A traffic monitoring and regulation system for a SIM card sharing traffic pool

By designing a SIM card shared traffic pool traffic monitoring and control system, real-time monitoring and dynamically regulating traffic usage, the management problem of shared traffic pools in IoT devices is solved, and efficient use of traffic and stable operation of equipment is achieved.

CN119277436BActive Publication Date: 2025-07-11GUANGDONG JUCHEN JINLI COMM EQUIP TECH CO LTD
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Patent Information

Application Number
CN202411379434.7
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-09-30
Publication Date
2025-07-11
Estimated Expiration
2044-09-30

AI Technical Summary

Technical Problem

In IoT devices, the traffic management of shared traffic pools has problems such as traffic exceeding the limit, complex traffic allocation, operator system upgrade risk and low utilization rate, which affects the normal operation of equipment and waste of resources.

Method used

A SIM card shared traffic pool traffic monitoring and control system is designed, including a traffic monitoring module, a data analysis module, a status evaluation module and a strategy control module. By monitoring, analyzing and evaluating traffic usage in real time, the number of backup SIM cards is dynamically controlled, and the traffic allocation and utilization rate are optimized.

Benefits of technology

Reduce the risk of traffic exceeding limits, improve the adaptability of operator system upgrades, improve traffic utilization, ensure normal operation of equipment and system stability, and achieve scientific decision-making support.

✦ Generated by Eureka AI based on patent content.

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Abstract

The present invention relates to the technical field of traffic management, and discloses a traffic monitoring and regulation system for sharing a traffic pool of SIM cards. After obtaining the total usage of the traffic pool through the traffic monitoring module, the present invention updates and saves it to the shared traffic pool usage database, then compares the total usage of the traffic pool with the set usage standard, and evaluates the status of the traffic pool according to the analysis result. Finally, according to the evaluation result, the policy regulation module enables the number of standby SIM cards to ensure that the remaining traffic in the traffic pool is sufficient to cope with emergencies. At the same time, the present invention adjusts the traffic usage standard according to the date of each month to avoid the situation that the remaining traffic in the traffic pool may not be fully utilized before expiration, resulting in waste of resources. Moreover, considering that no operations can be performed on the SIM card during the system upgrade and maintenance window time of the operator, which will affect the real-time status management of the SIM card, the traffic usage standard is adjusted according to the maintenance time of the operator.
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Description

Technical Field

[0001] The present invention relates to the technical field of traffic management, and specifically relates to a traffic monitoring and regulation system for a SIM card shared traffic pool. Background Art

[0002] In recent years, the rapid development of the Internet of Things has enabled a large number of devices to connect to the network through SIM cards. To save data traffic, most Internet of Things devices access the data network by sharing a traffic pool. However, during the operation of the shared traffic pool, various problems and risks may be faced.

[0003] Firstly, the risk of traffic overrun is a significant challenge. Once the usage of the shared traffic pool exceeds the total capacity, the data services of all participating SIM cards will be shut down, which causes the devices to malfunction and affects business operations. Secondly, traffic management becomes complex. When sharing traffic among multiple devices, abnormal usage devices may cause the entire traffic pool to be shut down due to overage in a short period of time. How to reasonably allocate and monitor traffic usage will become a daunting task. In addition, the risk of operator system upgrade may also affect the management of the traffic pool. During the operator system upgrade and maintenance window period, no operations can be performed on the SIM cards, which will affect the real-time status management of the SIM cards. Finally, the low utilization rate of the shared traffic pool is also a potential problem. The remaining traffic in the traffic pool fails to be fully utilized before expiration, resulting in waste of resources. Therefore, a reasonable traffic management and monitoring mechanism is particularly important. The present invention proposes a traffic monitoring and regulation system for a SIM card shared traffic pool to ensure the efficient operation of the shared traffic pool. Summary of the Invention

[0004] The purpose of the present invention is to provide a traffic monitoring and regulation system for a SIM card shared traffic pool to solve the above technical problems.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A traffic monitoring and regulation system for a SIM card shared traffic pool, the system includes a traffic monitoring module, a data analysis module, a status evaluation module and a policy regulation module;

[0007] The traffic monitoring module is used to monitor the SIM card shared traffic pool, calculate the traffic consumption data of the shared traffic pool in near real-time, and update and save it to the shared traffic pool usage database;

[0008] The data analysis module is used to analyze the data monitored by the traffic monitoring module;

[0009] The status evaluation module is used to evaluate the current status of the traffic pool according to the analysis results of the data analysis module;

[0010] The policy control module is used to control the number of standby SIM cards activated in the traffic pool according to the current state of the traffic pool.

[0011] As a further description of the solution of the present invention, the working process of the traffic monitoring module includes:

[0012] Regularly obtain the quasi-real-time usage of each SIM card every 300 seconds, and calculate the total usage p of the traffic pool through the formula p f = f1 + f2 + … + f i + … + f n Aggregate and calculate to obtain the total usage p of the traffic pool f ;

[0013] where n is the number of SIM cards activated in the traffic pool, and f i is the real-time usage of the i-th SIM card, and i belongs to n.

[0014] As a further description of the solution of the present invention, the working process of the data analysis module includes:

[0015] Divide the traffic usage requirements of the shared traffic pool into stages according to the monthly date;

[0016] According to the data of the traffic usage of the i-th SIM card changing with time, obtain the function f i (t) of the traffic usage of the i-th SIM card changing with time in each stage;

[0017] Substitute the function f i (t) of the traffic usage of the i-th SIM card changing with time in each stage into the formula Calculate to obtain the function p f (t) of the traffic usage of the traffic pool changing with time;

[0018] According to the function f i (t) of the traffic usage of the i-th SIM card changing with time in each stage, construct a calculation model for the traffic usage risk coefficient of the traffic pool, and the expression is:

[0019]

[0020] In the formula, m is the current stage, p fj (t) is the function of the actual traffic usage of the traffic pool changing with time in the j-th stage, p fj0 (t) is the function of the standard traffic usage of the traffic pool changing with time set in the j-th stage, α j is the weight coefficient corresponding to the j-th stage, where j belongs to m, ΔSP T is the set state reference value, and ρ is the real-time traffic usage risk coefficient of the traffic pool.

[0021] As a further description of the solution of the present invention, the working process of dividing the traffic usage requirements of the shared traffic pool according to the monthly date into stages includes:

[0022] The 1st day of each month to the 6th day from the end of the month is divided into the first stage, the 5th day from the end of the month is divided into the second stage, the 4th day from the end of the month is divided into the third stage, the 3rd day from the end of the month is divided into the fourth stage, the 2nd day from the end of the month is divided into the fifth stage, and the 1st day from the end of the month is divided into the sixth stage;

[0023] According to different stages, the traffic usage of the traffic pool set in each stage increases in turn.

[0024] As a further description of the solution of the present invention, the working process of the state evaluation module includes:

[0025] Compare the total traffic usage of the traffic pool in the current stage with the set standard usage range;

[0026] If the total traffic usage of the traffic pool is less than or within the set standard usage range, it means that the traffic usage is normal;

[0027] If the total traffic usage of the traffic pool is greater than the set standard usage range, it means that there is a risk in traffic usage.

[0028] As a further description of the solution of the present invention, the working process of the policy regulation module includes:

[0029] When the total traffic usage of the traffic pool is less than the set standard usage range, do not activate the standby SIM card;

[0030] When the total traffic usage of the traffic pool is within the set standard usage range, activate x standby SIM cards to cope with emergencies;

[0031] When the total traffic usage of the traffic pool is greater than the set standard usage range, activate y standby SIM cards to cope with emergencies.

[0032] As a further description of the solution of the present invention, the process of obtaining the number of standby SIM cards includes:

[0033] When the total traffic usage of the traffic pool is less than the set standard usage range, x = total number of activated SIM cards * 3%;

[0034] When the total traffic usage of the traffic pool is greater than the set standard usage range, calculate the current traffic usage risk coefficient ρ of the traffic pool;

[0035] Calculate y through the following formula:

[0036] y = x + (ρ - ρ0) * δ;

[0037] Where ρ0 is the preset threshold of the risk coefficient for the usage of the real-time traffic pool, and δ is the conversion coefficient.

[0038] As a further description of the solution of the present invention, the traffic volume of the traffic pool is adjusted according to the maintenance time of the operator, and the adjustment method is as follows:

[0039] Obtain the maintenance time of the operator in real time. When the maintenance time of the operator is from the 1st day to the 6th day before the end of the month, the set traffic volume of the traffic pool remains unchanged, that is, the initial set usage;

[0040] When the maintenance time of the operator is from the 5th day before the end of the month to the last day of the month, and the maintenance time is less than 8 hours, the set traffic volume of the traffic pool remains unchanged, the initial set usage;

[0041] When the maintenance time of the operator is from the 5th day before the end of the month to the last day of the month, and 16 hours > the maintenance time ≥ 8 hours, the usage ratio on the day before the system maintenance date is reduced by 1 percentage point;

[0042] When the maintenance time of the operator is from the 5th day before the end of the month to the last day of the month, and 24 hours > the maintenance time ≥ 16 hours, the usage ratio on the day before the system maintenance date is reduced by 2 percentage points;

[0043] When the maintenance time of the operator is from the 5th day before the end of the month to the last day of the month, and the maintenance time ≥ 24 hours, the usage ratio on the day before the system maintenance date is reduced by 3 percentage points.

[0044] The beneficial effects of the present invention:

[0045] 1. Reduce the risk of traffic overrun: By real-time monitoring the usage of the traffic pool, ensure that the remaining capacity of the traffic pool always remains within a safe range, effectively avoiding the shutdown of the SIM card data service caused by traffic overrun, thus ensuring the normal operation of the device;

[0046] 2. Improve the adaptability to the operator system upgrade: By real-time synchronizing the maintenance time window of the operator system, the control strategy can be dynamically adjusted according to the maintenance time, ensuring that the management of the traffic pool is not affected during the system upgrade period, and improving the real-time status management ability of the SIM card.

[0047] 3. Improve the traffic utilization rate: Through the dynamic control of the traffic pool, ensure that the remaining traffic in the traffic pool can be fully utilized before expiration, reduce resource waste, and thus maximize the usage efficiency of the traffic;

[0048] 4. Enhance the stability and reliability of the system: Regular usage monitoring and adjustment strategy updates ensure the healthy and stable operation of the traffic pool under different usage scenarios. Through scientific adjustment logic, it can effectively respond to emergencies and improve the overall reliability of the system;

[0049] 5. Real-time data-driven decision-making: By obtaining quasi-real-time data, it provides reliable data support for the adjustment of the traffic pool, making the decision-making process more scientific and efficient. Real-time data updates and analysis can help managers make timely adjustments and optimize traffic usage. Brief Description of the Drawings

[0050] The present invention will be further described below with reference to the accompanying drawings.

[0051] Figure 1 It is a partial usage process schematic diagram of the SIM card shared traffic pool traffic monitoring and adjustment system provided by the present invention. Detailed Embodiments

[0052] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0053] Please refer to Figure 1 , the present invention is a SIM card shared traffic pool traffic monitoring and adjustment system, and the system includes a traffic monitoring module, a data analysis module, a status evaluation module, and a strategy adjustment module;

[0054] The traffic monitoring module is used to monitor the SIM card shared traffic pool, calculate the traffic consumption data of the shared traffic pool in real time, and update and save it to the shared traffic pool usage database;

[0055] The data analysis module is used to analyze the data monitored by the traffic monitoring module;

[0056] The status evaluation module is used to evaluate the current status of the traffic pool according to the analysis results of the data analysis module;

[0057] The strategy adjustment module is used to adjust the number of standby SIM cards activated in the traffic pool according to the current status of the traffic pool.

[0058] Through the above technical solution, the present invention monitors the real-time usage of all SIM cards in the shared traffic pool in real time through the traffic monitoring module. After calculating and summarizing to obtain the total traffic pool usage, it is updated and saved to the shared traffic pool usage database, which serves as an important data source for the update of the subsequent shared traffic pool regulation strategy and the execution of the shared traffic pool regulation task. Then, by comparing the total traffic pool usage with the set usage standard and evaluating the traffic pool status based on the analysis results. Finally, according to the evaluation results, the policy regulation module enables the number of standby SIM cards to ensure that the remaining traffic in the traffic pool is sufficient to cope with emergencies. At the same time, the present invention adjusts the traffic usage standard according to the date of each month to avoid the possible waste of resources caused by the insufficient utilization of the remaining traffic in the traffic pool before expiration. Moreover, considering that no operations can be performed on the SIM cards during the operator system upgrade and maintenance window time, which will affect the real-time status management of the SIM cards, the traffic usage standard is adjusted according to the operator's maintenance time.

[0059] As a further description of the solution of the present invention, the working process of the traffic monitoring module includes:

[0060] Regularly obtain the quasi-real-time usage of each SIM card every 300 seconds. Through the formula p f = f1 + f2 + … + f i + … + f n Summarize and calculate to obtain the total traffic pool usage p f ;

[0061] Where n is the number of SIM cards activated in the traffic pool, and f i is the real-time usage of the i-th SIM card, and i belongs to n.

[0062] Through the above technical solution, in this embodiment, the quasi-real-time usage of SIM cards is regularly obtained from the network operator every 300 seconds through the API. After the usage of each SIM card is calculated and summarized to obtain the total traffic pool usage, it is updated and saved to the shared traffic pool usage database, which serves as an important data source for the update of the subsequent shared traffic pool regulation strategy and the execution of the shared traffic pool regulation task.

[0063] As a further description of the solution of the present invention, the working process of the data analysis module includes:

[0064] Divide the traffic usage requirements of the shared traffic pool into stages according to the date of each month;

[0065] According to the data of the traffic usage of the i-th SIM card changing with time, obtain the function f i (t) of the traffic usage of the i-th SIM card changing with time in each stage;

[0066] The function f iSubstitute (t) into the formula Calculate the flow pool flow usage over time function p f (t);

[0067] According to the function f of the traffic usage of the i-th SIM card changing with time in each stage i (t) Construct a flow pool traffic usage risk coefficient calculation model, the expression is:

[0068]

[0069] In the formula, m is the current stage, p is fj (t) is the function of the actual flow usage of the flow pool in the jth stage over time, p fj0 (t) is the function of the standard flow rate of the flow pool in the jth stage changing with time, α j is the weight coefficient corresponding to the jth stage, where j belongs to m, ΔSP T is the set state reference value, and ρ is the traffic usage risk coefficient of the real-time traffic pool.

[0070] As a further description of the solution of the present invention, the work process of dividing the shared traffic pool traffic usage requirements into stages according to the monthly date includes:

[0071] The first day of each month to the sixth day before the end of the month is divided into the first stage, the fifth day before the end of the month is divided into the second stage, the fourth day before the end of the month is divided into the third stage, the third day before the end of the month is divided into the fourth stage, the second day before the end of the month is divided into the fifth stage, and the first day before the end of the month is divided into the sixth stage;

[0072] Depending on the stage, the flow usage of the flow pool set for each stage increases successively.

[0073] As a further description of the solution of the present invention, the working process of the state assessment module includes:

[0074] Compare the total traffic usage of the traffic pool at the current stage with the set standard usage range;

[0075] If the total traffic usage of the traffic pool is less than or within the set standard usage range, it means that the traffic usage is normal;

[0076] If the total traffic usage of the traffic pool is greater than the set standard usage range, it means that there is a risk in traffic usage.

[0077] As a further description of the solution of the present invention, the working process of the policy control module includes:

[0078] When the total traffic usage of the traffic pool is less than the set standard usage range, there is no need to activate the backup SIM card;

[0079] When the total usage of the traffic pool traffic belongs to the set standard usage range, activate x spare SIM cards to cope with emergencies;

[0080] When the total usage of the traffic pool traffic is greater than the set standard usage range, activate y spare SIM cards to cope with emergencies.

[0081] As a further description of the solution of the present invention, the process of obtaining the number of spare SIM cards includes:

[0082] When the total usage of the traffic pool traffic is less than the set standard usage range, x = the total number of activated SIM cards * 3%;

[0083] When the total usage of the traffic pool traffic is greater than the set standard usage range, calculate the current traffic usage risk coefficient ρ of the traffic pool;

[0084] Calculate y through the following formula:

[0085] y = x + (ρ - ρ0) * δ;

[0086] In the formula, ρ0 is the preset real-time traffic usage risk coefficient threshold of the traffic pool, and δ is the conversion coefficient.

[0087] Through the above technical solution, in this embodiment, the 1st day of each month to the 6th day from the end of the month is first divided into the first stage, the 5th day from the end of the month is divided into the second stage, the 4th day from the end of the month is divided into the third stage, the 3rd day from the end of the month is divided into the fourth stage, the 2nd day from the end of the month is divided into the fifth stage, and the 1st day from the end of the month is divided into the sixth stage. Then, the traffic usage standards for each stage are divided, and the data of the total traffic usage of the traffic pool changing with time under each stage are obtained. Compare the total traffic usage of the traffic pool in the current stage with the set standard usage range. If the total traffic usage of the traffic pool is less than the set standard usage range, do not activate the spare SIM cards. If the total traffic usage of the traffic pool belongs to the set standard usage range, activate x spare SIM cards. If the total traffic usage of the traffic pool is greater than the set standard usage range, activate y spare SIM cards to ensure that there is enough remaining traffic in the traffic pool to cope with emergencies.

[0088] As a further description of the solution of the present invention, the traffic usage of the traffic pool is adjusted according to the operator's maintenance time, and the adjustment method is:

[0089] Obtain the operator's maintenance time in real time. When the operator's maintenance time is from the 1st day of each month to the 6th day from the end of the month, the set traffic usage of the traffic pool remains unchanged, that is, the initial set usage;

[0090] When the operator's maintenance time is from the 5th day before the end of the month to the last day of the month, and the maintenance time is less than 8 hours, the set flow pool flow usage remains unchanged, the initial set usage;

[0091] When the operator's maintenance time is from the 5th day before the end of the month to the last day of the month, and 16 hours > maintenance time ≥ 8 hours, the usage ratio on the day before the system maintenance date is reduced by 1 percentage point;

[0092] When the operator's maintenance time is from the 5th day before the end of the month to the last day of the month, and 24 hours > maintenance time ≥ 16 hours, the usage ratio on the day before the system maintenance date is reduced by 2 percentage points;

[0093] When the operator's maintenance time is from the 5th day before the end of the month to the last day of the month, and maintenance time ≥ 24 hours, the usage ratio on the day before the system maintenance date is reduced by 3 percentage points.

[0094] Through the above technical solution, this embodiment combines the system maintenance time to adjust the set flow usage standard. By querying empirical data and combining the system maintenance characteristics of the three major operators, the system maintenance duration is divided into three states: 8 hours, 16 hours, and 24 hours. According to the date of system maintenance, the flow usage standard is adjusted in real time to avoid being unable to perform any operations on the SIM card during the system upgrade and maintenance window time of the operator, which affects the real-time status management of the SIM card.

[0095] It should be noted that all the weight coefficients, thresholds, standards, and standard intervals in the present invention are obtained based on empirical data and do not need to be described in detail.

[0096] The above has described a detailed description of an embodiment of the present invention, but the content described is only the preferred embodiment of the present invention and cannot be considered as limiting the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of the present invention application should still fall within the scope covered by the patent of the present invention.

Claims

1. A traffic monitoring and regulation system for a SIM card sharing traffic pool, characterized in that, The system includes a traffic monitoring module, a data analysis module, a status evaluation module, and a policy regulation module; The traffic monitoring module is used to monitor the SIM card shared traffic pool, calculate the traffic consumption data of the shared traffic pool in near real-time, and update and save it to the shared traffic pool usage database; The data analysis module is used to analyze the data monitored by the traffic monitoring module; The status evaluation module is used to evaluate the current status of the traffic pool according to the analysis results of the data analysis module; The policy regulation module is used to regulate the number of standby SIM cards activated in the traffic pool according to the current status of the traffic pool; The working process of the traffic monitoring module includes: Regularly obtain the quasi-real-time usage of each SIM card every 300 seconds, and through the formula p f = f1 + f2 + … + f i + … + f n Summarize and calculate to obtain the total usage p of the traffic pool f ; Where n is the number of SIM cards activated in the traffic pool, and f i is the real-time usage of the i-th SIM card, where i belongs to n; The working process of the data analysis module includes: Dividing the traffic usage requirements of the shared traffic pool into stages according to the date of each month; According to the data of the traffic usage of the i-th SIM card changing with time, obtain the function f i (t) of the traffic usage of the i-th SIM card changing with time at each stage; Substitute the function f i (t) of the data volume usage of the i-th SIM card at each stage over time into the formula to calculate the function p f (t) of the data volume usage of the traffic pool over time; According to the function \(f_{i}(t)\) of the traffic usage of the \(i\)-th SIM card changing with time at each stage, a calculation model for the traffic usage risk coefficient of the traffic pool is constructed, and the expression is: i (t) where m is the number of stages, p fj (t) is the actual usage function of the flow rate in the j-th stage flow pool varying with time, p fj0 (t) is the standard usage function of the flow rate in the j-th stage flow pool varying with time as set, α j is the weight coefficient corresponding to the j-th stage, where j belongs to m, ΔSP T is the set state reference value, and ρ is the real-time flow rate usage risk coefficient of the flow pool.

2. The traffic monitoring and regulation system for the SIM card sharing traffic pool according to claim 1, wherein The working process of dividing the traffic usage requirements of the shared traffic pool into stages according to the date of each month includes: Dividing the 1st day of each month to the 6th day from the end of the month into the first stage, the 5th day from the end of the month into the second stage, the 4th day from the end of the month into the third stage, the 3rd day from the end of the month into the fourth stage, the 2nd day from the end of the month into the fifth stage, and the 1st day from the end of the month into the sixth stage; According to different stages, the traffic usage of the traffic pool set in each stage increases in turn.

3. The traffic monitoring and regulation system for a SIM card sharing traffic pool according to claim 2, characterized in that, The working process of the status evaluation module includes: Comparing the total traffic usage of the traffic pool in the current stage with the set standard usage range; If the total traffic usage of the traffic pool is less than or within the set standard usage range, it means that the traffic usage is normal; If the total traffic usage of the traffic pool is greater than the set standard usage range, it means that there is a risk in traffic usage.

4. A traffic monitoring and regulation system for a SIM card sharing traffic pool according to claim 3, characterized in that, The working process of the policy regulation module includes: When the total traffic usage of the traffic pool is less than the set standard usage range, no standby SIM card needs to be activated; When the total traffic usage of the traffic pool is within the set standard usage range, activate x standby SIM cards to cope with emergencies; When the total traffic usage of the traffic pool is greater than the set standard usage range, activate y standby SIM cards to cope with emergencies.

5. The flow monitoring and regulation system for a SIM card sharing traffic pool according to claim 4, characterized in that, The process of obtaining the number of standby SIM cards includes: When the total traffic usage of the traffic pool is within the set standard usage range, x = total number of activated SIM cards * 3%; When the total traffic usage of the traffic pool is greater than the set standard usage range, calculate the current traffic usage risk coefficient ρ of the traffic pool; Calculate y through the following formula: y = x + (ρ - ρ0) * δ; In the formula, ρ0 is the preset threshold of the real-time traffic usage risk coefficient of the traffic pool, and δ is the conversion coefficient.

6. The traffic monitoring and regulation system for a SIM card sharing traffic pool according to claim 5, characterized in that, The traffic usage of the traffic pool is adjusted according to the operator's maintenance time. The adjustment method is: Obtain the operator's maintenance time in real-time. When the operator's maintenance time is from the 1st day of each month to the 6th day from the end of the month, the set traffic usage of the traffic pool remains unchanged, that is, the initial set usage; When the operator's maintenance time is from the 5th day from the end of the month to the last day of the month and the maintenance time is less than 8 hours, the set traffic usage of the traffic pool remains unchanged, the initial set usage; When the operator's maintenance time is from the 5th day before the end of the month to the last day of the month, and 16 hours > maintenance time ≥ 8 hours, the usage ratio on the day before the system maintenance date is reduced by 1 percentage point; When the operator's maintenance time is from the 5th day before the end of the month to the last day of the month, and 24 hours > maintenance time ≥ 16 hours, the usage ratio on the day before the system maintenance date is reduced by 2 percentage points; When the operator's maintenance time is from the 5th day before the end of the month to the last day of the month, and 24 hours ≥ maintenance time, the usage ratio on the day before the system maintenance date is reduced by 3 percentage points.

Citation Information

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