WO2019137555A1

WO2019137555A1 - Policy control function management method and device

Info

Publication number: WO2019137555A1
Application number: PCT/CN2019/071763
Authority: WO
Inventors: 周晓云; 朱进国
Original assignee: 中兴通讯股份有限公司
Priority date: 2018-01-15
Filing date: 2019-01-15
Publication date: 2019-07-18
Also published as: CN110048867A

Abstract

Disclosed is a policy control function (PCF) management method, comprising: a policy control function-selection function (PCF-SF) receives a session management control policy Npcf_SMPolicyControl_Get request message sent by an SMF, wherein the session management control policy request message carries a user identification and indication information Same PCF corresponding to a user equipment (UE); the PCF-SF determines, according to a correspondence between the UE and a PCF entity recorded in locally saved information, that a PCF entity has been selected for the UE; the PCF-SF selects, according to the indication information Same PCF, for the UE the recorded PCF entity corresponding to the UE. Also disclosed is a PCF management device.

Description

Policy control function management method and device

The present application claims priority to Chinese Patent Application No. 20181003704, the entire disclosure of which is hereby incorporated by reference.

Technical field

The present disclosure relates to the field of communications, for example, to a policy control function management method and apparatus.

Background technique

The industry is researching the 5th Generation mobile communication technology (5G) when the Access and Mobility Management Function (AMF) interacts with the Policy Control Function (PCF). The AMF sends a Network Function Discovery Request (NF Discovery Request) message to the Network Repository Function (NRF) to request a PCF entity. However, in some scenarios (such as roaming scenarios), due to network topology hiding or network configuration, the NRF returns to the AMF instead of the PCF address, but a proxy function. Thus, when the Session Management Function (SMF) sends a request message to the proxy function, the same PCF instance selected by the AMF cannot be found.

Summary of the invention

The present disclosure proposes a policy control function management method and apparatus to solve the problem that AMF and SMF cannot select the same PCF.

In an embodiment, the present disclosure provides a method for managing a policy control function, the method comprising:

The Policy Control Function-Select Function (PCF-SF) receives the session management control policy Npcf_SMPolicyControl_Get request message sent by the session management function SMF. The Npcf_SMPolicyControl_Get request message carries the user equipment (User Equipment, UE). Corresponding user identification and indication information Same PCF;

The PCF-SF determines that the PCF entity has been selected for the UE according to the correspondence between the UE and the policy control function PCF entity recorded in the locally saved information; according to the indication information Same PCF, the PCF-SF A PCF entity corresponding to the UE that has been recorded is selected for the UE.

In an embodiment, the present disclosure further provides a policy control function management method, where the method includes:

The network function function NRF receives the access and mobility management function AMF sends a network function to discover an NF discovery request message; wherein the NF discovery request message sent by the AMF carries a network function (NF) type parameter requirement, And the NF type parameter of the AMF itself;

The NRF returns an address or identification information of a policy control function-selection function PCF-SF corresponding to the NF discovery request message sent by the AMF to the AMF according to the received NF discovery request message sent by the AMF.

The access and mobility management function AMF sends an access and mobility management control policy Npcf_AMPolicyControl_Get request message to the policy control function-selection function PCF-SF; wherein the Npcf_AMPolicyControl_Get request message carries the user identifier corresponding to the user equipment UE;

The AMF receives the Npcf_AMPolicyControl_Get response message sent by the PCF-SF; the Npcf_AMPolicyControl_Get response message carries the access and mobility management control policy of the UE.

The session management function SMF sends a session management control policy Npcf_SMPolicyControl_Get request message to the policy control function-selection function PCF-SF; wherein the Npcf_SMPolicyControl_Get request message carries the user identifier corresponding to the user equipment UE;

The SMF receives the Npcf_SMPolicyControl_Get response message sent by the PCF-SF; the Npcf_SMPolicyControl_Get response message carries a Policy and Charging Control (PCC) policy corresponding to the UE.

In an embodiment, the present disclosure further provides a policy control function management apparatus, which is disposed on a policy control function-selection function PCF-SF, and the apparatus includes:

a receiving unit, configured to receive a session management control policy Npcf_SMPolicyControl_Get request message sent by the session management function SMF; wherein the Npcf_SMPolicyControl_Get request message carries a user identifier and indication information Same PCF corresponding to the user equipment UE;

a PCF entity determining unit, configured to determine that a PCF entity has been selected for the UE according to a correspondence between the UE and the policy control function PCF entity recorded in the locally saved information; and, according to the indication information Same PCF, The UE selects a recorded PCF entity corresponding to the UE.

In an embodiment, the present disclosure further provides a policy control function management apparatus, which is disposed on a network storage function NRF, and the apparatus includes:

a receiving unit, configured to receive a network function discovery NF discovery request message sent by the access and mobility management function AMF, where the NF discovery request message sent by the AMF carries a requirement of an NF type parameter, and the AMF itself NF type parameter;

a returning unit, configured to return, according to the received NF discovery request message sent by the AMF, a policy control function corresponding to the NF discovery request message sent by the AMF to the AMF, or an address or identifier information of the selection function PCF-SF .

In an embodiment, the present disclosure also provides a slight control function management device, which is disposed on the access and mobility management function AMF, and the device includes:

a requesting unit, configured to send an access and mobility management control policy Npcf_AMPolicyControl_Get request message to the policy control function-selection function PCF-SF; wherein the Npcf_AMPolicyControl_Get request message carries a user identifier corresponding to the UE;

The receiving unit is configured to receive an Npcf_AMPolicyControl_Get response message sent by the PCF-SF, where the Npcf_AMPolicyControl_Get response message carries an access and mobility management control policy of the UE.

In an embodiment, the present disclosure further provides a policy control function management apparatus, which is disposed on a session management function SMF, and the apparatus includes:

a requesting unit, configured to send a session management control policy Npcf_SMPolicyControl_Get request message to the policy control function-selection function PCF-SF; wherein the Npcf_SMPolicyControl_Get request message carries a user identifier corresponding to the UE;

The receiving unit is configured to receive an Npcf_SMPolicyControl_Get response message sent by the PCF-SF, where the Npcf_SMPolicyControl_Get response message carries a PCC policy corresponding to the UE.

In an embodiment, the present disclosure also provides a policy control function management apparatus including a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor executing the The method described in any of the above embodiments is implemented when the computer program is described.

DRAWINGS

The drawings in the embodiments of the present disclosure are described below, and the accompanying drawings are used to explain the present disclosure, and the present invention is not to be construed as limiting the scope of the disclosure.

1 is a schematic structural diagram of a 5G network in the related art;

2 is a schematic structural diagram of a policy control function management system of the present disclosure;

3 is a schematic flowchart of a method for managing a policy control function in an embodiment of the present disclosure;

4 is a schematic flowchart diagram of another method for managing a policy control function in an embodiment of the present disclosure;

FIG. 5 is a schematic flowchart of still another method for managing a policy control function in an embodiment of the present disclosure;

6 is a schematic flowchart of still another method for managing a policy control function in an embodiment of the present disclosure;

7 is a flowchart of acquiring PCF entity information by a PCF_SF in an embodiment of the present disclosure;

8 is a flowchart of a PCF_SF selecting a PCF for an AMF in a non-roaming scenario in an embodiment of the present disclosure;

9 is a flowchart of selecting, by a PCF_SF, a same PCF for an SMF in a non-roaming scenario in an embodiment of the present disclosure;

10 is a flowchart of roaming V-/home H-PCF_SF for roaming PCFV-PCF and home PCFH-PCF for AMF in a roaming scenario according to an embodiment of the present disclosure;

11 is a flowchart of selecting a V-PCF for a V-SMF by a V-PCF_SF in a locally-distributed Local Breakout roaming scenario according to an embodiment of the present disclosure;

12 is a flowchart of selecting, by the H-PCF_SF, the same H-PCF for the H-SMF in the home routed Home-routed roaming scenario in the embodiment of the present disclosure;

FIG. 13 is a schematic structural diagram of a policy control function management apparatus according to an embodiment of the present disclosure;

FIG. 14 is a schematic structural diagram of another policy control function management apparatus in an embodiment of the present disclosure;

15 is a schematic structural diagram of still another policy control function management apparatus in an embodiment of the present disclosure;

16 is a schematic structural diagram of still another policy control function management apparatus in an embodiment of the present disclosure;

FIG. 17 is a schematic structural diagram of still another policy control function management apparatus in an embodiment of the present disclosure.

Detailed ways

In order to facilitate the understanding of those skilled in the art, the present disclosure is described below in conjunction with the accompanying drawings, and is not intended to limit the scope of the disclosure. The embodiments and implementations in the present application can be combined with each other without conflict.

Embodiment 1

In an embodiment, FIG. 1 is a schematic diagram of a 5G architecture, and the functions of the included functional entities are as follows:

The base station (Radio Access Node, RAN) is configured to allocate air interface resources of the terminal access network and connection management of air interfaces.

The access and mobility management functions AMF are set to access authentication, authorization, and mobility management.

The session management function SMF is set to be responsible for session management and IP address allocation.

The User Plane Function (UPF) is a connection point of a Protocol Data Unit (PDU) session, and is set to route, forward, and perform policy execution of packet data.

The policy control function PCF is set as a policy decision.

The network storage function NRF is set to support the discovery of network functions.

Application Function (AF) is set to provide service information to the network at the application layer, and request the network to allocate resources for the application.

In the related art, the AMF and the SMF interact with the PCF) to obtain a policy for execution, and the AF requests the resource reservation directly or through the Network Exposure Function (NEF) to interact with the PCF. Generally, in a Public Land Mobile Network (PLMN), there are multiple PCFs. When the AMF wants to interact with the PCF, the AMF sends a Network Function Discovery Request (NF discovery request) message to the NRF, requesting a PCF entity, and the NRF provides the AMF with the address of the PCF entity according to the saved information (such as the Internet Protocol (Internet Protocol). IP) address or identity), and the AMF sends an associated service service request message to the PCF entity. Similarly, when the SMF is to interact with the PCF, the SMF sends a Network Function Discovery Request (NF discovery request) message to the NRF requesting a PCF entity, and the NRF provides the SMF with the address (such as an IP address or address) of the PCF entity according to the saved information. The SMF then sends a related service service request message to the PCF entity. If the SMF selects a PCF that is the same as the AMF according to the local policy, then the AMF first provides the AMF with the AMF selected by the SMF, and the SMF directly sends the relevant service service request message to the PCF.

In an embodiment, Nnssf, Nnef, Nnrf, Npcf, Nudm, Naf, Nausf, Namf, Nsmf in the figures are all service-based interfaces. In an embodiment, FIG. 1 further includes an Authentication Server Function (AUSF), a Network Slice Selection Function (NSSF), and a Unified Data Manager (UDM). In an embodiment, N1 in the drawing denotes a reference point between the UE and the AMF; N2 denotes a reference point between the RAN and the AMF; N3 denotes a reference point between the RAN and the UPF; and N4 denotes between the SMF and the UPF Reference point; N6 represents the reference point between the UPF and the data network (DN).

2 is a schematic structural diagram of a policy control function management system according to an embodiment of the present disclosure. As shown in FIG. 2, a PCF Selection Function (PCF-SF) is set to implement a PCF instance selection. .

Embodiment 2

In an embodiment, the present disclosure provides a policy control function management method, as shown in FIG. 3, including steps 3100 to 3300.

In step 3100, the policy control function-selection function PCF-SF receives the session management control policy Npcf_SMPolicyControl_Get request message sent by the session management function SMF; wherein the session management control policy request message carries the user identifier corresponding to the user equipment UE and Instructions for Same PCF.

In step 3200, the PCF-SF determines that the PCF entity has been selected for the UE according to the correspondence between the UE and the policy control function PCF entity recorded in the locally saved information.

In step 3300, according to the indication information Same PCF, the PCF-SF selects a recorded PCF entity corresponding to the UE for the UE.

In an embodiment, before the PCF-SF receives the Npcf_SMPolicyControl_Get request message sent by the SMF, the method further includes:

The PCF-SF receives an access and mobility management control policy Npcf_AMPolicyControl_Get request message sent by the access and mobility management function AMF, where the access and mobility management control policy request message carries the UE corresponding User ID;

If the PCF-SF determines that the PCF entity has not been selected for the UE according to the locally saved information, the PCF-SF selects a PCF entity for the UE, and records between the UE and the selected PCF entity. Correspondence.

In an embodiment, after the PCF-SF selects the recorded PCF entity corresponding to the UE for the UE, the method further includes:

Obtaining, by the PCF entity, a policy and a charging control PCC policy corresponding to the UE by using the PCF entity;

The PCF-SF returns an Npcf_SMPolicyControl_Get response message to the SMF, where the Npcf_SMPolicyControl_Get response message carries the PCC policy.

In an embodiment, the acquiring a PCC policy corresponding to the UE includes:

The PCF-SF sends the Npcf_SMPolicyControl_Get request message to the selected PCF entity, where the user identifier carried in the Npcf_SMPolicyControl_Get request message is such that the PCF entity is corresponding to the user identifier according to the user identifier. The UE formulates a PCC policy;

The PCF-SF receives the Npcf_AMPolicyControl_Get response message returned by the PCF entity; the Npcf_AMPolicyControl_Get response message returned by the PCF entity carries a PCC policy formulated for the UE.

In an embodiment, after the PCF-SF selects a PCF entity for the UE, the method further includes:

Obtaining, by the PCF entity, the access and mobility management control policy corresponding to the UE by using the PCF entity;

The PCF-SF returns an Npcf_AMPolicyControl_Get response message to the AMF; the Npcf_AMPolicyControl_Get response message carries the access and mobility management control policy.

In an embodiment, the acquiring the access and mobility management control policy corresponding to the UE includes:

The PCF-SF sends the Npcf_AMPolicyControl_Get request message to the selected PCF entity, where the user identifier carried in the Npcf_AMPolicyControl_Get request message is such that the PCF entity is corresponding to the user identifier according to the user identifier. The UE formulates an access and mobility management control strategy;

The PCF-SF receives the Npcf_AMPolicyControl_Get response message returned by the PCF entity; the Npcf_AMPolicyControl_Get response message returned by the PCF entity carries an access and mobility management control policy formulated for the UE.

In an embodiment, the method further includes:

The PCF-SF sends a subscription entity notification to the network storage function NRF;

The PCF-SF receives the notification information related to the new PCF instance sent by the NRF.

In an embodiment, the present disclosure further provides a policy control function management method, as shown in FIG. 4, including step 4100 and step 4200.

In step 4100, the network storage function NRF receives the network function discovery NF discovery request message sent by the access and mobility management function AMF; wherein the NF discovery request message sent by the AMF carries the requirement of the network function NF type parameter, And the NF type parameter of the AMF itself.

In step 4200, the NRF returns an address of a policy control function-selection function PCF-SF corresponding to the NF discovery request message sent by the AMF to the AMF according to the received NF discovery request message sent by the AMF. Or identification information.

In an embodiment, the method further includes:

Receiving, by the NRF, a subscription entity notification sent by the PCF-SF;

The NRF sends a notification information related to the new PCF instance to the PCF-SF if the policy control function PCF instance is updated.

In an embodiment, the method further includes:

The NRF receives an NF discovery request message sent by the session management function SMF, where the NF discovery request message sent by the SMF carries a requirement of an NF type parameter, and an NF type parameter of the SMF itself;

The NRF returns an address or identification information of the PCF-SF corresponding to the NF discovery request message sent by the SMF to the SMF according to the received NF discovery request message sent by the SMF.

In an embodiment, the embodiment of the present disclosure further provides a policy control function management method, as shown in FIG. 5, including step 5100 and step 5200.

In step 5100, the access and mobility management function AMF sends an access and mobility management control policy Npcf_AMPolicyControl_Get request message to the policy control function-selection function PCF-SF; wherein the Npcf_AMPolicyControl_Get request message carries the user equipment UE corresponding User ID.

In step 5200, the AMF receives the Npcf_AMPolicyControl_Get response message sent by the PCF-SF; the Npcf_AMPolicyControl_Get response message carries the access and mobility management control policy of the UE.

In an embodiment, before the sending, by the AMF, the Npcf_AMPolicyControl_Get request message to the PCF-SF, the method further includes:

The AMF sends a network function discovery NF discovery request message to the network storage function NRF; wherein the NF discovery request message carries a requirement of an NF type parameter, and an NF type parameter of the AMF itself;

The AMF receives the reply message of the NRF to the NF discovery request message, where the reply message carries the address or identification information of the PCF-SF corresponding to the NF discovery request message, so that the AMF is based on the The address or identification information of the PCF-SF sends an Npcf_AMPolicyControl_Get request message to the PCF-SF corresponding to the address or the identification information of the PCF-SF.

In an embodiment, the present disclosure further includes a policy control function management method, as shown in FIG. 6, including step 6100 and step 6200.

In step 6100, the session management function SMF sends a session management control policy Npcf_SMPolicyControl_Get request message to the policy control function-selection function PCF-SF. The Npcf_SMPolicyControl_Get request message carries the user identifier corresponding to the user equipment UE.

In step 6200, the SMF receives the Npcf_SMPolicyControl_Get response message sent by the PCF-SF; the Npcf_SMPolicyControl_Get response message carries the policy and the charging control PCC policy corresponding to the UE.

In an embodiment, before the sending, by the SMF, the Npcf_SMPolicyControl_Get request message to the PCF-SF, the method further includes:

The SMF sends a network function discovery NF discovery request message to the network storage function NRF; wherein the NF discovery request message carries a requirement of an NF type parameter, and an NF type parameter of the SMF itself;

The SMF receives the reply message of the NRF to the NF discovery request message, where the reply message carries the address or identification information of the PCF-SF corresponding to the NF discovery request message, so that the SMF is based on the SMF The address or identification information of the PCF-SF sends an Npcf_SMPolicyControl_Get request message to the PCF-SF corresponding to the address or the identification information of the PCF-SF.

Embodiment 3

Referring to FIG. 7, an embodiment of the present disclosure provides a method for acquiring PCF entity information by a PCF_SF (ie, PCF-SF), where the method includes:

Step 301: A subscription relationship is established between the PCF_SF and the NRF, that is, the subscription entity notifies that, after a new PCF instance is created, the NRF notifies the PCF_SF of the information of the new PCF instance. The subscription information of the PCF_SF may carry slice information (Slice Information) and/or data network information (such as Data Network Name (DNN)) of the PSF_SF service.

Step 302: The NRF obtains instance information of the PCF.

NRF learned that a new PCF instance was created. For example, NRF can obtain PCF instance information from Network Management and Orchestration (MANO) in Network Function Virtualization (NFV). The information can include PCF. The address of the instance (such as IP address or identity), the slice information of the PCF service, the data network information, and the processing capability.

Step 303: The NRF provides the obtained instance information of the PCF to the PCF_SF according to the subscription information before the PCF_SF.

Referring to FIG. 8, the present disclosure provides a policy control function management method, where the method includes:

Step 401: After receiving the trigger, the AMF sends an NF discovery request to the NRF, where the message carries the requirement of the type parameter of the NF, and the MF type parameter of the AMF itself. The message may also carry slice information and the like.

Step 402: The NRF authorizes the request. Based on the local configuration of the NRF, the NRF determines whether the AMF allows the discovery of the PCF.

Step 403: If the NRF determines that the AMF allows the PCF to be found, the NRF returns the entry point of the PCF, that is, the address or identification information of the PCF_SF to the AMF.

Step 404: The AMF sends an Npcf_AMPolicyControl_Get request message to the PCF_SF, where the message carries the user identifier, and may also carry the slice information.

Step 405: The PCF_SF determines that the PCF has not been selected for the user according to the locally saved information, and the PCF_SF selects a PCF for the UE, and saves a correspondence (user identifier, PCF address or identifier).

Step 406: The PCF_SF sends an Npcf_AMPolicyControl_Get request message to the selected PCF, where the message carries the user identifier, and may also carry the slice information.

Step 407: After formulating an access and mobility management control policy for the user by using the identifier or the like, the PCF returns a response message to the PCF_SF. It is possible for the PCF to interact with the UDM to obtain the user's subscription information.

Step 408: The PCF_SF returns an Npcf_AMPolicyControl_Get response message to the AMF. The AMF performs an access and mobility management control policy based on the returned Npcf_AMPolicyControl_Get response message.

Referring to FIG. 9, the present disclosure proposes a policy control function management method, and the method includes: FIG. 9 is a flowchart of selecting the same PCF as the AMF for the SMF on the basis of FIG.

Step 501: After receiving the trigger, the SMF sends an NF discovery request to the NRF, where the message carries the requirement of the type parameter of the NF (ie, PCF), and the MF type parameter of the SMF itself. The message may also carry slice information and the like.

Step 502: The NRF authorizes the request. Based on the local configuration, the NRF determines whether the SMF allows the discovery of PCF.

Step 503: If the NRF determines that the SMF allows the PCF to be found, the NRF returns the entry point of the PCF, that is, the address or identification information of the PCF_SF to the SMF.

Step 504: The SMF sends an Npcf_SMPolicyControl_Get request message to the PCF_SF, where the message carries the user identifier, and the DNN may also carry the slice information and the IP address allocated for the UE. The local policy of the SMF needs to select the same PCF, so the SMF carries the indication information (Same PCF Indication) in the request message.

Step 505: The PCF_SF determines that the PCF has been selected for the user according to the locally saved information, and selects the same PCF according to the Same PCF Indication. The PCF_SF sends an Npcf_SMPolicyControl_Get request message to the PCF selected in FIG. 8 , where the message carries the user identifier, and the DNN may also carry the slice information and the IP address allocated for the UE. At the same time, PCF_SF saves a correspondence (user ID, DNN, UE IP address, PCF address or identifier).

Step 506: The PCF_SF sends an Npcf_SMPolicyControl_Get request message to the selected PCF, where the message carries the user identifier, and the message carries the user identifier, the DNN, and may also carry the slice information and the IP address allocated for the UE.

Step 507: After formulating the PCC policy according to the information such as the identifier, the PCF returns a response message to the PCF_SF. It is possible for the PCF to interact with the UDM to obtain the user's subscription information.

Step 508: The PCF_SF returns an Npcf_SMPolicyControl_Get response message to the SMF. The SMF implements a PCC policy.

FIG. 10 is a flowchart of AMF selecting a roaming PCF (Virtual-PCF, V-PCF) and a home PCF (Home-PCF, H-PCF) in a roaming scenario. In an embodiment, "V-" indicates roaming and "H-" indicates attribution or attribution.

Step 601: After receiving the trigger, the AMF sends an NF discovery request to the V-NRF, where the message carries the requirement of the type parameter of the NF, and the MF type parameter of the AMF itself. The message may also carry slice information and the like.

Step 602: The V-NRF authorizes the request. V-NRF is based on local configuration, and V-NRF determines whether AMF allows discovery of PCF.

Step 603: If the V-NRF determines that the AMF allows the PCF to be found, the V-NRF returns the entry point of the V-PCF, that is, the address or identification information of the V-PCF_SF to the AMF.

Step 604: The AMF sends an Npcf_AMPolicyControl_Get request message to the V-PCF_SF, where the message carries the user identifier, and may also carry the slice information.

Step 605: The V-PCF_SF determines that the V-PCF has not been selected for the user according to the locally saved information, and the V-PCF_SF selects a V-PCF for the UE, and saves a corresponding relationship (user identifier, V-PCF address or identifier). ).

Step 606: The V-PCF_SF sends an Npcf_AMPolicyControl_Get request message to the selected V-PCF, where the message carries the user identifier, and may also carry the slice information.

Step 607: The V-PCF determines that the user is a roaming user according to the identifier, and the V-PCF sends an NF discovery request to the H-NRF of the user network according to the roaming protocol and the user identifier, and the message carries the type parameter requirement of the NF (ie, PCF). , AMF's own NF type parameters. The message may also carry slice information and the like.

Step 608: The H-NRF authorizes the request. H-NRF is based on local configuration, and H-NRF determines whether AMF allows discovery of PCF.

Step 609: If the H-NRF determines that the AMF allows the PCF to be found, the H-NRF returns the entry point of the H-PCF, that is, the address or identification information of the H-PCF_SF to the V-PCF.

Step 610: The V-PCF sends an Npcf_AMPolicyControl_Get request message to the H-PCF_SF, where the message carries the user identifier, and may also carry the slice information.

Step 611: The H-PCF_SF determines that the HV-PCF has not been selected for the user according to the locally saved information, and the H-PCF_SF selects an H-PCF for the UE, and saves a corresponding relationship (user identifier, H-PCF address or identifier). ).

Step 612: The H-PCF_SF sends an Npcf_AMPolicyControl_Get request message to the selected H-PCF, where the message carries the user identifier, and may also carry the slice information.

Step 613: After the H-PCF formulates an access and mobility management control policy for the user, the H-PCF returns a response message to the H-PCF_SF. It is possible for the H-PCF to interact with the UDM to obtain the user's subscription information.

Step 614: The H-PCF_SF returns an Npcf_AMPolicyControl_Get response message to the V-PCF.

Step 615: The V-PCF returns a response message to the V-PCF_SF.

Step 616, the V-PCF_SF returns a response message to the AMF. The AMF performs the policy in the reply message.

FIG. 11 is a flow chart of the V-SMF selecting the same PCF as the AMF in the local Breakout roaming scenario based on FIG. 10.

Step 701: The V-SMF receives the trigger (the trigger may be a session management request message from the AMF), and sends an NF discovery request to the V-NRF, where the message carries the requirement of the type parameter of the NF (ie, PCF), and the V-SMF itself NF type parameter. The message may also carry slice information and the like.

Step 702: The V-NRF authorizes the request. V-NRF is based on local configuration, and V-NRF determines whether V-SMF allows discovery of PCF.

Step 703: If the V-NRF determines that the V-SMF allows the PCF to be found, the V-NRF returns the entry point of the PCF, that is, the address or identification information of the V-PCF_SF to the V-SMF.

Step 704: The V-SMF sends an Npcf_SMPolicyControl_Get request message to the PCF_SF, where the message carries the user identifier, and the DNN may also carry the slice information and the IP address allocated for the UE. The local policy of the V-SMF needs to select the same PCF, so the V-SMF carries the indication information (Same PCF Indication) in the request message.

Step 705: The V-PCF_SF judges that the PCF has been selected for the user according to the locally saved information, and selects the same PCF according to the Same PCF Indication. The V-PCF_SF sends an Npcf_SMPolicyControl_Get request message to the V-PCF selected in FIG. 10, where the message carries the user identifier, and the DNN may also carry the slice information and the IP address allocated for the UE. At the same time, V-PCF_SF saves a correspondence (user ID, DNN, UE IP address, V-PCF address or identifier).

Step 706: The V-PCF_SF sends an Npcf_SMPolicyControl_Get request message to the selected V-PCF, where the message carries the user identifier, and the message carries the user identifier, and the DNN may also carry the slice information and the IP address allocated for the UE.

Step 707: The V-PCF returns a response message to the V-PCF_SF after formulating the PCC policy based on the information such as the identifier. It is possible for the V-PCF to interact with the UDM to obtain the user's subscription information.

Step 708: The V-PCF_SF returns an Npcf_SMPolicyControl_Get response message to the SMF. The SMF implements a PCC policy.

12 is a flow chart of the H-SMF selecting the same PCF as the AMF in the Home-routed roaming scenario on the basis of FIG.

Step 801: The H-SMF receives the trigger (the trigger may be a session management request message from the V-SMF), and then sends an NF discovery Request to the H-NRF, where the message carries the requirement of the type parameter of the NF (ie, PCF), H- The MF type parameter of the SMF itself. The message may also carry slice information and the like.

Step 802: The H-NRF authorizes the request. The H-NRF is based on the local configuration, and the H-NRF determines whether the H-SMF allows the discovery of the PCF.

Step 803: If the H-NRF determines whether the H-SMF allows the PCF to be found, the H-NRF returns the entry point of the PCF, that is, the address or identification information of the H-PCF_SF to the H-SMF.

Step 804: The H-SMF sends an Npcf_SMPolicyControl_Get request message to the PCF_SF, where the message carries the user identifier, and the DNN may also carry the slice information and the IP address allocated for the UE. The local policy of the H-SMF is to select the same PCF, so the V-SMF carries the indication information (Same PCF Indication) in the request message.

Step 805: The H-PCF_SF judges that the PCF has been selected for the user according to the locally saved information, and selects the same PCF according to the Same PCF Indication. The H-PCF_SF sends an Npcf_SMPolicyControl_Get request message to the H-PCF selected in FIG. 10, where the message carries the user identifier, and the DNN may also carry the slice information and the IP address allocated for the UE. At the same time, V-PCF_SF saves a correspondence (user ID, DNN, UE IP address, V-PCF address or identifier).

Step 806: The H-PCF_SF sends an Npcf_SMPolicyControl_Get request message to the selected H-PCF, where the message carries the user identifier, and the message carries the user identifier, the DNN, and may also carry the slice information and the IP address allocated for the UE.

Step 807: The H-PCF returns a response message to the H-PCF_SF after formulating the PCC policy based on the information such as the identifier. It is possible for the H-PCF to interact with the UDM to obtain the user's subscription information.

Step 808: The H-PCF_SF returns an Npcf_SMPolicyControl_Get response message to the SMF. The SMF implements a PCC policy.

Embodiment 4

Based on the same or similar concepts as the above embodiments, the embodiment of the present disclosure further provides a policy control function management method, where the method includes:

Step 11: The PCF-SF receives the Npcf_AMPolicyControl_Get request message sent by the access and mobility management function AMF, where the message carries the user identifier corresponding to the user.

Step 12: The PCF-SF determines, according to the locally saved information, whether the PCF has been selected for the UE corresponding to the request message.

Step 13. In the case that the policy control function PCF entity has not been selected for the UE, the PCF-SF selects a PCF entity for the UE, and records a correspondence between the UE and the PCF entity.

Step 14: The PCF-SF obtains a corresponding access and mobility management control policy by using the PCF entity.

In an embodiment, step 14 includes:

Step 141: The PCF-SF sends an Npcf_AMPolicyControl_Get request message to the selected PCF, where the message carries a user identifier, so that the PCF establishes access and mobility management control according to the user identifier for the corresponding user equipment. Strategy

Step 142: The PCF-SF receives an Npcf_AMPolicyControl_Get response message returned by the PCF, where the response message carries an access and mobility management control policy defined for the user equipment.

Step 15: The PCF-SF returns the Npcf_AMPolicyControl_Get response information to the AMF, where the response information carries the access and mobility management control policy.

Step 16: The PCF-SF receives the Npcf_SMPolicyControl_Get request message sent by the SMF, where the message carries the user identifier and the indication information Same PCF corresponding to the user equipment UE.

Step 17: The PCF-SF determines, according to the locally saved information, whether the PCF has been selected for the UE. The locally stored information records the correspondence between the UE and the PCF entity.

Step 18: In the case that the PCF has been selected for the UE, the PCF-SF selects a corresponding PCF entity in the record for the UE, and acquires a corresponding PCC policy by using the PCF entity.

In an embodiment, obtaining the corresponding PCC policy by using the PCF entity in step 18 includes:

Step 181: The PCF-SF sends an Npcf_SMPolicyControl_Get request message to the selected PCF. The user identifier carried in the message causes the PCF to formulate a PCC policy for the corresponding user equipment according to the user identifier.

Step 182: The PCF-SF receives the Npcf_AMPolicyControl_Get response message returned by the PCF, where the response message carries a PCC policy formulated for the user equipment.

Step 19: The PCF-SF returns an Npcf_SMPolicyControl_Get response message to the SMF, where the response message carries a PCC policy.

The policy control function management method provided by the embodiment of the present disclosure further includes:

The PCF-SF sends a subscription entity notification to the NRF; and,

Step 21: The network storage function NRF receives the NF discovery request message sent by the access and mobility management function AMF. The NF discovery request message sent by the AMF carries the requirement of the NF type parameter, and the NF of the AMF itself. Type parameter.

Step 22: The NRF returns, according to the received NF discovery request message sent by the AMF, the address or identifier information of the policy control function-selection function PCF-SF corresponding to the NF discovery request message sent by the AMF to the AMF. Step 23: The NRF receives the NF discovery request message sent by the session management function SMF. The NF discovery request message sent by the SMF carries the requirement of the NF type parameter and the NF type parameter of the SMF itself.

Step 24: The NRF returns an address or identifier information of the PCF-SF corresponding to the NF discovery request message sent by the SMF to the SMF according to the received NF discovery request message sent by the SMF.

The NRF receives the PCF-SF to notify the sending subscription entity;

The NRF sends a notification information related to the new PCF instance to the PCF-SF in the case that the PCF instance is updated.

Step 31: The AMF sends an NF discovery request message to the network storage function NRF. The message carries the requirement of the NF type parameter and the NF type parameter of the AMF itself.

Step 32: The AMF receives the NF discovery request message of the NRF reply, where the request message carries the address or identification information of the corresponding PCF_SF, so that the AMF sends the address or the identifier information of the PCF_SF to the corresponding PCF- The SF sends an Npcf_AMPolicyControl_Get request message.

Step 33: The AMF sends an Npcf_AMPolicyControl_Get request message to the PCF-SF, where the message carries the user identifier corresponding to the user;

Step 34: The AMF receives the Npcf_AMPolicyControl_Get response message sent by the PCF-SF; the response information carries the access and mobility management control policy.

Step 41: The SMF sends an NF discovery request message to the network storage function NRF. The message carries the requirement of the NF type parameter and the NF type parameter of the SMF itself.

Step 42: The SMF receives the NF discovery request message of the NRF reply, where the request message carries the address or the identifier information of the corresponding PCF_SF, so that the SMF sends the address or the identifier information of the PCF_SF to the corresponding PCF- The SF sends an Npcf_SMPolicyControl_Get request message.

Step S43: The SMF sends an Npcf_SMPolicyControl_Get request message to the policy control function-selection function PCF-SF. The message carries the user identifier corresponding to the user.

Step 44: The SMF receives the Npcf_SMPolicyControl_Get response information sent by the PCF-SF, where the response information carries a PCC policy corresponding to the user.

Embodiment 5

Based on the same or similar concepts as the above embodiments, the embodiment of the present disclosure further provides a policy control function management apparatus, which is disposed on the policy control function-selection function PCF-SF. As shown in FIG. 13, the apparatus includes:

The first receiving unit 1310 is configured to receive the session management control policy Npcf_SMPolicyControl_Get request message sent by the session management function SMF; wherein the Npcf_SMPolicyControl_Get request message carries the user identifier and the indication information Same PCF corresponding to the user equipment UE;

The PCF entity determining unit 1320 is configured to determine that the PCF entity has been selected for the UE according to the correspondence between the UE and the policy control function PCF entity recorded in the locally saved information; and, according to the indication information Same PCF, In the case that the PCF has been selected for the UE, the recorded PCF entity corresponding to the UE is selected for the UE.

In an embodiment, the first receiving unit is further configured to receive an Npcf_AMPolicyControl_Get request message sent by the access and mobility management function AMF before receiving the access and mobility management control policy Npcf_SMPolicyControl_Get request message sent by the SMF; The Npcf_AMPolicyControl_Get request message carries the user identifier corresponding to the UE;

The PCF entity determining unit is further configured to determine, according to locally saved information, that the PCF entity is not selected for the UE, the PCF-SF selects a PCF entity for the UE, and records the UE and the selected Correspondence between PCF entities;

In an embodiment, the apparatus further includes a first return unit, the first return unit is configured to

After the PCF-SF selects the recorded PCF entity corresponding to the UE, the PCF entity obtains a PCC policy corresponding to the UE by using the PCF entity;

And returning the Npcf_SMPolicyControl_Get response message to the SMF, where the Npcf_SMPolicyControl_Get response message carries a PCC policy.

In an embodiment, the first return unit is set to:

The PCF-SF sends an Npcf_SMPolicyControl_Get request message to the selected PCF entity, where the user identifier carried in the Npcf_SMPolicyControl_Get request message is such that the PCF entity formulates a PCC policy according to the user identifier as a UE corresponding to the user identifier. ;

In an embodiment of the disclosure, the apparatus further includes a policy return unit; the policy return unit is configured to:

After the PCF-SF selects a PCF entity for the UE, acquiring, by the PCF entity, an access and mobility management control policy corresponding to the UE;

Returning the Npcf_AMPolicyControl_Get response message to the AMF; the Npcf_AMPolicyControl_Get response message carries the access and mobility management control policy.

In an embodiment, the policy return unit is set to:

Sending the Npcf_AMPolicyControl_Get request message to the selected PCF entity; wherein the user identifier carried in the Npcf_AMPolicyControl_Get request message is such that the PCF entity establishes an access and according to the user identifier as a UE corresponding to the user identifier. Mobility management control strategy;

Receiving an Npcf_AMPolicyControl_Get response message returned by the PCF entity; the Npcf_AMPolicyControl_Get response message returned by the PCF entity carries an access and mobility management control policy formulated for the UE.

In the embodiment of the disclosure, the device further includes:

An entity management unit, configured to send a subscription entity notification to the NRF; and receive notification information related to the new PCF instance sent by the NRF.

Based on the same or similar concepts as the above embodiments, the embodiment of the present disclosure further provides a policy control function management apparatus, which is disposed on the network storage function NRF. As shown in FIG. 14, the apparatus includes:

The second receiving unit 1410 is configured to receive an NF discovery request message sent by the access and mobility management function AMF, where the NF discovery request message sent by the AMF carries a requirement of an NF type parameter, and the AMF itself NF type parameter;

The second returning unit 1420 is configured to return, according to the received NF discovery request message sent by the AMF, a policy control function corresponding to the NF discovery request message sent by the AMF to the AMF, and select an address of the function PCF-SF. Or identification information.

In the embodiment of the disclosure, the device further includes:

An instance management unit configured to receive a subscription entity notification sent by the PCF-SF; and, in case the PCF instance has an update, send the notification information related to the new PCF instance to the PCF-SF.

In the embodiments of the present disclosure, wherein:

The second receiving unit is further configured to receive an NF discovery request message sent by the session management function SMF, where the NF discovery request message sent by the SMF carries a requirement of an NF type parameter, and an NF type parameter of the SMF itself ;

The second returning unit is further configured to return, according to the received NF discovery request message sent by the SMF, the address or the identification information of the PCF-SF corresponding to the NF discovery request message sent by the SMF to the SMF.

Based on the same or similar concepts as the above embodiments, the embodiment of the present disclosure further provides a policy control function management apparatus, which is disposed on the access and mobility management function AMF. As shown in FIG. 15, the apparatus includes:

The first requesting unit 1510 is configured to send an access and mobility management control policy Npcf_AMPolicyControl_Get request message to the policy control function-selection function PCF-SF; wherein the Npcf_AMPolicyControl_Get request message carries the user identifier corresponding to the user equipment UE;

The third receiving unit 1520 is configured to receive an Npcf_AMPolicyControl_Get response message sent by the PCF-SF, where the Npcf_AMPolicyControl_Get response message carries an access and mobility management control policy of the UE.

In the embodiment of the present disclosure, the first requesting unit is further configured to send an NF discovery request message to the network storage function NRF before sending the Npcf_AMPolicyControl_Get request message to the PCF-SF; wherein the NF discovery request message carries the NF type The requirements of the parameters, and the NF type parameters of the AMF itself;

The third receiving unit is further configured to receive the NRF response message to the NF discovery request message, where the reply message carries the address or identification information of the corresponding PCF-SF, so that the AMF is based on the PCF- The address or identification information of the SF sends an Npcf_AMPolicyControl_Get request message to the PCF-SF corresponding to the address or the identification information of the PCF-SF.

Based on the same or similar concepts as the above embodiments, the embodiment of the present disclosure further provides a policy control function management apparatus, which is disposed on the session management function SMF. As shown in FIG. 16, the apparatus includes:

The second requesting unit 1610 is configured to send a session management control policy Npcf_SMPolicyControl_Get request message to the policy control function-selection function PCF-SF; wherein the Npcf_SMPolicyControl_Get request message carries a user identifier corresponding to the user equipment;

The fourth receiving unit 1620 is configured to receive an Npcf_SMPolicyControl_Get response message sent by the PCF-SF, where the Npcf_SMPolicyControl_Get response message carries a PCC policy corresponding to the user equipment.

In the embodiment of the present disclosure, the second requesting unit is further configured to send an NF discovery request message to the network storage function NRF before the SMF sends the Npcf_SMPolicyControl_Get request message to the PCF-SF; wherein the NF discovery request message is carried in the message There is a requirement for an NF type parameter, and an NF type parameter of the SMF itself;

The fourth receiving unit is further configured to receive a reply message of the NRF to the NF discovery request message, where the reply message carries an address or identifier information of the PCF-SF corresponding to the NF discovery request message, so that The SMF sends an Npcf_SMPolicyControl_Get request message to the PCF-SF corresponding to the address or the identification information of the PCF-SF according to the address or the identification information of the PCF-SF.

In an embodiment, an embodiment of the present disclosure further provides a policy control function management apparatus, as shown in FIG. 17, including a memory 1710, a processor 1720, and a computer program stored on the memory 1710 and operable on the processor 1720. The method of any one of the embodiments provided by the embodiments of the present disclosure is implemented when the processor 1720 executes the computer program.

In one embodiment, the present disclosure also provides a storage medium having stored thereon a computer program that, when executed by a processor, implements the method of any of the embodiments of the present disclosure.

Storage medium - any one or more types of memory devices or storage devices. The term "storage medium" is intended to include: a mounting medium, a read-only memory (ROM), such as a Compact Disc Read-Only Memory (CD-ROM), a floppy disk or a tape device; Or random access memory, such as Dynamic Random Access Memory (DRAM), (Double Data Rate Random Access Memory, DDR RAM), Static Random Access Memory (SRAM), extended data Output Data Output Random Access Memory (EDO RAM), Rambus Random Access Memory (Rambus RAM), etc.; non-volatile memory such as flash memory, magnetic media (such as hard disk or Optical storage); registers or other similar types of memory elements, and the like. The storage medium may also include other types of memory or a combination thereof.

Compared with the related art, when the AMF sends a request message to the proxy function, the PCF_SF selects a corresponding PCF instance for the AMF, records the correspondence between the UE and the PCF instance, and sends a request to the proxy function in the SMF. In the message, if the UE has recorded the corresponding PCF instance, the PCF instance corresponding to the already recorded UE is selected for the SMF, thereby ensuring that the same PCF instance as the AMF is found when the SMF sends the request message to the proxy function.

Claims

A method for managing policy control functions, including:

The policy control function-selection function PCF-SF receives the session management control policy Npcf_SMPolicyControl_Get request message sent by the session management function SMF; wherein the session management control policy request message carries the user identifier and the indication information Same PCF corresponding to the user equipment UE;

The PCF-SF determines that the PCF entity has been selected for the UE according to the correspondence between the UE and the policy control function PCF entity recorded in the locally saved information; according to the indication information Same PCF, the PCF-SF A PCF entity corresponding to the UE that has been recorded is selected for the UE.
The method according to claim 1, before the receiving, by the PCF-SF, the Npcf_SMPolicyControl_Get request message sent by the SMF, the method further includes:

The PCF-SF receives an access and mobility management control policy Npcf_AMPolicyControl_Get request message sent by the access and mobility management function AMF, where the access and mobility management control policy request message carries the UE corresponding User ID;

If the PCF-SF determines that the PCF entity has not been selected for the UE according to the locally saved information, the PCF-SF selects a PCF entity for the UE, and records between the UE and the selected PCF entity. Correspondence.
The method according to claim 1, after the PCF-SF selects the recorded PCF entity corresponding to the UE for the UE, the method further includes:

Obtaining, by the PCF entity, a policy and a charging control PCC policy corresponding to the UE by using the PCF entity;

The PCF-SF returns an Npcf_SMPolicyControl_Get response message to the SMF, where the Npcf_SMPolicyControl_Get response message carries the PCC policy.
The method of claim 3, wherein the obtaining a PCC policy corresponding to the UE comprises:

The PCF-SF sends the Npcf_SMPolicyControl_Get request message to the selected PCF entity, where the user identifier carried in the Npcf_SMPolicyControl_Get request message is such that the PCF entity is corresponding to the user identifier according to the user identifier. The UE formulates a PCC policy;

The PCF-SF receives the Npcf_AMPolicyControl_Get response message returned by the PCF entity; the Npcf_AMPolicyControl_Get response message returned by the PCF entity carries a PCC policy formulated for the UE.
The method according to claim 2, after the PCF-SF selects a PCF entity for the UE, the method further includes:

Obtaining, by the PCF entity, the access and mobility management control policy corresponding to the UE by using the PCF entity;

The PCF-SF returns an Npcf_AMPolicyControl_Get response message to the AMF; the Npcf_AMPolicyControl_Get response message carries the access and mobility management control policy.
The method according to claim 5, wherein the obtaining the access and mobility management control policy corresponding to the UE comprises:

The PCF-SF sends the Npcf_AMPolicyControl_Get request message to the selected PCF entity: wherein the user identifier carried in the Npcf_AMPolicyControl_Get request message is such that the PCF entity is corresponding to the user identifier according to the user identifier. The UE formulates an access and mobility management control strategy;

The PCF-SF receives the Npcf_AMPolicyControl_Get response message returned by the PCF entity; the Npcf_AMPolicyControl_Get response message returned by the PCF entity carries an access and mobility management control policy formulated for the UE.
The method of any one of claims 1 to 6, further comprising:

The PCF-SF sends a subscription entity notification to the network storage function NRF;

The PCF-SF receives the notification information related to the new PCF instance sent by the NRF.
A method for managing policy control functions, including:

The network function function NRF receives the access and mobility management function AMF sends a network function discovery NF discovery request message; wherein the NF discovery request message sent by the AMF carries the requirement of the network function NF type parameter, and the AMF itself NF type parameter;

The NRF returns an address or identification information of a policy control function-selection function PCF-SF corresponding to the NF discovery request message sent by the AMF to the AMF according to the received NF discovery request message sent by the AMF.
The method of claim 8 further comprising:

Receiving, by the NRF, a subscription entity notification sent by the PCF-SF;

The NRF sends the notification information related to the new PCF instance to the PCF-SF if the policy control function PCF instance is updated.
The method of claim 8 further comprising:

The NRF receives an NF discovery request message sent by the session management function SMF, where the NF discovery request message sent by the SMF carries a requirement of an NF type parameter, and an NF type parameter of the SMF itself;

The NRF returns an address or identification information of the PCF-SF corresponding to the NF discovery request message sent by the SMF to the SMF according to the received NF discovery request message sent by the SMF.
A method for managing policy control functions, including:

The access and mobility management function AMF sends an access and mobility management control policy Npcf_AMPolicyControl_Get request message to the policy control function-selection function PCF-SF; wherein the Npcf_AMPolicyControl_Get request message carries the user identifier corresponding to the user equipment UE;

The AMF receives the Npcf_AMPolicyControl_Get response message sent by the PCF-SF; the Npcf_AMPolicyControl_Get response message carries the access and mobility management control policy of the UE.
The method according to claim 11, before the sending, by the AMF, the Npcf_AMPolicyControl_Get request message to the PCF-SF, the method further includes:

The AMF sends a network function discovery NF discovery request message to the network storage function NRF; wherein the NF discovery request message carries a requirement of an NF type parameter, and an NF type parameter of the AMF itself;

The AMF receives the reply message of the NRF to the NF discovery request message, where the reply message carries the address or identification information of the PCF-SF corresponding to the NF discovery request message, so that the AMF is based on the The address or identification information of the PCF-SF sends an Npcf_AMPolicyControl_Get request message to the PCF-SF corresponding to the address or the identification information of the PCF-SF.
A method for managing policy control functions, including:

The session management function SMF sends a session management control policy Npcf_SMPolicyControl_Get request message to the policy control function-selection function PCF-SF; wherein the Npcf_SMPolicyControl_Get request message carries the user identifier corresponding to the user equipment UE;

The SMF receives the Npcf_SMPolicyControl_Get response message sent by the PCF-SF; the Npcf_SMPolicyControl_Get response message carries the policy and the charging control PCC policy corresponding to the UE.
The method according to claim 13, before the sending, by the SMF, the Npcf_SMPolicyControl_Get request message to the PCF-SF, the method further includes:

The SMF sends a network function discovery NF discovery request message to the network storage function NRF; wherein the NF discovery request message carries a requirement of an NF type parameter, and an NF type parameter of the SMF itself;

The SMF receives the reply message of the NRF to the NF discovery request message, where the reply message carries the address or identification information of the PCF-SF corresponding to the NF discovery request message, so that the SMF is based on the SMF The address or identification information of the PCF-SF sends an Npcf_SMPolicyControl_Get request message to the PCF-SF corresponding to the address or the identification information of the PCF-SF.
A policy control function management device is disposed on the policy control function-selection function PCF-SF, including:

a receiving unit, configured to receive a session management control policy Npcf_SMPolicyControl_Get request message sent by the session management function SMF; wherein the Npcf_SMPolicyControl_Get request message carries a user identifier and indication information Same PCF corresponding to the user equipment UE;

a PCF entity determining unit, configured to determine that a PCF entity has been selected for the UE according to a correspondence between the UE and the policy control function PCF entity recorded in the locally saved information; and, according to the indication information Same PCF, The UE selects a recorded PCF entity corresponding to the UE.
The apparatus according to claim 15, wherein said receiving unit is further configured to receive an access and mobility management control policy Npcf_AMPolicyControl_Get request sent by the access and mobility management function AMF before receiving the Npcf_SMPolicyControl_Get request message sent by the SMF. a message, where the Npcf_AMPolicyControl_Get request message carries a user identifier corresponding to the UE;

The PCF entity determining unit is further configured to: when determining that the PCF entity has not been selected for the UE according to locally saved information, select a PCF entity for the UE, and record between the UE and the selected PCF entity Correspondence relationship.
The apparatus of claim 15 further comprising a return unit; said return unit being configured to:

After the PCF-SF selects the recorded PCF entity corresponding to the UE, the PCF entity acquires a policy and a charging control PCC policy corresponding to the UE;

And returning the Npcf_SMPolicyControl_Get response message to the SMF, where the Npcf_SMPolicyControl_Get response message carries the PCC policy.
The apparatus of claim 17 wherein said return unit is configured to:

The PCF-SF sends the Npcf_SMPolicyControl_Get request message to the selected PCF entity, where the user identifier carried in the Npcf_SMPolicyControl_Get request message is such that the PCF entity is corresponding to the user identifier according to the user identifier. The UE formulates a PCC policy;

The PCF-SF receives the Npcf_AMPolicyControl_Get response message returned by the PCF entity; the Npcf_AMPolicyControl_Get response message returned by the PCF entity carries a PCC policy formulated for the UE.
The apparatus of claim 16, further comprising a policy return unit; the policy return unit is configured to:

After the PCF-SF selects a PCF entity for the UE, acquiring, by the PCF entity, an access and mobility management control policy corresponding to the UE;

Returning the Npcf_AMPolicyControl_Get response message to the AMF; the Npcf_AMPolicyControl_Get response message carries the access and mobility management control policy.
The apparatus of claim 19, wherein the policy return unit is set to:

Transmitting the Npcf_AMPolicyControl_Get request message to the selected PCF entity; wherein the user identifier carried in the Npcf_AMPolicyControl_Get request message is configured to enable the PCF entity to establish an access and a UE corresponding to the user identifier according to the user identifier. Mobility management control strategy;

Receiving an Npcf_AMPolicyControl_Get response message returned by the PCF entity; the Npcf_AMPolicyControl_Get response message returned by the PCF entity carries an access and mobility management control policy formulated for the UE.
The apparatus according to any one of claims 15 to 20, further comprising:

An entity management unit, configured to send a subscription entity notification to the network storage function NRF; and receive notification information related to the new PCF instance sent by the NRF.
A policy control function management device is disposed on the network storage function NRF, including:

a receiving unit, configured to receive a network function discovery NF discovery request message sent by the access and mobility management function AMF, where the NF discovery request message sent by the AMF carries a requirement of a network function NF type parameter, and the AMF Its own NF type parameter;

a returning unit, configured to return, according to the received NF discovery request message sent by the AMF, a policy control function corresponding to the NF discovery request message sent by the AMF to the AMF, or an address or identifier information of the selection function PCF-SF .
The apparatus of claim 22, further comprising:

And an instance management unit, configured to receive the subscription entity notification sent by the PCF-SF; and send the notification information related to the new PCF instance to the PCF-SF if the policy control function PCF instance is updated.
The device of claim 22 wherein:

The receiving unit is further configured to receive an NF discovery request message sent by the session management function SMF, where the NF discovery request message sent by the SMF carries a requirement of an NF type parameter, and an NF type parameter of the SMF itself;

The returning unit is further configured to return, according to the received NF discovery request message sent by the SMF, the address or the identification information of the PCF-SF corresponding to the NF discovery request message sent by the SMF to the SMF.
A policy control function management device is provided on the access and mobility management function AMF, including:

a requesting unit, configured to send an access and mobility management control policy Npcf_AMPolicyControl_Get request message to the policy control function-selection function PCF-SF; wherein the Npcf_AMPolicyControl_Get request message carries a user identifier corresponding to the user equipment UE;

The receiving unit is configured to receive an Npcf_AMPolicyControl_Get response message sent by the PCF-SF, where the Npcf_AMPolicyControl_Get response message carries an access and mobility management control policy of the UE.
The apparatus of claim 25, wherein the requesting unit is further configured to send a network function discovery NF discovery request message to the network storage function NRF before transmitting the Npcf_AMPolicyControl_Get request message to the PCF-SF; wherein the NF discovery request The message carries the requirement of the NF type parameter, and the NF type parameter of the AMF itself;

The receiving unit is further configured to receive a reply message of the NRF to the NF discovery request message, where the reply message carries an address or identifier information of a PCF-SF corresponding to the NF discovery request message, so that the The AMF sends an Npcf_AMPolicyControl_Get request message to the PCF-SF corresponding to the address or the identification information of the PCF-SF according to the address or the identification information of the PCF-SF.
A policy control function management device is disposed on the session management function SMF, and includes:

a requesting unit, configured to send a session management control policy Npcf_SMPolicyControl_Get request message to the policy control function-selection function PCF-SF; wherein the Npcf_SMPolicyControl_Get request message carries a user identifier corresponding to the user equipment UE;

The receiving unit is configured to receive an Npcf_SMPolicyControl_Get response message sent by the PCF-SF, where the Npcf_SMPolicyControl_Get response message carries a policy and a charging control PCC policy corresponding to the UE.
The apparatus according to claim 27, wherein the requesting unit is further configured to send a network function discovery NF discovery request message to the network storage function NRF before the SMF sends an Npcf_SMPolicyControl_Get request message to the PCF-SF; The NF discovery request message carries a requirement of an NF type parameter, and an NF type parameter of the SMF itself;

The receiving unit is further configured to receive a reply message of the NRF to the NF discovery request message, where the reply message carries an address or identifier information of a PCF-SF corresponding to the NF discovery request message, so that the The SMF sends an Npcf_SMPolicyControl_Get request message to the PCF-SF corresponding to the address or the identification information of the PCF-SF according to the address or the identification information of the PCF-SF.
A policy control function management apparatus includes a memory, a processor, and a computer program stored on the memory and operable on the processor, wherein the processor executes the computer program as claimed in claim 1 The method of any one of -7, 8-10, 11-12 or 13-14.