Communication bandwidth adaptive adjustment method and system of intelligent charging station

Abstract

The invention discloses a communication bandwidth self-adaptive adjustment method and system for an intelligent charging station. The method comprises the following steps: constructing an edge layer, a network layer and an equipment layer based on a soft bus; the edge layer defines priorities for the service data, generates a dynamic bandwidth adjustment strategy and issues the dynamic bandwidth adjustment strategy to the network layer, the dynamic bandwidth adjustment strategy comprises the steps of presetting fixed bandwidths and back-off time of each priority service based on the priorities, and the back-off time is waiting time before terminal equipment of the equipment layer sends the service data to the network layer; and the network layer receives a service data sending request of the equipment layer, and dynamically adjusts bandwidths occupied by services with different priorities according to the bandwidth dynamic adjustment strategy and the service data sending request. Communication resource hierarchical scheduling is realized through a soft bus technology, a fixed bandwidth proportion is preset based on priorities, a dynamic adjustment mechanism is combined, long-term resource occupation of low-priority services is effectively avoided, and channel competition waiting time of high-priority services can be reduced through differential backoff time design.

Description

Technical Field

[0001] The present invention relates to the field of charging station communication technology, and in particular to a method and system for adaptively adjusting the communication bandwidth of an intelligent charging station. Background Art

[0002] With the rapid development of electric vehicle charging infrastructure, the communication requirements for charging piles are increasing. Multiple devices, such as AC charging piles, are often connected to the network through the same repeater, such as a Wi-Fi router or industrial gateway, to enable remote monitoring, data reporting, and business management.

[0003] When multiple devices communicate simultaneously, conflicts arise due to bandwidth sharing, such as the CSMA / CA mechanism of WiFi. This can easily cause devices to wait for the channel to be idle before sending data. As the number of connected devices increases, the average waiting time increases exponentially, and latency increases during business concurrency. Furthermore, when multiple devices send data simultaneously, collisions occur, requiring data packets to be retransmitted, increasing the packet loss rate. In typical scenarios, the packet loss rate can rise from 5% to 20%. Summary of the Invention

[0004] In order to overcome the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a method and system for adaptively adjusting the communication bandwidth of an intelligent charging station.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a method for adaptively adjusting the communication bandwidth of an intelligent charging station, comprising the following steps:

[0006] Build edge layer, network layer and device layer based on soft bus;

[0007] The edge layer defines the priority of the service data, generates a dynamic bandwidth adjustment strategy and sends it to the network layer. The dynamic bandwidth adjustment strategy includes: presetting a fixed bandwidth and backoff time for each priority service based on the priority. The backoff time is the waiting time before the terminal device at the device layer sends service data to the network layer;

[0008] The network layer receives the service data sending request from the device layer, and dynamically adjusts the bandwidth occupied by services of different priorities according to the bandwidth dynamic adjustment strategy and the service data sending request.

[0009] As a further improvement of the present invention, the step of defining the priority of the service data by the edge layer includes:

[0010] High-priority services: including equipment control instructions and fault alarm data;

[0011] Medium priority services: including user authentication, device status, and operating parameter data;

[0012] Low-priority business: including historical data records and non-real-time operation and maintenance data.

[0013] As a further improvement of the present invention: the step of generating a dynamic bandwidth adjustment strategy at the edge layer includes:

[0014] Setting a fixed bandwidth of a first allocation amount reserved for the high priority service;

[0015] Setting a fixed bandwidth of a second allocation amount reserved for the medium priority service;

[0016] Setting a fixed bandwidth for reserving the remaining allocation quota for the low priority service;

[0017] The first allocation amount > the second allocation amount > the remaining allocation amount;

[0018] The backoff time for services of different priorities is set in increasing order of priority.

[0019] As a further improvement of the present invention: the network layer supports WIFI multi-band communication, and the network layer allocates high-priority services to the 5G band, and medium-priority services and low-priority services to the 2.4G band.

[0020] As a further improvement of the present invention, the dynamic bandwidth adjustment strategy further includes: when multiple high-priority services burst, the bandwidth allocation quota thereof is increased proportionally, and the bandwidth allocation quota of low-priority services is correspondingly reduced.

[0021] As a further improvement of the present invention, the specific process of the network layer dynamically adjusting the bandwidth occupied by services of different priorities includes:

[0022] The service data sending request includes an encapsulated data frame, and the data frame includes at least a device identifier and a priority tag;

[0023] Parsing the data frame to obtain device identification and priority information;

[0024] Reserving corresponding fixed bandwidth for services of different priorities based on the bandwidth dynamic adjustment strategy;

[0025] Sort concurrent requests from multiple terminal devices at the same time according to priority, and temporarily store unprocessed requests in the priority queue;

[0026] Schedule data transmission according to priority order. High-priority service data takes up bandwidth first, while low-priority service data waits for idle time to be transmitted.

[0027] If it is detected that multiple terminal devices are sending data for high-priority services at the same time, the bandwidth allocation quota for high-priority services will be increased and the bandwidth allocation quota for low-priority services will be reduced;

[0028] If it is detected that the frequency bands for transmitting services of different priorities are busy, services of different priorities are sent after waiting according to the corresponding backoff time.

[0029] As a further improvement of the present invention, the specific process of the network layer dynamically adjusting the bandwidth occupied by services of different priorities further includes:

[0030] If the transmission frequency band where the low-priority service is located is detected to be busy for more than the set number of times, the transmission of the low-priority service enters a dormant state.

[0031] As a further improvement of the present invention: the execution subject of the edge layer is an edge server;

[0032] The execution subject of the network layer includes at least one of a DC fast charging pile and a V2G pile;

[0033] The terminal equipment of the equipment layer includes at least one of an AC charging pile, a camera, an environmental sensor and a ground lock controller;

[0034] The AC charging pile sends high-priority business data and medium-priority business data, and the camera sends low-priority business data.

[0035] As a further improvement of the present invention: the terminal device encapsulates the service data into a data frame, the data frame is accompanied by a device identification, a data type and a priority tag, and sends a transmission request to the network layer according to the communication protocol.

[0036] The present invention also provides a communication bandwidth adaptive adjustment system for a smart charging station, comprising:

[0037] Edge servers, used to define service priorities and set dynamic bandwidth adjustment policies;

[0038] Repeaters, including DC fast charging piles and V2G piles, are used to receive policies issued by edge servers and perform dynamic bandwidth adjustments;

[0039] Terminal devices, including AC piles, cameras, environmental sensors and ground locks, are used to send business data with priority tags to the repeater.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] The present invention constructs a three-level resource scheduling architecture of edge layer-network layer-device layer through a soft bus, without modifying the device hardware. The edge layer is used to define the priority of service data, generate a dynamic bandwidth adjustment strategy and send it to the network layer. The dynamic bandwidth adjustment strategy presets a fixed bandwidth based on the priority and designs differentiated backoff time, so that bandwidth resources are allocated on demand, which can reduce the channel competition waiting time of high-priority services and reduce the packet loss rate of key services. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 This is a diagram of the communication resource scheduling architecture of the edge gateway-repeater-device of the present invention.

[0043] Figure 2 Schematic diagram of the process of the edge layer function of the present invention. DETAILED DESCRIPTION

[0044] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and corresponding drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0045] In order to solve the technical problems in the prior art, the present invention is further described with reference to the accompanying drawings and embodiments:

[0046] like Figure 2 As shown, the present invention discloses a method for adaptively adjusting the communication bandwidth of a smart charging station, comprising the following steps:

[0047] Build edge layer, network layer and device layer based on soft bus;

[0048] The edge layer defines the priority of the service data, generates a dynamic bandwidth adjustment strategy and sends it to the network layer. The dynamic bandwidth adjustment strategy includes: presetting a fixed bandwidth and backoff time for each priority service based on the priority. The backoff time is the waiting time before the terminal device at the device layer sends service data to the network layer;

[0049] The network layer receives the service data sending request from the device layer, and dynamically adjusts the bandwidth occupied by services of different priorities according to the bandwidth dynamic adjustment strategy and the service data sending request.

[0050] The three-level architecture design of edge layer, network layer and device layer can realize hierarchical management of communication resources. The fixed bandwidth ratio is preset based on priority, which enables high-priority services to obtain bandwidth resources first, ensuring that high-priority services obtain deterministic delay guarantees, and the differentiated backoff time design can reduce the channel competition waiting time of high-priority services, effectively reduce the channel conflict probability when multiple devices are concurrent, reduce the conflict probability of high-priority services, and reduce the packet loss rate of key services.

[0051] The application of soft bus technology supports plug-and-play of equipment from different manufacturers, facilitating the rapid access and resource allocation of new equipment (such as V2G piles and ground locks) when charging stations are expanded, thereby reducing the complexity of operation and maintenance.

[0052] In some implementations, the step of defining the priority of service data at the edge layer includes:

[0053] High-priority service P1: includes equipment control instructions and fault alarm data, requiring real-time performance of less than 50ms;

[0054] Medium priority service P2: includes user authentication, device status, and operating parameter data, with an allowable delay of less than 200ms;

[0055] Low-priority services P3: include historical data records and non-real-time operation and maintenance data, with a delay tolerance of > 1s.

[0056] Specifically, in charging station scenarios, charging control instructions and equipment fault alarms (such as AC pile overtemperature protection signals) are defined as high-priority services, charging status reports (such as remaining power) are defined as medium-priority services, and non-real-time data (such as historical charging records and equipment logs) are defined as low-priority services.

[0057] Example: Charging control command of AC pile 1 > status report of AC pile 2 > video stream of camera.

[0058] Clarify the three-level priority service classification standards to ensure the highest transmission guarantee for high-priority services, such as charging control instructions; and set differentiated latency requirements, namely P1 < 50ms / P2 < 200ms, to meet the communication needs of different priority services in charging stations and provide a standardized basis for subsequent bandwidth allocation strategies.

[0059] In some embodiments, it is characterized in that

[0060] The execution entity of the edge layer is the edge server;

[0061] The execution subject of the network layer includes at least one of a DC fast charging pile and a V2G pile;

[0062] The terminal equipment of the equipment layer includes at least one of an AC charging pile, a camera, an environmental sensor and a ground lock controller;

[0063] The AC charging pile sends high-priority business data and medium-priority business data, and the camera sends low-priority business data.

[0064] In some implementations, the terminal device encapsulates the service data into a data frame, the data frame carries a device identifier, a data type, and a priority tag, and sends a transmission request to the network layer according to the communication protocol.

[0065] In some implementations, the step of generating a dynamic bandwidth adjustment strategy at the edge layer includes:

[0066] Setting a fixed bandwidth of a first allocation amount reserved for the high priority service;

[0067] Setting a fixed bandwidth of a second allocation amount reserved for the medium priority service;

[0068] Setting a fixed bandwidth for reserving the remaining allocation quota for the low priority service;

[0069] The first allocation amount > the second allocation amount > the remaining allocation amount;

[0070] The backoff time for services of different priorities is set in increasing order of priority.

[0071] The first allocation quota, the second allocation quota, and the remaining allocation quota respectively represent proportions of the total bandwidth. For example, the first allocation quota is 40% of the total bandwidth.

[0072] The fixed bandwidth reservation mechanism guarantees basic resources for critical services. The backoff time gradient setting, such as P1 for high-priority services being the shortest and P3 for low-priority services being the longest, shortens the average waiting time for high-priority services, achieves predictable allocation of bandwidth resources, and avoids system shocks caused by resource competition.

[0073] In some implementations, the network layer supports WIFI multi-band communication, and the network layer allocates high-priority services to the 5G band, and medium-priority services and low-priority services to the 2.4G band.

[0074] The 5G band is dedicated to high-priority P1 services, leveraging its high bandwidth and low interference characteristics. The 2.4G band carries medium- and low-priority services, achieving physical layer isolation and improving the reliability of real-time service transmission.

[0075] In some implementations, the dynamic bandwidth adjustment strategy further includes: when multiple high-priority services burst, increasing their bandwidth allocation quotas proportionally, and correspondingly reducing the bandwidth allocation quotas of low-priority services.

[0076] It supports bandwidth preemption when high-priority services burst in (such as simultaneous failure alarms of multiple charging piles), which improves the elasticity of available bandwidth when high-priority services P1 burst in, and significantly reduces the packet loss rate of key services.

[0077] In some implementations, the specific process of the network layer dynamically adjusting the bandwidth occupied by services of different priorities includes:

[0078] The service data sending request includes an encapsulated data frame, and the data frame includes at least a device identifier and a priority tag;

[0079] Parsing the data frame to obtain device identification and priority information;

[0080] Reserving corresponding fixed bandwidth for services of different priorities based on the bandwidth dynamic adjustment strategy;

[0081] Sort concurrent requests from multiple terminal devices at the same time according to priority, and temporarily store unprocessed requests in the priority queue;

[0082] Schedule data transmission according to priority order. High-priority service data takes up bandwidth first, while low-priority service data waits for idle time to be transmitted.

[0083] If it is detected that multiple terminal devices are sending data for high-priority services at the same time, the bandwidth allocation quota for high-priority services will be increased and the bandwidth allocation quota for low-priority services will be reduced;

[0084] If it is detected that the frequency bands for transmitting services of different priorities are busy, services of different priorities are sent after waiting according to the corresponding backoff time.

[0085] In some implementations, the specific process of the network layer dynamically adjusting the bandwidth occupied by services of different priorities further includes:

[0086] If the transmission frequency band where the low-priority service is located is detected to be busy for more than the set number of times, the transmission of the low-priority service enters a dormant state.

[0087] Furthermore, the specific process of the network layer dynamically adjusting the bandwidth occupied by services of different priorities also includes:

[0088] If multiple terminal devices are detected sending data for high-priority services at the same time, the bandwidth allocation quota for high-priority services will be increased and the bandwidth allocation quota for low-priority services will be reduced.

[0089] If it is still detected that the transmission band of the high-priority service is busy, it will wait according to the high-priority backoff time and then send it until all high-priority services are sent;

[0090] If it is detected that the transmission frequency bands of the medium-priority service and the low-priority service are busy, the service is sent after waiting according to the backoff time corresponding to the medium-priority service and the low-priority service.

[0091] Implementation Case 1:

[0092] like Figure 1 As shown, the embodiment of the present invention discloses a communication bandwidth adaptive adjustment system for a smart charging station, which implements "hierarchical scheduling + dynamic slicing" through soft bus technology, including:

[0093] Edge servers, used to define service priorities and set dynamic bandwidth adjustment policies;

[0094] Repeaters, including DC fast charging piles and V2G piles, are used to receive policies issued by edge servers and perform dynamic bandwidth adjustments;

[0095] Terminal devices, including AC piles, cameras, environmental sensors and ground locks, are used to send business data with priority tags to the repeater.

[0096] There is also a cloud management platform connected to the edge layer via 4G / fiber network.

[0097] The edge server defines three levels of service priority through a distributed soft bus; configures a dynamic bandwidth adjustment policy with fixed bandwidth allocation, backoff time, and preemption rules; and monitors network layer load in real time to optimize policy parameters. The edge server establishes a star topology connection with regional repeaters via a fiber optic backbone network. Each regional repeater uses PLC power line communication as the primary communication link and Wi-Fi 5G as a dedicated link for high-priority services. If the primary communication link is interrupted, it automatically switches to a Zigbee 3.0 or BLE Mesh backup link.

[0098] The repeater group receives and executes the bandwidth adjustment policy of the edge server; implements physical isolation of the 5G / 2.4G dual-band; and processes concurrent requests from terminal devices according to priority.

[0099] The terminal device configuration is as follows: AC charging pile: supports both PLC and WiFi 5G dual-mode communication; camera: supports PLC and Zigbee 3.0 communication; environmental sensor: supports BLE Mesh and PLC communication; ground lock controller: supports BLE Mesh and Wi-Fi relay communication.

[0100] Using the distributed soft bus technology of the Dianhong system, a three-level resource scheduling architecture consisting of "edge gateway-repeater-device" is constructed. Smart charging stations are centrally scheduled by edge servers, with DC fast charging stations and V2G charging stations acting as repeaters, and other AC charging stations, cameras, environmental sensors, and ground locks acting as terminal devices.

[0101] Dianhong is an IoT operating system that adapts to the characteristics of the power industry. It is based on open source Hongmeng and open source Euler, and selects the technical capability set that is most suitable for power scenarios. On this basis, it adds a "characteristic application layer" for the power system. Through the Internet of Things communication protocol, a system is implemented to cover different types and brands of power equipment, connecting massive power equipment terminals from different manufacturers for information exchange and communication, realizing rapid adaptation of IoT devices, and integrating data from different devices.

[0102] The specific implementation steps in the charging station scenario are as follows:

[0103] 1. Define three levels of priority through edge servers:

[0104] High-priority services (P1): charging control instructions and equipment fault alarms (such as AC charging pile overtemperature protection signals), requiring real-time performance of less than 50ms;

[0105] Medium priority services (P2): user authentication data, charging status reporting (such as remaining battery power), with an allowable delay of less than 200ms;

[0106] Low-priority services (P3): non-real-time data (such as historical charging records and device logs), with a delay tolerance of > 1 second.

[0107] Example: Charging control command of AC pile 1 (P1) > status report of AC pile 2 (P2) > video stream of camera (P3).

[0108] 2. The edge server sets a dynamic bandwidth adjustment policy, which includes:

[0109] Based on the priority, fixed bandwidth for each priority service is pre-set. For example, the repeater reserves fixed bandwidth (such as 40% of the total bandwidth) for high priority services, 30% for medium priority services, and the remaining 30% is dynamically allocated to low priority services.

[0110] And determine the backoff time according to the priority: the device sending P1 has the shortest backoff time (such as 10ms), and the device sending P3 has the longest backoff time (such as 100ms), reducing the probability of high-priority service conflicts; the backoff time is the waiting time before the terminal device sends service data to the repeater.

[0111] And when high-priority business emerges (such as multiple AC piles reporting faults at the same time), it automatically seizes the bandwidth of low-priority business (such as temporarily interrupting the camera video stream).

[0112] Among them, the repeater supports Wi-Fi multi-band (2.4G+5G), fixes high-priority services in the 5G band (less interference and high bandwidth), and uses the 2.4G band for medium and low priority services to achieve physical isolation.

[0113] 3. The edge server sends the bandwidth dynamic adjustment strategy to the repeater;

[0114] 4. The repeater counts the business data sending requests from the terminal devices in real time. The business data sending requests include business data, device identification, data type (such as real-time monitoring data / non-real-time control instructions) and priority tags.

[0115] The repeater dynamically adjusts the bandwidth occupied by services of different priorities according to the bandwidth dynamic adjustment strategy and service data sending request.

[0116] The specific process of multiple devices sending service data to the repeater is as follows:

[0117] 1) Device data encapsulation and sending request: Each device (such as AC piles, sensors, etc.) encapsulates business data (such as charging status, energy consumption data) into a data frame, accompanied by a device identifier, data type (real-time monitoring data / non-real-time control instructions) and priority tag.

[0118] 2) The device sends a transmission request to the repeater according to the communication protocol (such as CSMA / CA for Wi-Fi and time division multiplexing for PLC) and waits for the repeater to respond.

[0119] The repeater's request reception and preliminary processing are as follows:

[0120] 1) The repeater continuously monitors the request signals of each device and parses the device identification and priority information in the data frame.

[0121] 2) For concurrent requests from multiple devices at the same time, the repeater sorts them by priority (for example: real-time charging control instructions > status monitoring data > historical data upload) and temporarily stores requests that are not immediately processed in the queue.

[0122] 3) Data transmission and conflict handling

[0123] Primary path transmission: High-priority data takes up bandwidth first and is transmitted via the primary communication protocol (such as Wi-Fi and PLC); low-priority data waits for idle time to be transmitted.

[0124] Conflict resolution: If bandwidth competition occurs (such as when a busy channel is detected in WiFi's CSMA / CA mechanism), the repeater reduces conflicts by dynamically adjusting bandwidth.

[0125] Specific workflow example:

[0126] Scenario: A repeater (DC fast charging pile 3) is connected to three AC charging piles (P1 / P2 services) and one camera (P3 service), and sends data simultaneously.

[0127] ① Priority marking and bandwidth allocation:

[0128] AC pile 1 sends a charging control instruction (P1), marked as high priority;

[0129] AC pile 2 reports the charging status (P2), which is marked as medium priority;

[0130] The camera transmits a video stream (P3), marked as low priority;

[0131] ② The repeater reserves 40% bandwidth for P1 (such as 20Mbps in the 5G band), 30% for P2 (15Mbps in the 2.4G band), and initially allocates 30% for P3 (15Mbps in the 2.4G band).

[0132] ③Conflict avoidance and scheduling

[0133] AC charging station 1 (P1): If the 5G band is detected to be idle, data will be sent directly without a long backoff period. If the 5G band is detected to be busy (e.g., multiple AC charging stations are sending high-priority P1 services at the same time), the repeater will increase the P1 bandwidth to 60% (preempting 20% ​​of P3's bandwidth) and temporarily stop the camera video stream transmission to ensure that charging control instructions are not lost. If the 5G band is still detected to be busy, it will wait according to the backoff time (10ms) before sending again until all high-priority services are sent.

[0134] AC pile 2 (P2): detects that the channel is busy in the 2.4G band and sends after waiting for the medium priority backoff time (50ms);

[0135] Camera (P3): When the channel is detected to be busy, it waits according to the low-priority backoff time (100ms). If there are multiple conflicts, it goes into sleep mode to release bandwidth for high-priority services.

[0136] The main functions of the present invention are:

[0137] 1. Hierarchical resource optimization: Through the three-level architecture design of edge layer, network layer, and device layer, hierarchical management of communication resources is achieved, so that high-priority services can obtain bandwidth resources first, ensuring the real-time requirements of critical services. Bandwidth resources are allocated on demand, avoiding the phenomenon of "low-priority services preempting high-priority channels."

[0138] 2. Dynamic bandwidth guarantee: A fixed bandwidth ratio is preset based on priority, and combined with a dynamic adjustment mechanism, it effectively prevents low-priority services from occupying resources for a long time. At the same time, it supports bandwidth preemption when high-priority services burst, significantly reducing the packet loss rate of critical services.

[0139] 3. Reduced conflict probability: Differentiated backoff time design can reduce the channel competition waiting time of high-priority services, thereby reducing the conflict probability of high-priority services. At the same time, the queue temporary storage mechanism is used to ensure the final transmission of medium and low-priority services.

[0140] 4. Compatibility: No need to modify the device hardware, it can be achieved through the upgrade of the soft bus protocol stack, adapting to the mixed scenarios of new and old devices.

[0141] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0142] The foregoing description is intended only to provide specific embodiments of the present invention, intended to enable those skilled in the art to understand and implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not intended to be limited to the embodiments shown herein, but is intended to be accorded the widest scope consistent with the principles and novel features claimed herein.

[0143] In summary, after reading the present invention document, ordinary technicians in this field can make various other corresponding transformation schemes based on the technical solutions and technical concepts of the present invention without creative mental work, and all of them fall within the scope of protection of the present invention.

Claims

1. A method for adaptively adjusting the communication bandwidth of a smart charging station, characterized in that: The following steps are involved: Build edge layer, network layer and device layer based on soft bus; The edge layer defines the priority of the service data, generates a dynamic bandwidth adjustment strategy and sends it to the network layer. The dynamic bandwidth adjustment strategy includes: presetting a fixed bandwidth and backoff time for each priority service based on the priority. The backoff time is the waiting time before the terminal device at the device layer sends service data to the network layer; The network layer receives the service data sending request from the device layer, and dynamically adjusts the bandwidth occupied by services of different priorities according to the bandwidth dynamic adjustment strategy and the service data sending request.

2. The method for adaptively adjusting the communication bandwidth of a smart charging station according to claim 1, characterized in that: The step of defining the priority of the service data by the edge layer includes: High-priority services: including equipment control instructions and fault alarm data; Medium priority services: including user authentication, device status, and operating parameter data; Low-priority business: including historical data records and non-real-time operation and maintenance data.

3. The method for adaptively adjusting the communication bandwidth of a smart charging station according to claim 2, characterized in that: The step of generating a dynamic bandwidth adjustment strategy at the edge layer includes: Setting a fixed bandwidth of a first allocation amount reserved for the high priority service; Setting a fixed bandwidth of a second allocation amount reserved for the medium priority service; Setting a fixed bandwidth for reserving the remaining allocation quota for the low priority service; The first allocation amount > the second allocation amount > the remaining allocation amount; The backoff time for services of different priorities is set in increasing order of priority.

4. The method for adaptively adjusting the communication bandwidth of a smart charging station according to claim 3, characterized in that: The network layer supports WIFI multi-band communication, and the network layer allocates high-priority services to the 5G band, and medium-priority services and low-priority services to the 2.4G band.

5. The method for adaptively adjusting the communication bandwidth of a smart charging station according to claim 3, characterized in that: The dynamic bandwidth adjustment strategy also includes: when multiple high-priority services burst, their bandwidth allocation quotas are increased proportionally, and the bandwidth allocation quotas of low-priority services are reduced accordingly.

6. The method for adaptively adjusting the communication bandwidth of a smart charging station according to any one of claims 1 to 5, characterized in that: The specific process of the network layer dynamically adjusting the bandwidth occupied by services of different priorities includes: The service data sending request includes an encapsulated data frame, and the data frame includes at least a device identifier and a priority tag; Parsing the data frame to obtain device identification and priority information; Reserving corresponding fixed bandwidth for services of different priorities based on the bandwidth dynamic adjustment strategy; Sort concurrent requests from multiple terminal devices at the same time according to priority, and temporarily store unprocessed requests in the priority queue; Schedule data transmission according to priority order. High-priority service data takes up bandwidth first, while low-priority service data waits for idle time to be transmitted. If it is detected that multiple terminal devices are sending data for high-priority services at the same time, the bandwidth allocation quota for high-priority services will be increased and the bandwidth allocation quota for low-priority services will be reduced; If it is detected that the frequency bands for transmitting services of different priorities are busy, services of different priorities are sent after waiting according to the corresponding backoff time.

7. The method for adaptively adjusting the communication bandwidth of a smart charging station according to claim 6, characterized in that: The specific process of the network layer dynamically adjusting the bandwidth occupied by services of different priorities also includes: If the transmission frequency band where the low-priority service is located is detected to be busy for more than the set number of times, the transmission of the low-priority service enters a dormant state.

8. The method for adaptively adjusting the communication bandwidth of a smart charging station according to claim 7, characterized in that: The execution entity of the edge layer is the edge server; The execution subject of the network layer includes at least one of a DC fast charging pile and a V2G pile; The terminal equipment of the equipment layer includes at least one of an AC charging pile, a camera, an environmental sensor and a ground lock controller; The AC charging pile sends high-priority business data and medium-priority business data, and the camera sends low-priority business data.

9. The method for adaptively adjusting communication bandwidth of a smart charging station according to claim 8, characterized in that: The terminal device encapsulates the service data into a data frame, which is accompanied by a device identifier, a data type and a priority tag, and sends a transmission request to the network layer according to the communication protocol.

10. A communication bandwidth adaptive adjustment system for a smart charging station, characterized in that: include: Edge servers, used to define service priorities and set dynamic bandwidth adjustment policies; Repeaters, including DC fast charging piles and V2G piles, are used to receive policies issued by edge servers and perform dynamic bandwidth adjustments; Terminal devices, including AC piles, cameras, environmental sensors and ground locks, are used to send business data with priority tags to the repeater.

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