Policy processing method of terminal equipment, AMF network element and communication equipment

Abstract

The embodiment of the invention discloses a strategy processing method of terminal equipment, an AMF network element and communication equipment, which are used for realizing communication of the terminal in a 5G local area network scene. The method provided by the embodiment of the invention comprises the following steps: an AMF network element receives a protocol processing unit session establishment request sent by terminal equipment UE; the AMF network element sends a policy association request to the PCF network element when a policy is not obtained for the UE in the process of processing the session establishment request of the protocol processing unit by the core network; the AMF network element receives an access and mobility management policy sent by the PCF network element; and the AMF sends the access and mobility management policies to the UE.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a policy processing method for a terminal device, an AMF network element, and a communication device. Background Art

[0002] 5G Local Area Network (5G LAN) uses 5G technology to "group" and "build groups" of terminals to form a LAN, thereby connecting the terminals in the area together into a "group". This not only facilitates data transmission between each other, but also saves external network exports.

[0003] However, in actual tests, it was found that many terminals in the 5G LAN scenario did not support the service selection function in the 5G LAN, resulting in the terminals being unable to communicate in the 5G LAN scenario. Summary of the invention

[0004] An embodiment of the present application provides a policy processing method for a terminal device, an AMF network element, and a communication device, which can send a mobile management policy to the terminal to enable the terminal to communicate in a 5G local area network scenario.

[0005] To solve the above technical problems, the present application provides the following technical solutions:

[0006] In a first aspect, an embodiment of the present application provides a policy processing method for a terminal device, the method being applied to an access and mobility management function AMF network element in a core network, the core network further comprising: a policy control function PCF network element, the method comprising:

[0007] The AMF network element receives a protocol processing unit session establishment request sent by a terminal device UE;

[0008] When the core network fails to obtain a policy for the UE during processing of the protocol processing unit session establishment request, the AMF network element sends a policy association request to the PCF network element;

[0009] The AMF network element receives the access and mobility management policy sent by the PCF network element;

[0010] The AMF sends the access and mobility management policy to the UE.

[0011] In combination with the first aspect, in a first possible implementation manner of the first aspect, before the AMF network element receives a protocol processing unit session establishment request sent by a terminal device UE, the method further includes:

[0012] The AMF network element receives a registration request sent by a terminal device UE;

[0013] The AMF network element determines, according to the registration request, whether the registration request includes a policy identifier of the UE;

[0014] When the registration request does not include the policy identifier of the UE, the following steps are triggered: the AMF network element receives a protocol processing unit session establishment request sent by the terminal device UE.

[0015] In combination with the first aspect, in a second possible implementation manner of the first aspect, the AMF network element determines, according to the registration request, whether the registration request includes a policy identifier of the UE, including:

[0016] The AMF network element obtains the payload container type carried in the registration request; wherein, if the payload container type is equal to 5, the registration request includes the policy identifier of the UE; if the payload container type is not equal to 5, the registration request does not include the policy identifier of the UE.

[0017] In combination with the first aspect, in a third possible implementation manner of the first aspect, the policy association request includes at least one of the following: subscription data of the UE, location information of the UE, or at least one virtual network group supported by the UE.

[0018] In combination with the first aspect, in a fourth possible implementation manner of the first aspect, the method further includes:

[0019] The AMF network element obtains the protocol processing unit session type requested by the UE according to the protocol processing unit session establishment request;

[0020] When the protocol processing unit session type is non-trusted or Ethernet, the following steps are triggered: when the core network does not obtain a policy for the UE during the process of processing the protocol processing unit session establishment request, the AMF network element sends a policy association request to the PCF network element.

[0021] In combination with the first aspect, in a fifth possible implementation manner of the first aspect, the method further includes:

[0022] When the AMF network element relocates and associates with the PCF, the following steps are triggered: when the core network fails to obtain a policy for the UE during processing of the protocol processing unit session establishment request, the AMF network element sends a policy association request to the PCF network element.

[0023] In combination with the first aspect, in a sixth possible implementation manner of the first aspect, the method further includes:

[0024] When the AMF network element determines that the UE moves from the evolved packet system EPS to the fifth generation evolved system 5GS, it triggers the execution of the following steps: when the core network does not obtain a policy for the UE during the process of processing the protocol processing unit session establishment request, the AMF network element sends a policy association request to the PCF network element.

[0025] In a second aspect, an embodiment of the present application further provides an access and mobility management function AMF network element, characterized in that the AMF network element is in a core network, and the core network further includes: a policy control function PCF network element, and the AMF network element includes:

[0026] A receiving module, used for receiving a protocol processing unit session establishment request sent by a terminal device UE;

[0027] A sending module, configured to send a policy association request to the PCF network element when no policy is obtained for the UE during the process of the core network processing the protocol processing unit session establishment request;

[0028] The receiving module is further used to receive the access and mobility management policy sent by the PCF network element;

[0029] The sending module is further used to send the access and mobility management policy to the UE.

[0030] In the second aspect of the present application, the constituent modules of the access and mobility management function AMF network element can also execute the steps described in the aforementioned first aspect and various possible implementation methods. For details, please refer to the aforementioned description of the first aspect and various possible implementation methods.

[0031] In a third aspect, an embodiment of the present application provides a computer-readable storage medium, wherein instructions are stored in the computer-readable storage medium, and when the computer-readable storage medium is run on a computer, the computer executes the method described in the first aspect above.

[0032] In a fourth aspect, an embodiment of the present application provides a computer program product comprising instructions, which, when executed on a computer, enables the computer to execute the method described in the first aspect above.

[0033] In the fifth aspect, an embodiment of the present application provides a communication device, which may include entities such as a terminal device or a chip, and the communication device includes: a processor, a memory; the memory is used to store instructions; the processor is used to execute the instructions in the memory, so that the communication device performs a method as described in any one of the above-mentioned first aspects.

[0034] In a sixth aspect, the present application provides a chip system, which includes a processor for implementing the functions involved in the above aspects, for example, sending or processing the data and / or information involved in the above methods. In one possible design, the chip system also includes a memory, which is used to store the necessary program instructions and data for the access and mobility management function AMF network element device. The chip system can be composed of chips, or it can include chips and other discrete devices.

[0035] It can be seen from the above technical solutions that the embodiments of the present application have the following advantages:

[0036] In an embodiment of the present application, the AMF network element receives a protocol processing unit session establishment request sent by the UE. During the process of the core network processing the protocol processing unit session establishment request, if the policy is not obtained for the UE, the AMF network element can actively send a policy association request to the PCF network element. Receive the access and mobility management policy sent by the PCF network element, and send the access and mobility management policy to the UE, so that when the core network does not send the access and mobility management policy to the UE, the access and mobility management policy can still be sent to the UE through the AMF network element. Enable the UE to communicate in the 5G local area network scenario based on the access and mobility management policy. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A schematic diagram of a process flow of a policy processing method for a terminal device provided in an embodiment of the present application;

[0038] Figure 2 A flowchart of another method for handling a terminal policy provided by an embodiment of the present application;

[0039] Figure 3 A flowchart of a policy processing method for a terminal device provided in an embodiment of the present application;

[0040] Figure 4 A schematic diagram of the composition structure of an access and mobility management function AMF network element provided in an embodiment of the present application. DETAILED DESCRIPTION

[0041] An embodiment of the present application provides a policy processing method for a terminal device, an AMF network element, and a communication device for sending a mobile management policy to a terminal to enable the terminal to communicate in a 5G local area network scenario.

[0042] The embodiments of the present application are described below in conjunction with the accompanying drawings.

[0043] 5G Local Area Network (5G LAN) uses 5G technology to "group" and "build groups" of terminals to form a LAN network, thereby connecting the terminals in the area together to form a "group". This not only facilitates data transmission between each other, but also saves external network exits. In the LAN, terminals find each other's terminals through the Media Access Control (MAC) address. If you enter and exit the external network, set up a router, and you can also achieve routing entry and exit through the IP address. This requires signing a service contract for the designated terminal (UE) number, so that they can be divided into the same or different virtual network groups (VN Group). Different VN groups can set different access policies to form different LANs. Therefore, the terminal must understand the group policy it is in before it can quickly execute different services. For example, the description of the user policy in the 24.501 Annex D section of the 3GPP protocol is that the UE actively obtains the user policy when registering, or the policy control function (PCF) on the network side is triggered during the policy update. However, it was found in the test that many terminals in the 5G network do not have the function of actively sending policies. As a result, the terminal cannot accurately locate the group policy supported by the core network where it is located, and cannot be fully used in the 5G LAN. This patent is based on this scenario, and is designed to actively send the VN group support capabilities of the adapted terminal by the core network in the 5G LAN, quickly inform the terminal, and facilitate the terminal to select services.

[0044] See also Figure 1 As shown, Figure 1 A schematic diagram of an interaction process between an Access and Mobility Management Function (AMF) network element, a Policy Control Function (PCF) network element and a terminal device (User Equipment, UE) provided in an embodiment of the present application, a policy processing method for a terminal device provided in an embodiment of the present application is applied to an access and mobility management function AMF network element in a core network, and the core network includes, in addition to the AMF network element, a policy control function PCF network element, and the policy processing method of the terminal device includes:

[0045] S101: The AMF network element receives a protocol processing unit session establishment request sent by a terminal device UE.

[0046] The terminal device UE sends a protocol data unit (PDU) session establishment request to the core network, and the AMF network element in the core network receives the protocol data unit session establishment request.

[0047] S102: When the core network fails to obtain a policy for the UE during the process of processing the protocol processing unit session establishment request, the AMF network element sends a policy association request to the PCF network element.

[0048] The core network processes the PDU session establishment request. After completing the processing of the PDU session request, the AMF determines whether the core network sends the policy to the UE during the processing of the PDU session establishment request. If the core network does not send the policy to the UE during the processing of the PDU session establishment request, it means that the PDU session establishment fails. The AMF network element can actively send a policy association request to the PCF network element to obtain the access and mobility management policy corresponding to the UE.

[0049] In an optional embodiment, the policy association request includes at least one of the following: subscription data of the UE, location information of the UE, or at least one virtual network group supported by the UE.

[0050] The policy association request includes the UE's subscription data, the UE's location information, and the ID of at least one virtual network group (VN GROUP) supported by the UE, so that the PCF network element can more accurately decide the attributes supported by the UE and send the policies supported by the UE to the AMF network element.

[0051] An example is given below. Table 1 shows the content included in the policy association request.

[0052]

[0053] Table 1

[0054] As shown in Table 1, the policy association request may also include the recipient identifier of the notification sent by the PCF, the location information of the UE, the permanent identifier of the UE, the universal public user identifier, the access type, and a list of IDs of virtual network groups supported by the UE.

[0055] S103: The AMF network element receives the access and mobility management policy sent by the PCF network element.

[0056] The PCF network element queries the access and mobility management policy corresponding to the UE based on the content carried in the policy association request, and sends the access and mobility management policy corresponding to the UE to the AMF network element, so that the PCF network element can accurately decide the attributes supported by the user. The AMF network element receives the access and mobility management policy corresponding to the UE sent by the PCF network element.

[0057] S104: AMF sends access and mobility management policy to the UE.

[0058] The AMF network element sends the received access and mobility management policies to the UE to actively deliver the access and mobility management policies.

[0059] The protocol processing unit session establishment request sent by the UE is received through the AMF network element. During the process of the core network processing the protocol processing unit session establishment request, if the policy is not obtained for the UE, the AMF network element can actively send a policy association request to the PCF network element. Receive the access and mobility management policy sent by the PCF network element, and send the access and mobility management policy to the UE, so that when the PDU session establishment fails, the access and mobility management policy can still be sent to the UE through the AMF network element. Enable the UE to quickly identify all supported VN groups and their service capabilities based on the access and mobility management policies without the need for changes, and configure them to the corresponding services, so as to achieve communication in the 5G LAN scenario and quickly find accurate routes.

[0060] In an optional embodiment, the above method further includes:

[0061] The AMF network element obtains the protocol processing unit session type requested by the UE according to the protocol processing unit session establishment request;

[0062] When the protocol processing unit session type is non-trusted or Ethernet, the following steps are triggered: when the core network does not obtain a policy for the UE during the process of processing the protocol processing unit session establishment request, the AMF network element sends a policy association request to the PCF network element.

[0063] An example is given below. The contents of the PDU session establishment message are shown in Table 2.

[0064]

[0065] Table 2

[0066] An example is given below, and the PDU session type value is shown in Table 3:

[0067]

[0068] Table 3

[0069] In the PDU session establishment process, AMF parses the PDU session establishment message, checks the PDU session type requested by the UE, and stores the PDU session type requested by the UE locally. When the PDU session type requested by the UE is non-trusted or Ethernet, if the core network does not enable the UE to obtain the policy during the processing of the PDU session establishment request, the AMF network element sends a policy association request to the PCF network element.

[0070] It should be noted that since the application scenarios of untrusted terminals are similar to those of 5G LAN, the embodiments of the present application can also be applied to untrusted terminals.

[0071] In an optional embodiment, the above method further includes:

[0072] When the AMF network element relocates the associated PCF, the following steps are triggered: when the core network does not obtain a policy for the UE during the process of processing the protocol processing unit session establishment request, the AMF network element sends a policy association request to the PCF network element.

[0073] When the PCF network element changes, the AMF network element needs to be relocated. When the AMF relocates and associates the PCF, if the core network does not enable the UE to obtain the policy during the processing of the PDU session establishment request, the AMF network element sends a policy association request to the PCF network element.

[0074] In an optional embodiment, the above method further includes:

[0075] When the AMF network element determines that the UE moves from the evolved packet system EPS to the fifth-generation evolved system 5GS, it triggers the execution of the following steps: When the core network does not obtain a policy for the UE during the process of processing the protocol processing unit session establishment request, the AMF network element sends a policy association request to the PCF network element.

[0076] When the UE moves from the evolved packet system EPS to the fifth generation evolved system 5GS, if the core network does not enable the UE to obtain the policy during the processing of the PDU session establishment request, the AMF network element sends a policy association request to the PCF network element.

[0077] like Figure 2 As shown, Figure 2 A schematic diagram of another interaction process between a mobility management function AMF network element, a policy control function PCF network element and a terminal device UE provided in an embodiment of the present application. The policy processing method of the terminal device provided in an embodiment of the present application includes applying the method to an access and mobility management function AMF network element in a core network, and the core network also includes: a policy control function PCF network element, and the method includes:

[0078] S201: The AMF network element receives a registration request sent by the terminal device UE.

[0079] The UE sends a registration request to the AMF network element, and the AMF network element receives the registration request sent by the UE.

[0080] An example is given below. Table 4 shows the content of the registration request message.

[0081]

[0082] Table 4

[0083] Table 4 shows the content of the registration request message, including the payload container type (Payload containertype) and the payload container context (Payload container).

[0084] The following are examples. Table 5 is a schematic illustration of the load container type values ​​provided in an embodiment of the present application.

[0085]

[0086] Table 5

[0087] S202: The AMF network element determines whether the registration request includes the UE's policy identifier based on the registration request.

[0088] In an optional embodiment, the AMF network element determines, according to the registration request, whether the registration request includes a policy identifier of the UE, including:

[0089] The AMF network element obtains the payload container type carried in the registration request; if the payload container type is equal to 5, the registration request includes the UE's policy identifier; if the payload container type is not equal to 5, the registration request does not include the UE's policy identifier.

[0090] Among them, the AMF network element determines whether the payload container type in the registration request is equal to 5. If the payload container type is equal to 5, the registration request contains the UE's policy identifier. In this scenario, the terminal device will trigger the acquisition of the policy. If the payload container type is not equal to 5, the registration request does not contain the UE's policy identifier. In this scenario, the AMF will actively trigger the acquisition of the policy, thereby realizing the judgment of whether the registration request contains the UE's policy identifier through the payload container type carried in the registration request.

[0091] S203: When the registration request does not include the UE's policy identifier, the following steps are triggered: the AMF network element receives the protocol processing unit session establishment request sent by the terminal device UE.

[0092] When the registration request does not contain the UE's policy identifier, the AMF network element receives the PDU session establishment request sent by the UE to facilitate the delivery of access and mobility management policies to the UE.

[0093] S204: When the core network fails to obtain a policy for the UE during the process of processing the protocol processing unit session establishment request, the AMF network element sends a policy association request to the PCF network element.

[0094] The specific implementation process of step S204 can be found in the above step S102, which will not be described in detail here.

[0095] S205: The AMF network element receives the access and mobility management policy sent by the PCF network element.

[0096] The specific implementation process of step S205 can be found in the above step S103, which will not be described in detail here.

[0097] S206: AMF sends access and mobility management policy to the UE.

[0098] The specific implementation process of step S206 can be found in the above step S104, which will not be described in detail here.

[0099] For ease of understanding, the above solution is explained below with an example:

[0100] like Figure 3 As shown, the AMF network element receives the registration request sent by the UE, and the AMF obtains the payload container type carried in the registration request. If the payload container type is not 5, it means that the registration request does not include the UE's policy identifier, and the AMF network element receives the PDU session establishment request sent by the UE. The AMF network element determines the type of the PDU session based on the PDU session response returned by the Radio Access Network (RAN). When the PDU session type is non-trusted or Ethernet, if the access and mobility management policy is not obtained for the UE during the core network's processing of the PDU session establishment request, the AMF network element sends a policy association request containing the UE's subscription data, the UE's location information, or at least one of the virtual network groups supported by the UE to the PCF network element. The AMF network element receives the access and mobility management policy returned by the PCF network element based on the policy association request, and sends the received access and mobility management policy to the UE. When the AMF receives the access and mobility management policy response returned by the UE, the AMF sends a message notification to the PCF. Therefore, when the PDU session establishment fails, the AMF network element actively sends the UE's access and mobility management policy to the UE. Since the access and mobility management policy includes the VN group supported by the UE, the UE can be configured to the corresponding service based on the supported VN group to achieve communication in the 5G LAN scenario.

[0101] like Figure 4As shown, the embodiment of the present application also provides an access and mobility management function AMF network element, the AMF network element is in the core network, and the core network also includes: a policy control function PCF network element, the AMF network element includes:

[0102] The receiving module 401 is used to receive a protocol processing unit session establishment request sent by a terminal device UE;

[0103] The sending module 402 is used to send a policy association request to the PCF network element when no policy is obtained for the UE during the process of the core network processing the protocol processing unit session establishment request;

[0104] The receiving module 401 is further used to receive the access and mobility management policy sent by the PCF network element;

[0105] The sending module 402 is further configured to send the access and mobility management policy to the UE.

[0106] In an optional embodiment, the AMF network element further includes: a judgment module;

[0107] The receiving module 401 is further configured to receive a registration request sent by a terminal device UE;

[0108] A judgment module, used to determine whether the registration request includes a policy identifier of the UE according to the registration request;

[0109] The sending module 402 is further used to trigger the execution of the following steps when the registration request does not include the UE's policy identifier: receiving a protocol processing unit session establishment request sent by the terminal device UE.

[0110] In an optional embodiment, the judgment module is specifically used to obtain the payload container type carried in the registration request; wherein, if the payload container type is equal to 5, the registration request includes the UE's policy identifier, and if the payload container type is not equal to 5, the registration request does not include the UE's policy identifier.

[0111] In an optional embodiment, the sending module 402 is also used to send a policy association request to the PCF network element when no policy is obtained for the UE during the process of the core network processing the protocol processing unit session establishment request; the policy association request includes at least one of the following: the UE's subscription data, the UE's location information, or at least one virtual network group supported by the UE.

[0112] In an optional embodiment, the AMF network element further includes: an acquisition module;

[0113] An acquisition module, configured to acquire a protocol processing unit session type requested by the UE according to a protocol processing unit session establishment request;

[0114] The sending module 402 is also used to trigger the execution of the following steps when the protocol processing unit session type is non-trusted or Ethernet: when no policy is obtained for the UE during the process of the core network processing the protocol processing unit session establishment request, send a policy association request to the PCF network element.

[0115] In an optional embodiment, the sending module 402 is also used to trigger the execution of the following steps when the AMF network element relocates the associated PCF: when no policy is obtained for the UE during the process of the core network processing the protocol processing unit session establishment request, a policy association request is sent to the PCF network element.

[0116] In an optional embodiment, the sending module 402 is also used to trigger the execution of the following steps when the AMF network element determines that the UE moves from the evolved packet system EPS to the fifth-generation evolved system 5GS: when no policy is obtained for the UE during the process of the core network processing the protocol processing unit session establishment request, a policy association request is sent to the PCF network element.

[0117] The AMF network element receives the protocol processing unit session establishment request sent by the UE. During the process of the core network processing the protocol processing unit session establishment request, if the policy is not obtained for the UE, the AMF network element can actively send a policy association request to the PCF network element. Receive the access and mobility management policy sent by the PCF network element, and send the access and mobility management policy to the UE, so that when the core network does not send the access and mobility management policy to the UE, the access and mobility management policy can still be sent to the UE through the AMF network element. Enable the UE to communicate in the 5G local area network scenario based on the access and mobility management policy.

[0118] An embodiment of the present application also provides a communication device, which is specifically an access and mobility management function AMF network element. The communication device includes: a processor, the processor is coupled to a memory, and the memory stores at least one computer program instruction. The at least one computer program instruction is loaded and executed by the processor so that the computer device implements the above-mentioned policy processing method for a terminal device.

[0119] An embodiment of the present application also provides a computer-readable storage medium, in which instructions are stored. When the computer-readable storage medium is run on a computer, the computer executes the above-mentioned policy processing method for a terminal device.

[0120] An embodiment of the present application also provides a computer program product including instructions, which, when executed on a computer, enables the computer to execute the above-mentioned policy processing method for a terminal device.

[0121] An embodiment of the present application also provides a communication device, which may include entities such as a terminal device or a chip, and the communication device includes: a processor, a memory; the memory is used to store instructions; the processor is used to execute the instructions in the memory, so that the communication device executes a policy processing method for a terminal device.

[0122] An embodiment of the present application also provides a chip system, which includes a processor for implementing the functions involved in the above-mentioned access and mobility management function AMF network element, for example, sending or processing the data and / or information involved in the above-mentioned method. In one possible design, the chip system also includes a memory, which is used to store the necessary program instructions and data for the access and mobility management function AMF network element device. The chip system can be composed of chips, and can also include chips and other discrete devices.

[0123] The terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and need not be used to describe a specific order or sequential order. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances, which is only to describe the distinction mode adopted by the objects of the same attributes when describing in the embodiments of the present application. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, so that the process, method, system, product or equipment comprising a series of units need not be limited to those units, but may include other units that are not clearly listed or inherent to these processes, methods, products or equipment.

Claims

1. A policy processing method for a terminal device, characterized in that: The method is applied to an access and mobility management function AMF network element in a core network, wherein the core network further comprises a policy control function PCF network element, and the method comprises: The AMF network element receives a protocol processing unit session establishment request sent by a terminal device UE; When the core network fails to obtain a policy for the UE during processing of the protocol processing unit session establishment request, the AMF network element sends a policy association request to the PCF network element; The AMF network element receives the access and mobility management policy sent by the PCF network element; The AMF sends the access and mobility management policy to the UE.

2. The method according to claim 1, characterized in that Before the AMF network element receives the protocol processing unit session establishment request sent by the terminal device UE, the method further includes: The AMF network element receives a registration request sent by a terminal device UE; The AMF network element determines, according to the registration request, whether the registration request includes a policy identifier of the UE; When the registration request does not include the policy identifier of the UE, the following steps are triggered: the AMF network element receives a protocol processing unit session establishment request sent by the terminal device UE.

3. The method according to claim 2, characterized in that The AMF network element determines, according to the registration request, whether the registration request includes a policy identifier of the UE, including: The AMF network element obtains the payload container type carried in the registration request; wherein, if the payload container type is equal to 5, the registration request includes the policy identifier of the UE; if the payload container type is not equal to 5, the registration request does not include the policy identifier of the UE.

4. The method according to claim 1, characterized in that: The policy association request includes at least one of the following: subscription data of the UE, location information of the UE, or at least one virtual network group supported by the UE.

5. The method according to any one of claims 1 to 4, characterized in that The method further comprises: The AMF network element obtains the protocol processing unit session type requested by the UE according to the protocol processing unit session establishment request; When the protocol processing unit session type is non-trusted or Ethernet, the following steps are triggered: when the core network does not obtain a policy for the UE during the process of processing the protocol processing unit session establishment request, the AMF network element sends a policy association request to the PCF network element.

6. The method according to any one of claims 1 to 4, characterized in that The method further comprises: When the AMF network element relocates and associates with the PCF, the following steps are triggered: when the core network fails to obtain a policy for the UE during processing of the protocol processing unit session establishment request, the AMF network element sends a policy association request to the PCF network element.

7. The method according to any one of claims 1 to 4, characterized in that The method further comprises: When the AMF network element determines that the UE moves from the evolved packet system EPS to the fifth generation evolved system 5GS, it triggers the execution of the following steps: when the core network does not obtain a policy for the UE during the process of processing the protocol processing unit session establishment request, the AMF network element sends a policy association request to the PCF network element.

8. An access and mobility management function AMF network element, characterized in that: The AMF network element is in the core network, and the core network further includes: a policy control function PCF network element, and the AMF network element includes: A receiving module, used for receiving a protocol processing unit session establishment request sent by a terminal device UE; A sending module, configured to send a policy association request to the PCF network element when no policy is obtained for the UE during the process of the core network processing the protocol processing unit session establishment request; The receiving module is further used to receive the access and mobility management policy sent by the PCF network element; The sending module is further used to send the access and mobility management policy to the UE.

9. A communication device, characterized in that: The communication device is specifically an access and mobility management function AMF network element, and the communication device includes: a processor, the processor is coupled to a memory, and the memory stores at least one computer program instruction, and the at least one computer program instruction is loaded and executed by the processor so that the computer device implements the method described in any one of claims 1-7.

10. A computer storage medium, characterized in that: Used to store a computer program, which, when executed, is used to implement the method according to any one of claims 1 to 7.

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