QoS negotiation method and system of satellite 5G network

Abstract

The invention discloses a QoS negotiation method and system for a satellite 5G network, and the method comprises the steps: when a satellite private network user is attached to the satellite 5G network, after authentication is completed in a private network core network and QoS is obtained, calibration is additionally carried out again on an ePCF of an operator, the ePCF can carry out the statistics of the QoS condition of the private network user and the online condition of the private network user of each QoS level under the private network, and the QoS of the private network user is obtained. And returning the QoS strategy to the private network core network according to the private network QoS strategy provided by the local configuration or the satellite operation support system, thereby controlling the QoS of the private network user under the condition that the private network user information is not acquired. Through the method, the private network core network does not need to report the user information to the operator, the operator can still control the QoS of the private network user, and meanwhile the number of the users with the high QoS level can be limited.

Description

Technical Field

[0001] The present invention relates to the field of satellite communication technology, and in particular to a QoS negotiation method and system for a satellite 5G network. Background Art

[0002] 3GPP (3rd Generation Partnership Project) designed a satellite 5G network in the NTN (NonTerrestrial Network) non-terrestrial network, connecting the 5G core network and satellite base stations to implement the satellite 5G network solution. This solution supports satellite terminal users to access the ground 5G core network through satellite base stations for data service communications.

[0003] In addition to ordinary users, various government and enterprise users have also put forward demands for satellite 5G networks, hoping to establish satellite 5G private networks to meet their dedicated needs for satellite communications. These satellite 5G private networks are established by satellite 5G network operators for private network users. Independent 5G core networks are established to achieve satellite 5G private network communications through shared satellite base stations. With this satellite 5G private network solution, in order to protect their own rights and interests and control over the network, such as controlling the QoS (Quality of Service) of private network users to ensure the healthy use of satellite network resources, satellite 5G network operators will require the satellite 5G private network core network to be connected to the operator's own core network, and synchronize private network user information such as SUPI and MDN to the operator's core network UDM. For satellite private network users, due to concerns about the exposure of user information, they often refuse to provide user information to operators, resulting in conflicts between the two parties.

[0004] Therefore, the prior art still needs to be improved and developed. Summary of the invention

[0005] The main purpose of the present invention is to provide a QoS negotiation method and system for a satellite 5G network, aiming to solve the problem in the prior art that satellite private network users often refuse to provide user information to operators due to concerns about the exposure of user information, thereby causing conflicts between the two parties.

[0006] To achieve the above object, the present invention provides a QoS negotiation method for a satellite 5G network, and the QoS negotiation method for a satellite 5G network comprises the following steps:

[0007] The satellite private network user terminal initiates a registration request to the satellite access network, and the satellite access network selects the private network AMF according to its own configuration and the registration request;

[0008] The private network AMF forwards the message to the private network UDM for processing and obtains the processing result;

[0009] The private network UDM returns the processing result to the private network AMF, and the returned processing result carries the contracted RFSPIndex of the private network user and the TAI of the private network user;

[0010] The private network AMF initiates an access and mobility authorization request to the ePCF of the satellite 5G public network core network, carrying the contracted RFSPIndex of the private network user and the TAI of the private network user;

[0011] The ePCF queries the private network QoS usage table stored locally. If the QoS level applied by the user has a margin, the RFSPIndex is not modified, and the QoS policy is issued according to the applied QoS level. If the QoS level has no margin, the operation support system is queried for the private network QoS policy;

[0012] The operation support system replies to the ePCF with the private network QoS policy response, including the latest capacity of each QoS level of the private network;

[0013] The ePCF makes a judgment based on the capacity of each QoS level of the latest private network. If the capacity is sufficient, the RFSPIndex is not modified, and the QoS policy is issued according to the applied QoS level. If the capacity is insufficient, the QoS level is reduced according to the configuration policy, and the RFSPIndex is returned to the private network AMF;

[0014] The private network AMF returns the registration response carrying the RFSPIndex returned by the ePCF to the satellite access network, and the QoS negotiation is completed.

[0015] Optionally, the QoS negotiation method of the satellite 5G network, wherein the satellite private network user terminal initiates a registration request to the satellite access network, and the satellite access network selects a private network AMF according to its own configuration and the registration request, specifically includes:

[0016] The satellite private network user terminal initiates a registration request to the satellite access network;

[0017] The satellite access network determines the core network to which the satellite private network user terminal belongs based on the PLMN ID carried by the satellite private network user terminal in the registration request, and selects the designated private network AMF, or the satellite access network sends the registration request to the designated source AMF and then selects the private network AMF based on the slice ID.

[0018] Optionally, in the QoS negotiation method of the satellite 5G network, the signed RFSPIndex includes private network user QoS information.

[0019] Optionally, in the QoS negotiation method of the satellite 5G network, the private network QoS policy indicates that when the capacity usage limit is reached, the QoS level of newly applied users will be downgraded, access will be prohibited, or the QoS level will be temporarily increased.

[0020] Optionally, in the QoS negotiation method of the satellite 5G network, the contracted RFSPIndex of the private network user is used to confirm the QoS level; the SUPI of the private network user is used to confirm the user identity; and the TAI of the private network user is used to confirm the user's regional location.

[0021] Optionally, the QoS negotiation method of the satellite 5G network, wherein the satellite private network user terminal is connected to the satellite access network of the ground gateway through the satellite base station of the satellite operator, and directly accesses the satellite private network 5G core network from the ground gateway.

[0022] Optionally, the QoS negotiation method of the satellite 5G network, wherein the satellite private network 5G core network is connected to the ePCF of the satellite public network 5G core network via a dedicated line.

[0023] Optionally, the QoS negotiation method for the satellite 5G network, wherein the ePCF synchronizes the private network QoS policy with the operation support system.

[0024] Optionally, the QoS negotiation method for the satellite 5G network, wherein the private network QoS policy is a set of rules used to manage and ensure the quality of network data transmission.

[0025] In addition, to achieve the above-mentioned purpose, the present invention also provides a QoS negotiation system for a satellite 5G network, wherein the QoS negotiation system for a satellite 5G network includes:

[0026] Satellite private network user terminals, satellite access network, private network AMF, private network UDM, ePCF and operation support system of satellite 5G public network core network;

[0027] The satellite private network user terminal initiates a registration request to the satellite access network, and the satellite access network selects a private network AMF according to its own configuration and the registration request;

[0028] The private network AMF forwards the message to the private network UDM for processing and obtains the processing result;

[0029] The private network UDM returns the processing result to the private network AMF, and the returned processing result carries the contracted RFSPIndex of the private network user and the TAI of the private network user;

[0030] The private network AMF initiates an access and mobility authorization request to the ePCF of the satellite 5G public network core network, carrying the contracted RFSPIndex of the private network user and the TAI of the private network user;

[0031] The ePCF queries the private network QoS usage table stored locally. If the QoS level applied by the user has a margin, the RFSPIndex is not modified, and the QoS policy is issued according to the applied QoS level. If the QoS level has no margin, the operation support system is queried for the private network QoS policy;

[0032] The operation support system replies to the ePCF with the private network QoS policy response, including the latest capacity of each QoS level of the private network;

[0033] The ePCF makes a judgment based on the capacity of each QoS level of the latest private network. If the capacity is sufficient, the RFSPIndex is not modified, and the QoS policy is issued according to the applied QoS level. If the capacity is insufficient, the QoS level is reduced according to the configuration policy, and the RFSPIndex is returned to the private network AMF;

[0034] The private network AMF returns the registration response carrying the RFSPIndex returned by the ePCF to the satellite access network, and the QoS negotiation is completed.

[0035] In the present invention, the satellite private network user terminal initiates a registration request to the satellite access network, and the satellite access network selects the private network AMF according to its own configuration and the registration request; the private network AMF forwards the message to the private network UDM for processing to obtain a processing result; the private network UDM returns the processing result to the private network AMF, and the returned processing result carries the contracted RFSPIndex of the private network user and the TAI of the private network user; the private network AMF initiates an access and mobility authorization request to the ePCF of the satellite 5G public network core network, carrying the contracted RFSPIndex of the private network user and the TAI of the private network user; the ePCF queries the private network QoS usage table stored locally, and if the QoS level applied by the user has a surplus, the RF SPIndex, issue QoS policy according to the applied QoS level, if there is no margin for the QoS level, query the private network QoS policy from the operation support system; the operation support system replies to the private network QoS policy response of ePCF, including the latest capacity of each QoS level of the private network; the ePCF makes a judgment based on the latest capacity of each QoS level of the private network, if the capacity is sufficient, the RFSPIndex is not modified, and the QoS policy is issued according to the applied QoS level, if the capacity is insufficient, the QoS level is reduced according to the configuration strategy, and the RFSPIndex is returned to the private network AMF; the private network AMF returns the registration response carrying the RFSPIndex returned by ePCF to the satellite access network, and the QoS negotiation is completed. The present invention ensures that the private network user information is not exposed, while ensuring that the satellite 5G network operator performs unified QoS control on public network and private network users. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a satellite 5G private network architecture diagram of the present invention;

[0037] Figure 2 It is a flow chart of a preferred embodiment of the QoS negotiation method of the satellite 5G network of the present invention;

[0038] Figure 3 It is a structural diagram of a preferred embodiment of the QoS negotiation system of the satellite 5G network of the present invention. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the present invention clearer and more specific, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0040] like Figure 1As shown in the figure, it represents the networking architecture diagram of satellite 5G private network. The satellite private network user terminal is connected to the satellite access network of the ground gateway through the satellite operator's satellite base station, and then directly accesses the satellite private network 5G core network from the ground gateway. The satellite private network 5G core network is connected to the ePCF of the satellite public network 5G core network through a dedicated line. The operator's ePCF synchronizes the private network QoS strategy with the satellite operation support system.

[0041] QoS (Quality of Service) strategy is a set of rules for managing and ensuring the quality of network data transmission in 5G networks. Its purpose is to meet the different requirements of network performance for different types of services (such as high-definition video, online games, data transmission of IoT devices, etc.). Private network QoS strategy is the QoS strategy used in private networks. It stipulates the rules for QoS use in private networks, such as the priority of different levels of QoS, the bandwidth limit, the preemption capability, etc.; as well as QoS usage strategies, such as QoS usage strategies within private networks. When there are too many users with high QoS levels in the private network and the network usage limit is exceeded, new high-level QoS applications will be downgraded, access restricted, or access allowed.

[0042] The present invention proposes a method that does not expose private network user information while ensuring that satellite 5G network operators perform unified QoS control on public network and private network users. In the satellite 5G core network of the satellite 5G network operator, the PCF network element is enhanced, called ePCF. When the satellite private network user attaches to the satellite 5G network, after the private network core network completes authentication and obtains QoS, it will also go to the operator's ePCF for another calibration. The ePCF will count the QoS of the private network users and the online status of the private network users of each QoS level under the private network. According to the local configuration or the private network QoS policy provided by the satellite operation support system, the QoS policy is returned to the private network core network, thereby controlling the QoS of the private network users without obtaining the private network user information. Through this method, the private network core network does not need to report user information to the operator, and the operator can still control the QoS of the private network users, and the number of users with high QoS levels can also be limited.

[0043] The QoS negotiation method of the satellite 5G network described in the preferred embodiment of the present invention is as follows: Figure 2 and Figure 3 As shown, the QoS negotiation method of the satellite 5G network includes the following steps:

[0044] Step S10: The satellite private network user terminal initiates a registration request to the satellite access network, and the satellite access network selects the private network AMF according to its own configuration and the registration request.

[0045] Specifically, the satellite private network user terminal initiates a registration request to the satellite access network (satellite 5G network); the satellite access network determines the core network to which the satellite private network user terminal belongs according to the PLMN ID carried by the satellite private network user terminal in the registration request, and selects the designated private network AMF (Access and Mobility Management Function), or the satellite access network sends the registration request to the designated source AMF and then selects the private network AMF according to the slice ID.

[0046] Among them, PLMN ID is the network ID of the operator. Except for some special users, private network services generally use the same PLMN ID. The satellite access network determines the core network to which it belongs based on the slice ID of the terminal. If the terminal does not carry the slice ID, or the slice ID carried is incorrect, it will go to the source AMF and then select the private network AMF according to the slice ID signed by the user.

[0047] Step S20: The private network AMF forwards the message to the private network UDM for processing to obtain a processing result.

[0048] Specifically, after receiving the registration request message sent by the satellite terminal, AMF will select the AUSF (Authentication Server Function) of this core network to request authentication. After receiving the authentication request, AUSF will request the user's authentication data from UDM (Unified Data Management). UDM will send the authentication data to AUSF. AUSF is responsible for authentication and key negotiation, and will feedback the authentication result to AMF. In addition to the authentication data, it will also obtain the contract data, such as which services have been contracted and the QoS policy signed in this UDM.

[0049] Step S30, the private network UDM returns the processing result to the private network AMF, and the returned processing result carries the private network user's contracted RFSPIndex (Routing and Forwarding Control for User Plane Index, user plane routing and forwarding control index, RFSPIndex is a type of user-contracted data, which contains the user's QoS information) and the private network user's TAI (Tracking Area Identity).

[0050] The contracted RFSPIndex contains the QoS information of the private network user; the contracted RFSPIndex of the private network user is used to confirm the QoS level; the SUPI of the private network user is used to confirm the user identity; the TAI of the private network user is used to confirm the regional location of the user.

[0051] Step S40, the private network AMF initiates an access and mobility authorization request (i.e., a request message sent by AMF to ePCF) to the ePCF (Enhanced Policy Control Function) of the satellite 5G public network core network, carrying the contracted RFSPIndex of the private network user and the TAI of the private network user.

[0052] Step S50, the ePCF queries the private network QoS usage table stored locally. If the QoS level applied for by the user has a margin, the RFSPIndex is not modified, and the QoS policy is issued according to the applied QoS level. If the QoS level has no margin, the private network QoS policy is queried from the operation support system.

[0053] For a private network, the operator can allocate different levels of QoS to users based on the contract with the users, for example, 100 users for the highest QoS, 1,000 users for the second highest QoS, and 10,000 users for ordinary QoS. When users register, ePCF will count the number of users of each QoS level in the current private network. When a new user registers, if he applies for a high level of QoS, ePCF will check how much of the current high level QoS has been used and how much is left.

[0054] Step S60: The operation support system replies to the ePCF with a private network QoS policy response, including the latest capacity of each QoS level of the private network.

[0055] If the number of high-level QoS users has reached the limit saved in ePCF, the operation support system will be queried. The private network QoS policy here refers to the QoS capacity policy, that is, when the capacity usage limit is reached, whether to downgrade the newly applied users, prohibit access, or temporarily increase the QoS level.

[0056] QoS level is the level given to a user or a service session of the user, indicating the priority and bandwidth guarantee of the user or a service of the user in the network. Private network QoS policy is the specification of QoS usage in the private network, that is, it stipulates how much network resources each level of QoS can enjoy, how many high-level QoS users are allowed in the network, and when network resources are limited, give priority to high-level QoS users, kick off the line or do not allocate network resources to low-level users.

[0057] Step S70, the ePCF makes a judgment based on the capacity of each QoS level of the latest private network. If the capacity is sufficient, the RFSPIndex will not be modified, and the QoS policy will be issued according to the applied QoS level. If the capacity is insufficient, the QoS level will be lowered according to the configuration policy, and the RFSPIndex will be returned to the private network AMF.

[0058] Step S80: The private network AMF returns the registration response carrying the RFSPIndex returned by the ePCF to the satellite access network, and the QoS negotiation is completed.

[0059] Furthermore, if Figure 3 As shown, based on the above-mentioned QoS negotiation method of the satellite 5G network, the present invention also provides a QoS negotiation system of the satellite 5G network, wherein the QoS negotiation system of the satellite 5G network includes: a satellite private network user terminal, a satellite access network, a private network AMF, a private network UDM, an ePCF of a satellite 5G public network core network, and an operation support system;

[0060] The satellite private network user terminal initiates a registration request to the satellite access network, and the satellite access network selects a private network AMF according to its own configuration and the registration request;

[0061] The private network AMF forwards the message to the private network UDM for processing and obtains the processing result;

[0062] The private network UDM returns the processing result to the private network AMF, and the returned processing result carries the contracted RFSPIndex of the private network user and the TAI of the private network user;

[0063] The private network AMF initiates an access and mobility authorization request to the ePCF of the satellite 5G public network core network, carrying the contracted RFSPIndex of the private network user and the TAI of the private network user;

[0064] The ePCF queries the private network QoS usage table stored locally. If the QoS level applied by the user has a margin, the RFSPIndex is not modified, and the QoS policy is issued according to the applied QoS level. If the QoS level has no margin, the operation support system is queried for the private network QoS policy;

[0065] The operation support system replies to the ePCF with the private network QoS policy response, including the latest capacity of each QoS level of the private network;

[0066] The ePCF makes a judgment based on the capacity of each QoS level of the latest private network. If the capacity is sufficient, the RFSPIndex is not modified, and the QoS policy is issued according to the applied QoS level. If the capacity is insufficient, the QoS level is reduced according to the configuration policy, and the RFSPIndex is returned to the private network AMF;

[0067] The private network AMF returns the registration response carrying the RFSPIndex returned by the ePCF to the satellite access network, and the QoS negotiation is completed.

[0068] The improvements and technical effects of the present invention are as follows:

[0069] (1) The PCF of the satellite 5G core network has been enhanced so that it can independently save a private network QoS usage table, which counts the number of real-time online users of each level of the private network QoS.

[0070] (2) The QoS negotiation process has been modified. When negotiating QoS, private network users are required to carry user QoS information and TAIS to the ePCF for a secondary review.

[0071] (3) ePCF can determine whether the QoS level margin applied for by the private network user is sufficient based on the private network QoS usage table, and modify RFSPIndex to modify the QoS of the private network user.

[0072] (4) ePCF can apply to the operation support system to query the QoS policy of the private network to update the local private network QoS usage table.

[0073] In summary, the present invention provides a QoS negotiation method and system for a satellite 5G network, the method comprising: a satellite private network user terminal initiates a registration request to a satellite access network, the satellite access network selects a private network AMF according to its own configuration and the registration request; the private network AMF forwards the message to the private network UDM for processing to obtain a processing result; the private network UDM returns the processing result to the private network AMF, and the returned processing result carries the contracted RFSPIndex of the private network user and the TAI of the private network user; the private network AMF initiates an access and mobility authorization request to the ePCF of the satellite 5G public network core network, carrying the contracted RFSPIndex of the private network user and the TAI of the private network user; the ePCF queries the locally stored private network QoS usage table, and if the user applies for If there is a margin for the QoS level, RFSPIndex will not be modified, and the QoS policy will be issued according to the applied QoS level. If there is no margin for the QoS level, the private network QoS policy will be queried from the operation support system; the operation support system replies to the private network QoS policy response of ePCF, including the latest capacity of each QoS level of the private network; the ePCF makes a judgment based on the latest capacity of each QoS level of the private network. If the capacity is sufficient, RFSPIndex will not be modified, and the QoS policy will be issued according to the applied QoS level. If the capacity is insufficient, the QoS level will be lowered according to the configuration strategy, and RFSPIndex will be returned to the private network AMF; the private network AMF will return the registration response carrying the RFSPIndex returned by ePCF to the satellite access network, and the QoS negotiation is completed. The present invention ensures that the private network user information is not exposed, while ensuring that the satellite 5G network operator performs unified QoS control on public network and private network users.

[0074] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal. In the absence of further restrictions, an element defined by the sentence "includes a ..." does not exclude the existence of other identical elements in the process, method, article or terminal including the element.

[0075] Of course, those skilled in the art can understand that all or part of the processes in the above-mentioned embodiments can be implemented by instructing related hardware (such as a processor, a controller, etc.) through a computer program, and the program can be stored in a computer-readable storage medium that can be read by a computer, and the program can include the processes of the above-mentioned method embodiments when executed. The computer-readable storage medium can be a memory, a disk, an optical disk, etc.

[0076] It should be understood that the application of the present invention is not limited to the above examples. For ordinary technicians in this field, improvements or changes can be made based on the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A QoS negotiation method for a satellite 5G network, characterized in that: The QoS negotiation method of the satellite 5G network includes: The satellite private network user terminal initiates a registration request to the satellite access network, and the satellite access network selects the private network AMF according to its own configuration and the registration request; The private network AMF forwards the message to the private network UDM for processing and obtains the processing result; The private network UDM returns the processing result to the private network AMF, and the returned processing result carries the contracted RFSPIndex of the private network user and the TAI of the private network user; The private network AMF initiates an access and mobility authorization request to the ePCF of the satellite 5G public network core network, carrying the contracted RFSPIndex of the private network user and the TAI of the private network user; The ePCF queries the private network QoS usage table stored locally. If the QoS level applied by the user has a margin, the RFSPIndex is not modified, and the QoS policy is issued according to the applied QoS level. If the QoS level has no margin, the operation support system is queried for the private network QoS policy; The operation support system replies to the ePCF with the private network QoS policy response, including the latest capacity of each QoS level of the private network; The ePCF makes a judgment based on the capacity of each QoS level of the latest private network. If the capacity is sufficient, the RFSPIndex is not modified, and the QoS policy is issued according to the applied QoS level. If the capacity is insufficient, the QoS level is reduced according to the configuration policy, and the RFSPIndex is returned to the private network AMF; The private network AMF returns the registration response carrying the RFSPIndex returned by the ePCF to the satellite access network, and the QoS negotiation is completed.

2. The QoS negotiation method for satellite 5G network according to claim 1, characterized in that: The satellite private network user terminal initiates a registration request to the satellite access network, and the satellite access network selects a private network AMF according to its own configuration and the registration request, specifically including: The satellite private network user terminal initiates a registration request to the satellite access network; The satellite access network determines the core network to which the satellite private network user terminal belongs based on the PLMN ID carried by the satellite private network user terminal in the registration request, and selects the designated private network AMF, or the satellite access network sends the registration request to the designated source AMF and then selects the private network AMF based on the slice ID.

3. The QoS negotiation method for satellite 5G network according to claim 1, characterized in that: The signed RFSPIndex includes private network user QoS information.

4. The QoS negotiation method for satellite 5G network according to claim 1, characterized in that: The private network QoS policy indicates that when the capacity usage limit is reached, the QoS level of newly applied users will be downgraded, access will be prohibited, or the QoS level will be temporarily increased.

5. The QoS negotiation method for satellite 5G network according to claim 1, characterized in that: The contracted RFSPIndex of the private network user is used to confirm the QoS level; the SUPI of the private network user is used to confirm the user identity; and the TAI of the private network user is used to confirm the regional location of the user.

6. The QoS negotiation method for satellite 5G network according to claim 1, characterized in that: The satellite private network user terminal is connected to the satellite access network of the ground gateway through the satellite base station of the satellite operator, and directly accesses the satellite private network 5G core network from the ground gateway.

7. The QoS negotiation method for satellite 5G network according to claim 6, characterized in that: The satellite private network 5G core network is connected to the ePCF of the satellite public network 5G core network through a dedicated line.

8. The QoS negotiation method for satellite 5G network according to claim 1, characterized in that: The ePCF synchronizes the private network QoS policy with the operation support system.

9. The QoS negotiation method for a satellite 5G network according to claim 1 or 8, characterized in that: The private network QoS policy is a set of rules used to manage and ensure the quality of network data transmission.

10. A QoS negotiation system for a satellite 5G network, characterized in that: The QoS negotiation system of the satellite 5G network includes: satellite private network user terminal, satellite access network, private network AMF, private network UDM, ePCF of the satellite 5G public network core network and operation support system; The satellite private network user terminal initiates a registration request to the satellite access network, and the satellite access network selects a private network AMF according to its own configuration and the registration request; The private network AMF forwards the message to the private network UDM for processing and obtains the processing result; The private network UDM returns the processing result to the private network AMF, and the returned processing result carries the contracted RFSPIndex of the private network user and the TAI of the private network user; The private network AMF initiates an access and mobility authorization request to the ePCF of the satellite 5G public network core network, carrying the contracted RFSPIndex of the private network user and the TAI of the private network user; The ePCF queries the private network QoS usage table stored locally. If the QoS level applied by the user has a margin, the RFSPIndex is not modified, and the QoS policy is issued according to the applied QoS level. If the QoS level has no margin, the operation support system is queried for the private network QoS policy; The operation support system replies to the ePCF with the private network QoS policy response, including the latest capacity of each QoS level of the private network; The ePCF makes a judgment based on the capacity of each QoS level of the latest private network. If the capacity is sufficient, the RFSPIndex is not modified, and the QoS policy is issued according to the applied QoS level. If the capacity is insufficient, the QoS level is reduced according to the configuration policy, and the RFSPIndex is returned to the private network AMF; The private network AMF returns the registration response carrying the RFSPIndex returned by the ePCF to the satellite access network, and the QoS negotiation is completed.

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