CN113055049B - Dual-channel automatic switching device and method for dual-mode multi-frequency Internet of things communication - Google Patents
Dual-channel automatic switching device and method for dual-mode multi-frequency Internet of things communication Download PDFInfo
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- CN113055049B CN113055049B CN202110260574.2A CN202110260574A CN113055049B CN 113055049 B CN113055049 B CN 113055049B CN 202110260574 A CN202110260574 A CN 202110260574A CN 113055049 B CN113055049 B CN 113055049B
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- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
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Abstract
The invention relates to the field of electric power. The dual-channel automatic switching device for the dual-mode multi-frequency Internet of things communication comprises a broadband power line carrier communication module, a wireless communication module, a channel measurement module and a channel selection module, wherein the signal selection module controls the service conditions of the broadband power line carrier communication module and the wireless communication module according to the measurement result of the channel measurement module, so that the channel selection is completed. The wireless communication system has the advantages that the two communication modes of broadband power line carrier communication and wireless communication are integrated, the advantages of the two communication modes can be fully exerted, the defects of the two communication modes are mutually overcome, the wired and wireless communication modes are integrated into a mixed type multi-stage skip network, and indoor and outdoor non-blind-area signal coverage and reliable communication can be realized.
Description
Technical Field
The invention relates to the field of communication, in particular to a communication channel.
Background
Existing communication channels are all single mode. Either broadband power line carriers or micropower wireless are used.
Both of these two communication methods have their own drawbacks:
the broadband power line carrier carries out data transmission by relying on the existing power resources, and the low-voltage power line is used for transmitting electric energy, so that the communication environment of the power line is very severe, the noise pollution is serious, and the narrowband power line carrier communication is particularly influenced by network noise, impedance, harmonic waves and the like.
The micro-power wireless is used for data transmission through space electromagnetic waves, has higher requirements on installation environment, is sensitive to direction and is greatly influenced by shielding of buildings. In addition, due to the change of modern technology, wireless communication equipment is widely used, and the pollution of space electromagnetic waves is more and more serious, which seriously affects the acquisition success rate.
Disclosure of Invention
The invention aims to provide a dual-channel automatic switching device for dual-mode multi-frequency internet of things communication, which can be used for switching between two channels, so that the two channels can work independently and parallelly and work cooperatively, and the technical problem is solved.
The invention also aims to provide a dual-channel automatic switching method for the dual-mode multi-frequency Internet of things communication.
The technical problem solved by the invention can be realized by adopting the following technical scheme:
the dual-channel automatic switching device for the dual-mode multi-frequency Internet of things communication comprises a broadband power line carrier communication module for data transmission through a low-voltage power line, and is characterized by further comprising a wireless communication module for data transmission through space electromagnetic waves;
the system also comprises a channel measuring module which is used for measuring the unblocked conditions of the channels of the broadband power line carrier communication module and the wireless communication module;
the signal selection module controls the use conditions of the broadband power line carrier communication module and the wireless communication module according to the measurement result of the channel measurement module, so that the channel selection is completed.
Preferably, the broadband power line carrier communication module adopts an Orthogonal Frequency Division Multiplexing (OFDM) technology, the frequency band is 2MHz-12MHz, and the communication rate can reach more than 300 kbits/s. Compared with the traditional low-speed narrow-band power line carrier technology, the broadband power line carrier communication module has the advantages of large bandwidth and high transmission rate, and can meet the higher requirement of low-voltage power line carrier communication. Meanwhile, the broadband power line carrier communication can construct a communication network by means of a power network, realizes sensing of the scale of hundred million nodes and efficient and ubiquitous access of sensing devices, and is one of the best technical means for getting through the last kilometer of the power internet of things.
Preferably, the frequency of the wireless communication module is less than 1GHz, and more preferably, the frequency is 27MHz to 960MHz, the signal coverage is larger and the power consumption is lower than that of a 2.4GHz signal, and the frequency band is mainly used for a proprietary low duty cycle link and has less interference. Thus, the longer range of wireless communication allows the smart grid to access more homes and businesses to communicate with fewer hubs, which saves the utility provider's deployment and maintenance costs.
The dual-channel automatic switching method for the dual-mode multi-frequency Internet of things communication is characterized in that in the first step, after power is on, a wireless micro-power transmitter and a wireless micro-power receiver are silenced, the power line carrier receiver firstly performs channel measurement, and the result of the channel measurement is in four states: excellent, good, fair and poor are represented by CHP, CHc represents the measurement result of the power line carrier communication channel, and the measurement result is compared with three thresholds, namely CHP threshold 1, CHP threshold 2 and CHP threshold 3, and CHc > is CHP threshold 1, and CHP is excellent; CHP threshold 1> CHc > -CHP threshold 2, CHP is good; CHP threshold 2> CHc > -CHP threshold 3, CHP ═ ok; CHc < CHP threshold 3, CHP is poor;
and step two, silencing the power line carrier transmitter and the power line carrier receiver, performing channel estimation by the wireless micropower receiver, and obtaining a channel measurement result in four states: excellent, good, fair and poor are represented by CHW, CHc represents the measurement result of the wireless micro-power communication channel, and the measurement result is compared with three thresholds, namely a CHW threshold 1, a CHW threshold 2 and a CHW threshold 3; if CHc > is CHW threshold 1, CHW is excellent; if CHW threshold 1> CHc > CHW threshold 2, CHW is good; if CHW threshold 2> CHc > CHW threshold 3, CHW is ok; CHc < CHW threshold 3, CHW is poor;
and step three, determining the selection of the current channel according to the states of the CHP and the CHW:
CHP state is excellent: whatever the state of the CHW, the current channel selects CHP;
CHP state is good: if the CHW state is excellent, the current channel selects CHW, and if the CHW state is good or below, the current channel selects CHP;
when the CHP state is available, if the CHW state is excellent or good, the current channel selects the CHW, and if the CHW state is up to the CHP state, the current channel selects the CHP;
when the CHP state is poor: if the CHW status is good or not good, the current channel selects CHW, and if the CHW status is bad, the current channel selects CHP.
Has the advantages that: the wireless communication system has the advantages that the two communication modes of broadband power line carrier communication and wireless communication are integrated, the advantages of the two communication modes can be fully exerted, the defects of the two communication modes are mutually overcome, the wired and wireless communication modes are integrated into a mixed type multi-stage skip network, and indoor and outdoor non-blind-area signal coverage and reliable communication can be realized.
Drawings
FIG. 1 is a physical layer framework during signal transmission;
fig. 2 is a physical layer framework in signal reception.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific drawings.
A dual-channel automatic switching device for dual-mode multi-frequency Internet of things communication mainly comprises a broadband power line carrier communication module, a wireless communication module, a channel measurement module and a channel selection module. And the broadband power line carrier communication module is used for carrying out data transmission through a low-voltage power line. The wireless communication module performs data transmission through the spatial electromagnetic wave. And the channel measuring module is used for measuring the channel unblocked conditions of the broadband power line carrier communication module and the wireless communication module. And the channel selection module is used for controlling the service conditions of the broadband power line carrier communication module and the wireless communication module according to the measurement result of the channel measurement module, so that the channel selection is completed. The wireless communication system has the advantages that the two communication modes of broadband power line carrier communication and wireless communication are integrated, the advantages of the two communication modes can be fully exerted, the defects of the two communication modes are mutually overcome, the wired and wireless communication modes are integrated into a mixed type multi-stage skip network, and indoor and outdoor non-blind-area signal coverage and reliable communication can be realized.
Broadband power line carrier communication module and wireless communication module
The broadband power line carrier communication module preferably adopts an Orthogonal Frequency Division Multiplexing (OFDM) technology, the frequency band is 2MHz-12MHz, and the communication speed can reach more than 300 kbits/s. Compared with the traditional low-speed narrow-band power line carrier technology, the broadband power line carrier communication module has the advantages of large bandwidth and high transmission rate, and can meet the higher requirement of low-voltage power line carrier communication. Meanwhile, the broadband power line carrier communication can construct a communication network by means of a power network, realizes sensing of the scale of hundred million nodes and efficient and ubiquitous access of sensing devices, and is one of the best technical means for getting through the last kilometer of the power internet of things. Preferably, the frequency of the wireless communication module is less than 1GHz, and more preferably, the frequency is 27MHz to 960MHz, the signal coverage is larger and the power consumption is lower than that of a 2.4GHz signal, and the frequency band is mainly used for a proprietary low duty cycle link and has less interference. Thus, the longer range of wireless communication allows the smart grid to access more homes and businesses to communicate with fewer hubs, which saves the utility provider's deployment and maintenance costs. Bimodulus multifrequency thing networking is dual-channel automatic switching control equipment for communication can include bimodulus multifrequency thing networking chip circuit. The dual-mode multi-frequency Internet of things chip circuit is used as a signal processing circuit of the broadband power line carrier communication module and also used as a signal processing circuit of the wireless communication module. Therefore, the broadband power line carrier communication module and the wireless communication module realize multiplexing of chip circuits, and the number, the area and the cost of components on the circuit board are reduced. The broadband power line carrier communication module further comprises a power line carrier transmitter and a power line carrier receiver, and the power line carrier transmitter and the power line carrier receiver are connected with the dual-mode multi-frequency Internet of things chip circuit. The wireless communication module further comprises a wireless micro-power transmitter and a wireless micro-power receiver, and the wireless micro-power transmitter and the wireless micro-power receiver are connected with the dual-mode multi-frequency Internet of things chip circuit. The power line carrier transmitter, the power line carrier receiver, the wireless micro-power transmitter and the wireless micro-power receiver are peripheral circuits. An encoding unit and a decoding unit are preferably arranged in the dual-mode multi-frequency Internet of things chip circuit, so that signals are encoded and decoded. Referring to fig. 1, in the process of signal transmission, after data is input, the data is sequentially subjected to scrambling, channel coding, channel interleaving, diversity copying, constellation point mapping, pilot frequency insertion, IFFT, cyclic prefix & windowing, and preamble, and finally transmitted by a radio frequency front end. Referring to fig. 2, after receiving a signal, the radio frequency front end sequentially performs automatic gain control, synchronization, FFT, channel estimation, decoding, diversity combining, channel de-interleaving, channel decoding, and descrambling to complete data output. The wireless micro-power transmitter and the wireless micro-power receiver can be replaced by a wireless micro-power transceiver. The wireless micro-power transceiver has the functions of signal transmission and signal reception, and the space can be effectively saved by adopting the wireless micro-power transceiver. The wireless micro-power transceiver is provided with a signal antenna, the dual-channel automatic switching device for the dual-mode multi-frequency internet of things communication is provided with a shell, an annular groove is formed in the side wall of the shell, and a conductive wire is arranged in the annular groove in a surrounding mode and connected with the signal antenna. The innovation points of the design are as follows: 1. the conductive wire is adopted instead of a metal plate, so that the problems that the deformation degree of the conductive body and the shell is inconsistent and the glue is easy to break and fall off due to different coefficients of expansion with heat and contraction with cold of the conductive body and the shell can be solved. 2. The adoption of the surrounding arrangement mode allows the number of surrounding turns to be increased on one hand, so that the length of the conductive wire is prolonged, and the signal strength of the signal antenna is further enhanced. On the other hand, even if the situation that the conducting wire and the shell are separated from each other occurs, the surrounding mode has a certain fixing effect, and the conducting wire can be prevented from falling off. 3. The conductive wire on the shell can increase the impact resistance and the deformation resistance of the shell and can also avoid the signal attenuation of the signal antenna arranged inside the shell. The number of the surrounding turns of the conductive wire in the annular groove is not less than 10. The notch of the annular groove is sealed by the groove cover, and the annular groove is filled with liquid metal. The liquid metal fills at least one fifth to one third of the volume of the annular groove. The innovation points of the design are as follows: 1. the liquid metal can be used for radiating the antenna and the heating device in the shell. 2. The conduction of the conductive wire can be maintained after the conductive wire is partially broken, and the problem that the partial conductive wire loses functions due to breakage is avoided. The groove cover is provided with a strip-shaped bulge, the bottom of the strip-shaped bulge is abutted against the bottom of the annular groove, and the thickness of the strip-shaped bulge is gradually reduced and then gradually increased from the side of the groove cover to the bottom of the groove. Thereby the side wall of the strip-shaped bulge is in an arc shape which is inwards sunken. The strip-shaped protrusion divides the annular groove into a plurality of chambers, so that the position of the liquid metal is limited by the chambers. Meanwhile, the strip-shaped protrusions can play a supporting role, so that the supporting capacity of the groove cover can be effectively increased, and the connection position between the groove cover and the annular groove is prevented from being tilted or unglued or desoldered. The groove cover and the shell are preferably made of plastic. Further preferably a thermoplastic material. The connection part of the groove cover and the annular groove can be hot pressed together or connected through thermal curing glue. The outer edge of the groove cover is provided with first through holes at equal intervals, the groove opening of the annular groove is provided with second through holes at equal intervals, the outer edge of the groove cover covers the second through holes of the annular groove, and the first through holes are not opposite to the second through holes. The arrangement of the first through hole and the second through hole can provide a fillable space for plastics in the hot pressing process, and the thickness of the pressing part is prevented from being too large. After the pressing, the through holes which are not completely filled can be used for releasing the deformation in the process of expansion with heat and contraction with cold.
Module for measuring channel
The signal measurement module is composed of two submodules, namely a first monitoring module for monitoring the unblocked channel condition of the broadband power line carrier communication module and a second monitoring module for monitoring the unblocked channel condition of the wireless communication module. Thus, two channels can be monitored respectively or simultaneously, and the signal condition can be known and compared in time. The first monitoring module and the second monitoring module monitor the signal condition of the received signal on the channel and upload the signal condition to the channel selection module, the channel selection module compares the signal condition, and selects the channel with better signal condition as the communication channel, thereby starting the communication module corresponding to the selected communication channel and the peripheral circuit thereof. The data monitored by the first monitoring module and the second monitoring module are instantaneous values updated in real time. In order to obtain the channel condition in a period of time, the dual-mode multi-frequency internet of things chip circuit or the channel selection module uses the average value of the signal condition values in a period of time as a parameter for judging the signal condition. Assuming that M instantaneous signal condition values can be measured in about 1 second, the M instantaneous values are averaged to obtain an average signal condition value, i.e., the average signal condition value is the sum/M of the M instantaneous signal condition values.
The specific embodiment is as follows:
step one, electrifying, after electrifying, silencing a wireless micropower transmitter and a wireless micropower receiver, firstly carrying out channel measurement by a power line carrier receiver, wherein the result of the channel measurement has four states: excellent, good, fair and poor, as represented by CHP. The CHc represents a measurement result of the power line carrier communication channel, and the measurement result is compared with three thresholds, namely a CHP threshold 1, a CHP threshold 2 and a CHP threshold 3.
When CHc > is CHP threshold 1, CHP is excellent;
CHP threshold 1> CHc > -CHP threshold 2, CHP is good;
CHP threshold 2> CHc > -CHP threshold 3, CHP ═ ok;
CHc < CHP threshold 3, CHP is poor.
The sensitivity of the power line carrier receiver can reach-110 dBm. After the signal passes through the power line carrier channel, the average RSSI range of the power line carrier measured by the user is-180 dbm-75 dbm. If the average RSSI of the power line carrier is less than-60 dbm, the current power line carrier has poor channel quality and can not normally communicate; -60dmb < mean RSSI of power line carrier < -55dbm, which indicates that the current power line carrier channel quality is still acceptable and can be used as an alternative channel; -55dmb < mean RSSI of power line carrier < -50dbm, which indicates that the current power line carrier channel quality is medium and good and can be used as a communication channel; the average RSSI of the power line carrier is greater than 50dbm, which shows that the current power line carrier channel has good quality and is a preferred channel. Defined as CHP threshold 1 ═ -50 dbm; defined as CHP threshold 2 ═ -55 dmb; defined as CHP threshold 3-60 dmb.
And step two, silencing the power line carrier transmitter and the power line carrier receiver, performing channel estimation by the wireless micropower receiver, and obtaining the channel measurement result in four states: excellent, good, fair and poor, as represented by CHW. The CHc represents a measurement result of the wireless micro-power communication channel, and the measurement result is compared with three thresholds, namely a CHW threshold 1, a CHW threshold 2 and a CHW threshold 3.
If CHc > is CHW threshold 1, CHW is excellent;
if CHW threshold 1> CHc > CHW threshold 2, CHW is good;
if CHW threshold 2> CHc > CHW threshold 3, CHW is ok;
CHc < CHW threshold 3, CHW is poor;
the sensitivity of the wireless micro-power receiver can reach-123 dBm. Assuming that the signal has passed through the radio channel, the average RSSI of the radio signal we measure is in the range-180 dbm to 75 dbm. If the average wireless RSSI < -95dbm indicates that the current wireless channel quality is poor and normal communication is possibly impossible; -95dmb < wireless average RSSI < -80dbm, which indicates that the current wireless channel quality is still available and can be used as an alternative channel; -80dmb < wireless average RSSI < -70dbm, which indicates that the current wireless channel quality is medium and good, and can be used as a communication channel; the wireless average RSSI > 70dbm shows that the quality of the current wireless channel is good and is the preferred channel. Defined as CHW threshold 1 ═ -70 dbm; defined as CHW threshold 2 ═ -80 dmb; defined as CHW threshold 3-95 dmb.
And step three, determining the selection of the current channel according to the states of the CHP and the CHW:
CHP (power line carrier channel) state is excellent: whatever the state of the CHW (sub-G wireless communication channel), the current channel selects the CHP (power line carrier channel); when the CHP (power line carrier channel) state is good: if the CHW (sub-G wireless communication channel) state is excellent, the current channel selects the CHW (sub-G wireless communication channel). If the CHW (sub-G wireless communication channel) is in a good or low state, the current channel selects CHP (power line carrier channel); CHP (power line carrier channel) state is available: if the state of the CHW (sub-G wireless communication channel) is excellent or good, the current channel selects the CHW (sub-G wireless communication channel). If the CHW (sub-G wireless communication channel) is in the following reachable state, the current channel selects the CHP (power line carrier channel); when the CHP (power line carrier channel) state is bad: if the state of the CHW (sub-G wireless communication channel) is excellent or good, the current channel selects the CHW (sub-G wireless communication channel). If the CHW (sub-G wireless communication channel) state is bad, the current channel selects CHP (power line carrier channel).
The measurement of the channel can be performed by an existing measurement method. The innovative point of the design is not to measure the channel strength, so the channel strength measurement method is not described in detail. The innovation point of the design is that the threshold value is quantized, so that the channel switching has a clear standard. The innovative point of the design is that the measurement sequence of the channels is appointed, the broadband power line carrier channel is measured firstly, then the wireless communication channel is measured, the CHP state is excellent, the broadband power line carrier channel can be directly started, and the wireless communication channel is not measured. Thereby reducing device power consumption and reducing occupation of wireless communication channels.
The dual-channel automatic switching device for the dual-mode multi-frequency Internet of things communication further comprises a communication module between the switching devices, and the communication module is used for data transmission between the dual-channel automatic switching devices for the dual-mode multi-frequency Internet of things communication in a certain space range. The certain space range can be a signal radiation range of a communication module between the switching devices, and can also be a specified dual-channel automatic switching device for the dual-mode multi-frequency internet of things communication allowing communication to be established. The communication module between the switching devices is connected with the channel selection module. When the CHW state is poor and the CHP state is also poor, the channel selection module can send the data to be transmitted to another dual-channel automatic switching device for dual-mode multi-frequency Internet of things communication through the communication module between the switching devices, and the data is sent by another dual-channel automatic switching device for dual-mode multi-frequency Internet of things communication. The communication module between the switching devices is preferably a communication module independent of the broadband power line carrier communication module and the wireless communication module, such as an infrared communication module, a bluetooth communication module, a broadband power line carrier communication module with an independent password, and a wireless communication module with an independent password. The communication module between the switching devices can directly transmit the data to be transmitted to the dual-channel automatic switching device for the dual-mode multi-frequency internet of things communication. Or only the acquisition address of the data to be transmitted can be transmitted to the dual-channel automatic switching device for dual-mode multi-frequency internet of things communication, and the data to be transmitted is transmitted to the outside after the dual-channel automatic switching device for dual-mode multi-frequency internet of things communication acquires and downloads the data to be transmitted according to the acquisition address. Therefore, the data transmission speed is improved by reducing the data amount transmitted between the switching devices and utilizing the switching devices with better signal strength to acquire and transmit data. The communication module between the switching devices transmits data or data acquisition addresses between the dual-channel automatic switching devices for dual-mode multi-frequency internet of things communication, the data sender of the data or data acquisition addresses also sends the equipment identification codes of the data sender (the dual-channel automatic switching device for dual-mode multi-frequency internet of things communication which sends the data or data acquisition addresses) to the data receiver (the dual-channel automatic switching device for dual-mode multi-frequency internet of things communication which receives the data or data acquisition addresses), and the data receiver uploads the equipment identification codes and states to the server. After-sales personnel judge the dual-channel automatic switching device for dual-mode multi-frequency internet of things communication with poor signals according to the equipment identification code received by the server, and if the dual-channel automatic switching device for dual-mode multi-frequency internet of things communication corresponding to the equipment identification code has the problem of poor signals for a long time, the maintenance is carried out. The server can display the dual-channel automatic switching device for dual-mode multi-frequency internet of things communication according to the equipment identification code and send data to the dual-channel automatic switching device for dual-mode multi-frequency internet of things communication corresponding to the equipment identification code. Thereby avoiding causing further blockage of data transmission. The dual-channel automatic switching device for the dual-mode multi-frequency Internet of things communication uploads the equipment identification code and the state to the server under the condition that the CHW state is excellent and the CHP state is excellent. The server establishes communication between the dual-channel automatic switching device for the dual-mode multi-frequency internet of things communication with the poor state and the dual-channel automatic switching device for the dual-mode multi-frequency internet of things communication with the poor state according to the preference. The user can input the position information of the equipment corresponding to the equipment identification code into the server in advance, and when a plurality of dual-channel automatic switching devices for dual-mode multi-frequency internet of things communication in good states exist, the user selects the dual-channel automatic switching device for dual-channel multi-frequency internet of things communication in which the position is close to the dual-channel automatic switching device for dual-mode multi-frequency internet of things communication in poor states to establish communication. The communication establishment comprises the step of issuing a communication password to the dual-channel automatic switching device for the dual-mode multi-frequency internet of things communication with a good state to be connected. The server can change the password used when the communication module between the switching devices of the dual-channel automatic switching device for dual-mode multi-frequency internet of things communication establishes communication when the state of the dual-channel automatic switching device for dual-mode multi-frequency internet of things communication is good. Therefore, the password is updated, and the risk of stealing the password is reduced. The server is provided with a storage module, and the storage module stores the corresponding relation information of the password, the equipment position, the equipment state and the equipment identification code. When the new password and the new position appear, the new password and the new position cover the former password and position. When a new state occurs, the state and the time at which the state occurs are recorded. Therefore, the state and time curve graph is constructed by using the state and the time when the state appears, and the state and time curve graph is used for analyzing the signal change condition of the equipment and assisting in judging whether the equipment is in failure, atmospheric electromagnetic field change and the like. For example, the server cannot receive the equipment identifier and the state uploaded by the dual-channel automatic switching device for dual-mode multi-frequency internet of things communication for a long time. The server can actively issue a query instruction to the dual-channel automatic switching device for dual-mode multi-frequency internet of things communication corresponding to the equipment identifier, and the dual-channel automatic switching device for dual-mode multi-frequency internet of things communication returns the current state and the equipment identifier after receiving the query instruction. The server judges whether the dual-channel automatic switching device for the dual-mode multi-frequency Internet of things communication fails according to whether the current state is returned within the set time. If not, the server writes the current state to the storage module if it fails.
The foregoing shows and describes the general principles and features of the present invention, together with the advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. The dual-channel automatic switching device for the dual-mode multi-frequency Internet of things communication comprises a broadband power line carrier communication module for data transmission through a low-voltage power line, and is characterized by further comprising a wireless communication module for data transmission through space electromagnetic waves;
the system also comprises a channel measuring module which is used for measuring the unblocked conditions of the channels of the broadband power line carrier communication module and the wireless communication module;
the signal selection module controls the use conditions of the broadband power line carrier communication module and the wireless communication module according to the measurement result of the channel measurement module, so that the channel selection is completed;
when the channel states of the broadband power line carrier communication module and the wireless communication module are both poor, the channel selection module sends the data to be transmitted to another dual-channel automatic switching device for dual-mode multi-frequency internet-of-things communication through the communication module between the switching devices, and the data is sent out by the other dual-channel automatic switching device for dual-mode multi-frequency internet-of-things communication;
the communication module among the switching devices is an infrared communication module, a Bluetooth communication module, a broadband power line carrier communication module with an independent password or a wireless communication module with an independent password, which are independent of the broadband power line carrier communication module and the wireless communication module;
when the communication module between the switching devices transmits data or data acquisition addresses between the dual-channel automatic switching devices for dual-mode multi-frequency Internet of things communication, the data sender of the data or data acquisition addresses also sends the equipment identification codes of the data sender to the data receiver, and the data receiver uploads the equipment identification codes and the states to the server;
the data sender is a dual-channel automatic switching device for dual-mode multi-frequency Internet of things communication for sending data or acquiring addresses of the data; the data receiver is a dual-channel automatic switching device for dual-mode multi-frequency internet of things communication for receiving data or data acquisition addresses.
2. The dual-channel automatic switching device for dual-mode multi-frequency internet of things communication according to claim 1, wherein: the frequency band of the broadband power line carrier communication module is 2MHz-12 MHz.
3. The dual-channel automatic switching device for dual-mode multi-frequency internet of things communication according to claim 1, wherein: the frequency of the wireless communication module is below 1 GHz.
4. The dual-channel automatic switching device for dual-mode multi-frequency internet of things communication according to claim 3, wherein: the frequency of the wireless communication module is 27 MHz-960 MHz.
5. The dual-channel automatic switching device for dual-mode multi-frequency internet of things communication according to claim 1, wherein: the broadband power line carrier communication module comprises a dual-mode multi-frequency Internet of things chip circuit, wherein the dual-mode multi-frequency Internet of things chip circuit is used as a signal processing circuit of the broadband power line carrier communication module and is also used as a signal processing circuit of the wireless communication module.
6. The dual-channel automatic switching device for dual-mode multi-frequency internet of things communication according to claim 5, wherein: the broadband power line carrier communication module further comprises a power line carrier transmitter and a power line carrier receiver, and the power line carrier transmitter and the power line carrier receiver are connected with the dual-mode multi-frequency Internet of things chip circuit.
7. The dual-channel automatic switching device for dual-mode multi-frequency internet of things communication according to claim 5, wherein: the wireless communication module further comprises a wireless micro-power transmitter and a wireless micro-power receiver, and the wireless micro-power transmitter and the wireless micro-power receiver are connected with the dual-mode multi-frequency Internet of things chip circuit.
8. The dual-channel automatic switching method for dual-mode multi-frequency internet of things communication is characterized in that in the first step, the dual-channel automatic switching device for dual-mode multi-frequency internet of things communication as claimed in any one of claims 1 to 7 is powered on, after the power on, the wireless micro-power transmitter and the wireless micro-power receiver are silent, the power line carrier receiver firstly performs channel measurement, and the result of the channel measurement is in four states: excellent, good, fair and poor are represented by CHP, CHC represents the measurement result of the power line carrier communication channel, the measurement result is compared with three thresholds, namely CHP threshold 1, CHP threshold 2 and CHP threshold 3, CHC > = CHP threshold 1, and CHP = excellent; CHP threshold 1> CHC > = CHP threshold 2, CHP = good; CHP threshold 2> CHC > = CHP threshold 3, CHP = ok; CHC < CHP threshold 3, CHP = poor;
and step two, silencing the power line carrier transmitter and the power line carrier receiver, and performing channel measurement by the wireless micropower receiver, wherein the result of the channel measurement has four states: excellent, good, fair and poor are represented by CHW, CHc represents the measurement result of the wireless micro-power communication channel, and the measurement result is compared with three thresholds, namely a CHW threshold 1, a CHW threshold 2 and a CHW threshold 3; CHc > = CHW threshold 1, CHW = excellent; CHW threshold 1> CHc > = CHW threshold 2, CHW = good; CHW threshold 2> CHc > = CHW threshold 3, CHW = ok; CHc < CHW threshold 3, CHW = bad;
and step three, determining the selection of the current channel according to the states of the CHP and the CHW:
CHP state is excellent: whatever the state of the CHW, the current channel selects CHP;
CHP state is good: if the CHW state is excellent, the current channel selects CHW, and if the CHW state is good or below, the current channel selects CHP;
when the CHP state is available, if the CHW state is excellent or good, the current channel selects the CHW, and if the CHW state is up to the CHP state, the current channel selects the CHP;
when the CHP state is poor: if the CHW state is excellent or good or not, selecting CHW by the current channel, and if the CHW state is poor, selecting CHP by the current channel;
when the CHW state is poor and the CHP state is also poor, the channel selection module sends data to be transmitted to another dual-channel automatic switching device for dual-mode multi-frequency Internet of things communication through the communication module between the switching devices, and the data is sent by the other dual-channel automatic switching device for dual-mode multi-frequency Internet of things communication;
the communication module among the switching devices is an infrared communication module, a Bluetooth communication module, a broadband power line carrier communication module with an independent password or a wireless communication module with an independent password, which are independent of the broadband power line carrier communication module and the wireless communication module;
when the communication module between the switching devices transmits data or data acquisition addresses between the dual-channel automatic switching devices for dual-mode multi-frequency Internet of things communication, the data sender of the data or data acquisition addresses also sends the equipment identification codes of the data sender to the data receiver, and the data receiver uploads the equipment identification codes and the states to the server;
the data sender is a dual-channel automatic switching device for dual-mode multi-frequency Internet of things communication for sending data or acquiring addresses of the data; the data receiver is a dual-channel automatic switching device for dual-mode multi-frequency internet of things communication for receiving data or data acquisition addresses.
9. The dual-channel automatic switching method for dual-mode multi-frequency internet of things communication according to claim 8, wherein: CHP threshold 1= -50 dmb; CHP threshold 2= -55 dmb; CHP threshold 3= -60 dmb.
10. The dual-channel automatic switching method for dual-mode multi-frequency internet of things communication according to claim 8, wherein: CHW threshold 1= -70 dmb; CHW threshold 2= -80 dmb; CHW threshold 3= -95 dmb.
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