CN112689255B - A wireless sensor information monitoring system and method based on 6TiSCH - Google Patents

Abstract

The invention belongs to the field of wireless monitoring of industrial internet field data, and particularly relates to a wireless sensing information monitoring system and a method based on 6TiSCH, which comprises the following steps: the system comprises a sensor module, a 6TiSCH node module, a 6TiSCH routing module, a 6TiSCH gateway module and a terminal; the sensor module is used for acquiring data information; the 6TiSCH node module is used for acquiring data information, processing and transmitting data; the 6TiSCH routing module is used for managing network access and forwarding data of the 6TiSCH nodes in the corresponding range; the 6TiSCH gateway module is used for establishing a network topology and realizing data analysis and forwarding through network protocol analysis; the terminal is used for information processing and upper computer display; the invention can well utilize the wireless sensing information monitoring system based on the 6TiSCH to acquire the data of the industrial field equipment, and the certainty of the industrial internet wireless communication is improved by utilizing the 6TiSCH protocol stack.

Description

A wireless sensor information monitoring system and method based on 6TiSCH

technical field

The invention belongs to the field of industrial Internet field data wireless monitoring, in particular to a 6TiSCH-based wireless sensor information monitoring system and a method thereof.

Background technique

The collection and monitoring of key information is the foundation and key to the innovative application of intelligent manufacturing. Information monitoring based on wireless sensing has advantages in solving the complex wiring of the current wired network and poor deployment flexibility. However, it still faces high node power consumption and difficult reliability. guarantee and other limitations. With the continuous deepening of intelligent manufacturing scenarios, the industrial field environment has become complex and changeable, and the current demand for deterministic communication applications in industrial wireless networks has become increasingly prominent. Problems such as limited low-power communication.

In 2013, the IETF established the 6TiSCH (IPv6 over the TSCH mode of IEEE 802.15.4e, IPv6 network based on IEEE802.15.4e TSCH mode) working group. 6TiSCH communicates based on the IEEE 802.15.4e TSCH (timesynchronized channel hopping, time slot frequency hopping) access mode. Time synchronization technology balances the monitoring and idle time of adjacent devices to achieve low power consumption of field devices; frequency hopping technology avoids the same The interference on the channel improves the reliability of wireless data transmission and provides a capability close to wired transmission. However, due to the imperfect architecture of the existing 6TiSCH working group and the high complexity of the system, the address resources of the 6TiSCH protocol stack are wasted, the certainty of the wireless sensor network is poor, and the power consumption cannot be realized in the industrial field. To deploy IPv6 and other issues, there is an urgent need for a 6TiSCH wireless sensor information monitoring system that can implement IPv6 on-site deployment and reduce power consumption.

SUMMARY OF THE INVENTION

In order to solve the above problems existing in the prior art, the present invention proposes a wireless sensor information monitoring system based on 6TiSCH, the system includes: the system includes: a sensor module, a 6TiSCH node module, a 6TiSCH routing module, a 6TiSCH gateway module and terminal PC;

The sensor module is used to collect data information and transmit the data information to the 6TiSCH node module;

The 6TiSCH node module includes a 6TiSCH main control module, a radio frequency module, a storage module, and a power supply module;

The 6TiSCH main control module is used to coordinate and control the normal operation of the entire 6TiSCH node, and to read the data collected by the sensor module and the interaction information of the radio frequency module;

The radio frequency module is used to realize the channel frequency hopping and time synchronization functions of the 6TiSCH protocol, and realize the transmission and reception of wireless data under the control of the main control module;

The storage module is used to provide the memory required for the 6TiSCH main control module to perform calculation processing and the memory required for the radio frequency module to receive and transmit;

The power supply module is used to supply power to each sub-module in the 6TiSCH node module;

The 6TiSCH routing module is used to manage the network access of the 6TiSCH nodes within the corresponding range, and provides data forwarding from the 6TiSCH nodes to the 6TiSCH gateway;

6TiSCH gateway module is used to establish network topology, realize 6TiSCH wireless sensor network node access to IPv6 network, and perform network protocol analysis to realize data analysis and forwarding.

The terminal PC is connected with the 6TiSCH gateway for information processing and host computer display.

Preferably, the 6TiSCH main control module is the main control chip STM32, the main control chip STM32 reads the sensor module data through the peripheral interface, and exchanges information with the radio frequency module.

Preferably, the 6TiSCH routing module has the same structure as the 6TiSCH node module.

Preferably, the 6TiSCH gateway module includes a system module, a 6TiSCH control module, a radio frequency module, a storage module, and a network interface module;

Described system module adopts embedded Linux operating system, is used for managing 6TiSCH gateway process scheduling and CPU and memory allocation;

The 6TiSCH control module is electrically connected with the system module, and the system module reads the data uploaded to the 6TiSCH control module by the bottom layer according to the relevant executable files; the 6TiSCH control module and the radio frequency module of the 6TiSCH gateway module and the 6TiSCH main control module and The hardware structure of the radio frequency module is the same, and it is mainly used to broadcast the EB beacon frame to establish the network and receive the data uploaded by the node or route;

The storage module is used to provide the memory required for computing and processing by the embedded Linux operating system module and the 6TiSCH main control module, and is used to provide the memory required for the radio frequency module to receive and transmit;

The network interface module is used for Internet communication and PC-side communication.

A wireless sensor information monitoring method based on 6TiSCH, comprising: performing network configuration on a system; sensors acquiring data in real time; 6TiSCH nodes periodically reading data on sensors, and reporting the data to a 6TiSCH gateway; Perform analysis, and send the analysis results to the terminal PC for data processing and host computer display.

Preferably, the process of network configuration for the system includes: the 6TiSCH gateway periodically broadcasts the EB beacon frame; the 6TiSCH node and the 6TiSCH route monitor the EB beacon frame sent by the 6TiSCH gateway in real time, and initiate an association request to the 6TiSCH gateway; 6TiSCH gateway is 6TiSCH The node or 6TiSCH routing assigns a 16-bit short address and adds it to the neighbor table; when the 6TiSCH node is far away from the 6TiSCH gateway, the node can monitor the EB beacon frame broadcast by the 6TiSCH routing agent that is closer to the network, and complete the system configuration .

Preferably, the process of reading the sensor data by the 6TiSCH node includes: the 6TiSCH main control module sends an inquiry frame to the sensor, and the inquiry frame includes an address code, a function code, a starting address, a data length, and a check code; After the inquiry frame, reply the response frame, which includes the address code, function code, valid number of bytes, temperature and humidity value, and check code; the response frame data of the 6TiSCH node sensor is stored in the storage module and waiting for the RF module to forward.

Preferably, the 6TiSCH node uploads data in two ways according to the network topology in the process of reporting data to the 6TiSCH gateway; the uploading methods include that the 6TiSCH node directly reports the read data to the 6TiSCH gateway; the 6TiSCH node first reports the read data to the 6TiSCH routing , 6TiSCH routing organizes the data and reports it to the 6TiSCH gateway.

The beneficial effects of the present invention are as follows: the present invention can make good use of the wireless sensor information monitoring system based on 6TiSCH to obtain the data of industrial field equipment, use the 6TiSCH protocol stack to improve the certainty of wireless communication in the industrial Internet, and reduce the cost of wireless sensor networks. power consumption.

Description of drawings

1 is a schematic structural diagram of a wireless sensor information monitoring system based on 6TiSCH according to the present invention;

2 is a schematic diagram of a 6TiSCH node in the system composition of the present invention;

Fig. 3 is the schematic diagram of 6TiSCH routing in the system composition of the present invention;

FIG. 4 is a schematic diagram of a 6TiSCH gateway in the system composition of the present invention.

Detailed ways

The embodiments of the present invention are described below through specific specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the drawings provided in the following embodiments are only used to illustrate the basic idea of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

A wireless sensor information monitoring system based on 6TiSCH, as shown in Figure 1, the system includes: a sensor module, a 6TiSCH node module, a 6TiSCH routing module, a 6TiSCH gateway module and a terminal PC.

As shown in Figure 2, the 6TiSCH node module includes a 6TiSCH main control module, a radio frequency module, a storage module, and a power supply module; the 6TiSCH main control module is used to coordinate and control the normal operation of the entire 6TiSCH node, and to read the data collected by the sensor module and the radio frequency module. Exchange information; the radio frequency module is used to realize the channel frequency hopping and time synchronization functions of the 6TiSCH protocol. Channel frequency hopping generates frequency hopping channels according to channel offset, network absolute time slot number and the number of available channels, and time synchronization EB beacon frame, parse the time synchronization element, and obtain the absolute time slot number. The transmission and reception of wireless data is realized under the control of the main control module; the storage module is used to provide the memory required for the 6TiSCH main control module to perform calculation processing and the memory required for the radio frequency module to receive and send; the power module is used to Each sub-module in the 6TiSCH node module is powered.

Preferably, the 6TiSCH main control module adopts the main control chip STM32 as the control unit. The chip has the characteristics of high performance, low cost and low power consumption; using this chip as the 6TiSCH main control module can not only control the real-time different functions of each module, but also save costs and improve performance.

Preferably, the 6TiSCH main control module acquires the data of the sensor module through a peripheral interface, and is connected with the radio frequency module through the peripheral interface to realize information exchange.

Preferably, the working frequency of the radio frequency module of the present invention is 2.4 GHz, supports 16-channel operation, and is used to realize functions such as channel frequency hopping and time synchronization of the 6TiSCH protocol. Channel frequency hopping can avoid channel conflicts and improve the certainty of wireless communication. Time synchronization technology balances the monitoring and idle time of adjacent devices well, and realizes low power consumption of field devices.

As shown in Figure 3, the 6TiSCH routing module has the same hardware structure as the 6TiSCH node module, including the 6TiSCH main control module, radio frequency module, storage module, and power supply module. The functions of the routing module include: first, it can act as a network access agent for 6TiSCH nodes within a corresponding range; second, it provides data forwarding from 6TiSCH nodes to 6TiSCH gateways.

As shown in Figure 4, the 6TiSCH gateway module includes a system module, a 6TiSCH control module, a radio frequency module, a storage module, and a network interface module; the 6TiSCH gateway module is used to establish a network topology and realize that the 6TiSCH wireless sensor network node is connected to the IPv6 network. And perform network protocol analysis to realize data analysis and forwarding.

Optionally, the system module adopts an embedded Linux operating system for managing 6TiSCH gateway process scheduling and CPU and memory allocation.

Preferably, the embedded Linux operating system is electrically connected to the 6TiSCH control module, and the system can run relevant executable files to read the data uploaded to the 6TiSCH control module at the bottom layer.

Optionally, the relevant executable files include: a data reading program, a ping test program, an Opc UA server program, and the like.

Optionally, the 6TiSCH control module and the radio frequency module of the 6TiSCH gateway module have the same hardware structure as the 6TiSCH main control module and the radio frequency module on the 6TiSCH node module, and are mainly used to broadcast EB beacon frames to establish a network and receive data uploaded by nodes or routes.

Preferably, the storage module is used to provide the memory required for computing and processing by the embedded Linux operating system module and the 6TiSCH main control module, and is used to provide the memory required for the radio frequency module to receive and transmit.

Preferably, the network interface module is used to communicate with the Internet and the terminal PC, and to change or upgrade the version of the embedded Linux operating system.

6TiSCH gateway can provide more development, such as establishing OPC UA server or establishing message queue telemetry transmission MQTT client to upload data to the cloud.

A wireless sensor information monitoring method based on 6TiSCH, comprising: performing network configuration on a system; sensors acquiring data in real time; 6TiSCH nodes periodically reading data on sensors, and reporting the data to a 6TiSCH gateway; Perform analysis, and send the analysis results to the terminal PC for data processing and host computer display.

When the network configuration of the system is carried out, the related programs based on the 6TiSCH protocol stack are preferentially burned into the related equipment of the system. The 6TiSCH gateway connects the terminal PC and turns on all the equipment. The 6TiSCH gateway RF module periodically broadcasts EB beacon frames. After the 6TiSCH node and the router continue to monitor the 6TiSCH gateway EB beacon frame, an association request is initiated to the 6TiSCH gateway. The 6TiSCH gateway assigns a 16-bit short address to the node or routing device and adds it to the 6TiSCH gateway. Neighbor table, when the node is far away from the 6TiSCH gateway, the node can monitor the EB beacon frame broadcast by the 6TiSCH routing agent that is closer to the network, and the system completes the networking. The network structure is shown in Figure 1.

Preferably, the 6TiSCH node periodically sends data to the 6TiSCH route or the 6TiSCH gateway. The sending period here can be set according to the specific situation. The 6TiSCH main control module exchanges information with the radio frequency chip CY2420 through the hardware interface. The baseband/MAC processing unit of the chip can be The physical layer and MAC layer of IEEE802.15.4 provide hardware support, and its DLL processing unit design can provide direct hardware support for the data link layer core technology of mainstream wireless communication international standards, including channel frequency modulation mechanism, superframe scheduling engine and time frame. Gap communication mechanism and other functions. The system can independently complete time synchronization channel frequency hopping according to the configuration. Time synchronization is also periodically performed between adjacent devices, and data transmission between adjacent devices is completed through the 2.4GHz antenna of the radio frequency module.

Preferably, when the 6TiSCH node reads sensor data, the system uses a temperature and humidity sensor based on RS485 communication protocol communication. The data reading process is as follows: 6TiSCH main control module sends an inquiry frame to the sensor, and the inquiry frame includes address code, function code, Start address, data length, and check code. After receiving the inquiry frame, the sensor replies with a response frame. The response frame includes address code, function code, number of valid bytes, temperature and humidity values, and check code. So far, the 6TiSCH node has successfully read The sensor data is taken, and the data is stored in the storage module to be forwarded by the radio frequency module.

Preferably, the 6TiSCH route forwards data to the 6TiSCH gateway.

Preferably, the 6TiSCH gateway receives the data uploaded from the bottom layer. In the case of multi-node access, in order to reduce the bandwidth occupation, when the same node continuously uploads the same data, the uploading is stopped until the data is different and the uploading is resumed at the same time.

Preferably, the 6TiSCH gateway embedded operating system module adopts RT5350 chip to run the OpenWRT-15.05-release version system and is electrically connected to the 6TiSCH control module, and executes relevant programs to display the uploaded data.

The 6TiSCH gateway can provide more development, such as building an OPC UA server or building an MQTT client to upload data to the cloud.

6TiSCH gateway forwards data to Internet or terminal PC through network interface module.

Those of ordinary skill in the art can understand that all or part of the steps in the various methods of the above embodiments can be completed by instructing relevant hardware through a program, and the program can be stored in a computer-readable storage medium, and the storage medium can include: ROM , RAM, disk or CD, etc.

The above-mentioned embodiments further describe the purpose, technical solutions and advantages of the present invention in detail. It should be understood that the above-mentioned embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made to the present invention within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (6)

1. A wireless sensing information monitoring system based on 6TiSCH, which is characterized by comprising: the system comprises a sensor module, a 6TiSCH node module, a 6TiSCH routing module, a 6TiSCH gateway module and a terminal PC;

the sensor module is used for acquiring data information and transmitting the data information to the 6TiSCH node module;

the 6TiSCH node module comprises a 6TiSCH main control module, a radio frequency module, a storage module and a power supply module;

the 6TiSCH master control module is used for coordinating and controlling the normal work of the whole 6TiSCH node and reading data acquired by the sensor module and the interaction information of the radio frequency module; the 6TiSCH master control module is a master control chip STM32, and the master control chip STM32 reads data of the sensor module through a peripheral interface and performs information interaction with the radio frequency module; the 6TiSCH routing module and the 6TiSCH node module have the same structure;

the radio frequency module is used for realizing the channel frequency hopping and time synchronization functions of a 6TiSCH protocol and realizing the transmission and the reception of wireless data under the control of the main control module;

the storage module is used for providing a memory required by the 6TiSCH main control module for calculation processing and a memory required by the radio frequency module for receiving and sending;

the power supply module is used for supplying power to each sub-module in the 6TiSCH node module;

the 6TiSCH routing module is used for managing network access of 6TiSCH nodes in a corresponding range and providing data forwarding from the 6TiSCH nodes to a 6TiSCH gateway;

the 6TiSCH gateway module is used for establishing a network topology, realizing that the 6TiSCH wireless sensing network node is accessed to an IPv6 network, and carrying out network protocol analysis to realize data analysis and forwarding;

the 6TiSCH gateway module comprises a system module, a 6TiSCH control module, a radio frequency module, a storage module and a network interface module;

the system module is used for managing 6TiSCH gateway process scheduling and CPU and memory allocation;

the 6TiSCH control module is electrically connected with the system module, and the system module reads data uploaded to the 6TiSCH control module from the bottom layer according to the operation related executable file; the hardware structures of a 6TiSCH control module and a radio frequency module of the 6TiSCH gateway module and a 6TiSCH main control module and a radio frequency module of the 6TiSCH node module are the same, and the 6TiSCH main control module and the radio frequency module are mainly used for broadcasting EB beacon frames to establish a network and receiving data uploaded by nodes or routes;

the storage module is used for providing a memory required by the system module and the 6TiSCH main control module for calculation processing, and is used for providing a memory required by the radio frequency module for receiving and sending;

the network interface module is used for the communication of the Internet and the PC terminal;

and the terminal PC is connected with the 6TiSCH gateway and is used for information processing and upper computer display.

2. The system for monitoring the wireless sensing information based on the 6TiSCH of claim 1, wherein the system module adopts an embedded Linux operating system.

3. A wireless sensing information monitoring method based on 6TiSCH is characterized by comprising the following steps: the method is applied to the wireless sensing information monitoring system based on the 6TiSCH in claim 1; carrying out network configuration on the system; the sensor acquires data in real time; the 6TiSCH node periodically reads data on the sensor and reports the data to the 6TiSCH gateway; and the 6TiSCH gateway analyzes the data according to a network protocol, and sends an analysis result to the terminal PC for data processing and upper computer display.

4. The method for monitoring the wireless sensing information based on the 6TiSCH of claim 3, wherein the network configuration process of the system comprises the following steps: the 6TiSCH gateway periodically broadcasts EB beacon frames; the 6TiSCH node and the 6TiSCH route monitor EB beacon frames sent by the 6TiSCH gateway in real time and initiate an association request to the 6TiSCH gateway; the 6TiSCH gateway allocates a 16-bit short address for a 6TiSCH node or a 6TiSCH route and adds the address into a neighbor table; when the 6TiSCH node is far away from the 6TiSCH gateway, the node can monitor EB beacon frames broadcasted by the 6TiSCH routing agent which is near to the access network, and system configuration is completed.

5. The method for monitoring the wireless sensing information based on the 6TiSCH, according to claim 3, wherein the process of reading the sensor data by the 6TiSCH node comprises the following steps: the 6TiSCH master control module sends an inquiry frame to the sensor, wherein the inquiry frame comprises an address code, a function code, an initial address, a data length and a check code; the sensor replies a response frame after receiving the inquiry frame, wherein the response frame comprises an address code, a function code, effective byte number, a temperature and humidity value and a check code; and the response frame data of the 6TiSCH node sensor is stored in a storage module to wait for the forwarding of the radio frequency module.

6. The method for monitoring the wireless sensing information based on the 6TiSCH, according to claim 3, is characterized in that the 6TiSCH node uploads data in two modes according to a network topology structure in the process of reporting the data to the 6TiSCH gateway; the uploading mode comprises that the 6TiSCH node directly reports the read data to the 6TiSCH gateway; the 6TiSCH node reports the read data to a 6TiSCH route, and the 6TiSCH route sorts the data and reports the data to a 6TiSCH gateway.

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