Network communication management equipment and management method thereof

Abstract

The invention relates to the technical field of network communication management, and particularly discloses network communication management equipment and a management method thereof, and the equipment comprises a communication data interface layer which is used for obtaining communication data information at an interface in real time; the data analysis layer is used for analyzing the communication data information and performing node division on the data to obtain a main node and a plurality of secondary nodes; the data analysis layer is also used for analyzing the data types of the main node and the plurality of secondary nodes, and obtaining an adjustment strategy according to an analysis result; the information generation layer is used for generating network communication management adjustment information according to the adjustment strategy result; the data service layer is used for providing data service: distributing tasks and performing data division through a main node; executing tasks and dynamically adjusting data through a plurality of secondary nodes; the data service layer comprises a plurality of application servers; the optimization effect of the relevance of the communication information on the whole communication environment is improved, reasonable division of the communication information is achieved, and rationalization of communication overhead is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of network communication management, in particular to a network communication management device and a management method thereof. BACKGROUND

[0002] With the gradual development and in-depth of information construction, in order to comprehensively improve the network communication information guarantee ability, ensure the healthy development of China's social economy, it is particularly important to reasonably and accurately understand and grasp the management and distribution of communication information.

[0003] With the comprehensive coverage of informationization, network facilities, equipment management, line management and information maintenance and a series of network communication information type data gradually increase, the information management level is more and more, and the management program is more and more complex; with the construction and gradual development of communication information management system, the systematic communication management device is also gradually improved; especially in the information distribution, the reasonable communication information distribution mode can gradually explore the potential correlation of information mining data, and scientifically divide in the communication management system and further improve the load balancing and reasonable distribution of communication overhead.

[0004] The existing communication information network model only divides the number of information, lacks the correlation of communication information to the optimization effect of the whole communication environment, and is easy to lead to unreasonable information allocation and division, which increases the unnecessary overhead of communication information management. SUMMARY

[0005] The purpose of the present application is to provide a network communication management device and a management method thereof, which solves the following technical problems:

[0006] How to improve the correlation of communication information to the optimization effect of the whole communication environment, realize the reasonable division of communication information, and realize the rationalization of communication overhead.

[0007] The purpose of the present application can be realized by the following technical scheme:

[0008] A network communication management device, comprising:

[0009] A communication data interface layer for acquiring communication data information at the interface in real time;

[0010] A data analysis layer for analyzing communication data information and dividing data nodes, acquiring a master node and a plurality of secondary nodes;

[0011] The data analysis layer is also used for analyzing the data types of the master node and the plurality of secondary nodes, and acquiring an adjustment strategy according to the analysis result;

[0012] An information generation layer for generating network communication management adjustment information according to the adjustment strategy result;

[0013] a data service layer for providing data services: distributing tasks and dividing data by the master node; executing tasks and dynamically adjusting data by the plurality of secondary nodes;

[0014] The data service layer comprises a plurality of application servers.

[0015] Preferably, the data analysis layer comprises a historical communication data query module and a correlation analysis module; and the data service layer further comprises a dynamic adjustment module.

[0016] Preferably, the communication data interface layer is further configured to connect external interfaces, wherein the external interfaces are configured to receive external communication data by setting data switches and routers, and the external interfaces comprise upper-layer network management interfaces, lower-layer network management interfaces, statistical analysis interfaces, office file interfaces, and optical cable monitoring module interfaces.

[0017] A network communication management method, the method comprising:

[0018] transmitting the communication data at the external interfaces to the data analysis layer through the communication data interface layer;

[0019] analyzing the communication data information and dividing data into nodes by the data analysis layer, to obtain a master node and a plurality of secondary nodes;

[0020] analyzing the data types of the master node and the plurality of secondary nodes by the historical communication data query module and the correlation analysis module, and obtaining an adjustment strategy according to the analysis results;

[0021] generating network communication management adjustment information according to the adjustment strategy results by the information generation layer.

[0022] Preferably, a data service process is completed after the network communication management adjustment information is generated, wherein the data service process is for providing data services according to the data service layer:

[0023] the master node distributes tasks and divides data by a plurality of application servers;

[0024] the plurality of secondary nodes execute tasks by the plurality of application servers and dynamically adjust data by a dynamic adjustment module.

[0025] Preferably, the adjustment strategy obtaining process comprises:

[0026] obtaining historical communication data by the historical communication data query module;

[0027] inputting the historical communication data into the correlation analysis module for correlation analysis, to determine whether the correlation coefficient of the data allocation of the master node and the plurality of secondary nodes meets the requirements:

[0028] If yes, keep the current state;

[0029] If no, execute the adjustment strategy.

[0030] Preferably, the adjustment strategy execution process is:

[0031] Calculate the communication data maintenance overhead index of each secondary node;

[0032] Compare the communication data overhead index of each secondary node with the preset threshold value of the corresponding node:

[0033] If greater than the preset threshold value, perform data adjustment, arrange the corresponding secondary nodes in descending order according to the overhead index, and adjust in order;

[0034] If less than the preset threshold value, perform data adjustment, arrange the corresponding secondary nodes in ascending order according to the overhead index, and adjust in order;

[0035] If it belongs to the preset threshold value, keep the current state.

[0036] Preferably, the correlation analysis includes:

[0037] Calculate the correlation coefficient between the master node and the first secondary node by the formula ; wherein, represents the process of obtaining the feedback task data volume from the first secondary node to the master node ; is a preset function; is the feedback task data volume obtained from the first secondary node to the master node ; is the standard value of the feedback task data volume obtained from a certain secondary node to the master node ; is the standard value of the feedback task data volume obtained from a certain secondary node to the master node ; is the proportion coefficient of the data communication overhead contribution value distributed from the first secondary node to the master node total task distribution data communication overhead contribution value;

[0038] Compare the correlation coefficient with the preset correlation coefficient threshold :

[0039] If ∈ , it is judged that the data allocation meets the current node distribution requirements;

[0040] If ∉ If the data distribution does not meet the current node distribution requirement, the data distribution of the secondary node is adjusted.

[0041] Preferably, the adjustment process of the dynamic adjustment module comprises:

[0042] Obtaining the historical communication data query information obtaining overhead contribution value of each secondary node;

[0043] Obtaining the cross-secondary node communication overhead request object generated by the correlation degree analysis module;

[0044] According to the descending order of the overhead request object with too large communication overhead contribution value, and the ascending order of the overhead request object with too small communication overhead contribution value;

[0045] According to the order of the size of the overhead contribution value of the arranged request object relative to the total overhead contribution value, the arranged request object is arranged.

[0046] The present application has the following advantages: the data analysis layer is arranged to ensure the analysis of the communication data information, the data is divided and analyzed to obtain a primary node and multiple secondary nodes, the data analysis layer is also used to analyze the data types of the primary node and the multiple secondary nodes, and an adjustment strategy is obtained according to the analysis result, the information generation layer is arranged to generate network communication management adjustment information according to the adjustment strategy result, the data distribution information state is ensured to be obtained, the data distribution node information is judged, the correlation of the communication information is improved through adjustment analysis to ensure the optimization effect of the overall communication environment, the communication information is reasonably divided, and the communication overhead is rationalized.

[0047] Of course, any product implementing the present application does not necessarily need to achieve all the advantages described above. BRIEF DESCRIPTION OF DRAWINGS

[0048] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0049] Figure 1 A network communication management device structure layer schematic diagram of the present application;

[0050] Figure 2 A network communication management device data analysis layer module schematic diagram of the present application;

[0051] Figure 3Schematic diagram of data service layer component and module of network communication management device of the present application;

[0052] Figure 4 Schematic diagram of external interface of network communication management device of the present application. DETAILED DESCRIPTION

[0053] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0054] Please refer to Figures 1-3 The present application is a network communication management device, which comprises:

[0055] A communication data interface layer is configured to acquire communication data information in real time.

[0056] A data analysis layer is configured to analyze the communication data information, divide the data into nodes, acquire a primary node and a plurality of secondary nodes.

[0057] The data analysis layer is further configured to analyze the data types of the primary node and the plurality of secondary nodes, and acquire an adjustment strategy according to the analysis result.

[0058] An information generation layer is configured to generate network communication management adjustment information according to the adjustment strategy result.

[0059] A data service layer is configured to provide data services, including: distributing tasks and dividing data through the primary node; and executing tasks and dynamically adjusting data through the plurality of secondary nodes.

[0060] The data service layer comprises a plurality of application servers.

[0061] Through the above technical solution, the existing communication information network model only performs quantity division of information, lacks the optimization effect of the correlation of communication information on the overall communication environment, and is prone to cause unreasonable information distribution and division, thereby increasing unnecessary overhead of communication information management.

[0062] The present application is designed to solve the above technical problems, and comprises a communication data interface layer, a data analysis layer, an information generation layer and a data service layer to realize the integrated management process of receiving, processing, distributing and adjusting analysis of communication data.

[0063] The communication data interface layer is arranged to realize real-time acquisition of communication data information at the data interface, and to complete a preliminary transmission process of the communication information. The transmitted communication data is temporarily stored in the data analysis layer for further analysis. The data analysis layer is arranged to ensure analysis of the communication data information, specifically, node division analysis of the data, and obtaining a primary node and multiple secondary nodes. The data analysis layer is also used to analyze the data types of the primary node and the multiple secondary nodes, and to obtain an adjustment strategy according to the analysis result. The information generation layer is arranged to generate network communication management adjustment information according to the adjustment strategy result, to ensure acquisition of data distribution information status, and to determine whether the data distribution node information meets the requirements, and to further perform adjustment analysis.

[0064] Finally, the data service layer is arranged to ensure provision of data services. The specific data service tasks include: first, task distribution and data division through the primary node; second, task execution and data dynamic adjustment through the multiple secondary nodes. The data service layer in this embodiment includes multiple application servers, which are composed of n application servers, and is specifically responsible for information processing and logical analysis of the analyzed communication data in the communication management. The main feature of the data service layer is to convert the communication requirements proposed by the presentation layer into internal requirements of the data service layer, and to upload the feedback result of the data service layer to the presentation layer. Through this process, the information management process becomes transparent and open, and humanized management of the entire communication resource management platform is realized in a certain sense. The number of the n application servers is determined according to the actual information data service requirement type.

[0065] This embodiment ensures that the above device component structure realizes improvement of the correlation of the communication information and optimization of the overall communication environment, realizes reasonable division of the communication information, and realizes rationalization of the communication overhead.

[0066] As an embodiment of the present application, refer to Figures 2-3 The data service layer also includes a dynamic adjustment module.

[0067] Through the above technical solution, the data analysis layer in this embodiment includes two modules: a historical communication data query module and a correlation degree analysis module. The historical communication data query module is used to ensure realization of data screening of the communication data stored in the historical communication database, research of division methods, and division of the data with high correlation into the same secondary node for execution, to ensure reasonable division of the data, and to realize economy of the communication and high data processing efficiency.

[0068] Intelligent scheduling module: FPGA+MCU architecture (FPGA model Xilinx XC7K325T, MCU model STM32H743) is adopted, ECMP equivalent multi-path algorithm is built-in, Telemetry push mode is adopted for data transmission protocol, and the transmission frequency is 1 second / time;

[0069] Load monitoring unit: node state data is collected through SNMPv3 protocol, and monitoring parameters include CPU usage, bandwidth utilization, memory occupancy and link delay;

[0070] Fault self-healing module: built-in FRR fast reroute algorithm, supporting automatic switching within 100ms for link failure, 1+1 redundant backup for power module (input voltage AC100-240V or HVDC180-300V), and N+1 redundant fan for cooling module (front air inlet and rear air outlet, noise≤72dBA at maximum speed).

[0071] As an embodiment of the present application, please refer to Figure 4 The communication data interface layer is also used to connect external interfaces, and external communication data is received through setting data switches and routers at the external interfaces, and the external interfaces include upper layer network management interfaces, lower layer network management interfaces, statistical analysis interfaces, office file interfaces and optical cable monitoring module interfaces.

[0072] Through the above technical solutions, the communication data interface layer in the embodiment also acts on the connection of external interfaces; since the access layer of the communication data interface layer should be consistent with the type of communication data transmission, a corresponding imported data switch is required, and a router is also required to be set on the corresponding local area network for wireless transmission; commonly used external interfaces include upper layer network management interfaces, lower layer network management interfaces, statistical analysis interfaces, office file interfaces and optical cable monitoring module interfaces; in specific implementation, the type and number of transmission access points should be designed according to the actual communication data information transmission.

[0073] The present application also designs a network communication management method, which is applied to the above network communication management device, and the method comprises:

[0074] The communication data at the external interface is transmitted to the data analysis layer through the communication data interface layer;

[0075] The communication data information is analyzed through the data analysis layer, and the data is divided into nodes to obtain a master node and a plurality of secondary nodes;

[0076] The data types of the master node and the plurality of secondary nodes are analyzed through the historical communication data query module and the correlation analysis module, and an adjustment strategy is obtained according to the analysis result;

[0077] The information generation layer generates network communication management adjustment information based on the adjustment strategy results.

[0078] Based on the above technical solution, this embodiment designs a network communication management method based on a network communication management device, which specifically includes: First, transmitting communication data from the external interface to the data analysis layer through the communication data interface layer; then, analyzing the communication data information and dividing the data into nodes through the data analysis layer to obtain the main node and multiple secondary nodes;

[0079] Next, the data types of the main node and multiple secondary nodes are analyzed through the historical communication data query module and the correlation analysis module, and adjustment strategies are obtained based on the analysis results. The adjustment strategies are determined based on the data distribution characteristics and whether the distribution correlation between the main node data and the secondary node data meets the distribution requirements. Finally, the network communication management adjustment information is generated through the information generation layer based on the adjustment strategy results.

[0080] In one embodiment of the present invention, after the network communication management adjustment information is generated, a data service process is completed. The data service process provides data services according to the data service layer.

[0081] The master node completes the distribution task and data partitioning through multiple application servers;

[0082] Multiple sub-nodes complete their tasks through multiple application servers and dynamically adjust data through a dynamic adjustment module.

[0083] Through the above technical solution, this embodiment also completes the data service process after the network communication management adjustment information is generated. The specific data service process is implemented by the data service layer providing data services. Therefore, the data service layer provides data services specifically including: setting up a master node to use multiple application servers to complete the distribution task and perform data partitioning; setting up multiple secondary nodes to use multiple application servers to complete the execution task and dynamically adjusting the data through the dynamic adjustment module.

[0084] As one embodiment of the present invention, the process of obtaining the adjustment strategy includes:

[0085] Historical communication data can be obtained through the historical communication data query module;

[0086] Historical communication data is input into the correlation analysis module for correlation analysis to determine whether the correlation coefficient between the data allocation of the master node and multiple secondary nodes meets the requirements:

[0087] If so, then maintain the current state;

[0088] If not, then implement the adjustment strategy.

[0089] The specific adjustment strategy acquisition process in this embodiment, based on the above technical solution, includes: first, acquiring historical communication data through the historical communication data query module; then, inputting the historical communication data into the correlation analysis module for correlation analysis, and determining whether the correlation coefficient of the data allocation between the main node and multiple secondary nodes meets the requirements: if yes, then maintaining the current state; if no, then executing the adjustment strategy.

[0090] In practical implementation, it is necessary to consider the matching and correlation between the task distribution of the master node and the task execution of the secondary nodes. This is because the correlation between the data obtained in the historical data query stage can realize the data allocation of the secondary nodes. However, for the master node, in the process of data allocation, under the allocation rules, it is necessary to determine in advance whether the data execution type allocated to a certain secondary node matches the task type requirements of the master node. This needs to be adjusted in the adjustment strategy to achieve a balance between data load balancing and communication overhead.

[0091] As one embodiment of the present invention, the adjustment strategy execution process is as follows:

[0092] Calculate the overhead index for maintaining communication data at each secondary node;

[0093] The communication data overhead index of each secondary node is compared with the preset threshold of the corresponding node:

[0094] If the value exceeds the preset threshold, the data will be adjusted by sorting the corresponding sub-nodes in descending order according to their cost exponents and adjusting them sequentially.

[0095] If the value is less than the preset threshold, the data will be adjusted by sorting the corresponding sub-nodes in ascending order according to their cost exponents and adjusting them sequentially.

[0096] If the threshold is met, the current state is maintained.

[0097] Through the above technical solution, the adjustment strategy execution process of this embodiment is specifically as follows: The overhead index of communication data maintenance for each sub-node is calculated; the overhead index of each sub-node is compared with a preset threshold for the corresponding node to determine its magnitude. If it is greater than the preset threshold, data adjustment is performed, and the corresponding sub-nodes are arranged in descending order according to the overhead index, and adjusted sequentially. If it is less than the preset threshold, data adjustment is performed, and the corresponding sub-nodes are arranged in ascending order according to the overhead index, and adjusted sequentially. If it falls within the preset threshold, the current state is maintained.

[0098] As one embodiment of the present invention, the correlation analysis includes:

[0099] Through formula Calculate the master node With the The correlation coefficient between each sub-node ;in, Indicates from the first From secondary nodes to primary nodes The process of obtaining feedback task data; This is a preset function; This represents the degree of matching between the amount of task data fed back by the j-th sub-node in the k-th iteration and the standard value; For from the first From secondary nodes to primary nodes The amount of feedback task data obtained; From a secondary node to the primary node The standard value for the amount of feedback task data obtained; For from the first The data communication overhead contribution value is distributed from each secondary node to the primary node. The weighting coefficient of the total task distribution data communication overhead contribution value;

[0100] The correlation coefficient correlation coefficient threshold Compare:

[0101] like ∈ If so, it is determined that the data allocation meets the current node distribution requirements;

[0102] like ∉ If the data allocation does not meet the current node distribution requirements, then the data allocation for the secondary node will be adjusted.

[0103] Through the above technical solution, this embodiment uses correlation analysis to determine whether the correlation coefficient of the data allocation between the master node and multiple secondary nodes meets the requirements; specifically, it uses the formula... Calculate the master node With the The correlation coefficient between each sub-node ;Analyze correlation coefficients The size of any secondary node to the primary node Standard value of the amount of feedback task data obtained This can reflect the task allocation issue between the master node and the corresponding secondary nodes. The proportion of tasks allocated from the master node to the secondary nodes, along with the corresponding data communication overhead contribution, reflects the degree of correlation between the secondary node and the master node. Furthermore, the correlation coefficient can be used to... correlation coefficient threshold Compare the sizes to determine the correlation coefficient. correlation coefficient threshold The size, if ∈ If the data allocation meets the current node distribution requirements, then it is determined that the data allocation conforms to the current node distribution requirements; if ∉ If the data allocation does not meet the current node distribution requirements, then the data allocation for the secondary node will be adjusted.

[0104] It should be noted that Indicates from the first From secondary nodes to primary nodes The process of obtaining feedback task data; preset functions This is an adjustment function set based on historical data to ensure that the correlation coefficient results are within a specific and reasonable range of communication correlation. For from the first From secondary nodes to primary nodes The amount of feedback task data obtained ; From a secondary node to the primary node The standard value for the amount of feedback task data obtained; For from the first The data communication overhead contribution value is distributed from each secondary node to the primary node. The weighting coefficient of the total task distribution data communication overhead contribution value, and the weighting coefficient is greater than 0;

[0105] As one embodiment of the present invention, the adjustment process of the dynamic adjustment module includes:

[0106] Obtain historical communication data for each secondary node to query information and obtain the cost contribution value;

[0107] The correlation analysis module generates a cross-node communication overhead request object.

[0108] Requests with excessively high communication overhead contributions are sorted in descending order, while those with excessively low communication overhead contributions are sorted in ascending order.

[0109] The cost contribution values ​​of the retrieved request objects are arranged in order of the magnitude of the reduction in cost contribution value relative to the total cost contribution value.

[0110] Through the above technical solution, the adjustment process of the dynamic adjustment module in this embodiment is as follows: First, obtain the historical communication data query information of each sub-node to obtain the cost contribution value; then, obtain the cross-sub-node communication cost request object generated by the correlation analysis module.

[0111] Requests with excessively high communication overhead contributions are sorted in descending order, while those with excessively low communication overhead contributions are sorted in ascending order. The order of the sorted request objects is then determined by the magnitude of the reduction in their overhead contribution relative to the overall overhead contribution.

[0112] The above description is merely an example and illustration of the concept of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the concept of the invention or exceed the scope defined in the claims, they should all fall within the protection scope of the present invention.

Claims

1. A network communication management device, characterized in that, include: The communication data interface layer is used to obtain communication data information at the interface in real time. The data analysis layer is used to analyze communication data and divide the data into nodes to obtain the main node and multiple secondary nodes. The data analysis layer is also used to analyze the data types of the main node and multiple secondary nodes, and to obtain adjustment strategies based on the analysis results; The information generation layer is used to generate network communication management adjustment information based on the results of the adjustment strategy. The data service layer is used to provide data services: distributing tasks and partitioning data through the master node; executing tasks and dynamically adjusting data through multiple secondary nodes; The data service layer includes multiple application servers.

2. The network communication management device according to claim 1, characterized in that, The data analysis layer includes a historical communication data query module and a correlation analysis module; the data service layer also includes a dynamic adjustment module.

3. The network communication management device according to claim 1, characterized in that, The communication data interface layer is also used to connect to external interfaces. The external interfaces receive external communication data by setting up data switches and routers. The external interfaces include: upper-layer network management interface, lower-layer network management interface, statistical analysis interface, office document interface, and optical cable monitoring module interface.

4. A network communication management method, applied to the network communication management device according to any one of claims 1-3, characterized in that, The methods include: The communication data interface layer transmits the communication data from the external interface to the data analysis layer. The data analysis layer analyzes communication data information and divides the data into nodes to obtain the main node and multiple secondary nodes. The historical communication data query module and the correlation analysis module are used to analyze the data types of the main node and multiple secondary nodes, and adjustment strategies are obtained based on the analysis results. The information generation layer generates network communication management adjustment information based on the adjustment strategy results.

5. The network communication management method according to claim 4, characterized in that, After the network communication management adjustment information is generated, the data service process is completed. The data service process provides data services according to the data service layer. The master node completes the distribution task and data partitioning through multiple application servers; The multiple sub-nodes complete their tasks through multiple application servers and dynamically adjust their data through a dynamic adjustment module.

6. The network communication management method according to claim 5, characterized in that, The process of obtaining the adjustment strategy includes: Historical communication data can be obtained through the historical communication data query module; Historical communication data is input into the correlation analysis module for correlation analysis to determine whether the correlation coefficient between the data allocation of the master node and multiple secondary nodes meets the requirements: If so, then maintain the current state; If not, then implement the adjustment strategy.

7. A network communication management method according to claim 6, characterized in that, The adjustment strategy is executed as follows: Calculate the overhead index for maintaining communication data at each secondary node; The communication data overhead index of each secondary node is compared with the preset threshold of the corresponding node: If the value exceeds the preset threshold, the data will be adjusted by sorting the corresponding sub-nodes in descending order according to their cost exponents and adjusting them sequentially. If the value is less than the preset threshold, the data will be adjusted by sorting the corresponding sub-nodes in ascending order according to their cost exponents and adjusting them sequentially. If the threshold is met, the current state is maintained.

8. A network communication management method according to claim 6, characterized in that, The correlation analysis includes: Through formula Calculate the master node With the The correlation coefficient between each sub-node ;in, Indicates from the first From secondary nodes to primary nodes The process of obtaining feedback task data; This is a preset function; For from the first From secondary nodes to primary nodes The amount of feedback task data obtained; From a secondary node to the primary node The standard value for the amount of feedback task data obtained; For from the first The data communication overhead contribution value is distributed from each secondary node to the primary node. The weighting coefficient of the total task distribution data communication overhead contribution value; The correlation coefficient correlation coefficient threshold Compare: like ∈ If so, it is determined that the data allocation meets the current node distribution requirements; like ∉ If the data allocation does not meet the current node distribution requirements, then the data allocation for the secondary node will be adjusted.

9. A network communication management method according to claim 5, characterized in that, The adjustment process of the dynamic adjustment module includes: Obtain historical communication data for each secondary node to query information and obtain the cost contribution value; The correlation analysis module generates a cross-node communication overhead request object. Requests with excessively high communication overhead contributions are sorted in descending order, while those with excessively low communication overhead contributions are sorted in ascending order. The cost contribution values ​​of the retrieved request objects are arranged in order of the magnitude of the reduction in cost contribution value relative to the total cost contribution value.

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