CN114244472B - Industrial automatic fountain code data transmission device and method - Google Patents
Industrial automatic fountain code data transmission device and method Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
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- H—ELECTRICITY
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- H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
- H03M13/37—Decoding methods or techniques, not specific to the particular type of coding provided for in groups H03M13/03 - H03M13/35
- H03M13/3761—Decoding methods or techniques, not specific to the particular type of coding provided for in groups H03M13/03 - H03M13/35 using code combining, i.e. using combining of codeword portions which may have been transmitted separately, e.g. Digital Fountain codes, Raptor codes or Luby Transform [LT] codes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0072—Error control for data other than payload data, e.g. control data
- H04L1/0073—Special arrangements for feedback channel
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
Abstract
The invention discloses an industrial automatic fountain code data transmission device, which relates to the technical field of industrial automation, and comprises a controller module, a control module and a control module, wherein the controller module generates a control instruction and encapsulates the control instruction into an Ethernet frame; the fountain code coding module is used for setting coding parameters and coding control instructions; the multi-path management module is used for carrying out network transmission on the data; and the equipment end module receives the data and decodes and executes the data. The invention also discloses an industrial automatic fountain code data transmission method, which comprises the steps of S1100, generating a control instruction; s1200, setting coding parameters; s1300, fountain code coding; s1400, carrying out network transmission on the data; s1500, receiving data and decoding and executing; s1600, link state information feedback and sensor data feedback. The invention can meet the reliability requirement of industrial control data transmission by adaptively adjusting the coding parameters, thereby improving the reliability of data transmission and ensuring the safety of data transmission.
Description
Technical Field
The invention relates to the technical field of industrial automation, in particular to an industrial automation fountain code data transmission device and method.
Background
In recent years, with rapid development and application of new generation technologies such as cloud computing, internet of things, big data, mobile internet and the like, the digitalized and intelligent transformation of enterprises enters the industrial internet era. The manufacturing resources and the capabilities of the physical world can be fully interconnected and communicated with the information world, and the on-demand dynamic sharing and collaboration of the social manufacturing resources and the capabilities of distributed and heterogeneous enterprises can be supported in a service form, so that the method has become the development trend and the aim of a manufacturing collaboration mode. The key to intelligent manufacturing is to realize the intelligentization of the manufacturing process, which requires the deep fusion and cooperation of the artificial intelligence technology and the control system, management system and physical resources of the manufacturing process. In an industrial internet system architecture under intelligent manufacturing, a network is used as an infrastructure, all personnel, equipment, materials and the like in a factory are connected, and full flow and integration of various industrial data are promoted.
A large number of data transmission technologies already exist in the industrial control field, and wired transmission includes field bus technology, real-time ethernet technology, time-sensitive network technology and the like, and common protocols include PROFINET, POWERLINK, etherCAT, ethernet/IP, modbus-TCP and the like; wireless transmissions include Zigbee, bluetooth, wi-Fi, industrial wireless technology, 4G, 5G, and the like. In the industrial internet, various industrial devices such as controllers, actuators, sensors and the like need to be interconnected and cooperatively work, and solutions based on the protocols are different from hardware interfaces to software, so that the interconnection and the intercommunication cannot be realized. Meanwhile, the protocols have no universal safe and reliable transmission mechanism so as to meet the QoS (Quality of Service ) requirements of different services in the industrial control field.
In order to meet the requirements of reliability and real-time performance in industrial scenes, the traditional methods focus on improving communication function modules, such as technologies of L1 enhancement, rank 1-multiple input multiple output (Rank 1), multi-TRP (Multi-transmission reception point), and the like, which are extremely dependent on hardware equipment at the bottom of communication and are difficult to configure and lack versatility. Meanwhile, the requirements of increasingly severe reliability in industrial control data transmission are hardly met by only relying on the communication functional modules and hardware equipment. The coding technology is utilized to carry out coding transmission on the control instruction generated by the application function module, so that the reliability of data transmission can be improved, the difference of bottom equipment can be shielded, and the universality of the technical scheme is improved. Forward error correction (Forward Error Correction, FEC) and forward error correction codes are widely used coding techniques, common forward error correction codes include Turbo codes, low density parity check (LowDensityParityCheck, LDPC) codes, polar codes, and the like. However, these coding techniques all belong to coding modes that determine a good code rate before data transmission, do not react timely to a rapidly changing channel, and need to feed back retransmission information frequently, so that the requirements of deterministic traffic cannot be fully satisfied.
A heuristic algorithm is adopted in the self-adaptive RaptrQ coding to improve the reliability of LTE communication of the power distribution network, the RaptrQ coding parameters are dynamically adjusted according to packet loss rate and throughput feedback, and the suboptimal RaptrQ redundant coding length is solved. However, the disadvantage is that the coding scheme is optimized only for the LTE communication of the distribution network, rather than a generic scheme, which cannot meet more traffic demands. While the scheme lacks a joint design of coding based on channel feedback. Patent CN201410796826.3 proposes a multipath parallel reliable transmission method suitable for satellite networks, which calculates the number of multipaths N required according to the network load, and allocates the transmission data on each transmission path using bandwidth and reliability constraints. However, the disadvantage is that the number of multipaths N is not given, and that it is impossible to detect multipaths, and it is impossible to ensure that the communications meet the reliability requirements.
Accordingly, those skilled in the art have been working to develop an industrial automation fountain code data transmission device and method.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the technical problem to be solved by the present invention is how to improve the reliability and safety of industrial control data transmission, reduce the communication delay to a certain extent, and meet the communication requirements of various services in the industrial field, especially the low-delay and high-reliability deterministic services.
The inventor analyzes that the non-rate coding technology is used as a coding mode with an unfixed code rate, and can dynamically adjust coding parameters, so that the quick change of a channel is adapted, and the requirement of deterministic service when the state of the channel is changed quickly can be met. Common rateless coding techniques are LT codes, raptorQ codes, etc. In the fountain code coding transmission process, a transmitting end encodes and transmits source data by using fountain codes, a receiving end can decode the source data as long as receiving enough coding packets, and at the moment, the receiving end transmits a termination signal to the transmitting end to finish data transmission. The fountain code coding transmission flow greatly reduces the establishment of a feedback link and improves the transmission efficiency. Meanwhile, as the data transmitted by the existing industrial network are all transmitted in the clear text, when the industrial network is penetrated by the network, the industrial data are very easy to eavesdrop, the data transmission lacks the intrinsic safety, and the application of the coding technology can also ensure the safety of the data transmission to a certain extent.
Based on the lack of a generalized safe and reliable data transmission mechanism in the current industrial control field, the inventor establishes a set of generalized industrial control field communication device and method by utilizing fountain code coding technology and combining multi-path transmission technology, so as to improve the reliability and safety of industrial control data transmission, reduce communication time delay to a certain extent, and meet the communication requirements of various services in the industrial field, in particular to low-time-delay and high-reliability deterministic services. The inventor proposes an application layer coding and fountain code technology, fountain code coding is carried out on control instructions of an industrial control system, single-path or multi-path data transmission is realized by utilizing a network, the coded control instructions are received by equipment, the original control instructions are restored through a decoder, and the original control instructions are sent to an executor to be executed, so that the whole feedback control flow is completed.
In one embodiment of the present invention, there is provided an industrial automation fountain code data transmission device, including:
the controller module generates a control instruction and encapsulates the control instruction into an Ethernet frame;
the fountain code coding module is used for setting coding parameters and coding control instructions;
the multi-path management module is used for carrying out network transmission on the data;
the equipment end module receives data and decodes and executes the data;
the fountain code coding module is used for adaptively adjusting coding parameters according to the link state of the transmission path fed back by the multipath management module, selecting a fountain code data transmission mode, and transmitting the coding parameters to the equipment end module through a network; the fountain code coding module and the multipath management module are connected with the equipment end module through a network; the controller module receives the information fed back by the equipment end module, generates a control instruction according to a control algorithm, and transmits the control instruction to the fountain code coding module and the multipath management module.
Optionally, in the industrial automatic fountain code data transmission device in the foregoing embodiment, fountain code coding module parameters and multipath management module parameters are configurable.
Optionally, in the industrial automatic fountain code data transmission device in any one of the foregoing embodiments, the fountain code data transmission mode includes a single-path transmission mode and a multi-path transmission mode.
Further, in the industrial automatic fountain code data transmission device in the above embodiment, the single-path transmission mode only configures parameters of the fountain code coding module; the multipath transmission mode configures parameters of the fountain code coding module and the multipath management module at the same time.
Optionally, in the industrial automation fountain code data transmission device in any one of the foregoing embodiments, an implementation manner of the multipath transmission includes multiple socket binding, multiple physical network cards, and multiple virtual network cards.
Optionally, in the industrial automation fountain code data transmission device of any of the foregoing embodiments, the equipment-side module further includes a decoder, an actuator, and a sensor.
Further, in the industrial automatic fountain code data transmission device in the above embodiment, the decoder decodes the encoded information to obtain a control instruction, and inputs the control instruction to the actuator; responding to the control instruction, and executing corresponding actions by the executor; the sensor generates feedback data and communicates to the controller module.
Optionally, in the industrial automatic fountain code data transmission device in any one of the foregoing embodiments, the fountain code includes LT code, raptor code, raptorQ code, and BATS code.
Based on the industrial automatic fountain code data transmission device in the above embodiment, in another embodiment of the present invention, for a single-path transmission mode, an industrial automatic fountain code data transmission method is provided, which includes the following steps:
S1100, generating a control instruction, packaging the control instruction into an Ethernet frame, receiving sensor feedback in the equipment end module by the controller module, generating the control instruction through a control algorithm, and packaging the control instruction and the service type into the Ethernet frame. The Ethernet frame comprises a preamble, a frame start delimiter, a destination MAC (Media Access Control) address, a source MAC address, a frame type, data and frame verification, wherein the destination MAC address is a device end physical address, the source MAC address is a controller physical address, the frame type is a service type, and the data is a generated control instruction;
s1200, setting coding parameters, wherein a fountain code coding module sets the coding parameters according to control instructions and link state information, and the link state information comprises transmission rate, transmission delay and transmission error rate;
s1300, fountain code coding, wherein the fountain code coding module codes the fountain code for the control instruction according to the configured coding parameters;
s1400, carrying out network transmission on the data, writing the coding parameters and the coding data into a data part of the Ethernet frame, and carrying out network transmission on the Ethernet frame;
s1500, receiving data, decoding and executing, wherein the equipment end module receives the encoded data, decodes the encoded data by a decoder to obtain a control instruction, and sends the control instruction to an executor for executing;
S1600, link state information feedback and sensor data feedback, wherein the equipment end module detects the link state of a transmission path and feeds the link state information back to the fountain code coding module; meanwhile, the device-side module feeds back the sensor data to the controller module, and returns to step S1100.
Optionally, in the industrial automatic fountain code data transmission method in the foregoing embodiment, step S1200 further includes:
s1210, a fountain code coding module reads an Ethernet frame containing a control instruction, and judges the service type through frame type information to obtain corresponding time delay and reliability indexes, wherein the service type comprises deterministic service or nondeterminacy service;
s1220, configuring different coding parameters according to the time delay and the reliability index; a size including a code symbol size, a code overhead value; the overhead value is the redundant transmission number of the coding symbols obtained according to the reliability index, namely, when k (k is a positive integer) coding symbols need to be transmitted, k+overhead coding symbols are transmitted to meet the reliability index;
s1230, selecting the degree distribution functions of different fountain code codes and configuring corresponding parameters according to the link state information and the reliability index.
Further, in the industrial automatic fountain code data transmission method in the above embodiment, step S1300 further includes:
s1310, reading a data part in the Ethernet frame to obtain data with the size of x bytes, and dividing the data into k coding input symbols according to the configured coding symbol size. When the code symbol size is y bytes, k=ceil (y/x) is obtained. ceil () represents a round-up function;
s1320, carrying out fountain code coding on the k obtained input symbols according to the degree distribution function set in the step S1230 to generate k+coverage code symbols;
s1330, the code symbols are sequentially arranged and output to form code data.
Further, in the industrial automatic fountain code data transmission method in the above embodiment, the fountain code encoded degree distribution function includes ideal solitary wave distribution and robust solitary wave distribution, and the distribution functions are respectively:
ideal solitary wave distribution function:
where d represents the generated degree value and k represents the number of input symbols;
robust solitary wave distribution function:
wherein,
ρ (d) is an ideal solitary wave distribution function, τ (d) is a compensation optimization function, k is the number of input symbols, c is a constant greater than 0, v is the maximum decoding error probability allowed by the decoder, R is a value greater than 1 and less than k, and is derived from c, v and k, and β is a function normalization parameter.
Further, in the industrial automatic fountain code data transmission method in the above embodiment, step S1230 adaptively selects the degree distribution function of the fountain code by using the transmission link state obtained by feedback according to different reliability indexes, and modifies the parameters in the degree distribution function.
Optionally, in the industrial automatic fountain code data transmission method in the foregoing embodiment, step S1500 specifically includes:
s1510, the decoder reads the coding parameters as decoding parameters and reads all coding symbols;
the decoder decodes the code symbols through a belief propagation (Belief Propagation, BP) algorithm, which is a message passing algorithm that performs inference on the graph model, to obtain control instructions, which are passed to the executor for execution.
Based on the industrial automatic fountain code data transmission device in the above embodiment, in another embodiment of the present invention, for a multi-path transmission mode, an industrial automatic fountain code data transmission method is provided, which includes the following steps:
s2100, generating multiple groups of data, wherein the controller module receives sensor feedback in the equipment end module, and generates multiple groups of data comprising deterministic service data and non-deterministic service data by combining a control algorithm;
S2200, reading input data, determining the number N of multipaths (N is a positive integer greater than 1) by a multipath management module, and dynamically adjusting the transmission data size of each path according to the service to which the data belongs and the link state information of the multipaths;
s2300, setting coding parameters, namely transmitting data with different sizes to a fountain code coding module, and setting the coding parameters by combining link state information;
s2400, fountain code coding, namely, carrying out fountain code coding on data with different sizes according to coding parameters;
s2500, data transmission, namely selecting a corresponding transmission path for network transmission according to the service to which the data belongs by the data after fountain code coding;
s2600, receiving and executing data, wherein the equipment receives the data, decodes the data by a decoder and transmits the decoded data to an executor for execution;
s2700, link state information feedback and sensor data feedback, wherein the equipment end module detects the link states of N transmission paths and feeds the link state information back to the fountain code coding module and the multipath management module; meanwhile, the device-side module feeds back the sensor data to the controller module, and returns to step S2100.
Optionally, in the industrial automatic fountain code data transmission method in the foregoing embodiment, step S2200 specifically includes:
S2210, when the services to which the input data belong are consistent, namely deterministic service data or non-deterministic service data, dynamically distributing the transmission data size of each path according to the transmission rate, the transmission delay and the transmission error rate according to the link state information of multiple paths, and distributing more transmission data of the low-delay paths and less transmission data of the high-delay paths according to the proportional relation of the transmission delay or uniformly distributing data input to N paths for transmission;
s2220, when the services to which the input data belong are inconsistent, namely the partial deterministic service data and the partial non-deterministic service data, dividing N paths into a low-delay path and a general path according to the transmission delay according to the link state information of multiple paths, wherein the deterministic service data select the low-delay path for transmission, and the non-deterministic service data select the general path for transmission.
Optionally, in the industrial automatic fountain code data transmission method in the foregoing embodiment, step S2300 further includes:
s2310, a fountain code coding module reads an Ethernet frame containing a control instruction, and judges the service type through frame type information, so that corresponding time delay and reliability indexes are obtained, wherein the service type comprises deterministic service or nondeterminacy service;
S2320, configuring different coding parameters according to time delay and reliability indexes; a size including a code symbol size, a code overhead value; the overhead value is the redundant transmission number of the coding symbols obtained according to the reliability index, namely, when k (k is a positive integer) coding symbols need to be transmitted, k+overhead coding symbols are transmitted to meet the reliability index;
s2330, selecting the degree distribution functions of different fountain code codes according to the link state information and combining the reliability index, and configuring corresponding parameters.
Optionally, in the industrial automatic fountain code data transmission method in the foregoing embodiment, step S2400 specifically includes:
s2410, dividing the data into k input symbols according to the configured code symbol size. When the data size is x bytes and the code symbol size is y bytes, k=ceil (y/x) is obtained, wherein ceil () is an upward rounding function;
s2420, performing fountain code coding on the k obtained input symbols according to the degree distribution function set in the step S2330 to generate k+coverage code symbols;
s2430, sequentially arranging the code symbols and outputting the code symbols to form code data.
The fountain code is introduced as one application of the application function modules, and the generated control data is coded and transmitted by combining the data transmission link state information fed back by the communication function module, so that the joint design of the application function module and the communication function module is realized. The invention dynamically adjusts the transmission data size of each path in the multipath according to different services to which the data belongs and different link state information of a plurality of paths, and adaptively selects parameters in a fountain code degree distribution function and a modification degree distribution function according to the transmission error rate and other information of the paths. The invention can meet the reliability requirement of industrial control data transmission by adaptively adjusting the coding parameters, thereby improving the reliability of data transmission and ensuring the safety of data transmission.
The conception, specific structure, and technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, features, and effects of the present invention.
Drawings
Fig. 1 is a block diagram illustrating an industrial automation fountain code data transmission device according to an example embodiment;
fig. 2 is a flowchart illustrating an industrial automation fountain code data transmission method of a single path transmission mode according to an example embodiment;
fig. 3 is a flowchart illustrating an industrial automation fountain code data transmission method of a multi-path transmission mode according to an example embodiment.
Detailed Description
The following description of the preferred embodiments of the present invention refers to the accompanying drawings, which make the technical contents thereof more clear and easy to understand. The present invention may be embodied in many different forms of embodiments and the scope of the present invention is not limited to only the embodiments described herein.
In the drawings, like structural elements are referred to by like reference numerals and components having similar structure or function are referred to by like reference numerals. The dimensions and thickness of each component shown in the drawings are arbitrarily shown, and the present invention is not limited to the dimensions and thickness of each component. The thickness of the components is schematically and appropriately exaggerated in some places in the drawings for clarity of illustration.
The inventor designs an industrial automatic fountain code data transmission device, as shown in fig. 1, comprising:
the controller module generates a control instruction and encapsulates the control instruction into an Ethernet frame;
the fountain code coding module is used for setting coding parameters and coding control instructions;
the multi-path management module is used for carrying out network transmission on the data;
the equipment end module receives data and decodes and executes the data;
the fountain code coding module codes the control instruction, adaptively adjusts coding parameters according to the link state of the transmission path fed back by the multipath management module, selects a fountain code data transmission mode, and transmits the coding parameters to the equipment end module through a network; the fountain code coding module and the multipath management module are connected with the equipment end module through a network; the controller module receives the information fed back by the equipment end module, generates a control instruction according to a control algorithm, and transmits the control instruction to the fountain code coding module and the multipath management module. The fountain code coding module parameters and the multipath management module parameters are configurable; the fountain code data transmission mode comprises a single-path transmission mode and a multi-path transmission mode, wherein the single-path transmission mode only configures parameters of the fountain code coding module; the multipath transmission mode simultaneously configures parameters of the fountain code coding module and the multipath management module, and the multipath transmission mode comprises multi-socket binding, multi-physical network card and multi-virtual network card; the equipment end module also comprises a decoder, an executor and a sensor; the decoder decodes the encoded information to obtain a control instruction, and inputs the control instruction to the executor; responding to the control instruction, and executing corresponding actions by the executor; the sensor generates feedback data and transmits the feedback data to the controller module; fountain codes include LT codes, raptor codes, raptorQ codes, and BATS codes.
Based on the industrial automatic fountain code data transmission device in the above embodiment, in another embodiment of the present invention, for a single-path transmission mode, an industrial automatic fountain code data transmission method is provided, as shown in fig. 2, including the following steps:
s1100, generating a control instruction, packaging the control instruction into an Ethernet frame, receiving sensor feedback in the equipment end module by the controller module, generating the control instruction through a control algorithm, and packaging the control instruction and the service type into the Ethernet frame. The Ethernet frame comprises a preamble, a frame start delimiter, a destination MAC (Media Access Control) address, a source MAC address, a frame type, data and frame verification, wherein the destination MAC address is a device end address, the source MAC address is a controller address, the frame type is a service type, and the data is a generated control instruction;
s1200, setting coding parameters, wherein a fountain code coding module sets the coding parameters according to control instructions and link state information, and the link state information comprises transmission rate, transmission delay and transmission error rate; the method specifically comprises the following steps:
s1210, a fountain code coding module reads an Ethernet frame containing a control instruction, and judges the service type through frame type information to obtain corresponding time delay and reliability indexes, wherein the service type comprises deterministic service or nondeterminacy service;
S1220, configuring different coding parameters including the size of a coding symbol and the size of a coding overhead value according to the time delay and the reliability index; the overhead value is the number of redundant transmission of the coding symbols obtained according to the reliability index, that is, when k (k is a positive integer and is determined by the size of the control instruction data input and the size of the coding symbols) coding symbols need to be transmitted, k+overhead coding symbols are transmitted to meet the reliability index;
s1230, according to the link state information and the reliability index, selecting the degree distribution functions of different fountain code codes, configuring corresponding parameters, according to the different reliability indexes, using the feedback obtained transmission link state, self-adaptively selecting the degree distribution functions of the fountain code codes, and modifying the parameters in the degree distribution functions; the fountain code encoded degree distribution function comprises ideal solitary wave distribution and robust solitary wave distribution, and the distribution functions are respectively as follows:
ideal solitary wave distribution function:
where d represents the generated degree value and k represents the number of input symbols;
robust solitary wave distribution function:
wherein,
ρ (d) is an ideal solitary wave distribution function, τ (d) is a compensation optimization function, k is the number of input symbols, c is a constant greater than 0, v is the maximum decoding error probability allowed by the decoder, R is a value greater than 1 and less than k, and is derived from c, v and k, and β is a function normalization parameter.
S1300, fountain code coding, wherein the fountain code coding module codes the fountain code for the control instruction according to the configured coding parameters, and specifically comprises the following steps:
s1310, reading a data part in the Ethernet frame to obtain data with the size of x bytes, and dividing the data into k coding input symbols according to the configured coding symbol size. When the code symbol size is y bytes, k=ceil (y/x) is obtained. ceil () represents a round-up
A function;
s1320, carrying out fountain code coding on the k obtained input symbols according to the degree distribution function set in the step S1230 to generate k+coverage code symbols;
s1330, sequentially arranging the code symbols and outputting the code symbols to form code data;
s1400, carrying out network transmission on the data, writing the coding parameters and the coding data into a data part of the Ethernet frame, and carrying out network transmission on the Ethernet frame;
s1500, receiving data, decoding and executing, wherein the equipment end module receives the encoded data, decodes the encoded data by a decoder to obtain a control instruction, and sends the control instruction to an executor for executing; the method specifically comprises the following steps:
s1510, the decoder reads the coding parameters as decoding parameters and reads all coding symbols;
the decoder decodes the code symbols through a belief propagation (Belief Propagation, BP) algorithm, which is a message passing algorithm that performs inference on the graph model, to obtain control instructions, which are passed to the executor for execution.
S1600, link state information feedback and sensor data feedback, wherein the equipment end module detects the link state of a transmission path and feeds the link state information back to the fountain code coding module, and the link state information comprises a transmission rate, a transmission delay and a transmission error rate; meanwhile, the device-side module feeds back the sensor data to the controller module, and returns to step S1100.
Based on the industrial automation fountain code data transmission device in the above embodiment, in another embodiment of the present invention, for a multi-path transmission mode, a multi-physical network card is used as a multi-path implementation manner, and an industrial automation fountain code data transmission method is provided, as shown in fig. 3, including the following steps:
s2100, generating multiple groups of data, wherein the controller module receives sensor feedback in the equipment end module, and generates multiple groups of data comprising deterministic service data and non-deterministic service data by combining a control algorithm;
s2200, reading input data, wherein a multi-path management module reads the data input, determines the number N of multi-paths according to the number of physical network cards (N is a positive integer greater than 1), and dynamically adjusts the transmission data size of each path according to the service to which the data belongs and the link state information of the multi-paths; the method specifically comprises the following steps:
S2210, when the services to which the input data belong are consistent, namely deterministic service data or non-deterministic service data, dynamically distributing the transmission data size of each path according to the transmission rate, the transmission delay and the transmission error rate according to the link state information of multiple paths, and distributing more transmission data of the low-delay paths and less transmission data of the high-delay paths according to the proportional relation of the transmission delay or uniformly distributing data input to N paths for transmission;
s2220, when the services to which the input data belong are inconsistent, namely the partial deterministic service data and the partial non-deterministic service data, dividing N paths into a low-delay path and a general path according to the transmission delay according to the link state information of multiple paths, wherein the deterministic service data select the low-delay path for transmission, and the non-deterministic service data select the general path for transmission.
S2300, setting coding parameters, namely transmitting data with different sizes to a fountain code coding module, and setting the coding parameters by combining link state information, wherein the specific steps comprise:
s2310, a fountain code coding module reads an Ethernet frame containing a control instruction, and judges the service type through frame type information, so that corresponding time delay and reliability indexes are obtained, wherein the service type comprises deterministic service or nondeterminacy service;
S2320, configuring different coding parameters according to time delay and reliability indexes; a size including a code symbol size, a code overhead value; the overhead value is the redundant transmission number of the coding symbols obtained according to the reliability index, namely, when k (k is a positive integer) coding symbols need to be transmitted, k+overhead coding symbols are transmitted to meet the reliability index;
s2330, selecting the degree distribution functions of different fountain code codes according to the link state information and combining the reliability index, and configuring corresponding parameters.
S2400, fountain code coding, according to coding parameters, sequentially and respectively carrying out fountain code coding on data with different sizes according to transmission links, wherein the specific steps comprise:
s2410, dividing the data into k input symbols according to the configured code symbol size. When the data size is x bytes and the code symbol size is y bytes, k=ceil (y/x) is obtained, wherein ceil () is an upward rounding function;
s2420, performing fountain code coding on the k obtained input symbols according to the degree distribution function set in the step S2330 to generate k+coverage code symbols;
s2430, sequentially arranging the code symbols, and outputting the code symbols to form code data;
s2500, data transmission, namely selecting a corresponding transmission path for network transmission according to the service to which the data belongs by the data after fountain code coding;
S2600, receiving and executing data, wherein the equipment receives the data, decodes the data by a decoder and transmits the decoded data to an executor for execution;
s2700, link state information feedback and sensor data feedback, wherein the equipment end module detects the link states of N transmission paths and feeds the link state information back to the fountain code coding module and the multipath management module; meanwhile, the device-side module feeds back the sensor data to the controller module, and returns to step S2100.
The foregoing describes in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the invention by one of ordinary skill in the art without undue burden. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.
Claims (5)
1. An industrial automation fountain code data transmission device, which is characterized by comprising
The controller module generates a control instruction and encapsulates the control instruction into an Ethernet frame;
the fountain code coding module is used for setting coding parameters and coding control instructions, the fountain code data transmission mode comprises a single-path transmission mode and a multi-path transmission mode, and the single-path transmission mode only configures the parameters of the fountain code coding module; the multipath transmission mode configures parameters of the fountain code coding module and the multipath management module at the same time;
The multi-path management module is used for carrying out network transmission on the data;
the equipment end module receives data and decodes and executes the data;
the fountain code coding module adaptively adjusts coding parameters according to the link state of the transmission path fed back by the multipath management module, selects a fountain code data transmission mode, and the coding parameters reach the equipment end module through network transmission; the fountain code coding module and the multipath management module are connected with the equipment end module through a network; the controller module receives the information fed back by the equipment end module, generates a control instruction according to a control algorithm, and transmits the control instruction to the fountain code coding module and the multipath management module; the fountain code coding module parameters and the multipath management module parameters are configurable;
when the fountain code data transmission mode is a single-path transmission mode, the method comprises the following steps:
s1100, generating a control instruction, packaging the control instruction into an Ethernet frame, receiving sensor feedback in the equipment end module by the controller module, generating the control instruction according to a control algorithm, packaging the control instruction and a service type into the Ethernet frame, wherein the frame type is the service type, and the data is the generated control instruction;
S1200, setting coding parameters, wherein the fountain code coding module sets the coding parameters according to control instructions and link state information, and the link state information comprises transmission rate, transmission delay and transmission error rate; the method specifically comprises the following steps:
s1210, the fountain code coding module reads an Ethernet frame containing a control instruction, judges a service type through frame type information, and obtains corresponding time delay and reliability indexes, wherein the service type comprises deterministic service or nondeterministic service;
s1220, configuring different coding parameters according to the time delay and the reliability index; a size including a code symbol size, a code overhead value; the overhead value is the redundant transmission number of the coding symbols obtained according to the reliability index, namely, when k coding symbols need to be transmitted, k+overhead coding symbols are transmitted to meet the reliability index;
s1230, selecting the degree distribution functions of different fountain code codes and configuring corresponding parameters according to the link state information and combining the reliability indexes; the fountain code encoded degree distribution function comprises ideal solitary wave distribution and robust solitary wave distribution, and the distribution functions are respectively as follows:
ideal solitary wave distribution function:
Where d represents the generated degree value and k represents the number of input symbols;
robust solitary wave distribution function:
wherein,
ρ (d) is an ideal solitary wave distribution function, τ (d) is a compensation optimization function, k is the number of input symbols, c is a constant larger than 0, v is the maximum decoding error probability allowed by the decoder, R is a value larger than 1 and smaller than k, and is derived from c, v and k, and β is a function normalization parameter;
s1300, fountain code encoding, wherein the fountain code encoding module encodes the fountain code for the control instruction according to the configured encoding parameters; the method specifically comprises the following steps:
s1310, reading a data part in an Ethernet frame to obtain data with the size of x bytes, dividing the data into k coding input symbols according to the configured coding symbol size, and obtaining k=ceil (y/x) when the coding symbol size is y bytes;
s1320, carrying out fountain code coding on the k obtained input symbols according to the degree distribution function to generate k+coverage code symbols;
s1330, the code symbols are sequentially arranged and output to form code data;
s1400, carrying out network transmission on the data, writing the coding parameters and the coding data into a data part of an Ethernet frame, and carrying out network transmission on the Ethernet frame;
S1500, receiving data and decoding the data, wherein the equipment end module receives the encoded data, decodes the encoded data by a decoder to obtain a control instruction, and sends the control instruction to an executor for execution; the method specifically comprises the following steps:
s1510, the decoder reads the coding parameters as decoding parameters and reads all coding symbols;
s1520, the decoder decodes the code symbol through a belief propagation (Belief Propagation, BP) algorithm, so as to obtain a control instruction, and transmits the control instruction to an executor for execution, wherein the belief propagation algorithm is a message transmission algorithm for deducing on a graph model;
s1600, link state information feedback and sensor data feedback, wherein the equipment end module detects the link state of a transmission path and feeds back the link state information to the fountain code encoding module; meanwhile, the equipment end module feeds back the sensor data to the controller module, and the step S1100 is returned;
when the fountain code data transmission mode is a multipath transmission mode, the method comprises the following steps:
s2100, generating multiple groups of data, wherein the controller module receives feedback of the sensor in the equipment end module, and generates multiple groups of data comprising deterministic service data and non-deterministic service data by combining a control algorithm;
S2200, reading input data, wherein the multi-path management module reads the data input, determines the number N of multi-paths, and dynamically adjusts the transmission data size of each path according to the service to which the data belongs and the link state information of the multi-paths; the method specifically comprises the following steps:
s2210, when the services to which the input data belong are consistent, namely deterministic service data or nondeterministic service data, dynamically distributing the transmission data size of each path according to the transmission rate, the transmission delay and the transmission error rate according to the link state information of multiple paths, and distributing more transmission data of the low-delay paths and less transmission data of the high-delay paths according to the proportion relation of the transmission delay or uniformly distributing the input data to N paths for transmission;
s2220, when the services to which the input data belong are inconsistent, namely, part of the input data is deterministic service data and part of the input data is non-deterministic service data, dividing N paths into a low-delay path and a general path according to transmission delay according to the link state information of multiple paths, wherein the deterministic service data selects the low-delay path for transmission, and the non-deterministic service data selects the general path for transmission;
s2300, setting coding parameters, namely transmitting data with different sizes to the fountain code coding module, and setting the coding parameters by combining the link state information; the method specifically comprises the following steps:
S2310, the fountain code coding module reads an Ethernet frame containing a control instruction, and judges the service type through frame type information, so that corresponding time delay and reliability indexes are obtained, wherein the service type comprises deterministic service or nondeterministic service;
s2320, configuring different coding parameters according to time delay and reliability indexes; a size including a code symbol size, a code overhead value; the overhead value is the redundant transmission number of the coding symbols obtained according to the reliability index, namely when k coding symbols need to be transmitted, k is a positive integer, and k+overhead coding symbols are transmitted to meet the reliability index;
s2330, selecting the degree distribution functions of different fountain code codes according to the link state information and combining the reliability index, and configuring corresponding parameters;
s2400, fountain code coding, namely, carrying out fountain code coding on data with different sizes according to coding parameters; the method specifically comprises the following steps:
s2410, dividing data into k input symbols according to the configured size of the code symbol, and obtaining k=ceil (y/x) when the size of the data is x bytes and the size of the code symbol is y bytes, wherein ceil () is an upward rounding function;
s2420, performing fountain code encoding on the k obtained input symbols according to the degree distribution function set in the step S2330 to generate k+coverage code symbols;
S2430, sequentially arranging the code symbols, and outputting to form code data;
s2500, data transmission, namely selecting a corresponding transmission path for network transmission according to the service to which the data belongs by the data after fountain code coding;
s2600, receiving and executing data, wherein the equipment receives the data, decodes the data by the decoder and transmits the decoded data to the executor for execution;
s2700, link state information feedback and sensor data feedback, wherein the equipment end module detects the link states of N transmission paths and feeds back the link state information to the fountain code coding module and the multipath management module, and meanwhile, the equipment end module feeds back the sensor data to the controller module and returns to the step S2100.
2. The industrial automation fountain code data transmission device of claim 1, wherein the equipment-side module further comprises a decoder, an actuator, and a sensor.
3. The industrial automation fountain code data transmission device of claim 2, wherein the decoder decodes the encoded information to obtain control instructions, and inputs the control instructions to the actuator; responsive to the control instruction, the actuator performs a corresponding action; the sensor generates feedback data and communicates to the controller module.
4. An industrial automation fountain code data transmission method, characterized in that the industrial automation fountain code data transmission device according to claim 3 is used, the fountain code data transmission mode is a single-path transmission mode, and the method comprises the following steps:
s1100, generating a control instruction, packaging the control instruction into an Ethernet frame, receiving the feedback of the sensor in the equipment end module by the controller module, generating the control instruction according to a control algorithm, packaging the control instruction and a service type into the Ethernet frame, wherein the frame type is the service type, and the data is the generated control instruction;
s1200, setting coding parameters, wherein the fountain code coding module sets the coding parameters according to control instructions and link state information, and the link state information comprises transmission rate, transmission delay and transmission error rate; the method specifically comprises the following steps:
s1210, the fountain code coding module reads an Ethernet frame containing a control instruction, judges a service type through frame type information, and obtains corresponding time delay and reliability indexes, wherein the service type comprises deterministic service or nondeterministic service;
s1220, configuring different coding parameters according to the time delay and the reliability index; a size including a code symbol size, a code overhead value; the overhead value is the redundant transmission number of the coding symbols obtained according to the reliability index, namely, when k coding symbols need to be transmitted, k+overhead coding symbols are transmitted to meet the reliability index;
S1230, selecting the degree distribution functions of different fountain code codes and configuring corresponding parameters according to the link state information and combining the reliability indexes; the fountain code encoded degree distribution function comprises ideal solitary wave distribution and robust solitary wave distribution, and the distribution functions are respectively as follows:
ideal solitary wave distribution function:
where d represents the generated degree value and k represents the number of input symbols;
robust solitary wave distribution function:
wherein,
ρ (d) is an ideal solitary wave distribution function, τ (d) is a compensation optimization function, k is the number of input symbols, c is a constant larger than 0, v is the maximum decoding error probability allowed by the decoder, R is a value larger than 1 and smaller than k, and is derived from c, v and k, and β is a function normalization parameter;
s1300, fountain code encoding, wherein the fountain code encoding module encodes the fountain code for the control instruction according to the configured encoding parameters; the method specifically comprises the following steps:
s1310, reading a data part in an Ethernet frame to obtain data with the size of x bytes, dividing the data into k coding input symbols according to the configured coding symbol size, and obtaining k=ceil (y/x) when the coding symbol size is y bytes;
s1320, carrying out fountain code coding on the k obtained input symbols according to the degree distribution function to generate k+coverage code symbols;
S1330, the code symbols are sequentially arranged and output to form code data;
s1400, carrying out network transmission on the data, writing the coding parameters and the coding data into a data part of an Ethernet frame, and carrying out network transmission on the Ethernet frame;
s1500, receiving data, decoding and executing, wherein the equipment end module receives the encoded data, decodes the encoded data by the decoder to obtain a control instruction, and sends the control instruction to the executor for executing; the method specifically comprises the following steps:
s1510, the decoder reads the coding parameters as decoding parameters and reads all coding symbols;
s1520, the decoder decodes the code symbol through a belief propagation (Belief Propagation, BP) algorithm, so as to obtain a control instruction, and transmits the control instruction to an executor for execution, wherein the belief propagation algorithm is a message transmission algorithm for deducing on a graph model;
s1600, link state information feedback and sensor data feedback, wherein the equipment end module detects the link state of a transmission path and feeds back the link state information to the fountain code encoding module; meanwhile, the device-side module feeds back the sensor data to the controller module, and returns to step S1100.
5. An industrial automation fountain code data transmission method, characterized in that the industrial automation fountain code data transmission device according to claim 3 is used, the fountain code data transmission mode is a multipath transmission mode, and the method comprises the following steps:
S2100, generating multiple groups of data, wherein the controller module receives feedback of the sensor in the equipment end module, and generates multiple groups of data comprising deterministic service data and non-deterministic service data by combining a control algorithm;
s2200, reading input data, wherein the multi-path management module reads the data input, determines the number N of multi-paths, and dynamically adjusts the transmission data size of each path according to the service to which the data belongs and the link state information of the multi-paths; the method specifically comprises the following steps:
s2210, when the services to which the input data belong are consistent, namely deterministic service data or nondeterministic service data, dynamically distributing the transmission data size of each path according to the transmission rate, the transmission delay and the transmission error rate according to the link state information of multiple paths, and distributing more transmission data of the low-delay paths and less transmission data of the high-delay paths according to the proportion relation of the transmission delay or uniformly distributing the input data to N paths for transmission;
s2220, when the services to which the input data belong are inconsistent, namely, part of the input data is deterministic service data and part of the input data is non-deterministic service data, dividing N paths into a low-delay path and a general path according to transmission delay according to the link state information of multiple paths, wherein the deterministic service data selects the low-delay path for transmission, and the non-deterministic service data selects the general path for transmission;
S2300, setting coding parameters, namely transmitting data with different sizes to the fountain code coding module, and setting the coding parameters by combining the link state information; the method specifically comprises the following steps:
s2310, the fountain code coding module reads an Ethernet frame containing a control instruction, and judges the service type through frame type information, so that corresponding time delay and reliability indexes are obtained, wherein the service type comprises deterministic service or nondeterministic service;
s2320, configuring different coding parameters according to time delay and reliability indexes; a size including a code symbol size, a code overhead value; the overhead value is the redundant transmission number of the coding symbols obtained according to the reliability index, namely when k coding symbols need to be transmitted, k is a positive integer, and k+overhead coding symbols are transmitted to meet the reliability index;
s2330, selecting the degree distribution functions of different fountain code codes according to the link state information and combining the reliability index, and configuring corresponding parameters;
s2400, fountain code coding, namely, carrying out fountain code coding on data with different sizes according to coding parameters; the method specifically comprises the following steps:
s2410, dividing data into k input symbols according to the configured size of the code symbol, and obtaining k=ceil (y/x) when the size of the data is x bytes and the size of the code symbol is y bytes, wherein ceil () is an upward rounding function;
S2420, performing fountain code encoding on the k obtained input symbols according to the degree distribution function set in the step S2330 to generate k+coverage code symbols;
s2430, sequentially arranging the code symbols, and outputting to form code data;
s2500, data transmission, namely selecting a corresponding transmission path for network transmission according to the service to which the data belongs by the data after fountain code coding;
s2600, receiving and executing data, wherein the equipment receives the data, decodes the data by the decoder and transmits the decoded data to the executor for execution;
s2700, link state information feedback and sensor data feedback, wherein the equipment end module detects the link states of N transmission paths and feeds back the link state information to the fountain code coding module and the multipath management module, and meanwhile, the equipment end module feeds back the sensor data to the controller module and returns to the step S2100.
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