WO2022028580A1

WO2022028580A1 - Reselection determination method, network data analytic function and storage medium

Info

Publication number: WO2022028580A1
Application number: PCT/CN2021/111215
Authority: WO
Inventors: 秦鹏太; 李爱华; 魏彬
Original assignee: 中国移动通信有限公司研究院; 中国移动通信集团有限公司
Priority date: 2020-08-07
Filing date: 2021-08-06
Publication date: 2022-02-10
Also published as: CN114071626A

Abstract

Disclosed is a reselection determination method, a network data analytic function and a medium. The method comprises: a network data analytic function initiating user position subscription to an access and mobility management function, wherein a network data analytic service for a user is provided by the network data analytic function; determining, according to a position notified by the access and mobility management function, whether the provision of the network data analytic service can be continued; and if it is determined that the provision of the network data analytic service cannot be continued, initiating network data analytic function reselection.

Description

Reselection decision method, network data analysis function and storage medium

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to Chinese Patent Application No. 202010787802.7 filed in China on Aug. 7, 2020, the entire contents of which are incorporated herein by reference.

technical field

The present disclosure relates to the technical field of wireless communication, and in particular, to a reselection decision method, a network data analysis function, and a medium.

Background technique

Figure 1 is a schematic diagram of the network architecture defined by the 5G Core Network (5GC) standard. As shown in the figure, the control plane adopts a Service Based Interface (SBI) interface:

5G network urgently needs to comprehensively sort out how to support intelligence from the aspects of architecture level and key issues, including data collection mechanism, closed-loop feedback of data analysis results to 5GC, and how 5GC controls and processes.

Among them, according to the definition of 3GPP intelligent introduction, the network data analytic function (NWDAF) is an independent logical function in 5GC, which is specially responsible for data collection, data analysis and analysis result feedback.

As a standardized network element introduced by 3GPP in 5GC, NWDAF is the artificial intelligence (AI) + big data engine of 5GC. It has the characteristics of standardization of capabilities, aggregation of network data, higher real-time performance, and support for closed-loop controllability.

NWDAF mainly has the following network functions:

data collection;

data analysis;

Analysis results feedback;

For other intelligent systems;

Interact with data, models, and parameters.

As an intelligent node of the core network, NWDAF has scenarios where NWDAF re-selection is required due to changes in user mobility: for the location of user equipment (User Equipment, UE), the current NWDAF may not be able to continue to provide intelligent analysis for the UE after the location has moved. Considering the above scenario, the NWDAF node needs to have the addressing capability of the reselection target NWDAF.

A related solution is:

The Access and Mobility Management Function (AMF) registers the obtained NWDAF message with the Unified Data Management (UDM), and when the user moves, the location changes, and the relevant network element queries the UDM to obtain it The NWDAF corresponding to the AMF, and then complete the related process of NWDAF reselection.

The disadvantage of the related art is that there is no specific scheme for NWDAF reselection applicable to common scenarios.

SUMMARY OF THE INVENTION

The present disclosure provides a reselection decision method, a network data analysis function and a storage medium, so as to provide a user mobility-based NWDAF reselection scheme suitable for common scenarios.

The present disclosure provides the following technical solutions:

A reselection decision method comprising:

User location subscription initiated by the NWDAF to the access and mobility management function AMF, the network data analysis service of the user is provided by the NWDAF;

NWDAF determines whether it can continue to provide network data analysis services according to the location notified by AMF;

If NWDAF determines that it cannot continue to provide, it initiates NWDAF reselection.

In implementation, the location notified by the AMF is the location sent by the AMF after judging that the user's routing area identifier TAI has changed according to the NWDAF user location subscription.

The implementation further includes:

According to the changed location, the NWDAF queries the NRF for the target NWDAF that provides users with network data analysis services after the location changes.

The implementation further includes:

The NWDAF sends a handover request to the target NWDAF, requesting the target NWDAF to accept the user's network data analysis task.

The implementation further includes:

The NWDAF sends network data analysis information to the target NWDAF.

In implementation, the original NWDAF and/or the target NWDAF notify the consumer network function entity consumer NF about the NWDAF reselection event. After the reselection is completed, the original NWDAF informs the source NF to cancel the original subscription.

An NWDAF comprising:

The processor, for reading the program in memory, performs the following processes:

User location subscription initiated to the access and mobility management function AMF, the network data analysis service of the user is provided by the NWDAF;

Determine whether the network data analysis service can continue to be provided according to the location notified by the AMF;

If it is determined that it cannot continue to be provided, NWDAF reselection is initiated;

A transceiver for receiving and transmitting data under the control of the processor.

The implementation further includes:

According to the changed location, query the NRF for the target NWDAF that provides users with network data analysis services after the location changes.

The implementation further includes:

Send a handover request to the target NWDAF, requesting the target NWDAF to accept the user's network data analysis task.

The implementation further includes:

Send network data analysis information to the target NWDAF.

In implementation, initiating NWDAF reselection is to notify the consumer NF to initiate NWDAF reselection.

During implementation, the original NWDAF and/or the target NWDAF notify the consumer NF about the NWDAF reselection event, and after the reselection is completed, the original NWDAF informs the source NF to cancel the original subscription.

An NWDAF comprising:

a subscription module, configured to subscribe to the user location initiated by the access and mobility management function AMF, the network data analysis service of the user is provided by the NWDAF;

The service module is used to determine whether the network data analysis service can be continued to be provided according to the location notified by the AMF;

The reselection module is used to initiate NWDAF reselection if it is determined that it cannot continue to provide.

In implementation, the service module is further configured to receive the location sent by the AMF according to the NWDAF user location subscription, after judging that the user's routing area identifier TAI has changed.

The implementation further includes:

The target query module is used to query the NRF for the target NWDAF that provides network data analysis services for users after the position change according to the changed position.

The implementation further includes:

A handover request module, configured to send a handover request to the target NWDAF, requesting the target NWDAF to accept the user's network data analysis task.

The implementation further includes:

A sending module, configured to send the network data analysis information to the target NWDAF.

During implementation, NWDAF initiates NWDAF reselection, which is to notify the consumer NF to initiate NWDAF reselection.

In implementation, the reselection module is further used to notify the consumer NF about the NWDAF reselection event, and notify the source NF to cancel the original subscription after the reselection is completed.

A computer-readable storage medium storing a computer program for executing the above reselection decision method.

The beneficial effects of the present disclosure are as follows:

In the technical solution provided by the embodiments of the present disclosure, since the NWDAF is used to find the target NWDAF based on the location change to complete the reselection process, the NWDAF reselection based on user mobility can be realized, and the NWDAF reselection can be efficiently realized on the basis of the relevant network architecture. .

Further, the degree of overlap between the intelligent analysis business process and the user's actual business process is reduced.

Further, the lack of relevant scenarios in related technologies is supplemented, and it is easy to be promoted in a unified manner.

Description of drawings

The accompanying drawings described herein are used to provide further understanding of the present disclosure and constitute a part of the present disclosure. The exemplary embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation of the present disclosure. In the attached image:

1 is a schematic diagram of the network architecture defined by the 5GC standard in the background technology;

2 is a schematic flowchart of the implementation of the reselection decision method on the NWDAF side in an embodiment of the present disclosure;

3 is a schematic flowchart of the implementation of the AMF side selection processing method in the embodiment of the disclosure;

FIG. 4 is a schematic flowchart of the implementation of the method for selecting a consumer NF side in an embodiment of the present disclosure;

5 is a schematic diagram of the NWDAF reselection process flow in Embodiment 1 of the present disclosure;

6 is a schematic diagram of the NWDAF reselection process flow in Embodiment 2 of the present disclosure;

FIG. 7 is a schematic structural diagram of an NWDAF in an embodiment of the present disclosure.

detailed description

For existing scenarios, an NWDAF reselection process based on user mobility is proposed in the embodiments of the present disclosure, which can efficiently implement NWDAF reselection on the basis of a relevant network architecture.

The specific embodiments of the present disclosure will be described below with reference to the accompanying drawings.

In the description process, the implementation of the NWDAF, AMF and consumer NF sides will be described respectively, and then an example of their coordinated implementation will be given to better understand the implementation of the solutions given in the embodiments of the present disclosure. Such a description does not mean that they must be implemented together or separately. In fact, when they are implemented separately, they each solve their own problems. When the two are used together, a better technology will be obtained. Effect.

In the solution provided by the embodiments of the present disclosure, NWDAF is used to subscribe (single or a group) of UE location change event requests to AMF. After location change, NWDAF supports querying NRF to obtain a target NWDAF that provides service capabilities for the new location, and NWDAF supports notification. The consumer NF (consumer NF; NF: network function entity, Network Function) initiates NWDAF reselection, and supports the transfer of relevant analysis data information to the target NWDAF, and the target NWDAF notifies the consumer NF to continue to provide analysis services after completing the data acceptance. According to the user location changing scenarios, there are two scenarios: AMF unchanged and AMF changed.

Each of them will be described below.

FIG. 2 is a schematic flowchart of the implementation of the reselection decision method on the NWDAF side. As shown in the figure, it may include:

Step 201, the user location subscription initiated by the NWDAF to the access and mobility management function AMF, the network data analysis service of the user is provided by the NWDAF;

Step 202, NWDAF determine whether it can continue to provide network data analysis service according to the position notified by AMF;

Step 203: If the NWDAF determines that it cannot continue to provide, initiate NWDAF reselection.

Specifically, in step 202, the NWDAF can locally configure and store the location information that provides intelligent analysis. After accepting the change of the user's location information, it can determine whether it can continue by judging whether the new location information is within the range that can provide services. Provide network data analysis services.

That is, the NWDAF subscribes the user location change to the AMF, so that the AMF will notify when the user location changes.

The implementation further includes:

That is, the source NWDAF has the ability to query the target NWDAF from the NRF (Network Repository Function) according to the new location information.

The implementation further includes:

The NWDAF sends network data analysis information to the target NWDAF.

Specifically, according to the result returned by the NRF, the original NWDAF sends a handover request to the target NWDAF, requesting the target NWDAF to accept the user analysis task; after the target NWDAF confirms the reply, it starts to transmit the relevant information (including the model). After the information transfer is completed, the target NWDAF informs the original NWDAF that the acceptance has been completed.

Specifically, the source NWDAF notifies the consumer to perform NWDAF reselection, and the NWDAF can send the Nnwdaf_AnalyticsSubscription_Notify (NWDAF analysis subscription notification) message to the consumer NF to notify the consumer NF to start NWDAF reselection.

During implementation, the NWDAF and/or the target NWDAF notify the consumer NF about the NWDAF reselection event, and after the reselection is completed, the original NWDAF informs the source NF to cancel the original subscription.

Figure 3 is a schematic diagram of the implementation process of the AMF side selection processing method, as shown in the figure, may include:

Step 301, AMF receives NWDAF subscription request notification, and the notification request notifies NWDAF when user location changes;

Step 302: When the user location changes, the AMF sends a user location change notification to the NWDAF.

The implementation further includes:

When the AMF serving the user changes, the AMF notifies the changed AMF of the subscription requirement of the NWDAF.

In a specific implementation, the AMF notifies the changed AMF of the subscription requirement of the NWDAF through the Namf_Communication_CreateUEContext Request message.

That is, the source AMF transmits the NWDAF-related location subscription information to the target AMF through the Namf_Communication_CreateUEContext Request (Namf Communication Create UEContext Request).

Figure 4 is a schematic diagram of the implementation process of the consumer NF side selection processing method. As shown in the figure, it can include:

Step 401, the consumer NF receives the notification that NWDAF initiates NWDAF reselection;

Step 402, the consumer NF initiates NWDAF reselection according to the notification.

Examples are given below.

Example 1

In this example, the AMF serving the UE remains unchanged.

5 is a schematic diagram of the NWDAF reselection process flow in Embodiment 1. As shown in the figure, the main steps can be as follows:

1. The user goes online normally, and the NF consumer discovers NWDAF through NRF.

2. NWDAF discovers the source NF node serving the UE and subscribes to the collection request.

Specifically, for example, NWDAF discovers the source NF node serving the UE according to protocol 23.288 and subscribes to the collection request.

3. The NWDAF subscribes the UE location change to the AMF.

4. The user moves and the location changes. If the AMF does not change, the AMF will notify the NWDAF of the user location change; carry key information such as the user location, for example: TAI (Tracking Area Identity) + CELL ID (cell identity).

5. NWDAF determines whether it can continue to provide analysis services based on the new location information, and if it cannot start the reselection process. NWDAF notifies the consumer NF to start NWDAF reselection.

6. The NWDAF carries UE-related information (eg, slice ID, location information, analysis ID) to the NRF to discover a target NWDAF that can provide services.

7. According to the result returned by the NRF, the original NWDAF sends a handover request to the target NWDAF, requesting the target NWDAF to accept the user analysis task.

8. After the target NWDAF confirms the reply, it starts to transmit relevant information (including analysis ID and model). After the information transfer is completed, the target NWDAF informs the original NWDAF that the acceptance has been completed. The original NWDAF notifies the source NF to unsubscribe from the collection request.

9. The target NWDAF/original NWDAF notifies the consumer NF to complete the NWDAF reselection.

10. The target NWDAF discovers the source NF of the UE serving the UE after the handover based on the definition in 23.288 and issues a subscription collection request.

Specifically, for example, the target NWDAF discovers the node serving the UE after handover based on the definition according to 23.288 and starts to collect data.

Example 2

In this example, after the location of the UE changes, the AMF serving the UE changes.

6 is a schematic diagram of the NWDAF reselection process flow in Embodiment 2. As shown in the figure, the main steps can be as follows:

2. NWDAF finds the source NF of the serving UE of the serving UE and subscribes to the collection request.

Specifically, for example, NWDAF discovers the source NF of the serving UE of the serving UE according to the provisions of the protocol 23.288 and subscribes to the collection request.

3. The NWDAF subscribes the UE location change to the AMF.

4. The user moves and the location changes. If the AMF changes, the old AMF transmits the location subscription information to the new AMF through the Namf_Communication_CreateUEContext Request, carrying key information such as user location, for example: TAI+CELL ID.

5. After the AMF switching process is completed, the new AMF notifies the NWDAF of the user location change.

6. Based on the new location information, NWDAF determines whether it can continue to provide the analysis service, and if it cannot provide it, it starts the reselection process.

7. NWDAF notifies consumer NF to start NWDAF reselection.

8. The NWDAF carries the UE-related information (slice ID, location information, analysis ID) to the NRF to discover the target NWDAF that can provide services.

9. According to the result returned by the NRF, the original NWDAF sends a handover request to the target NWDAF, requesting the target NWDAF to accept the user analysis task.

10. After the target NWDAF confirms the reply, it starts to transmit the relevant information (including the model). After the information transfer is completed, the target NWDAF informs the original NWDAF that the acceptance has been completed.

11. The target NWDAF/original NWDAF notifies the consumer NF to complete the NWDAF reselection; the original NWDAF notifies the source NF to cancel the subscription collection request.

12. The target NWDAF discovers the source NF of the UE serving the UE after handover based on the definition in 23.288 and subscribes to the collection request.

Based on the same inventive concept, an NWDAF and a computer-readable storage medium are also provided in the embodiments of the present disclosure. Since the principle of solving the problem of these devices is similar to the reselection decision method, the implementation of these devices can refer to the implementation of the method, and the repetition is repeated. It is not repeated here.

When implementing the technical solutions provided by the embodiments of the present disclosure, it can be implemented as follows.

Figure 7 is a schematic diagram of the NWDAF structure, as shown in the figure, including:

The processor 700 is configured to read the program in the memory 720 and perform the following processes:

The transceiver 710 is used to receive and transmit data under the control of the processor 700 .

The implementation further includes:

Send network data analysis information to the target NWDAF.

7, the bus architecture may include any number of interconnected buses and bridges, specifically one or more processors represented by processor 700 and various circuits of memory represented by memory 720 are linked together. The bus architecture may also link together various other circuits, such as peripherals, voltage regulators, and power management circuits, which are well known in the art and therefore will not be described further herein. The bus interface provides the interface. Transceiver 710 may be a number of elements, ie, including a transmitter and a receiver, that provide a means for communicating with various other devices over a transmission medium. The processor 700 is responsible for managing the bus architecture and general processing, and the memory 720 may store data used by the processor 700 in performing operations.

Embodiments of the present disclosure also provide an NWDAF, including:

The implementation further includes:

An embodiment of the present disclosure further provides a computer-readable storage medium, where the computer-readable storage medium stores a computer program for executing the above reselection decision method.

For specific implementation, refer to the implementation of the reselection decision method on the NWDAF side.

For the convenience of description, each part of the device described above is divided into various modules or units by function and described respectively. Of course, when implementing the present disclosure, the functions of each module or unit may be implemented in one or more software or hardware.

To sum up, in the technical solutions provided by the embodiments of the present disclosure, the NWDAF subscribes to the AMF for user location changes; the source NWDAF has the ability to query the target NWDAF from the NRF according to the new location information;

The source AMF transmits the NWDAF-related location subscription information to the target AMF through the Namf_Communication_CreateUEContext Request;

The source NWDAF notifies the consumer to perform NWDAF reselection;

The target NWDAF notifies the consumer to complete the NWDAF reselection.

It can be seen that using NWDAF to find the target NWDAF based on the location change to NRF to complete the reselection process, reducing the degree of overlap between the intelligent analysis business process and the user's actual business process.

The scheme covers two scenarios of user location change.

It complements the lack of related scenarios in related technologies, and is easy to follow-up unified promotion.

It can be understood that the embodiments described in the embodiments of the present disclosure may be implemented by hardware, software, firmware, middleware, microcode, or a combination thereof. For hardware implementation, modules, units, sub-modules, sub-units, etc. can be implemented in one or more application specific integrated circuits (Application Specific Integrated Circuits, ASIC), digital signal processors (Digital Signal Processing, DSP), digital signal processing equipment ( DSP Device, DSPD), Programmable Logic Device (Programmable Logic Device, PLD), Field-Programmable Gate Array (Field-Programmable Gate Array, FPGA), general-purpose processor, controller, microcontroller, microprocessor, for in other electronic units or combinations thereof that perform the functions described in this disclosure.

As will be appreciated by one skilled in the art, embodiments of the present disclosure may be provided as a method, system, or computer program product. Accordingly, the present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present disclosure may take the form of a computer program product embodied on one or more computer-usable storage media having computer-usable program code embodied therein, including but not limited to disk storage, optical storage, and the like.

The present disclosure is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the disclosure. It will be understood that each process and/or block in the flowchart illustrations and/or block diagrams, and combinations of processes and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to the processor of a general purpose computer, special purpose computer, embedded processor or other programmable data processing device to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing device produce Means for implementing the functions specified in a flow or flow of a flowchart and/or a block or blocks of a block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory result in an article of manufacture comprising instruction means, the instructions The apparatus implements the functions specified in the flow or flow of the flowcharts and/or the block or blocks of the block diagrams.

These computer program instructions can also be loaded on a computer or other programmable data processing device to cause a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process such that The instructions provide steps for implementing the functions specified in the flow or blocks of the flowcharts and/or the block or blocks of the block diagrams.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present disclosure without departing from the spirit and scope of the present disclosure. Thus, provided that these modifications and variations of the present disclosure fall within the scope of the claims of the present disclosure and their equivalents, the present disclosure is also intended to cover such modifications and variations.

Claims

A reselection decision method comprising:

The user location subscription initiated by the network data analysis function NWDAF to the access and mobility management function AMF, the network data analysis service of the user is provided by the NWDAF;

NWDAF determines whether it can continue to provide network data analysis services according to the location notified by AMF;

If NWDAF determines that it cannot continue to provide, it initiates NWDAF reselection.
The method according to claim 1, wherein the location notified by the AMF is the location sent by the AMF after judging that the user's routing area identifier TAI changes according to the NWDAF user location subscription.
The method of claim 1, further comprising:

According to the changed location, the NWDAF queries the network storage function NRF for the target NWDAF that provides the user with network data analysis services after the location change.
The method of claim 3, further comprising:

The NWDAF sends a handover request to the target NWDAF, requesting the target NWDAF to accept the user's network data analysis task.
The method of claim 4, further comprising:

The NWDAF sends network data analysis information to the target NWDAF.
The method according to claim 1, wherein when the NWDAF initiates the NWDAF reselection, it is to notify the consumer network function entity, the consumer NF, to initiate the NWDAF reselection.
The method according to claim 6, wherein the original NWDAF and/or the target NWDAF notifies the consumer NF about the NWDAF reselection event, and after the reselection is completed, the original NWDAF notifies the source NF to cancel the original subscription.
A network data analysis function NWDAF, including:

The processor, for reading the program in memory, performs the following processes:

User location subscription initiated to the access and mobility management function AMF, the network data analysis service of the user is provided by the NWDAF;

Determine whether the network data analysis service can continue to be provided according to the location notified by AMF;

If it is determined that it cannot continue to be provided, NWDAF reselection is initiated;

A transceiver for receiving and transmitting data under the control of the processor.
A network data analysis function NWDAF, including:

a subscription module, configured to subscribe to the user location initiated by the access and mobility management function AMF, the network data analysis service of the user is provided by the NWDAF;

The service module is used to determine whether the network data analysis service can be continued to be provided according to the location notified by the AMF;

The reselection module is used to initiate NWDAF reselection if it is determined that it cannot continue to provide.
A computer-readable storage medium, wherein the computer-readable storage medium stores a computer program for executing the method of any one of claims 1 to 7.