CN112543494A - Method and equipment for fast network access and automatic frequency hopping in wireless communication - Google Patents
Method and equipment for fast network access and automatic frequency hopping in wireless communication Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- 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
- H04B1/69—Spread spectrum techniques
- H04B1/713—Spread spectrum techniques using frequency hopping
- H04B1/7136—Arrangements for generation of hop frequencies, e.g. using a bank of frequency sources, using continuous tuning or using a transform
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
- H04W12/06—Authentication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
- H04W48/10—Access restriction or access information delivery, e.g. discovery data delivery using broadcasted information
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Abstract
The application relates to a method and equipment for fast accessing to a network and automatically hopping in wireless communication. And switching the main equipment to the public communication frequency for broadcasting, wherein the broadcasting comprises preset configured address information or randomly generated address information. And receiving a reply which is carried out after the slave equipment receives the broadcast and is successfully configured according to the address information, wherein the reply comprises the new communication frequency. And switching to a new communication frequency negotiated with the slave equipment, and initiating a configuration flow to the slave equipment to finish authentication. And receiving a configuration flow completion response sent by the slave equipment, and completing the network access with the slave equipment in a matching way. The automatic network access is completed by the self-negotiation protocol between the slave equipment and the master equipment, so that the flexibility of equipment configuration is improved, the equipment can be completely separated from the field support of technicians when in use, and the commercialization is realized. After the network access is finished, the communication frequency is switched in the whole communication network according to the communication quality until the communication quality reaches a preset level, so that the anti-interference of transmission signals is realized.
Description
Technical Field
The present application relates to the field of wireless network communications technologies, and in particular, to a method and an apparatus for fast accessing a network and automatically hopping frequencies in wireless communications.
Background
In the prior art, if a wireless network communication device needs to access a network, communication frequency bands mostly need to be preconfigured, for example, several common frequency bands are set in a program, and the selection of the frequency bands is realized through an external welding selection resistor. The master device needs to be assigned with information such as frequency, rate, ID, etc. to identify the mutual connection between the master device and other slave devices. In another implementation, the terminal address frequency of the transmission device a needs to be set first, and then the terminal address frequency of the transmission device B needs to be set manually, but the process needs field support of technicians, and is not suitable for practical application of products.
Disclosure of Invention
To overcome at least some of the problems in the related art, the present application provides a method and apparatus for fast network access and automatic frequency hopping in wireless communication.
The scheme of the application is as follows:
according to a first aspect of the embodiments of the present application, a method for fast network access and automatic frequency hopping in wireless communication is provided, including:
triggering to enter a pairing mode in a normal working state;
switching to public communication frequency for broadcasting, wherein the broadcasting comprises preset configured address information or randomly generated address information;
receiving a reply of the slave equipment after the broadcast is successfully configured according to the address information, wherein the reply comprises a new communication frequency;
switching to a new communication frequency negotiated with the slave equipment, and initiating a configuration flow to the slave equipment to finish authentication;
receiving a configuration flow completion response sent by the slave equipment, and completing pairing and network access with the slave equipment;
switching communication frequency in the whole communication network according to the communication quality until the communication quality reaches a preset level.
Preferably, in an implementation manner of the present application, after the switching to the common communication frequency for broadcasting, the method further includes:
and if the reply of the slave equipment is not received, continuously broadcasting at the public communication frequency until the reply of the slave equipment is received or the configuration mode is exited.
Preferably, in an implementation manner of the present application, after the switching to the new communication frequency negotiated with the slave device and initiating the configuration procedure to the slave device to complete the authentication, the method further includes:
and if the configuration flow completion response sent by the slave equipment is not received within the preset time, switching to the public communication frequency again for broadcasting.
Preferably, in an implementable manner of the present application, the triggering to enter the pairing mode specifically includes:
and triggering a pairing instruction through a key, or detecting and triggering the pairing instruction by a sensor to enter a configuration mode.
Preferably, in an implementation manner of the present application, the switching the communication frequency in the entire communication network according to the communication quality until the communication quality reaches a preset level specifically includes:
and judging the sending reply rate of the data packet under the current communication frequency, and sending a request for entering a packet loss rate evaluation mode to the slave equipment in the communication network when the sending reply rate of the data packet is lower than a first preset threshold value.
Preferably, in an implementation manner of the present application, the switching the communication frequency in the entire communication network according to the communication quality until the communication quality reaches a preset level specifically further includes:
receiving a request response replied by the slave equipment in the communication network, and entering a packet loss rate evaluation mode;
and continuously sending the incremental data packet to the slave equipment in the communication network within a preset time.
Preferably, in an implementation manner of the present application, the switching the communication frequency in the entire communication network according to the communication quality until the communication quality reaches a preset level specifically further includes:
receiving a packet loss rate result obtained by slave equipment in the communication network by inquiring the incremental data packet continuity rate and according to the incremental data packet continuity rate;
and when the circulation is determined to be performed, determining the initial communication frequency at the beginning of the next circulation according to the current packet loss rate result.
Preferably, in an implementation manner of the present application, the determining an initial communication frequency at the beginning of a next cycle according to a current packet loss rate result specifically includes:
and when the packet loss rate result is that the packet loss rate is lower than a second preset threshold value, broadcasting to all slave equipment in the whole communication network, switching to the current communication frequency, and taking the current communication frequency as the initial communication frequency at the beginning of the next cycle.
Preferably, in an implementation manner of the present application, the determining an initial communication frequency at the beginning of a next cycle according to a current packet loss rate result specifically includes:
and when the packet loss rate result is that the packet loss rate is not lower than a second preset threshold value, hopping to a next communication frequency, and taking the next communication frequency as an initial communication frequency at the beginning of the next cycle.
According to a second aspect of the embodiments of the present application, there is provided an apparatus for fast network access and automatic frequency hopping in wireless communication, including:
a processor and a memory;
the processor and the memory are connected through a communication bus:
the processor is used for calling and executing the program stored in the memory;
the memory is configured to store a program for performing at least the method of fast network entry and automatic frequency hopping in wireless communication according to any one of the above.
The technical scheme provided by the application can comprise the following beneficial effects: in the application, when the master device accesses the network, the master device is triggered to enter the pairing mode in a normal working state to start pairing with the slave device. And switching the main equipment to the public communication frequency for broadcasting, wherein the broadcasting comprises preset configured address information or randomly generated address information. And receiving a reply which is carried out after the slave equipment receives the broadcast and is successfully configured according to the address information, wherein the reply comprises the new communication frequency. And switching to a new communication frequency negotiated with the slave equipment, and initiating a configuration flow to the slave equipment to finish authentication. And receiving a configuration flow completion response sent by the slave equipment, and completing the network access with the slave equipment in a matching way. The automatic network access is completed by the self-negotiation protocol between the slave equipment and the master equipment, so that the flexibility of equipment configuration is improved, the equipment can be completely separated from the field support of technicians when in use, and the commercialization is realized. After the network access is finished, the communication frequency is switched in the whole communication network according to the communication quality until the communication quality reaches a preset level, so that the anti-interference of transmission signals is realized.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
Fig. 1 is a flowchart illustrating a method for fast network access and automatic frequency hopping in wireless communication according to an embodiment of the present application;
fig. 2 is a schematic flowchart illustrating a method for fast network access and automatic frequency hopping in wireless communication according to an embodiment of the present application, wherein communication frequencies are switched throughout a communication network according to communication quality until the communication quality reaches a predetermined level;
fig. 3 is a schematic structural diagram of a device for fast network access and automatic frequency hopping in wireless communication according to an embodiment of the present application.
Reference numerals: a processor-21; a memory-22.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
A method for fast network access and automatic frequency hopping in wireless communication, referring to fig. 1, comprising:
s11: triggering to enter a pairing mode in a normal working state;
the pairing mode can be triggered by a key or a sensor detecting a special state triggers the pairing instruction to enter the configuration mode.
The master device and the slave device need to pair one by one for network access, so that the master device and the slave device need to be triggered to enter a pairing mode in a normal working state.
S12: switching to public communication frequency for broadcasting, wherein the broadcasting comprises preset configured address information or randomly generated address information;
after entering the pairing mode, the main device switches to the public communication frequency for broadcasting, and the broadcasting comprises address information preset and configured by technicians or address information randomly generated by the main device.
S13: receiving a reply of the slave equipment after the broadcast is successfully configured according to the address information, wherein the reply comprises a new communication frequency;
if the slave equipment receives the broadcast, the slave equipment can carry out configuration according to the address information contained in the broadcast, obtain a new communication frequency after the configuration is finished, and reply the new communication frequency to the master equipment. The master device receives a reply from the slave device.
If the master device does not receive the reply of the slave device, the slave device is proved not to receive the broadcast, and the master device continuously broadcasts at the public communication frequency until the reply of the slave device is received or the technician operates to exit the configuration mode.
S14: switching to a new communication frequency negotiated with the slave equipment, and initiating a configuration flow to the slave equipment to complete authentication;
because the reply of the slave device contains the new communication frequency, the master device switches to the new communication frequency negotiated with the slave device and initiates a configuration flow to the slave device to complete authentication.
The secondary authentication is performed to verify whether the slave device has a configuration error, and to ensure that the data packet has no transmission error. In general, the master device informs the slave device of the address information by broadcasting at the common frequency, and the slave replies to the address information, which indicates that the master device and the slave device have negotiated a new communication frequency. And if the two parties enter the new communication frequency for secondary verification, if a secondary verification mechanism under the new communication frequency is not available, once the slave equipment is configured wrongly, the slave equipment is in a state of unknown address, the master equipment does not know the new address of the slave equipment, and the address sent by the slave equipment is also not received by people.
S15: receiving a configuration flow completion response sent by the slave equipment, and completing pairing network access with the slave equipment;
and the master equipment receives the configuration flow completion response sent by the slave equipment, proves that the slave equipment is correctly configured, can normally communicate and completes the pairing and network access with the slave equipment. Both sides continue to maintain normal working state.
If the master device does not receive the configuration flow completion response sent by the slave device within the preset time, it is proved that the slave device is possible to make a configuration error, and the master device switches to the public communication frequency again to wait for the broadcast of the new address packet for broadcasting until the reply of the slave device is received or a technician operates to exit the configuration mode.
In this embodiment, when the master device accesses the network, the master device triggers the pairing mode to start pairing with the slave device in a normal working state. And switching the main equipment to the public communication frequency for broadcasting, wherein the broadcasting comprises preset configured address information or randomly generated address information. And receiving a reply which is carried out after the slave equipment receives the broadcast and is successfully configured according to the address information, wherein the reply comprises the new communication frequency. And switching to a new communication frequency negotiated with the slave equipment, and initiating a configuration flow to the slave equipment to finish authentication. And receiving a configuration flow completion response sent by the slave equipment, and completing the network access with the slave equipment in a matching way. The automatic network access is completed by the self-negotiation protocol between the slave equipment and the master equipment, so that the flexibility of equipment configuration is improved, the equipment can be completely separated from the field support of technicians when in use, and the commercialization is realized.
S16: switching the communication frequency in the whole communication network according to the communication quality until the communication quality reaches a preset level.
After the network access is finished, the main equipment switches the communication frequency in the whole communication network according to the communication quality until the communication quality reaches a preset level, and the anti-interference of transmission signals is realized.
Referring to fig. 2, the method specifically includes:
s161: judging the sending reply rate of a data packet under the current communication frequency, and sending a request for entering a packet loss rate evaluation mode to slave equipment in a communication network when the sending reply rate of the data packet is lower than a first preset threshold value;
the first preset threshold is a data packet sending reply rate threshold, the data packet sending reply rate is low when the first preset threshold is lower than the first preset threshold, and the data packet sending reply rate is normal when the first preset threshold is not lower than the first preset threshold.
In this embodiment, the communication frequency is switched in the whole communication network according to the communication quality until the communication quality reaches a preset level, and only the slave device and the master device need to be determined to be in a communication state, and whether the slave device and the master device are paired does not need to be concerned.
In the prior art, the communication quality is generally expressed by the packet loss rate. The master device judges the data packet sending reply rate under the current communication frequency, and when the data packet sending reply rate is lower than a first preset threshold value, the communication quality is judged to be poor. The master device sends a request for entering a packet loss rate evaluation mode to a communicable slave device in a communication network.
S162: receiving a request response replied by slave equipment in a communication network, and entering a packet loss rate evaluation mode;
and if the master equipment receives a request response replied by the slave equipment in the communication network, entering a packet loss rate evaluation mode.
If the master device does not receive the reply request response of the slave device in the communication network, continuously sending a request for entering a packet loss rate evaluation mode to the slave device in the communication network until the reply request response of the slave device in the communication network is received.
S163: continuously sending an incremental data packet to slave equipment in a communication network within preset time;
after entering the packet loss rate evaluation mode, an incremental data packet, such as a digital incremental data packet 001002003004005006007008009, is continuously sent to the slave devices in the communication network within a preset time, and the packet loss rate can be determined through the incremental mechanism.
The continuous transmission within the preset time is to prevent the slave device from receiving incomplete incremental data packets.
S164: receiving a packet loss rate result obtained by slave equipment in a communication network by inquiring the incremental data packet continuity rate and according to the incremental data packet continuity rate;
after receiving the incremental data packet, the slave device queries the incremental data packet continuity rate, for example, the above-mentioned digital incremental data packet 001002003004005006007008009, and if the incremental data packet obtained by the slave device query is 001002003004005006007008009, it proves that there is no packet loss. If the incremental data packet obtained by the slave device query is 001002003004005006008009, it is proved that the packet loss rate is low by detecting the packet lacking the reference number 007. If the incremental data packet obtained by the slave device query is 002006008, the packet loss rate is proved to be higher by detecting the packet lacking the number bit 001003004005007009. And the slave equipment obtains a packet loss rate result according to the incremental data packet continuity rate and sends the packet loss rate result to the master equipment.
S165: and when the circulation is determined to be performed, determining the initial communication frequency at the beginning of the next circulation according to the current packet loss rate result.
And when the cycle is determined to be performed, the primary equipment determines the initial communication frequency at the beginning of the next cycle according to the current packet loss rate result.
The method specifically comprises the following steps:
s1651: and when the packet loss rate result is that the packet loss rate is lower than a second preset threshold value, broadcasting to all the slave devices in the whole communication network, switching to the current communication frequency, and taking the current communication frequency as the initial communication frequency at the beginning of the next cycle.
The second preset threshold is a packet loss rate threshold, the packet loss rate is lower if the second preset threshold is lower, and the packet loss rate is higher if the second preset threshold is not lower.
And when the packet loss rate result shows that the packet loss rate is lower than a second preset threshold, the packet loss rate is lower, the communication quality under the current communication frequency is higher, and the communication is stable. The current communication frequency can be maintained, so that the master device broadcasts in the whole communication network to all the slave devices to switch to the current communication frequency, and the master device also maintains the current communication frequency. And returning to step S161, continuing to determine the data packet sending reply rate at the current communication frequency, and sending a request for entering a packet loss rate evaluation mode to the slave device in the communication network when the data packet sending reply rate is lower than the first preset threshold, and executing a loop.
At this time, the slave device also enters a normal operating state.
S1652: and when the packet loss rate result is that the packet loss rate is not lower than a second preset threshold value, hopping to a next communication frequency, and taking the next communication frequency as an initial communication frequency at the beginning of the next cycle.
And when the packet loss rate result is that the packet loss rate is not lower than a second preset threshold, it is proved that the packet loss rate is higher, the communication quality under the current communication frequency is lower, and the communication is unstable, and then the communication needs to be switched to other communication frequencies. And when receiving a packet loss rate result that the packet loss rate is not lower than a second preset threshold value, the master device hops to the next communication frequency and responds to the slave device in current communication. The slave device also hops to the next communication frequency after receiving the reply.
After the master device hops to the next communication frequency, the process returns to step S161, the sending reply rate of the data packet under the current communication frequency is continuously determined, and when the sending reply rate of the data packet is lower than the first preset threshold, a request for entering the packet loss rate evaluation mode is sent to the slave device in the communication network, and a loop is executed.
In this embodiment, the master device maintains the communication quality at the current communication frequency when the communication quality is high, and switches to another communication frequency when the communication quality at the current communication frequency is low until the communication quality at the newly switched communication frequency is high, and maintains the communication quality. Namely, the communication frequency is switched in the whole communication network according to the communication quality until the communication quality reaches a preset level, so that the anti-interference of transmission signals is realized.
An apparatus for fast network access and automatic frequency hopping in wireless communication, comprising:
a processor 21 and a memory 22;
the processor 21 is connected to the memory 22 by a communication bus:
the processor 21 is configured to call and execute a program stored in the memory 22;
the memory 22 is used for storing a program, and the program is at least used for executing the method for fast network access and automatic frequency hopping in wireless communication in any of the above embodiments.
The device in this embodiment is the master device in the above embodiment.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that, in the description of the present application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present application, the meaning of "a plurality" means at least two unless otherwise specified.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and the scope of the preferred embodiments of the present application includes other implementations in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present application.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (10)
1. A method for fast network access and automatic frequency hopping in wireless communication is characterized by comprising the following steps:
triggering to enter a pairing mode in a normal working state;
switching to public communication frequency for broadcasting, wherein the broadcasting comprises preset configured address information or randomly generated address information;
receiving a reply of the slave equipment after the broadcast is successfully configured according to the address information, wherein the reply comprises a new communication frequency;
switching to a new communication frequency negotiated with the slave equipment, and initiating a configuration flow to the slave equipment to finish authentication;
receiving a configuration flow completion response sent by the slave equipment, and completing pairing and network access with the slave equipment;
switching communication frequency in the whole communication network according to the communication quality until the communication quality reaches a preset level.
2. The method of claim 1, wherein after switching to a common communication frequency for broadcast, the method further comprises:
and if the reply of the slave equipment is not received, continuously broadcasting at the public communication frequency until the reply of the slave equipment is received or the configuration mode is exited.
3. The method of claim 2, wherein after the switching to the new communication frequency negotiated with the slave device and initiating the configuration procedure to the slave device and completing the authentication, the method further comprises:
and if the configuration flow completion response sent by the slave equipment is not received within the preset time, switching to the public communication frequency again for broadcasting.
4. The method of claim 3, wherein the triggering entry into the pairing mode specifically comprises:
and triggering a pairing instruction through a key, or detecting and triggering the pairing instruction by a sensor to enter a configuration mode.
5. The method according to claim 1, wherein said switching communication frequencies throughout the communication network according to communication quality until the communication quality reaches a predetermined level, comprises:
and judging the sending reply rate of the data packet under the current communication frequency, and sending a request for entering a packet loss rate evaluation mode to the slave equipment in the communication network when the sending reply rate of the data packet is lower than a first preset threshold value.
6. The method of claim 5, wherein switching communication frequencies throughout the communication network according to communication quality until the communication quality reaches a predetermined level, further comprises:
receiving a request response replied by the slave equipment in the communication network, and entering a packet loss rate evaluation mode;
and continuously sending the incremental data packet to the slave equipment in the communication network within a preset time.
7. The method of claim 6, wherein switching communication frequencies throughout the communication network according to communication quality until the communication quality reaches a predetermined level, further comprises:
receiving a packet loss rate result obtained by slave equipment in the communication network by inquiring the incremental data packet continuity rate and according to the incremental data packet continuity rate;
and when the circulation is determined to be performed, determining the initial communication frequency at the beginning of the next circulation according to the current packet loss rate result.
8. The method according to claim 7, wherein the determining the initial communication frequency at the beginning of the next cycle according to the current packet loss rate result specifically includes:
and when the packet loss rate result is that the packet loss rate is lower than a second preset threshold value, broadcasting to all slave equipment in the whole communication network, switching to the current communication frequency, and taking the current communication frequency as the initial communication frequency at the beginning of the next cycle.
9. The method according to claim 7, wherein the determining an initial communication frequency at the beginning of a next cycle according to the current packet loss rate result further includes:
and when the packet loss rate result is that the packet loss rate is not lower than a second preset threshold value, hopping to a next communication frequency, and taking the next communication frequency as an initial communication frequency at the beginning of the next cycle.
10. An apparatus for fast network access and automatic frequency hopping in wireless communication, comprising:
a processor and a memory;
the processor and the memory are connected through a communication bus:
the processor is used for calling and executing the program stored in the memory;
the memory for storing a program for performing at least the method of fast network entry and automatic frequency hopping in wireless communication according to any one of claims 1 to 9.
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| CN113423084A (en) * | 2021-06-22 | 2021-09-21 | 欧梯恩智能科技(苏州)有限公司 | LoRa gateway and equipment pairing arrangement method and application in bridge pier impact detection |
| CN113423084B (en) * | 2021-06-22 | 2022-02-22 | 欧梯恩智能科技(苏州)有限公司 | LoRa gateway and equipment pairing arrangement method and application in bridge pier impact detection |
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