WO2022028051A1

WO2022028051A1 - Session control method, apparatus, system, network element, and medium

Info

Publication number: WO2022028051A1
Application number: PCT/CN2021/095925
Authority: WO
Inventors: 夏勇; 刘建华
Original assignee: 中兴通讯股份有限公司
Priority date: 2020-08-06
Filing date: 2021-05-26
Publication date: 2022-02-10
Also published as: CN114095551A

Abstract

A session management method, applied to a session management function (SMF), and comprising: receiving a first session update request sent by an intermediate SMF (I-SMF), the first session update request carrying decision information of the I-SMF; generating a second session update request according to the decision information of the I-SMF; and sending the second session update request to a packet data unit (PDU) session anchor (PSA), the second session update request being used for instructing the PSA to execute the decision information of the I-SMF.

Description

Session control method, device, system, network element and medium

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is based on the Chinese patent application with the application number of 202010785439.5 and the filing date of August 6, 2020, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is incorporated herein by reference.

technical field

The embodiments of the present application relate to, but are not limited to, the field of communications technologies, and in particular, relate to a session management method, apparatus, system, network element, and medium.

Background technique

In the fifth generation mobile communication system (5th-Generation, 5G), the session management function (Session Management Function, SMF) is used to manage the user's packet data unit session (Packet Data Unit, PDU), as the user plane function (User Plane Function, SMF). , UPF) to formulate packet detection and forwarding rules, etc. The protocol released by the 3rd Generation Partnership Project (3GPP) specifies the local offloading process of the Intermediate Session Management Function (I-SMF).

In the I-SMF offloading scenario of the intermediate session management function, the Uplink Classifier (UL CL) or the Branching Point (Branching Point, BP) acts as the Intermediate User Plane Function (I-UPF), when the user equipment When the (User Equipment, UE) moves, a new intermediate user plane function I-UPF will be established. In order to keep the data of the user equipment UE unblocked during the moving process, when the intermediate user plane function I-UPF changes, the new and old intermediate user plane functions I-UPF exist at the same time, and the session management function SMF needs to control the uplink classifier ULCL or The branch point BP adds new rules, resulting in high complexity and low operation efficiency of the diversion scenario.

SUMMARY OF THE INVENTION

The following is an overview of the topics detailed in this article. This summary is not intended to limit the scope of protection of the claims.

Embodiments of the present application provide a session control method, apparatus, system, network element, and storage medium.

In a first aspect, an embodiment of the present application provides a session management method, which is applied to a session management function SMF, including: receiving a first session update request sent by an intermediate session management function I-SMF, where the first session update request carries decision information of the intermediate session management function I-SMF; generating a second session update request according to the decision information of the intermediate session management function I-SMF; sending the second session update request to the local packet data unit PDU session anchor PSA, the second session update request is used to instruct the packet data unit PDU session anchor PSA to execute decision information of the session management function I-SMF.

In a second aspect, an embodiment of the present application provides a session management method, which is applied to an intermediate session management function I-SMF, including: sending a first session update request to the session management function SMF, where the first session update request carries all the decision information of the intermediate session management function I-SMF; receive the second session update request sent by the session management function SMF; generate first control information according to the second session update request; send the first control information to the uplink Classifier ULCL or branch point BP.

In a third aspect, an embodiment of the present application provides a session management system, including: a session management function SMF and an intermediate session management function I-SMF, where the intermediate session management function I-SMF sends a session update request to the session management function SMF; the session management function SMF generates a second session update request according to the decision information of the intermediate session management function I-SMF; the session management function SMF sends the second session update request to the packet data unit PDU session anchor PSA; the intermediate session management function I-SMF sends the first control information to the uplink classifier ULCL or the branch point BP.

In a fourth aspect, an embodiment of the present application provides a session control apparatus, including: a request receiving module, where the request receiving module is configured to receive a first session update request sent by an intermediate session management function I-SMF, the first session update request The session update request carries the decision information of the intermediate session management function I-SMF; the request generation module is configured to generate a second session update request according to the decision information of the intermediate session management function I-SMF; A request to send module, the request to send module configured to send the second session update request to a packet data unit PDU session anchor PSA.

In a fifth aspect, an embodiment of the present application provides a session control apparatus, including: a request sending module, where the request sending module is configured to send a first session update request to a session management function SMF, where the first session update request contains Carrying decision information of the intermediate session management function I-SMF; a request receiving module, the request receiving module is configured to receive a second session update request sent by the session management function SMF; a control module, the control module is configured to The second session update request generates first control information, and sends the first control information to the uplink classifier ULCL or the branch point BP.

In a sixth aspect, an embodiment of the present application provides a network element, including: a memory, a processor, and a program stored on the memory and executable on the processor; when the program is executed by the processor , to implement the session management method described in the first aspect; or, the session management method described in the second aspect.

In a seventh aspect, an embodiment of the present application provides a computer-readable storage medium for computer-readable storage, where the storage medium stores one or more programs, and the one or more programs can be stored by one or more The processor executes to implement the session management method according to the first aspect; or, the session management method according to the second aspect.

Other features and advantages of the present application will be set forth in the description which follows, and, in part, will be apparent from the description, or may be learned by practice of the present application. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the description, claims and drawings.

Description of drawings

1 is a schematic diagram of a local offloading architecture of an intermediate session management function I-SMF provided by an embodiment of the present application;

2 is a schematic flowchart of a session management method provided by an embodiment of the present application;

3 is a schematic flowchart of a session management method provided by another embodiment of the present application;

FIG. 4 is a schematic flowchart of a session management method provided by another embodiment of the present application.

detailed description

In order to make the purpose, technical solutions and advantages of the present application more clearly understood, the present application will be described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application.

It should be noted that although the functional modules are divided in the schematic diagram of the device, and the logical sequence is shown in the flowchart, in some cases, the modules may be divided differently from the device, or executed in the order in the flowchart. steps shown or described. The terms "first", "second" and the like in the description and claims and the above drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

Protocols 23.502 and 29.244 of the 3rd Generation Partnership Project 3GPP have relevant provisions on the process of the intermediate session management function I-SMF in the local offload scenario. According to the protocol, the intermediate session management function I-SMF only manages the uplink and downlink rules of the uplink classifier ULCL or the branch point BP and the packet data unit session anchor point PSA1 path. In the case of the intermediate session management function I-SMF offloading, the rules for the path between the uplink classifier ULCL or the branch point BP and the local packet data unit session anchor point PSA2 are mainly managed by the home session management function SMF, and the local packet data unit session anchor point The packet filtering control protocol PFCP in PSA2 and the uplink classifier ULCL or branch point BP are all sent by the home session management function SMF through the N16a interface to send the N4 rule signaling to the intermediate session management function I-SMF, and then the intermediate session management function I-SMF. SMF is sent after adding localization parameters.

When the intermediate user plane function I-UPF is changed, in order to prevent the data of the moving user equipment UE from being lost, it is necessary to maintain the two intermediate user plane functions I-UPF at the same time, and perform data transmission at the same time until the intermediate user plane function. The function I-UPF change process is completed and the old intermediate user plane function I-UPF is removed. Since the change process is in a local offloading scenario, operations such as insertion, deletion and change of the session anchor point PSA2 of the local packet data unit need to be performed during the change process. The session management function SMF needs to use the application uplink classifier ULCL or branch point BP to The packet filtering control protocol PFCP of the local packet data unit session anchor PSA2 performs synchronous insertion, deletion and modification operations. At the same time, the session management function SMF also needs to take into account the new and old two intermediate user plane functions I-UPF. In this process, the intermediate session management function I-SMF needs to connect the external network, the new and old intermediate user plane functions I-UPF, the local packet data unit session anchor PSA2 with the home packet data unit session anchor PSA1, including For the addition, deletion and update of upstream and downstream rules. Therefore, when the intermediate session management function I-SMF generates a new intermediate user plane function I-UPF due to the user equipment UE, it cannot be processed separately, and all the rules of the session management function SMF need to be stored, resulting in complexity in the offloading scenario High, the intermediate session management function I-SMF and the session management function SMF operate with low efficiency.

The technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are part of the embodiments of the present application, but not all of the embodiments.

FIG. 1 is a schematic diagram of a local offloading architecture of an intermediate session management function I-SMF provided by an embodiment of the present application. As shown in Figure 1, when the user equipment UE moves and is in local offload, because the original session management function SMF and user plane function UPF cannot serve the new area, it is necessary to insert the intermediate session management function I-SMF and uplink Classifier ULCL or branch point BP to conduct the session. The uplink classifier ULCL is used for the uplink classification of the IPv4 network, and the branch point BP is the branch point of the IPv6. In this case, there will be two packet data unit session anchors PSA in the system, marked as PSA1 and PSA2, where PSA1 is the user plane function UPF selected when the user equipment UE requests to establish a packet data unit PDU session, and PSA2 is a user plane function UPF that implements local offloading of service data flows. PSA1 and PSA2 are respectively connected to an external data network (Data Network, DN) to realize network connection. The access management function (Access Management Function, AMF) is respectively connected to the access network (Access Network, AN), the user equipment UE and the intermediate session management function I-SMF. In Figure 1, the session management function SMF and the home packet data unit PDU session anchor PSA1 establish a Packet Filter Control Protocol (PFCP) session, and directly control the home packet data unit session anchor PSA1; intermediate session management The function I-SMF establishes a packet filter control protocol PFCP session with the upstream classifier ULCL or the branch point BP and the local packet data unit session anchor PSA2 respectively. Controls the upstream classifier ULCL or branch point BP and the local packet data unit session anchor point PSA2.

An embodiment of the present application provides a session control method, which is applied to a session management function SMF, including: receiving a first session update request sent by an intermediate session management function I-SMF, where the first session update request carries the intermediate session management function I-SMF -SMF decision information; generate a second session update request according to the decision information of the intermediate session management function I-SMF; send the second session update request to the packet data unit PDU session anchor PSA, the second session update request is used to indicate the packet data The unit PDU Session Anchor PSA performs decision information for the session management function I-SMF.

In some embodiments, the decision information of the session management function I-SMF includes at least one of the following: inserting the packet data unit PDU session anchor point PSA; deleting the packet data unit PDU session anchor point PSA; changing the packet data unit PDU session anchor point PSA .

In some embodiments, the session management function SMF performs at least one of the following operations on the packet data unit PDU session anchor point PSA according to the decision information of the intermediate session management function I-SMF: inserting the packet data unit PDU session anchor point PSA; deleting the packet data Unit PDU Session Anchor PSA; Change Packet Data Unit PDU Session Anchor PSA.

An embodiment of the present application provides a session control method, which is applied to an intermediate session management function I-SMF, including: sending a first session update request to the session management function SMF, where the first session update request carries the intermediate session management function I-SMF Decision information of the SMF; receive a second session update request sent by the session management function SMF; generate first control information according to the second session update request; send the first control information to the uplink classifier ULCL or the branch point BP.

In some embodiments, the first control information is used to update the N4 rule message within the uplink classifier ULCL or branch point BP.

In some embodiments, the session control method further comprises: sending a second control message to the packet data unit PDU session anchor point PSA, the second control message is used to update the packet data unit PDU session anchor point PSA with the uplink classifier ULCL or branch Click the N4 rule message corresponding to BP.

In some embodiments, the first control information is delivered using the N4 rule.

In some embodiments, a functional differentiation of the intermediate session management function I-SMF and the session management function SMF is achieved using a session control method. The intermediate session management function I-SMF controls the uplink classifier ULCL or branch point BP and the packet data unit session anchor PSA respectively through two packet filtering control protocol PFCP sessions; Insertion, deletion or update of PDU Session Anchor PSA.

FIG. 2 is a schematic flowchart of a session management method provided by an embodiment of the present application. The session management method shown in FIG. 2 includes at least the following steps: step S101, step S102, step S103, step S104, step S105, step S106, step S107, step S108, step S109, step S110 and step S111.

Step S101: The UE has established a PDU connection with the PSA1 and the intermediate session management function I-SMF.

In some embodiments, the user equipment UE has established a packet data unit PDU connection with the home packet data unit session anchor PSA1 and the intermediate session management function I-SMF, and has no local packet data unit session anchor PSA1.

Step S102: the intermediate session management function I-SMF establishes PSA2.

In some embodiments, due to the user equipment UE, the intermediate session management function I-SMF discovers that the traffic can be locally offloaded to the local packet data unit session anchor PSA2 and establishes the local packet data unit session anchor PSA2.

Step S103: The intermediate session management function I-SMF establishes a ULCL or BP.

In some embodiments, the intermediate session management function I-SMF makes a decision to decide whether to establish and select a new user plane function UPF as the uplink classifier ULCL or branch point BP, and if it chooses to establish, establish the uplink classifier ULCL or branch point BP, otherwise still use the existing intermediate user plane function I-UPF as the uplink classifier ULCL or branch point BP.

Step S104: the intermediate session management function I-SMF initiates a session update request.

In some embodiments, the intermediate session management function I-SMF initiates a session update request through the N16a port, and notifies the SMF of the information of the newly created local packet data unit session anchor PSA2, and the uplink classifier ULCL or branch point BP information does not need to be notified to the SMF, and the SMF response.

Step S105: SMF updates the downstream direction of PSA1.

In some embodiments, if the upstream classifier ULCL or branch point BP is the newly selected UPF, the SMF updates the PSA1 downstream redirection.

Step S106: The session management function SMF initiates a session update request.

In some embodiments, the SMF initiates a session update request through the N16a port, and only issues the N4 rule to the local packet data unit session anchor local packet data unit session anchor PSA2, that is, the N4 rule session request, the upstream PDR filter condition in the rule Identifying conditions for offloading services.

Step S107: The intermediate session management function I-SMF updates PSA2.

In some embodiments, the intermediate session management function I-SMF uses the N4 rule issued by the SMF to the local packet data unit session anchor PSA2 in step S106, supplements some local parameters of the local packet data unit session anchor PSA2, and passes the N4 rule The interface is delivered and installed to the local packet data unit session anchor PSA2.

Step S108: The intermediate session management function I-SMF updates the N4 rules of the ULCL or BP.

In some embodiments, the intermediate session management function I-SMF updates the upstream classifier ULCL or the N4 rule on the branch point BP according to the acquired information, and establishes upstream diversion rules for the local offload service of the local packet data unit session anchor PSA2, Downstream forwarding rules, if the upstream classifier ULCL or the branch point BP is newly selected, the upstream classifier ULCL or the branch point BP should also install the diversion rules including other local PSAs that have existed before, and use the external priority Determines the priority of the upstream classifier ULCL or branch point BP for the traffic diversion rule of the newly added local packet data unit session anchor point PSA2.

Step S109: the intermediate session management function I-SMF responds to the SMF.

In some embodiments, the intermediate session management function I-SMF responds to the session update request initiated by the SMF in step S106, and the content includes the response of the SMF to the N4 rule session establishment request issued by the local packet data unit session anchor PSA2 in step S106, here The response to the N4 rule session request including the uplink classifier ULCL or the branch point BP is no longer required, because the SMF does not issue an N4 rule session request to the uplink classifier ULCL or the branch point BP in step S106.

Step S110: The intermediate session management function I-SMF updates the tunnel information of the ULCL or BP.

In some embodiments, the intermediate session management function I-SMF updates the front-end tunnel information about the new uplink classifier ULCL or branch point BP. In the case of switching from IPv6 to IPv4, the SMF informs the UE of the IPV6 prefix of the local packet data unit session anchor PSA2.

Step S111: the intermediate session management function I-SMF releases the I-UPF.

In some embodiments, the intermediate session management function I-SMF releases the intermediate user plane function I-UPF.

FIG. 3 is a schematic flowchart of a session management method provided by another embodiment of the present application. The session management method shown in FIG. 3 at least includes the following steps: step S201, step S202, step S203, step S204, step S205, step S206, step S207, step S207b and step S208.

Step S201: The UE has established a connection with PSA1, PSA2, ULCL or BP.

In some embodiments, the user equipment UE has established a connection with the home packet data unit session anchor PSA1, the local packet data unit session anchor PSA2, the ULCL or the BP.

Step S202: the intermediate session management function I-SMF creates a new I-UPF.

In some embodiments, the intermediate session management function I-SMF decides to delete the local offload anchor PSA2 due to user movement. The intermediate session management function I-SMF can also choose to create a new intermediate user plane function I-UPF to replace the existing uplink classifier ULCL or branch point BP.

Step S203: the intermediate session management function I-SMF initiates a session update request.

In some embodiments, the intermediate session management function I-SMF initiates a session update request through the N16a port, instructing the local packet data unit session anchor PSA2 to delete, and optionally carries the downlink tunnel information of the new intermediate user plane function I-UPF, No indication is required for the deletion of the uplink classifier ULCL or branch point BP. SMF responds to session update requests.

Step S204: SMF updates the downstream direction of PSA1.

In some embodiments, the session management function SMF updates the PSA1 downlink information to the new intermediate user plane function I-UPF.

Step S205: The SMF notifies the UE to stop using the IPv6 prefix of PSA2.

In some embodiments, in the case of switching from IPv6 to IPv4, the session management function SMF informs the user equipment UE to stop using the PV6 prefix of the local packet data unit session anchor PSA2.

Step S206: Obtain the session update request of the SMF.

In some embodiments, the session management function SMF initiates a session update request through the N16a port, and only delivers the N4 rule release message for deleting the local packet data unit session anchor PSA2, and does not deliver updates involving the uplink classifier ULCL or branch point BP, Delete N4 rule message.

Step S207: the intermediate session management function I-SMF makes a decision.

In some embodiments, the intermediate session management function I-SMF decides how to operate the uplink classifier ULCL or branch point BP based on the information at hand. If the intermediate user plane function I-UPF is newly added, the old uplink classifier ULCL or branch point BP needs to be deleted, and other local traffic distribution and diversion rules are installed on the newly added intermediate user plane function I-UPF. If the intermediate user plane function I-UPF is not newly added, the rules in the uplink classifier ULCL or the branch point BP need to be updated, and the rules for diverting the local packet data unit session anchor point PSA2 are deleted.

Step S207b: The intermediate session management function I-SMF delivers a PSA2 delete message.

In some embodiments, the intermediate session management function I-SMF deletes the local packet data unit session anchor PSA2 using the N4 rule release message sent by the session management function SMF to the local packet data unit session anchor PSA2 in step S206.

Step S208: The intermediate session management function I-SMF responds to the session update request of the SMF.

In some embodiments, the intermediate session management function I-SMF responds to the session update request initiated by the session management function SMF in step S206, including the N4 rule deletion response of the local packet data unit session anchor PSA2.

FIG. 4 is a schematic flowchart of a session management method provided by another embodiment of the present application. The session management method shown in FIG. 4 at least includes the following steps: step S301, step S302, step S303, step S304, step S305, step S306, step S307, step S308, step S309 and step S310.

Step S301: The UE has established a connection with PSA0, PSA1, ULCL or BP.

In some embodiments, the user equipment UE has established a connection with PSA0, PSA1, ULCL or BP.

Step S302: The intermediate session management function I-SMF decides to add PSA2.

In some embodiments, due to user movement, the intermediate session management function I-SMF decides to add a local offload anchor and delete an existing local offload anchor PSA0. Therefore, the intermediate session management function I-SMF selects the local packet data unit session anchor point PSA2 as a new anchor point, and establishes a session with the local packet data unit session anchor point PSA2 through the N4 rule.

Step S303: the intermediate session management function I-SMF initiates a session update request.

In some embodiments, the intermediate session management function I-SMF initiates a session update request through the N16a port, indicating that PSA0 needs to be deleted and the local packet data unit session anchor PSA2 needs to be added, without uplink classifier ULCL or branch point BP related information.

Step S304: The SMF responds to the session update request of the intermediate session management function I-SMF.

In some embodiments, the session management function SMF responds to the session update request. The session management function SMF notifies the Packet Control Function (PCF) about the allocation and release of the IP address of the user equipment UE, and initiates an early notification to the Application Function (AF).

Step S305: The SMF initiates a session update request.

In some embodiments, the session management function SMF initiates a session update request through the N16a port, and sends an N4 rule release message for deleting PSA0 and a new N4 rule establishment message for adding PSA2, which does not involve the uplink classifier ULCL or branch point BP. N4 rule message.

Step S306: the intermediate session management function I-SMF updates PSA2.

In some embodiments, the intermediate session management function I-SMF installs the local packet data unit session anchor PSA2 with the N4 rule message delivered in step S305 to the local packet data unit session anchor PSA2 that needs to be added.

Step S307: the intermediate session management function I-SMF updates the UPF.

In some embodiments, the intermediate session management function I-SMF updates the uplink classifier ULCL or the branch point BP according to the information at hand. On the upstream classifier ULCL or branch point BP, delete the rule of the local offload anchor point PSA0, and add the rule of the local packet data unit session anchor point PSA2. The priority of the traffic diversion rule PDR of the newly added local packet data unit session anchor PSA2 is determined by the external priority of the upstream PDR of the offload service delivered by the session management function SMF to the local packet data unit session anchor PSA2.

Step S308: The intermediate session management function I-SMF releases PSA0.

In some embodiments, the intermediate session management function I-SMF releases the local offload anchor PSA0 session using the N4 rule message delivered to the local offload anchor PSA0 in step S305.

Step S309: the intermediate session management function I-SMF responds to the session update request initiated by the SMF.

In some embodiments, the intermediate session management function I-SMF responds to the session update request initiated by the session management function SMF in step S305, including the N4 rule deletion response of PSA0 and the N4 rule creation response of the local packet data unit session anchor PSA2. In some embodiments, the Local Packet Data Unit Session Anchor Point PSA is changed in an Intermediate Session Management Function I-SMF scenario.

An embodiment of the present application provides a session management system, including: a session management function SMF and an intermediate session management function I-SMF, the intermediate session management function I-SMF sends a session update request to the session management function SMF; the session management function SMF according to The decision information of the session management function I-SMF generates a second session update request; the session management function SMF sends the second session update request to the packet data unit session anchor PSA; the intermediate session management function I-SMF sends the first control information to the uplink classification ULCL or branch point BP.

An embodiment of the present application provides a session control apparatus, including: a request receiving module, where the request receiving module is configured to receive a first session update request sent by an intermediate session management function I-SMF, where the first session update request carries an intermediate session the decision information of the management function I-SMF; the request generation module, the request generation module is configured to generate a second session update request according to the decision information of the intermediate session management function I-SMF; the request sending module, the request sending module is configured to send the second session update request Session Update Request to Packet Data Unit PDU Session Anchor PSA.

An embodiment of the present application provides a session control apparatus, including: a request sending module, where the request sending module is configured to send a first session update request to a session management function SMF, where the first session update request carries an intermediate session management function I- Decision information of the SMF; a request receiving module, which is configured to receive a second session update request sent by the session management function SMF; a control module, which is configured to generate the first control information according to the second session update request, and send the second session update request. A control message to the uplink classifier ULCL or branch point BP.

An embodiment of the present application provides a network element, including: a memory, a processor, and a program stored in the memory and running on the processor; when the program is executed by the processor, the above session control method is implemented.

An embodiment of the present application further provides a computer-readable storage medium for computer-readable storage, where the storage medium stores one or more programs, and the one or more programs can be executed by one or more processors to execute the above-mentioned session control method.

The embodiments of the present application provide a session control method, device, system, network element and storage medium, which can effectively reduce the complexity in a traffic offload scenario, simplify the process of the intermediate session management function I-SMF and the session management function SMF, and improve the operation efficient.

Based on the offload scenario, the embodiments of the present application re-divide the functions of the session management function SMF and the intermediate session management function I-SMF, thereby simplifying the processing flow of the session management function SMF and the intermediate session management function I-SMF in the offload scenario. , which simplifies the process of offloading scenarios and improves the running efficiency of offloading scenarios.

Those of ordinary skill in the art can understand that all or some of the steps and systems in the methods disclosed above can be implemented as software, firmware, hardware, and appropriate combinations thereof. Some or all physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit . Such software may be distributed on computer-readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). As is known to those of ordinary skill in the art, the term computer storage media includes both volatile and nonvolatile implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data flexible, removable and non-removable media. Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disk (DVD) or other optical disk storage, magnetic cartridges, magnetic tape, magnetic disk storage or other magnetic storage devices, or may Any other medium used to store desired information and which can be accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and can include any information delivery media, as is well known to those of ordinary skill in the art .

The above is a specific description of some implementations of the application, but the application is not limited to the above-mentioned embodiments. Those skilled in the art can make various equivalent modifications or replacements without departing from the scope of the application. These equivalents Variations or substitutions of the above are all included within the scope defined by the claims of the present application.

Claims

A session control method, applied to a session management function SMF, includes:

receiving a first session update request sent by an intermediate session management function I-SMF, where the first session update request carries decision information of the intermediate session management function I-SMF;

generating a second session update request according to the decision information of the intermediate session management function I-SMF;

Sending the second session update request to the packet data unit PDU session anchor point PSA, the second session update request is used to instruct the packet data unit PDU session anchor point PSA to execute the decision information of the session management function I-SMF .
The session control method according to claim 1, wherein the decision information of the session management function I-SMF includes at least one of the following:

inserting the Packet Data Unit PDU Session Anchor PSA;

delete the packet data unit PDU session anchor PSA;

Change the PDU Session Anchor PSA of the Packet Data Unit.
The session control method according to any one of claims 1 or 2, wherein the session management function SMF performs at least on the packet data unit PDU session anchor PSA according to decision information of the intermediate session management function I-SMF Do one of the following:

inserting the Packet Data Unit PDU Session Anchor PSA;

delete the packet data unit PDU session anchor PSA;

Change the PDU Session Anchor PSA of the Packet Data Unit.
A session control method, applied to an intermediate session management function I-SMF, includes:

sending a first session update request to the session management function SMF, where the first session update request carries the decision information of the intermediate session management function I-SMF;

receiving a second session update request sent by the session management function SMF;

generating first control information according to the second session update request;

The first control information is sent to the uplink classifier ULCL or the branch point BP.
The session control method according to claim 4, wherein the first control information is used to update an N4 rule message in the uplink classifier ULCL or the branch point BP.
The session control method according to claim 4, wherein the session control method further comprises:

sending a second control message to the packet data unit PDU session anchor point PSA, the second control message is used to update the packet data unit PDU session anchor point PSA corresponding to the uplink classifier ULCL or the branch point BP N4 rule message.
The session control method according to any one of claims 4 to 6, wherein the first control information is delivered using an N4 rule.
A session control device, comprising:

a request receiving module, the request receiving module is configured to receive a first session update request sent by an intermediate session management function I-SMF, where the first session update request carries decision information of the intermediate session management function I-SMF;

a request generation module, the request generation module is configured to generate a second session update request according to the decision information of the intermediate session management function I-SMF;

A request to send module, the request to send module configured to send the second session update request to a packet data unit PDU session anchor PSA.
A session control device, comprising:

a request sending module, the request sending module is configured to send a first session update request to the session management function SMF, where the first session update request carries decision information of the intermediate session management function I-SMF;

a request receiving module configured to receive a second session update request sent by the session management function SMF;

a control module, the control module is configured to generate first control information according to the second session update request, and send the first control information to the uplink classifier ULCL or the branch point BP.
A session management system, comprising: a session management function SMF and an intermediate session management function I-SMF, wherein,

the intermediate session management function I-SMF sends a session update request to the session management function SMF;

The session management function SMF generates a second session update request according to the decision information of the intermediate session management function I-SMF;

the session management function SMF sends the second session update request to the packet data unit session anchor PSA;

The intermediate session management function I-SMF sends the first control information to the uplink classifier ULCL or the branch point BP.
The session management system of claim 10, wherein the intermediate session management function I-SMF is configured to control the uplink classifier ULCL or branch point BP;

The session management function SMF is configured to send control information to the packet data unit session anchor PSA.
A network element, comprising: a memory, a processor, and a program stored on the memory and executable on the processor; wherein, when the program is executed by the processor, to implement claims 1 to 3 The session control method according to any one of the claims; or, the session control method according to any one of claims 4 to 6.
A computer-readable storage medium for computer-readable storage, wherein the storage medium stores one or more programs that can be executed by one or more processors to realize the claims The session control method according to any one of 1 to 3; or, the session control method according to any one of claims 4 to 6.