CN110661846B - Ultra-narrow band power internet of things communication system and communication method thereof - Google Patents
Ultra-narrow band power internet of things communication system and communication method thereof Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave
- H04W52/0216—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave using a pre-established activity schedule, e.g. traffic indication frame
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
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Abstract
The invention provides an ultra-narrow band power internet of things communication system and a communication method thereof, wherein the system comprises the following components: a wireless gateway and a plurality of wireless node terminals wirelessly connected with the wireless gateway; the wireless gateway is connected to the electric power Internet of things platform through an electric power transmission network; the wireless gateway works in a special frequency band of electric power and is used for selecting unused frequency points in the special frequency band of electric power to construct communication connection between the wireless gateway and the wireless node terminal. Compared with the LPWAN systems such as LoRA, sigfox and the like which work in an unlicensed frequency band, the ultra-narrow band electric power Internet of things communication system is higher in transmitting power, is not easy to be interfered by other systems, is higher in signal penetrating capacity, wider in coverage range and application scene, and is more guaranteed in system reliability and safety, and suitable for electric power industrial application. Compared with a wireless private network, the system has the advantages of low engineering site selection and construction requirements, long communication distance, large connection quantity, low power consumption of terminal equipment, small data adaptation, low frequency adaptation and large connection of the power state monitoring Internet of things service.
Description
Technical Field
The invention belongs to the technical field of power communication, and particularly relates to an ultra-narrow band power internet of things communication system and a communication method thereof.
Background
The power grid equipment has the characteristics of large quantity, wide distribution range, complex operation environment and the like, and operation and maintenance are required to carry out remote monitoring on the operation state of the power distribution equipment. The power grid equipment and the line running state monitoring nodes have the characteristics of large quantity, wide distribution, small single-point data volume, low communication frequency, poor running environment, low power consumption and the like. The communication problems of wide coverage, long distance, large connection, low power consumption and the like need to be solved.
The communication technology of the Internet of things suitable for monitoring the state of power grid equipment comprises two main types: one type is a short-range wireless communication technology, and one type is a Low-Power Wide-Area Network (LPWAN) technology.
Short-distance wireless communication technology comprises WLAN, zigbee, bluetooth and the like, has the advantage of low power consumption, but the single-hop communication distance is usually less than 100 meters, and a complex multi-hop Mesh networking is required to expand the transmission range, so that the short-distance wireless communication technology is not suitable for a power distribution network covering a distance of several kilometers to tens of kilometers.
LPWAN is a communication technology facing application of internet of things, such as LoRA, sigfox, narrowband internet of things (NArrow Band-Internet of Things, NB-IoT) technology, etc. The low-power wide-area wireless communication technology has a single-hop communication distance of several kilometers, even tens of kilometers, tens of thousands of supported connections and lower power consumption (usually 3-10 years). The low-power consumption wide area wireless communication technology has been developed extremely rapidly since the proposal, wherein the NB-IoT technology adopts a telecom operator cellular communication mode, and the signals of areas such as remote mountain areas, urban underground areas and the like are not covered individually, so that the standby power consumption of the module is slightly large, the real-time performance of public network communication, the flow cost and other factors limit the application to the power grid scale; however, the LPWAN technologies such as LoRA and Sigfox have the problems of lack of legal frequency resources, difficulty in guaranteeing safety, easiness in interference in actual use and the like.
The electric power internet of things is an industrial internet of things with high requirements, and an electric power business with high reliability, safety and real-time requirements is borne by a private network of a general self-building industry of an electric power enterprise. Taking china as an example, the 230MHz radio frequency band is a frequency band allocated by the chinese radio management committee to private networks in industries such as energy power, water conservancy, oil gas, etc. The 230MHz frequency band refers to 223-235MHz, the total bandwidth is 12MHz, and 480 frequency points with the bandwidth of 25kHz are included. In terms of allocation, the China radio management committee allocates 280 frequency points to the power industry, and the total bandwidth is 7MHz, so that a power wireless private network is built to bear power communication service. The 230MHz power wireless private network is a narrow-band (25 kHz single-frequency point) two-way communication system, and mainly bears narrow-band data such as power grid load control, power acquisition and the like. The 230M wireless private network needs to build a special wireless base station, has high engineering site selection and construction requirements, high construction cost, high power consumption of terminal equipment, large volume, coverage blind area and other problems in signal coverage, and is not suitable for the state monitoring internet of things service with a large amount of low frequency and small data characteristics like temperature, switch state and the like.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides an ultra-narrow band power internet of things communication system, which is improved by comprising the following components:
a wireless gateway and a plurality of wireless node terminals wirelessly connected with the wireless gateway;
the wireless gateway is connected to the electric power internet of things platform through an electric power transmission network;
the wireless gateway works in a power dedicated frequency band and is used for selecting unused frequency points in the power dedicated frequency band to construct communication connection between the wireless gateway and the wireless node terminal.
The first preferred technical solution provided by the present invention is improved in that the wireless gateway includes: a transceiver subsystem and a control subsystem;
The receiving and transmitting subsystem is in wireless connection with the wireless node terminal and is also in wired connection with the power transmission network, and is used for receiving and transmitting signals between the wireless node terminal and the power internet of things platform;
The control subsystem is used for identifying unused frequency points in the power dedicated frequency band, distributing the frequency points to wireless node terminals in wireless connection with the wireless gateway, and performing registration management and communication protocol management on the wireless node terminals through the transceiver subsystem.
The second preferred technical scheme provided by the invention is improved in that the control subsystem comprises a protocol processing module, a wireless resource management module and a node registration management module;
The protocol processing module is used for processing a communication protocol between the transceiver subsystem and the wireless node terminal;
The node registration management module is used for registering and managing the wireless node terminal through the receiving and transmitting subsystem;
the wireless resource management module is used for cognizing the special frequency band of the electric power and distributing sub-channels connected with the wireless node terminal according to unused frequency points in the cognized special frequency band of the electric power.
The third preferred technical scheme provided by the invention is characterized in that the receiving and transmitting subsystem comprises a physical layer frame packaging module, a coding module, a modulation module and a radio frequency receiving and transmitting circuit module:
the physical layer frame packaging module is used for packaging signals between the wireless node terminal and the electric power internet of things platform in a physical layer;
the coding module is used for coding the signals packaged by the physical layer;
The modulation module is used for modulating the coded signal;
the radio frequency transceiver circuit module is used for receiving and transmitting the modulated signals.
The fourth preferred technical scheme provided by the invention is improved in that the width of the frequency point is 25kHz, and the width of the sub-channel is 200Hz.
The fifth preferred technical scheme provided by the invention is improved in that the signals between the wireless node terminal and the electric power internet of things platform comprise power grid load control commands and power consumption acquisition data.
Based on the same inventive concept, the invention also provides a communication method of the ultra-narrow band power internet of things communication system, which comprises the following steps:
connecting a wireless gateway in the ultra-narrow band power internet of things communication system to a power internet of things platform through a power transmission network;
adopting the wireless gateway to recognize unused frequency points in a special frequency band of electric power;
and selecting unused frequency points to construct wireless communication connection between the wireless gateway and the wireless node terminal.
The sixth preferred technical solution provided by the present invention is improved in that the adopting the unused frequency point in the wireless gateway cognitive power dedicated frequency band includes:
Adopting the wireless gateway to obtain unused frequency points in the special frequency band of the electric power by using an energy detection method or a cyclostationary characteristic detection method;
the frequency detection sequence in the energy detection method or the cyclostationary characteristic detection method comprises the following steps: sequential detection and random detection.
The seventh preferred technical solution provided by the present invention is improved in that after the application of the unused frequency point in the wireless gateway cognitive power dedicated frequency band and before the selection of the unused frequency point to construct wireless communication connection between the wireless gateway and the wireless node terminal, the seventh preferred technical solution further includes:
selecting a single or continuous plurality of unused frequency points to perform spectrum aggregation to obtain an operating frequency band of the ultra-narrow band power Internet of things communication system;
dividing sub-channels according to a preset bandwidth on the working frequency band;
and initializing a network according to the sub-channels, and entering a normal working mode.
The eighth preferred technical solution provided by the present invention is improved in that the selecting an unused frequency point to construct a wireless communication connection between a wireless gateway and a wireless node terminal, including:
The wireless gateway sets a broadcast channel based on the sub-channel and sends a beacon corresponding to the broadcast channel to the wireless node terminal;
The wireless gateway constructs wireless communication connection between the wireless gateway and the wireless node terminal according to the received reply of the wireless node terminal for the beacon;
The width of the frequency point is 25kHz, and the width of the sub-channel is 200Hz.
The ninth preferred technical solution provided by the present invention is improved in that the wireless gateway constructs a wireless communication connection between the wireless gateway and the wireless node terminal according to the received reply of the wireless node terminal to the beacon, and the method includes:
the wireless gateway allocates an address and a channel for the wireless node terminal according to the received reply of the wireless node terminal for the beacon, and sends a network access confirmation message to the wireless node terminal;
After receiving the network access confirmation message, the wireless node terminal configures the website of the wireless node terminal and adjusts the working frequency according to the address and the channel allocated by the wireless gateway, thereby completing the wireless communication connection between the wireless gateway and the wireless node terminal.
The tenth preferred technical solution provided by the present invention is an improvement, wherein after the connection with the wireless gateway is completed, the tenth preferred technical solution further includes:
when the wireless node terminal does not have a data transmission request, entering a sleep mode;
when the wireless node terminal has a data transmission request, completing data transmission;
Wherein the waking up of the sleep mode comprises: periodic wakeup and on-demand wakeup.
The eleventh preferred technical solution provided by the present invention is improved in that after the wireless communication connection between the wireless gateway and the wireless node terminal is established by selecting the unused frequency points, the method further includes:
The control subsystem of the wireless gateway is adopted, and registration management and communication protocol management are carried out on the wireless node terminal through the receiving and transmitting subsystem of the wireless gateway;
and adopting the receiving and transmitting subsystem to carry out signal transmission between the wireless node terminal and the electric power internet of things platform in a bidirectional manner.
Compared with the closest prior art, the invention has the following beneficial effects:
The communication system of the ultra-narrow band power Internet of things provided by the invention comprises the following components: a wireless gateway and a plurality of wireless node terminals wirelessly connected with the wireless gateway; the wireless gateway is connected to the electric power Internet of things platform through an electric power transmission network; the wireless gateway works in a special frequency band of electric power and is used for selecting unused frequency points in the special frequency band of electric power to construct communication connection between the wireless gateway and the wireless node terminal. Compared with the LPWAN systems such as LoRA, sigfox and the like which work in an unlicensed frequency band, the ultra-narrow band electric power Internet of things communication system is higher in transmitting power, is not easy to be interfered by other systems, is higher in signal penetrating capacity, wider in coverage range and application scene, and is more guaranteed in system reliability and safety, and suitable for electric power industrial application. Compared with a wireless private network, the system has the advantages of low engineering site selection and construction requirements, long communication distance, large connection quantity, low power consumption of terminal equipment, small data adaptation, low frequency adaptation and large connection of the power state monitoring Internet of things service.
The invention adopts ultra-narrow band transmission, the transmission distance is longer and the system capacity is larger. The bandwidth of the sub-channel adopted by the invention is 200Hz, and compared with the wireless technology with the channel bandwidth of 200kHz, the power spectrum density is improved by 1000 times and the number of the sub-channels is increased by 1000 times under the same transmitting power condition. Therefore, the single-hop transmission distance of the patent is farther, and the number of users which can be supported is larger, namely the system capacity is larger.
The invention supports the sleep mode and the self-adaptive adjustment of the transmitting power, the terminal node automatically enters the sleep mode when no data transmission requirement exists, and the transmitting power is reduced when the quality of the received signal is better, so that the power consumption can be saved, and the service life of the battery can be prolonged.
The terminal node is simple to realize, low in cost and suitable for large-scale deployment application.
Drawings
FIG. 1 is a schematic diagram of an ultra-narrow band power Internet of things communication system according to the present invention;
FIG. 2 is a frequency cognition schematic diagram in accordance with the present invention;
FIG. 3 is a schematic diagram of spectrum aggregation in accordance with the present invention;
FIG. 4 is a schematic diagram of an ultra-narrow band in accordance with the present invention;
FIG. 5 is a schematic diagram of a gateway principle according to the present invention;
Fig. 6 is a schematic flow chart of a communication method of an ultra-narrow band power internet of things communication system provided by the invention;
Fig. 7 is a specific flowchart of a communication method embodiment of an ultra-narrowband electric power internet of things communication system according to the present invention.
Detailed Description
The following describes the embodiments of the present invention in further detail with reference to the drawings.
Example 1:
the invention provides an ultra-narrow band power internet of things communication system, the structure of which is shown in figure 1, comprising:
A wireless gateway and a plurality of wireless node terminals wirelessly connected with the wireless gateway;
The wireless gateway is connected to the electric power Internet of things platform through an electric power transmission network;
The wireless gateway works in a special frequency band of electric power and is used for selecting unused frequency points in the special frequency band of electric power to construct communication connection between the wireless gateway and the wireless node terminal.
The ultra-narrow band power internet of things communication system will be described in detail below with an example of a 230M power wireless private network spectrum resource as a power private band.
In the embodiment, based on 230M power wireless private network spectrum resources, on-site available wireless frequency point resources are selected through an advanced spectrum cognition technology, and a plurality of 25kHz frequency points which are optimal and continuous are selected for spectrum aggregation, so that a working frequency band with 25kHz multiplied by N bandwidth is formed, and N can be selected from 1, 2, 4, 8 and the like. The method comprises the steps of selecting a single channel bandwidth with a 200Hz bandwidth to form up to 1000 ultra-narrow band channels, realizing efficient utilization of resources and multi-access of thousands of sensors and intelligent terminals on site based on a frequency division multi-access method and a lightweight network protocol, and constructing a low-power-consumption wide area Internet of things communication system meeting the service requirements of the electric power Internet of things.
The communication system structure of the ultra-narrow band electric power internet of things is shown in fig. 1, and a network is a star-shaped network topology structure formed by a wireless gateway and a plurality of wireless terminal nodes. The wireless gateway is used as a control center of the network and is responsible for the construction and management of the network. After power-on, firstly detecting the use condition of 280 power frequency points in 223-235MHz frequency band, selecting single or continuous multiple discrete frequency points with 25kHz bandwidth for spectrum aggregation, determining the available working frequency band of the network, initializing the network and entering a normal working mode.
After the terminal is powered on, detecting a gateway downlink broadcast channel and a synchronous beacon in a 230MHz frequency band, actively transmitting a network access request signal, registering in the gateway, and distributing terminal node addresses by the gateway according to terminal service classification and priority. The terminals cannot communicate with each other, the terminals have only one-hop path from the gateway, and the two-way communication between the gateway and the plurality of terminals is realized through a channel access control protocol.
The wireless gateway is connected with the power transmission network in a wired way, and is connected with the power internet of things platform through the power transmission network, so that connection and service from various service terminals and sensor data to the service application system in the field are realized.
Fig. 2 is a frequency cognition schematic. Frequency awareness is accomplished by the gateway. After the gateway is powered on, frequency cognition is firstly carried out in 280 discrete frequency points of the 223-235MHz frequency band. Frequency awareness methods include, but are not limited to, energy detection, cyclostationary feature detection, and the like. Taking energy detection as an example, if the detected signal energy value of a certain frequency band is smaller than a preset detection threshold, the frequency band is considered to be available, otherwise, the frequency band is considered to be unavailable. The frequency band detection sequence includes, but is not limited to, sequence detection, random detection, and the like.
Fig. 3 is a schematic diagram of spectrum aggregation. After the gateway completes frequency cognition, according to the initial setting, selecting adjacent 1/2/4/8 discrete frequency points of 25kHz, and performing spectrum aggregation to form a system working frequency band of 25kHz/50kKHz/100kHz/200 kHz.
Fig. 4 is an ultra-narrow band schematic diagram. The single channel bandwidth is 200Hz, and when the system selects the working frequency band of 25kHz/50kKHz/100kHz/200kHz, the total number of the included channels is 125/250/500/1000.
Fig. 5 is a schematic diagram of the principle of the wireless gateway. The wireless gateway is composed of a receiving and transmitting subsystem and a control subsystem.
The receiving and transmitting subsystem is responsible for receiving and transmitting the wireless signal, including physical layer frame encapsulation, coding, modulation, radio frequency receiving and transmitting circuit, etc.
The control subsystem includes protocol processing, radio resource management, and node registration management functions. Wherein the protocol processing part implements a lightweight communication protocol, and the radio resource management includes frequency awareness and subchannel allocation.
Example 2:
Based on the same inventive concept, the invention also provides a communication method of the ultra-narrow band power Internet of things communication system.
The basic flow of the method is shown in fig. 6, which comprises the following steps:
Step 1: connecting a wireless gateway in the ultra-narrow band power internet of things communication system to a power internet of things platform through a power transmission network;
Step 2: adopting a wireless gateway to recognize unused frequency points in a special frequency band of electric power;
Step 3: and selecting unused frequency points to construct wireless communication connection between the wireless gateway and the wireless node terminal.
Wherein, step 2 includes:
Adopting the wireless gateway to obtain unused frequency points in the special frequency band of the electric power by using an energy detection method or a cyclostationary characteristic detection method;
the frequency detection sequence in the energy detection method or the cyclostationary characteristic detection method comprises the following steps: sequential detection and random detection.
Wherein, between step 2 and step 3, still include:
step 2-1: selecting a single or continuous plurality of unused frequency points to perform spectrum aggregation to obtain an operating frequency band of the ultra-narrow band power Internet of things communication system;
step 2-2: dividing sub-channels according to a preset bandwidth on an operating frequency band;
Step 2-3: and initializing the network according to the sub-channels, and entering a normal working mode.
Wherein, step 3 includes:
Step 3-1: the wireless gateway sets a broadcast channel based on the sub-channel and transmits a beacon corresponding to the broadcast channel to the wireless node terminal;
Step 3-2: the wireless gateway constructs wireless communication connection between the wireless gateway and the wireless node terminal according to the received reply of the wireless node terminal for the beacon;
The width of the frequency point is 25kHz, and the width of the sub-channel is 200Hz.
The step 3-2 specifically comprises the following steps:
The wireless gateway allocates an address and a channel for the wireless node terminal according to the received reply of the wireless node terminal for the beacon, and sends a network access confirmation message to the wireless node terminal;
After receiving the network access confirmation message, the wireless node terminal configures the website of the wireless node terminal and adjusts the working frequency according to the address and the channel allocated by the wireless gateway, thereby completing the wireless communication connection between the wireless gateway and the wireless node terminal.
After step 3-2, further comprising:
when the wireless node terminal does not have a data transmission request, entering a sleep mode;
When the wireless node terminal has a data transmission request, completing data transmission;
wherein the waking up of the sleep mode comprises: periodic wakeup and on-demand wakeup.
Fig. 7 is a flow chart of an embodiment of a communication method of an ultra-narrow band power internet of things communication system. The method comprises the following steps:
Step 101: starting frequency cognition after the gateway node is powered on;
step 102: the gateway node selects adjacent frequencies from the perceived frequencies according to the initial setting of the system and performs frequency spectrum aggregation;
step 103: the gateway node sets a broadcast channel and starts to transmit a beacon;
step 104: after the terminal node is powered on, the beacon is searched through each frequency point in sequence;
step 105: after searching the beacon, the terminal node sends a network access application according to the beacon information;
step 106: after receiving the network access application, the gateway node allocates an address and a channel for the terminal node and sends a network access confirmation message to the terminal node;
Step 107: after receiving the network access confirmation message, the terminal node configures a network address, adjusts the working frequency and completes network access.
And after the terminal node finishes network access, if no data transmission request exists, entering a sleep mode. Terminal node wakeup includes, but is not limited to, periodic wakeup, on-demand wakeup, and the like. When periodic wakeup is employed, the end node automatically wakes up at intervals (including but not limited to 15 minutes/1 hour/2 hours/24 hours) to check if there is a data transmission requirement. If the data transmission requirement exists, completing the data transmission, otherwise, continuing to enter the sleep mode. When the on-demand wake-up is adopted, the terminal node automatically wakes up when the data transmission requirement exists, and enters the sleep mode again after the data transmission is completed.
The ultra-narrow band power internet of things communication system provided by the invention supports the self-adaptive adjustment of the transmission power, namely, when the quality of the received signal between the base station and the terminal is higher, the transmission power is reduced, and otherwise, the transmission power is increased.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It should be noted that the above embodiments are only for illustrating the technical solution of the present application and not for limiting the scope of protection thereof, and although the present application has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that various changes, modifications or equivalents may be made to the specific embodiments of the application after reading the present application, and these changes, modifications or equivalents are within the scope of protection of the claims appended hereto.
Claims (7)
1. An ultra-narrow band power internet of things communication system, comprising:
a wireless gateway and a plurality of wireless node terminals wirelessly connected with the wireless gateway;
the wireless gateway is connected to the electric power internet of things platform through an electric power transmission network;
The wireless gateway works in a special power frequency band and is used for selecting unused frequency points in the special power frequency band to construct communication connection between the wireless gateway and the wireless node terminal;
the wireless gateway comprises: a transceiver subsystem and a control subsystem;
The receiving and transmitting subsystem is in wireless connection with the wireless node terminal and is also in wired connection with the power transmission network, and is used for receiving and transmitting signals between the wireless node terminal and the power internet of things platform;
the control subsystem is used for identifying unused frequency points in the power dedicated frequency band, distributing the frequency points to wireless node terminals in wireless connection with the wireless gateway, and performing registration management and communication protocol management on the wireless node terminals through the transceiver subsystem;
The control subsystem comprises a protocol processing module, a wireless resource management module and a node registration management module;
The protocol processing module is used for processing a communication protocol between the transceiver subsystem and the wireless node terminal;
The node registration management module is used for registering and managing the wireless node terminal through the receiving and transmitting subsystem;
The wireless resource management module is used for cognizing the special frequency band of the electric power, selecting a single or continuous plurality of unused frequency points to perform spectrum aggregation according to the unused frequency points in the cognized special frequency band of the electric power, and obtaining the working frequency band of the ultra-narrow band electric power Internet of things communication system; dividing sub-channels according to preset bandwidths on the working frequency band, and distributing the sub-channels connected with the wireless node terminal; based on a frequency division multiple access method and a lightweight network protocol, accessing the wireless node terminal through the transceiver subsystem;
The width of the frequency point is 25kHz, and the width of the sub-channel is 200Hz.
2. The system of claim 1, wherein the transceiver subsystem comprises a physical layer frame encapsulation module, a coding module, a modulation module, and a radio frequency transceiver circuit module:
the physical layer frame packaging module is used for packaging signals between the wireless node terminal and the electric power internet of things platform in a physical layer;
the coding module is used for coding the signals packaged by the physical layer;
The modulation module is used for modulating the coded signal;
the radio frequency transceiver circuit module is used for receiving and transmitting the modulated signals.
3. The system of claim 1, wherein the signals between the wireless node terminal and the power internet of things platform include grid load control commands and power usage acquisition data.
4. The communication method of the ultra-narrow band power internet of things communication system is characterized by comprising the following steps of:
connecting a wireless gateway in the ultra-narrow band power internet of things communication system to a power internet of things platform through a power transmission network;
adopting the wireless gateway to recognize unused frequency points in a special frequency band of electric power;
selecting unused frequency points to construct wireless communication connection between the wireless gateway and the wireless node terminal;
The adopting the unused frequency point in the wireless gateway cognitive power dedicated frequency band comprises the following steps:
Adopting the wireless gateway to obtain unused frequency points in the special frequency band of the electric power by using an energy detection method or a cyclostationary characteristic detection method;
The frequency detection sequence in the energy detection method or the cyclostationary characteristic detection method comprises the following steps: sequential detection and random detection;
After the wireless gateway is adopted to cognize the unused frequency points in the special frequency band of the electric power and before the unused frequency points are selected to construct wireless communication connection between the wireless gateway and the wireless node terminal, the method further comprises the following steps:
selecting a single or continuous plurality of unused frequency points to perform spectrum aggregation to obtain an operating frequency band of the ultra-narrow band power Internet of things communication system;
dividing sub-channels according to a preset bandwidth on the working frequency band;
Initializing a network according to the sub-channels, and entering a normal working mode;
The selecting the unused frequency points to construct wireless communication connection between the wireless gateway and the wireless node terminal comprises the following steps:
The wireless gateway sets a broadcast channel based on the sub-channel and sends a beacon corresponding to the broadcast channel to the wireless node terminal;
The wireless gateway constructs wireless communication connection between the wireless gateway and the wireless node terminal according to the received reply of the wireless node terminal for the beacon;
Accessing the wireless node terminal based on a frequency division multiple access method and a lightweight network protocol;
The width of the frequency point is 25kHz, and the width of the sub-channel is 200Hz.
5. The method of claim 4, wherein the wireless gateway constructing a wireless communication connection between the wireless gateway and the wireless node terminal based on the received reply to the beacon by the wireless node terminal comprises:
the wireless gateway allocates an address and a channel for the wireless node terminal according to the received reply of the wireless node terminal for the beacon, and sends a network access confirmation message to the wireless node terminal;
After receiving the network access confirmation message, the wireless node terminal configures the website of the wireless node terminal and adjusts the working frequency according to the address and the channel allocated by the wireless gateway, thereby completing the wireless communication connection between the wireless gateway and the wireless node terminal.
6. The method of claim 5, wherein after the completing the connection with the wireless gateway, further comprising:
when the wireless node terminal does not have a data transmission request, entering a sleep mode;
when the wireless node terminal has a data transmission request, completing data transmission;
Wherein the waking up of the sleep mode comprises: periodic wakeup and on-demand wakeup.
7. The method of claim 4, wherein after the selecting the unused frequency points establishes the wireless communication connection between the wireless gateway and the wireless node terminal, further comprising:
The control subsystem of the wireless gateway is adopted, and registration management and communication protocol management are carried out on the wireless node terminal through the receiving and transmitting subsystem of the wireless gateway;
and adopting the receiving and transmitting subsystem to carry out signal transmission between the wireless node terminal and the electric power internet of things platform in a bidirectional manner.
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| CN112769511B (en) * | 2020-12-31 | 2022-03-11 | 上海遨有信息技术有限公司 | Interference channel elimination and frequency point distribution method based on narrowband power Internet of things |
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