Industrial Internet of Things communication method based on time division

Abstract

The invention discloses an industrial Internet of Things communication method based on time division. The method comprises the following steps: connecting a main node and a sub-node in an industrial Internet of Things by adopting a single cable; the main node allocates time slots of data transmission and power transmission of each child node at intervals based on a time division technology; each child node performs data transmission and power transmission with the main node in a specified time window according to the time slot; when data transmission is carried out between each child node and the main node, an encoding mode is Manchester encoding, and an adopted communication protocol is a Modbus protocol. According to the invention, data transmission and power transmission in the industrial Internet of Things are integrated in a single cable based on a time division technology, and Manchester encoding and a Modbus protocol are combined, so that the wiring is simplified, the cost is reduced, the line utilization rate is improved, and the communication reliability and high efficiency are ensured.

Description

Technical Field

[0001] The present application relates to the field of Internet of Things communication technology, and in particular to an industrial Internet of Things communication method based on time division. Background Art

[0002] The Industrial Internet of Things (IIoT) plays a vital role in modern industrial systems. By connecting various industrial equipment and sensors to the Internet, data collection, transmission and processing can be achieved, thus improving the level of industrial automation and production efficiency. At present, the IIoT systems with high requirements for transmission rate and reliability mainly rely on multi-line wiring for communication. Although this method is reliable, it has problems such as complex wiring, high cost and low line utilization in practical applications. With the continuous development of the Industrial Internet of Things, there is an urgent need for a new communication method that simplifies wiring, reduces costs and ensures communication reliability.

[0003] In the prior art, Chinese patent CN112135297A discloses a communication method, central server, device and medium of the Internet of Things, the method comprising: receiving request data sent by a terminal node; the request data comprising label information of the terminal node; determining a first management node with the shortest distance to the terminal node among multiple management nodes according to the request data; sending the request data to the first management node, so that the first management node generates an IP relationship correspondence table between the terminal node and the first management node based on the request data, and completes the communication between the terminal node and the first management node, and the IP relationship correspondence table is stored in a blockchain node.

[0004] However, the above-mentioned prior art does not study or solve the problems of complex wiring, high cost and low line utilization of multi-line wiring in industrial Internet of Things wired communication. Summary of the invention

[0005] The present application provides an industrial Internet of Things communication method based on time division, which is used to solve the problems of complex wiring, high cost and low line utilization rate of multi-line wiring methods in the prior art.

[0006] On the one hand, the present application provides an industrial Internet of Things communication method based on time division, comprising the following steps:

[0007] Step 1: Use a single cable to connect the main node and sub-nodes in the industrial Internet of Things.

[0008] Step 2: The master node allocates time slots for data transmission and power transmission to each sub-node based on time division technology.

[0009] Step three, each sub-node transmits data and power to the master node respectively within a specified time window according to the time slot.

[0010] In step three, the encoding method used by each child node and the master node during data transmission is Manchester encoding.

[0011] In step three, the communication protocol used by each sub-node and the master node during data transmission is the Modbus protocol.

[0012] In a possible implementation, in step 3, the power transmission includes:

[0013] Each sub-node receives and stores the electric energy transmitted by the master node within a time window corresponding to the power transmission according to the time slot.

[0014] In a possible implementation, in step three, when each child node and the master node are performing data transmission, a data retransmission mechanism is introduced to resend the data in case of an error in the transmitted data.

[0015] In a possible implementation, in step three, each child node and the master node also combine data verification technology and data error correction technology with the data retransmission mechanism when performing data transmission.

[0016] In a possible implementation, the data verification technology includes: parity check technology, check technology, longitudinal redundancy check technology, Gray code check technology and cyclic redundancy check technology.

[0017] In a possible implementation, the data error correction technology includes: forward error correction technology, retransmission error correction technology and hybrid error correction technology.

[0018] In a possible implementation, in step three, each child node and the master node also use a lightweight encryption algorithm to encrypt the transmitted data during data transmission.

[0019] In a possible implementation, in step three, when each sub-node and the master node perform data transmission, a key-based identity authentication mechanism is introduced to perform device identity authentication.

[0020] An industrial Internet of Things communication method based on time division in this application has the following advantages:

[0021] By integrating the data transmission and power transmission in the industrial Internet of Things into a single cable based on time-slicing technology, and combining Manchester coding and Modbus protocol, the communication reliability and efficiency are ensured while simplifying wiring, reducing costs, and improving line utilization. Among them, Manchester coding is used to improve the anti-interference ability and synchronization performance of data transmission, the Modbus protocol is used to ensure communication reliability and ease of use, and the time-slicing technology is used to reasonably allocate the time slots for data transmission and power transmission, thereby improving the reliability of equipment operation.

[0022] Each proposed sub-node receives and stores the electric energy transmitted by the main node within the time window corresponding to the power transmission according to the time slot, thus ensuring the normal operation of the equipment.

[0023] By introducing a data retransmission mechanism to resend data when errors occur in transmitted data, communication reliability is improved; by combining data verification technology and data error correction technology with the data retransmission mechanism, the reliability and security of communication are further ensured.

[0024] The proposed lightweight encryption algorithm is used to encrypt the transmitted data, ensuring the confidentiality of data transmission.

[0025] The proposed introduction of a key-based authentication mechanism for device authentication prevents unauthorized device access and ensures the security of the industrial Internet of Things system. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 A schematic flow chart of an industrial Internet of Things communication method based on time division provided in an embodiment of the present application. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0029] like Figure 1 As shown, the embodiment of the present application provides an industrial Internet of Things communication method based on time division, comprising the following steps:

[0030] Step 1: Use a single cable to connect the main node and sub-nodes in the industrial Internet of Things.

[0031] Step 2: The master node allocates time slots for data transmission and power transmission to each sub-node based on time division technology.

[0032] Step three, each sub-node transmits data and power to the master node respectively within a specified time window according to the time slot.

[0033] In step three, the encoding method used by each child node and the master node during data transmission is Manchester encoding.

[0034] In step three, the communication protocol used by each sub-node and the master node during data transmission is the Modbus protocol.

[0035] Specifically, in this embodiment, a single high temperature resistant and anti-interference twisted pair is used to connect the master node and the sub-node in the industrial Internet of Things. The master node allocates the time slots for data transmission and power transmission of each sub-node based on the time division technology, thereby realizing the integration and common ground of data transmission and power transmission. After allocating the time slots for data transmission and power transmission, before data transmission and power transmission, the master node also sends a synchronous clock signal to each sub-node to synchronize the clocks of each sub-node.

[0036] Exemplarily, in step three, the power transmission includes:

[0037] Each sub-node receives and stores the electric energy transmitted by the master node within a time window corresponding to the power transmission according to the time slot.

[0038] Specifically, in this embodiment, each sub-node is provided with a power management module. In the time window corresponding to power transmission, the main node transmits a stable DC voltage through a single cable between each sub-node, and the power management module inside the sub-node stores the electrical energy in a battery or capacitor.

[0039] Exemplarily, in step three, when each child node and the master node are performing data transmission, a data retransmission mechanism is introduced to resend the data in case of an error in the transmitted data.

[0040] Specifically, the data retransmission mechanism is a mechanism in which, when the receiving end detects an error during data transmission, the sending end is requested to retransmit the data. This mechanism can ensure the integrity of the data, thereby improving the reliability of communication.

[0041] Exemplarily, in step three, each child node and the master node also combine data verification technology and data error correction technology with the data retransmission mechanism when performing data transmission.

[0042] Specifically, in this embodiment, the data transmission process that combines data verification technology and data error correction technology with a data retransmission mechanism is as follows: at the data sending end (main node or child node), the data is verified, a verification code is generated and added to the data, and then data error correction encoding is performed, an error correction code is added, and then the data is sent to the data receiving end (child node or main node); at the data receiving end, the received data is firstly subjected to data error correction decoding to attempt to correct the error, and then the verification code is used to detect the error; if an error is still detected using the verification code after the error is corrected, the data retransmission mechanism is triggered, the data receiving end sends a retransmission request to the data sending end, and the data sending end resends the data to the data receiving end.

[0043] Exemplarily, the data verification technology includes: parity check technology, check technology, longitudinal redundancy check technology, Gray code check technology and cyclic redundancy check technology.

[0044] Specifically, in this embodiment, a cyclic redundancy check technology is used as a data verification technology during data transmission.

[0045] Exemplarily, the data error correction technology includes: forward error correction technology, retransmission error correction technology and hybrid error correction technology.

[0046] Specifically, in this embodiment, forward error correction technology is used as the data error correction technology during data transmission.

[0047] Exemplarily, in step three, each child node and the master node also use a lightweight encryption algorithm to encrypt the transmitted data when transmitting data.

[0048] Specifically, in this embodiment, a 128-bit symmetric encryption algorithm (AES-128) is used to encrypt the transmitted data.

[0049] Exemplarily, in step three, when each child node and the master node are performing data transmission, a key-based identity authentication mechanism is introduced to perform device identity authentication.

[0050] Specifically, in this embodiment, the implementation process of the key-based identity authentication mechanism is as follows: generate respective key pairs, including public keys and private keys, on the master node and each child node respectively; the master node sends its public key to each child node, and each child node also sends its public key to the master node; when the master node needs to transmit data with a child node, the master node sends a timestamp to the corresponding child node; after receiving the timestamp, the corresponding child node uses the key pair shared with the master node (that is, the public key of the master node and the private key of the child node) to encrypt the timestamp, and sends the encrypted timestamp back to the master node as a response; after receiving the response, the master node uses its own private key and the public key of the corresponding child node to decrypt the response, and verifies whether the decrypted content matches the originally sent timestamp; if they match, the identity authentication is successful and subsequent data transmission can be carried out; if they do not match, the identity authentication fails, indicating that an unauthorized device has accessed and subsequent data transmission will not be carried out.

[0051] The embodiment of the present application integrates data transmission and power transmission in the industrial Internet of Things into a single cable based on time division technology, and combines Manchester coding and Modbus protocol to simplify wiring, reduce costs, and improve line utilization, while ensuring communication reliability and efficiency; among them, Manchester coding is used to improve the anti-interference ability and synchronization performance of data transmission, the Modbus protocol is used to ensure communication reliability and ease of use, and the time division technology is used to reasonably allocate time slots for data transmission and power transmission, thereby improving the reliability of equipment operation.

[0052] Each proposed sub-node receives and stores the electric energy transmitted by the main node within the time window corresponding to the power transmission according to the time slot, thus ensuring the normal operation of the equipment.

[0053] By introducing a data retransmission mechanism to resend data when errors occur in transmitted data, communication reliability is improved; by combining data verification technology and data error correction technology with the data retransmission mechanism, the reliability and security of communication are further ensured.

[0054] The proposed lightweight encryption algorithm is used to encrypt the transmitted data, ensuring the confidentiality of data transmission.

[0055] The proposed introduction of a key-based authentication mechanism for device authentication prevents unauthorized device access and ensures the security of the industrial Internet of Things system.

[0056] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0057] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. An industrial Internet of Things communication method based on time division, characterized in that: The following steps are involved: Step 1: Use a single cable to connect the master node and sub-nodes in the industrial Internet of Things; Step 2: the master node allocates time slots for data transmission and power transmission to each sub-node based on time division technology; Step 3, each sub-node performs data transmission and power transmission with the master node respectively within a specified time window according to the time slot; In step 3, the encoding method used by each child node and the master node during data transmission is Manchester encoding; In step three, the communication protocol used by each sub-node and the master node during data transmission is the Modbus protocol.

2. According to the time-segmentation-based industrial Internet of Things communication method of claim 1, it is characterized in that: In step three, the power transmission includes: Each sub-node receives and stores the electric energy transmitted by the master node within a time window corresponding to the power transmission according to the time slot.

3. According to the time-segmentation-based industrial Internet of Things communication method of claim 1, it is characterized in that: In step three, when each child node and the master node are performing data transmission, a data retransmission mechanism is introduced to resend the data in case of an error in the transmitted data.

4. The time-segmentation-based industrial Internet of Things communication method according to claim 3, characterized in that: In step three, each child node and the master node also combine data verification technology and data error correction technology with the data retransmission mechanism when performing data transmission.

5. The time-segmentation-based industrial Internet of Things communication method according to claim 4, characterized in that: The data verification technology includes: parity verification technology, verification technology, longitudinal redundancy verification technology, Gray code verification technology and cyclic redundancy verification technology.

6. The time-segmentation-based industrial Internet of Things communication method according to claim 4, characterized in that: The data error correction technology includes: forward error correction technology, retransmission error correction technology and hybrid error correction technology.

7. The time-segmentation-based industrial Internet of Things communication method according to claim 1, characterized in that: In step three, each child node and the master node also use a lightweight encryption algorithm to encrypt the transmitted data during data transmission.

8. The time-segmentation-based industrial Internet of Things communication method according to claim 1, characterized in that: In step three, when each sub-node and the master node are performing data transmission, a key-based identity authentication mechanism is introduced to perform device identity authentication.

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