Method for updating ue policy, hss, amf, and storage medium

Abstract

This disclosure provides a method for updating a UE policy, an HSS, an AMF (Application Function), and a storage medium. The method includes: the HSS receiving first UE policy update information corresponding to the UE sent by a UDM (User Device); wherein the UDM generates the first UE policy update information based on the adjustment information of the first UE policy in the 5G network; the HSS updating and storing a second UE policy corresponding to the first UE policy based on the first UE policy update information; and the HSS distributing the updated second UE policy to the UE when the UE switches from the 5G network or moves to the EPC (Electronic Processing Network) network. This disclosure can solve the problem of UE policy asynchrony in 4G and 5G networks, enabling the UE to obtain UE policies flexibly adjusted by the PCF even in the 4G network, maintaining policy consistency under the interoperability architecture; it has wide applicability and can provide users with flexible policy scheduling.

Description

Technical Field

[0001] This invention relates to the field of communication technology, and in particular to a method for updating UE policies, HSS, AMF, and storage media. Background Technology

[0002] UE policies can take various forms, such as URSP (User Equipment Routing Selection Policy). URSP guides the terminal to select a suitable route for specific traffic, such as choosing a DNN (Data Network Name), an existing session, a new session, or non-3GPP access. UE policies can be pre-configured on the terminal or dynamically adjusted and distributed to the terminal by the PCF (Policy Control Function) of the 5GC (5G Core) based on network conditions. Currently, UE policies have been extended to 4G networks. However, under the current communication mechanism, when users access the network via 4G, they can only use the pre-configured policies on the terminal side. The network side cannot make dynamic adjustments, making it difficult to ensure the consistency of UE policies across 4G / 5G networks and increasing the difficulty of data network maintenance. Furthermore, when users switch between 4G and 5G networks, they may use asynchronous UE policies, affecting the user experience. Summary of the Invention

[0003] In view of this, one technical problem to be solved by the present invention is to provide a method for updating UE policies, HSS, AMF, and storage medium.

[0004] According to a first aspect of this disclosure, a method for updating a UE policy is provided, comprising: a Home Subscriber Server (HSS) receiving first UE policy update information corresponding to a User Equipment (UE) sent by a Unified Subscriber Management (UDM) device; wherein the UDM generates the first UE policy update information based on adjustment information of the first UE policy in a 5G network; the HSS updates and stores a second UE policy corresponding to the first UE policy based on the first UE policy update information; and the HSS distributes the updated second UE policy to the UE when the UE switches from the 5G network or moves to an EPC network.

[0005] Optionally, the step of sending the updated second UE policy to the UE includes: the HSS sending the updated second UE policy to the Mobility Management Entity (MME); and the MME sending the updated second UE policy to the UE through a base station.

[0006] Optionally, the HSS receiving UE policy update information corresponding to the UE sent by the UDM device includes: the HSS receiving first UE policy update information corresponding to the UE sent by the UDM device through the SBI interface.

[0007] Optionally, the Access and Mobility Management Function (AMF) receives adjustment information of the first UE policy in the 5G network sent by the Policy Control Function (PCF); the AMF sends the adjustment information of the first UE policy in the 5G network to the UDM.

[0008] Optionally, if the HSS determines that the first UE policy update information contains first information in the 5G network, it converts the first information into the corresponding second information in the EPC network; or, if the UDM device determines that the adjustment information of the first UE policy in the 5G network contains the first information, it converts the first information into the second information; or, if the UE determines that the updated second UE policy contains the first information, it converts the first information into the second information.

[0009] According to a second aspect of this disclosure, a method for updating a UE policy is provided, comprising: an Access and Mobility Management Function (AMF) sending adjustment information of a first UE policy in a 5G network to a Unified Subscriber Management (UDM) device; the UDM generating first UE policy update information based on the adjustment information of the first UE policy in the 5G network and sending it to a Home Subscriber Server (HSS), so that the HSS updates and stores a second UE policy corresponding to the first UE policy based on the first UE policy update information.

[0010] Optionally, the AMF receives adjustment information of the first UE policy in the 5G network sent by the Policy Control Function (PCF).

[0011] Optionally, the HSS may send the updated second UE policy to the UE when the UE switches from the 5G network or moves to the EPC network.

[0012] Optionally, the step of sending the updated second UE policy to the UE includes: the HSS sending the updated second UE policy to the Mobility Management Entity (MME); and the MME sending the updated second UE policy to the UE through a base station.

[0013] Optionally, the HSS receives the first UE policy update information corresponding to the UE sent by the UDM device through the SBI interface.

[0014] According to a third aspect of this disclosure, a Home Subscriber Server (HSS) is provided, comprising: an update information receiving module, configured to receive first UE policy update information corresponding to a User Equipment (UE) sent by a Unified User Management Device (UDM); wherein the UDM generates the first UE policy update information based on adjustment information of the first UE policy in a 5G network; a UE policy adjustment module, configured to update and store a second UE policy corresponding to the first UE policy based on the first UE policy update information; and a UE policy delivery module, configured to deliver the updated second UE policy to the UE when the UE switches from the 5G network or moves to an EPC network.

[0015] Optionally, the UE policy delivery module is used to send the updated second UE policy to the Mobility Management Entity (MME); wherein the MME sends the updated second UE policy to the UE through a base station.

[0016] Optionally, the update information receiving module is used to receive the first UE policy update information corresponding to the UE sent by the UDM device through the SBI interface.

[0017] Optionally, the UE policy adjustment module is configured to convert the first information into the corresponding second information in the EPC network if it is determined that the first UE policy update information contains first information in the 5G network.

[0018] According to a fourth aspect of this disclosure, an HSS is provided, comprising: a memory; and a processor coupled to the memory, the processor being configured to perform the method described above based on instructions stored in the memory.

[0019] According to a fifth aspect of this disclosure, an Access and Mobility Management Function (AMF) is provided, comprising: an information sending module, configured to send adjustment information of a first UE policy in a 5G network to a Unified Subscriber Management (UDM) device; wherein the UDM generates first UE policy update information based on the adjustment information of the first UE policy in the 5G network and sends it to a Home Subscriber Server (HSS), so that the HSS updates and stores a second UE policy corresponding to the first UE policy based on the first UE policy update information.

[0020] Optionally, the information receiving module is used to receive the adjustment information of the first UE policy in the 5G network sent by the policy control function PCF.

[0021] According to a sixth aspect of this disclosure, an AMF is provided, comprising: a memory; and a processor coupled to the memory, the processor being configured to perform the method described above based on instructions stored in the memory.

[0022] According to the seventh aspect of this disclosure, a UE policy update system is provided, comprising: HSS as described above and AMF as described above.

[0023] According to an eighth aspect of this disclosure, a computer-readable storage medium is provided that stores computer instructions which are executed by a processor using the method described above.

[0024] This disclosure presents a UE policy update method, HSS, AMF, and storage medium, proposing a technical solution for terminals to receive dynamic UE policy updates in 4G networks. This solution addresses the issue of UE policy asynchrony between 4G and 5G networks. Without adding new interfaces, it utilizes the existing HSS-UDM interoperability architecture, requiring minimal equipment modification and being easy to implement. It enables UEs to obtain flexibly adjusted UE policies via PCF even in 4G networks, maintaining policy consistency across the interoperability architecture. With broad applicability, it provides users with flexible policy scheduling, fully utilizing network resources to deliver a superior service experience while reducing network maintenance costs and risks, thus improving user experience. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a flowchart illustrating one embodiment of the UE policy update method according to the present disclosure;

[0027] Figure 2 This is a flowchart illustrating another embodiment of the UE policy update method according to the present disclosure;

[0028] Figure 3 This is a flowchart illustrating yet another embodiment of the UE policy update method according to the present disclosure;

[0029] Figure 4 This is a schematic diagram of a module according to an embodiment of the HSS of this disclosure;

[0030] Figure 5 This is a schematic diagram of a module according to another embodiment of the HSS of this disclosure;

[0031] Figure 6 This is a schematic diagram of a module according to an embodiment of the AMF of this disclosure;

[0032] Figure 7 This is a schematic diagram of a module according to another embodiment of the AMF of this disclosure;

[0033] Figure 8 This is a schematic diagram of a module of a communication system according to an embodiment of the present disclosure. Detailed Implementation

[0034] The present disclosure will now be described more fully with reference to the accompanying drawings, which illustrate exemplary embodiments of the present disclosure. The technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present disclosure, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present disclosure without creative effort are within the scope of protection of the present disclosure.

[0035] The terms "first" and "second" used in the following text are only used to describe the differences between the two and have no other special meaning.

[0036] Figure 1 This is a flowchart illustrating an embodiment of the UE policy update method according to this disclosure, as shown below. Figure 1 As shown:

[0037] Step 101: The HSS (Home Subscriber Server) receives the first UE policy update information corresponding to the UE (User Equipment) sent by the UDM (Unified Data Management) device.

[0038] In one embodiment, the UDM generates first UE policy update information based on the adjustment information of the first UE policy in the 5G network. The first UE policy can be URSP, etc. The adjustment information of the first UE policy in the 5G network includes: modification information corresponding to the policy content in the first UE policy, newly added policy content, etc.; the adjustment information can also be all the information of the new first UE policy. The first UE policy update information generated by the UDM includes modification information corresponding to the policy content in the first UE policy, newly added policy content, etc.; the first UE policy update information can also include all the information of the new first UE policy.

[0039] Step 102: The HSS updates the second UE policy corresponding to the first UE policy based on the first UE policy update information and stores it.

[0040] In one embodiment, the HSS stores a second UE policy corresponding to the first UE policy. After receiving the first UE policy update information, the second UE policy is updated and stored so that the contents of the first UE policy and the second UE policy are the same.

[0041] Step 103: When the UE switches from the 5G network or moves to the EPC (Evolved Packet Core) network, the HSS sends the updated second UE policy to the UE.

[0042] In one embodiment, the 5G network can be a 5GC network, etc. The HSS sends the updated second UE policy to the MME (Mobility Management Entity), and the MME sends the updated second UE policy to the UE through the base station. The UE then performs corresponding processing based on the updated second UE policy.

[0043] In one embodiment, the AMF (Access and Mobility Management function) receives adjustment information of the first UE policy in the 5G network from the PCF, and then sends the adjustment information of the first UE policy in the 5G network to the UDM. The HSS receives UE policy update information corresponding to the UE from the UDM device through the SBI interface.

[0044] In current communication standards, UE policies are pre-configured in the terminal. When a UE accesses the 5G network, the PCRF can dynamically adjust the UE policy. When a user accesses a 4G network, if the 4G network does not have an ANDSF (Access Network Discovery and Selection Function), the user can only use the pre-configured UE policy in the terminal and cannot receive dynamic updates to the UE policy. When the UE switches to the EPC network, because the 4G policy element PCRF does not have a corresponding UE policy adjustment function, the UE policy used in the 4G network will be inconsistent with the UE policy used in the 5G network.

[0045] This disclosed method for updating UE policies provides a technical solution for terminals to receive dynamic UE policy updates in 4G networks, resolving the issue of UE policy asynchrony between 4G and 5G networks. When the PCF dynamically adjusts the UE policy, the modified policy information is sent to the AMF according to existing communication standards. The AMF then synchronizes the update to the HSS via the UDM, utilizing the SBI service interface between the UDM and HSS. When the UE accesses the 4G network, the HSS transmits the update to the base station via the MME, ultimately delivering it to the UE. The UE can obtain the same / equivalent UE policy in both 4G and 5G networks.

[0046] In one embodiment, if the HSS determines that the first UE policy update information contains first information in the 5G network, it converts the first information into the corresponding second information in the EPC network; or, if the UDM device determines that the adjustment information of the first UE policy in the 5G network contains the first information, it converts the first information into the second information; or, if the UE determines that the updated second UE policy contains the first information, it converts the first information into the second information.

[0047] After receiving the UE policy from the PCF, the AMF notifies the HSS via the UDM. Dynamically updated UE policies are sent to the UE in the EPS via the HSS, MME, and eNodeB. The UDM, HSS, or UE is responsible for translating (converting) some information between the 5GS (5G system) and EPS to ensure that the UE policy updated by the PCF in the 5G system can be successfully executed in the EPS system. The information that needs to be converted between 5GS and EPS is shown in Table 1 below:

[0048] 5GS system EPS system SUPI IMSI DNN APN Application descriptor OSId and OSAppId IP descriptor Dest.IP 3Tuple Domain descriptor Dest.FQDN or domain name …… ……

[0049] Table 1-5 shows the information that needs to be converted in GS and EPS.

[0050] In one embodiment, UE policy updates in the HSS can be implemented after the UE accesses the 5GC and establishes a UE Policy Association. If the UE initially accesses the EPC, the PCF cannot establish a UE policy association, and therefore, UE policy updates cannot be implemented. For example, operator A has both an EPC network and a 5G network, and the mobile phone number corresponding to UE1 belongs to a large customer B of operator A. Operator A sets a first UE policy for UE1 belonging to large customer B in the 5G network and a second UE policy for UE1 in the EPC network.

[0051] The first UE policy is a URSP policy, for example, the policy content of the first UE policy includes "When the traffic is for application C, send this traffic to server D". The content of the second UE policy is the same as the policy content of the first UE policy. When UE1 initially accesses the 5G network, when the first UE policy in the 5G network is adjusted, the AMF receives the adjustment information of the first UE policy in the 5G network sent by the PCF. The adjustment information can be the policy content added or modified for the first UE policy or a new first UE policy. For example, the policy content of the first UE policy "When the traffic is for application C, send this traffic to server D" is modified to "When the traffic is for application C, send this traffic to server E".

[0052] The AMF sends the adjustment information of the first UE policy in the 5G network to the UDM. The UDM generates the first UE policy update information based on the adjustment information of the first UE policy in the 5G network. For example, the first UE policy update information includes information indicating that "when the traffic is application C, send this traffic to server D" is adjusted to "when the traffic is application C, send this traffic to server E".

[0053] The HSS receives UE policy update information corresponding to the UE from the UDM device via the SBI interface. Based on the first UE policy update information, the HSS updates and stores the second UE policy corresponding to the first UE policy, that is, it modifies the policy content in the second UE policy from "when the traffic is application C, send this traffic to server D" to "when the traffic is application C, send this traffic to server E".

[0054] When UE1 switches from the 5G network or moves to the EPC network, the HSS sends the updated second UE policy to the MME; the MME then sends the updated second UE policy to UE1 via the base station. UE1 forwards traffic according to the updated second UE policy. For example, when UE1 determines that the received traffic belongs to application C, it sends this traffic to server D.

[0055] Figure 2 This is a flowchart illustrating another embodiment of the UE policy update method according to this disclosure, as shown below. Figure 2 As shown:

[0056] Step 201: The AMF and PCF establish a UE policy association. After establishing the UE policy association, the AMF can receive the UE policy adjustment information in the 5G network sent by the PCF.

[0057] Step 202: After the UE policy association is established, if the PCF adjusts the UE policy or establishes a new UE policy based on changes in network status, the PCF sends the adjustment information of the UE policy in the 5G network to the AMF.

[0058] Step 203: AMF sends the UE policy adjustment information in the 5G network to UDM. HSS receives the UE policy update information corresponding to the UE sent by UDM through the SBI interface and performs policy update processing.

[0059] Since there is no direct connection between the AMF and the HSS, after the PCF sends the UE policy adjustment information in the 5G network to the AMF, the AMF needs to send the UE policy adjustment information in the 5G network to the UDM. The UDM generates UE policy update information based on the adjustment information and sends it to the HSS through the SBI interface between the UDM and the HSS. The HSS updates the second UE policy corresponding to the first UE policy based on the UE policy update information and stores it.

[0060] Step 204: The UE switches from the 5GC network to the EPC network or moves from the idle state of 5GS to EPS according to the existing standard procedures.

[0061] Step 205: The updated UE policy is sent to the UE via HSS, MME, and eNodeB. Subsequent UE actions follow existing standard specifications.

[0062] If the UE policy association in the original PCF is not deleted during the UE's switch from 5GC to EPC in step 204, the PCF can continue to adjust the UE policy of the UE according to the network and continue to send it to the UE connected to 4G.

[0063] Most operators' networks coexist with 4G and 5G networks. In current technology, UE policy adjustments under 4G networks are not flexible enough, leading to inconsistencies in the same policy content (parameters) between 4G and 5G networks. This increases the difficulty of network maintenance and may lead to serious network incidents. For example, URSP policies can select specific data networks for specific applications. If users randomly use different data networks for the same application under 4G and 5G networks, it will cause unnecessary problems for the configuration and monitoring of the data network / bearer network. Furthermore, PCF can flexibly allocate more suitable UE policies based on big data analysis results such as NWDAF.

[0064] The UE policy update method disclosed herein is based on the existing 4G / 5G interoperability architecture and basic procedures. It requires minimal equipment modification and is relatively easy to implement. It enables UEs to obtain UE policies that can be flexibly adjusted by the PCF in 4G networks, maintaining policy consistency under the interoperability architecture. It can provide users with flexible policy scheduling, make full use of network resources to provide a better service experience, and reduce network maintenance costs and risks.

[0065] Figure 3 This is a flowchart illustrating yet another embodiment of the UE policy update method according to this disclosure, as shown below. Figure 3 As shown:

[0066] Step 301: The AMF sends the adjustment information of the first UE policy in the 5G network to the UDM device.

[0067] Step 302: UDM generates first UE policy update information based on the adjustment information of the first UE policy in the 5G network and sends it to the Home Subscriber Server (HSS) so that the HSS can update and store the second UE policy corresponding to the first UE policy based on the first UE policy update information.

[0068] In one embodiment, the AMF receives adjustment information of the first UE policy in the 5G network sent by the Policy Control Function (PCF). The HSS sends the updated second UE policy to the UE when the UE switches from the 5G network or moves to the EPC network.

[0069] In one embodiment, such as Figure 4 As shown, this disclosure provides a Home Subscriber Server (HSS) 40, which includes an update information receiving module 41, a UE policy adjustment module 42, and a UE policy distribution module 43. The update information receiving module 41 receives first UE policy update information corresponding to a User Equipment (UE) sent by a Unified User Management Device (UDM); wherein, the UDM generates the first UE policy update information based on the adjustment information of the first UE policy in the 5G network.

[0070] The UE policy adjustment module 42 updates and stores the second UE policy corresponding to the first UE policy based on the first UE policy update information. The UE policy delivery module 43 delivers the updated second UE policy to the UE when the UE switches from the 5G network or moves to the EPC network.

[0071] In one embodiment, the UE policy delivery module 43 sends the updated second UE policy to the Mobility Management Entity (MME); wherein the MME sends the updated second UE policy to the UE through a base station. The update information receiving module 41 receives the UE policy update information corresponding to the UE sent by the UDM device through the SBI interface. If it is determined that the first UE policy update information contains first information in the 5G network, the UE policy adjustment module 42 converts the first information into the second information corresponding to the EPC network.

[0072] Figure 5 This is a schematic diagram of a module according to another embodiment of the HSS of this disclosure. Figure 5As shown, the HSS may include a memory 51, a processor 52, a communication interface 53, and a bus 54. The memory 51 is used to store instructions, and the processor 52 is coupled to the memory 51. The processor 52 is configured to execute the UE policy update method described above based on the instructions stored in the memory 51.

[0073] The memory 51 can be high-speed RAM, non-volatile memory, or a memory array. The memory 51 may also be divided into blocks, and these blocks can be combined into virtual volumes according to certain rules. The processor 52 can be a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the UE strategy update method of this disclosure.

[0074] In one embodiment, such as Figure 6 As shown, this disclosure provides an AMF 60, including an information sending module 61 and an information receiving module 62. The information sending module 61 sends adjustment information of a first UE policy in the 5G network to a unified user management (UDM) device; wherein, the UDM generates first UE policy update information based on the adjustment information of the first UE policy in the 5G network and sends it to the Home Subscriber Server (HSS), so that the HSS updates and stores the second UE policy corresponding to the first UE policy based on the first UE policy update information. The information receiving module 62 receives the adjustment information of the first UE policy in the 5G network sent by the policy control function (PCF).

[0075] Figure 7 This is a schematic diagram of a module according to another embodiment of the AMF of this disclosure. Figure 5 As shown, the AMF may include a memory 71, a processor 72, a communication interface 73, and a bus 74. The memory 71 is used to store instructions, and the processor 72 is coupled to the memory 71. The processor 72 is configured to execute the update method for implementing the UE strategy described above based on the instructions stored in the memory 71.

[0076] The memory 71 can be high-speed RAM, non-volatile memory, or a memory array. The memory 71 may also be divided into blocks, and these blocks can be combined into virtual volumes according to certain rules. The processor 72 can be a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the UE strategy update method of this disclosure.

[0077] In one embodiment, this disclosure provides a UE policy update system, including HSS 81 as in any of the above embodiments and AMF 83 as in any of the above embodiments; the UE policy update system may further include UDM 82 and PCF 83.

[0078] In one embodiment, this disclosure provides a computer-readable storage medium storing computer instructions that, when executed by a processor, implement the UE policy update method as described in any of the preceding embodiments.

[0079] The UE policy update method, HSS, AMF, and storage medium in the above embodiments propose a technical solution for terminals to receive dynamic UE policy updates under 4G, which can solve the problem of UE policy asynchrony in 4G and 5G networks. Without adding new interfaces, it utilizes the existing HSS-UDM interoperability architecture, requiring minimal equipment modification and is easy to implement. It enables UEs to obtain UE policies that are flexibly adjusted by the PCF in 4G networks, maintaining policy consistency under the interoperability architecture. It has wide applicability and is suitable for both interoperability architectures with and without N26 interfaces. It can provide users with flexible policy scheduling, fully utilize network resources to provide a better service experience, and reduce network maintenance costs and risks.

[0080] The methods and systems of this disclosure may be implemented in many ways. For example, they may be implemented by software, hardware, firmware, or any combination of software, hardware, and firmware. The above-described order of steps for the methods is for illustrative purposes only, and the steps of the methods of this disclosure are not limited to the order specifically described above unless otherwise specifically stated. Furthermore, in some embodiments, this disclosure may also be implemented as a program recorded on a recording medium, the program including machine-readable instructions for implementing the methods according to this disclosure. Thus, this disclosure also covers recording media storing programs for performing the methods according to this disclosure.

[0081] The description in this disclosure is provided for illustrative and descriptive purposes only and is not intended to be exhaustive or to limit the disclosure to its forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of this disclosure and to enable those skilled in the art to understand this disclosure and to design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A method for updating a UE policy, comprising: The Home Subscriber Server (HSS) receives the first UE policy update information corresponding to the User Equipment (UE) sent by the Unified User Management Device (UDM). The UDM generates the first UE policy update information based on the adjustment information of the first UE policy in the 5G network. The HSS updates and stores the second UE policy corresponding to the first UE policy based on the first UE policy update information. When the UE switches from the 5G network or moves to the EPC network, the HSS will send the updated second UE policy to the UE.

2. The method as described in claim 1, wherein sending the updated second UE policy to the UE comprises: The HSS sends the updated second UE policy to the Mobility Management Entity (MME); The MME sends the updated second UE policy to the UE via the base station.

3. The method as described in claim 1, wherein the HSS receiving the UE policy update information corresponding to the UE sent by the UDM device includes: The HSS receives the first UE policy update information corresponding to the UE sent by the UDM device through the SBI interface.

4. The method of claim 1, further comprising: The Access and Mobility Management Function (AMF) receives adjustment information of the first UE policy in the 5G network from the Policy Control Function (PCF). The AMF sends the adjustment information of the first UE policy in the 5G network to the UDM.

5. The method of claim 1, further comprising: If the HSS determines that the first UE policy update information contains first information in the 5G network, then it converts the first information into the corresponding second information in the EPC network; or, If the UDM device determines that the adjustment information of the first UE policy in the 5G network contains the first information, then it converts the first information into the second information. or, If the UE determines that the updated second UE policy contains first information, then the first information is converted into the second information.

6. A method for updating a UE policy, comprising: The Access and Mobility Management (AMF) function sends information on the adjustment of the first UE policy in the 5G network to the Unified User Management (UDM) device. The UDM generates first UE policy update information based on the adjustment information of the first UE policy in the 5G network and sends it to the Home Subscriber Server (HSS), so that the HSS updates and stores the second UE policy corresponding to the first UE policy based on the first UE policy update information.

7. The method of claim 6, comprising: The AMF receives the adjustment information of the first UE policy in the 5G network sent by the policy control function PCF.

8. The method of claim 6, further comprising: When the UE switches from the 5G network or moves to the EPC network, the HSS will send the updated second UE policy to the UE.

9. The method of claim 8, wherein sending the updated second UE policy to the UE comprises: The HSS sends the updated second UE policy to the Mobility Management Entity (MME); The MME sends the updated second UE policy to the UE via the base station.

10. The method of claim 6, further comprising: The HSS receives the first UE policy update information corresponding to the UE sent by the UDM device through the SBI interface.

11. A Home Subscriber Server (HSS), comprising: The update information receiving module is used to receive first UE policy update information corresponding to the user equipment (UE) sent by the unified user management (UDM) device; wherein, the UDM generates the first UE policy update information according to the adjustment information of the first UE policy in the 5G network. The UE policy adjustment module is used to update and store the second UE policy corresponding to the first UE policy based on the first UE policy update information. The UE policy delivery module is used to deliver the updated second UE policy to the UE when the UE switches from the 5G network or moves to the EPC network.

12. The HSS as claimed in claim 11, wherein, The UE policy delivery module is used to send the updated second UE policy to the Mobility Management Entity (MME); wherein the MME sends the updated second UE policy to the UE through a base station.

13. The HSS as claimed in claim 11, wherein, The update information receiving module is used to receive the first UE policy update information corresponding to the UE sent by the UDM device through the SBI interface.

14. The HSS as claimed in claim 11, wherein, The UE policy adjustment module is used to convert the first information into the corresponding second information in the EPC network if it is determined that the first UE policy update information contains first information in the 5G network.

15. An HSS comprising: Memory; And a processor coupled to the memory, the processor being configured to perform the method as described in any one of claims 1 to 5 based on instructions stored in the memory.

16. An Access and Mobility Management Function (AMF), comprising: The information sending module is used to send the adjustment information of the first UE policy in the 5G network to the unified user management UDM device; The UDM generates first UE policy update information based on the adjustment information of the first UE policy in the 5G network and sends it to the Home Subscriber Server (HSS), so that the HSS updates and stores the second UE policy corresponding to the first UE policy based on the first UE policy update information.

17. The AMF as claimed in claim 16, comprising: The information receiving module is used to receive the adjustment information of the first UE policy in the 5G network sent by the policy control function PCF.

18. An AMF comprising: Memory; and a processor coupled to the memory, the processor being configured to perform the method as described in any one of claims 6 to 10 based on instructions stored in the memory.

19. A UE policy update system, comprising: The HSS as described in any one of claims 11 to 15, and the AMF as described in any one of claims 16 to 18.

20. A computer-readable storage medium storing computer instructions that are executed by a processor according to any one of claims 1 to 10.

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