CN105873230A - Synchronization method for broadband carrier broadcast communication of power line - Google Patents
Synchronization method for broadband carrier broadcast communication of power line Download PDFInfo
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- CN105873230A CN105873230A CN201610187564.XA CN201610187564A CN105873230A CN 105873230 A CN105873230 A CN 105873230A CN 201610187564 A CN201610187564 A CN 201610187564A CN 105873230 A CN105873230 A CN 105873230A
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- 238000004891 communication Methods 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000001514 detection method Methods 0.000 claims abstract description 16
- 230000005540 biological transmission Effects 0.000 claims abstract description 11
- 230000001360 synchronised effect Effects 0.000 claims description 9
- 238000004364 calculation method Methods 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 3
- 235000013399 edible fruits Nutrition 0.000 claims 1
- 230000007246 mechanism Effects 0.000 abstract description 2
- 230000009977 dual effect Effects 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 5
- 230000005611 electricity Effects 0.000 description 4
- 238000005562 fading Methods 0.000 description 2
- 230000006855 networking Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000008485 antagonism Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/02—Hybrid access
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
- H04B3/544—Setting up communications; Call and signalling arrangements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
Abstract
The invention discloses a synchronization method for broadband carrier broadcast communication of a power line. A dual protection mechanism combining a time slot distribution algorithm based on TDMA with signal-to-interference-and-noise-ratio detection is provided specific to transmission features and existed problems of broadband carrier communication broadcast data of the power line; and the reliability and communication efficiency of broadcast communication are ensured. A time slot synchronization algorithm based on the TDMA is provided, so that a node is equipped with a unique time slot. The time slot synchronization algorithm is carried out on the broadcast data, so that subnodes start time slot timers after reception of the broadcast data frames is finished; accurate synchronization is carried out on opportune moments for forwarding the broadcast data frames; and conflicts produced when the data is sent can be avoided to the greatest extent.
Description
Technical field
The invention belongs to power wire broadband carrier communication field, specifically a kind of power wire broadband carrier network broadcasting communication and time slot
Synchronous method.The present invention is for solving the problem that power wire broadband carrier broadcast communication synchronizes.
Background technology
While China's power industry fast development, power system commercial operation collection automatic to power information proposes higher
Requirement, not only needs accurate, to make a copy of electricity consumer on time power consumption, calculates line loss, carries out the optimization of circuit, in addition it is also necessary to understand
The electricity consumption curve of every day, carries out load prediction, effectively feeds back for power plant or power station so that it is can more effectively formulate meter
Draw generating.Therefore, traditional low-speed DAQ mode can not meet the requirement of commercial operation.
At present, domestic existing Electricity Meters Auto Transcription System, mostly take 485 cloth from electric energy meter, harvester to concentrator
Line, arrowband low-frequency electrical line of force carrier wave or communication.These kilowatt meter reading-out systems generally exist that difficulty of construction is big, bandwidth is narrow,
The problems such as speed is too low, poor real, it is difficult to meet power supply enterprise's electricity charge prepayment, disconnected telegram in reply and the pipe of anti-electricity-theft contour level
Reason requirement.
For problem above, more and more enterprises use low-voltage power line bandwidth carrier communication technology to apply to kilowatt meter reading-out system, due to
Power wire broadband carrier communication technology have employed the modulation technique such as OFDM (OFDM), DMT (multi-carrier modulation).Should
The essential idea of technology is to break a channel into several orthogonal sub-channels, then data flow point of a relatively high for transfer rate is slit into
The sub data flow that the transfer rate of multiple parallel transmissions is relatively low, is adjusted to different orthogonal sub-channels respectively and transmits, thus can
Multidiameter fading channel is converted into the subchannel of relatively flat, it is possible to the multipath fading in effective antagonism power line communication.Broadband
Carrier communication possesses the advantages such as more preferable anti-electric network noise ability, broader transmission bandwidth and higher data transmission bauds.
Bandwidth carrier module includes host node and the child node of ammeter end of concentrator side.Communication network is by a host node and multiple
Child node forms, and child node quantity can arrive more than 1000.Mutually can not directly communicate between child node, but can forward
Data.Network type can be Star Network, bunch l network (as shown in Figure 1), and the concrete framework of network is true by host node
Fixed.
Copy in application at power information collection, it is sometimes desirable to when carrying out broadcasting school, the broadcast communication such as networking.Power wire broadband carrier leads to
Communication network is divided into physical layer, link layer, Internet, application layer by layer.After bandwidth carrier communication network is set up, broadcast communication
Mainly it is transmitted controlling by link layer.Broadcast communication feature makes the link layer of multiple node can lead in identical time tranfer data
Cause interferes, and easily produces broadcast storm, or cannot reply broadcast, has that efficiency is low, the asking of poor reliability
Topic.
Summary of the invention
The present invention is directed to the feature of power wire broadband carrier network broadcasting communication and the problem of existence, it is proposed that a kind of detection signal is done
Disturb noise ratio and combine the broadcast communication synchronous method of TDMA algorithm.
Signal Interference and Noise Ratio (SINR) is an Important Parameters in carrier communication system, accurately estimating of Signal Interference and Noise Ratio
Meter is the Main Basis that OFDM electric line communication system carries out bit loading, power control etc..Commenting of Signal Interference and Noise Ratio
Estimate method a lot, be specifically referred to pertinent literature.Such as: patent " Signal Interference and Noise Ratio in a kind of electric line communication system
Blind estimating method ".
Technical scheme: a kind of power wire broadband carrier broadcast communication synchronous method, media access control layer (MAC) is being carried out extensively
When broadcasting communication, use time division multiple acess (TDMA) and detect the method that Signal Interference and Noise Ratio (SINR) combines:
Media access control layer (MAC) uses time division multiple acess (TDMA) Slot Allocation Algorithm carry out broadcast data transmission and turn
Sending out, child node is when being transmitted, by the time after the time slot of node self, and the time that first 0-80 byte of random delay sends
Whether whether Tr, then have time slot beyond setting threshold decision by detection Signal Interference and Noise Ratio (SINR) within the time of Tc
Collision, if be detected that collision is not then transmitted, wherein:
Tr:(0～80 randoms number) × 8 × (1/ communication baud rate)；
Tc: Signal Interference and Noise Ratio (SINR) the detection time；
If be detected that there is time slot collision, data do not send successfully, then child node waits next round time slot, duplicate detection mistake
Journey.
Preferably, described child node Slot Allocation Algorithm is:
By formula n=mod, (MID, m) sequence of calculation number n, obtain timeslice Tn, and node has the right to carry out in timeslice Tn
Transmission, in formula:
Low two byte value of MID: child node address；
M: child node quantity in network.
Preferably, electric line communication system uses OFDM modulation (OFDM), and power line communication channel uses many
Footpath model.
In some embodiments, Signal Interference and Noise Ratio (SINR) uses the blind estimating method of Signal Interference and Noise Ratio, specifically
With reference to patent application " 201410020945.X ", " the blind estimate side of Signal Interference and Noise Ratio in a kind of electric line communication system
Method "；In some embodiments, Signal Interference and Noise Ratio (SINR) uses the ratio work of the average with detection signal and variance
Method for Signal to Interference plus Noise Ratio is estimated.
Preferably, each child node starts a slot timer at the end of broadcast data frame receives and carries out accurate synchronization.
Beneficial effect: link layer communications uses TDMA algorithm, solves broadcast transmission and to problems such as the single replies broadcasted.
Link layer uses TDMA algorithm to be that each network node distributes independent time slot, and node device carries out broadcast biography at the time slot of oneself
Defeated and data respond.Detected by Signal Interference and Noise Ratio when data send and judge, improve transmission success rate.So may be used
To improve communication efficiency in the case of fully promoting broadcast communication reliability.
Accompanying drawing explanation
Fig. 1 is bandwidth carrier communication network topology structure
Fig. 2 is slot synchronization mechanism structure figure
Detailed description of the invention
Below in conjunction with the accompanying drawings and specific embodiment, the present invention is described in detail:
When carrying out bandwidth carrier broadcast communication, link layer etc., until time started that current time is node sending time slots, starts
Send data.Use before sending data whether Signal Interference and Noise Ratio SINR detection present channel has conflict.If channel estimating
Result is for taking, then the random back regular hour is detected again.If be channel occupancy through detection several times always, then send
Failure.If be detected that channel idle (signal disturbing noise is less than setting value), send data the most immediately.
As in figure 2 it is shown, bandwidth carrier communication network is during networking and in data broadcasting process, use between each node
Slot synchronization algorithm based on TDMA carries out link data transmission.
TDMA algorithm
1) definition of time slot (Tb) a: time slot is allocated to a sub node equipment and sends the set time of broadcast frame, adds up to
Tb, is specifically defined as shown in Figure 2.
Illustrate:
Tb is fixed as time period, such as a 300ms, including signal sending time Ts (such as 200ms) and protection
Time slot Tp (such as 100ms).
2) node slot time location
Node slot time location is the child node in network to be assigned in different time slots, makes the time slot of multiple child node as far as possible
Discrete, to reduce its probability of conflict when transmission.The mode of time slot location Calculation is:
Sequence of calculation number n, obtains timeslice Tn, and node has the right to be transmitted in timeslice Tn.Sequence number n computing formula
For:
N=mod (MID, m)；
Wherein:
Low two byte value of MID: child node address；
M: child node quantity in network.
Child node is when being transmitted, by the time after the time slot of node self, and the time that first 0-80 byte of random delay sends
Whether whether Tr, then have time slot to touch beyond setting threshold decision by detection Signal Interference and Noise Ratio SINR within the time of Tc
Hit, if be detected that collision is not then transmitted, wherein:
Tr:(0～80 randoms number) × 8 × (1/ communication baud rate)；
Tc: the channel confliction detection time.
If be detected that there is time slot collision, data do not send successfully, then child node waits that next round time slot repeats this detection
Judge process.After networks are completed, because there being unique time slot, it is not necessary to Random Waiting Time Tr.
In a preferred embodiment, Signal Interference and Noise Ratio (SINR) uses the blind estimating method of Signal Interference and Noise Ratio, specifically
Implement with reference to patent application " 201410020945.X ", " the blind estimate side of Signal Interference and Noise Ratio in a kind of electric line communication system
Method "；In other embodiments, Signal Interference and Noise Ratio (SINR) uses the ratio work of the average with detection signal and variance
Method for Signal to Interference plus Noise Ratio is estimated.
Node has unique time slot.Broadcast data uses slot synchronization algorithm so that child node receives at broadcast data frame and terminates
Shi Qidong slot timer, for forwarding carry out accurate synchronization the opportunity of broadcast data frame.Thus avoid data to greatest extent and send
Time conflict.
Although the present invention is illustrated with preferred embodiment referring to the drawings, but, for a person skilled in the art,
The present invention can have various modifications and variations.The various changes of the present invention, change, and equivalent have appending claims
Content contains.
It is the most same as the prior art that the present invention is not directed to technology, and prior art maybe can be used to realize.
Claims (5)
1. a power wire broadband carrier broadcast communication synchronous method, it is characterised in that media access control layer (MAC) is being broadcasted
During communication, use time division multiple acess (TDMA) and detect the method that Signal Interference and Noise Ratio (SINR) combines:
Media access control layer (MAC) uses time division multiple acess (TDMA) Slot Allocation Algorithm to carry out broadcast data transmission and forwarding,
Child node is when being transmitted, by the time after the time slot of node self, and the time Tr that first 0-80 byte of random delay sends, then
By detection Signal Interference and Noise Ratio (SINR) whether beyond setting whether threshold decision has time slot collision within the time of Tc, as
Fruit detects and does not collide, and is transmitted, wherein:
Tr:(0～80 randoms number) × 8 × (1/ communication baud rate)；
Tc: Signal Interference and Noise Ratio (SINR) the detection time；
If be detected that there is time slot collision, data do not send successfully, then child node waits next round time slot, duplicate detection process.
A kind of power wire broadband carrier broadcast communication synchronous method the most according to claim 1, it is characterised in that during described child node
Gap allocation algorithm is:
By formula n=mod, (MID, m) sequence of calculation number n, obtain timeslice Tn, and node has the right to pass in timeslice Tn
Defeated, in formula:
Low two byte value of MID: child node address；
M: child node quantity in network.
A kind of power wire broadband carrier broadcast communication synchronous method the most according to claim 1, it is characterised in that power line communication system
System uses OFDM modulation (OFDM), and power line communication channel uses multipath model.
A kind of power wire broadband carrier broadcast communication synchronous method the most according to claim 1, it is characterised in that signal disturbing noise
The blind estimating method of Signal Interference and Noise Ratio is used or using the ratio of average and the variance of detection signal as Signal to Interference plus Noise Ratio than (SINR)
Method be estimated.
A kind of power wire broadband carrier broadcast communication synchronous method the most according to claim 1, it is characterised in that each child node exists
Broadcast data frame starts a slot timer at the end of receiving and carries out accurate synchronization.
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| CN201610187564.XA CN105873230A (en) | 2016-03-29 | 2016-03-29 | Synchronization method for broadband carrier broadcast communication of power line |
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| CN201610187564.XA CN105873230A (en) | 2016-03-29 | 2016-03-29 | Synchronization method for broadband carrier broadcast communication of power line |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107809139A (en) * | 2017-09-28 | 2018-03-16 | 南京林洋电力科技有限公司 | A kind of user's power-off event report method based on low-voltage power line bandwidth carrier |
| CN109618409A (en) * | 2018-12-08 | 2019-04-12 | 中国人民解放军陆军工程大学 | Self-organizing neighborhood information interaction method facing unmanned system |
| CN110087196A (en) * | 2019-04-26 | 2019-08-02 | 深圳芯珑电子技术有限公司 | A kind of micropower wireless network power failure report method |
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| CN107809139A (en) * | 2017-09-28 | 2018-03-16 | 南京林洋电力科技有限公司 | A kind of user's power-off event report method based on low-voltage power line bandwidth carrier |
| CN109618409A (en) * | 2018-12-08 | 2019-04-12 | 中国人民解放军陆军工程大学 | Self-organizing neighborhood information interaction method facing unmanned system |
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| CN110087196A (en) * | 2019-04-26 | 2019-08-02 | 深圳芯珑电子技术有限公司 | A kind of micropower wireless network power failure report method |
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