number (NfInstanceId), an N5 interface IP address, a created session id, etc. of the Target PCF (Target PCF) in a response message of the Target PCF after the session binding is successfully executed.
In the response message replied to the NEF by the Original PCF, the information carrying the Target PCF N5 interface IP, nfInstanceId is enhanced, and when the subsequent NEF performs the update and deletion operation of the capability call information, the message can be directly sent to the Target PCF where the user session information is located.
When the existing network has a plurality of PCF service users with the same number, the NEF performs network capacity calling, the PCF which needs to find the service users executes Session binding, and the PCF mutually forwards capacity calling messages through a newly added servitization interface so as to realize the requirements.
When the PCF newly adds the npcf_policy service, and forwards a network capability call message (npcf_ Policy Authorization Request) of the NEF request between peer PCFs, and the Target PCF of the service user returns a successful session binding result, the response message needs to be enhanced to carry an instance number (NfInstanceId), a corresponding N5 interface IP address, and the like.
The Original PCF of the initial access returns the corresponding information to the NEF for updating, deleting and the like of the subsequent capability calling information. The session binding method disclosed by the invention can be applied to a BSF-free scheme or a multi-PCF deployment scene, and is applicable to a 5GC network element selection scheme in various scenes.
Fig. 4 is a flow chart of another embodiment of a session binding method according to the present disclosure, where PCF carries supported segment information SUPI, GPSI when registering with NRF, as shown in fig. 4:
step 401, user creates a PDU session. The SMF inquires PCF information from the NRF, selects one PCF in the Pool based on the existing load sharing mode to establish an N5 session, and completes the session policy information creation process.
Step 402, a user initiates a 5G network capability call request, the UPF configures an http header enhancement policy, and inserts information for session binding, such as SUPI, GPSI, user ip address, DNN, etc., into the 5G network capability call request based on the user context information.
In step 403, the nef receives the user request information, initiates a query request to the NRF based on the user number segment information SUPI/GPSI, and the NRF returns a plurality of PCF information meeting the query condition.
In step 404, the nef sends a npcf_ Policy Authorization Request request to any one of the tables PCF (Original PCF) in Pool to perform session binding.
Step 405, the original PCF determines whether to perform the corresponding user session binding, and if not, proceeds to step 406.
In step 406, the original PCF queries that the user session information does not exist based on the user ip address+dnn information, and sends policy authorization requests to other peer PCFs in the Pool based on the new npcf_policy relay service interface, so as to find out PCFs serving the user to perform session binding.
After the Target PCF correctly completes the user session binding execution, the PCF instance number (nflnstanceid), the N5 interface IP address, the successfully created SessionID, etc. are returned to the Original PCF. The Original PCF sent the nf_ Policy Authorization Response message to the NEF that needs to be enhanced to carry the N5 interface IP, nfInstanceId information for the subsequent updating and deleting of the capability call information.
In one embodiment, as shown in fig. 5, the present disclosure provides a session binding system comprising Pool 51, NRF52, NEF53, SMF54, and UPF55; the Pool 51 is provided with PCF511,512,513 … … n. All PCFs send network element registration messages to NRF52, the network element registration messages carrying subscriber number segment information.
When the terminal creates a PDU session, the SMF54 obtains PCF information from the NRF52 to select a target PCF based on the PCF information to complete the user PDU session creation. The UPF55 sends a second network capability call request to the network element for network opening NEF when the terminal initiates the first network capability call request.
The NEF53 sends a query request to the NRF52 based on the user number segment information carried in the second network capability call request, so as to obtain PCF availability information corresponding to the query request returned by the NRF 52. NEF53 determines initial PCF512 from PCFs 511,512,513 … … n based on PCF availability information, and sends a second network capability invocation request to initial PCF 512. Initial PCF512 performs a session binding operation based on the second network capability call request.
In one embodiment, if initial PCF512 determines that the user session information corresponding to the second network capability invocation request is not saved, then based on the npcf_policyrelay service interface, it sends the second network capability invocation request to the other PCFs to cause target PCF513 to perform a session binding operation based on the second network capability invocation request.
After performing the session binding operation based on the second network capability invocation request, the target PCF513 sends a first response message corresponding to the second network capability invocation request to the initial PCF512, where the information carried by the first response message includes the PCF instance number, the N5 interface IP address, the SessionID, and the like of the target PCF 513.
Initial PCF512 generates a second response message corresponding to the second network capability call request based on the first response message and sends to NEF53; the information carried by the second response message includes the PCF instance number of the target PCF513, the N5 interface IP address, and so on.
NEF53 determines target PCF513 based on a second response message, which includes: the npcf_ Policy Authorization Response message adds fields in NpcfPolicy Authorization Response message for carrying PCF instance number, N5 interface IP address, etc. of target PCF 513.
If the initial PCF512 determines that it stores the user session information corresponding to the second network capability invocation request, it performs a session binding operation based on the second network capability invocation request. Initial PCF512 generates a second response message corresponding to the second network capability call request and sends it to NEF53.
The UPF55 inserts information for performing session binding in the first network capability call request, and generates a second network capability call request, where the information for performing session binding includes user number segment information, user ip address, and DNN information. The SMF54 selects a PCF from the PCF pool based on PCF information as the target PCF513, and the target PCF513 establishes an N5 session to complete the user PDU session creation.
In one embodiment, the present disclosure provides a computer readable storage medium storing computer instructions that when executed by a processor implement the session binding method of any of the embodiments above.
The session binding method, the session binding system and the storage medium in the embodiment can avoid the problems that the ipDomain information is not planned, the PCF or the BSF is in butt joint with different factories in the prior scheme, simplify the capacity calling flow, do not need to limit the SMF to select the PCF, are applicable to BSF-free schemes or multi-PCF deployment scenes, and are applicable to 5GC network element selection schemes in various scenes.
The methods and systems of the present disclosure may be implemented in a number of ways. For example, the methods and systems of the present disclosure may be implemented by software, hardware, firmware, or any combination of software, hardware, firmware. The above-described sequence of steps for the method is for illustration only, and the steps of the method of the present disclosure are not limited to the sequence specifically described above unless specifically stated otherwise. Furthermore, in some embodiments, the present disclosure may also be implemented as programs recorded in a recording medium, the programs including machine-readable instructions for implementing the methods according to the present disclosure. Thus, the present disclosure also covers a recording medium storing a program for executing the method according to the present disclosure.
The description of the present disclosure has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the disclosure in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments were chosen and described in order to best explain the principles of the disclosure and the practical application, and to enable others of ordinary skill in the art to understand the disclosure for various embodiments with various modifications as are suited to the particular use contemplated.

Claims (21)

1. A session binding method, comprising:
the policy control function PCF sends a network element registration message to the network registration and discovery function NRF; wherein, the network element registration message carries user number segment information;
when a terminal creates a PDU session, a session management network element SMF acquires PCF information from the NRF, and is used for selecting a target PCF based on the PCF information to complete user PDU session creation;
when the terminal initiates a first network capability calling request, the user plane function UPF sends a second network capability calling request to a network element NEF;
the NEF sends a query request to the NRF based on the user number segment information carried in the second network capability call request, and the query request is used for acquiring PCF available information corresponding to the query request returned by the NRF;
the NEF determines an initial PCF based on the PCF availability information, and sends the second network capability calling request to the initial PCF;
the initial PCF requests to perform a session binding operation based on the second network capability invocation.
2. The method of claim 1, the initial PCF requesting to perform a session binding operation based on the second network capability invocation request comprising:
and if the initial PCF judges that the user session information corresponding to the second network capability calling request is not saved, the initial PCF sends the second network capability calling request to other PCFs based on an Npcf (network configuration protocol) service interface so that the target PCF executes session binding operation based on the second network capability calling request.
3. The method of claim 2, the target PCF requesting to perform a session binding operation based on the second network capability invocation request comprising:
after executing a session binding operation based on the second network capability call request, the target PCF sends a first response message corresponding to the second network capability call request to the initial PCF;
the information carried by the first response message includes: PCF instance number of target PCF, N5 interface IP address, sessionID.
4. The method of claim 3, the initial PCF requesting to perform a session binding operation based on the second network capability call comprises:
the initial PCF generates a second response message corresponding to the second network capability call request based on the first response message and sends the second response message to the NEF;
the information carried by the second response message includes: PCF instance number of target PCF, N5 interface IP address.
5. The method of claim 4, further comprising:
the NEF determining the target PCF based on the second response message;
the NEF sends an update capability call request or a delete capability call request to the target PCF.
6. The method of claim 4, wherein,
the second response message includes: a npcf_ Policy Authorization Response message;
and adding a field in the npcf_ Policy Authorization Response message, wherein the field is used for carrying the PCF instance number and the N5 interface IP address of the target PCF.
7. The method of claim 4, the initial PCF requesting to perform a session binding operation based on the second network capability call comprises:
if the initial PCF judges that the initial PCF itself stores the user session information corresponding to the second network capability calling request, executing session binding operation based on the second network capability calling request;
the initial PCF generates a second response message corresponding to the second network capability call request and sends to the NEF.
8. The method of claim 1, wherein the UPF sending a second network capability call request to a network element, NEF, when the terminal initiates the first network capability call request comprises:
the UPF inserts information for session binding in the first network capability calling request to generate the second network capability calling request;
wherein, the information for session binding includes: user number segment information, user ip address, DNN information.
9. The method of claim 1, wherein the selecting the target PCF to complete user PDU session creation based on the PCF information comprises:
the SMF selects a PCF from a PCF pool based on the PCF information as the target PCF; the target PCF establishes an N5 session to complete user PDU session creation.
10. The method according to any one of claim 1 to 9, wherein,
the user number segment information includes: SUPI, GPSI.
11. A session binding system, comprising:
PCF for sending network element registration message to NRF; wherein, the network element registration message carries user number segment information;
the SMF is used for acquiring PCF information from the NRF when the terminal creates the PDU session, and selecting a target PCF based on the PCF information to complete user PDU session creation;
the UPF is used for sending a second network capability calling request to the network element NEF when the terminal initiates the first network capability calling request;
a NEF, configured to send a query request to the NRF based on the user number segment information carried in the second network capability call request, where the query request is used to obtain PCF availability information returned by the NRF and corresponding to the query request; determining an initial PCF based on the PCF availability information, and sending the second network capability calling request to the initial PCF;
the initial PCF is used for executing session binding operation based on the second network capability calling request.
12. The system of claim 11, wherein,
and the initial PCF is used for sending the second network capability calling request to other PCFs based on the Npcf_PolicyRelay service interface if the user session information corresponding to the second network capability calling request is not judged to be saved, so that the target PCF executes session binding operation based on the second network capability calling request.
13. The system of claim 12, wherein,
the target PCF is used for sending a first response message corresponding to the second network capability calling request to the initial PCF after executing the session binding operation based on the second network capability calling request; the information carried by the first response message includes: PCF instance number of target PCF, N5 interface IP address, sessionID.
14. The system of claim 13, wherein,
the initial PCF is further configured to generate a second response message corresponding to the second network capability call request based on the first response message, and send the second response message to the NEF; the information carried by the second response message includes: PCF instance number of target PCF, N5 interface IP address.
15. The system of claim 14, further comprising:
and the NEF is used for determining the target PCF based on the second response message and sending an update capability calling request or a delete capability calling request to the target PCF.
16. The system of claim 14, wherein,
the second response message includes: a npcf_ Policy Authorization Response message; and adding a field in the npcf_ Policy Authorization Response message, wherein the field is used for carrying the PCF instance number and the N5 interface IP address of the target PCF.
17. The system of claim 14, wherein,
the initial PCF is used for executing session binding operation based on the second network capability calling request if judging that the initial PCF itself stores the user session information corresponding to the second network capability calling request; and generating a second response message corresponding to the second network capability call request and sending the second response message to the NEF.
18. The system of claim 11, wherein,
the UPF is used for inserting information for session binding into the first network capability calling request and generating the second network capability calling request; wherein, the information for session binding includes: user number segment information, user ip address, DNN information.
19. The system of claim 11, wherein,
the SMF is used for selecting a PCF from a PCF pool based on the PCF information as the target PCF; the target PCF establishes an N5 session to complete user PDU session creation.
20. The system of any one of claim 11 to 19, wherein,
the user number segment information includes: SUPI, GPSI.
21. A computer readable storage medium storing computer instructions for execution by a processor of the method of any one of claims 1 to 10.
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