CN103138801A - Device and method for automatic switching of narrow-band power line carrier and micro-power wireless binary channel - Google Patents
Device and method for automatic switching of narrow-band power line carrier and micro-power wireless binary channel Download PDFInfo
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Abstract
The invention discloses a device and a method for automatic switching of a narrow-band power line carrier and a micro-power wireless binary channel and relates to the technical field of communication. The device comprises a first detection module (10), a second detection module (20) and a channel selection module (30). The first detection module (10) and the second detection module (20) are respectively connected with the channel selection module (30). The method comprises the steps: (1) signal receiving strength on a carrier channel and received signal strength on a wireless channel are respectively detected by the first detection module and the second detection module; (2) the two types of detected signal strength are compared with a preset threshold value by the channel selection module; and (3) automatic switching is achieved. According to the device and the method for automatic switching of the narrow-band power line carrier and the micro-power wireless binary channel automatic switching, binary channel communication is offered to smart power grid automatic data logging; efficient and safe information communication is effectively guaranteed so that high real logging rate and high accurate rate are achieved and the device and the method are suitable for being used in an automatic data logging system, an internet of things, a smart home and a smart building, a home network system, a home automatic system, a security and protection system and the like.
Description
Technical field
The present invention relates to communication technique field, relate in particular to the wireless double-channel automatic switching control equipment of a kind of arrowband power line carrier and micropower and method.
Background technology
Existing communication channel is all single mode.Current electricity consumption extraction system is mainly to adopt arrowband power line carrier and the wireless single communication mode of micropower, and this wherein uses again the widest with the arrowband power line carrier communication, is mainly used in minority some areas before the micropower Psamminida.And the communication mode of these two kinds of single channels has defective separately:
The arrowband power line carrier is to rely on existing electric power resource to carry out transfer of data, because low-voltage power line is used for electric energy transmitting, so the communication environment of power line is very abominable, noise pollution is serious, and the arrowband power line carrier communication can be affected by electric network noise, impedance and harmonic wave etc.
Micropower is wireless is to carry out transfer of data by the space electromagnetic wave, and installation environment is had higher requirement, responsive and blocked by building to affect large on direction; Due to the making rapid progress of modern development in science and technology, Wireless Telecom Equipment has obtained extensive utilization in addition, and the electromagnetic pollution in space is also more and more serious, and this also has a strong impact on the collection success rate.
Summary of the invention
Purpose of the present invention just is to overcome the shortcoming and defect that prior art exists, the wireless double-channel automatic switching control equipment of a kind of arrowband power line carrier and micropower and method are provided, make the both independent parallel work mutually of two interchannels, cooperation mutually again simultaneously, automatically switch, given play to the advantage of each self-channel.
The object of the present invention is achieved like this:
One, the wireless double-channel automatic switching control equipment of power line carrier and micropower (abbreviation device)
This device comprises first detection module, the second detection module and channel selection module;
First detection module be connected detection module and select module to be connected with channel respectively.
Two, the wireless double-channel automatic switching method of power line carrier and micropower (abbreviation method)
This method comprises the following steps:
1. first detection module detects the received signal strength on carrier channel, and the second detection module detects the received signal strength on wireless channel;
2. channel two kinds of signal strength signal intensities and the predetermined threshold value of selecting that module will detect compares;
A, the first comparison module:
Greater than threshold value W1, select wireless channel when the wireless channel received signal strength;
B, the second comparison module:
When the wireless channel received signal strength during greater than threshold value W2 and less than threshold value W1,
If a carrier channel received signal strength is selected carrier channel greater than threshold value Z1;
If b carrier channel received signal strength is during greater than threshold value Z2 and less than threshold value Z1, first-selected wireless channel;
If c carrier channel received signal strength is selected wireless channel less than threshold value Z2;
C, the 3rd comparison module:
When the wireless channel received signal strength during less than threshold value W2,
If a carrier channel received signal strength is selected carrier channel greater than threshold value Z2;
If b carrier channel received signal strength is less than threshold value Z2, detected carrier channel received signal strength and wireless channel received signal strength again after the time-delay;
W1=-85dbm，W2=-90dbm，Z1=-50dbm，Z2=-55dbm?；
3. automatically switch:
Because the wireless channel transmission rate is fast than carrier channel, so the acquiescence wireless channel is first-selected channel, therefore according to above-mentioned 2. in relatively several situations: if current channel received signal strength satisfies A or B-b or B-c, select wireless channel, namely do not need to switch; If current channel received signal strength satisfies B-a or C-a, select carrier channel, namely this moment, wireless channel can automatically switch into carrier channel; The rest may be inferred goes in follow-up automatic switchover work.
The present invention has following advantages and good effect:
1. the present invention is mainly used in the user power utilization information acquisition system, for the intelligent grid automatic data logging provides a kind of better communication mode: double-channel communication;
2. consider that existing communication channel is all single mode, defective is separately arranged, the present invention adopts the parallel channel, two interchannel independent parallel work mutually, cooperation mutually again, automatically switch simultaneously, given play to the advantage of each self-channel, effectively guarantee the highly effective and safe of information communication, realized high real copy rate and high-accuracy;
3. be applicable to Automatic meter reading system, Internet of Things, Smart Home and intelligent building, domestic network system, domestic automation system and safety-protection system etc.
Description of drawings
Fig. 1 is the block diagram of this device;
Fig. 2 is the block diagram of first detection module;
Fig. 3 is the block diagram of the second detection module;
Fig. 4 is the workflow diagram of this method;
Fig. 5 is the workflow diagram of the 1st comparison module S1;
Fig. 6 is the workflow diagram of the 2nd comparison module S2;
Fig. 7 is the workflow diagram of the 3rd comparison module S3.
In figure:
10-arrowband voltage Power Line Carrier Channel received signal strength detection module (abbreviation first detection module),
The 11-the 1 information source,
12-carrier channel,
The 13-the 1 hardware filtering device,
The 14-the 1 software filter,
15-carrier wave RSSI detector;
20-micropower wireless channel received signal strength detection module (being called for short the second detection module),
The 21-the 2 information source,
22-wireless channel,
The 23-the 2 hardware filtering device,
The 24-the 2 software filter,
25-wireless RSSI detector;
30-channel is selected module;
Z-noise source.
S1-the 1st comparison module, S2-the 2nd comparison module, S3-the 3rd comparison module.
Fig. 8 is the block diagram of Automatic meter reading system, in Fig. 8:
Main website of 100-system (power supply station's host computer);
200-communication channel (GPRS/CDMA);
300-concentrator;
400-intelligent electric meter.
Chinese to English:
* RSSI:Received Signal Strength Indicator, the received signal strength indicator device.
Embodiment
Below in conjunction with drawings and Examples to the detailed description of the invention:
One, device
1, overall
As Fig. 1, this device comprises first detection module 10, the second detection module 20 and channel selection module 30;
Its operation principle:
The purpose of this device is by the comparison to the received signal strength on carrier channel and wireless channel, judge the quality of carrier channel quality and quality of wireless channel, thereby carry out the automatic switchover of two kinds of channels, make the work of two channel independent parallels, complement each other, overcome the inferior position of single channel transmission, effectively the reliability of guarantee information communication.This device detects the carrier channel received signal strength by first detection module 10, detect the wireless channel received signal strength by the second detection module 20, then utilize channel to select module 30 that the carrier channel received signal strength that detects and wireless channel received signal strength and predetermined threshold value are compared, judge the quality of carrier channel and quality of wireless channel according to comparative result, select and switch thereby carry out channel.
2, functional block
1) first detection module 10
As Fig. 2, first detection module 10 comprises the 1st information source 11, carrier channel 12, the 1st hardware filtering device 13, the 1st software filter 14, the carrier wave RSSI detector 15 that connects successively; Wherein the 1st hardware filtering device 13 and the 1st software filter 14 positions can exchange mutually.
Its operation principle:
The 1st information source 11 can be subject to the interference of external noise source Z when sending signal by carrier channel 12, then through the 1st hardware filtering device 13 filtering part noise jamming, pass through again the 1st software filter 14 filtering part noise jamming again, after processing through the soft or hard double-smoothing like this, noise jamming is eliminated substantially, then by carrier wave RSSI detector 15, measure carrier channel received signal strength mean value.Suppose this M instantaneous value to be averaged the mean value that obtains RSSI, i.e. the instantaneous RSSI of the average RSSI=sum(carrier wave of carrier wave approximately recording the instantaneous value of M RSSI in 1 second)/the M(M value is subjected to external interference indefinite because of channel, is as the criterion with the actual measurement number).Suppose through after carrier channel, the scope of the average RSSI of carrier wave that surveys-90dbm～-10dbm between.If the average RSSI of carrier wave＜-55dbm, current carrier channel poor quality is described, can not proper communication; The average RSSI of-55dbm＜carrier wave＜-50dbm, illustrate that current carrier channel is fair, can be used as alternative channel; The average RSSI of carrier wave 〉-50dbm, illustrate that current carrier channel quality is fine.So, be all generally take-50dbm as critical point, judge the quality of current carrier channel quality.
(1) the 1st information source 11
Be present in the user power utilization acquisition system, be used for sending the various signals of checking meter.
(2) carrier channel 12
Being the low-voltage power line in the user power utilization acquisition system, is one of topmost communication channel of present electricity consumption acquisition system, mainly is used for transmitting the low voltage power line carrier signal.
(3) the 1st hardware filtering devices 13
Select general filter to get final product; Be mainly used to noise jamming in filtered signal etc.
(4) the 1st software filters 14
Select medium filtering; Some noise jamming in further filtered signal.
(5) carrier wave RSSI detector 15
Select general product, as long as can realize all passable of following measuring ability;
Be used for the mean value of the received signal strength on the detected carrier channel, so that the threshold values of selecting module 30 to set with channel compares, thereby the quality of judgement carrier channel and channel quality is carried out selection and the automatic switchover of two kinds of channels.
2) the second detection module 20
As Fig. 3, the second detection module 20 comprises the 2nd information source 21, wireless channel 22, the 2nd hardware filtering device 23, the 2nd software filter 24, the wireless RSSI detector 25 that connects successively; The 2nd hardware filtering device 23 and the 2nd software filter 24 positions can exchange mutually.
Its operation principle:
the 2nd information source 21 can be subject to the interference of outside noise etc. when sending signal by wireless channel 22, then through the 2nd hardware filtering device 23 meeting filtering part noise jamming, again by the 2nd software filter 24, filtering part noise jamming again, after processing through the soft or hard double-smoothing like this, noise jamming is eliminated substantially, then by wireless RSSI detector 25, if approximately can record the instantaneous value of N RSSI in 1 second, this N instantaneous value is averaged the mean value that obtains RSSI, be the wireless instantaneous RSSI of wireless average RSSI=sum()/the N(N value can be subjected to external interference indefinite because of wireless channel, be as the criterion with the actual measurement number).Suppose signal through after wireless channel, the scope of the wireless average RSSI that we survey-110dbm～-30dbm between.If wireless average RSSI＜-90dbm, illustrate that the current wireless channel quality is very poor, can not proper communication;-90dmb＜wireless average RSSI＜-85dbm, illustrate that the current wireless channel quality is general, can be used as alternative channel; Wireless average RSSI 〉-85dbm, illustrate that the current wireless channel quality is fine, be first-selected channel.So, be all generally take-85dbm as critical point, judge the quality of current wireless channel quality.
(1) the 2nd information source 21
Be present in the user power utilization acquisition system, be used for sending the various signals of checking meter.
(2) wireless channel 22
Be mainly the space electromagnetic wave, be used for transmitting the micropower wireless signal.
(3) the 2nd hardware filtering devices 23
Select general filter to get final product; Be mainly used to noise jamming in filtered signal etc.
(4) the 2nd software filters 24
Select medium filtering; Some noise jamming in further filtered signal.
(5) wireless RSSI detector 25
Select general product, as long as can realize all passable of following measuring ability;
Be used for detecting the mean value of the received signal strength on wireless channel, in order to select the threshold values of module 30 settings to compare with channel, thereby the quality of judgement carrier channel and quality of wireless channel is carried out selection and the automatic switchover of two kinds of channels.
3) channel is selected module 30
It is to realize by software programming that channel is selected module 30:
(1) hardware configuration:
Channel selects module 30 to be comprised of a microprocessor; This microprocessor is deposited the mean value of first detection module 10 and the second detection module 20 detected received signal strengths, and compare the analysis selective channel with pre-set threshold value, judge whether that according to current channel contrast needs automatically switch again: if selective channel is the same with current channel, need not switch; If different, automatically switch into the channel of selection.
(2) software programming
As Fig. 4, software programming comprises the 1st comparison module S1, the 2nd comparison module S2 and the 3rd comparison module S3, and the 1st comparison module S1, the 2nd comparison module S2 and the 3rd comparison module S3 are mutual successively, and recirculation is reciprocal.
Threshold value is set: W1=-85dbm, W2=-90dbm, Z1=-50dbm, Z2=-55dbm;
The average RSSI of carrier wave: carrier channel 21 received signal strength mean values;
Wireless average RSSI: wireless channel 22 received signal strength mean values.
Two, method
Based on above description scheme, the workflow of this changing method is as shown in Fig. 4,5,6 and 7.
As Fig. 4, the workflow diagram of this method is:
The 1st comparison module S1, the 2nd comparison module S2 and the 3rd comparison module S3 are mutual successively, and recirculation is reciprocal.
1, the workflow of the 1st comparison module S1
As Fig. 5, the workflow of the 1st comparison module S1 is:
0, wireless average RSSI and the average RSSI's of carrier wave obtains-000;
A, whether judge wireless average RSSI〉W1-S11, be first-selected wireless channel 22, otherwise enter the 2nd comparison module S2.
2, the workflow of the 2nd comparison module S2
As Fig. 6, the workflow of the 2nd comparison module S2 is:
0, connect the 1st comparison module S1;
A, whether judge wireless average RSSI〉W2-S21, be to enter step B, otherwise enter the 3rd ratio
Than module S3;
B, whether judge the average RSSI of carrier wave〉Z1-S22, be to select carrier channel 12, otherwise enter step C;
C, whether judge the average RSSI of carrier wave〉Z2-S23, be first-selected wireless channel 22, otherwise select wireless channel 22.
3, the workflow of the 3rd comparison module S3
As Fig. 7, the workflow of the 3rd comparison module is:
0, connect the 2nd comparison module S2;
A, whether judge the average RSSI of carrier wave〉Z2-S31, be to select carrier channel 12, otherwise enter the 1st comparison module S1 through after time-delay-S32.
Three, Application Example
1, Automatic meter reading system
As Fig. 8, Automatic meter reading system comprises main website of system (power supply station's host computer) 100, communication channel (GPRS/CDMA) 200, concentrator 300 and intelligent electric meter 400;
carry out transfer of data by communication channel (GPRS/CDMA) 200 between main website of system (power supply station's host computer) 100 and concentrator 300, carry out transfer of data by carrier channel 12 or wireless channel 22 between concentrator 300 and intelligent electric meter 400, the 1st hardware filtering device 13, the 1st software filter 14, carrier wave RSSI detector, the 2nd hardware filtering device 23, the 2nd software filter 24, wireless RSSI detector 25 and channel select module 30 all to design in intelligent electric meter 400 the insides (not drawing in this system), the 1st information source 11 and the 2nd information source 21 mainly provide (not marking in this system) by concentrator 300.
2, the present invention is equally applicable to Internet of Things, Smart Home and intelligent building, domestic network system, domestic automation system and safety-protection system etc.
Although more than described the specific embodiment of the present invention, but those skilled in the art is to be understood that, these embodiments only illustrate, those skilled in the art can carry out various omissions, replacement and change to the details of said method and system in the situation that do not break away from principle of the present invention and essence.For example, merge the said method step, belong to scope of the present invention thereby carry out the identical function of essence according to the identical method of essence to realize the identical result of essence.Therefore, scope of the present invention is only limited by appended claims.
Claims (2)
1. an arrowband power line carrier and the wireless double-channel automatic switching control equipment of micropower is characterized in that:
Comprise first detection module (10), the second detection module (20) and channel selection module (30);
First detection module (10) be connected detection module (20) and select module (30) to be connected with channel respectively;
Described first detection module (10) comprises the 1st information source (11), carrier channel (12), the 1st hardware filtering device (13), the 1st software filter (14) and the carrier wave RSSI detector (15) that connects successively;
Described the second detection module (20) comprises the 2nd information source (21), wireless channel (22), the 2nd hardware filtering device (23), the 2nd software filter (24) and the wireless RSSI detector (25) that connects successively;
Described channel selects module (30) to be comprised of a microprocessor.
2. based on the automatic switching method of the described device of claim 1, it is characterized in that comprising the following steps:
1. first detection module (S1) detects the received signal strength on carrier channel (12), and the second detection module (S2) detects the received signal strength on wireless channel (22);
2. channel two kinds of signal strength signal intensities and the predetermined threshold value of selecting that module (30) will detect compares;
The first comparison module (S1):
Greater than threshold value W1, select wireless channel (22) when wireless channel (22) received signal strength;
B, the second comparison module (S2):
When wireless channel (22) received signal strength during greater than threshold value W2 and less than threshold value W1,
If a carrier channel (12) received signal strength is selected carrier channel (12) greater than threshold value Z1;
If b carrier channel (12) received signal strength is during greater than threshold value Z2 and less than threshold value Z1, first-selected wireless channel (22);
If c carrier channel (12) received signal strength is selected wireless channel (22) less than threshold value Z2;
C, the 3rd comparison module (S3):
When wireless channel (22) received signal strength during less than threshold value W2,
If a carrier channel (12) received signal strength is selected carrier channel (12) greater than threshold value Z2;
If b carrier channel (12) received signal strength is less than threshold value Z2, detected carrier channel (12) received signal strength and wireless channel (22) received signal strength again after the time-delay;
W1=-85dbm，W2=-90dbm，Z1=-50dbm，Z2=-55dbm?；
3. automatically switch:
Because wireless channel (22) transmission rate is fast than carrier channel (22), so the acquiescence wireless channel is first-selected channel, therefore according to above-mentioned 2. in relatively several situations: if current channel received signal strength satisfies A or B-b or B-c, select wireless channel, namely do not need to switch; If current channel received signal strength satisfies B-a or C-a, select carrier channel, namely this moment, wireless channel can automatically switch into carrier channel; The rest may be inferred goes in follow-up automatic switchover work.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310087131.3A CN103138801B (en) | 2013-03-19 | 2013-03-19 | Device and method for automatic switching of narrow-band power line carrier and micro-power wireless binary channel |
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| CN201310087131.3A CN103138801B (en) | 2013-03-19 | 2013-03-19 | Device and method for automatic switching of narrow-band power line carrier and micro-power wireless binary channel |
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| CN103138801B CN103138801B (en) | 2014-10-15 |
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| CN103731249A (en) * | 2014-01-15 | 2014-04-16 | 杭州箭源电子有限公司 | Digital communication method and device for improving intelligent power grid communication reliability |
| CN104753567A (en) * | 2015-04-10 | 2015-07-01 | 北京豪络科技有限公司 | Power line carrier and wireless Bluetooth bi-channel automatic switching system and method |
| CN105282808A (en) * | 2015-09-09 | 2016-01-27 | 国家电网公司 | Intelligent electric energy meter communication module dual-mode communication channel division method |
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| CN103731249A (en) * | 2014-01-15 | 2014-04-16 | 杭州箭源电子有限公司 | Digital communication method and device for improving intelligent power grid communication reliability |
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| CN106452505B (en) * | 2015-08-12 | 2018-12-28 | 国家电网公司 | A kind of carrier wave and wireless MAC layer converged communication method and apparatus |
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| CN107886696A (en) * | 2017-11-21 | 2018-04-06 | 珠海中慧微电子有限公司 | A kind of method for connecting Wireless signal blind zone node and realizing meter reading |
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| CN113574905A (en) * | 2019-03-13 | 2021-10-29 | 皇家飞利浦有限公司 | Recommending whether object monitoring system uses wireless communication mode |
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| CN110930676A (en) * | 2019-12-10 | 2020-03-27 | 国网湖南省电力有限公司 | Electricity consumption information acquisition system and method based on dual-mode communication |
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| CN114244452A (en) * | 2021-11-10 | 2022-03-25 | 云南电网有限责任公司 | Wireless narrow-band module for power transmission line |
| CN116979997A (en) * | 2023-08-03 | 2023-10-31 | 国网思极位置服务有限公司 | Dual-mode communication-based power distribution network automation method and system |
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