CN115515218B - Session management method, system and storage medium - Google Patents

Session management method, system and storage medium Download PDF

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Publication number
CN115515218B
CN115515218B CN202110697508.1A CN202110697508A CN115515218B CN 115515218 B CN115515218 B CN 115515218B CN 202110697508 A CN202110697508 A CN 202110697508A CN 115515218 B CN115515218 B CN 115515218B
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network element
pcf
bsf
pcf network
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CN115515218A (en
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陈卓怡
龙彪
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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
    • H04W60/00—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M15/00—Arrangements for metering, time-control or time indication ; Metering, charging or billing arrangements for voice wireline or wireless communications, e.g. VoIP
    • H04M15/66—Policy and charging system
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/24—Accounting or billing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/08—Upper layer protocols
    • H04W80/10—Upper layer protocols adapted for application session management, e.g. SIP [Session Initiation Protocol]

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The disclosure provides a session management method, a session management system and a storage medium, and relates to the technical field of mobile communication. The session management method disclosed by the disclosure comprises the following steps: the method comprises the steps that an access and mobility AM-Policy Control Function (PCF) network element sends a session management (SM-PCF) network element query request for a session of a target user to a registered Binding Support Function (BSF) network element, wherein an AM-PCF network element and an SM-PCF network element serving the same user are registered to the same BSF network element; the BSF network element determines an SM-PCF network element serving the target user according to the registration information and feeds back the SM-PCF network element to the AM-PCF network element; the AM-PCF network element interacts with the SM-PCF network element according to the feedback information. By the method, the step of searching the SM-PCF network element by the AM-PCF network element is reduced, and the interaction efficiency of the SM-PCF network element and the AM-PCF network element is improved; in addition, the AM-PCF network element only needs to send a query request to one BSF network element, thereby reducing signaling waste.

Description

Session management method, system and storage medium
Technical Field
The present disclosure relates to the field of mobile communications technologies, and in particular, to a session management method, system, and storage medium.
Background
3GPP R15 defines policy and charging control policy architecture for 5G networks, and is divided into PCF (Policy Control Function, policy control function network element) oriented to users, called PCF for User Equipment (UE), and PCF oriented to Session, called PCF for PDU (Protocol Data Unit ) Session
PCF for UE also known as AM (ACCESS AND Mobility, access and mobile) -PCF; PCF for PDU Session is also referred to as SM (Session Management ) -PCF network element.
The AM-PCF network element and the SM-PCF network element dynamically adjust the access and mobility of the user and the policy of PDU session QoS (Quality of Service ) from different dimensions, respectively.
In the network capability extension research project of R17, such as DCAMP (DYNAMICALLY CHANGING AM Policies, dynamic configuration access management policy) project, a requirement for the AM-PCF to interact with the SM-PCF is proposed, so that the AM-PCF can also obtain session related information, that is, obtain information about an application that is being used by the media plane, such as start/stop.
Disclosure of Invention
It is an object of the present disclosure to improve the efficiency of AM-PCF network element interactions with SM-PCF network elements.
According to an aspect of some embodiments of the present disclosure, a session management method is provided, including: the AM-PCF network element sends an SM-PCF network element inquiry request aiming at the session of the target user to a registered BSF (Binding Support Function ) network element, wherein the AM-PCF network element and the SM-PCF network element serving the same user are registered to the same BSF network element; the BSF network element determines an SM-PCF network element serving the target user according to the registration information and feeds back the SM-PCF network element to the AM-PCF network element; the AM-PCF network element interacts with the SM-PCF network element according to the feedback information.
In some embodiments, the feedback information includes a communication address or identity of the SM-PCF network element of the target user.
In some embodiments, the session management method further comprises: the NEF (Network Exposure Function, network open function) network element receives PCF inquiry information aiming at a target user; the NEF network element determines SUPI (subscriber permanent identifier) or GPSI (Generic Public Subscription Identifier, general public user identifier) of the target user according to the IP address in the PCF query information; the NEF network element determines an AM-PCF network element and a SM-PCF network element of the target user to register to a BSF network element according to SUPI or GPSI, and sends a user PCF query request; the BSF network element determines an AM-PCF network element and an SM-PCF network element serving the target user according to the registration information.
In some embodiments, the session management method further comprises: in the process of establishing or modifying the user session, the SMF network element indicates the BSF network element corresponding to the identification of the SM-PCF network element registered to the BSF network element according to the identification of the BSF network element registered to the AM-PCF network element provided by the AMF network element.
In some embodiments, the SMF indicates, according to the identifier of the BSF network element to which the AM-PCF network element provided by the AMF is registered, a BSF network element corresponding to the identifier of the SM-PCF network element registered to the BSF network element, including: the AMF network element carries the identification of the BSF network element when initiating session creation or modification to the SMF network element; the SMF network element sends the identification of the BSF network element to the SM-PCF network element; the SMF-PCF network element registers to the corresponding BSF network element according to the identification of the BSF network element.
In some embodiments, the session management method further comprises: in the process of establishing or modifying the AM strategy, the AMF network element obtains the identification of the BSF network element registered by the AM-PCF network element from the AM-PCF network element.
In some embodiments, the AMF obtaining, from the AM-PCF network element, an identity of a BSF network element to which the AM-PCF network element is registered comprises: the AM-PCF network element registers to the BSF network element, and acquires the identification of the registered BSF network element; the AM-PCF network element feeds back the identification of the BSF network element to the AMF network element.
In some embodiments, the SMF network element controls the establishment request to carry the identifier of the BSF network element through the SM policy, and sends the identifier to the SM-PCF network element.
In some embodiments, the AM-PCF network element sends the AM policy control response carrying the identity of the BSF network element to the AMF network element.
In some embodiments, the session management method further comprises: in the process of establishing or modifying the AM strategy, the AM-PCF network element or the AM-PCF network element writes the identification of the BSF network element into the UDR through the AMF network element; and in the process of establishing or modifying the user session, the SM-PCF network element or the SM-PCF network element inquires the identifier of the BSF network element corresponding to the target user stored in the UDR through the SMF network element, and registers to the BSF network element corresponding to the identifier of the BSF network element.
According to an aspect of some embodiments of the present disclosure, there is provided a session management system including: the AM-PCF network element is configured to send an SM-PCF network element inquiry request for the session of the target user to the registered BSF network element, and interact with the SM-PCF network element according to feedback information of the BSF network element; the BSF network element is configured to determine an SM-PCF network element serving the target user according to the registration information and feed back the SM-PCF network element to the AM-PCF network element; and an SM-PCF network element configured to register with the same BSF network element as the AM-PCF network element serving the same user.
In some embodiments, the session management system further comprises a NEF network element configured to: receiving PCF inquiry information aiming at a target user; determining SUPI or GPSI of the target user according to the IP address in the PCF inquiry information; determining the AM-PCF network element and the BSF network element registered by the SM-PCF network element of the target user according to SUPI or GPSI, and sending a user PCF inquiry request; the BSF network element is further configured to determine an AM-PCF network element and an SM-PCF network element serving the target user based on the registration information.
In some embodiments, the session management system further comprises: and the SMF network element is configured to instruct the SM-PCF network element to register to the BSF network element corresponding to the identifier of the BSF network element according to the identifier of the BSF network element registered to the AM-PCF network element provided by the AMF network element in the process of establishing or modifying the user session.
In some embodiments, the session management system further comprises an AMF network element configured to carry an identification of the BSF network element when session creation or modification is initiated to the SMF network element; the SMF network element is configured to send the identification of the BSF network element to the SM-PCF network element; the SMF-PCF network element is further configured to register to a corresponding BSF network element according to the identity of the BSF network element.
In some embodiments, the session management system further comprises: the AMF network element is further configured to obtain, from the AM-PCF network element, an identity of the BSF network element to which the AM-PCF network element is registered in a process of establishing or modifying the AM policy.
In some embodiments, the AM-PCF network element is further configured to register with the BSF network element, obtain an identity of the BSF network element registered with the AM-PCF network element, and feed back the identity of the BSF network element to the AMF network element.
In some embodiments, the AM-PCF network element is further configured to: in the process of establishing or modifying the AM strategy, writing the identification of the BSF network element into the UDR, or providing the identification of the BSF network element for the AMF network element so that the AMF network element writes the identification of the BSF network element into the UDR; the SM-PCF network element is further configured to: inquiring the identification of the BSF network element corresponding to the target user stored in the UDR or acquiring the identification of the BSF network element corresponding to the target user inquired from the UDR by the SMF network element in the process of establishing or modifying the user session; and registering the BSF network element corresponding to the identifier of the BSF network element.
According to an aspect of some embodiments of the present disclosure, there is provided a session management system including: a memory; and a processor coupled to the memory, the processor configured to perform any of the session management methods above based on instructions stored in the memory.
According to an aspect of some embodiments of the present disclosure, a computer-readable storage medium is presented, on which computer program instructions are stored, which instructions, when executed by a processor, implement the steps of any one of the session management methods above.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate and explain the present disclosure, and together with the description serve to explain the present disclosure. In the drawings:
fig. 1 is a flow chart of some embodiments of a session management method of the present disclosure.
Fig. 2 is a flow chart of other embodiments of the session management method of the present disclosure.
Fig. 3 is a flow chart of yet other embodiments of the session management method of the present disclosure.
Fig. 4 is a schematic diagram of some embodiments of a session management system of the present disclosure.
Fig. 5 is a schematic diagram of some embodiments of an interaction flow of a session management system of the present disclosure.
Fig. 6 is a schematic diagram of further embodiments of a session management system of the present disclosure.
Fig. 7 is a schematic diagram of yet other embodiments of a session management system of the present disclosure.
Detailed Description
The technical scheme of the present disclosure is described in further detail below through the accompanying drawings and examples.
In the current R16 standard, PCF and served user or session information are recorded in a random BSF. In order to find the SM-PCF that serves the specified session of the specified user, the AM-PCF needs to query the NRF (NF Repository Function, network storage function) for a set of BSFs that serve the specified DNN (Data Network Name ) or S-NSSAI (Single Network Slice Selection Assistance Information, single network slice selection assistance information), the set of BSFs comprising a plurality of BSF network elements. And the information of the SM-PCF network element required by registering to the BSF network element from the SM-PCF is registered by initiating inquiry requests to each BSF network element.
The inventor finds that for networks with huge number of users, complex service types and numerous BSF and PCF, the scheme efficiency in the related technology brings huge pressure to the related NRF, BSF, AM-PCF, and the redundant invalid signaling interaction also brings huge pressure to the networks.
A flow chart of some embodiments of the session management method of the present disclosure is shown in fig. 1.
In step 130, the AM-PCF network element sends an SM-PCF network element query request for the target user's session to the BSF network element to which it is registered. The AM-PCF network element and the SM-PCF network element serving the same user are registered to the same BSF network element, namely SM-PCF network elements corresponding to a plurality of sessions of the user are registered to the same BSF network element with the AM-PCF network element corresponding to the user, so that the BSF network element can be ensured to inquire about the SM-PCF network element of the session of the target user.
In step 140, the BSF network element determines an SM-PCF network element serving the target user according to the registration information, and feeds back the SM-PCF network element to the AM-PCF network element. In some embodiments, the feedback information includes a communication address or an identifier of the SM-PCF network element of the target user, so that the AM-PCF can determine how to establish a signal connection with the SM-PCF network element.
In step 150, the AM-PCF network element interacts with the SM-PCF network element based on the feedback information.
By the method, the AM-PCF network element can directly initiate a request for searching the SM-PCF network element to the BSF network element, and can successfully obtain feedback, so that the step of searching the SM-PCF network element by the AM-PCF network element is reduced, the searching time is shortened, and the interaction efficiency of the SM-PCF network element and the AM-PCF network element is improved; in addition, the AM-PCF network element only needs to send a query request to one BSF network element, and does not need to send the query request to each network element in the BSF set, so that the signaling waste is reduced.
In some embodiments, to ensure that the AM-PCF network element and the SM-PCF network element serving the same user register to the same BSF network element, during the process of establishing or modifying the user session, the SMF network element may instruct the SM-PCF network element to register to the BSF network element corresponding to the identifier of the BSF network element according to the identifier of the BSF network element to which the AM-PCF network element is registered provided by the AMF network element.
By the method, the AM-PCF network element and the SM-PCF network element are controlled to register to the same BSF network element in the process of establishing or modifying the user session after the user terminal initiates the session, so that the AM-PCF network element and the SM-PCF network element are ensured to register to the same BSF network element all the time in the whole session maintaining process, the steps shown in the figure 1 can be successful in the subsequent execution, and the reliability of SM-PCF searching is improved.
In some embodiments, the execution of step 130 may be triggered when the AM-PCF needs to query the information of the application used by the user plane. For example: the third party application sends an access policy request to the operator, specifies policies such as selecting a particular access technology or service area restriction release, and specifies that the application should be validated when the user uses the application, and the application is stopped and disabled. To implement such policies, the AM-PCF performs related RFSP Index (RAT/Frequency of Selection Priority Index, radio frequency selection priority Index) or SAR (SERVICE AREA RESTRICT, service area restriction) policies. The AM-PCF needs to find the relevant SM-PCF for the session serving the application. The start and end signals of the user plane application detected by the UPF (User Plane Function ) are acquired through the path of the UPF-SMF- (SM-PCF).
By the method, the service deployment and control efficiency can be improved and the signaling burden can be reduced while the diversified application services can be conveniently provided.
In some embodiments, the UE may have a plurality of IP addresses belonging to different subnets, and the BSF to which the user is registered may be planned according to the SUPI or GPSI information of the UE, so as to avoid the problem that a single user belongs to a plurality of different subnets and causes confusion of BSF allocation. In some embodiments, when the PCF corresponding to the user needs to be determined, for example, when the third party AF (Application Function ) network element needs to determine the PCF corresponding to the user so as to request the related function, the AF does not have SUPI and GPSI information of the UE, and can only acquire the IP address of the UE. The NEF network element receives PCF query information for the target user, wherein the PCF query information can comprise the IP address of the target user. And the NEF network element determines SUPI or GPSI of the target user according to the acquired IP address. In some embodiments, the NEF network element may determine the SUPI or GPSI of the user according to a pre-stored correspondence between the IP address and the SUPI or GPSI of the user. According to allocation policy of BSF in NRF for SUPI or GPSI, NEF network element determines AM-PCF network element of target user and BSF network element registered by SM-PCF network element, and sends user PCF query request to corresponding BSF. The BSF network element determines an AM-PCF network element and an SM-PCF network element serving the target user based on the registration information and a user identification from the NEF, such as SUPI or GPSI of the target user. In some embodiments, the NEF may provide at least 3 of the user terminal address, SUPI, GPSI, DNN, and S-NSSAI to the BSF so that the BSF accurately determines the AM-PCF network element and the SM-PCF network element of the target user.
By the method, the BSF performs planning according to SUPI or GPSI of the user, so that the problem that the BSF is difficult to be allocated by the IP address due to the fact that the UE possibly has a plurality of IP addresses belonging to different subnets can be solved, and the robustness of the system is improved; the NEF network element is used for converting the IP address and SUPI or GPSI, so that the BSF registered by the AM-PCF and SM-PCF of the user is determined according to the IP address, and the improvement on the third party application service is not needed, thereby being beneficial to popularization and application; because the AM-PCF and the SM-PCF of the same user are registered to the same BSF, the AM-PCF and the SM-PCF can be synchronously determined after the BSF is determined, and the determining efficiency of the PCF is improved.
In some embodiments, the session management method of the present disclosure further includes a flow as shown in fig. 2 before performing the session management method of the present disclosure as shown in the embodiment of fig. 1.
In step 210, during the process of establishing or modifying the AM policy, the AMF network element obtains, from the AM-PCF network element, an identity of the BSF network element to which the AM-PCF network element is registered. In some embodiments, the identity of the BSF network element may be sent to the AMF by the AM-PCF network element after registration is completed.
In step 220, during the process of establishing or modifying the user session, the SMF network element indicates, according to the identifier of the BSF network element to which the AM-PCF network element is registered provided by the AMF network element, the SM-PCF network element to register to the BSF network element corresponding to the identifier of the BSF network element. In some embodiments, when a user initiates or modifies a session, the AMF network element is triggered to initiate session creation or modification to the SMF network element, and the identity of the BSF network element is sent to the SMF network element.
Through the method, through the process of establishing or modifying the AM strategy, the AMF can obtain the identification of the BSF registered by the AM-PCF, so that no additional inquiry is needed in the subsequent session modification or establishment process, the signaling waste is further reduced, and the session establishment efficiency is improved.
A flow chart of still further embodiments of the session management method of the present disclosure is shown in fig. 3.
In step 311, the AM policy is established or modified by the interaction between the AMF and the AM-PCF, and the AM-PCF registers binding information of the AM-PCF and the user terminal with the BSF, and registers the identity of the BSF network element to which the AM-PCF is registered.
In step 312, the AM-PCF network element feeds back the identity of the BSF network element to the AMF network element.
In some embodiments, the AM-PCF network element may modify the AM policy control response message to send the AM policy control response carrying the identity of the BSF network element to the AMF network element.
In step 321, during the user session establishment/modification procedure, the AMF network element carries the identity of the BSF network element when initiating session establishment or modification to the SMF network element.
In some embodiments, the user context setup request sent by the AMF to the SMF may be modified, where the user context setup request carries the identity of the BSF network element.
In step 322, the SMF network element sends the identity of the BSF network element to the SM-PCF network element.
In some embodiments, the SM policy control setup request may be modified, and the SMF network element sends the SM-PCF network element with the identifier of the BSF network element through the SM policy control setup request.
In step 323, the SMF-PCF network element registers with the corresponding BSF network element according to the identity of the BSF network element. In some embodiments, the SMF-PCF network element may provide the BSF with the UE' S IP address, SUPI, etc., and may also provide PDU session identification, DNN, S-NSSAI, and RAT Type (Radio Access Technology Type ), etc.
By the method, in the registration and session establishment or modification flow in the related technology, based on the existing signaling, the identification of the BSF network element is increased and the BSF network element is transferred to the AMF and the SMF, and when the SM policy association is established, PCF only registers with the BSF provided by the SMF, so that the registration and discovery of all PCFs of the UE are served by a single BSF. The method disclosed by the invention has small influence on the current network element, signaling and flow, does not increase additional signaling, further improves the effective utilization of network resources, reduces the network element load, and is beneficial to the implementation and popularization and application of the scheme in the ground.
In some embodiments, the SM-PCF may also obtain by querying the UDR (Unified Data Repository, unified data store) in addition to determining the BSF network element to register to through the identity of the BSF network element provided by the AMF to the SMF. In some embodiments, the AM-PCF network element may store the identity of the BSF network element in the UDR and associate with the target user after registering with the BSF network element. In some embodiments, the AM-PCF network element may directly store the identity of the BSF network element in the UDR, or may provide the identity of the BSF network element to the AMF, and the AMF performs the operation of storing in the UDR. In some embodiments, the SM-PCF may directly query the UDR for the identifier of the BSF network element associated with the target user, or after the SMF performs the operation of querying the UDR for the identifier of the BSF network element associated with the target user, the identifier of the BSF network element is forwarded to the SM-PCF, so that the SM-PCF registers with the corresponding BSF network element.
By the method, another way for facilitating the SM-PCF to acquire the identification of the BSF network element is provided, and the reliability is improved; reducing the burden of message delivery; the reliability of information storage is improved through data backup of the UDR, the AMF does not need to record the identification information of the BSF network element for a long time, and the information recording load of the AMF is reduced.
A schematic diagram of some embodiments of the session management system of the present disclosure is shown in fig. 4.
The AM-PCF network element 401 can send an SM-PCF network element query request for the session of the target user to the BSF network element registered to itself, and after receiving feedback information of the BSF network element 402, interact with the SM-PCF network element according to the feedback information. In some embodiments, the feedback information includes a communication address or an identifier of the SM-PCF network element of the target user, so that the AM-PCF can determine how to establish a signal connection with the SM-PCF network element.
The BSF network element 402 can determine the SM-PCF network element serving the target user according to the registration information, and feed back to the AM-PCF network element.
The SM-PCF network element 403 registers with the same BSF network element as the AM-PCF network element serving the same user.
In the session management system, the AM-PCF network element can directly initiate a request for searching the SM-PCF network element to the BSF network element, and can successfully obtain feedback, so that the step of searching the SM-PCF network element by the AM-PCF network element is reduced, the searching time is shortened, and the interaction efficiency of the SM-PCF network element and the AM-PCF network element is improved; in addition, the AM-PCF network element only needs to send a query request to one BSF network element, and does not need to send the query request to each network element in the BSF set, so that the signaling waste is reduced.
In some embodiments, as shown in fig. 4, the session management system may further include a NEF network element 406 capable of receiving PCF query information for the target user, where the PCF query information may include an IP address of the target user. The NEF network element 406 determines the SUPI or GPSI of the target user according to the acquired IP address. In some embodiments, the NEF network element determines the SUPI or GPSI of the user according to the pre-stored correspondence between the IP address and the SUPI or GPSI of the user. According to allocation strategy of BSF for SUPI or GPSI, NEF network element determines AM-PCF network element of target user and BSF network element registered by SM-PCF network element, and sends PCF query request of user to corresponding BSF. The BSF network element determines an AM-PCF network element and an SM-PCF network element serving the target user based on the registration information and a user identification from the NEF, such as SUPI or GPSI of the target user. In some embodiments, the NEF may provide at least 3 of the user terminal address, SUPI, GPSI, DNN, and S-NSSAI to the BSF so that the BSF accurately determines the AM-PCF network element and the SM-PCF network element of the target user.
In such a system, the BSF performs planning according to SUPI or GPSI of the user, so that the problem that the BSF is difficult to be allocated by the IP address due to the fact that the UE possibly has a plurality of IP addresses belonging to different subnets can be solved, and the robustness of the system is improved; the NEF network element is used for converting the IP address and SUPI or GPSI, so that the BSF registered by the AM-PCF and SM-PCF of the user is determined according to the IP address, and the improvement on the third party application service is not needed, thereby being beneficial to popularization and application; because the AM-PCF and the SM-PCF of the same user are registered to the same BSF, the AM-PCF and the SM-PCF can be synchronously determined after the BSF is determined, and the determining efficiency of the PCF is improved.
In some embodiments, as shown in fig. 4, the session management system further includes an SMF network element 405, where in the process of establishing or modifying the user session, the SM-PCF network element can be indicated to be registered to a BSF network element corresponding to the identifier of the BSF network element according to the identifier of the BSF network element to which the AM-PCF network element is registered provided by the AMF network element. In some embodiments, the SMF network element 405 may send the identity of the BSF network element to the SM-PCF network element 403, for example by means of an SM policy control setup request. The SMF-PCF network element 403 registers to the corresponding BSF network element according to the identity of the BSF network element.
The session management system can control the AM-PCF network element and the SM-PCF network element to register to the same BSF network element in the process of initiating a session by a user terminal and then establishing or modifying the user session, thereby ensuring that the AM-PCF network element and the SM-PCF network element are always registered to the same BSF network element in the whole session persistence process, and further the steps shown in the figure 1 can be successful in the subsequent execution, and the reliability of SM-PCF searching is improved.
In some embodiments, as shown in fig. 4, the session management system further includes an AMF network element 404 capable of carrying an identification of the BSF network element when session creation or modification is initiated to the SMF network element. In some embodiments, the AM-PCF network element 401 may register to the BSF network element when establishing or modifying the AM policy with the AMF, further obtain the identifier of the registered BSF network element, and feed back the identifier of the BSF network element to the AMF network element, so that the AMF network element 404 has the identifier of the BSF network element after the AM policy is established or modified. When triggering user session establishment/modification, the AMF network element 404 carries the identity of the BSF network element in a user context establishment request sent to the SMF network element 405.
The session management system can enable the AMF to obtain the identification of the BSF registered by the AM-PCF through the process of establishing or modifying the AM policy, so that no additional inquiry is needed in the subsequent session modification or establishment process, signaling waste is further reduced, and session establishment efficiency is improved.
A schematic diagram of some embodiments of interaction flows of the session management system of the present disclosure is shown in fig. 5, and a signaling flow after 505 in this embodiment is exemplified by a session establishment procedure.
In 501, the user terminal is successfully registered in the AMF 52 by the base station eNB 51.
In 502, AMF 52 sends an AM policy control creation instruction to AM-PCF 53.
In 503, the AMF52 selects one BSF 56 and initiates registration therewith. In some embodiments, the selection of the BSF 56 may be based on logic in the related art.
In 504, when the AM-PCF53 sends an AM policy control setup request reply to the AMF52, the BSF ID of the BSF 56 to which the AM-PCF53 is registered is appended.
In 505, the user terminal initiates a session establishment request to the AMF 52 through the eNB 51.
When the AMF52 sends PDU session establishment context information to the SMF 54, the identity of the BSF ID network element provided by the AM-PCF53 is carried 506.
In 507, when the SMF 54 sends an SM policy control setup request to the SM-PCF55, the BSF ID from the AMF53 is carried.
In 508, when the SM-PCF55 is to select the BSF to register with, the BSF network element corresponding to the received BSF ID, i.e., the BSF 56, is selected, thereby implementing registration with the same BSF network element as the AM-PCF 53.
In 509 and 510, the SM-PCF 55 feeds back an SM policy control creation response to the SMF54, and the AMF 52 feeds back the session establishment success through the eNB 51, according to the procedure in the related art.
In 511, the BSF 56 to which the AM-PCF 53 and the SM-PCF 55 register is responsible for maintaining the AM-PCF of the UE, as well as registration binding information of all SM-PCFs. When the subsequent AM-PCF needs to search for the SM-PCF of the appointed session, only the registered BSF needs to be searched.
The session management system improves the discovery process of the AM-PCF network element to the SM-PCF network element from AM-PCF to NRF and then from AM-PCF to BSF to one-step discovery of the AM-PCF to BSF, simplifies the discovery process and improves the interaction efficiency of the AM-PCF network element and the SM-PCF network element; in addition, the AM-PCF network element inquires all BSFs in the BSF set, and the method is improved to send discovery requests to a single BSF, so that the signaling waste is reduced, and the effective utilization of network resources is facilitated.
In some embodiments, after the AM-PCF network element 401 registers with the BSF network element 402, the identity of the BSF network element may also be directly stored in the UDR and associated with the target user, or the identity of the BSF network element may be provided to the AMF network element 404, and the AMF network element 404 performs the operation of storing in the UDR. The SM-PCF 403 may directly query UDR for the identifier of the BSF network element associated with the target user, or after the SMF network element 405 performs the operation of querying UDR for the identifier of the BSF network element associated with the target user, forward the identifier of the BSF network element to the SM-PCF, so that the SM-PCF registers with the corresponding BSF network element.
In some embodiments, if the AM-PCF network element 401 provides the identity of the BSF network element to the AMF network element 404, the AMF network element 404 is further capable of storing the identity of the BSF network element in the UDR and associating with the target user.
In some embodiments, if the SM-PCF 403 obtains the identity of the BSF network element through the SMF network element 405, the SMF network element 405 can query the UDR for the identity of the BSF network element associated with the target user, and forward the obtained identity of the BSF network element to the SM-PCF.
The system does not need to create or modify the identifier of the BSF network element carried by the message through the context, thereby reducing the burden of message transmission; the reliability of information storage is improved through data backup of the UDR, the AMF does not need to record the identification information of the BSF network element for a long time, and the information recording load of the AMF is reduced.
A schematic structural diagram of one embodiment of a session management system of the present disclosure is shown in fig. 6. Each network element in the session management system comprises a memory 601 and a processor 602. Wherein: the memory 601 may be a magnetic disk, flash memory or any other non-volatile storage medium. The memory is used for storing the instructions of the corresponding network element in the corresponding embodiment in the session management method. The processor 602 is coupled to the memory 601 and may be implemented as one or more integrated circuits, such as a microprocessor or microcontroller. The processor 602 is configured to execute instructions stored in the memory, and can improve efficiency of interaction between the AM-PCF network element and the SM-PCF network element.
In one embodiment, as also shown in FIG. 7, session management system 700 includes memory 701 and processor 702. The processor 702 is coupled to the memory 701 through a BUS 703. The session management system 700 may also be coupled to external storage 705 via a storage interface 704 for invoking external data, and may also be coupled to a network or another computer system (not shown) via a network interface 706. And will not be described in detail herein.
In this embodiment, the data instruction is stored in the memory, and then the processor processes the instruction, so that the efficiency of interaction between the AM-PCF network element and the SM-PCF network element can be improved.
In another embodiment, a computer readable storage medium has stored thereon computer program instructions which, when executed by a processor, implement the steps of the method in the corresponding embodiments of the session management method. It will be apparent to those skilled in the art that embodiments of the present disclosure may be provided as a method, apparatus, 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 computer-usable non-transitory storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable 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 flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations 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.
Thus far, the present disclosure has been described in detail. In order to avoid obscuring the concepts of the present disclosure, some details known in the art are not described. How to implement the solutions disclosed herein will be fully apparent to those skilled in the art from the above description.
The methods and apparatus of the present disclosure may be implemented in a number of ways. For example, the methods and apparatus 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.
Finally, it should be noted that: the above embodiments are merely for illustrating the technical solution of the present disclosure and are not limiting thereof; although the present disclosure has been described in detail with reference to preferred embodiments, those of ordinary skill in the art will appreciate that: modifications may be made to the specific embodiments of the disclosure or equivalents may be substituted for part of the technical features; without departing from the spirit of the technical solutions of the present disclosure, it should be covered in the scope of the technical solutions claimed in the present disclosure.

Claims (17)

1. A session management method, comprising:
the method comprises the steps that an access and mobility AM-Policy Control Function (PCF) network element sends a session management (SM-PCF) network element query request for a session of a target user to a registered Binding Support Function (BSF) network element, wherein the AM-PCF network element and the SM-PCF network element serving the same user are registered to the same BSF network element;
The BSF network element determines an SM-PCF network element serving the target user according to the registration information and feeds the SM-PCF network element back to the AM-PCF network element;
the AM-PCF network element interacts with the SM-PCF network element according to feedback information;
In the process of establishing or modifying the user session, a session management function SMF network element indicates the SM-PCF network element to register to the BSF network element corresponding to the identifier of the BSF network element according to the identifier of the BSF network element registered to the AM-PCF network element provided by an authentication management function AMF network element.
2. The method of claim 1, wherein the feedback information includes a communication address or an identification of the SM-PCF network element of the target user.
3. The method of claim 1, further comprising:
The network element of the network opening function NEF receives PCF inquiry information aiming at a target user;
The NEF network element determines a user permanent identifier SUPI or a general public user identifier GPSI of the target user according to the IP address in the PCF query information;
the NEF network element determines the AM-PCF network element of the target user and the BSF network element registered by the SM-PCF network element according to the SUPI or GPSI, and sends a user PCF query request;
And the BSF network element determines the AM-PCF network element and the SM-PCF network element serving the target user according to the registration information.
4. The method of claim 1, wherein the SMF, according to an identifier of the BSF network element to which the AM-PCF network element is registered provided by an AMF, indicates the BSF network element corresponding to the identifier of the SM-PCF network element registered to the BSF network element, includes:
The AMF network element carries the identifier of the BSF network element when initiating session creation or modification to the SMF network element;
The SMF network element sends the identification of the BSF network element to the SM-PCF network element;
and the SMF-PCF network element registers to the corresponding BSF network element according to the identifier of the BSF network element.
5. The method of claim 1, further comprising:
In the process of establishing or modifying an AM strategy, the AMF network element acquires the identification of the BSF network element registered by the AM-PCF network element from the AM-PCF network element.
6. The method of claim 5, wherein the AMF obtaining, from the AM-PCF network element, an identity of the BSF network element to which the AM-PCF network element is registered comprises:
the AM-PCF network element registers to the BSF network element, and acquires the identification of the BSF network element registered to the AM-PCF network element;
The AM-PCF network element feeds back the identification of the BSF network element to the AMF network element.
7. The method of claim 4, wherein the SMF network element sends an SM policy control setup request carrying an identification of the BSF network element to the SM-PCF network element.
8. The method of claim 6, wherein the AM-PCF network element sends an AM policy control response carrying an identification of the BSF network element to the AMF network element.
9. The method of claim 1, further comprising:
In the process of establishing or modifying an AM strategy, the AM-PCF network element or the AM-PCF network element writes the identification of the BSF network element into a unified data storage UDR through an authentication management function AMF network element; and
In the process of establishing or modifying the user session, the SM-PCF network element or the SM-PCF network element inquires the identifier of the BSF network element corresponding to the target user stored in the UDR through a session management function SMF network element, and registers to the BSF network element corresponding to the identifier of the BSF network element.
10. A session management system, comprising:
An access and mobility AM-policy control function PCF network element configured to send a session management SM-PCF network element query request for a session of a target user to a registered binding support function BSF network element, and interact with the SM-PCF network element according to feedback information of the BSF network element;
the BSF network element is configured to determine an SM-PCF network element serving the target user according to the registration information and feed back the SM-PCF network element to the AM-PCF network element; and
The SM-PCF network element is configured to register with the same BSF network element with the AM-PCF network element serving the same user;
And the session management function SMF network element is configured to instruct the SM-PCF network element to register with the BSF network element according to the identifier of the BSF network element registered with the AM-PCF network element provided by the authentication management function AMF network element in the process of establishing or modifying the user session.
11. The system of claim 10, further comprising a network open function, NEF, network element configured to:
receiving PCF inquiry information aiming at a target user;
Determining a user permanent identifier SUPI or a general public user identifier GPSI of the target user according to the IP address in the PCF query information; and
Determining the AM-PCF network element of the target user and the BSF network element registered by the SM-PCF network element according to the SUPI or GPSI, and sending a user PCF query request;
The BSF network element is further configured to determine the AM-PCF network element and the SM-PCF network element serving the target user based on registration information.
12. The system of claim 10, further comprising the AMF network element configured to carry an identification of the BSF network element upon initiating session creation or modification to the SMF network element;
The SMF network element is configured to send the identification of the BSF network element to the SM-PCF network element;
The SMF-PCF network element is further configured to register with the corresponding BSF network element according to the identity of the BSF network element.
13. The system of claim 12, further comprising:
The AMF network element is further configured to obtain, from the AM-PCF network element, an identity of the BSF network element to which the AM-PCF network element is registered in a process of establishing or modifying an AM policy.
14. The system of claim 13, wherein,
The AM-PCF network element is further configured to register to the BSF network element, acquire the identifier of the BSF network element registered to the BSF network element, and feed back the identifier of the BSF network element to the AMF network element.
15. The system of claim 10, wherein the AM-PCF network element is further configured to: in the process of establishing or modifying an AM strategy, writing the identification of the BSF network element into a unified data storage (UDR), or providing the identification of the BSF network element for an Authentication Management Function (AMF) network element so that the AMF network element writes the identification of the BSF network element into the UDR;
The SM-PCF network element is further configured to: inquiring the identification of the BSF network element corresponding to the target user stored in the UDR or acquiring the identification of the BSF network element corresponding to the target user, which is inquired and acquired by a session management function SMF network element from the UDR, in the process of establishing or modifying the user session; registering the BSF network element corresponding to the identifier of the BSF network element.
16. A session management system, comprising:
A memory; and
A processor coupled to the memory, the processor configured to perform the method of any of claims 1-9 based on instructions stored in the memory.
17. A computer readable storage medium having stored thereon computer program instructions which, when executed by a processor, implement the steps of the method of any of claims 1 to 9.
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