CN114173432A - Multi-frequency-band wireless sensing network system - Google Patents
Multi-frequency-band wireless sensing network system Download PDFInfo
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- CN114173432A CN114173432A CN202111337465.2A CN202111337465A CN114173432A CN 114173432 A CN114173432 A CN 114173432A CN 202111337465 A CN202111337465 A CN 202111337465A CN 114173432 A CN114173432 A CN 114173432A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/04—Arrangements for maintaining operational condition
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention provides a multi-band wireless sensing network system, which realizes two-way communication by setting a plurality of independent frequency bands and interacting a control unit and a terminal through the frequency bands, and simultaneously ensures high real-time performance; only the terminal which receives the control instruction sent by the control unit can send terminal information to the control unit, so that mutual interference in the communication process is effectively avoided, and the communication quality is ensured; the sharing of terminal information is realized through the mutual connection among the control units, and the strength of the control units can be judged through the physical characteristics of wireless signals after the control units receive the terminal signals, so that the terminal is connected with the control unit with stronger wireless signals, and the working stability of the terminal is ensured.
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to a multi-band wireless sensing network system.
Background
With the development of radio frequency transceiving technology, microelectronic technology and integrated circuits, wireless communication technology has been greatly developed, and great progress has been made in design cost, transmission rate and reliability. Is slowly evolving to the level of wired network transmission; the wireless data acquisition technology adopted in the industrial field is a new development trend, the problems existing in the traditional data acquisition can be solved, and the applicability of the system is improved.
At present, the robot technology develops rapidly, but a control system still depends on a wired network, so that the problems that the scene limitation is large, the wiring is difficult, the terminal cannot move freely and the like exist, and the problems of coexistence and high real-time performance of a large amount of equipment cannot be solved by a mainstream wireless scheme such as WIFI, Bluetooth, ZigBee and the like.
Disclosure of Invention
The invention aims to solve the problems that in the prior art, no proper solution is available for control and signal acquisition of a large number of intelligent devices accessed in the same space, and the existing wireless network is poor in real-time performance and cannot perform two-way communication.
In order to achieve the purpose, the invention adopts the following technical scheme: a multi-band wireless sensor network system is used for realizing two-way communication with a terminal and comprises a first control unit, a server and a first wireless sensor network unit, wherein a first terminal list of the terminal establishing communication with the first control unit is stored in the first control unit, a total terminal list of all the terminals is stored in the server, the server is connected with the first control unit, the first wireless sensor network unit corresponds to the first control unit, and the first wireless sensor network unit comprises a first command downlink frequency band, a first broadcast frequency band, a first message downlink frequency band, a first message uplink frequency band and a first connection frequency band; the first control unit sends a first connection instruction to a terminal which is not communicated with the first control unit through a first connection frequency band, the terminal which is not communicated with the first control unit sends a communication request to the first control unit through a first broadcast frequency band after receiving the first connection instruction, and the first control unit inserts the terminal which sends the communication request to the front end of a first terminal list after receiving the communication request; the first control unit sends first control instructions of a first message uplink frequency band to each terminal in sequence according to the sequence of the terminals stored in the first terminal list, each terminal sends terminal information to the first control unit through the first message uplink frequency band after receiving the first control instructions, the first control unit sends the terminal information to the server after receiving the terminal information, and the first control unit sends the information to the corresponding terminal through the first message downlink frequency band after receiving the information returned by the server.
Preferably, the priority of the first command downlink frequency band is higher than the priority of the first broadcast frequency band.
Preferably, the first wireless sensor network unit further includes a first failure uplink frequency band, and the first control unit receives failure information sent by a terminal that establishes communication with the first control unit through the first failure uplink frequency band.
Further, the first control unit receives a burst communication request sent by a terminal establishing communication with the first control unit through a first broadcast frequency band, and after receiving the burst communication request, the first control unit inserts the terminal sending the burst communication request to the front end of the first terminal list, and sends a first control instruction of the first message uplink frequency band to the terminal sending the burst communication request through a first command downlink frequency band.
The wireless sensor network system further comprises a second control unit and a second wireless sensor network unit, wherein a second terminal list of terminals establishing communication with the second control unit is stored in the second control unit, the second control unit is connected with the server, the second control unit is connected with the first control unit, the second wireless sensor network unit corresponds to the second control unit, and the second wireless sensor network unit comprises a second failure uplink frequency band, a second command downlink frequency band, a second broadcast frequency band, a second message downlink frequency band, a second message uplink frequency band and a second connection frequency band; the second control unit sends a second connection instruction to the terminal which is not communicated with the second control unit through a second connection frequency band, the terminal which is not communicated with the second control unit sends a communication request to the second control unit through a second broadcast frequency band after receiving the second connection instruction, the second control unit inquires the first control unit whether the terminal which sends the communication request is communicated with the first control unit or not after receiving the communication request,
when the terminal sending the communication request to the second control unit has established communication with the first control unit, the second control unit compares the signal strength of the received communication request with the signal strength of the terminal information or fault information or burst communication request sent by the same terminal and received by the first control unit, when the signal strength of the communication request received by the second control unit is stronger than the signal strength of the burst communication request sent by the same terminal and received by the first control unit, the first control unit deletes the terminal sending the communication request to the second control unit from the first terminal list, the second control unit inserts the terminal sending the communication request to the second control unit to the front end of the second terminal list, the second control unit sends a second control instruction of a second message uplink frequency band to the terminal through a second command downlink frequency band, and the terminal sends the terminal information to the second control unit through the second message uplink frequency band after receiving the second control instruction, the second control unit receives the terminal information and then transmits the terminal information to the server, and the second control unit receives the information transmitted back by the server and then transmits the information to the corresponding terminal through a second message downlink frequency band; when the signal intensity of a communication request received by the second control unit is stronger than the signal intensity of terminal information or fault information received by the first control unit and sent by the same terminal, the first control unit deletes the terminal sending the communication request to the second control unit from the first terminal list, the second control unit inserts the terminal sending the communication request to the second control unit to the front end of the second terminal list, the second control unit sends the terminal information or fault information acquired from the first control unit to the server, and the second control unit receives the information returned by the server and then sends the information to the corresponding terminal through a second message downlink frequency band;
when the terminal sending the communication request to the second control unit does not establish communication with any one of the first control unit and the second control unit, the second control unit compares the signal strength of the communication request sent by the same terminal and received by the first control unit after receiving the communication request, when the signal strength of the communication request received by the second control unit is stronger than that of the communication request sent by the same terminal and received by the first control unit, the second control unit inserts the terminal sending the communication request to the second control unit to the front end of the second terminal list, the second control unit sends a second control instruction of a second message uplink frequency band to the terminal through a second command downlink frequency band, the terminal sends terminal information to the second control unit through the second message uplink frequency band after receiving the second control instruction, and the second control unit sends the terminal information to the server after receiving the terminal information, the second control unit receives the information transmitted back by the server and transmits the information to the corresponding terminal through a second message downlink frequency band; when the signal intensity of a communication request received by the second control unit is not stronger than the signal intensity of a communication request received by the first control unit and sent by the same terminal, the first control unit inserts the terminal sending the communication request to the first control unit to the front end of the first terminal list, the first control unit sends a first control instruction of a first message uplink frequency band to the terminal through a first command downlink frequency band, the terminal sends terminal information to the first control unit through the first message uplink frequency band after receiving the first control instruction, the first control unit sends the terminal information to the server after receiving the terminal information, and the first control unit sends the information to the corresponding terminal through the first message downlink frequency band after receiving the information returned by the server;
the second control unit receives fault information sent by a terminal which establishes communication with the second control unit through a second fault uplink frequency band, the second control unit receives a burst communication request sent by the terminal which establishes communication with the second control unit through a second broadcast frequency band, the second control unit inserts the terminal which sends the burst communication request to the front end of a second terminal list after receiving the burst communication request, and sends a second control instruction of a second message uplink frequency band to the terminal which sends the burst communication request through a second command downlink frequency band.
Furthermore, the priority of the first command downlink frequency band is higher than the priority of the first broadcast frequency band, the priority of the second command downlink frequency band is higher than the priority of the second broadcast frequency band, the priority of the first failure uplink frequency band is higher than the priority of other frequency bands of the first wireless sensor network unit, and the priority of the second failure uplink frequency band is higher than the priority of other frequency bands of the second wireless sensor network unit.
Further, the priority of the first failed uplink frequency band is higher than the priority of other frequency bands of the first wireless sensor network unit.
Compared with the prior art, the invention has the beneficial effects that: by setting a plurality of independent frequency bands, the control unit and the terminal interact through the frequency bands, so that bidirectional communication is realized, and high real-time performance is ensured; only the terminal which receives the control instruction sent by the control unit can send terminal information to the control unit, so that mutual interference in the communication process is effectively avoided, and the communication quality is ensured; the sharing of terminal information is realized through the mutual connection among the control units, and the strength of the control units can be judged through the physical characteristics of wireless signals after the control units receive the terminal signals, so that the terminal is connected with the control unit with stronger wireless signals, and the working stability of the terminal is ensured.
Drawings
Fig. 1 is a schematic structural diagram of a multiband wireless sensor network system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a multiband wireless sensor network system according to another embodiment of the present invention.
Detailed Description
In order to further understand the objects, structures, features and functions of the present invention, the following embodiments are described in detail.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a multiband wireless sensor network system according to an embodiment of the present invention, in which the multiband wireless sensor network system is used for implementing bidirectional communication with a terminal device.
The multi-band wireless sensing network system comprises a first control unit 1, a server 2 and a first wireless sensing network unit 3, wherein a first terminal list 11 of terminals establishing communication with the first control unit 1 is stored in the first control unit 1, a total terminal list 21 of all terminals in the space is stored in the server 2, and the server 2 is connected with the first control unit 1 so as to receive and process information sent by the first control unit 1 and feed back result information to the first control unit 1; the first wireless sensor network unit 3 corresponds to the first control unit 1, and the first wireless sensor network unit 3 includes a first command downlink frequency band 31, a first broadcast frequency band 32, a first message downlink frequency band 33, a first message uplink frequency band 34, and a first connection frequency band 35, and realizes two-way communication between the first control unit 1 and the terminal device through these frequency bands independent of each other, and simultaneously ensures high real-time performance.
The terminal equipment comprises a first terminal 100, a second terminal 200 and a third terminal 300, wherein the first terminal 100 and the second terminal 200 are connected into the multiband wireless sensing network system, the third terminal 300 is not connected into the multiband wireless sensing network system, and the first control unit 1 inquires the third terminal 300 which is not communicated with the server 2.
Please refer to paths (r-c) in fig. 1, which are procedures for establishing communication between the third terminal 300 and the first control unit 1. The first control unit 1 sends a first connection instruction to a third terminal 300 which does not establish communication with the third terminal according to a certain period through a first connection frequency band 35, the third terminal 300 powers on and receives the first connection instruction and then sends a communication request to the first control unit 1 through a first broadcast frequency band 32, the first control unit 1 inserts the third terminal 300 to the foremost end of the first terminal list 11 after receiving the communication request and sends a first control instruction of a first message uplink frequency band 34 to the third terminal 300 through a first command downlink frequency band 31, the third terminal 300 obtains the right of use of the first message uplink frequency band 34 after receiving the first control instruction, and the third terminal 300 sends terminal information to the first control unit 1 through the first message uplink frequency band 34.
The procedure of the first and second terminals 100 and 200 establishing communication with the first control unit 1 is the same as the aforementioned procedure of the third terminal 300 establishing communication with the first control unit 1. Under normal conditions, the first control unit 1 sequentially sends first control instructions of a first message uplink frequency band 35 to each terminal according to the sequence of a first terminal list stored in the first control unit, each terminal receives the first control instructions and then sends terminal information to the first control unit 1 through the first message uplink frequency band 34, and through setting a plurality of independent frequency bands, the control unit and the terminal interact through the frequency bands, so that bidirectional communication is realized, and high real-time performance is guaranteed; only the terminal which takes the control instruction sent by the control unit can send terminal information to the control unit, so that mutual interference in the communication process is effectively avoided, and the communication quality is ensured.
In a preferred embodiment, the priority of the first command downlink band 31 is higher than the priority of the first broadcast band 32, so that after the first control unit 1 finishes sending the first control instruction of the first message uplink band 34 to the previous terminal, the terminal sending the communication request is inserted to the forefront of the first terminal list 11, and the first control instruction of the first message uplink band 34 is sent to the terminal sending the communication request through the first command downlink band 31, thereby ensuring the stability of communication.
The first control unit 1 receives the terminal information and then transmits the terminal information to the server 2, the server 2 receives the terminal information and then processes the terminal information and transmits the processed information back to the first control unit 1, and the first control unit 1 receives the transmitted information and then transmits the information to a corresponding terminal, such as the second terminal 200 in fig. 1, through the first message downlink frequency band 33. Here, the information originally processed by the terminal or the control unit may be processed by the server, so as to reduce the requirements on the software and hardware of the terminal or the control unit.
Referring to fig. 1 again, the first wireless sensor network unit 3 further includes a first failure uplink frequency band 36, the first control unit 1 receives failure information sent by the first terminal 100 through the first failure uplink frequency band 36, and after receiving the failure information, the first control unit 1 sends the failure information to the server 2, and performs corresponding operation according to information returned by the server 2. In a preferred embodiment, the priority of the first failed uplink frequency band 36 is higher than the priority of other frequency bands of the first wireless sensor network unit 3, so that the terminal failure can be handled in time.
Preferably, the first control unit 1 receives a burst communication request sent by a terminal establishing communication with the first control unit 1 through the first broadcast band 33, and after receiving the burst communication request, the first control unit 1 inserts the terminal sending the burst communication request to the front end of the first terminal list 11, and sends a first control instruction of the first message uplink band 35 to the terminal through the first command downlink band 32, so as to be able to cope with the burst situation of the terminal.
When a plurality of terminals send burst communication requests at the same time, the first control unit 1 sends a first clear instruction to the corresponding plurality of terminals through the first command downlink band 32 to suspend the broadcasting of the plurality of terminals for a period of time. After the pause time is over, the terminal which still needs to broadcast broadcasts after a random time.
When the terminal in the space needs to be added, the terminal needing to be added is written in the total terminal list 21 in the server 2 in advance; the first control unit 1 and the server are connected by a wired network, the first control unit 1 is a communication controller, and the first wireless sensing network unit 3 is a customized high-speed wireless signal transceiver (5.8 GHz, multiple sub-bands) capable of dividing frequency bands.
In the multi-band wireless sensor network system of the embodiment, the control unit and the terminal interact through a plurality of independent frequency bands, so that bidirectional communication is realized, and high real-time performance is ensured; only the terminal which takes the control instruction sent by the control unit can send terminal information to the control unit, so that mutual interference in the communication process is effectively avoided, and the communication quality is ensured.
In practical use, for example, in a large logistics park, since a terminal (e.g., a robot) is movable and a wireless network is relatively fixed, during the movement of the terminal, a signal of one wireless network becomes strong and a signal of another wireless network becomes weak, and it is necessary to switch the wireless network connected to the terminal according to the signal strength. To achieve the above object, please refer to fig. 2, fig. 2 is a schematic structural diagram of a multiband wireless sensor network system according to another embodiment of the present invention. Compared with the embodiment in fig. 1, in this embodiment, the multiband wireless sensor network system further includes a second control unit 4 and a second wireless sensor network unit 5, the second control unit 4 stores a second terminal list 41 of terminals with which communication is established, the second control unit 4 is connected with the server 2, and the second control unit 4 is connected with the first control unit 1 to be able to interact and share terminal information; the second wireless sensor network unit 5 corresponds to the second control unit 4, and the second wireless sensor network unit 5 includes a second failure uplink frequency band 51, a second command downlink frequency band 52, a second broadcast frequency band 53, a second message downlink frequency band 54, a second message uplink frequency band 55, and a second connection frequency band 56.
The terminal device corresponding to the second control unit 4 includes a fourth terminal 400 and a fifth terminal 500, and both the fourth terminal 400 and the fifth terminal 500 establish communication with the second control unit 4. Similar to the first control unit 1, the second control unit 4 receives the fault information sent by the terminal establishing communication with the second control unit 4 through the second fault uplink frequency band 51, the second control unit 4 receives the burst communication request sent by the terminal establishing communication with the second control unit 4 through the second broadcast frequency band 53, and after receiving the burst communication request, the second control unit 4 sends the second control instruction of the second message uplink frequency band 55 to the terminal sending the burst communication request through the second command downlink frequency band 52.
The second control unit 4 sends a second connection instruction to the terminal which does not establish communication with the second control unit 4 through the second connection frequency band 56, and the terminal which does not establish communication with the second control unit 4 sends a communication request to the second control unit 4 through the second broadcast frequency band 53 after receiving the second connection instruction.
The second control unit 4, having received the communication request, inquires of the first control unit 1 whether the terminal that transmitted the communication request has established communication with the first control unit 1, that is, whether the terminal that transmitted the communication request is in the first terminal list 11.
When a terminal that transmits a communication request to the second control unit 4 has established communication with the first control unit 1, as in the third terminal 300 in fig. 2, the second control unit 4 compares the signal strength of the received communication request with the signal strength of terminal information or failure information or burst communication request transmitted by the same terminal received by the first control unit 1, when the signal strength of the communication request received by the second control unit 4 is stronger than the signal strength of the burst communication request transmitted by the same terminal received by the first control unit 1, the first control unit 1 deletes the terminal that transmitted the communication request to the second control unit 4 from the first terminal list 11, the second control unit 4 inserts the terminal to which the communication request is transmitted to the front end of the second terminal list 41, the second control unit 4 transmits a second control instruction of the second message uplink band 55 to the terminal through the second command downlink band 52, the terminal sends terminal information to the second control unit 4 through the second message uplink frequency band 55 after receiving the second control instruction, the second control unit 4 sends the terminal information to the server 2 after receiving the terminal information, and the second control unit 4 sends the information to the terminal through the second message downlink frequency band 54 after receiving the information sent back by the server 2; when the signal strength of the communication request received by the second control unit 4 is stronger than the signal strength of the terminal information or the fault information sent by the same terminal and received by the first control unit 1, the first control unit 1 deletes the terminal sending the communication request to the second control unit 4 from the first terminal list 11, the second control unit 4 inserts the terminal sending the communication request to the second control unit 4 to the front end of the second terminal list 41, the second control unit 4 sends the terminal information or the fault information acquired from the first control unit 1 to the server 2, and the second control unit 4 receives the information returned by the server 2 and then transmits the information to the corresponding terminal through the second message downlink frequency band 54.
When the terminal sending the communication request to the second control unit 4 does not establish communication with any of the first control unit 1 and the second control unit 4, that is, the terminal is neither in the first terminal list 11 nor in the second terminal list 41, corresponding to the terminal which has just been powered on and has not established connection with any wireless network temporarily, the second control unit 4 compares the signal strength of the communication request sent by the same terminal received by the first control unit 1 after receiving the communication request, when the signal strength of the communication request received by the second control unit 4 is stronger than the signal strength of the communication request sent by the same terminal received by the first control unit 1, the second control unit 4 inserts the terminal sending the communication request to the terminal to the front end of the second terminal list 41, and the second control unit 4 sends the second control instruction of the second message uplink band 55 to the terminal through the second command downlink band 52, the terminal sends terminal information to the second control unit 4 through the second message uplink frequency band 55 after receiving the second control instruction, the second control unit 4 sends the terminal information to the server 2 after receiving the terminal information, and the second control unit 4 sends the information to a corresponding terminal through the second message downlink frequency band 54 after receiving the information returned by the server 2; when the signal strength of the communication request received by the second control unit 4 is not stronger than the signal strength of the communication request received by the first control unit 1 and sent by the same terminal, the first control unit 1 inserts the terminal sending the communication request to the first control unit 1 to the front end of the first terminal list 11, the first control unit 1 sends a first control instruction of a first message uplink frequency band 15 to the terminal through a first command downlink frequency band 12, the terminal sends terminal information to the first control unit 1 through the first message uplink frequency band after receiving the first control instruction, the first control unit 1 sends the terminal information to the server 2 after receiving the terminal information, and the first control unit 1 sends the information to the corresponding terminal through the first message downlink frequency band 14 after receiving the information returned by the server 2.
When in use, as in the first wireless sensor network unit 3, in order to ensure the stability of communication, the priority of the second command downlink frequency band 52 is higher than that of the second broadcast frequency band 53; in order to be able to deal with the terminal failure in time, the priority of the second failed uplink frequency band 51 is higher than the priority of the other frequency bands of the second wireless sensor network unit 5.
The multi-band wireless sensor network system of the embodiment realizes sharing of terminal information by mutual connection of the control units, and the control units can judge the strength of the terminal signal through the physical characteristics of the wireless signal after receiving the terminal signal, so that the terminal is connected with the control unit with stronger wireless signal, and the working stability of the terminal is ensured.
Similarly, for a multi-band wireless sensor network system with three or more control units and wireless sensor network units, the control units are connected with each other, and after receiving a terminal signal, each control unit judges the signal intensity to connect the terminal with the control unit with the strongest wireless signal intensity.
When the method is used, the terminal can autonomously compare the received signal strength of the connection command, the control command and the like sent by different control units to select to send information to the control unit with the strongest signal, but the method has higher requirements on the terminal.
According to the multi-band wireless sensor network system, the plurality of independent frequency bands are arranged, and the control unit and the terminal are interacted through the frequency bands, so that bidirectional communication is realized, and high real-time performance is guaranteed; only the terminal which receives the control instruction sent by the control unit can send terminal information to the control unit, so that mutual interference in the communication process is effectively avoided, and the communication quality is ensured; the sharing of terminal information is realized through the mutual connection among the control units, and the strength of the control units can be judged through the physical characteristics of wireless signals after the control units receive the terminal signals, so that the terminal is connected with the control unit with stronger wireless signals, and the working stability of the terminal is ensured.
The present invention has been described in relation to the above embodiments, which are only exemplary of the implementation of the present invention. It should be noted that the disclosed embodiments do not limit the scope of the invention. Rather, it is intended that all such modifications and variations be included within the spirit and scope of this invention.
Claims (7)
1. A multi-band wireless sensor network system for realizing bidirectional communication with a terminal, comprising:
a first control unit in which a first terminal list of terminals with which communication is established is stored;
the server is used for storing a total terminal list of all terminals and is connected with the first control unit;
the first wireless sensing network unit corresponds to the first control unit and comprises a first command downlink frequency band, a first broadcast frequency band, a first message downlink frequency band, a first message uplink frequency band and a first connection frequency band;
the first control unit sends a first connection instruction to a terminal which is not communicated with the first control unit through the first connection frequency band, the terminal which is not communicated with the first control unit sends a communication request to the first control unit through the first broadcast frequency band after receiving the first connection instruction, and the first control unit inserts the terminal which sends the communication request to the front end of the first terminal list after receiving the communication request;
the first control unit sends first control instructions of the first message uplink frequency band to each terminal in sequence according to the sequence of the terminals stored in the first terminal list, each terminal sends terminal information to the first control unit through the first message uplink frequency band after receiving the first control instructions, the first control unit sends the terminal information to the server after receiving the terminal information, and the first control unit sends the information to the corresponding terminal through the first message downlink frequency band after receiving the information sent back by the server.
2. The multiband wireless sensor network system of claim 1, wherein the priority of the first commanded downlink frequency band is higher than the priority of the first broadcast frequency band.
3. The multiband wireless sensor network system of claim 1, wherein the first wireless sensor network unit further comprises a first failure uplink band, and the first control unit receives failure information sent by a terminal establishing communication with the first control unit through the first failure uplink band.
4. The multiband wireless sensor network system of claim 3, wherein the first control unit receives a burst communication request sent by a terminal establishing communication with the first control unit through the first broadcast band, and the first control unit inserts the terminal sending the burst communication request to the front end of the first terminal list after receiving the burst communication request, and sends the first control command of the first message uplink band to the terminal sending the burst communication request through the first command downlink band.
5. The multiband wireless sensor network system of claim 4, further comprising:
a second control unit, in which a second terminal list of terminals with which communication is established is stored, the second control unit being connected to the server, the second control unit being connected to the first control unit;
the second wireless sensor network unit corresponds to the second control unit and comprises a second failure uplink frequency band, a second command downlink frequency band, a second broadcast frequency band, a second message downlink frequency band, a second message uplink frequency band and a second connection frequency band;
the second control unit sends a second connection instruction to the terminal which is not communicated with the second control unit through the second connection frequency band, the terminal which is not communicated with the second control unit sends a communication request to the second control unit through the second broadcast frequency band after receiving the second connection instruction, the second control unit inquires whether the terminal sending the communication request is communicated with the first control unit or not after receiving the communication request,
when the terminal sending the communication request to the second control unit has established communication with the first control unit, the second control unit compares the signal strength of the received communication request with the signal strength of the terminal information or fault information or burst communication request sent by the same terminal and received by the first control unit, when the signal strength of the communication request received by the second control unit is stronger than the signal strength of the burst communication request sent by the same terminal and received by the first control unit, the first control unit deletes the terminal sending the communication request to the second control unit from the first terminal list, the second control unit inserts the terminal sending the communication request to the second control unit to the front end of the second terminal list, and the second control unit sends the second control instruction of the second message uplink frequency band to the terminal through the second command downlink frequency band, the terminal sends terminal information to the second control unit through the second message uplink frequency band after receiving a second control instruction, the second control unit sends the terminal information to the server after receiving the terminal information, and the second control unit sends the information to a corresponding terminal through the second message downlink frequency band after receiving the information returned by the server; when the signal intensity of a communication request received by the second control unit is stronger than the signal intensity of terminal information or fault information received by the first control unit and sent by the same terminal, the first control unit deletes the terminal sending the communication request to the second control unit from the first terminal list, the second control unit inserts the terminal sending the communication request to the second control unit to the front end of the second terminal list, the second control unit sends the terminal information or fault information acquired from the first control unit to the server, and the second control unit receives the information returned by the server and then sends the information to the corresponding terminal through the second message downlink frequency band;
when the terminal sending the communication request to the second control unit does not establish communication with any one of the first control unit and the second control unit, the second control unit compares the signal strength of the communication request sent by the same terminal and received by the first control unit after receiving the communication request, when the signal strength of the communication request received by the second control unit is stronger than the signal strength of the communication request sent by the same terminal and received by the first control unit, the second control unit inserts the terminal sending the communication request to the second control unit to the front end of the second terminal list, the second control unit sends a second control instruction of the second message uplink frequency band to the terminal through the second command downlink frequency band, and the terminal sends terminal information to the second control unit through the second message uplink frequency band after receiving the second control instruction, the second control unit receives the terminal information and then transmits the terminal information to the server, and the second control unit receives the information transmitted back by the server and then transmits the information to the corresponding terminal through the second message downlink frequency band; when the signal intensity of a communication request received by the second control unit is not stronger than the signal intensity of a communication request received by the first control unit and sent by the same terminal, the first control unit inserts the terminal sending the communication request to the first control unit to the front end of the first terminal list, the first control unit sends a first control instruction of the first message uplink frequency band to the terminal through the first command downlink frequency band, the terminal sends terminal information to the first control unit through the first message uplink frequency band after receiving the first control instruction, the first control unit sends the terminal information to the server after receiving the terminal information, and the first control unit sends the information to a corresponding terminal through the first message downlink frequency band after receiving the information returned by the server;
the second control unit receives fault information sent by a terminal which establishes communication with the second control unit through the second fault uplink frequency band, the second control unit receives a burst communication request sent by the terminal which establishes communication with the second control unit through the second broadcast frequency band, the second control unit inserts the terminal which sends the burst communication request to the front end of a second terminal list after receiving the burst communication request, and sends a second control instruction of a second message uplink frequency band to the terminal which sends the burst communication request through the second command downlink frequency band.
6. The multiband wireless sensor network system of claim 5, wherein the priority of the first commanded downlink frequency band is higher than the priority of the first broadcast frequency band, the priority of the second commanded downlink frequency band is higher than the priority of the second broadcast frequency band, the priority of the first faulty uplink frequency band is higher than the priority of other frequency bands of the first wireless sensor network unit, and the priority of the second faulty uplink frequency band is higher than the priority of other frequency bands of the second wireless sensor network unit.
7. The multiband wireless sensor network system of claim 3, wherein the priority of the first failed upstream band is higher than the priority of other bands of the first wireless sensor network unit.
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