CN114071573A - Session control method, device, system and computer readable storage medium - Google Patents
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Abstract
The invention discloses a session control method, a session control device, a session control system and a computer-readable storage medium, and relates to the field of mobile communication. The session control method comprises the following steps: in the process of establishing a session based on a network slice, a PCF acquires session information reported by an SMF, wherein the session information comprises a slice identifier of the network slice; and the PCF carries out policy control on the session based on the slice identification. By the embodiment of the invention, the PCF can accurately acquire the identifier of the network slice providing service for the user when the session is established, thereby enhancing the policy control capability of the core network on the user based on the slice identifier and expanding the application scene of the 5G network slice.
Description
Technical Field
The present invention relates to the field of mobile communications, and in particular, to a session control method, apparatus, system, and computer-readable storage medium.
Background
Network slicing is one of the key technologies of a 5G core network. Through the network slicing technology, an operator can provide customized services for vertical industry customers with specific requirements according to needs. Each slice of the client has a corresponding slice identifier on both the network side and the terminal side for the user to access the slice and establish a session in the slice.
In a Network Slice Policy Control method in the related art, when a terminal registers and accesses, a Policy Control Function (PCF) provides a Network Slice Selection Policy (NSSP) of each APP (application) for the terminal, where the Policy Selection Policy includes a service identifier and a Slice identifier.
Disclosure of Invention
The inventor finds out after analysis that when a terminal initiates an APP service request to establish a session, slice identifiers corresponding to the service are sent to a network together, and the network selects one slice for the service according to the slice identifiers to establish the session to provide services. However, the slice identifier transmitted when the terminal requests establishment of the session is not necessarily the slice identifier at the time of registration. Therefore, the slice identifier for initiating the session and the identifier provided by the PCF may be inconsistent, which results in that the PCF cannot perform accurate slice-based session policy control, so that the network slicing capability and the application scenario are limited.
The embodiment of the invention aims to solve the technical problem that: how to extend the capabilities and application scenarios of network slicing.
According to a first aspect of some embodiments of the present invention, there is provided a session control method, including: in the process of establishing a session based on a network slice, a PCF acquires session information reported by an SMF, wherein the session information comprises a slice identifier of the network slice; and the PCF carries out policy control on the session based on the slice identification.
In some embodiments, the policy control includes one or more of charging policy control, session migration policy control.
In some embodiments, the PCF performs policy control on the session based on the slice identification comprising: in response to the current meeting of the session migration condition, the PCF sends the slice identifier of the new slice after migration and a session migration instruction to the AMF, so that the AMF determines the association relationship between the session context and the slice identifier of the new slice, performs session preparation of the new slice, and sends the slice identifier of the new slice to the terminal.
In some embodiments, the PCF further sends the slice identifier of the original slice before migration to the AMF, so that the AMF obtains an association relationship between the slice identifier of the original slice and the session context, and replaces the slice identifier of the original slice with the slice identifier of the new slice to obtain an association relationship between the session context and the slice identifier of the new slice.
In some embodiments, the session information reported by the SMF includes a correspondence between a current session state of the user and a currently used slice identifier, and the session migration condition is that a correspondence between the session state preconfigured by the PCF and the slice identifier is not matched with a correspondence in the session information reported by the SMF; or the session migration condition is that the PCF acquires the slice identifier modification indication.
According to a second aspect of some embodiments of the present invention, there is provided a session control apparatus, including: the information acquisition module is configured to acquire session information reported by the SMF in a session establishment process based on the network slice, wherein the session information comprises a slice identifier of the network slice; and the strategy control module is configured to carry out strategy control on the session based on the slice identification.
In some embodiments, the policy control includes one or more of charging policy control, session migration policy control.
In some embodiments, the policy control module is further configured to, in response to that the session migration condition is currently satisfied, send, to the AMF, a slice identifier of the new slice after migration and a session migration indication, so that the AMF determines an association relationship between the session context and the slice identifier of the new slice, performs session preparation for the new slice, and sends, to the terminal, the slice identifier of the new slice.
According to a third aspect of some embodiments of the present invention, there is provided a session control system comprising: a PCF comprising any of the session control devices described above; and the SMF is configured to report session information to the PCF, wherein the session information comprises the slice identifier of the network slice.
In some embodiments, the session control system further comprises: and the AMF is configured to acquire the slice identifier of the migrated new slice and the session migration indication sent by the PCF, determine the association relationship between the session context and the slice identifier of the new slice, perform session preparation of the new slice, and send the slice identifier of the new slice by the terminal.
In some embodiments, the AMF is further configured to obtain a slice identifier of the original slice before the migration sent by the PCF, obtain an association relationship between the slice identifier of the original slice and the session context, and replace the slice identifier of the original slice with the slice identifier of the new slice to obtain an association relationship between the session context and the slice identifier of the new slice.
According to a fourth aspect of some embodiments of the present invention, there is provided a session control apparatus comprising: a memory; and a processor coupled to the memory, the processor configured to perform any of the foregoing session control methods based on instructions stored in the memory.
According to a fifth aspect of some embodiments of the present invention, there is provided a computer readable storage medium having a computer program stored thereon, wherein the program, when executed by a processor, implements any one of the session control methods described above.
Some embodiments of the above invention have the following advantages or benefits: by the embodiment of the invention, the PCF can accurately acquire the identifier of the network slice providing service for the user when the session is established, thereby enhancing the policy control capability of the core network on the user based on the slice identifier and expanding the application scene of the 5G network slice.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 illustrates a flow diagram of a session control method according to some embodiments of the invention.
Fig. 2 schematically shows a multi-slice shared AMF scenario of the present invention.
FIG. 3 illustrates a flow diagram of a session migration method according to some embodiments of the inventions.
Fig. 4 illustrates a schematic structural diagram of a session control device according to some embodiments of the present invention.
Fig. 5 illustrates a block diagram of a session control system according to some embodiments of the invention.
Fig. 6 is a schematic structural diagram of a session control apparatus according to other embodiments of the present invention.
Fig. 7 shows a schematic structural diagram of a session control device according to further embodiments of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Fig. 1 illustrates a flow diagram of a session control method according to some embodiments of the invention. As shown in fig. 1, the session control method of this embodiment includes steps S102 to S104.
In step S102, in the process of establishing a Session based on a network slice, the PCF obtains Session information reported by a Session Management Function (SMF), where the Session information includes a slice identifier of the network slice. The session is a Protocol Data Unit (PDU) session.
In some embodiments, the SMF obtains the slice identification for the network slice by: in the process of establishing a session based on a network slice, in response to a request for establishing the session sent by an acquisition terminal, an AMF accessed by the terminal selects a corresponding SMF, and sends a session establishment message and a slice identifier of a slice currently providing service for a terminal user to the SMF.
The AMF accessed by the terminal has more accurate slice identification, so that the AMF is sent to the SMF and then to the PCF through the access process, and the PCF can obtain the accurate slice identification.
In step S104, the PCF performs policy control on the session based on the slice identifier.
In some embodiments, the policy control includes one or more of charging policy control, session migration policy control.
Taking charging as an example, after the PCF obtains an accurate slice identifier, more flexible charging operations such as charging quota control and the like can be performed based on the slice identifier.
By the method of the embodiment, the PCF can accurately acquire the identifier of the network slice providing service for the user when the session is established, so that the policy control capability of the core network on the user based on the slice identifier is enhanced, and the application scene of the 5G network slice is expanded.
Fig. 2 schematically shows a multi-slice shared AMF scenario of the present invention. As shown in fig. 2, a slice a and a slice B are deployed in the same AMF area, and each slice is carried by a PCF, an AMF, a service discovery Function (NF (discovery Function, NRF for short), an SMF, a User plane Function (UPF for short), and other devices. The terminal accesses different data networks DN1 and DN2 through the base station and different slices to perform different services. Slice B may accommodate the functional and performance characteristic requirements of slice a. In PCF, an association between the slice identity and the AMF may be established. In a deployment scenario where the AMF is shared by multiple slices, if the PCF decides to migrate the session of the user to a new slice shared by the same AMF according to the service or application requirements, the PCF may send the new slice identifier of the user and a session migration indication to the AMF. An embodiment of the session migration method of the present invention is described below with reference to fig. 3.
FIG. 3 illustrates a flow diagram of a session migration method according to some embodiments of the inventions. As shown in fig. 3, the session migration method of this embodiment includes steps S302 to S306.
In step S302, in response to that the session migration condition is currently satisfied, the PCF sends the slice identifier of the new slice after migration and a session migration indication to the AMF.
In some embodiments, the session information reported by the SMF includes a correspondence between a current session state of the user and a currently used slice identifier, and the session migration condition is that a correspondence between a session state preconfigured by the PCF and the slice identifier is not matched with a correspondence in the session information reported by the SMF. The session state includes, for example, the services used by the user, the location of the user, and so on.
The PCF pre-configures the correspondence among the user, the session state, and the slice identifier to provide a better slicing service for the user. The user may use a random or default slice during access, so the correspondence in the session information reported by the SMF may not match the correspondence pre-configured by the PCF. At this time, a session migration operation may be performed to migrate the user from the current slice to the slice configured by the PCF.
In some embodiments, the session migration condition is that the PCF obtains a slice identity modification indication, which is sent by, for example, another network element or a third-party system.
For example, when the load of slice a is too high (e.g., higher than a first preset value) in busy hours or the load of slice a is too low (e.g., lower than a second preset value) in idle hours, a power saving state may be entered, some or all of the online users and traffic may need to be offloaded through slice B. At this point, the PCF may be instructed to perform a migration of the session based on the slice identity.
In step S304, the AMF determines an association between the session context and the slice identification of the new slice.
In some embodiments, the AMF obtains an association relationship between a slice identifier of the original slice and a session context; and the AMF replaces the slice identifier of the original slice with the slice identifier of the new slice to obtain the association relation between the session context and the slice identifier of the new slice.
In step S306, the AMF sends the slice identification of the new slice to the terminal. Thus, the terminal may interact with the core network based on the slice identifier of the new slice after migration.
In the related technology, when an established session needs to be migrated to other network slices, the PCF modifies the slice selection policy of the user and sends it to the user terminal through the AMF, and the terminal can only select a new slice when the session is reestablished. By the method of the embodiment, the terminal can continue to transmit data in the original session after the migration. Thereby reducing or clearing the load of the original slice. The embodiment can be that an operator cooperates with a third-party application to carry out flexible slice scheduling according to the application; fast load scheduling between slices can also be achieved. And in this process the user experience is not affected.
An embodiment of the session control device of the present invention is described below with reference to fig. 4.
Fig. 4 illustrates a schematic structural diagram of a session control device according to some embodiments of the present invention. As shown in fig. 4, the session control device 400 of this embodiment includes: an information obtaining module 4100 configured to obtain session information reported by the SMF in a session establishment process based on a network slice, where the session information includes a slice identifier of the network slice; a policy control module 4200 configured to policy control the session based on the slice identification.
In some embodiments, the policy control includes one or more of charging policy control, session migration policy control.
In some embodiments, the policy control module 4200 is further configured to, in response to the session migration condition being currently satisfied, send the slice identifier of the new slice after migration and a session migration indication to the AMF, so that the AMF determines an association relationship between the session context and the slice identifier of the new slice, performs session preparation for the new slice, and then sends the slice identifier of the new slice to the terminal.
An embodiment of the session control system of the present invention is described below with reference to fig. 5.
Fig. 5 illustrates a block diagram of a session control system according to some embodiments of the invention. As shown in fig. 5, the session control system 50 of this embodiment includes: PCF510, PCF510 comprising any of the foregoing session control apparatuses 400; and an SMF520 configured to report session information to the PCF510, wherein the session information includes a slice identification of the network slice.
In some embodiments, the session control system further comprises: the AMF530 is configured to obtain the slice identifier of the migrated new slice and the session migration indication sent by the PCF510, determine an association relationship between the session context and the slice identifier of the new slice, perform session preparation for the new slice, and then send the slice identifier of the new slice to the terminal.
In some embodiments, the AMF530 is further configured to obtain a slice identifier of the original slice before the migration sent by the PCF510, obtain an association relationship between the slice identifier of the original slice and the session context, and replace the slice identifier of the original slice with the slice identifier of the new slice to obtain an association relationship between the session context and the slice identifier of the new slice.
Fig. 6 is a schematic structural diagram of a session control apparatus according to other embodiments of the present invention. As shown in fig. 6, the session control device 60 of this embodiment includes: a memory 610 and a processor 620 coupled to the memory 610, the processor 620 being configured to execute the session control method in any of the foregoing embodiments based on instructions stored in the memory 610.
Fig. 7 shows a schematic structural diagram of a session control device according to further embodiments of the present invention. As shown in fig. 7, the session control device 70 of this embodiment includes: the memory 710 and the processor 720 may further include an input/output interface 730, a network interface 740, a storage interface 750, and the like. These interfaces 730, 740, 750, as well as the memory 710 and the processor 720, may be connected, for example, by a bus 760. The input/output interface 730 provides a connection interface for input/output devices such as a display, a mouse, a keyboard, and a touch screen. The network interface 740 provides a connection interface for various networking devices. The storage interface 750 provides a connection interface for external storage devices such as an SD card and a usb disk.
An embodiment of the present invention also provides a computer-readable storage medium on which a computer program is stored, wherein the program is configured to implement any one of the session control methods described above when executed by a processor.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention 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, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (13)
1. A session control method, comprising:
in the process of establishing a session based on a network slice, a PCF acquires session information reported by an SMF, wherein the session information comprises a slice identifier of the network slice;
and the PCF carries out policy control on the session based on the slice identification.
2. The session control method of claim 1, wherein the policy control comprises one or more of charging policy control, session migration policy control.
3. The session control method of claim 1, wherein the PCF policy-controls the session based on the slice identification comprises:
in response to the current meeting of the session migration condition, the PCF sends the slice identifier of the new slice after migration and a session migration instruction to the AMF, so that the AMF determines the association relationship between the session context and the slice identifier of the new slice, performs session preparation of the new slice, and sends the slice identifier of the new slice to the terminal.
4. The session control method of claim 3, wherein the PCF further sends the slice identifier of the original slice before migration to the AMF, so that the AMF obtains the association relationship between the slice identifier of the original slice and the session context, and replaces the slice identifier of the original slice with the slice identifier of the new slice to obtain the association relationship between the session context and the slice identifier of the new slice.
5. The session control method according to claim 3, wherein:
the session information reported by the SMF comprises the corresponding relation between the current session state of the user and the currently used slice identifier, and the session transfer condition is that the corresponding relation between the session state and the slice identifier pre-configured by the PCF is not matched with the corresponding relation in the session information reported by the SMF; or
And the session migration condition is that the PCF acquires a slice identifier modification instruction.
6. A session control apparatus comprising:
the information acquisition module is configured to acquire session information reported by the SMF in a session establishment process based on a network slice, wherein the session information comprises a slice identifier of the network slice;
a policy control module configured to policy control the session based on the slice identification.
7. The session control device of claim 6, wherein the policy control comprises one or more of charging policy control, session migration policy control.
8. The session control device according to claim 6, wherein the policy control module is further configured to send, in response to that the session migration condition is currently satisfied, a slice identifier of the new slice after migration and a session migration indication to the AMF, so that the AMF determines an association relationship between a session context and the slice identifier of the new slice, performs session preparation of the new slice, and sends the slice identifier of the new slice to the terminal.
9. A session control system, comprising:
a PCF comprising a session control device according to any of claims 6 to 8; and
and the SMF is configured to report session information to the PCF, wherein the session information comprises the slice identifier of the network slice.
10. The session control system of claim 9, further comprising:
and the AMF is configured to acquire the slice identifier of the migrated new slice and a session migration instruction sent by the PCF, determine an association relationship between a session context and the slice identifier of the new slice, perform session preparation of the new slice, and send the slice identifier of the new slice to the terminal.
11. The session control system of claim 10, wherein the AMF is further configured to obtain a slice identifier of the original slice before migration sent by the PCF, obtain an association between the slice identifier of the original slice and the session context, and replace the slice identifier of the original slice with the slice identifier of the new slice to obtain an association between the session context and the slice identifier of the new slice.
12. A session control apparatus comprising:
a memory; and
a processor coupled to the memory, the processor configured to execute the session control method of any of claims 1-5 based on instructions stored in the memory.
13. A computer-readable storage medium, on which a computer program is stored, which program, when executed by a processor, implements a session control method as claimed in any one of claims 1 to 5.
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| CN110933711A (en) * | 2018-09-19 | 2020-03-27 | 华为技术有限公司 | Policy control method, device and system |
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| CN107919969A (en) * | 2016-10-09 | 2018-04-17 | 中国移动通信有限公司研究院 | Policy control method and device |
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