CN116321278A

CN116321278A - Congestion control method, system, electronic device and storage medium

Info

Publication number: CN116321278A
Application number: CN202111509237.9A
Authority: CN
Inventors: 孔振岗; 曹义林; 王斌; 徐林
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2021-12-10
Filing date: 2021-12-10
Publication date: 2023-06-23
Also published as: WO2023103729A1

Abstract

The embodiment of the application relates to the technical field of wireless communication, in particular to a congestion control method, a congestion control system, electronic equipment and a storage medium. The congestion control method comprises the following steps: receiving user plane data and a Radius message of User Equipment (UE), wherein the Radius message comprises an access type of the UE; performing Round Trip Time (RTT) measurement on the UE according to the user plane data, and acquiring an RTT value of the UE; when the RTT value meets a preset congestion threshold value, generating a UE speed limit request according to the RTT value and the UE access type, wherein the UE speed limit request comprises speed limit information; and sending the UE speed limit request to a policy control function PCF or a policy and charging control function PCRF through a public interface so that the PCF or the PCRF searches the speed limit rate corresponding to the speed limit information in a corresponding relation table of the speed limit information and the speed limit rate, and limits the speed of the UE according to the speed limit rate to complete the congestion control of the UE. Because no private interface exists, the method and the device can be applied to a cross-manufacturer equipment networking environment, and have good universality.

Description

Congestion control method, system, electronic device and storage medium

Technical Field

The embodiment of the application relates to the technical field of wireless communication, in particular to a congestion control method, a congestion control system, electronic equipment and a storage medium.

Background

To implement congestion control of a mobile network, the 3GPP standard introduces a radio congestion awareness function (RAN Congestion Awareness Function, abbreviated RCAF) at R13 and a network data analysis function (Network Data Analytics Function, abbreviated NWDAF) at R15, both of which provide radio access network (Radio Access Network, abbreviated RAN) user plane congestion information to a policy control function (Policy Control Function, abbreviated PCF) or a policy and charging control function (Policy and Charging Rule Function, abbreviated PCRF) to enable the PCF or PCRF to consider the RAN user plane congestion status as a factor for determining the policy.

However, no commercially available RCAF or NWDAF is currently available to a device manufacturer, and some device manufacturers implement congestion reporting and control through a private protocol, which has no generality and cannot be applied to a cross-manufacturer device, so that implementation of congestion reporting and control has a certain limitation.

Disclosure of Invention

The embodiment of the application mainly aims to provide a congestion control method, a congestion control system, electronic equipment and a storage medium. The congestion control method can be applied in a cross-manufacturer equipment networking environment, and has good universality.

In order to achieve the above object, an embodiment of the present application provides a congestion control method, including: receiving user plane data of User Equipment (UE) and a remote authentication dial-up user service Radius message, wherein the Radius message comprises an access type of the UE; performing Round Trip Time (RTT) measurement on the UE according to the user plane data, and acquiring an RTT value of the UE; when the RTT value meets a preset congestion threshold value, generating a UE speed limit request according to the RTT value and the UE access type, wherein the UE speed limit request comprises speed limit information; and sending the UE speed limit request to a policy control function PCF or a policy and charging control function PCRF through a public interface so that the PCF or the PCRF searches a speed limit rate corresponding to the speed limit information in a preset speed limit information and speed limit rate corresponding relation table, and limits the speed of the UE according to the speed limit rate to complete congestion control of the UE.

To achieve the above object, an embodiment of the present application further provides a congestion control system, including: the receiving module is used for receiving user plane data of User Equipment (UE) and a remote authentication dial-up user service Radius message, wherein the Radius message comprises an access type of the UE; the measurement module is used for carrying out Round Trip Time (RTT) measurement on the UE according to the user plane data and obtaining an RTT value of the UE; the generation module is used for generating a UE speed limit request according to the RTT value and the UE access type when the RTT value meets a preset congestion threshold value, wherein the UE speed limit request comprises speed limit information; and the control module is used for sending the UE speed limit request to a policy control function PCF or a policy and charging control function PCRF through a public interface so that the PCF or the PCRF searches the speed limit rate corresponding to the speed limit information in a preset speed limit information and speed limit rate corresponding relation table, and limits the speed of the UE according to the speed limit rate to complete congestion control of the UE.

To achieve the above object, an embodiment of the present application further provides an electronic device, including: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the congestion control method described above.

To achieve the above object, embodiments of the present application further provide a computer readable storage medium storing a computer program, which when executed by a processor, implements the congestion control method described above.

In the congestion control process of a wireless access network user, receiving user plane data of User Equipment (UE) and a remote authentication dial-up user service Radius message, wherein the Radius message comprises a UE access type; performing Round Trip Time (RTT) measurement on the UE according to the user plane data, and acquiring an RTT value of the UE; when the RTT value meets a preset congestion threshold value, generating a UE speed limit request according to the RTT value and the UE access type, wherein the UE speed limit request comprises speed limit information; and sending the UE speed limit request to a policy control function PCF or a policy and charging control function PCRF through a public interface so that the PCF or the PCRF searches a speed limit rate corresponding to the speed limit information in a preset speed limit information and speed limit rate corresponding relation table, and limits the speed of the UE according to the speed limit rate to complete congestion control of the UE. Because the congestion control method provided by the application does not have a private interface, the application can be implemented in a cross-manufacturer equipment networking environment, and the method has good universality. The technical problem that congestion reporting and control realized by the RCAF or the NWDAF which are not commercially available in the prior art and part of equipment providers through private protocols are not universal and cannot be applied to cross-manufacturer equipment is solved, so that the realization of the congestion reporting and control has certain limitation is solved.

Drawings

FIG. 1 is a schematic structural diagram of an application environment of an embodiment of the present application;

fig. 2 is a flowchart of a congestion control method provided by an embodiment of the present application;

fig. 3 is a flowchart of a congestion control method provided by an embodiment of the present application;

fig. 4 is a flowchart of a congestion control method provided by an embodiment of the present application;

fig. 5 is a schematic structural diagram of a congestion control system provided in an embodiment of the present application;

fig. 6 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the embodiments of the present application will be described in detail below with reference to the accompanying drawings. However, as will be appreciated by those of ordinary skill in the art, in the various embodiments of the present application, numerous technical details have been set forth in order to provide a better understanding of the present application. However, the technical solutions claimed in the present application can be implemented without these technical details and with various changes and modifications based on the following embodiments. The following embodiments are divided for convenience of description, and should not be construed as limiting the specific implementation of the present application, and the embodiments may be mutually combined and referred to without contradiction.

The structure diagram of the application environment of the application is shown in fig. 1, and the application environment comprises a user plane network element, a control plane network element, a policy control network element, user equipment, a wireless access network and a congestion control system, wherein the user plane network element can be a user plane public data gateway (Public Data Network Gate Way, abbreviated as PGW-U) or a user plane function (User Plane Function, abbreviated as UPF) for user plane data forwarding, qoS and policy execution, usage reporting, charging information reporting and other functions; the control plane network element can be a control plane public data gateway PGW-C or session management function (Session Management Function, abbreviated as SMF) for completing session management, UE IP address allocation and management, UPF selection, session policy control, etc.; the policy control network element is PCF/PCRF, which is used for access and mobility policy control, session policy control, and authorizing the resource request (Application Function, AF for short); the congestion control system is the main body of the application, and is used for measuring RTT (round trip time) and packet loss rate of the user plane data TCP message of the UE, judging whether congestion occurs according to the measured value, and sending a request for limiting the speed of the UE to the PCF/PCRF after the congestion occurs.

One embodiment of the present application relates to a congestion control method applied to the congestion control system shown in fig. 1, as shown in fig. 2, including:

step 101, receiving user plane data of user equipment UE and a remote authentication dial-up user service Radius message, wherein the Radius message includes a UE access type.

In an example implementation, the user plane data received by the congestion control system is sent by the user plane network element PGW-U/UPF, where the user plane data is information such as a service in progress by the user equipment, a browsing service, a user requirement, and the like; the remote authentication dial-up user service Radius message received by the congestion control system is sent by a control plane network element, and the Radius message can comprise a UE identifier, a UE access type and UE position information, wherein the UE identifier refers to an IP address of user equipment or other information capable of indicating the identity of the user equipment; the UE access type refers to wireless access information of the UE, and the UE location information may be a tracking area code (Tracking Area Code, abbreviated as TAC) or a location area code (Location Area Code, abbreviated as LAC).

And 102, carrying out Round Trip Time (RTT) measurement on the UE according to the user plane data, and obtaining an RTT value of the UE.

In an example implementation, the present application uses an existing round trip time RTT measurement method to perform round trip time RTT measurement on a user equipment according to user plane data sent by a user plane network element, so as to obtain an RTT value of the user equipment.

And 103, when the RTT value meets a preset congestion threshold value, generating a UE speed limit request according to the RTT value and the UE access type, wherein the UE speed limit request comprises speed limit information.

In an example implementation, a congestion control system stores a table of correspondence between UE access types and congestion thresholds, where different congestion thresholds are present for different access types; after acquiring the RTT value of the UE, the congestion control system firstly acquires a corresponding congestion threshold value from the corresponding relation table based on the UE access type, and then judges whether the RTT value meets a preset congestion threshold value under the current access type.

In an example implementation, a congestion level table divided based on RTT value intervals and UE access types is stored in the congestion control system, that is, the congestion control system may obtain a congestion level of the user equipment according to the size of the RTT value and the current access type of the user equipment; the congestion control system stores a congestion level and access type and speed limit rate corresponding relation table, and the congestion level and access type and speed limit rate corresponding relation table stores the corresponding relation among the UE congestion level, the UE access type and the speed limit rate; the corresponding relation table of the speed limit information and the speed limit rate is preset on the congestion control system, the corresponding relation table of the speed limit information and the speed limit rate stores the corresponding relation between the information combination in the speed limit request and the speed limit rate, and the specific style of the speed limit information in the speed limit request is determined by the adopted specific protocol, such as: the speed limit information in the speed limit request may include an MPS identifier and a session resource reservation priority.

In an example implementation, when the RTT value meets a preset threshold, the congestion control system obtains a UE congestion level of the UE from a congestion level table, and then obtains a UE speed limit rate from a congestion level and access type and speed limit rate correspondence table according to the UE congestion level and the UE access type, so as to obtain an MPS identifier and a session resource reservation priority in the speed limit information from the speed limit information and speed limit rate correspondence table according to the UE congestion rate, and form a UE speed limit request of the user equipment; the method converts the speed limit rate of the user equipment into the form of the MPS identifier and the session resource reservation priority and sends the MPS identifier and the session resource reservation priority to the PCF or the PCRF, so that the congestion control system and the PC F or the PCRF can accurately communicate.

And 104, sending a UE speed limit request to a policy control function PCF or a policy and charging control function PCRF through a public interface so that the PCF or the PCRF searches a speed limit rate corresponding to the speed limit information in a preset speed limit information and speed limit rate corresponding relation table, and limits the speed of the UE according to the speed limit rate to complete congestion control of the UE.

In an example implementation, the common interface may be an Rx interface or an N5 interface, or other 5G standard interfaces, where the congestion control system sends a speed limit request to the policy control function PCF or the policy and charging control function PCRF through the common interface, and after receiving the speed limit request, the policy control function PCF or the policy and charging control function PCRF searches a speed limit rate corresponding to speed limit information in the speed limit request in a speed limit information and speed limit rate correspondence table stored in the policy control function PCF or the policy and charging control function PCRF, and initiates policy update to the control plane network element PGW-C/SMF through other common interfaces (such as a Gx interface or an N7 interface), and meanwhile, carries speed limit rate information in a policy update message; after receiving the speed limit rate, the control plane network element instructs the user plane network element PGW-U/UPF to execute a corresponding speed limit strategy, meanwhile, the user plane network element PGW-U/UPF returns a speed limit response to the control plane network element PGW-C/SMF, and the control plane network element PGW-C/SMF sends the speed limit response to the PCF or PCRF.

In an example implementation, the speed limit request further includes a UE identifier of the UE, so that the policy control function PCF or the policy and charging control function PCRF obtains UE subscription information of the UE according to the UE identifier, and determines authorization of the speed limit request for the UE according to the UE subscription information of the UE; when the authorization passes, the policy control function PCF or policy and charging control function PCRF will issue a message to the control plane network element PGW-C/SMF.

In an example implementation, the speed limit information and speed limit rate correspondence table stored in the congestion control system and the policy control function PCF or the policy and charging control function PCRF should be kept consistent, and the speed limit information and the speed limit rate correspondence table are preconfigured before congestion control is performed, so as to ensure that the speed limit rate at the congestion control system side and the speed limit rate at the policy control function PCF or the policy and charging control function PCRF side are kept consistent.

In the embodiment of the application, in the congestion control process of a wireless access network user, user plane data of User Equipment (UE) and a remote authentication dial-up user service Radius message are received, wherein the Radius message comprises a UE access type; performing Round Trip Time (RTT) measurement on the UE according to the user plane data, and acquiring an RTT value of the UE; when the RTT value meets a preset congestion threshold value, generating a UE speed limit request according to the RTT value and the UE access type, wherein the UE speed limit request comprises speed limit information; and sending the UE speed limit request to a policy control function PCF or a policy and charging control function PCRF through a public interface so that the PCF or the PCRF searches a speed limit rate corresponding to the speed limit information in a preset speed limit information and speed limit rate corresponding relation table, and limits the speed of the UE according to the speed limit rate to complete congestion control of the UE. Because the congestion control method provided by the application does not have a private interface, the application can be implemented in a cross-manufacturer equipment networking environment, and the method has good universality. The technical problem that congestion reporting and control realized by the RCAF or the NWDAF which are not commercially available in the prior art and part of equipment providers through private protocols are not universal and cannot be applied to cross-manufacturer equipment is solved, so that the realization of the congestion reporting and control has certain limitation is solved.

One embodiment of the present application relates to a congestion control method applied to the congestion control system shown in fig. 1, as shown in fig. 3, including:

step 201, receiving user plane data of user equipment UE and a remote authentication dial-up user service Radius message, wherein the Radius message includes a UE identifier and a UE access type.

In an example implementation, the step is substantially the same as step 101 in the embodiment of the present application, and is not described here in detail.

Step 202, performing round trip time RTT measurement on the UE according to the user plane data, and obtaining an RTT value of the UE.

In an example implementation, the step is substantially the same as step 102 in the embodiment of the present application, and is not described here in detail.

Step 203, acquiring the historical RTT value of the UE from the preset RTT information table according to the UE identifier and the UE access type.

In an example implementation, an RTT information table is stored in the congestion control system, where a historical RTT value of the UE of the user equipment under each UE access type is stored in the RTT information table, after receiving the Radius message, all the historical RTT values corresponding to the UE may be searched according to the UE identifier in the Radius message, and the historical RTT value corresponding to the UE access type may be screened out from all the historical RTT values corresponding to the UE identifier.

Step 204, when the historical RTT value is obtained, updating the RTT value according to the value of the product of the second weighting coefficient and the historical RTT value accumulated on the basis of the product of the first weighting coefficient and the RTT value.

In an example implementation, when the historical RTT value is obtained from the RTT information table, the RTT value needs to be updated according to a formula of updating the RTT value=the first weighting coefficient×rtt value+the second weighting coefficient×the historical RTT value, where the first weighting coefficient and the second weighting coefficient are values that are empirically set by a manager.

In an example implementation, when the historical RTT value is obtained from the RTT information table, the historical RTT value in the RTT information table needs to be replaced with an updated RTT value.

Step 205, when the historical RTT value is not obtained, updating the RTT value according to the product of the third weighting coefficient and the RTT value.

In an example implementation, when the historical RTT value is not obtained from the RTT information table, the updated RTT value needs to be obtained according to a formula of updating the RTT value=a third weighting coefficient, where the third weighting coefficient is also a numerical value that is set by the administrator according to experience.

In an example implementation, when the historical RTT value is not obtained from the RTT information table, the updated RTT value and the UE access type need to be saved to the RTT information table according to the UE identity.

And 206, when the updated RTT value meets a preset congestion threshold value, generating a UE speed limit request according to the updated RTT value and the UE access type, wherein the UE speed limit request comprises speed limit information.

In an example implementation, the step is substantially the same as step 103 in the embodiment of the present application, and is not described here in detail.

In an example implementation, when the updated RTT value does not meet the congestion threshold, the historical RTT value in the RTT information table is deleted, and a speed-release request is sent to the policy control function PCF or the policy and charging control function PCRF, so that the policy control function PCF or the policy and charging control function PCRF can release the speed limit for the UE according to the speed-release request.

Step 207, the UE speed limit request is sent to the policy control function PCF or the policy and charging control function PCRF through the public interface, so that the PCF or the PCRF searches the speed limit rate corresponding to the speed limit information in the preset corresponding relation table of the speed limit information and the speed limit rate, and limits the speed of the UE according to the speed limit rate, thereby completing congestion control of the UE.

In an example implementation, the step is substantially the same as step 104 in the embodiment of the present application, and is not described here in detail.

According to the embodiment of the application, after the current RTT value of the user equipment is obtained on the basis of other embodiments, the current RTT value can be corrected by combining the historical RTT value of the user equipment, so that the application does not just take the current RTT value as the congestion judgment basis of the user equipment, but combines the historical congestion condition of the user equipment to judge the current congestion condition of the user equipment, and the accuracy of congestion judgment of the application on the user equipment can be improved.

One embodiment of the present application relates to a congestion control method applied to the congestion control system shown in fig. 1, as shown in fig. 4, including:

step 301, receiving user plane data of a user equipment UE and a remote authentication dial-up user service Radius message, wherein the Radius message contains a UE access type and UE location information.

Step 302, when the UE location information belongs to a preset control range, performing round trip time RTT measurement on the UE according to the user plane data, and obtaining an RTT value of the UE.

In an example implementation, when the location information of the ue is within a preset congestion control range, the round trip time RTT measurement is performed on the ue, and an RTT value of the ue is obtained.

Step 303, when the UE location information does not belong to the preset control range, waiting for the UE to report the Radius message again.

In an example implementation, when the location information of the ue does not fall within a preset congestion control range, it is indicated that the congestion control system is not capable of performing congestion control on the ue, and only is capable of waiting for the ue to upload the Radius message again, to check whether the location information obtained by the ue changes and falls within the preset congestion control range.

And step 304, when the RTT value meets a preset congestion threshold value, generating a UE speed limit request according to the RTT value and the UE access type, wherein the UE speed limit request contains speed limit information.

Step 305, sending the UE speed limit request to the policy control function PCF or the policy and charging control function PCRF through the public interface, so that the PCF or the PCRF searches the speed limit rate corresponding to the speed limit information in the preset corresponding relation table of the speed limit information and the speed limit rate, and limits the speed of the UE according to the speed limit rate, thereby completing congestion control of the UE.

According to the embodiment of the application, the position information of the user equipment can be limited on the basis of other embodiments, so that the application can control the congestion of the user equipment in the appointed range, the practicability of the application is improved, and the privacy protection of the equipment outside the appointed range is improved.

The above steps of the methods are divided, for clarity of description, and may be combined into one step or split into multiple steps when implemented, so long as they include the same logic relationship, and they are all within the protection scope of this patent; it is within the scope of this patent to add insignificant modifications to the algorithm or flow or introduce insignificant designs, but not to alter the core design of its algorithm and flow.

Another embodiment of the present application relates to a congestion control system, and the following details of the congestion control system of the present embodiment are provided only for easy understanding, and are not necessary for implementing the present embodiment, and fig. 5 is a schematic diagram of the congestion control system of the present embodiment, including: a receiving module 401, a measuring module 402, a generating module 403 and a control module 404.

The receiving module 401 is configured to receive user plane data of a user equipment UE and a remote authentication dial-up user service Radius message, where the Radius message includes a UE identifier, a UE access type, and UE location information.

And the measurement module 402 is configured to perform round trip time RTT measurement on the UE according to the user plane data, and obtain an RTT value of the UE.

And a generating module 403, configured to generate a UE speed limit request according to the RTT value and the UE access type when the RTT value meets a preset congestion threshold, where the UE speed limit request includes speed limit information.

And the control module 404 is configured to send a UE speed limit request to a policy control function PCF or a policy and charging control function PCRF through a public interface, so that the PCF or PCRF searches a speed limit rate corresponding to the speed limit information in a preset speed limit information and speed limit rate correspondence table, and speed limits the UE according to the speed limit rate, thereby completing congestion control of the UE.

It is to be noted that this embodiment is a system embodiment corresponding to the above-described method embodiment, and this embodiment may be implemented in cooperation with the above-described method embodiment. The related technical details and technical effects mentioned in the above embodiments are still valid in this embodiment, and in order to reduce repetition, they are not described here again. Accordingly, the related technical details mentioned in the present embodiment can also be applied to the above-described embodiments.

It should be noted that, each module involved in this embodiment is a logic module, and in practical application, one logic unit may be one physical unit, or may be a part of one physical unit, or may be implemented by a combination of multiple physical units. In addition, in order to highlight the innovative part of the present application, elements that are not so close to solving the technical problem presented in the present application are not introduced in the present embodiment, but it does not indicate that other elements are not present in the present embodiment.

Another embodiment of the present application relates to an electronic device, as shown in fig. 6, comprising: at least one processor 501; and a memory 502 communicatively coupled to the at least one processor 501; wherein the memory 502 stores instructions executable by the at least one processor 501, the instructions being executable by the at least one processor 501 to enable the at least one processor 501 to perform the congestion control method in the above embodiments.

Where the memory and the processor are connected by a bus, the bus may comprise any number of interconnected buses and bridges, the buses connecting the various circuits of the one or more processors and the memory together. The bus may also connect various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface between the bus and the transceiver. The transceiver may be one element or may be a plurality of elements, such as a plurality of receivers and transmitters, providing a means for communicating with various other apparatus over a transmission medium. The data processed by the processor is transmitted over the wireless medium via the antenna, which further receives the data and transmits the data to the processor.

The processor is responsible for managing the bus and general processing and may also provide various functions including timing, peripheral interfaces, voltage regulation, power management, and other control functions. And memory may be used to store data used by the processor in performing operations.

Another embodiment of the present application relates to a computer-readable storage medium storing a computer program. The computer program implements the above-described method embodiments when executed by a processor.

That is, it will be understood by those skilled in the art that all or part of the steps in implementing the methods of the embodiments described above may be implemented by a program stored in a storage medium, where the program includes several instructions for causing a device (which may be a single-chip microcomputer, a chip or the like) or a processor (processor) to perform all or part of the steps in the methods of the embodiments described herein. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples of implementing the present application and that various changes in form and details may be made therein without departing from the spirit and scope of the present application.

Claims

1. A method of congestion control, the method comprising:

receiving user plane data of User Equipment (UE) and a remote authentication dial-up user service Radius message, wherein the Radius message comprises an access type of the UE;

performing Round Trip Time (RTT) measurement on the UE according to the user plane data, and acquiring an RTT value of the UE;

when the RTT value meets a preset congestion threshold value, generating a UE speed limit request according to the RTT value and the UE access type, wherein the UE speed limit request comprises speed limit information;

and sending the UE speed limit request to a policy control function PCF or a policy and charging control function PCRF through a public interface so that the PCF or the PCRF searches a speed limit rate corresponding to the speed limit information in a preset speed limit information and speed limit rate corresponding relation table, and limits the speed of the UE according to the speed limit rate to complete congestion control of the UE.

2. The congestion control method according to claim 1, wherein the Radius message further comprises a UE identity; and when the RTT value meets a preset congestion threshold, generating a UE speed limit request according to the RTT value and the UE access type, which includes:

acquiring a historical RTT value of the UE from a preset RTT information table according to the UE identification and the UE access type;

when the historical RTT value is obtained, updating the RTT value according to the value of the product of the second weighting coefficient and the historical RTT value accumulated on the basis of the product of the first weighting coefficient and the RTT value;

when the historical RTT value is not acquired, updating the RTT value according to the product of a third weighting coefficient and the RTT value;

and when the RTT value meets a preset congestion threshold, generating a UE speed limit request according to the RTT value and the UE access type, including:

and when the updated RTT value meets the congestion threshold value, generating the UE speed limiting request according to the updated RTT value and the UE access type.

3. The congestion control method according to claim 2, wherein the method further comprises:

when the historical RTT value is obtained, replacing the historical RTT value in the RTT information table with the updated RTT value;

and when the historical RTT value is not acquired, storing the updated RTT value and the UE access type into the RTT information table according to the UE identification.

4. The congestion control method according to claim 2, wherein the method further comprises:

and when the updated RTT value does not meet the congestion threshold value, deleting the historical RTT value in the RTT information table, and sending a speed limit release request to the PCF or the PCRF so that the PCF or the PCRF can release the speed limit of the UE according to the speed limit release request.

5. The congestion control method according to claim 1, wherein the generating a UE speed limit request according to the RTT value and the UE access type includes:

acquiring the UE congestion level of the UE from a preset congestion level table based on RTT value intervals and UE access type division according to the RTT value and the UE access type;

acquiring the UE speed limiting rate of the UE from a preset congestion level and access type and speed limiting rate corresponding relation table according to the UE congestion level and the UE access type;

and acquiring the speed limiting information from the corresponding relation table of the speed limiting information and the speed limiting rate according to the speed limiting rate of the UE, and forming the speed limiting request of the UE.

6. The congestion control method according to claim 1, wherein the Radius message further contains UE location information;

the performing round trip time RTT measurement on the UE according to the user plane data includes:

when the UE position information belongs to a preset control range, carrying out Round Trip Time (RTT) measurement on the UE according to the user plane data;

and when the UE position information does not belong to the preset control range, waiting for the UE to report the Radius message again.

7. The congestion control method according to claim 1, wherein the UE speed limit request further includes a UE identifier of the UE, so that the PCF or the PCRF obtains UE subscription information of the UE according to the UE identifier, and determines authorization of the UE speed limit request according to the UE subscription information.

8. A congestion control system, comprising:

the receiving module is used for receiving user plane data of User Equipment (UE) and a remote authentication dial-up user service Radius message, wherein the Radius message comprises an access type of the UE;

the measurement module is used for carrying out Round Trip Time (RTT) measurement on the UE according to the user plane data and obtaining an RTT value of the UE;

the generation module is used for generating a UE speed limit request according to the RTT value and the UE access type when the RTT value meets a preset congestion threshold value, wherein the UE speed limit request comprises speed limit information;

and the control module is used for sending the UE speed limit request to a policy control function PCF or a policy and charging control function PCRF through a public interface so that the PCF or the PCRF searches the speed limit rate corresponding to the speed limit information in a preset speed limit information and speed limit rate corresponding relation table, and limits the speed of the UE according to the speed limit rate to complete congestion control of the UE.

9. An electronic device, comprising:

at least one processor; the method comprises the steps of,

a memory communicatively coupled to the at least one processor; wherein, the liquid crystal display device comprises a liquid crystal display device,

the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the congestion control method of any of claims 1 to 7.

10. A computer readable storage medium storing a computer program, wherein the computer program when executed by a processor implements the congestion control method of any one of claims 1 to 7.