CN114071573B - Session control method, apparatus, system and computer readable storage medium - Google Patents
Session control method, apparatus, system and computer readable storage medium Download PDFInfo
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- 238000003860 storage Methods 0.000 title claims abstract description 14
- 230000008569 process Effects 0.000 claims abstract description 10
- 230000005012 migration Effects 0.000 claims description 45
- 238000013508 migration Methods 0.000 claims description 45
- 238000004590 computer program Methods 0.000 claims description 10
- 238000002360 preparation method Methods 0.000 claims description 9
- 230000004044 response Effects 0.000 claims description 7
- 230000004048 modification Effects 0.000 claims description 5
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- 230000002708 enhancing effect Effects 0.000 abstract description 3
- 238000010295 mobile communication Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 16
- 230000006870 function Effects 0.000 description 12
- 238000012545 processing Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/08—Load balancing or load distribution
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/11—Allocation or use of connection identifiers
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, the PCF acquires session information reported by the SMF, wherein the session information comprises a slice identifier of the network slice; the PCF performs policy control on the session based on the slice identity. Through the embodiment of the invention, PCF can accurately obtain the identification of the network slice for providing service for the user during session establishment, thereby enhancing the policy control capability of the core network to the user based on the slice identification 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 5G core networks. Through network slicing techniques, operators can provide customized services on demand for vertical business customers with specific needs. Each slice of the client has a corresponding slice identity on both the network side and the terminal side for the user to access the slice and to establish a session in the slice.
In the related art network slice policy control method, when a terminal registers for access, a policy control function (Policy Control Function, abbreviated as "PCF") provides the terminal with a network slice selection policy (Network Slice Selection Policy, abbreviated as "NSSP") of each APP (application), including a service identifier and a slice identifier.
Disclosure of Invention
After analysis, the inventor finds that when the terminal initiates an APP service request to establish a session, the terminal sends a slice identifier corresponding to the service to the network together, and the network selects one slice for the service to establish the session according to the slice identifier to provide service. However, the slice identifier transmitted when the terminal requests to establish a session is not necessarily the slice identifier at the time of registration. Thus, there may be an inconsistency between the slice identity of the originating session and the identity provided by the PCF, resulting in the PCF not being able to do accurate slice-based session policy control, resulting in network slice capabilities and application fields Jing Shouxian.
One technical problem to be solved by the embodiment of the invention is as follows: 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, the PCF acquires session information reported by the SMF, wherein the session information comprises a slice identifier of the network slice; the PCF performs policy control on the session based on the slice identity.
In some embodiments, the policy control includes one or more of charging policy control, session migration policy control.
In some embodiments, policy control of the session by the PCF based on the slice identification comprises: in response to the current meeting of the session migration condition, the PCF sends the migrated slice identifier of the new slice and the session migration indication 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 then 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 the migration to the AMF, so that the AMF obtains an association 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 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 slice identifier currently used, and the session migration condition is that the correspondence between the session state preconfigured by the PCF and the slice identifier is not matched with the correspondence in the session information reported by the SMF; alternatively, the session migration condition obtains a slice identity modification indication for the PCF.
According to a second aspect of some embodiments of the present invention, there is provided a session control apparatus comprising: the information acquisition module is configured to acquire session information reported by the SMF in the process of establishing a session based on the network slice, wherein the session information comprises a slice identifier of the network slice; and the policy control module is configured to perform 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.
In some embodiments, the policy control module is further configured to send, to the AMF, a slice identifier of the migrated new slice and a session migration indication in response to the session migration condition being currently satisfied, so that the AMF determines an association relationship between the session context and the slice identifier of the new slice, performs session preparation of the new slice, and then sends the slice identifier of the new slice to the terminal.
According to a third aspect of some embodiments of the present invention, there is provided a session control system comprising: PCF, comprising any one of the session control devices described above; and an SMF configured to report session information to the PCF, wherein the session information includes a slice identification of the network slice.
In some embodiments, the session control system further comprises: the AMF is configured to acquire the slice identifier of the migrated new slice and the session migration instruction 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 to 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 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.
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 stored thereon a computer program, wherein the program, when executed by a processor, implements any one of the session control methods described above.
Some of the embodiments of the above invention have the following advantages or benefits: through the embodiment of the invention, PCF can accurately obtain the identification of the network slice for providing service for the user during session establishment, thereby enhancing the policy control capability of the core network to the user based on the slice identification and expanding the application scene of the 5G network slice.
Other features of the present invention and its advantages will become apparent from the following detailed description of exemplary embodiments of the invention, which proceeds with reference to the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
Fig. 1 illustrates a flow diagram of a session control method according to some embodiments of the invention.
Fig. 2 schematically illustrates a scenario of a multi-slice shared AMF of the invention.
Fig. 3 illustrates a flow diagram of a session migration method according to some embodiments of the invention.
Fig. 4 illustrates a schematic structure of a session control apparatus according to some embodiments of the present invention.
Fig. 5 illustrates a schematic diagram of a session control system according to some embodiments of the invention.
Fig. 6 is a schematic diagram showing the structure of a session control apparatus according to other embodiments of the present invention.
Fig. 7 shows a schematic structural diagram of a session control apparatus according to still other embodiments of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise.
Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description.
Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate.
In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary 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, during the session establishment based on the network slice, the PCF obtains session information reported by a session management function (Session Management Function, abbreviated as SMF), where the session information includes a slice identifier of the network slice. The session is a protocol data unit (Protocol Data Unit, abbreviated PDU) session.
In some embodiments, the SMF obtains the slice identity of the network slice by: in the process of establishing a session based on network slices, responding to a request for establishing the session sent by a terminal, the AMF accessed by the terminal selects a corresponding SMF and sends a session establishment message and a slice identifier of a slice currently serving a terminal user to the SMF.
Because the AMF accessed by the terminal has more accurate slice identification, the AMF is sent to the SMF and then to the PCF through the access process, so that the PCF can obtain the accurate slice identification.
In step S104, the PCF performs 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.
Taking charging as an example, after the PCF obtains the accurate slice identifier, more flexible charging operations such as charging quota control can be performed based on the slice identifier.
By the method of the embodiment, PCF can accurately obtain the identification of the network slice for providing service for the user during session establishment, thereby enhancing the policy control capability of the core network to the user based on the slice identification and expanding the application scene of the 5G network slice.
Fig. 2 schematically illustrates a scenario of a multi-slice shared AMF of the invention. As shown in fig. 2, slice a and slice B are deployed in the same AMF area, and each slice is carried by PCF, AMF, service discovery function (NF Repository Function, abbreviated as NRF), SMF, user plane function (User plane Function, abbreviated as UPF), 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 can accommodate the functional and performance characteristics requirements of slice a. In the PCF, an association relationship 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 a user's session to a new slice shared by the same AMF according to traffic or application requirements, the PCF may send the AMF a new slice identification of the user and a session migration indication. 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 invention. As shown in fig. 3, the session migration method of this embodiment includes steps S302 to S306.
In step S302, in response to the session migration condition being currently satisfied, the PCF sends the AMF a slice identification of the new slice after migration, along with a session migration indication.
In some embodiments, the session information reported by the SMF includes a correspondence between a current session state of a user and a slice identifier currently used, and the session migration condition is that the correspondence between the session state preconfigured by the PCF and the slice identifier is not matched with the correspondence in the session information reported by the SMF. The session state includes, for example, a service used by the user, a location of the user, and the like.
The PCF may pre-configure the correspondence between the user, session state, slice identity to provide better quality of slice service for the user. The user may use random or default slices when accessing, so that the correspondence in the session information reported by the SMF may not be the same as the correspondence preconfigured by the PCF. At this point, a session migration operation may be performed to migrate the user from the current slice to the PCF configured slice.
In some embodiments, the session migration condition obtains a slice identity modification indication for the PCF, such as sent by other network elements or third party systems.
For example, when slice a is either too high in load (e.g., above a first preset value) during busy hours, or too low in load (e.g., below a second preset value) during idle hours, it may be desirable to divert some or all of the online users and traffic through slice B. At this point, the PCF may be instructed to migrate the session based on the slice identity.
In step S304, the AMF determines an association relationship between the session context and the slice identity of the new slice.
In some embodiments, the AMF obtains an association between a slice identifier of the original slice and the session context; the AMF replaces the slice identifier of the original slice with the slice identifier of the new slice, and the association relationship between the session context and the slice identifier of the new slice is obtained.
In step S306, the AMF transmits a slice identifier of the new slice to the terminal. Thus, the terminal may interact with the core network based on the slice identity of the new slice after migration.
In the related art, when an established session needs to be migrated to another network slice, 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 re-established. By the method of the embodiment, the terminal can continue to transmit data in the original session after 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 flexibly schedule slices 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 apparatus of the present invention is described below with reference to fig. 4.
Fig. 4 illustrates a schematic structure of a session control apparatus according to some embodiments of the present invention. As shown in fig. 4, the session control apparatus 400 of this embodiment includes: an information obtaining module 4100 configured to obtain session information reported by the SMF in a process of establishing a session based on the network slice, where the session information includes a slice identifier of the network slice; policy control module 4200 is configured to policy control sessions based on slice identifiers.
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 send, to the AMF, a slice identifier of the migrated new slice and a session migration indication in response to the session migration condition being currently satisfied, so that the AMF determines an association between the session context and the slice identifier of the new slice and performs session preparation of 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 schematic 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 one of session control devices 400 described above; and SMF520 configured to report session information to PCF510, wherein the session information includes a slice identification of the network slice.
In some embodiments, the session control system further comprises: AMF530 is configured to obtain the slice identifier of the migrated new slice and the session migration instruction sent by PCF510, determine the association relationship between the session context and the slice identifier of the new slice, perform session preparation of the new slice, and then send the slice identifier of the new slice to the terminal.
In some embodiments, AMF530 is further configured to obtain a slice identifier of the original slice prior to the migration sent by PCF510, 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.
Fig. 6 is a schematic diagram showing the structure 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 perform the session control method of any of the previous embodiments based on instructions stored in the memory 610.
The memory 610 may include, for example, system memory, fixed nonvolatile storage media, and the like. The system memory stores, for example, an operating system, application programs, boot Loader (Boot Loader), and other programs.
Fig. 7 shows a schematic structural diagram of a session control apparatus according to still other embodiments of the present invention. As shown in fig. 7, the session control device 70 of this embodiment includes: memory 710 and processor 720 may also include input-output interfaces 730, network interfaces 740, storage interfaces 750, and the like. These interfaces 730, 740, 750, as well as the memory 710 and the processor 720, may be connected by a bus 760, for example. The input/output interface 730 provides a connection interface for input/output devices such as a display, a mouse, a keyboard, a touch screen, etc. Network interface 740 provides a connection interface for various networking devices. Storage interface 750 provides a connection interface for external storage devices such as SD cards, U-discs, and the like.
An embodiment of the present invention also provides a computer-readable storage medium having stored thereon a computer program, characterized in that the program, when executed by a processor, implements any one of the session control methods described above.
It will be appreciated by those skilled in the art that 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, etc.) 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 flowchart and/or block of the flowchart illustrations and/or block diagrams, and combinations of flowcharts 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 foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (11)
1. A session control method, comprising:
in the process of establishing a session based on a network slice, PCF acquires session information reported by SMF, wherein the session information comprises a slice identifier of the network slice;
the PCF performs policy control on the session based on the slice identifier, and the policy control comprises the following steps: in response to the current meeting of the session migration condition, the PCF sends a slice identifier and a session migration instruction of a new migrated slice 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, wherein the AMF is shared by the network slice and the new migrated slice;
the session information reported by the SMF comprises a corresponding relation between a current session state of a user and a currently used slice identifier, and the session migration condition is that the corresponding relation between the session state pre-configured by the PCF and the slice identifier is not matched with the corresponding relation in the session information reported by the SMF; or, the session migration condition obtains a slice identifier modification indication for the PCF.
2. The session control method according to claim 1, wherein the policy control comprises one or more of charging policy control, session migration policy control.
3. The session control method according to claim 1, wherein the PCF further transmits a slice identifier of an original slice before migration to the AMF, so that the AMF obtains an association relationship between the slice identifier of the original slice and a 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.
4. A session control apparatus comprising:
the information acquisition module is configured to acquire session information reported by the SMF in the process of establishing a session 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 identifier, comprising: in response to the current meeting of the session migration condition, the PCF sends a slice identifier and a session migration instruction of a new migrated slice 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, wherein the AMF is shared by the network slice and the new migrated slice;
the session information reported by the SMF comprises a corresponding relation between a current session state of a user and a currently used slice identifier, and the session migration condition is that the corresponding relation between the session state pre-configured by the PCF and the slice identifier is not matched with the corresponding relation in the session information reported by the SMF; or, the session migration condition obtains a slice identifier modification indication for the PCF.
5. The session control apparatus of claim 4, wherein the policy control comprises one or more of a charging policy control, a session migration policy control.
6. The session control apparatus according to claim 4, wherein the policy control module is further configured to send, to the AMF, a slice identifier of the migrated new slice and a session migration indication in response to the session migration condition being currently satisfied, 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 then sends the slice identifier of the new slice to the terminal.
7. A session control system, comprising:
PCF comprising a session control device according to any one of claims 4 to 6; and
and the SMF is configured to report session information to the PCF, wherein the session information comprises a slice identifier of the network slice.
8. The session control system of claim 7, further comprising:
and the AMF is configured to acquire the slice identifier and the session migration instruction of the migrated new slice 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 to the terminal.
9. The session control system of claim 8, wherein the AMF is further configured to obtain a slice identifier of an original slice before migration sent by the PCF, obtain an association between the slice identifier of the original slice and a 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.
10. A session control apparatus comprising:
a memory; and
a processor coupled to the memory, the processor configured to perform the session control method of any of claims 1-3 based on instructions stored in the memory.
11. A computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, implements the session control method as claimed in any one of claims 1 to 3.
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| WO2019007345A1 (en) * | 2017-07-05 | 2019-01-10 | 中兴通讯股份有限公司 | Method, apparatus, and system for selecting network slice, and storage medium |
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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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