Communication method, device and system, network equipment and storage medium

Abstract

The present disclosure relates to a communication method, apparatus and system, network equipment and storage medium, the method comprising: in response to the triggering of a policy decision, a first control plane network element executes a SM policy association modification process initiated by itself to notify a second control plane network element of the policy modification; if the data rate of S-NSSAI reaches a threshold, the first control plane network element reduces Session-AMBR and uses the actually used data rate as an input to the policy decision of the first control plane network element. The present disclosure can more reasonably dynamically allocate the transmission rate of a network slice.

Description

Technical Field

[0001] The present disclosure relates to a communication method, apparatus and system, network equipment and storage medium. Background Art

[0002] Network slices can provide complete network functions, such as radio access network functions, core network functions, and IP Multimedia Subsystem (IMS) functions. A network can support one or more network slices. Network slices can provide different committed services and are dedicated to users. Slices with the same service or slice but different slice identifiers may have different single network slice selection assistance information (S-NSSAI, Single Network Slice Selection Assistance Information).

[0003] Multiple network slices deployed by an operator may provide exactly the same functionality but for different groups of UEs because they provide different committed services and / or are dedicated to customers. In this case, such network slices may have different S-NSSAIs for the same slice or different slice distinguishers for the same service type.

[0004] The selection of a set of network slice instances for the UE is typically triggered by the first contacted Access and Mobility Management Function (AMF) during the registration process through interaction with the Network Slice Selection Function (NSSF), and may result in a change of AMF. Per PLMN, a PDU Session belongs to one and only one specific network slice instance. Although different network slice instances may have PDU Sessions for a specific slice using the same DNN, different network slice instances do not share PDU Sessions. During the handover process, the source AMF selects the target AMF by interacting with the Network Registration Function (NRF, NF Repository Function).

[0005] A Generic Network Slice Template (NEST) is applied to a network slice even if it is supported by multiple network slice instances. A Generic Network Slice Template (GST) defines the properties supported by a network slice. For example, the maximum downlink throughput defines the maximum data rate supported by a network slice in the downlink, while the maximum uplink throughput defines the maximum data rate supported by a network slice in the uplink. These parameters can be used for different network slice contracts to provide quality levels, such as gold, silver, and bronze users with different maximum throughput values ​​for guaranteed bit rate (GBR) and non-GBR services.

[0006] The Public Land Mobile Network (PLMN) can support slice data rate limits through configuration. However, the 5G network needs to dynamically adjust the slice uplink and downlink UL and DL bandwidth (aggregate traffic) to adapt to network control requirements. For example, when this data rate limit is reached, the fairness between UE data rates in the PLMN is triggered. In this regard, the key issue is how to adjust the data rate limit of each UE applicable to GBR and non-GBR traffic, and how to adjust the total number of UEs running in the slice. In other words, how to achieve dynamic adjustment to meet the data rate limits of network slice UL and DL is a key requirement and issue for the network slicing function of the 5G system. Summary of the invention

[0007] In view of this, embodiments of the present disclosure provide a communication method, apparatus and system, network equipment and storage medium.

[0008] According to a first aspect of the present disclosure, there is provided a communication method, comprising:

[0009] In response to the triggering of the policy decision, the first control plane network element executes the SM policy association modification process initiated by itself to notify the second control plane network element of the policy modification;

[0010] If the data rate of the slice reaches the threshold, the first control plane network element uses the actually used data rate as input for policy decision-making to reduce the session aggregation maximum bit rate Session-AMBR.

[0011] In some embodiments, the method further comprises:

[0012] The first control plane network element uses the ratio of the actually used data rate to the accumulated data rate and the service data flow SDF maximum bit rate MBR as an input for the policy decision of the first control plane network element.

[0013] In some embodiments, the method further comprises:

[0014] The first control plane network element uses the user category as an input to a policy decision of the first control plane network element.

[0015] In some embodiments, the method further comprises:

[0016] The first control plane network element uses the application-based preference as an input to a policy decision of the first control plane network element.

[0017] In some embodiments, the method further comprises:

[0018] The first control plane network element uses the user category and the application-based preference as inputs to a policy decision of the first control plane network element.

[0019] In some embodiments, the first control plane network element reduces the Session-AMBR, including:

[0020] The first control plane network element sends a first indication message to the second control plane network element, where the first indication message is used to indicate a modification of an SM policy association for reducing a Session-AMBR.

[0021] In some embodiments, the first indication message includes at least one of the following information: an S-NSSAI identifier and an authorized Session-AMBR.

[0022] In some embodiments, the method further comprises:

[0023] The first control plane network element uses the analysis information provided by the network data analysis function NWDAF network element as input for policy decision of the first control plane network element.

[0024] According to a second aspect of the present disclosure, a communication method is provided, the method comprising:

[0025] In response to the triggering of the policy decision, the first control plane network element executes the SM policy association modification process initiated by itself to notify the second control plane network element of the policy modification;

[0026] If the data rate of the S-NSSAI reaches a threshold, the first control plane network element updates the policy and charging control PCC rule and uses the actually used data rate as an input for the policy decision of the first control plane network element.

[0027] In some embodiments, the method further comprises:

[0028] The first control plane network element uses the ratio of the actual used data rate of the slice to the accumulated data rate (GBR data flow) and the maximum bit rate MBR (Non-GBR data flow) of the service data flow SDF as input for the policy decision of the first control plane network element.

[0029] In some embodiments, the method further comprises:

[0030] The first control plane network element uses the user category as an input to a policy decision of the first control plane network element.

[0031] In some embodiments, the method further comprises:

[0032] The first control plane network element uses the application-based preference as an input to a policy decision of the first control plane network element.

[0033] In some embodiments, the method further comprises:

[0034] The first control plane network element uses the user category and the application-based preference as inputs to a policy decision of the first control plane network element.

[0035] In some embodiments, notifying the second control plane network element of the policy modification includes:

[0036] The first control plane network element sends a first indication message to the second control plane network element, where the first indication message is used to indicate reducing the MBR of the relevant QoS flow.

[0037] In some embodiments, the first indication message includes at least one of the following information: an S-NSSAI identifier, an MBR corresponding to the SDF, and a guaranteed bit rate GBR.

[0038] In some embodiments, the method further comprises:

[0039] The first control plane network element uses the analysis information provided by the NWDAF network element as input for policy decision of the first control plane network element.

[0040] According to a third aspect of the present disclosure, a communication method is provided, the method comprising:

[0041] The second control plane network element receives a first indication message from the first control plane network element indicating that the data rate of the S-NSSAI reaches a threshold;

[0042] In response to the first indication message, the Session-AMBR is changed.

[0043] In some embodiments, the first indication message includes at least one of the following information: an S-NSSAI identifier and an authorized Session-AMBR.

[0044] In some embodiments, the method further comprises:

[0045] The second control plane network element initiates a packet data unit PDU session modification process to change the Session-AMBR.

[0046] According to a fourth aspect of the present disclosure, a communication method is provided, the method comprising:

[0047] The second control plane network element receives a first indication message from the first control plane network element indicating that the data rate of the S-NSSAI reaches a threshold;

[0048] In response to the first indication message, the corresponding MBR and GBR of the SDF are changed.

[0049] In some embodiments, the first indication message includes at least one of the following information: S-NSSAI identifier, SDF corresponding MBR and GBR.

[0050] In some embodiments, the method further comprises:

[0051] The second control plane network element executes the authorized QoS of the service data flow according to the PCC rule.

[0052] According to a fifth aspect of the present disclosure, a communication method is provided, the method comprising:

[0053] In response to the triggering of the policy decision, the first control plane network element executes the access and mobility AM policy association modification process initiated by itself to notify the third control plane network element of the policy modification;

[0054] If the data rate of S-NSSAI reaches the threshold, the first control plane network element reduces the user slice aggregation maximum bit rate UE-Slice-AMBR and uses the actually used data rate as input for the policy decision of the first control plane network element.

[0055] In some embodiments, the method further comprises:

[0056] The first control plane network element uses the ratio of the actually used data rate to the accumulated data rate and the MBR of the SDF as an input for a policy decision of the first control plane network element.

[0057] In some embodiments, the method further comprises:

[0058] The first control plane network element uses the user category as an input to a policy decision of the first control plane network element.

[0059] In some embodiments, the method further comprises:

[0060] The first control plane network element uses the application-based preference as an input to a policy decision of the first control plane network element.

[0061] In some embodiments, the method further comprises:

[0062] The first control plane network element uses the user category and the application-based preference as inputs to a policy decision of the first control plane network element.

[0063] In some embodiments, the first control plane network element reduces the UE-Slice-AMBR, including:

[0064] The first control plane network element sends a second indication message to the third control plane network element, where the second indication message is used to indicate an AM policy association modification for reducing UE-Slice-AMBR.

[0065] In some embodiments, the second indication message includes at least one of the following information: S-NSSAI identifier, authorized UE-Slice-AMBR.

[0066] In some embodiments, the method further comprises:

[0067] The first control plane network element uses the analysis information provided by the NWDAF network element as input for policy decision of the first control plane network element.

[0068] According to a sixth aspect of the present disclosure, a communication method is provided, the method comprising:

[0069] The third control plane network element receives a second indication message from the first control plane network element indicating that the slice data rate reaches a threshold;

[0070] In response to the second indication message, the UE-Slice-AMBR is changed.

[0071] In some embodiments, the second indication message includes at least one of the following information: S-NSSAI identifier, authorized UE-Slice-AMBR.

[0072] In some embodiments, the method further comprises:

[0073] The third control plane network element initiates a PDU session modification process to change the UE-Slice-AMBR.

[0074] According to a seventh aspect of the present disclosure, a communication device is provided, the device comprising:

[0075] A sending unit, configured to execute the SM policy association modification process initiated by the first control plane network element in response to the triggering of the policy decision, so as to notify the second control plane network element of the policy modification;

[0076] The processing unit is configured to use the actually used data rate as an input for policy decision if the data rate of the slice reaches a threshold, and reduce the session aggregation maximum bit rate Session-AMBR.

[0077] In some embodiments, the processing unit is further configured to:

[0078] Using the ratio of the actually used data rate to the accumulated data rate and the maximum bit rate MBR of the service data flow SDF as an input for the policy decision of the first control plane network element; or

[0079] using the user category as an input to a policy decision of the first control plane network element; or

[0080] using the application-based preferences as input to a policy decision of the first control plane network element; or

[0081] using user categories and application-based preferences as inputs to policy decisions of said first control plane network element; or

[0082] The analysis information provided by the network data analysis function NWDAF network element is used as input for the policy decision of the first control plane network element.

[0083] In some embodiments, the sending unit is further configured to:

[0084] A first indication message is sent to the second control plane network element, where the first indication message is used to indicate a modification of the SM policy association for reducing the Session-AMBR.

[0085] According to an eighth aspect of the present disclosure, a communication device is provided, the device comprising:

[0086] A sending unit, configured to execute the SM policy association modification process initiated by the first control plane network element in response to the triggering of the policy decision, so as to notify the second control plane network element of the policy modification;

[0087] The processing unit is configured to update the PCC rule of the first control plane network element if the data rate of the S-NSSAI reaches a threshold, and use the actually used data rate as an input for the policy decision of the first control plane network element.

[0088] In some embodiments, the processing unit is further configured to:

[0089] Using the ratio of the actual used data rate of the slice to the accumulated data rate and the maximum bit rate MBR of the service data flow SDF as an input for the policy decision of the first control plane network element; or

[0090] using the user category as an input to a policy decision of the first control plane network element; or

[0091] using the application-based preferences as input to a policy decision of the first control plane network element; or

[0092] using user categories and application-based preferences as inputs to policy decisions of said first control plane network element; or

[0093] The analysis information provided by the network data analysis function NWDAF network element is used as input for the policy decision of the first control plane network element.

[0094] According to a ninth aspect of the present disclosure, a communication device is provided, the device comprising:

[0095] A receiving unit, configured to receive a first indication message indicating that a data rate of the S-NSSAI reaches a threshold from a first control plane network element;

[0096] The processing unit is configured to change the Session-AMBR in response to the first indication message.

[0097] In some embodiments, the first indication message includes at least one of the following information: an S-NSSAI identifier, an authorized Session-AMBR;

[0098] In some embodiments, the apparatus further comprises:

[0099] The initiating unit is configured to initiate a PDU session modification process to change the UE-Slice-AMBR.

[0100] According to a tenth aspect of the present disclosure, a communication device is provided, the device comprising:

[0101] A receiving unit, configured to receive a first indication message indicating that a data rate of the S-NSSAI reaches a threshold from a first control plane network element;

[0102] The processing unit is configured to change the MBR and GBR corresponding to the SDF in response to the first indication message.

[0103] In some embodiments, the first indication message includes at least one of the following information: S-NSSAI identifier, SDF corresponding MBR and GBR.

[0104] In some embodiments, the processing unit is further configured to:

[0105] Execute the authorized QoS of the service data flow according to the PCC rules.

[0106] According to an eleventh aspect of the present disclosure, a communication device is provided, the device comprising:

[0107] A sending unit, configured to execute, in response to a trigger of a policy decision, an access and mobility AM policy association modification process initiated by the first control plane network element to notify the third control plane network element of the policy modification;

[0108] The processing unit is configured to reduce the user slice aggregation maximum bit rate UE-Slice-AMBR by the first control plane network element if the data rate of S-NSSAI reaches a threshold, and use the actually used data rate as an input for the policy decision of the first control plane network element.

[0109] In some embodiments, the processing unit is further configured to:

[0110] using the ratio of the actually used data rate to the accumulated data rate and the MBR of the SDF as an input to the policy decision of the first control plane network element; or

[0111] using the user category as an input to a policy decision of the first control plane network element; or

[0112] using the application-based preferences as input to a policy decision of the first control plane network element; or

[0113] using user categories and application-based preferences as inputs to policy decisions of said first control plane network element; or

[0114] The analysis information provided by the NWDAF network element is used as input for policy decision of the first control plane network element.

[0115] According to a twelfth aspect of the present disclosure, a communication device is provided, the device comprising:

[0116] A receiving unit, configured to receive, from the first control plane network element, a second indication message indicating that a data rate of the S-NSSAI reaches a threshold;

[0117] The processing unit is configured to change the UE-Slice-AMBR in response to the second indication message.

[0118] In some embodiments, the second indication message includes at least one of the following information: S-NSSAI identifier, authorized UE-Slice-AMBR.

[0119] In some embodiments, the apparatus further comprises:

[0120] The initiating unit is configured to initiate a PDU session modification process to change the UE-Slice-AMBR.

[0121] According to the thirteenth aspect of the present disclosure, a first network device is provided, comprising a processor, a transceiver, a memory, and an executable program stored in the memory and capable of being run by the processor, wherein the processor executes the steps of the communication method described in any one of the first aspect, the second aspect, or the fifth aspect when running the executable program.

[0122] According to the fourteenth aspect of the present disclosure, a second network device is provided, comprising a processor, a transceiver, a memory, and an executable program stored in the memory and capable of being run by the processor, wherein the processor executes the steps of the communication method described in any one of the third aspect or the fourth aspect when running the executable program.

[0123] According to the fifteenth aspect of the present disclosure, a third network device is provided, comprising a processor, a transceiver, a memory, and an executable program stored in the memory and capable of being run by the processor, wherein the processor executes the steps of any one of the communication methods described in the sixth aspect when running the executable program.

[0124] According to the sixteenth aspect of the present disclosure, a communication system is provided, the system comprising at least: a first control plane network element and a second control plane network element; wherein the first control plane network element is configured to initiate an SM policy association modification process to notify the second control plane network element of the policy modification with an authorized Session-AMBR when the data rate of the S-NSSAI reaches a threshold; the second control plane network element is configured to confirm the first control plane network element request and start a PDU session modification process to change the Session-AMBR.

[0125] According to the seventeenth aspect of the present disclosure, a communication system is provided, the system comprising at least: a first control plane network element and a second control plane network element; wherein the first control plane network element is configured as a PCF configured to initiate an SM policy association modification process to notify the second control plane network element of the modification of the policy with the SDF corresponding MBR and GBR when the data rate of the S-NSSAI reaches a threshold; the second control plane network element is configured to confirm the first control plane network element request and enforce the authorized QoS of the service data flow according to the PCC rules.

[0126] According to an eighteenth aspect of the present disclosure, there is provided a storage medium on which an executable program is stored, and when the executable program is executed by a processor, the steps of the communication method are implemented.

[0127] The communication method, apparatus and system, network device and storage medium of the embodiments of the present disclosure can determine the slice bandwidth control by PCF or other network elements based on the transmission rate of the current network slice using the actual data rate as input, and can accurately perform slice bandwidth control. The embodiments of the present disclosure can better provide a better access experience for the slice network. BRIEF DESCRIPTION OF THE DRAWINGS

[0128] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles of the embodiments of the present invention.

[0129] Figure 1 is a schematic structural diagram of a wireless communication system according to an exemplary embodiment;

[0130] Figure 2 is a flow chart of a communication method according to an exemplary embodiment;

[0131] Figure 3 is a flow chart of a communication method according to an exemplary embodiment;

[0132] Figure 4 is a flow chart of a communication method according to an exemplary embodiment;

[0133] Figure 5 is a flow chart of a communication method according to an exemplary embodiment;

[0134] Figure 6 is a schematic diagram of interactive communication between PCF and SMF according to an exemplary embodiment;

[0135] Figure 7 is a communication schematic diagram showing a UE requesting session establishment according to an exemplary embodiment;

[0136] Figure 8 is a communication schematic diagram of SM policy association termination according to an exemplary embodiment;

[0137] Fig. 9 is a flow chart of a communication method according to an exemplary embodiment;

[0138] Fig.10 is a flow chart of a communication method according to an exemplary embodiment;

[0139] Fig.11 is a communication diagram showing AM policy association modification according to an exemplary embodiment;

[0140] Fig.12is a communication diagram of AM policy association modification initiated by a PCF according to an exemplary embodiment;

[0141] Fig.13 is a schematic diagram of the structure of a communication device according to an exemplary embodiment;

[0142] Fig.14 is a schematic diagram of the structure of a communication device according to an exemplary embodiment;

[0143] Fig.15 is a schematic diagram of the structure of a communication device according to an exemplary embodiment;

[0144] Fig.16 is a schematic diagram of the structure of a communication device according to an exemplary embodiment;

[0145] Fig.17 is a schematic diagram of the structure of a communication device according to an exemplary embodiment;

[0146] Fig.18 The figure is a schematic diagram showing a structure of a user equipment according to an exemplary embodiment. DETAILED DESCRIPTION

[0147] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the embodiments of the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the embodiments of the present disclosure as detailed in the appended claims.

[0148] The terms used in the disclosed embodiments are only for the purpose of describing specific embodiments and are not intended to limit the disclosed embodiments. The singular forms of "a", "said" and "the" used in the disclosed embodiments and the appended claims are also intended to include plural forms unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0149] It should be understood that although the terms first, second, third, etc. may be used to describe various information in the disclosed embodiments, these information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the disclosed embodiments, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0150] Please refer to Figure 1 , which shows a schematic diagram of the structure of a wireless communication system provided by an embodiment of the present disclosure. Figure 1 As shown, the wireless communication system is a communication system based on cellular mobile communication technology, and the wireless communication system may include: a plurality of terminals 11 and a plurality of base stations 12 .

[0151] Among them, the terminal 11 can be a device that provides voice and / or data connectivity to the user. The terminal 11 can communicate with one or more core networks via a radio access network (RAN). The terminal 11 can be an Internet of Things terminal, such as a sensor device, a mobile phone (or a "cellular" phone), and a computer with an Internet of Things terminal. For example, it can be a fixed, portable, pocket-sized, handheld, computer-built-in or vehicle-mounted device. For example, a station (STA), a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, an access point, a remote terminal, an access terminal, a user terminal, a user agent, a terminal, or a user equipment (UE). Alternatively, the terminal 11 can also be a device of an unmanned aerial vehicle. Alternatively, the terminal 11 can also be a vehicle-mounted device, for example, it can be a driving computer with wireless communication function, or a wireless communication device connected to an external driving computer. Alternatively, the terminal 11 may also be a roadside device, for example, a street lamp, a signal lamp or other roadside device with a wireless communication function.

[0152] The base station 12 may be a network-side device in a wireless communication system. The wireless communication system may be a fourth generation mobile communication technology (4G) system, also known as a long term evolution (LTE) system; or, the wireless communication system may be a 5G system, also known as a new radio (NR) system or a 5G NR system. Alternatively, the wireless communication system may be any generation system. The access network in the 5G system may be referred to as NG-RAN (New Generation-Radio Access Network). Alternatively, an MTC system.

[0153] Among them, the base station 12 can be an evolved base station (eNB) adopted in the 4G system. Alternatively, the base station 12 can also be a base station (gNB) adopting a centralized distributed architecture in the 5G system. When the base station 12 adopts a centralized distributed architecture, it usually includes a centralized unit (CU) and at least two distributed units (DU). The centralized unit is provided with a packet data convergence protocol (PDCP) layer, a radio link layer control protocol (RLC) layer, and a media access control (MAC) layer protocol stack; the distributed unit is provided with a physical (Physical, PHY) layer protocol stack. The specific implementation method of the base station 12 is not limited in the embodiment of the present disclosure.

[0154] A wireless connection can be established between the base station 12 and the terminal 11 through a wireless air interface. In different implementations, the wireless air interface is a wireless air interface based on the fourth generation mobile communication network technology (4G) standard; or, the wireless air interface is a wireless air interface based on the fifth generation mobile communication network technology (5G) standard, for example, the wireless air interface is a new air interface; or, the wireless air interface can also be a wireless air interface based on the next generation mobile communication network technology standard of 5G.

[0155] In some embodiments, E2E (End to End) connections may also be established between the terminals 11, such as V2V (vehicle to vehicle) communication, V2I (vehicle to Infrastructure) communication, and V2P (vehicle to Pedestrian) communication in vehicle to everything (V2X) communication.

[0156] In some embodiments, the wireless communication system may further include a network management device 13 .

[0157] Several base stations 12 are respectively connected to a network management device 13. The network management device 13 may be a core network device in a wireless communication system. For example, the network management device 13 may be a mobility management entity (MME) in an evolved packet core (EPC). Alternatively, the network management device may be other core network devices, such as a serving gateway (SGW), a public data network gateway (PGW), a policy and charging rules function (PCRF), or a home subscriber server (HSS). The implementation form of the network management device 13 is not limited in the embodiments of the present disclosure.

[0158] The execution subjects involved in the embodiments of the present disclosure include, but are not limited to: a terminal (UE, User Equipment) in a cellular mobile communication system, and a base station of cellular mobile communication, etc.

[0159] The Policy Control Function (PCF) requests the AMF to report the Slice Maximum Bit Rate (MBR) assigned to the Subscription Permanent Identifier (SUPI) of each S-NSSAI with an Access and Mobility Policy Association established by activating the Policy Control Request Trigger. When the PCF receives and determines the Slice MBR for the SUPI of each S-NSSAI, the PCF subtracts the value of the Slice MBR from the Residual Data Rate and stores it.

[0160] If the remaining data rate of this S-NSSAI reaches the threshold, the PCF can terminate the access and mobility policy association with the AMF, or change the slice MBR value of the bronze user. The main problem with the current solution is that the PCF terminates the association or changes the slice MBR value based on the allocated data rate instead of the actual used data rate.

[0161] On one hand, the actual used data rate of some UEs almost reaches the allocated rate, but for other UEs, the amount of unused data rate is very large. On the other hand, the actual used data rate of bronze users may almost reach the allocated data rate, but for gold users, the amount of unused data rate may be very large.

[0162] In short, when the actual data rate resources are sufficient, the access and mobility policies are terminated, or the data rates of subscribers with lower priority are reduced. Obviously, this sliced ​​data rate resource allocation is extremely unreasonable.

[0163] The technical solution of the embodiment of the present disclosure is described in detail below to solve the above-mentioned problem of unreasonable data rate resource allocation.

[0164] Figure 2 is a flow chart of a communication method according to an exemplary embodiment. Figure 2 As shown, the communication method of the embodiment of the present disclosure is applied to the network device side, and the network device includes a control plane network element of a core network network element, etc. The communication method of the embodiment of the present disclosure includes the following processing steps:

[0165] Step 201: In response to triggering of a policy decision, a first control plane network element executes a session management SM policy association modification process initiated by itself to notify a second control plane network element of the policy modification.

[0166] In the embodiment of the present disclosure, as an implementation mode, the first control plane network element includes a policy control function (PCF, Policy Control Function) network element. The second control plane network element includes a session management function (SMF, Session Management Function) network element.

[0167] As an example, PCF initiates a Session Management (SM) Policy Association Modification process to downgrade the Session Aggregate Maximum Bite Rate (Session-AMBR) and uses the actual used data rate as input. PCF initiates the SM Policy Association Modification process based on internal PCF events or triggered by other peers of PCF such as Application Function (AF) network elements, Unified Data Repository (UDR), Network Data Analysis Function (NWDAF) network elements, etc.

[0168] Step 202: If the data rate of the slice reaches a threshold, the first control plane network element uses the actually used data rate as an input for policy decision-making to reduce the session aggregation maximum bit rate Session-AMBR.

[0169] In the disclosed embodiment, as an alternative, the first control plane network element uses the ratio of the actually used data rate to the accumulated data rate and the service data flow SDF maximum bit rate MBR as an input for the policy decision of the first control plane network element.

[0170] In the embodiment of the present disclosure, as an alternative, the first control plane network element uses the user category as an input for policy decision of the first control plane network element.

[0171] As an alternative, the first control plane network element uses the application-based preference as an input to a policy decision of the first control plane network element.

[0172] As an alternative, the first control plane network element uses the user category and the application-based preference as inputs to the policy decision of the first control plane network element.

[0173] In the embodiment of the present disclosure, the first control plane network element reduces the Session-AMBR, including:

[0174] The first control plane network element sends a first indication message to the second control plane network element, wherein the first indication message is used to indicate a SM policy association modification for reducing Session-AMBR. The first indication message includes at least one of the following information: S-NSSAI identifier, authorized Session-AMBR.

[0175] As an implementation manner, the first indication message includes a session management policy association modification message (SM PolicyAssociation Modification message).

[0176] As an implementation manner, the first control plane network element uses the analysis information provided by the NWDAF network element as input for policy decision making of the first control plane network element.

[0177] The communication method of the embodiment of the present disclosure can systematically and accurately realize dynamic adjustment of Session-AMBR to meet the data rate limit of each network slice, and can adjust the data rate of each network slice according to the actual data rate used.

[0178] Figure 3 is a flow chart of a communication method according to an exemplary embodiment. Figure 3As shown, the communication method of the embodiment of the present disclosure includes the following processing steps:

[0179] Step 301: A second control plane network element receives a first indication message from a first control plane network element indicating that a data rate of an S-NSSAI reaches a threshold.

[0180] The first indication message includes at least one of the following information: S-NSSAI identifier, authorized Session-AMBR.

[0181] Step 302: The second control plane network element changes the Session-AMBR in response to the first indication message.

[0182] The second control plane network element initiates a packet data unit PDU session modification process to change the Session-AMBR.

[0183] Here, the first indication message includes an SM Policy Association Modification message.

[0184] Figure 4 is a flow chart of a communication method according to an exemplary embodiment. Figure 4 As shown, the communication method of the embodiment of the present disclosure is applied to the network device side, and the network device includes a control plane network element of a core network network element, etc. The communication method of the embodiment of the present disclosure includes the following processing steps:

[0185] Step 401: In response to triggering of a policy decision, a first control plane network element executes a SM policy association modification process initiated by itself to notify a second control plane network element of the policy modification.

[0186] In the embodiment of the present disclosure, as an implementation mode, the first control plane network element includes a policy control function (PCF, Policy Control Function) network element. The second control plane network element includes a session management function (SMF, Session Management Function) network element.

[0187] As an example, PCF initiates a Session Management (SM) Policy Association Modification process to downgrade the Session Aggregate Maximum Bite Rate (Session-AMBR) and uses the actual used data rate as input. PCF initiates the SM Policy Association Modification process based on internal PCF events or triggered by other peers of PCF such as Application Function (AF) network elements, Unified Data Repository (UDR), Network Data Analysis Function (NWDAF) network elements, etc.

[0188] Step 402: If the data rate of the S-NSSAI reaches a threshold, the first control plane network element updates the policy and charging control PCC rule and uses the actually used data rate as an input for the policy decision of the first control plane network element.

[0189] The notifying the second control plane network element of the policy modification includes: the first control plane network element sending a first indication message to the second control plane network element, the first indication message being used to indicate reducing the MBR of the relevant QoS flow. The first indication message includes at least one of the following information: an S-NSSAI identifier, an MBR and a GBR corresponding to the SDF. The first indication message includes an SM Policy Association Modification message.

[0190] In an embodiment of the present disclosure, as an alternative, the first control plane network element uses the ratio of the actual used data rate of the slice to the accumulated data rate and the maximum bit rate MBR of the service data flow SDF as input for the policy decision of the first control plane network element.

[0191] In the embodiment of the present disclosure, as an alternative, the first control plane network element uses the user category as an input for policy decision of the first control plane network element.

[0192] As an alternative, the first control plane network element uses the application-based preference as an input to a policy decision of the first control plane network element.

[0193] As an alternative, the first control plane network element uses the user category and the application-based preference as inputs to the policy decision of the first control plane network element.

[0194] As an implementation manner, the first control plane network element uses the analysis information provided by the NWDAF network element as input for policy decision making of the first control plane network element.

[0195] Figure 5 is a flow chart of a communication method according to an exemplary embodiment. Figure 5 As shown, the communication method of the embodiment of the present disclosure includes the following processing steps:

[0196] Step 501: A second control plane network element receives a first indication message from a first control plane network element indicating that a data rate of an S-NSSAI reaches a threshold.

[0197] The first indication message includes at least one of the following information: S-NSSAI identifier, SDF corresponding MBR and GBR.

[0198] Step 502: The second control plane network element changes the MBR and GBR corresponding to the SDF in response to the first indication message.

[0199] Specifically, the second control plane network element enforces the authorized QoS of the service data flow according to the PCC rule.

[0200] Here, the first indication message includes an SM Policy Association Modification message.

[0201] Figure 6 FIG. 1 is a schematic diagram of PCF and SMF interactive communication according to an exemplary embodiment. Figure 6 As shown, the interactive communication between PCF and SMF in the embodiment of the present disclosure includes the following processing steps:

[0202] Step 1a, as an implementation, optionally, for example due to AF session signaling, the AF provides / revokes service information to the PCF by calling Npcf_PolicyAuthorization_Create Request or Npcf_PolicyAuthorization_Update Request service operations. The PCF responds to the AF to initiate Session-AMBR adjustment.

[0203] Step 1b, as another implementation, slice data rate analytics are exposed from NWDAF to PCF using NWDAF services. Analytics (such as Analytics ID) can be requested from NWDAF. Optionally, some internal events (such as timers or local decisions based on analytics information requested and received from NWDAF) occur at PCF, and PCF responds to NWDAF to initiate Session-AMBR adjustment.

[0204] Step 1c, as another implementation method, the UDR notifies the PCF of the policy subscription change by calling Nudr_DM_Notify (notification correlation ID, policy data, user permanent identification (SUPI), updated data, "PDU session policy control data" / "maximum data rate". The PCF responds to the UDR.

[0205] Steps 1a, 1b or 1c can be triggered by a local decision of the PCF or based on other peers of the PCF (e.g., AF, NWDAF, UDR). Before the triggering, the relevant network elements establish SM policy associations with the PCF. It is only necessary to ensure that the PCF can use the received relevant information in its subsequent policy decisions.

[0206] Step 2: PCF determines that the data rate of S-NSSAI reaches the threshold, then PCF uses the used data rate as input and makes a policy decision. PCF initiates session management policy association modification to downgrade Session-AMBR and adjust the slice data rate; or terminates the session management policy association for slice data rate control as needed.

[0207] Step 3, PCF executes the PCF-initiated SM policy association modification procedure to notify SMF of the policy modification; if the data rate used for S-NSSAI reaches the threshold, PCF may determine that the updated policy information (downgrade Session-AMBR, use the utilized data rate as input for its policy decision) needs to be sent to SMF. PCF may also decide to subscribe to a new Analytics ID from NWDAF.

[0208] If the AF provides the Background Data Transfer Reference ID in step 1a, the PCF can retrieve it from the UDR by calling the Nudr_DM_Query (BDT Reference ID, Policy Data, Background Data Transfer) service.

[0209] Step 4. If the PCF determines in step 3 that the SMF needs to update policy information, the PCF sends an Npcf_SMPolicyControl_UpdateNotify request with possible updated policy information about the PDU session, including the S-NSSAI identifier and the authorized Session-AMBR.

[0210] Step 5, SMF is informed of the PCF request through the Npcf_SMPolicyControl_UpdateNotify response. SMF can notify UPF and radio access network NG-RAN to reduce the session-AMBR for downlink and uplink respectively. When the UE sends uplink user plane data to NG-RAN, NG-RAN will enforce uplink data rate limitation for non-GBR flows according to the updated Session-AMBR value received from SMF. For GBR process, if one or more PCC rules are installed or activated in SMF, SMF may downgrade the corresponding MBR assigned to the SDF template.

[0211] If a Npcf_SMPolicyControl_UpdateNotify request is received from a new PCF instance in the PCF set, the SMF shall store the SM policy association with the new PCF instance.

[0212] As an alternative, see Figure 6 , PCF starts the SM policy association modification procedure to downgrade Session-AMBR. PCF can use the ratio of the actual used data rate to the accumulated data rate and the maximum bit rate MBR of the service data flow SDF as input. The specific processing steps include:

[0213] Step 1a, as an implementation, optionally, for example due to AF session signaling, the AF provides / revokes service information to the PCF by calling Npcf_PolicyAuthorization_Create Request or Npcf_PolicyAuthorization_Update Request service operations. The PCF responds to the AF to initiate Session-AMBR adjustment.

[0214] Step 1b, as another implementation, slice data rate analytics are exposed from NWDAF to PCF using NWDAF services. Analytics (such as Analytics ID) can be requested from NWDAF. Optionally, some internal events (such as timers or local decisions based on analytics information requested and received from NWDAF) occur at PCF, and PCF responds to NWDAF to initiate Session-AMBR adjustment.

[0215] Step 1c, as another implementation method, the UDR notifies the PCF of the policy subscription change by calling Nudr_DM_Notify (notification correlation ID, policy data, user permanent identification (SUPI), updated data, "PDU session policy control data" / "maximum data rate". The PCF responds to the UDR.

[0216] Steps 1a, 1b or 1c can be triggered by a local decision of the PCF or based on other peers of the PCF (e.g., AF, NWDAF, UDR). Before the triggering, the relevant network elements establish SM policy associations with the PCF. It is only necessary to ensure that the PCF can use the received relevant information in its subsequent policy decisions.

[0217] Step 2: PCF determines that the data rate of S-NSSAI reaches the threshold, then PCF takes the ratio of the actual used data rate to the accumulated data rate and the maximum bit rate MBR of the service data flow SDF as input and makes a policy decision. PCF initiates session management policy association modification to update the downgraded Session-AMBR and adjust the slice data rate; or terminates the session management policy association for slice data rate control as needed.

[0218] Step 3, PCF executes the PCF-initiated SM policy association modification procedure to notify SMF of the policy modification; if the data rate used for S-NSSAI reaches the threshold, PCF may determine that the updated policy information (downgrade Session-AMBR, use the utilized data rate as input for its policy decision) needs to be sent to SMF. PCF may also decide to subscribe to a new Analytics ID from NWDAF.

[0219] If the AF provides the Background Data Transfer Reference ID in step 1a, the PCF can retrieve it from the UDR by calling the Nudr_DM_Query (BDT Reference ID, Policy Data, Background Data Transfer) service.

[0220] Step 4. If the PCF determines in step 3 that the SMF needs to update policy information, the PCF sends an Npcf_SMPolicyControl_UpdateNotify request with possible updated policy information about the PDU session, including the S-NSSAI identifier and the authorized Session-AMBR.

[0221] Step 5, SMF is informed of the PCF request through the Npcf_SMPolicyControl_UpdateNotify response. SMF can notify UPF and radio access network NG-RAN to reduce the downlink and uplink session-AMBR respectively. When the UE sends uplink user plane data to NG-RAN, NG-RAN will enforce uplink data rate limitation for non-GBR flows according to the updated Session-AMBR value received from SMF. For GBR process, if one or more PCC rules are installed or activated in SMF, SMF may reduce the corresponding MBR allocated to the SDF template.

[0222] In this example, see Figure 6 , PCF starts the SM policy association modification process to downgrade Session-AMBR using the actual data rate and user category as input. The specific steps include:

[0223] Step 1a, as an implementation, optionally, for example due to AF session signaling, the AF provides / revokes service information to the PCF by calling Npcf_PolicyAuthorization_Create Request or Npcf_PolicyAuthorization_Update Request service operations. The PCF responds to the AF to initiate Session-AMBR adjustment.

[0224] Step 1b, as another implementation, slice data rate analytics are exposed from NWDAF to PCF using NWDAF services. Analytics (such as Analytics ID) can be requested from NWDAF. Optionally, some internal events (such as timers or local decisions based on analytics information requested and received from NWDAF) occur at PCF, and PCF responds to NWDAF to initiate Session-AMBR adjustment.

[0225] Step 1c, as another implementation method, the UDR notifies the PCF of the policy subscription change by calling Nudr_DM_Notify (notification correlation ID, policy data, user permanent identification (SUPI), updated data, "PDU session policy control data" / "maximum data rate". The PCF responds to the UDR.

[0226] Steps 1a, 1b or 1c can be triggered by a local decision of the PCF or based on other peers of the PCF (e.g., AF, NWDAF, UDR). Before the triggering, the relevant network elements establish SM policy associations with the PCF. It is only necessary to ensure that the PCF can use the received relevant information in its subsequent policy decisions.

[0227] Step 2: PCF determines that the data rate of S-NSSAI reaches the threshold, then PCF uses the actual used data rate and user category as input and makes a policy decision. PCF initiates session management policy association modification to update the downgraded Session-AMBR and adjust the slice data rate; or terminates the session management policy association for slice data rate control as needed.

[0228] Step 3, PCF executes the PCF-initiated SM policy association modification procedure to notify SMF of the policy modification; if the data rate used for S-NSSAI reaches the threshold, PCF may determine that the updated policy information (downgrade Session-AMBR, use the utilized data rate as input for its policy decision) needs to be sent to SMF. PCF may also decide to subscribe to a new Analytics ID from NWDAF.

[0229] If the AF provides the Background Data Transfer Reference ID in step 1a, the PCF can retrieve it from the UDR by calling the Nudr_DM_Query (BDT Reference ID, Policy Data, Background Data Transfer) service.

[0230] Step 4. If the PCF determines in step 3 that the SMF needs to update policy information, the PCF sends an Npcf_SMPolicyControl_UpdateNotify request with possible updated policy information about the PDU session, including the S-NSSAI identifier and the authorized Session-AMBR.

[0231] Step 5, SMF is informed of the PCF request through the Npcf_SMPolicyControl_UpdateNotify response. SMF can notify UPF and radio access network NG-RAN to reduce the downlink and uplink session-AMBR respectively. When the UE sends uplink user plane data to NG-RAN, NG-RAN will enforce uplink data rate limitation for non-GBR flows according to the updated Session-AMBR value received from SMF. For GBR process, if one or more PCC rules are installed or activated in SMF, SMF may reduce the corresponding MBR allocated to the SDF template.

[0232] In this example, see Figure 6 , PCF starts the SM policy association modification process to downgrade Session-AMBR using the actual used data rate and application-based preferences as input. The specific steps include:

[0233] Step 1a, as an implementation, optionally, for example due to AF session signaling, the AF provides / revokes service information to the PCF by calling Npcf_PolicyAuthorization_Create Request or Npcf_PolicyAuthorization_Update Request service operations. The PCF responds to the AF to initiate Session-AMBR adjustment.

[0234] Step 1b, as another implementation, slice data rate analytics are exposed from NWDAF to PCF using NWDAF services. Analytics (such as Analytics ID) can be requested from NWDAF. Optionally, some internal events (such as timers or local decisions based on analytics information requested and received from NWDAF) occur at PCF, and PCF responds to NWDAF to initiate Session-AMBR adjustment.

[0235] Step 1c, as another implementation method, the UDR notifies the PCF of the policy subscription change by calling Nudr_DM_Notify (notification correlation ID, policy data, user permanent identification (SUPI), updated data, "PDU session policy control data" / "maximum data rate". The PCF responds to the UDR.

[0236] Steps 1a, 1b or 1c can be triggered by a local decision of the PCF or based on other peers of the PCF (e.g., AF, NWDAF, UDR). Before the triggering, the relevant network elements establish SM policy associations with the PCF. It is only necessary to ensure that the PCF can use the received relevant information in its subsequent policy decisions.

[0237] Step 2: PCF determines that the data rate of S-NSSAI reaches the threshold, then PCF uses the actual used data rate and user category as input and makes a policy decision. PCF initiates session management policy association modification to update the downgraded Session-AMBR and adjust the slice data rate; or terminates the session management policy association for slice data rate control as needed.

[0238] Application-based preferences include timely and effective preferred applications, such as UE1 likes to use VR games during office breaks and likes to use streaming services during breaks after 9 pm. The application preference profile can be preset by the 5G system based on UE usage patterns, etc.

[0239] Step 3, PCF executes the PCF-initiated SM policy association modification procedure to notify SMF of the policy modification; if the data rate used for S-NSSAI reaches the threshold, PCF may determine that the updated policy information (downgrade Session-AMBR, use the utilized data rate as input for its policy decision) needs to be sent to SMF. PCF may also decide to subscribe to a new Analytics ID from NWDAF.

[0240] If the AF provides the Background Data Transfer Reference ID in step 1a, the PCF can retrieve it from the UDR by calling the Nudr_DM_Query (BDT Reference ID, Policy Data, Background Data Transfer) service.

[0241] Step 4. If the PCF determines in step 3 that the SMF needs to update policy information, the PCF sends an Npcf_SMPolicyControl_UpdateNotify request with possible updated policy information about the PDU session, including the S-NSSAI identifier and the authorized Session-AMBR.

[0242] Step 5, SMF is informed of the PCF request through the Npcf_SMPolicyControl_UpdateNotify response. SMF can notify UPF and radio access network NG-RAN to reduce the downlink and uplink session-AMBR respectively. When the UE sends uplink user plane data to NG-RAN, NG-RAN will enforce uplink data rate limitation for non-GBR flows according to the updated Session-AMBR value received from SMF. For GBR process, if one or more PCC rules are installed or activated in SMF, SMF may reduce the corresponding MBR allocated to the SDF template.

[0243] Figure 7 FIG. 1 is a communication diagram of a UE requesting session establishment according to an exemplary embodiment. Figure 7 As shown, the PDU session establishment and modification process requested by the UE with dynamic adjustment of the slice date rate in the embodiment of the present disclosure includes the following processing steps:

[0244] Step 1: PCF supports monitoring and enforcement of the total bandwidth of each S-NSSAI and can receive slice-specific policy control information for each S-NSSAI from UDR.

[0245] Step 2: UE initiates the PDU session establishment process, and the session establishment message includes S-NSSAI. (From UE to AMF, AMF selects SMF and initiates PDU session establishment, as described in TS 23.501, and the details are not repeated here).

[0246] In step 3, the SMF may perform the SM policy association establishment process to establish the SM policy association with the PCF and obtain the default PCC rules for the PDU session. If the request type in step 2 indicates "existing PDU session", the SMF may provide information about the policy control request trigger conditions that have been met by the SM policy association modification process initiated by the SMF. The SMF sends a data rate check request to the PCF, which includes the S-NSSAI, UE-ID, PDU session ID, session AMBR and MFBR values ​​of all GBR flows to be established.

[0247] Step 4: PCF checks whether the slice data rate of S-NSSAI reaches the threshold. The threshold can be set by the operator policy based on the total slice bandwidth. PCF subtracts the data rate of the S-NSSAI from the value of the authorized Session-AMBR assigned to the PDU session and stores it in the UDR.

[0248] Step 5, if the data rate of S-NSSAI does not reach the threshold, the PCF will provide the policy information of Session-AMBR or MBR for UL and / or DL ​​to the SMF. (Same as described in TS 23.503 and 23.502)

[0249] Step 6, SMF sends the PDU session response to the UE (same as described in TS 23.501, sent to the AMF and forwarded to the RAN and UE).

[0250] Step 7a, alternatively, use of NWDAF services is used to expose slice data rate analytics from NWDAF to PCF. Analytics (such as Analytics ID) can be requested from NWDAF. Optionally, some internal event occurs at PCF (such as a timer or local decision based on analytics information requested and received from NWDAF).

[0251] Step 7. If the data rate of S-NSSAI reaches the threshold, the PCF can use the actual used data rate as input and make a policy decision. The PCF initiates the session management policy association modification to update the downgraded Session-AMBR and adjust the slice data rate. The PCF executes the PCF-initiated SM policy association modification process to notify the SMF about the policy modification; the PCF can determine that the updated policy information (downgrade Session-AMBR / MBR, use the actual used data rate as input for its policy decision) needs to be sent to the SMF. The PCF may also decide to subscribe to a new Analytics ID from the NWDAF.

[0252] Step 9: If the PCF determines in step 8 that the SMF needs to update policy information, the PCF issues a Npcf_SMPolicyControl_UpdateNotify request for the PDU session, which includes the S-NSSAI identifier and the authorized Session-AMBR.

[0253] In step 10, SMF is notified of the PCF request through Npcf_SMPolicyControl_UpdateNotify. SMF can request the PDU session modification procedure to notify UPF and NG-RAN to reduce the Session-AMBR for downlink and uplink respectively. When the UE sends uplink user plane data to NG-RAN, NG-RAN will implement uplink data rate limitation for non-GBR flows according to the updated Session-AMBR value received from SMF, which is the same as in TS 23.501. For GBR procedures, if one or more PCC rules are installed or activated in SMF, SMF may reduce the corresponding MBR assigned to the SDF template.

[0254] Figure 8 is a communication diagram of SM policy association termination according to an exemplary embodiment. Figure 8 As shown, the session management policy termination of the embodiment of the present disclosure can be initiated by PCF or SMF:

[0255] In step 1 (including step 1a and step 1b), the PCF may call the Npcf_SMPolicyControl_UpdateNotify service operation to request the release of the PDU session. The SMF confirms the request.

[0256] Step 2: SMF may call Npcf_SMPolicyControl_Delete service operation to request deletion of SM policy association with PCF. SMF provides relevant operation information to PCF.

[0257] Step 3: When receiving the request from step 2, the PCF will find the PCC rules that need to be notified to the AF and delete the PCC rules of the PDU session.

[0258] If the PCC rule reported by the SMF has been deleted, and the PCF supports monitoring and enforcement of the total bandwidth of each S-NSSAI, the PCF shall update the data rate for that S-NSSAI in the UDR.

[0259] Step 4: SMF deletes all PDU session policy information associated with the PDU session.

[0260] In step 5, PCF may unsubscribe from NWDAF's analysis.

[0261] Step 6: PCF deletes the information related to the terminated PDU session and confirms to SMF that the PCF processing of the PDU session has been terminated. This interaction is a response to the SMF request in step 2.

[0262] Step 7: The PCF updates the data rate of the S-NSSAI in the UDR.

[0263] Step 8, having subscribed to notifications, the PCF may (for example, if it is the last PDU session on a (DNN, S-NSSAI) pair) unsubscribe from notifications of PDU session related data modifications from the UDR by calling Nudr_DM_Unsubscribe(Subscription Association ID).

[0264] Fig. 9 is a flow chart of a communication method according to an exemplary embodiment. Fig. 9 As shown, the communication method of the embodiment of the present disclosure includes:

[0265] Step 901: In response to triggering of a policy decision, the first control plane network element executes an access and mobility AM policy association modification process initiated by itself to notify the third control plane network element of the policy modification.

[0266] In the embodiment of the present disclosure, as an implementation mode, the first control plane network element includes a PCF, Policy Control Function network element. The third control plane network element includes an Access and Mobility Management Function (AMF, Access and Mobility Management Function) network element.

[0267] Step 902: If the data rate of S-NSSAI reaches the threshold, the first control plane network element reduces the user slice aggregation maximum bit rate UE-Slice-AMBR and uses the actually used data rate as the input of the policy decision of the first control plane network element.

[0268] The first control plane network element reduces the UE-Slice-AMBR, including:

[0269] The first control plane network element sends a second indication message to the third control plane network element, where the second indication message is used to indicate an AM policy association modification for reducing UE-Slice-AMBR.

[0270] The second indication message includes at least one of the following information: an S-NSSAI identifier and an authorized UE-Slice-AMBR.

[0271] The second indication message includes an access and mobility management policy association modification message (AM PolicyAssociation Modification message).

[0272] As an alternative, the first control plane network element uses the ratio of the actually used data rate to the accumulated data rate and the service data flow SDF maximum bit rate MBR as an input for the policy decision of the first control plane network element.

[0273] As an alternative, the first control plane network element uses the user category as an input for a policy decision of the first control plane network element.

[0274] As an alternative, the first control plane network element uses the application-based preference as an input to a policy decision of the first control plane network element.

[0275] As an alternative, the first control plane network element uses the user category and the application-based preference as inputs to the policy decision of the first control plane network element.

[0276] As an alternative, the first control plane network element uses the analysis information provided by the NWDAF network element as input for policy decision of the first control plane network element.

[0277] Fig.10 is a flow chart of a communication method according to an exemplary embodiment. Fig.10 As shown, the communication method of the embodiment of the present disclosure includes:

[0278] Step 1001: A third control plane network element receives a second indication message from a first control plane network element indicating that a data rate of an S-NSSAI reaches a threshold.

[0279] Here, the second indication message includes at least one of the following information: S-NSSAI identity, authorized UE-Slice-AMBR. The second indication message includes an AM Policy Association Modification message.

[0280] Step 1002: The third control plane network element changes the UE-Slice-AMBR in response to the indication message.

[0281] Specifically, the third control plane network element initiates a PDU session modification process to change the UE-Slice-AMBR.

[0282] The following details the AM policy association modification process initiated by AMF to reduce UE-Slice-AMBR using the actual used data rate as input. This process is applicable when the policy control request triggering conditions are met and the process is initiated by AMF.

[0283] Fig.11 is a communication diagram of AM policy association modification according to an exemplary embodiment. Fig.11 As shown, in non-roaming situations, the role of V-PCF is assumed by PCF. For roaming scenarios, V-PCF interacts with AMF.

[0284] The communication method of this example includes the following steps:

[0285] Step 1: When the policy control request triggering condition is met, the AMF will update the AM policy association by calling Npcf_AMPolicyControl_Update and provide information about the conditions that have changed to the PCF, such as UE-Slice-AMBR changes, the data rate of S-NSSAI reaches the threshold.

[0286] Step 2, (V-)PCF stores the information received in step 1 and makes policy decisions. In non-roaming situations, PCF can subscribe to Analytics from NWDAF.

[0287] If the data rate used for S-NSSAI reaches the threshold, the PCF can use the actual used data rate as input and make a policy decision. The PCF sends an AM policy association modification response to reduce the UE-Slice-AMBR, adjust the slice data rate, and the response includes the S-NSSAI identifier and the UE-Slice-AMBR. The input information can be in any of the following forms: actual used data rate, ratio of actual used data rate to cumulative data rate and MBR of each SDF in the network slice, user category and application-based preferences.

[0288] Step 3, (V) PCF responds to AMF with updated access and mobility related policy control information and updated policy control request trigger parameters.

[0289] Step 4: AMF deploys access and mobility control policies including storing the service area restrictions associated with the AM policy and the policy control request trigger, provides the service area restrictions to the UE and provides the RFSP index, UE-AMBR, MBR of UE-Slice-NG-RAN and the service area restrictions.

[0290] The following procedures apply to AM Policy Association modification initiated by PCF. The procedures driven by PCF internal events apply to both roaming and non-roaming scenarios, while when driven by NWDAF, apply only to non-roaming scenarios. In non-roaming scenarios, the role of V-PCF is assumed by PCF. For roaming scenarios, V-PCF interacts with AMF. V-PCF / PCF stores the access and mobility control policy information provided to AMF.

[0291] Fig.12 is a communication diagram of AM policy association modification initiated by PCF according to an exemplary embodiment. Fig.12 As shown, the AM strategy association modification process can be initiated by an internal PCF event or by PCF obtaining relevant analysis information from NWDAF. Specifically, it includes the following steps:

[0292] Step 1: The PCF internally determines that the new state of the UE context requires a new policy, which may be triggered by a notification from the UDR. It can also be triggered by obtaining relevant analysis information from the NWDAF.

[0293] Step 2, (V-)PCF makes policy decisions in roaming situations and PCF makes policy decisions in non-roaming situations. PCF can also decide to subscribe to a new Analytics ID from NWDAF.

[0294] If the data rate used for S-NSSAI reaches the threshold, the PCF can use the utilized data rate as input and make policy decisions. The PCF sends Npcf_AMPolicyControl_UpdateNotify to reduce the UE-Slice-AMBR, adjust the slice data rate, and the message sent includes the S-NSSAI identifier and the UE-Slice-AMBR. The input information can be in any of the following forms: actual used data rate, ratio of the actual used data rate to the accumulated data rate and the MBR of the SDF, user category and application-based preferences.

[0295] Step 3, the (V-)PCF in the roaming case and the PCF in the non-roaming case send Npcf_AMPolicyControl_UpdateNotify, and Npcf_AMPolicyControl_UpdateNotify includes the AM policy association ID related to the SUPI. The policy update may include service area restrictions, UE-AMBR, UE-Slice-MBR or RFSP index value. If the AF has previously subscribed to the event request for the result of allocating service area coverage in step 1, the (V-)PCF checks whether the allocated service area coverage has changed and sends the corresponding notification to the AF using Npcf_AMPolicyAuthorization_Notify, see the relevant definition in Section 6.3.1.18 of protocol TS 23.503

[20] .

[0296] Step 4: AMF deploys and stores updated access and mobility related policy information, including storing the service area restrictions and policy control request triggers associated with the AM policy, providing the service area restrictions to the UE, and providing the RFSP index, UE-Slice-MBR and NG-RAN service area restrictions.

[0297] Fig.13 is a schematic diagram showing the structure of a communication device according to an exemplary embodiment. Fig.13 As shown, the communication device of the embodiment of the present disclosure includes:

[0298] The sending unit 131 is configured to execute the SM policy association modification process initiated by the first control plane network element in response to the triggering of the policy decision, so as to notify the second control plane network element of the policy modification;

[0299] The processing unit 132 is configured to use the actually used data rate as an input for policy decision if the data rate of the slice reaches a threshold, and reduce the session aggregation maximum bit rate Session-AMBR.

[0300] As an implementation, the processing unit 132 is further configured to:

[0301] Using the ratio of the actually used data rate to the accumulated data rate and the maximum bit rate MBR of the service data flow SDF as an input for the policy decision of the first control plane network element; or

[0302] using the user category as an input to a policy decision of the first control plane network element; or

[0303] using the application-based preferences as input to a policy decision of the first control plane network element; or

[0304] using user categories and application-based preferences as inputs to policy decisions of said first control plane network element; or

[0305] The analysis information provided by the network data analysis function NWDAF network element is used as input for the policy decision of the first control plane network element.

[0306] As an implementation manner, the sending unit 131 is further configured to:

[0307] A first indication message is sent to the second control plane network element, where the first indication message is used to indicate a modification of the SM policy association for reducing the Session-AMBR.

[0308] In an exemplary embodiment, the sending unit 131, the processing unit 132, etc. can be implemented by one or more central processing units (CPU), graphics processing units (GPU), baseband processors (BP), application-specific integrated circuits (ASIC), digital signal processors (DSP), programmable logic devices (PLD), complex programmable logic devices (CPLD), field programmable gate arrays (FPGA), general-purpose processors, controllers, microcontrollers (MCU), microprocessors, or other electronic components, and can also be implemented in combination with one or more radio frequency (RF) antennas to execute the steps of the information dynamic indication method of the aforementioned embodiment.

[0309] In the embodiment of the present disclosure, the specific manner in which each unit in the illustrated communication device performs operations has been described in detail in the embodiment of the method, and will not be elaborated on here.

[0310] Fig.14 is a schematic diagram showing the structure of a communication device according to an exemplary embodiment. Fig.14 As shown, the communication device of the embodiment of the present disclosure includes:

[0311] The sending unit 141 is configured to execute the SM policy association modification process initiated by the first control plane network element in response to the triggering of the policy decision, so as to notify the second control plane network element of the policy modification;

[0312] The processing unit 142 is configured to update the PCC rule of the first control plane network element if the data rate of the S-NSSAI reaches a threshold, and use the actually used data rate as an input for the policy decision of the first control plane network element.

[0313] As an implementation, the processing unit 142 is further configured to:

[0314] Using the ratio of the actual used data rate of the slice to the accumulated data rate and the maximum bit rate MBR of the service data flow SDF as an input for the policy decision of the first control plane network element; or

[0315] using the user category as an input to a policy decision of the first control plane network element; or

[0316] using the application-based preferences as input to a policy decision of the first control plane network element; or

[0317] using user categories and application-based preferences as inputs to policy decisions of said first control plane network element; or

[0318] The analysis information provided by the network data analysis function NWDAF network element is used as input for the policy decision of the first control plane network element.

[0319] The sending unit 141 is further configured to:

[0320] A first indication message is sent to the second control plane network element, where the first indication message is used to indicate reducing the MBR of the relevant QoS flow.

[0321] In an exemplary embodiment, the sending unit 141, the processing unit 142, etc. can be implemented by one or more central processing units (CPU), graphics processing units (GPU), baseband processors (BP), application-specific integrated circuits (ASIC), digital signal processors (DSP), programmable logic devices (PLD), complex programmable logic devices (CPLD), field programmable gate arrays (FPGA), general-purpose processors, controllers, microcontrollers (MCU), microprocessors, or other electronic components, and can also be implemented in combination with one or more radio frequency (RF) antennas to execute the steps of the information dynamic indication method of the aforementioned embodiment.

[0322] In the embodiment of the present disclosure, the specific manner in which each unit in the illustrated communication device performs operations has been described in detail in the embodiment of the method, and will not be elaborated on here.

[0323] Fig.15 is a schematic diagram showing the structure of a communication device according to an exemplary embodiment. Fig.15 As shown, the communication device of the embodiment of the present disclosure includes:

[0324] The receiving unit 151 is configured to receive a first indication message indicating that a data rate of the S-NSSAI reaches a threshold from a first control plane network element;

[0325] The processing unit 152 is configured to change the Session-AMBR in response to the first indication message.

[0326] The first indication message includes at least one of the following information: S-NSSAI identifier and authorized Session-AMBR.

[0327] exist Fig.15 On the basis of the communication device shown in the figure, the communication device of the embodiment of the present disclosure further includes:

[0328] The initiating unit (not shown in the figure) is configured to initiate a PDU session modification process to change the Session-AMBR.

[0329] Alternatively, the first indication message includes at least one of the following information: S-NSSAI identifier, SDF corresponding MBR and GBR. Correspondingly, the processing unit 152 is further configured to: enforce the authorized QoS of the service data flow according to the PCC rule.

[0330] In an exemplary embodiment, the receiving unit 151, the processing unit 152, the initiating unit, etc. can be implemented by one or more central processing units (CPU), graphics processing units (GPU), baseband processors (BP), application-specific integrated circuits (ASIC), digital signal processors (DSP), programmable logic devices (PLD), complex programmable logic devices (CPLD), field programmable gate arrays (FPGA), general-purpose processors, controllers, microcontrollers (MCU), microprocessors, or other electronic components, and can also be implemented in combination with one or more radio frequency (RF) antennas to execute the steps of the information dynamic indication method of the aforementioned embodiment.

[0331] In the embodiment of the present disclosure, the specific manner in which each unit in the illustrated communication device performs operations has been described in detail in the embodiment of the method, and will not be elaborated on here.

[0332] The present disclosure also discloses a communication device, the device comprising:

[0333] A receiving unit, configured to receive a first indication message indicating that a data rate of the S-NSSAI reaches a threshold from a first control plane network element;

[0334] The processing unit is configured to change the MBR and GBR corresponding to the SDF in response to the first indication message.

[0335] The first indication message includes at least one of the following information: S-NSSAI identifier, SDF corresponding MBR and GBR. The processing unit is further configured to: execute authorized QoS of the service data flow according to the PCC rule.

[0336] Fig.16 is a schematic diagram showing the structure of a communication device according to an exemplary embodiment. Fig.16 As shown, the communication device of the embodiment of the present disclosure includes:

[0337] The sending unit 161 is configured to execute the access and mobility AM policy association modification process initiated by the first control plane network element in response to the triggering of the policy decision, so as to notify the third control plane network element of the policy modification;

[0338] The processing unit 162 is configured to reduce the user slice aggregation maximum bit rate UE-Slice-AMBR by the first control plane network element if the data rate of S-NSSAI reaches a threshold, and use the actually used data rate as an input for the policy decision of the first control plane network element.

[0339] As an implementation manner, the processing unit 162 is further configured to:

[0340] using the ratio of the actually used data rate to the accumulated data rate and the MBR of the SDF as an input to the policy decision of the first control plane network element; or

[0341] using the user category as an input to a policy decision of the first control plane network element; or

[0342] using the application-based preferences as input to a policy decision of the first control plane network element; or

[0343] using user categories and application-based preferences as inputs to policy decisions of said first control plane network element; or

[0344] The analysis information provided by the NWDAF network element is used as input for policy decision of the first control plane network element.

[0345] The sending unit 161 is further configured to: send a second indication message to the third control plane network element, where the second indication message is used to indicate the AM policy association modification of reducing the UE-Slice-AMBR.

[0346] In an exemplary embodiment, the sending unit 161, the processing unit 162, etc. can be implemented by one or more central processing units (CPU), graphics processing units (GPU), baseband processors (BP), application-specific integrated circuits (ASIC), digital signal processors (DSP), programmable logic devices (PLD), complex programmable logic devices (CPLD), field programmable gate arrays (FPGA), general-purpose processors, controllers, microcontrollers (MCU), microprocessors, or other electronic components, and can also be implemented in combination with one or more radio frequency (RF) antennas to execute the steps of the information dynamic indication method of the aforementioned embodiment.

[0347] In the embodiment of the present disclosure, the specific manner in which each unit in the illustrated communication device performs operations has been described in detail in the embodiment of the method, and will not be elaborated on here.

[0348] Fig.17 is a schematic diagram showing the structure of a communication device according to an exemplary embodiment. Fig.17 As shown, the communication device of the embodiment of the present disclosure includes:

[0349] The receiving unit 171 is configured to receive a second indication message indicating that a data rate of the S-NSSAI reaches a threshold from the first control plane network element;

[0350] The processing unit 172 is configured to change the UE-Slice-AMBR in response to the second indication message.

[0351] The second indication message includes at least one of the following information: S-NSSAI identifier and authorized UE-Slice-AMBR.

[0352] exist Fig.17 On the basis of the communication device shown in the figure, the communication device of the embodiment of the present disclosure further includes:

[0353] The initiating unit (not shown in the figure) is configured to initiate a PDU session modification process to change the UE-Slice-AMBR.

[0354] In an exemplary embodiment, the receiving unit 171, the processing unit 172, the initiating unit, etc. can be implemented by one or more central processing units (CPU), graphics processing units (GPU), baseband processors (BP), application-specific integrated circuits (ASIC), digital signal processors (DSP), programmable logic devices (PLD), complex programmable logic devices (CPLD), field programmable gate arrays (FPGA), general-purpose processors, controllers, microcontrollers (MCU), microprocessors, or other electronic components, and can also be implemented in combination with one or more radio frequency (RF) antennas to execute the steps of the information dynamic indication method of the aforementioned embodiment.

[0355] In the embodiment of the present disclosure, the specific manner in which each unit in the illustrated communication device performs operations has been described in detail in the embodiment of the method, and will not be elaborated on here.

[0356] The disclosed embodiment also records a first network device such as a PCF, including a processor, a transceiver, a memory, and an executable program stored in the memory and capable of being run by the processor, and the processor executes the steps of the communication method of the aforementioned embodiment when running the executable program.

[0357] The embodiment of the present disclosure also records a second network device such as SMF, including a processor, a transceiver, a memory, and an executable program stored in the memory and capable of being run by the processor, and the processor executes the steps of the communication method when running the executable program.

[0358] The disclosed embodiment also records a third network device such as AMF, including a processor, a transceiver, a memory, and an executable program stored in the memory and capable of being run by the processor, and the processor executes the steps of the communication method when running the executable program.

[0359] The disclosed embodiment also records a communication system, which includes at least: a first control plane network element and a second control plane network element; wherein the first control plane network element is configured to initiate an SM policy association modification process to notify the second control plane network element of the policy modification with an authorized Session-AMBR when the data rate of the S-NSSAI reaches a threshold; the second control plane network element is configured to confirm the first control plane network element request and start a PDU session modification process to change the Session-AMBR.

[0360] The disclosed embodiment also records another communication system, which includes at least: a first control plane network element and a second control plane network element; wherein the first control plane network element is configured as a PCF configured to initiate an SM policy association modification process to notify the second control plane network element of the modification of the policy with the MBR and GBR corresponding to the SDF when the data rate of the S-NSSAI reaches a threshold; the second control plane network element is configured to confirm the request of the first control plane network element and enforce the authorized QoS of the service data flow according to the PCC rules.

[0361] As an implementation manner, the first control plane network element of the embodiment of the present disclosure includes a PCF and a second control plane network element SMF.

[0362] Fig.18 8000 is a block diagram of a user device 8000 according to an exemplary embodiment. For example, the user device 8000 may be a mobile phone, a computer, a digital broadcast terminal, a messaging device, a game console, a tablet device, a medical device, a fitness device, a personal digital assistant, etc.

[0363] Reference Fig.18 , the user device 8000 may include one or more of the following components: a processing component 8002 , a memory 8004 , a power component 8006 , a multimedia component 8008 , an audio component 8010 , an input / output (I / O) interface 8012 , a sensor component 8014 , and a communication component 8016 .

[0364] The processing component 8002 generally controls the overall operation of the user device 8000, such as operations associated with display, phone calls, data communications, camera operations, and recording operations. The processing component 8002 may include one or more processors 8020 to execute instructions to complete all or part of the steps of the above-mentioned method. In addition, the processing component 8002 may include one or more modules to facilitate the interaction between the processing component 8002 and other components. For example, the processing component 8002 may include a multimedia module to facilitate the interaction between the multimedia component 8008 and the processing component 8002.

[0365] The memory 8004 is configured to store various types of data to support operations on the user device 8000. Examples of such data include instructions for any application or method operating on the user device 8000, contact data, phone book data, messages, pictures, videos, etc. The memory 8004 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk or optical disk.

[0366] The power supply component 8006 provides power to various components of the user device 8000. The power supply component 8006 can include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power to the user device 8000.

[0367] The multimedia component 8008 includes a screen that provides an output interface between the user device 8000 and the user. In some embodiments, the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive input signals from the user. The touch panel includes one or more touch sensors to sense touch, slide, and gestures on the touch panel. The touch sensor may not only sense the boundaries of the touch or slide action, but also detect the duration and pressure associated with the touch or slide operation. In some embodiments, the multimedia component 8008 includes a front camera and / or a rear camera. When the user device 8000 is in an operating mode, such as a shooting mode or a video mode, the front camera and / or the rear camera may receive external multimedia data. Each front camera and rear camera may be a fixed optical lens system or have a focal length and optical zoom capability.

[0368] The audio component 8010 is configured to output and / or input audio signals. For example, the audio component 8010 includes a microphone (MIC), and when the user device 8000 is in an operation mode, such as a call mode, a recording mode, and a speech recognition mode, the microphone is configured to receive an external audio signal. The received audio signal can be further stored in the memory 8004 or sent via the communication component 8016. In some embodiments, the audio component 8010 also includes a speaker for outputting audio signals.

[0369] The I / O interface 8012 provides an interface between the processing component 8002 and the peripheral interface module, which may be a keyboard, a click wheel, buttons, etc. These buttons may include but are not limited to: a home button, a volume button, a start button, and a lock button.

[0370] The sensor assembly 8014 includes one or more sensors for providing various aspects of status assessment for the user device 8000. For example, the sensor assembly 8014 can detect the open / closed state of the user device 8000, the relative positioning of components, such as the display and keypad of the user device 8000, and the sensor assembly 8014 can also detect the position change of the user device 8000 or a component of the user device 8000, the presence or absence of contact between the user and the user device 8000, the orientation or acceleration / deceleration of the user device 8000, and the temperature change of the user device 8000. The sensor assembly 8014 may include a proximity sensor configured to detect the presence of nearby objects without any physical contact. The sensor assembly 8014 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 8014 may also include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

[0371] The communication component 8016 is configured to facilitate wired or wireless communication between the user device 8000 and other devices. The user device 8000 can access a wireless network based on a communication standard, such as Wi-Fi, 2G or 3G, or a combination thereof. In an exemplary embodiment, the communication component 8016 receives a broadcast signal or broadcast-related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 8016 also includes a near field communication (NFC) module to facilitate short-range communication. For example, the NFC module can be implemented based on radio frequency identification (RFID) technology, infrared data association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology and other technologies.

[0372] In an exemplary embodiment, the user device 8000 can be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors or other electronic components to execute the steps of the above-mentioned information dynamic indication method.

[0373] In an exemplary embodiment, a non-transitory computer-readable storage medium including instructions is also provided, such as a memory 8004 including instructions, and the instructions can be executed by the processor 8020 of the user device 8000 to complete the steps of the above-mentioned information dynamic indication method. For example, the non-transitory computer-readable storage medium can be a ROM, a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, etc.

[0374] The embodiment of the present disclosure also records a storage medium on which an executable program is stored, and the executable program is executed by a processor to execute the steps of the communication method of the above embodiment.

[0375] Those skilled in the art will readily appreciate other implementations of the embodiments of the present invention after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the embodiments of the present invention that follow the general principles of the embodiments of the present invention and include common knowledge or customary technical means in the art that are not disclosed in the embodiments of the present disclosure. The specification and examples are to be regarded as exemplary only, and the true scope and spirit of the embodiments of the present invention are indicated by the following claims.

[0376] It should be understood that the embodiments of the present invention are not limited to the precise structures described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the embodiments of the present invention is limited only by the appended claims.

Claims

1. A communication method, wherein: The method is performed by a first control plane network element and includes: In response to the triggering of the policy decision, a session management SM policy association modification process is initiated to notify the second control plane network element of the policy modification; The policy decision includes: if the remaining data rate of the slice reaches a threshold, using the actually used data rate as an input to the policy decision, reducing the authorized session aggregation maximum bit rate Session-AMBR; wherein the remaining data rate of the slice is the maximum bit rate MBR allocated to the slice minus the AMBR of the session authorized in the slice; The actually used data rate is determined based on analysis information provided by a network data analysis function NWDAF network element.

2. The method according to claim 1, wherein: The method further comprises: The ratio of the actually used data rate to the accumulated data rate and the maximum bit rate MBR of the service data flow SDF is used as an input for the policy decision of the first control plane network element.

3. The method according to claim 1, wherein: The method further comprises: The user category is used as an input to a policy decision of the first control plane network element.

4. The method according to claim 1, wherein: The method further comprises: The application-based preferences are used as input to a policy decision of the first control plane network element.

5. The method according to claim 2, wherein: The method further comprises: The user categories and application-based preferences are used as inputs to policy decisions of the first control plane network element.

6. The method according to any one of claims 1 to 5, wherein: The step of reducing the authorized session aggregation maximum bit rate Session-AMBR includes: A first indication message is sent to the second control plane network element, where the first indication message is used to indicate a modification of the SM policy association for reducing the authorized Session-AMBR.

7. The method according to claim 6, wherein: The first indication message includes at least one of the following information: S-NSSAI identifier, authorized Session-AMBR.

8. The method according to any one of claims 1 to 7, wherein: The method further comprises: The analysis information provided by the network data analysis function NWDAF network element is used as input for the policy decision of the first control plane network element.

9. A communication method, wherein: The method is performed by a first control plane network element and includes: In response to the triggering of the policy decision, the SM policy association modification process is initiated to notify the second control plane network element of the policy modification; The policy decisions include: If the remaining data rate of the slice identified by the S-NSSAI reaches the threshold, the actually used data rate is used as an input for the policy decision of the first control plane network element to update the policy and charging control PCC rule; The actually used data rate is determined based on the analysis information provided by the network data analysis function NWDAF network element; the remaining data rate of the slice is the maximum bit rate MBR allocated to the slice minus the AMBR of the authorized session in the slice.

10. The method according to claim 9, wherein: The method further comprises: The ratio of the actually used data rate of the slice to the accumulated data rate and the maximum bit rate MBR of the service data flow SDF is used as input for the policy decision of the first control plane network element.

11. The method according to claim 9, wherein: The method further comprises: The user category is used as an input to a policy decision of the first control plane network element.

12. The method according to claim 9, wherein: The method further comprises: The application-based preferences are used as input to a policy decision of the first control plane network element.

13. The method according to claim 10, wherein: The method further comprises: User categories and application-based preferences are used as inputs for policy decisions of the first control plane network element.

14. The method according to any one of claims 9 to 13, wherein: The notifying the second control plane network element of the modification of the policy includes: The first control plane network element sends a first indication message to the second control plane network element, where the first indication message is used to indicate reducing the MBR of the relevant QoS flow.

15. The method according to claim 14, wherein: The first indication message includes at least one of the following information: an S-NSSAI identifier, an MBR corresponding to the SDF, and a guaranteed bit rate GBR.

16. The method according to any one of claims 9 to 15, wherein: The method further comprises: The analysis information provided by the NWDAF network element is used as input for policy decision of the first control plane network element.

17. A communication method, performed by a second control plane network element, the method comprising: Receiving a first indication message from a first control plane network element; The first indication message is a message sent by the first control plane network element in response to triggering a policy decision; The policy decision includes: if the remaining data rate of the slice reaches a threshold, the actually used data rate is used as an input for the policy decision to reduce the authorized session aggregation maximum bit rate Session-AMBR; wherein the remaining data rate of the slice is the maximum bit rate MBR allocated to the slice minus the AMBR of the authorized session in the slice; wherein the actually used data rate is determined based on analysis information provided by the network data analysis function NWDAF network element; and in response to the first indication message, the authorized session aggregation maximum bit rate Session-AMBR is changed.

18. The method according to claim 17, wherein: The first indication message includes at least one of the following information: S-NSSAI identifier, authorized Session-AMBR.

19. The method according to claim 18, wherein: The method further comprises: Initiate the packet data unit (PDU) session modification process to change the Session-AMBR.

20. A communication method, wherein: The method is performed by a second control plane network element, and includes: A first indication message received from a first control plane network element; the first indication message is a message sent by the first control plane network element in response to a trigger of a policy decision; the policy decision comprises: when the remaining rate of a slice reaches a threshold, using the actually used data rate as an input of the policy decision of the first control plane network element, and updating the policy and charging control PCC rule; wherein the remaining data rate of the slice is the maximum bit rate MBR allocated to the slice minus the AMBR of the authorized session in the slice; wherein the actually used data rate is determined according to analysis information provided by a network data analysis function NWDAF network element; In response to the first indication message, the MBR and GBR of the SDF's corresponding authorization are changed.

21. The method according to claim 20, wherein: The first indication message includes at least one of the following information: S-NSSAI identifier, SDF corresponding MBR and GBR.

22. The method according to claim 21, wherein: The method further comprises: Execute the authorized QoS of the service data flow according to the PCC rules.

23. A communication method, wherein: The method is performed by a first control plane network element and includes: In response to the triggering of the policy decision, an access and mobility AM policy association modification process is initiated to notify the third control plane network element of the policy modification; The policy decisions include: If the remaining data rate of the slice identified by the S-NSSAI reaches a threshold, the UE-Slice-AMBR authorized for the maximum bit rate of the user slice aggregation is reduced, and the actually used data rate is used as an input for the policy decision of the first control plane network element; wherein the remaining data rate of the slice is the maximum bit rate MBR allocated to the slice minus the AMBR of the authorized session in the slice; The actually used data rate is determined based on analysis information provided by a network data analysis function NWDAF network element.

24. The method according to claim 23, wherein: The method further comprises: The ratio of the actually used data rate to the accumulated data rate and the MBR of the SDF is used as an input for the policy decision of the first control plane network element.

25. The method according to claim 23, wherein: The method further comprises: The user category is used as an input to a policy decision of the first control plane network element.

26. The method of claim 23, wherein: The method further comprises: The application-based preferences are used as input to a policy decision of the first control plane network element.

27. The method according to claim 24, wherein: The method further comprises: The user categories and application-based preferences are used as inputs to policy decisions of the first control plane network element.

28. The method according to any one of claims 23 to 27, wherein: The first control plane network element reduces the UE-Slice-AMBR, including: A second indication message is sent to the third control plane network element, where the second indication message is used to indicate the AM policy association modification of reducing the UE-Slice-AMBR.

29. The method according to claim 28, wherein: The second indication message includes at least one of the following information: an S-NSSAI identifier and an authorized UE-Slice-AMBR.

30. The method according to any one of claims 23 to 29, wherein: The method further comprises: The analysis information provided by the NWDAF network element is used as input for policy decision of the first control plane network element.

31. A communication method, wherein: Executed by a third control plane network element, the method includes: Receiving a second indication message indicating that a slice data rate reaches a threshold from a first control plane network element; the second indication message is a message sent by the first control plane network element in response to a trigger of a policy decision; the policy decision includes: if the remaining data rate of the slice identified by the S-NSSAI reaches a threshold, reducing the UE-Slice-AMBR authorized for the maximum bit rate of the user slice aggregation, and using the actually used data rate as an input to the policy decision of the first control plane network element; wherein the actually used data rate is determined according to analysis information provided by a network data analysis function NWDAF network element; wherein the remaining data rate of the slice is the maximum bit rate MBR allocated to the slice minus the AMBR of the session authorized in the slice; In response to the second indication message, the authorized UE-Slice-AMBR is changed.

32. The method according to claim 31, wherein: The second indication message includes at least one of the following information: an S-NSSAI identifier and an authorized UE-Slice-AMBR.

33. The method of claim 32, wherein: The method further comprises: Initiate the PDU session modification process to change the UE-Slice-AMBR.

34. A communication device, wherein: The communication device corresponds to a first control plane network element, and the device includes: A sending unit, configured to initiate an SM policy association modification process in response to a trigger of a policy decision, so as to notify the second control plane network element of the policy modification; A processing unit is configured to execute the policy decision; the policy decision includes: if the remaining data rate of the slice reaches a threshold, the actually used data rate is used as an input for the policy decision to reduce the authorized session aggregation maximum bit rate Session-AMBR; wherein the remaining data rate of the slice is the maximum bit rate MBR allocated to the slice minus the AMBR of the authorized session in the slice; wherein the actually used data rate is determined based on the analysis information provided by the network data analysis function NWDAF network element.

35. The device according to claim 34, wherein The processing unit is further configured as: Using the ratio of the actually used data rate to the accumulated data rate and the maximum bit rate MBR of the service data flow SDF as an input for the policy decision of the first control plane network element; or using the user category as an input to a policy decision of the first control plane network element; or using the application-based preferences as input to a policy decision of the first control plane network element; or Using user categories and application-based preferences as inputs to policy decisions of the first control plane network element; or The analysis information provided by the network data analysis function NWDAF network element is used as input for the policy decision of the first control plane network element.

36. A communication device, wherein: The communication device corresponds to a first control plane network element, and the device includes: A sending unit, configured to initiate an SM policy association modification process in response to a trigger of a policy decision, so as to notify the second control plane network element of the policy modification; a processing unit configured to execute the policy decision; The strategy decision includes: If the remaining data rate of the slice identified by the S-NSSAI reaches a threshold, the actually used data rate is used as an input for the policy decision of the first control plane network element to update the policy and charging control PCC rule; wherein the remaining data rate of the slice is the maximum bit rate MBR allocated to the slice minus the AMBR of the authorized session in the slice; The actually used data rate is determined based on analysis information provided by a network data analysis function NWDAF network element.

37. The device according to claim 36, wherein The processing unit is further configured as: Using the ratio of the actually used data rate of the slice to the accumulated data rate and the maximum bit rate MBR of the service data flow SDF as an input for the policy decision of the first control plane network element; or using the user category as an input to a policy decision of the first control plane network element; or using the application-based preferences as input to a policy decision of the first control plane network element; or Using user categories and application-based preferences as inputs to policy decisions of the first control plane network element; or The analysis information provided by the network data analysis function NWDAF network element is used as input for the policy decision of the first control plane network element.

38. A communication device, wherein: The device comprises: A receiving unit is configured to receive a first indication message from a first control plane network element; the first indication message is a message sent by the first control plane network element in response to a trigger of a policy decision; the policy decision includes: if the remaining data rate of a slice reaches a threshold, the actually used data rate is used as an input for the policy decision to reduce the authorized session aggregation maximum bit rate Session-AMBR; wherein the actually used data rate is determined based on analysis information provided by a network data analysis function NWDAF network element; wherein the remaining data rate of the slice is the maximum bit rate MBR allocated to the slice minus the AMBR of the authorized session in the slice; a processing unit is configured to change the authorized session aggregation maximum bit rate Session-AMBR in response to the first indication message.

39. The device according to claim 38, wherein The first indication message includes at least one of the following information: an S-NSSAI identifier and an authorized Session-AMBR; Correspondingly, the device further includes: The initiating unit is configured to initiate a PDU session modification process to change the Session-AMBR.

40. A communication device, the device comprising: A receiving unit, configured to receive a first indication message from a first control plane network element; The first indication message is a message sent by the first control plane network element in response to triggering a policy decision; The policy decision includes: if the remaining data rate of the slice reaches a threshold, the actually used data rate is used as an input for the policy decision to reduce the authorized session aggregation maximum bit rate Session-AMBR; wherein the remaining data rate of the slice is the maximum bit rate MBR allocated to the slice minus the AMBR of the authorized session in the slice; wherein the actually used data rate is determined based on the analysis information provided by the network data analysis function NWDAF network element; the processing unit is configured to change the corresponding authorized MBR and GBR of the SDF in response to the first indication message.

41. The device according to claim 40, wherein The first indication message includes at least one of the following information: S-NSSAI identifier, SDF corresponding MBR and GBR; Correspondingly, the processing unit is further configured to: execute authorized QoS of the service data flow according to the PCC rule.

42. A communication device, wherein: The communication device corresponds to a first control plane network element, and the device includes: A sending unit, configured to initiate an access and mobility AM policy association modification process in response to a trigger of a policy decision, so as to notify the third control plane network element of the policy modification; The processing unit is configured to execute the policy decision, and the policy decision includes: if the remaining data rate of the slice identified by the S-NSSAI reaches a threshold, the UE-Slice-AMBR authorized for the maximum bit rate of the user slice aggregation is reduced, and the actually used data rate is used as the input of the policy decision of the first control plane network element; wherein the remaining data rate of the slice is the maximum bit rate MBR allocated to the slice minus the AMBR of the authorized session in the slice.

43. The device according to claim 42, wherein: The processing unit is further configured as: using the ratio of the actually used data rate to the accumulated data rate and the MBR of the SDF as an input for a policy decision of the first control plane network element; or using the user category as an input to a policy decision of the first control plane network element; or using the application-based preferences as input to a policy decision of the first control plane network element; or Using user categories and application-based preferences as inputs to policy decisions of the first control plane network element; or The analysis information provided by the NWDAF network element is used as input for policy decision of the first control plane network element.

44. A communication device, wherein: The device comprises: A receiving unit configured to receive a second indication message from a first control plane network element; the second indication message is a message sent by the first control plane network element in response to a trigger of a policy decision; the policy decision includes: if the remaining data rate of the slice identified by the S-NSSAI reaches a threshold, the UE-Slice-AMBR authorized for the maximum bit rate of the user slice aggregation is reduced, and the actually used data rate is used as an input for the policy decision of the first control plane network element; wherein the remaining data rate of the slice is the maximum bit rate MBR allocated to the slice minus the AMBR of the authorized session in the slice; wherein the actually used data rate is determined according to analysis information provided by the network data analysis function NWDAF network element; The processing unit is configured to change the authorized UE-Slice-AMBR in response to the second indication message.

45. The device according to claim 44, wherein The second indication message includes at least one of the following information: an S-NSSAI identifier and an authorized UE-Slice-AMBR; Correspondingly, the device further includes: The initiating unit is configured to initiate a PDU session modification process to change the UE-Slice-AMBR.

46. ​​A first network device, comprising a processor, a transceiver, a memory, and an executable program stored in the memory and capable of being run by the processor, wherein the processor executes the steps of the communication method as described in any one of claims 1 to 16 or 23 to 30 when running the executable program.

47. A second network device, comprising a processor, a transceiver, a memory, and an executable program stored in the memory and capable of being run by the processor, wherein the processor executes the steps of the communication method according to any one of claims 17 to 22 when running the executable program.

48. A third network device, comprising a processor, a transceiver, a memory, and an executable program stored in the memory and capable of being run by the processor, wherein the processor executes the steps of the communication method according to any one of claims 31 to 33 when running the executable program.

49. A communication system, the system comprising at least: A first control plane network element and a second control plane network element; wherein the first control plane network element is configured to initiate an SM policy association modification process to notify the second control plane network element of the policy modification using the authorized Session-AMBR when the remaining data rate of the slice identified by the S-NSSAI reaches a threshold; wherein the remaining data rate of the slice is the maximum bit rate MBR allocated to the slice minus the AMBR of the authorized session in the slice; the second control plane network element is configured to confirm the request of the first control plane network element and start a PDU session modification process to change the Session-AMBR.

50. A communication system, the system comprising at least: A first control plane network element and a second control plane network element; wherein the first control plane network element is configured to initiate an SM policy association modification process to notify the second control plane network element of the policy modification using the SDF corresponding MBR and GBR when the remaining data rate of the slice identified by the S-NSSAI reaches a threshold; wherein the remaining data rate of the slice is the maximum bit rate MBR allocated to the slice minus the AMBR of the authorized session in the slice; the second control plane network element is configured to confirm the request of the first control plane network element and enforce the authorized QoS of the service data flow according to the PCC rule.

51. A storage medium having an executable program stored thereon, wherein the executable program, when executed by a processor, implements the steps of the communication method according to any one of claims 1 to 33.

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