Centralized controller gateway supporting off-network resume and data cache recovery method

Abstract

The application discloses a centralized controller gateway supporting off-network continuous transmission and a data cache recovery method, and relates to the communication technical field.The gateway comprises a state fingerprint construction unit, an off-network cache unit and a continuous transmission recovery unit.The state fingerprint construction unit is used for extracting the implicit features of a communication link and constructing a communication state fingerprint in real time during the normal communication stage of a centralized controller and a terminal device.The off-network cache unit is used for dynamically dividing the data cache segmentation boundary and the check granularity based on the last generated communication state fingerprint when detecting network interruption, and simultaneously caching the business data stream and the corresponding control context state.The application relates to the communication technical field.The centralized controller gateway supporting off-network continuous transmission and the data cache recovery method can dynamically adjust the cache and continuous transmission strategy according to the communication state fingerprint during network interruption, effectively cope with network fluctuation, and enhance the stability of the communication between the centralized controller and the terminal device.

Description

Technical Field

[0001] This invention relates to the field of communication technology, and more specifically, to a centralized controller gateway that supports resume transmission after network outage and a data cache recovery method. Background Technology

[0002] In actual industrial environments, network communication often faces many unstable factors, including wireless signal attenuation, electromagnetic interference, link switching, equipment movement, network equipment failure, power fluctuations, extreme weather, etc., which can cause the communication link between the central controller and terminal equipment to frequently experience short or long periods of network outage.

[0003] Traditional centralized controller gateways typically cannot effectively handle data transmission during network outages, leading to data loss or disordered transmission sequences. Once the network is restored, the lack of accurate recording and analysis of the communication state before the outage makes it difficult to reassemble and retransmit data in a logical order, and also makes it difficult to guarantee semantic consistency between control commands and corresponding data streams. This not only affects the integrity of data transmission but may also cause terminal devices to perform erroneous operations, reducing the reliability and stability of the entire system.

[0004] For example, in some industrial automation control systems, the central controller needs to send control commands to terminal devices and receive feedback data in real time. If critical control commands or feedback data are being transmitted during a network outage, and the transmission cannot be resumed correctly after network recovery, it may lead to production accidents. Therefore, developing a central controller gateway that supports resuming transmission after network outages is of significant practical importance. Summary of the Invention

[0005] The purpose of this invention is to provide a centralized controller gateway and data cache recovery method that support network interruption resumption. This solves the problem that traditional centralized controller gateways often cannot effectively handle data being transmitted during network interruptions, leading to data loss or disordered transmission order. After network recovery, due to the lack of accurate recording and analysis of the communication state before the network interruption, it is difficult to reassemble and retransmit data in a reasonable order, and it is also difficult to ensure the semantic consistency between control commands and corresponding data streams, thus failing to meet usage requirements.

[0006] This invention achieves the above objective through the following technical solution: a centralized controller gateway that supports resumed data transmission after network outage, the gateway comprising: Status fingerprint construction unit, network outage caching unit, and resume transmission recovery unit; The state fingerprint construction unit is used to extract the implicit features of the communication link and construct the communication state fingerprint in real time during the normal communication phase between the central controller and the terminal device. The network outage caching unit is used to dynamically divide the data caching segment boundaries and verification granularity based on the most recently generated communication state fingerprint when a network outage is detected. At the same time, it caches the service data stream and the corresponding control context state, and associates and marks the control command sequence with the data generation time sequence. The resume transmission recovery unit is used to guide the data reassembly order and retransmission strategy according to the communication status fingerprint when network recovery is detected, and to perform semantic consistency verification and replay order adjustment based on the coupling relationship between control commands and data streams, so as to realize network interruption resume transmission.

[0007] Furthermore, the communication link latent feature parameters extracted by the state fingerprint construction unit include: Three key indicators: latency jitter, packet loss pattern, and ACK round-trip rhythm; The state fingerprint construction unit collects the raw data of the three key indicators in real time, and constructs a standardized communication state fingerprint vector after normalization processing. The normalization process is used to eliminate the dimensional differences between different feature dimensions, so that the feature values ​​are mapped to a preset numerical range.

[0008] Furthermore, when the state fingerprint construction unit collects latency jitter data, the collection period is adaptively configured according to the data transmission rate; When calculating packet loss pattern parameters, a time window of preset length is used, the batch size is configured according to the business type, and dynamic tracking of packet loss patterns is achieved by sliding the continuous window. When recording ACK round-trip rhythm data, the statistical period is kept consistent with the latency jitter acquisition period, and the temporal distribution characteristics of the ACK response are recorded synchronously.

[0009] Furthermore, the normalization process includes the following steps: When the historical statistical data meets the preset duration requirement, the minimum and maximum values ​​of the features within the historical statistical period are used as the normalization calculation benchmark. When historical statistical data is insufficient for the preset time period, the default feature value range of the industry standard is used as the calculation benchmark.

[0010] Furthermore, the network disconnection caching unit includes the following steps: Network status is monitored through a dual judgment mechanism that combines heartbeat packet detection and data transmission timeout detection; The heartbeat packets are sent at a fixed period. If no response is received for a preset number of consecutive times, a primary network outage warning is triggered. The data transmission timeout threshold can be configured differently according to service priority, and a network interruption is confirmed when a timeout is triggered.

[0011] Furthermore, the network disconnection buffer unit determines the basic segment length based on the latency jitter feature value in the most recent communication state fingerprint, and the latency jitter and the basic segment length have a negative correlation. The data verification granularity was adjusted based on the packet loss rate statistics before the network outage, and the packet loss rate and verification granularity showed a positive correlation and fit. The basic segment length is preset with a default value based on the business data type, and the verification granularity is preset with a default verification information ratio based on the business data type.

[0012] Furthermore, the network disconnection caching unit pre-constructs a causal coupling model between the control command stream and the business data stream, clarifying the mapping relationship between the control command and the corresponding triggered data stream; The cache synchronously stores the original content of the business data stream and the complete context state of the corresponding control instructions. The control context state includes the instruction type, execution time, parameter configuration, and execution result feedback information. The associated marker includes a unique identifier for the control instruction, a timestamp for data segmentation and a sequence number, which, together with the verification information and segmentation identifier, constitute a complete cached data unit.

[0013] Furthermore, the resume recovery unit includes the following steps: The network recovery status is detected by link quality probe frames. When a preset number of valid responses are received consecutively, and the response latency and packet error rate both meet preset conditions, the network is determined to be recovered. After the network is restored, the central controller gateway exchanges the most recent communication status fingerprint with the terminal device and performs a consistency check. If there is a discrepancy, the status fingerprint stored on the central controller shall prevail.

[0014] Furthermore, the resume recovery unit dynamically adjusts the data retransmission timeout threshold based on the ACK round-trip rhythm characteristics in the communication state fingerprint; The order of data reassembly should be determined based on business priority and data integrity status. Based on the characteristics of packet loss patterns, the packet loss probability of each data segment is predicted, and a differentiated retransmission strategy is adopted for segments with different packet loss probabilities. The validity of the control command context is verified by using a causal coupling model, a temporal correlation graph is constructed to adjust the data replay order, and a semantic consistency verification formula is used to quantify the verification results to ensure the logical consistency and integrity of the continued data transmission.

[0015] A method for restoring centralized controller data cache that supports resumed data transmission after network outage, applied to a centralized controller gateway that implements the above-mentioned support for resumed data transmission after network outage, the method comprising the following steps: S1. During the normal communication phase between the centralized controller and the terminal equipment, extract the implicit features of the communication link in real time and construct a communication status fingerprint. S2. When a network interruption is detected, the data cache segment boundaries and verification granularity are dynamically divided based on the most recently generated communication state fingerprint. At the same time, the business data stream and the corresponding control context state are cached, and the control command sequence and data generation sequence are associated and marked. S3. When network recovery is detected, the data reassembly order and retransmission strategy are guided according to the communication status fingerprint. At the same time, semantic consistency verification and replay order adjustment are performed based on the coupling relationship between control commands and data streams to achieve network interruption resumption.

[0016] The beneficial effects of this invention are as follows: 1. By extracting the implicit features of the communication link in real time and constructing the communication state fingerprint through the state fingerprint construction unit, when the network is interrupted, the network outage caching unit can dynamically divide the data cache segment boundaries and verification granularity based on the most recently generated communication state fingerprint, cache the service data stream and the corresponding control context state. This allows the resume transmission recovery unit to accurately guide the data reassembly order and retransmission strategy based on the communication state fingerprint after the network is restored, effectively avoiding data loss and transmission order disorder, and greatly improving the integrity of data transmission.

[0017] 2. The network outage caching unit pre-builds a causal coupling model between the control command stream and the business data stream, clarifies the mapping relationship between the control command and the corresponding triggered data stream, and synchronously stores the original content of the business data stream and the complete context state of the corresponding control command during caching. The resume transmission recovery unit verifies the validity of the control command context based on this causal coupling model, builds a time-series correlation graph to adjust the data replay order, and uses a semantic consistency verification formula to quantify the verification result. This series of measures ensures the logical consistency and integrity of the resumed data and avoids the terminal device from performing erroneous operations due to receiving data in the wrong order or incompletely.

[0018] 3. The network outage caching unit uses a dual-judgment mechanism that combines heartbeat packet detection and data transmission timeout detection to monitor network status. Heartbeat packets are sent at fixed intervals, and if a preset number of consecutive responses are not received, a primary network outage warning is triggered. The data transmission timeout threshold can be configured differently according to service priority. If a timeout is triggered, network outage is confirmed. This dual-judgment mechanism improves the accuracy and timeliness of network outage detection, can trigger network outage caching operations more reliably, and reduces the risk of data loss.

[0019] 4. Based on different characteristic parameters in the communication status fingerprint, the data caching and retransmission strategies are dynamically adjusted. The basic segment length is determined based on the latency jitter characteristic value, and the data verification granularity is adjusted in combination with the packet loss rate. The data retransmission timeout threshold is dynamically adjusted based on the ACK round-trip rhythm characteristics. The data reassembly order is determined according to the service priority and data integrity status. The packet loss probability of each data segment is predicted based on the packet loss pattern characteristics, and a differentiated retransmission strategy is adopted for segments with different packet loss probabilities. These optimization strategies make data caching and retransmission more efficient and reasonable, and improve the overall performance of the system.

[0020] 5. The centralized controller gateway and data cache recovery method supporting network interruption resumption provided by this invention can effectively deal with network interruption problems, ensure the integrity of data transmission and the semantic consistency of control commands and data streams. This makes the communication between the centralized controller and terminal devices more reliable, reduces system failures and production accidents caused by network interruptions, and improves the reliability and stability of the entire system. It is suitable for various scenarios with high data transmission requirements, such as industrial automation, intelligent transportation and other fields. Attached Figure Description

[0021] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a system block diagram of the present invention; Figure 2 This is a flowchart of the state fingerprint construction process of the present invention; Figure 3 This is a flowchart of the offline caching process of the present invention; Figure 4 This is a flowchart of the overall method of the present invention. Detailed Implementation

[0022] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0023] Example 1: Please see Figure 1-3 This invention provides a technical solution: a centralized controller gateway that supports resume download after network outage, the gateway comprising: Status fingerprint construction unit, network outage caching unit, and resume transmission recovery unit; The state fingerprint construction unit is used to extract the implicit features of the communication link and construct the communication state fingerprint in real time during the normal communication phase between the central controller and the terminal device. The central controller is a device that centrally manages and controls multiple terminal devices, responsible for communicating with them and coordinating their operation. Terminal devices are located at the network end, receiving management and control from the central controller and interacting with it for data exchange; examples include various sensors and actuators. The communication link is the channel for data transmission between the central controller and the terminal devices, including physical links such as network cables and wireless signals, and logical links such as connection methods defined by specific communication protocols. Latent features are factors in the communication link that are not easily observed or measured directly but reflect the communication status and characteristics, such as signal strength variation patterns and transmission delay fluctuations. A communication status fingerprint is obtained by extracting and comprehensively processing the latent features of the communication link; it uniquely identifies the communication status at a specific moment and is used to guide data processing during network interruptions and recovery. The network outage caching unit is used to dynamically divide the data caching segment boundaries and verification granularity based on the most recently generated communication state fingerprint when a network outage is detected. At the same time, it caches the service data stream and the corresponding control context state, and associates and marks the control command sequence with the data generation time sequence. Among these, network interruption refers to a failure in the communication link between the centralized controller and terminal devices, resulting in the inability to transmit data normally; data cache segmentation boundary is the boundary for dividing the cached business data stream into different segments based on the communication state fingerprint during network interruption, used to clarify the range of each segment during subsequent data reassembly; verification granularity refers to the fineness of verifying cached data and control commands, such as whether verification is performed on a single data packet or on a combination of a certain number of data packets; business data stream refers to the data related to specific services transmitted between the centralized controller and terminal devices, such as monitoring data collected by sensors and control commands from actuators; control context state refers to the state of the centralized controller during network interruption. The control process of terminal devices includes status information such as the currently executed control task and related parameter settings, which is used to accurately restore the control process after network recovery. The control command sequence is a series of control commands sent by the central controller to the terminal devices. These commands are arranged in a certain order and time relationship to achieve precise control of the terminal devices. The data generation sequence is the time order in which each piece of data in the business data stream is generated. Ensuring the correctness of the data timing is crucial for maintaining the normal operation of the business during network interruption and recovery. The association tag is an identification relationship established between the control command sequence and the data generation sequence, which is used to clarify the order and logical relationship between control commands and corresponding data when the network is restored. The resume and recovery unit is used to guide the data reassembly order and retransmission strategy according to the communication status fingerprint when the network is detected to be restored. At the same time, it performs semantic consistency verification and replay order adjustment based on the coupling relationship between control commands and data streams to realize network interruption resume transmission. Among these, network recovery refers to the restoration of the communication link between the previously interrupted central controller and terminal devices, enabling normal data transmission again; data reassembly order determines the order in which cached data is reassembled into a complete and ordered data stream based on communication status fingerprints and previously cached data segment boundaries after network recovery; retransmission strategy establishes rules and methods for retransmitting cached data and control commands after network recovery, such as which data needs to be retransmitted and with what priority; semantic consistency verification checks the logical relationship between control commands and data streams to ensure that the operations of control commands on data are semantically coherent and consistent during network interruption and recovery, avoiding data errors or control confusion caused by network problems; replay order adjustment adjusts the replay order of control commands and data streams based on the results of semantic consistency verification to ensure correct service execution; and network interruption resumption is the function that, after network interruption, can accurately and completely continue transmitting data that was not successfully transmitted during the interruption based on previously cached data and related status information upon network recovery, restoring normal service operation.

[0024] It should be noted that during use, the state fingerprint construction unit extracts latent features to construct fingerprints during normal communication, providing an accurate state baseline for subsequent network outage processing. This allows the gateway to clearly understand the communication status. The network outage caching unit dynamically divides cache segment boundaries and verification granularity based on the latest fingerprints, flexibly adapting to different communication scenarios and rationally allocating cache resources. It caches business data streams and control context states and associates tag instructions with data timing, ensuring data integrity and clear logical relationships during network outages, avoiding data loss and confusion. The resume and recovery unit uses fingerprints to guide data reassembly and retransmission, enabling rapid and orderly recovery of data transmission. It performs semantic consistency verification and replay order adjustment to ensure the correct execution of business logic. The overall design improves the stability and reliability of the gateway in complex network environments, effectively reducing business interruptions and data loss caused by network outages, and ensuring the continuous and stable operation of the system.

[0025] In one embodiment, during the normal communication phase between the central controller and the terminal device, the implicit features of the communication link are extracted in real time and a communication state fingerprint is constructed, including: The centralized controller gateway collects the core implicit characteristic parameters of the communication link in real time. The implicit characteristic parameters specifically cover three key indicators: latency jitter, packet loss mode, and ACK round-trip rhythm. Real-time acquisition of latency jitter data from the communication link:

[0026] in, This indicates the total number of samples within the preset collection period. The collection period is adaptively configured according to the data transmission rate: transmission rate The time collection cycle is , The time collection cycle is , The time collection cycle is ; Indicates the first The instantaneous latency jitter value of each acquisition ensures the real-time performance and integrity of feature capture; The packet loss pattern parameters are statistically analyzed within a preset time window. The time window length is set to 10 data transmission batches, and the batch size is configured according to the service type: 100 frames / batch for industrial control services and 500 frames / batch for data acquisition services, including packet loss rate. That is, the ratio of the number of packet losses within the window to the total number of transmitted data packets, and the packet loss interval sequence:

[0027] in, This indicates the number of packet losses within that time window. Indicates the first Next and first The time interval between packet loss events is dynamically tracked by using continuous window sliding statistics to achieve packet loss patterns. Record ACK round-trip rhythm data:

[0028] in, This indicates the total number of ACK responses within a preset statistical period, which is consistent with the latency jitter collection period. Indicates the first The round-trip time from sending a data frame to receiving the corresponding ACK confirmation frame is recorded synchronously, along with the timing distribution characteristics of the ACK response. The collected raw feature data, including latency jitter, packet loss pattern, and ACK round-trip rhythm, are normalized to eliminate the differences in the units of measurement of different feature dimensions, and a standardized communication state fingerprint vector is constructed.

[0029] in, These are the normalized latency jitter characteristic values. These are the normalized packet loss pattern feature values. The normalized ACK round-trip rhythm feature value; The normalization formula is:

[0030] in, The raw data collected for a certain type of feature. This is the minimum value of this feature within the most recent 72-hour historical statistical period. The maximum value of this feature within the most recent 72-hour historical statistical period is used to map the normalized feature value range to... interval; If the historical statistical data is less than 72 hours, the industry standard default threshold will be used, and the default range for latency jitter will be [value missing]. The default range for packet loss rate is [value missing]. The default range for ACK round-trip time is As and This facilitates subsequent feature fusion and decision calculation.

[0031] This design allows for the real-time acquisition of three types of implicit feature parameters during normal communication: latency jitter, packet loss patterns, and ACK round-trip rhythm, to construct a fingerprint that accurately grasps the communication link status. An adaptive acquisition cycle ensures the real-time and completeness of feature capture at different transmission rates. Dynamic packet loss patterns enable dynamic tracking. The synchronous timing distribution of ACK round-trip rhythm is recorded, and normalization eliminates dimensional differences, constructing a standardized fingerprint vector. This provides a benchmark for subsequent network outage handling, enabling the gateway to flexibly adjust its strategies based on actual network conditions. This effectively addresses various complex network environments, ensuring communication stability and reliability, and reducing data transmission problems caused by network fluctuations.

[0032] In one embodiment, when a network interruption is detected, the data cache segment boundaries and verification granularity are dynamically divided based on the most recently generated communication state fingerprint, including: The centralized controller gateway monitors network status in real time through a link connectivity detection mechanism, which uses a dual determination of heartbeat packets and data transmission timeout. The heartbeat packet is sent every 1 second. If no heartbeat response is received for 3 consecutive times, a primary network outage warning will be triggered. Simultaneously set the data transmission timeout threshold, with a default value of [value missing]. The timeout threshold can be adjusted according to business priority: The timeout threshold for urgent business is... Ordinary business is Non-critical business is If a timeout occurs, the network interruption is confirmed. After a network interruption is triggered, the system automatically extracts the most recently generated and stored communication state fingerprint:

[0033] This fingerprint serves as the core basis for adjusting the data caching strategy after network outage, ensuring that the caching configuration matches the communication status before network outage. Based on the time delay jitter feature value in state fingerprinting The base segment length is determined by adjusting the base segment length based on the magnitude of latency jitter, in order to improve the flexibility of data reassembly. The specific calculation formula is as follows:

[0034] in, The default segment length is set according to the business data type: the default segment length for text data is [value missing]. The default segment length for binary file data is [length missing]. The default segment length for streaming media data is [length missing]. ; The latency jitter impact coefficient is determined using an adaptive rule: when That is, during low latency jitter, ; when That is, during moderate time delay jitter, ; when That is, during high latency jitter, Ensure that the segment length adjustment is adapted to the network status; Combined with packet loss rate statistics before the network outage Adjusting the data validation granularity: The higher the packet loss rate, the finer the validation granularity, reducing the risk of data loss. The formula for calculating validation granularity is:

[0035] in, The default validation granularity, i.e., the proportion of validation information in each data segment: the default validation granularity for text data is [value missing]. ,Every Data Configuration Verification information, binary file type data is ,Every Data Configuration Verification information, streaming media data is ,Every Data Configuration Verification information; The rule for determining the impact coefficient of packet loss rate is as follows: when That is, at a low packet loss rate, ; when That is, at a moderate packet loss rate, ; when That is, when the packet loss rate is high, Optimize configuration based on the verification success rate of historical transmission data; Based on the adjusted segment length and verification granularity, the business data to be transmitted after the network outage is dynamically segmented. Each data segment contains complete business data content and a unique segment identifier, consisting of a 16-bit random number and a 4-bit segment sequence number, ensuring global uniqueness. Verification information is generated based on the verification granularity. Text data uses CRC32 checksum, binary files use SHA-256 hash value, and streaming media uses MD5 checksum. At the same time, the segment generation timestamp is recorded, accurate to the millisecond level, to provide a basis for subsequent retransmission priority determination.

[0036] This design dynamically divides data cache segment boundaries and verification granularity based on the most recent fingerprint when the network is interrupted. It accurately configures the cache according to the network state before the network interruption, accurately detects network interruption through a dual judgment mechanism, extracts the most recent fingerprint to ensure that the caching strategy matches the state before the network interruption, and dynamically adjusts the segment length and verification granularity based on latency jitter and packet loss rate. This improves the flexibility of data reassembly and reduces the risk of data loss. It dynamically segments and adds unique identifiers and verification information, records timestamps, provides a basis for subsequent retransmission, ensures data integrity and recoverability during the network interruption, and improves the success rate of network interruption resumption.

[0037] In one embodiment, the service data stream and the corresponding control context state are cached simultaneously, and the control instruction sequence is associated with the data generation timing, including: A causal coupling model of control command flow and business data flow in a centralized controller is pre-constructed. By analyzing the execution logic of control commands and the generation rules of business data, a control command model is established. The data stream generated by the corresponding trigger One-to-one or one-to-many mapping relationship between Clearly define the control source for each segment of business data; Control commands are divided into four categories according to their function: configuration commands, start commands, adjustment commands, and stop commands. Each type of command has a fixed command identifier prefix: CFG for configuration commands, STR for start commands, ADJ for adjustment commands, and STP for stop commands, which facilitates quick association. When a network interruption triggers data caching, while caching the original content of the business data stream, the complete context state of the corresponding control command is also cached synchronously, including the type of control command, execution time (accurate to milliseconds), parameter configuration, key-value pair format storage, execution result feedback, and key information such as success / failure / execution, to ensure the control traceability of cached data. The preferred cache storage medium is local high-speed flash memory, with fast read and write speeds. If the amount of cached data exceeds the flash memory capacity If so, external storage expansion will be automatically enabled to ensure that the cache is not lost; Add a unique association tag to each data segment:

[0038] in, The control instruction corresponding to this data segment is uniquely identified, consisting of an instruction type prefix and an 8-bit sequence number, such as (CFG00000001), and is used to quickly associate the control context. The timestamps generated for data segments are accurate to the millisecond level to ensure the accuracy of time-series sorting; The sequence number of the data segment under the same control command, starting from 0001 and incrementing, is used to identify the position of the segment in the overall data stream; The association marker, data segment verification information, and segment identifier are stored together to form a complete cached data unit. Each unit occupies a fixed header space of 64 bytes, including 32 bytes of association marker, 20 bytes of segment identifier, and 12 bytes of verification information, ensuring that the cached data can achieve accurate matching between the control context and business content after network recovery.

[0039] This design caches business data streams and corresponding control context states during network interruptions, and associates the control instruction sequence with the data generation timeline to ensure the integrity and traceability of cached data. It constructs a causal coupling model to clarify the source of business data control, caches the complete control context to ensure control traceability, prioritizes high-speed storage media to ensure that the cache is not lost, and adds a unique association tag to form a complete cached data unit. This enables accurate matching of control context and business content after network recovery, avoids data and control logic disconnection, ensures that business resumes operation according to the correct logic, and improves the stability and reliability of the system.

[0040] In one embodiment, when network recovery is detected, the data reassembly order and retransmission strategy are guided based on the communication state fingerprint, including: Network recovery is confirmed through a rapid connectivity check between the central controller gateway and terminal devices: After a network outage, the gateway verifies the connectivity of each device. Send a link quality probe frame once. If three consecutive valid responses are received from the terminal device, the response delay is [not specified]. Packet error rate If so, the network is determined to be restored, ensuring that the network link has stable transmission conditions; After the network is restored, the central controller gateway and the terminal devices first exchange their stored fingerprints of the most recent communication status. Through fingerprint consistency verification, all three types of feature values ​​are checked for differences. If the conditions are met, the baseline communication environment before and after the network outage is confirmed. If there are differences in the fingerprints, the state fingerprint stored on the centralized controller shall be used to ensure the consistency of the resume transmission strategy; Based on ACK round-trip rhythm features in state fingerprinting The timeout threshold for data retransmission is dynamically adjusted to avoid misjudgment of retransmissions due to network status fluctuations. The formula for calculating the timeout threshold is:

[0041] in, The default retransmission timeout threshold is configured according to service type: the default timeout threshold for emergency services is [value missing]. Ordinary business is Non-critical business is ; The ACK rhythm influence coefficient is determined by the following rules: when That is, when the ACK round-trip time is short, ; when That is, when the ACK round-trip time is moderate, ; when That is, when the ACK round-trip time is long, Calibration based on historical retransmission success rates; Based on the identification information and sequence number of the data segments Guided by the characteristics of latency jitter and packet loss patterns in the communication status fingerprint, the data reassembly order is determined according to the principle of prioritizing critical services over ordinary services and prioritizing complete segments over missing segments. Critical business data is determined by a preset priority identifier, which is divided into three levels: Level 1 is urgent business, such as equipment control command feedback data; Level 2 is ordinary business, such as routine data collection; and Level 3 is non-critical business, such as log backup. The priority identifier is stored in the header of the data segment. Perform integrity checks on cached data, detect missing or erroneous segments using segmented verification information, and leverage packet loss pattern features in the state fingerprint. Predict the packet loss probability for each segment: when At that time, the predicted packet loss probability is ; when At that time, the predicted packet loss probability is ; when At that time, the predicted packet loss probability is ; The preset packet loss probability threshold is For segments with high packet loss probability, predict the probability. A differentiated retransmission strategy is adopted, featuring multiple retransmissions and a shortened timeout retransmission interval: the number of retransmissions is twice the default number of 3, and the timeout retransmission interval is... ; For segments with low packet loss probability, predict the probability. The standard retransmission strategy is adopted, with a default of 3 retransmissions at intervals of [missing information]. This improves retransmission efficiency.

[0042] This design uses communication status fingerprints to guide data reassembly order and retransmission strategy during network recovery. It optimizes data transmission based on the actual state of the network after recovery, confirms network recovery through rapid connectivity verification, ensures consistent retransmission strategy through fingerprint exchange, dynamically adjusts retransmission timeout threshold based on ACK round-trip rhythm to avoid misjudgment, determines reassembly order according to service priority and segment integrity, predicts segment packet loss probability based on packet loss pattern, and adopts differentiated retransmission strategy. This improves the efficiency and accuracy of data retransmission, ensures priority recovery of critical services, reduces data loss and transmission delay, and enhances the overall performance of the system.

[0043] In one embodiment, semantic consistency verification and replay order adjustment are performed simultaneously based on the coupling relationship between control commands and data streams, including: Based on a pre-built causal coupling model Each data segment to be transmitted is checked individually to verify whether the control command context corresponding to it is complete and valid. The specific verification content includes: control command identifier. Whether it is in the list of valid instructions. The list of valid instructions is maintained in real time by the central controller and includes all issued and valid instructions. Whether the control parameters are complete, with no missing required parameters and optional parameters verified according to business requirements. Whether the execution status is consistent, with the execution status reported by the terminal matching the expected status recorded by the central controller, to ensure that the control logic traceability of data segments is effective. If a missing, invalid, or incomplete control command is detected during the verification process, the control command resynchronization mechanism is immediately triggered: the central controller resends a complete sequence of control commands to the terminal devices in ascending order of control command number, with the resend timeout threshold set to [value missing]. If the retransmission fails, it will be retransmitted twice. After the terminal device confirms receipt, returns an ACK response containing a complete instruction reception identifier and restores the control context, the corresponding data segment will be resumed to avoid data and control logic becoming disconnected. Based on the generation timestamp of data segments Based on the execution timing of control commands, a timing relationship graph of control commands and data segments is constructed: with the execution time of control commands as the horizontal axis and the data generation timestamp as the vertical axis, the data segments are sorted in chronological order. When there are control logic dependencies, such as when an adjustment command needs to take effect after the start command is executed, the data segments are sorted according to the dependencies to ensure that the data is executed in the original generation sequence and control logic dependencies, thus avoiding control logic failures caused by out-of-order segmentation. The semantic consistency check formula is used to quantify the check results:

[0044] in, The total number of data segments to be transmitted. For control commands With corresponding data stream The consistency check results This indicates that the control logic is consistent with the data content. This indicates inconsistency; when If the overall semantics are consistent, execution can be replayed normally. when At that time, segments with inconsistent positioning are addressed through... For the corresponding segment identifier, re-synchronize the control context and verify the data: first, resend the corresponding control command, and then re-verify the consistency between the data and the command, repeating the verification no more than 3 times; if it is still inconsistent after 3 verifications, it is marked as an abnormal segment, stored separately and an alarm mechanism is triggered to send an abnormal alarm to the management platform, including the segment identifier, control command information and the reason for the verification failure, until the overall semantics are consistent.

[0045] This design, during network recovery, performs semantic consistency verification and replay order adjustment based on the coupling relationship between control commands and data streams, ensuring the consistency and correctness of data and control logic. It verifies the control command context through a causal coupling model, triggers a resynchronization mechanism to resolve control command issues, constructs a temporal correlation graph to ensure data is executed according to the original temporal sequence and control logic dependencies, uses a semantic consistency verification formula to quantify results, locates and processes inconsistent segments, marks abnormal segments to trigger alarms, avoids business problems caused by out-of-order segments or control logic failures, ensures the system can operate normally after network recovery, and improves the system's robustness and reliability.

[0046] Example 2: Please see Figure 4 A method for restoring centralized controller data cache that supports resumed data transmission after network outage, applied to a centralized controller gateway that implements the above-mentioned support for resumed data transmission after network outage, the method includes the following steps: S1. During the normal communication phase between the centralized controller and the terminal equipment, extract the implicit features of the communication link in real time and construct a communication status fingerprint. S2. When a network interruption is detected, the data cache segment boundaries and verification granularity are dynamically divided based on the most recently generated communication state fingerprint. At the same time, the business data stream and the corresponding control context state are cached, and the control command sequence and data generation sequence are associated and marked. S3. When network recovery is detected, the data reassembly order and retransmission strategy are guided by the communication status fingerprint. At the same time, semantic consistency verification and replay order adjustment are performed based on the coupling relationship between control commands and data streams to achieve network interruption resumption.

[0047] Those skilled in the art will understand that all or part of the steps in the methods of the above embodiments can be implemented by a program instructing related hardware. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Moreover, this application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0048] The above embodiments provide a detailed description of the present invention. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A centralized controller gateway that supports resumed data transmission after network outage, characterized in that, The gateway includes: Status fingerprint construction unit, network outage caching unit, and resume transmission recovery unit; The state fingerprint construction unit is used to extract the implicit features of the communication link and construct the communication state fingerprint in real time during the normal communication phase between the central controller and the terminal device. The network outage caching unit is used to dynamically divide the data caching segment boundaries and verification granularity based on the most recently generated communication state fingerprint when a network outage is detected. At the same time, it caches the service data stream and the corresponding control context state, and associates and marks the control command sequence with the data generation time sequence. The resume transmission recovery unit is used to guide the data reassembly order and retransmission strategy according to the communication status fingerprint when network recovery is detected, and to perform semantic consistency verification and replay order adjustment based on the coupling relationship between control commands and data streams, so as to realize network interruption resume transmission.

2. The centralized controller gateway supporting resume transmission after network outage as described in claim 1, characterized in that, The communication link latent feature parameters extracted by the state fingerprint construction unit include: Three key indicators: latency jitter, packet loss pattern, and ACK round-trip rhythm; The state fingerprint construction unit collects the raw data of the three key indicators in real time, and constructs a standardized communication state fingerprint vector after normalization processing. The normalization process is used to eliminate the dimensional differences between different feature dimensions, so that the feature values ​​are mapped to a preset numerical range.

3. The centralized controller gateway supporting resume transmission after network outage as described in claim 2, characterized in that: When the state fingerprint construction unit collects latency jitter data, the collection period is adaptively configured according to the data transmission rate. When calculating packet loss pattern parameters, a time window of preset length is used, the batch size is configured according to the business type, and dynamic tracking of packet loss patterns is achieved by sliding the continuous window. When recording ACK round-trip rhythm data, the statistical period is kept consistent with the latency jitter acquisition period, and the temporal distribution characteristics of the ACK response are recorded synchronously.

4. The centralized controller gateway supporting resume transmission after network outage as described in claim 2, characterized in that, The normalization process includes the following steps: When the historical statistical data meets the preset duration requirement, the minimum and maximum values ​​of the features within the historical statistical period are used as the normalization calculation benchmark. When historical statistical data is insufficient for the preset time period, the default feature value range of the industry standard is used as the calculation benchmark.

5. The centralized controller gateway supporting resume transmission after network outage as described in claim 1, characterized in that, The offline caching unit includes the following steps: Network status is monitored through a dual judgment mechanism that combines heartbeat packet detection and data transmission timeout detection; The heartbeat packets are sent at a fixed period. If no response is received for a preset number of consecutive times, a primary network outage warning is triggered. The data transmission timeout threshold can be configured differently according to service priority, and a network interruption is confirmed when a timeout is triggered.

6. The centralized controller gateway supporting resume transmission after network outage as described in claim 1, characterized in that: The network disconnection buffer unit determines the basic segment length based on the latency jitter feature value in the fingerprint of the most recent communication state, and the latency jitter and the basic segment length have a negative correlation. The data verification granularity was adjusted based on the packet loss rate statistics before the network outage, and the packet loss rate and verification granularity showed a positive correlation and fit. The basic segment length is preset with a default value based on the business data type, and the verification granularity is preset with a default verification information ratio based on the business data type.

7. The centralized controller gateway supporting resume transmission after network outage as described in claim 1, characterized in that: The network disconnection caching unit pre-constructs a causal coupling model between the control command stream and the business data stream, clarifying the mapping relationship between the control command and the corresponding triggered data stream; The cache synchronously stores the original content of the business data stream and the complete context state of the corresponding control instructions. The control context state includes the instruction type, execution time, parameter configuration, and execution result feedback information. The associated marker includes a unique identifier for the control instruction, a timestamp for data segmentation and a sequence number, which, together with the verification information and segmentation identifier, constitute a complete cached data unit.

8. The centralized controller gateway supporting resume transmission after network outage according to claim 1, characterized in that, The resume recovery unit includes the following steps: The network recovery status is detected by link quality probe frames. When a preset number of valid responses are received consecutively, and the response latency and packet error rate both meet preset conditions, the network is determined to be recovered. After the network is restored, the central controller gateway exchanges the most recent communication status fingerprint with the terminal device and performs a consistency check. If there is a discrepancy, the status fingerprint stored on the central controller shall prevail.

9. The centralized controller gateway supporting resume transmission after network outage as described in claim 1, characterized in that: The resume recovery unit dynamically adjusts the data retransmission timeout threshold based on the ACK round-trip rhythm characteristics in the communication status fingerprint. The order of data reassembly should be determined based on business priority and data integrity status. Based on the characteristics of packet loss patterns, the packet loss probability of each data segment is predicted, and a differentiated retransmission strategy is adopted for segments with different packet loss probabilities. The validity of the control command context is verified by using a causal coupling model, a temporal correlation graph is constructed to adjust the data replay order, and a semantic consistency verification formula is used to quantify the verification results to ensure the logical consistency and integrity of the continued data transmission.

10. A method for restoring centralized controller data cache that supports resumed data transmission after network outage, characterized in that, Applied to a centralized controller gateway that supports resume transmission after network outage as described in any one of claims 1-9, the method includes the following steps: S1. During the normal communication phase between the centralized controller and the terminal equipment, extract the implicit features of the communication link in real time and construct a communication status fingerprint. S2. When a network interruption is detected, the data cache segment boundaries and verification granularity are dynamically divided based on the most recently generated communication state fingerprint. At the same time, the business data stream and the corresponding control context state are cached, and the control command sequence and data generation sequence are associated and marked. S3. When network recovery is detected, the data reassembly order and retransmission strategy are guided according to the communication status fingerprint. At the same time, semantic consistency verification and replay order adjustment are performed based on the coupling relationship between control commands and data streams to achieve network interruption resumption.

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