CN110233642A - Optimize the power carrier communication system and method for coverage area - Google Patents
Optimize the power carrier communication system and method for coverage area Download PDFInfo
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- CN110233642A CN110233642A CN201910480728.1A CN201910480728A CN110233642A CN 110233642 A CN110233642 A CN 110233642A CN 201910480728 A CN201910480728 A CN 201910480728A CN 110233642 A CN110233642 A CN 110233642A
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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
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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
- H04B1/715—Interference-related aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
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Abstract
Optimize the power carrier communication system and method for coverage area, realize strong antijamming capability, communication context covers wide power carrier communication, it include: repeater and terminal, repeater is mounted on power line, repeater is for receiving terminal signaling and sending signal to terminal, and repeater configurations are that terminal is judged according to communication time at a distance from itself, and repeater configurations are to carry out frequency hopping communication with terminal at a distance from itself according to terminal.
Description
Technical field
The present invention relates to a kind of communication system and method, in particular to a kind of power carrier communication system for optimizing coverage area
System and method.
Background technique
Power line carrier communication (power line carrier communication) is using transmission line of electricity as carrier signal
Transmission medium communication of power system.Since transmission line of electricity has a very firm support construction, and sets up 3 or more and lead
Body (generally has three-phase good conductor and one or two aerial earth wire), thus power transmission line convey power current while, with transmission
Carrier signal, it is not only economical but also very reliable.This comprehensive utilization early has become the spy that all power departments preferentially use in the world
There is means of communication.
A most basic task is exactly different according to the different selections of communication channel in power-line carrier communication system
Modulation system.
In general, baseband signal contains DC component and the lower frequency component of frequency, tends not to believe as transmission
It directly transmits number in the channel, therefore, it is necessary to which baseband signal is transformed into very high band for an opposite baseband frequency
Messenger (modulated signal) is to be suitable for transmission.
The quality of one communication system is largely dependent upon used modulation system.In order to make signal when modulation
Feature matches with channel characteristics, and therefore, the selection of modulation system is determined by the characteristic of channel in system.Significantly different class
The channel characteristics of type, will accordingly there is different types of modulation systems.
In the method that general power carrier communication uses, due to the presence of transformer, transformer understands isolation signals, so
An independent communication zone is formd under each transformer, outer signals can not be passed to, therefore the equipment in the region
Between can communicate with each other.
Installing terminal equipment is on power line, but due to mutually isolated between phase and phase, so needing to fill on power line
Upper repeater, all phase lines of repeater connection.
The modulation system that power carrier communication relies at this stage has the disadvantage that:
There are itself because of the impulse disturbances that have for power line.Alternating current used at present has 50HZ and 60HZ, then the period be
There are two minor peaks in each ac cycle in 20ms and 16.7ms, and two minor peaks can bring impulse disturbances twice, i.e. electric power
There are fixed 100HZ or 120HZ impulse disturbances, interference time about 2ms on line, therefore interference must be pocessed；
When the same communications zone needs to communicate with each other there are multiple communication apparatus, once these equipment are run simultaneously,
It will generate interference from each other, influence communication quality；
Power line causes high reduction to carrier signal.When load is very heavy on power line, line impedance up to 1 ohm with
Under, it causes to cut down the height of carrier signal.In practical application, when power line zero load, point-to-point carrier signal can be transferred to several
Kilometer.But when load is very heavy on power line, tens meters can only be transmitted.
Summary of the invention:
The present invention by provide optimization coverage area power carrier communication system and method, solve the above problems in one
It is a or multiple.
Optimize the power carrier communication system of coverage area, comprising: at least one repeater, repeater are mounted on power line
On, repeater is used to receive terminal signaling and sends signal to terminal, when repeater configurations are that record is completed used in communication
Between information, repeater configurations be according to terminal and itself communication time and terminal carry out frequency hopping communication.
Frequency hopping is used between repeater and terminal, using the jamproof feature of frequency hopping, is excluded on power line
Other interference, guarantee communication quality.
In some embodiments, in system there are two or more repeaters, pass through fixed frequency between repeater
Communication.
In some embodiments, in system there are three or more repeaters, cascade side is used between repeater
Formula is communicated.
Fixed communication frequency simultaneously cooperates cascade mode, it is ensured that two also can be carried out stabilization apart from farther away repeater
Communication.
In some embodiments, repeater screens in affiliated area according to the frequency and threshold value of the terminal signaling received
Terminal, repeater determines all terminals in affiliated area according to communication time, and determines topological structure.
Multiple repeaters and communicating terminal can be distributed in a communication context, it must be determined that could be really after topological structure
Under region belonging to each fixed repeater, there is which terminal device to need to be communicated by the repeater.
Optimize the power carrier communication system of coverage area, comprising: at least one terminal, terminal are configured to according to repeater
Instruction requires to send signal to repeater, wherein includes self ID in signal, and terminal is configured to receive repeater signal, wherein in
After the communication time information in device signal including oneself and repeater, terminal determines frequency hopping communication side according to communication time information
Method carries out frequency hopping communication between terminal and repeater.
Frequency hopping is used between repeater and terminal, using the jamproof feature of frequency hopping, is excluded on power line
Other interference, guarantee communication quality.
In some embodiments, when, there are when multiple repeaters, terminal is determined with according to communication time information in system
The repeater nearest from itself, then carries out frequency hopping communication with it.
Distance is closer, and interference is fewer, and communication quality is better.
Optimize the power carrier communication method of coverage area, comprising the following steps:
S1: repeater sends command signal to all terminal devices, and command signal requires to include, initial plant number, communication
Interval, acquisition table number instruction；
S2: the terminal in all phase lines receives command signal, parses device number ID, and calculates the upload table number of oneself
Moment；
S3: terminal requires to send signal to repeater according to instruction, includes self ID in signal；
S4: repeater receives terminal signaling, and repeater stores signal message, and stores complete communication communication used simultaneously
Time；
S5: repeater sends communication time information to all terminals, and terminal receives communication time information；
S6: repeater and terminal foundation communication time information determine frequency-hopping method；
S7: frequency hopping communication is carried out according to frequency-hopping method between repeater and terminal.
Frequency hopping is used between repeater and terminal, using the jamproof feature of frequency hopping, is excluded on power line
Other interference, guarantee communication quality.
In some embodiments, it is communicated between repeater and terminal using fixed frequency point in step S1~S5.
Before not determining frequency-hopping method, need to be communicated by fixed frequency between repeater and terminal.
In some embodiments, after step S4, further includes:
S41: repeater determines the terminal in communication context according to the frequency and threshold value that receive signal；
S42: after repeater determines the terminal in communication context, the terminal belonged in one's respective area is determined according to communication time,
Form topological structure.
Multiple repeaters and terminal can be distributed in a communication context, it must be determined that topological structure, repeater ability
Mutual distribution terminal determines the terminal device in respective affiliated area, forms the topology that a repeater connects multiple terminals.
In some embodiments, after step S6, further includes:
S61: terminal determines the repeater nearest apart from oneself, and as the communication object of oneself.
Terminal is also required to determine the frequency hopping Repeater with oneself.
In some embodiments, when there is multiple repeaters in system, after step S7, further includes:
S8: it is communicated between repeater using fixed frequency；
When communication range is larger, needs to dispose multiple repeaters, communicated between repeater by fixed frequency, with
Expand communication range.
In some embodiments, when in system there are three or more repeaters, after step S7, further includes:
S8: repeater 1 and repeater 2 determine communication frequency point F12, and communication frequency point is determined between repeater 2 and repeater 3
F23 ... ... determines communication frequency point F (n) (n+1) between communicator n and communicator n+1；
S9: it is communicated between any two repeater by cascade mode.
When repeater is communicated using fixed frequency, communication range is limited, it is therefore desirable to be expanded by cascade mode logical
Believe range.
The utility model has the advantages that
The present apparatus is not necessarily to calculate practical by the distance for calculating the communication time between repeater and terminal to judge distance
Distance, and frequency hopping connection type is determined by communication time, is carrying out frequency hopping communication connection according to which.
Frequency hopping is one of most common spread spectrum mode, its working principle is that refer to receiving-transmitting sides transmission signal carrier frequency by
The communication mode of Discrete Change is carried out according to predetermined rule, that is to say, that carrier frequency used in communication is changed code by pseudorandom
Control and random jump.For the implementation of the communication technology, " frequency hopping " is a kind of to carry out multifrequency frequency displacement key with code sequence
The communication mode of control and the communication system of a kind of yard of control carrier frequency jump.Frequency hopping communications has good anti-interference ability, even if
There is part frequency point disturbed, remains to normally be communicated on the frequency point that other are not disturbed.
Therefore, it for power carrier communication, is limited by communication context, once communication distance is too long, route
In interference will become more, so can improve its interference by frequency hopping communication, increasing communication context simultaneously improves communication quality.
System and method can be very good to solve the problems in power carrier communication:
For peak pulse interference, the fixed frequency range of interference is 100HZ or 120HZ, and this interference is for frequency hopping
It is the interference of part frequency point for communication, large effect can not be generated to it；
Due to using different frequency-hopping modes between repeater and different terminals, it is greatly reduced its shadow interfered with each other
It rings；
For large range of power communication system, even if the load on route is larger, carrier wave receives reduction, can also
Solve the problems, such as that larger range communicates by the repeater cascade connection of multiple relatively short distances.
Detailed description of the invention:
Fig. 1 is repeater and terminal connection schematic diagram in the power carrier communication system of present invention optimization coverage area.
Fig. 2 is repeater and the signal of the communication means of terminal in the power carrier communication method of present invention optimization coverage area
Figure.
Fig. 3 is multi-repeater connection schematic diagram in the power carrier communication system of present invention optimization coverage area.
Fig. 4 is multi-repeater communication means schematic diagram in the power carrier communication method of present invention optimization coverage area.
Fig. 5 is distance exam schematic illustration in the power carrier communication method of present invention optimization coverage area.
Specific embodiment
In order to make those skilled in the art more fully understand application scheme, below in conjunction in the embodiment of the present application
Attached drawing, the technical scheme in the embodiment of the application is clearly and completely described, it is clear that described embodiment is only
The embodiment of the application a part, instead of all the embodiments.Based on the embodiment in the application, ordinary skill people
Member's every other embodiment obtained without making creative work, all should belong to the model of the application protection
It encloses.
It should be noted that the description and claims of this application and term " first " in above-mentioned attached drawing, "
Two " etc. be to be used to distinguish similar objects, without being used to describe a particular order or precedence order.It should be understood that using in this way
Data be interchangeable under appropriate circumstances, so as to embodiments herein described herein.In addition, term " includes " and " tool
Have " and their any deformation, it is intended that cover it is non-exclusive include, for example, containing a series of steps or units
Process, method, system, product or equipment those of are not necessarily limited to be clearly listed step or unit, but may include without clear
Other step or units listing to Chu or intrinsic for these process, methods, product or equipment.
Term " installation ", " setting ", " being equipped with ", " connection ", " connected ", " socket " shall be understood in a broad sense.For example, it may be
It is fixedly connected, is detachably connected or monolithic construction；It can be mechanical connection, or electrical connection；It can be directly connected, or
Being or is two connections internal between device, element or component indirectly connected through an intermediary.For ability
For the those of ordinary skill of domain, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
Specific embodiment 1:
As shown in Figure 1, 2, a repeater is installed in the electric power range of a transformer, and it is allowed to correspond to multiple ends
End.For example, realization manually controls its opening and closing if necessary to the street lamp in control school or cell.
Repeater is installed on three-phase circuit, all three-phase phase lines of repeater connection are equipped with difference on different quadrants
Terminal (in this scene be road lamp switch controller), due in the power circuit under the transformer without others power communications
Equipment, so the repeater and other terminals constitute the communication system in the region.
When needing group-net communication, system is communicated by following steps:
S1: repeater sends command signal to all terminal devices, and command signal requires to include, initial plant number, communication
Interval, acquisition table number instruction；
S2: the terminal in all phase lines receives command signal, parses device number ID, and calculates the upload table number of oneself
Moment；
S3: terminal requires to send signal to repeater according to instruction, includes self ID in signal；
S4: repeater receives terminal signaling, obtains communication time information；
S5: repeater sends communication time information to all terminals, and terminal receives communication time information；
S6: repeater and terminal foundation communication time information determine frequency-hopping method；
S7: frequency hopping communication is carried out according to frequency-hopping method between repeater and terminal.
The above communication mode is divided into two Main Stages, and the first stage is S1~S5, and repeater and terminal needs mutually communicate
Letter is to determine distance (i.e. communication time) and communication mode, and the communication frequency between repeater and terminal is fixed at this time, the frequency
For the carrier wave fundamental frequency of repeater.
Second stage is S6~S7, and frequency-hopping mode is determined between repeater and terminal, carries out frequency hopping communication, frequency hopping communications
Mode are as follows:
On the basis of repeater carrier wave fundamental frequency Fx, the M frequency point and incremental change m under fundamental frequency are determined.
UE (terminal device) and Relay (relaying) all have a stepping counter, for generating local time information, lead to
It crosses feedback shift register (LFSR) and generates next frequency point.Stepping counter includes clock counter, time slot counter and frame
Counter.Clock counter is used to record the clock number in each time slot；Time slot counter is according to the carry of clock counter
Label is counted, and the number of time slots in each frame is recorded；Frame counter is for recording frame number, as local time information value.
Real-time communication data frame is divided into several time slots and is sent, including 1 synchronization time slot and several business
Time slot.Transmitting terminal temporal information, the significant figure that storage needs to transmit in business time-slot data packet are stored in synchronization time slot data packet
According to.During synchronization time slot, receiving end receives the temporal information from transmitting terminal, is corrected to local time information, to point
Grade counter is zeroed out, and uses initial value of the temporal information value received as feedback shift register.In business
During gap, transmitting terminal and receiving end guarantee the frequency hopping at transmitting-receiving both ends by respective feedback shift register displacement update frequency point
Communication mode is consistent, realizes frequency-hopping synchronization.
Specific embodiment 2:
As shown in Figure 3,4, the communication context faced when power carrier communication is larger, i.e., a repeater can not cover whole
Terminal, then need multiple repeaters and multiple terminals to cooperate, form comprehensive covering of communication context.
By repeater distributing installation when installation, by fixed frequency for communication between repeater and repeater, therefore install
When guarantee the distance between repeater and repeater in communication range, the fixed responsible panel region of each repeater, region
Interior all terminals all with this repeater communication.
Because there are multiple repeaters and terminals in communication network, it is necessary first to repeater identification network, in embodiment 1
On the basis of, after step S4, further includes:
S41: repeater determines the terminal in communication context according to the frequency and threshold value that receive signal；
S42: after repeater determines the terminal in communication context, the terminal belonged in one's respective area is determined according to distance, is formed
Topological structure.
The high-frequency signal of carrier communication is normally carried on voltage signal, and under the same transformer, the voltage of every phase is believed
Variation less (electric current difference is larger), the theoretical basis of carrier-wave transmission is done with this on number waved theory.
But with the difference of distance, the high-frequency signal carried on alternating voltage can have the decaying or dry of detail with distance
It disturbs.Wherein decaying determines distance；Interfere then determining area (each repeater is a region).
Therefore, repeater is set with the presence or absence of terminal during received with receiving frequency and the threshold value of signal really
It is standby, and judge whether to belong to one's respective area according to communication time information.
After each repeater has determined the terminal in one's respective area, just specify the topological structure of communication network, i.e., it is more
The combination of a star topology.
Terminal is also required to the determining repeater with self communication, therefore on the basis of embodiment 1 also:
Step S61: terminal determines the repeater nearest apart from oneself, and as the communication object of oneself.
So far, each equipment in all networks completes networking work.
When communication, each repeater has different frequency points, there is N number of repeater under some scene, then the fundamental frequency of repeater
For F1, F2 ... .Fn；
UE determined connect nearest Relay Fx after, it is determined that connection fundamental frequency.Fundamental frequency has M frequency point up and down, generally
For next frequency point is incremented by with HZ.
If the fundamental frequency of a certain repeater is 22.5KHZ, each increasing frequency is 2.25KHZ, then the letter near the fundamental frequency
Number frequency point has:
(22.5K-2.25*4K)HZ、
(22.5K-2.25*3K)HZ、
(22.5K-2.25*3K)HZ、
(22.5K-2.25*1K)HZ
(22.5K)HZ
(22.5K+2.25*1K)HZ
(22.5K+2.25*2K)HZ
(22.5K+2.25*3K)HZ
(22.5K+2.25*4K)HZ
The signal frequency point of terminal room in repeater and affiliated area passed through under fundamental frequency 22.5KHZ and the fundamental frequency
Carry out frequency hopping communications.
Specific embodiment 3:
Due to the communication between repeater using fixed frequency, so communication range between repeater still can be by
To limitation.
Therefore, if communication range is compared to 2 further expansion of embodiment, there are direct communications between certain two repeater
Quality it is bad.
Then, on the basis of specific embodiment 2, there are also steps:
S8: repeater 1 and repeater 2 determine communication frequency point F12, and communication frequency point is determined between repeater 2 and repeater 3
F23 ... ... determines communication frequency point F (n) (n+1) between communicator n and communicator n+1；
S9: it is communicated between any two repeater by cascade mode.
Specific in application scenarios:
As shown in figure 3, when being communicated using cascade system:
Example 1: assuming that application scenarios are the street lamp on a route, then what multiple inter-repeaters were presented is linear distribution,
That is sequence arrangement of the physical layer repeater by power line one by one.
There are repeater 1, repeater 2, repeater 3 ... repeater n on the power line of street lamp, when communication:
Repeater 1 --- repeater 2, fixed frequency point F1；
Repeater 2 --- repeater 3, fixed frequency point F2；
Repeater n-1 --- repeater n, fixed frequency point Fn-1；
When repeater 1 is communicated with repeater 3, need to be communicated by repeater 3, i.e. repeater 1 --- repeater
2 --- repeater 3.
Example 2: assuming that two communications zones again in application scenarios, are respectively present repeater 1 and repeater 3 are responsible for the region,
But since distance limitation repeater 1 and repeater 3 can not be directly connected to by fixed frequency point.It then needs in repeater 1 in
After increasing repeater 3, at this time communication system between device 2 are as follows:
Repeater 1 --- repeater 2 --- repeater 3
Increased repeater 2 is common higher level's repeater of repeater 1 and repeater 3.
On this basis, if there is also other identical cascade systems in communication system, such as: there are repeaters
5 --- repeater 6 --- repeaters 7, but between repeater 6 and repeater 2 can not direct communication, then need on this basis
Increase repeater 8, the common higher level as repeater 2 and repeater 6.
When repeater 1 is communicated with repeater 5, communication link are as follows:
--- --- repeater 8 --- repeater 6 --- repeater 5 of repeater 2 of repeater 1.
Specific embodiment 4:
The communication time of terminal and repeater is equivalent to range information.
Carrier communication is to transmit data in a wired fashion in a manner of low-voltage power supply, therefore by taking Fig. 5 as an example, different is set
It is standby, establish communication when, entire communication process Ta+Tb+Tc total time be it is different, based on this, repeater is to have communicated
Corresponding range range mode is equivalent at the time to complete nearest power equipment ID number acquisition, and stored.
Assume that a basic communication time is 1ms, repeater sends signal to terminal, and then terminal is sent out to repeater again
The number of delivering letters, the total time of this process are 2.3ms, then the distance between terminal and repeater are 2.3ms, do not need practical calculating
The distance between repeater and terminal, repeater are that can determine whether the distance of distance by the time data.
The above statement is only preferred embodiment of the invention, it is noted that those skilled in the art, not
Under the premise of being detached from the invention design, various modifications and improvements can be made, these also should be regarded as protection of the invention
Range.
Claims (10)
1. optimizing the power carrier communication system of coverage area characterized by comprising
At least one repeater, the repeater are mounted on power line；
For the repeater for receiving terminal signaling and sending signal to terminal, the repeater configurations are to record the relaying
Device and terminal complete communication communication time used；
The repeater configurations are to carry out frequency hopping communication according to terminal and the communication time of itself and terminal.
2. optimizing the power carrier communication system of coverage area according to claim 1, it is characterised in that:
Pass through fixed frequency there are the two or more repeaters in the system, between the repeater to communicate；
When there are when three or more the repeaters, being carried out between the repeater using cascade mode in the system
Communication.
3. optimizing the power carrier communication system of coverage area according to claim 2, it is characterised in that:
The repeater screens the terminal in affiliated area according to the frequency and threshold value of the terminal signaling received；
The repeater determines all terminals in affiliated area according to communication time, and determines topological structure.
4. optimizing the power carrier communication system of coverage area characterized by comprising
At least one terminal, the terminal is configured to be instructed according to repeater and requires to send signal to repeater, wherein in signal
Include self ID；
The terminal is configured to receive repeater signal, wherein includes the communication time of oneself and repeater in repeater signal；
The terminal determines the frequency hopping means of communication according to communication time, and frequency hopping communication is carried out between the terminal and repeater.
5. optimizing the power carrier communication system of coverage area according to claim 4, it is characterised in that:
When in the system there are when multiple repeaters, the terminal with according to the determining relaying nearest from itself of temporal information
Device；
The terminal carries out frequency hopping communication with apart from nearest repeater.
6. optimizing the power carrier communication method of coverage area, which comprises the following steps:
S1: repeater sends command signal to all terminal devices, and command signal requires to include, initial plant number, communication interval,
Acquire table number instruction；
S2: the terminal in all phase lines receives command signal, parses device number ID, and when calculating the upload table number of oneself
It carves；
S3: terminal requires to send signal to repeater according to instruction, includes self ID in signal；
S4: repeater receives terminal signaling, and repeater stores signal message, and is stored when completing the used communication of communication simultaneously
Between.
S5: repeater sends communication time information to all terminals, and terminal receives communication time information；
S6: repeater and terminal foundation communication time information determine frequency-hopping method；
S7: frequency hopping communication is carried out according to frequency-hopping method between repeater and terminal.
It is communicated between repeater and terminal using fixed frequency point in the step S1~S5.
7. according to claim 6 optimize coverage area power carrier communication method, which is characterized in that the step S4 it
Afterwards, further includes:
S41: repeater determines the terminal in communication context according to the frequency and threshold value that receive signal；
S42: after repeater determines the terminal in communication context, the terminal belonged in one's respective area is determined according to communication time information,
Form topological structure.
8. according to claim 6 optimize coverage area power carrier communication method, which is characterized in that the step S6 it
Afterwards, further includes:
S61: terminal determines the repeater nearest apart from oneself, and as the communication object of oneself.
9. optimizing the power carrier communication method of coverage area according to claim 6, which is characterized in that more when having in system
A repeater, after the step S7, further includes:
S8: it is communicated between repeater using fixed frequency.
10. optimizing the power carrier communication method of coverage area according to claim 6, which is characterized in that when being deposited in system
After three or more repeaters, the step S7, further includes:
S8: repeater 1 and repeater 2 determine communication frequency point F12, and communication frequency point is determined between repeater 2 and repeater 3
F23 ... ... determines communication frequency point F (n) (n+1) between communicator n and communicator n+1；
S9: it is communicated between any two repeater by cascade mode.
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| CN105790889A (en) * | 2016-02-23 | 2016-07-20 | 北京杰睿中恒科技有限公司 | Data transmission method and device based on orthogonal frequency division multiplexing and meter reading system |
| CN108023613A (en) * | 2017-10-31 | 2018-05-11 | 杭州华立电力系统工程有限公司 | Carrier communication module detection device and carrier communication module detection method |
| CN109756245A (en) * | 2017-11-08 | 2019-05-14 | 杭州海兴电力科技股份有限公司 | Multifrequency point frequency-hopping communication method based on power line carrier |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117037416A (en) * | 2023-08-18 | 2023-11-10 | 深圳前海奥瑞那安全技术有限公司 | Front-end and background linkage response operation and maintenance control system and method |
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