CN108667486A - A kind of reliable polling communication method of power line carrier - Google Patents
A kind of reliable polling communication method of power line carrier Download PDFInfo
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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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0061—Error detection codes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/1607—Details of the supervisory signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
- H04L41/0654—Management of faults, events, alarms or notifications using network fault recovery
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/08—Configuration management of networks or network elements
- H04L41/0803—Configuration setting
- H04L41/0823—Configuration setting characterised by the purposes of a change of settings, e.g. optimising configuration for enhancing reliability
- H04L41/0836—Configuration setting characterised by the purposes of a change of settings, e.g. optimising configuration for enhancing reliability to enhance reliability, e.g. reduce downtime
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
- H04L43/0823—Errors, e.g. transmission errors
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/10—Active monitoring, e.g. heartbeat, ping or trace-route
- H04L43/103—Active monitoring, e.g. heartbeat, ping or trace-route with adaptive polling, i.e. dynamically adapting the polling rate
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Abstract
The invention discloses a kind of reliable polling communication methods of power line carrier using protocol frame as carrier, specifically comprises the following steps：1）Protocol format first used in design grid network layers is mainly made of host address, slave addresses, frame ordering code, polling status code, frame number, data field, data field length, cyclic check code 16；Then first data are verified；2）Judge frame number；3）Judge the mode bit in protocol frame；4）Mode bit is 0 and illustrates that host last time does not receive successfully the content of this slave, and slave judges that last the machine was sent to host has the protocol frame of data or the protocol frame of empty data again；5）Timeout treatment.The invention enables communication system packet loss to substantially reduce, and this system is made to complete the reliable polling communication of multiple spot high speed on the power line of industrial environment bad channel, and there is good QoS to ensure, meet the high reliability request in information collection, reduce network failure rates.
Description
Technical field
The present invention relates to a kind of reliable polling communication methods of power line carrier.Belong to power line telecommunication technical field.
Background technology
So-called low pressure carrier wave（Low-voltage powerline carrier communication）Refer to using existing low-voltage network as transmission medium,
Realize that a kind of technology of data transfer and information exchange, the i.e. signal of communication of high frequency are different by occupancy from electric power frequency electric current
Frequency range is carried out power common gauze network and is transmitted.
Polling communication technology is a kind of controlled access technology.In the circuit for sharing common channel by multiple nodes, host
Each node is inquired after whether there is or not the requirement of transmission information according to certain sequence, and the node inquired after requires just to occupy public if any transmission
Otherwise channel sends information to host, host continues to inquire after next node.This is a kind of channel access method of polling type,
It is also one of the method for being used in RS232 and RS485 buses the most universal, this is a kind of central controlled method.
Since power line carrier communication is compared with traditional communication there is huge otherness and particularity, circuit hinders
Anti-, noise, decline and multidiameter delay etc. all seriously affect the performance of voltage Power Line Carrier Channel, seriously reduce communication quality.Institute
It cannot be directly used in power line network with this kind of ripe polling protocol for being applied to private wire network, it is necessary to make improvement
It can be suitably used on the power line of bad channel.
On the preferable wire cable of communication quality, line-hit environment causes to lose data polling protocol major applications
The case where few therefore traditional polling protocol do not make reliable retransmit for loss of data and reissue communication mechanism, and
In power line complex environment, the case where loss of data is normality.
In the prior art, the method for promoting power line carrier communication reliability has：Promote Carrier Node signal transmission power；
Use orthogonal frequency division multiplexi；Application number 201410366420.1 also proposes to interfere small region to carry out data biography in zero crossing
It is defeated；But reliability that these methods are brought improves limited, and the angle do not reissued from the re-transmission of application layer protocol frame solves to lead to
Believe integrity problem.
Therefore it needs that the data loss problem generated on power line is applied to propose a kind of reliable communicating for polling mechanism
Solution.
Invention content
The purpose of the present invention is to solve disadvantages existing in the prior art, and a kind of power line carrier proposed is reliable
Polling communication method.The present invention proposes the high reliability means of communication for power line carrier polling mode；One node of slave
Breaking down will not make entire bus paralyse；Network layer applies a variety of guarantee communication mechanisms；By the method so that communication system
System packet loss substantially reduces, and so that this system is completed the reliable poll of multiple spot high speed on the power line of industrial environment bad channel logical
There is good QoS to ensure, meet the high reliability request in information collection, reduce network failure rates for letter.
To achieve the goals above, present invention employs following technical solutions：
A kind of reliable polling communication method of power line carrier specifically comprises the following steps using protocol frame as carrier：
1）Protocol format first used in design grid network layers, mainly by host address, slave addresses, frame ordering code, poll shape
State code, frame number, data field, data field length, cyclic check code 16 (CRC16) composition；Then school first is carried out to data
It tests, all bytes before 16 areas (CRC16) of protocol frame cyclic check code is carried out using 16 cyclic redundancy check algorithms
The table that cyclic redundancy check is constituted is stored in Flash by verification, and verification speed, host inquiry association are accelerated using quick look-up table
Discuss frame and slave response protocol frame all verification by the case of read and send, the transmission of the digital independent and transmission
Data are transmitted according to protocol format, it is ensured that protocol frame is without byte loss and mistake in transmission process；Enter after verification is correct
Step 2）, otherwise terminate this answering, wait for next host inquiry；
2）Judge frame number, due to adding carrier-current relaying function and functions of retransmission, data packet reaches host side and connect in the presence of repetition
Receive data and out of order problem；Therefore this problem, host is avoided only to receive desired data by the way that frame number is added, especially
It is that, by judging that frame number is ranked up storage, ensure that the orderly of data when having sequence requirement to the data that slave reaches
Property, and frame number is coherent, when going out active wherein 1 frame, host is by the frame number of loss come requirement slave weight
Send out the corresponding agreement content frame of this serial number；If the serial number that serial number and slave are locally remembered is equal, illustrate that this protocol frame is just
True protocol frame carries out step 3）, otherwise terminate this answering；
3）Judge that the mode bit in protocol frame, the polling status position of host inquiry protocol frame indicate that last time host receives the number of slave
According to correctness, no matter whether slave replys, and host can inquire next slave when next timeslice starts, and solves host
Not the problem of not receiving slave response and repeatedly asking；Host starts to inquire that a slave takes to slave data back to host
4-6ms or so, in addition data processing time, each slave interval of host computer polls is set in 10ms, and slave receives inquiry agreement
Conditional code in judging after frame, if mode bit illustrates that host last time has been properly received the data of the machine for 1, local new
Data and serial number 1 transmit to host from increasing；If mode bit is 0, step 4 is carried out）；If it exceeds 10ms does not still have
There is response then to enter step 5）Timeout treatment；
4）Mode bit is 0 and illustrates that host last time does not receive successfully the content of this slave, and slave judges that last the machine is sent again
There are the protocol frame of data or the protocol frame of empty data to host；If it is the protocol frame for having data, then retransmission buffer
For the data of middle last time to host, serial number is constant, is otherwise the protocol frame of sky data, slave still send the protocol frames of empty data to
Host, serial number are constant；
5）Timeout treatment, the speed that host distributes 10 ms according to a slave point are polled；The mutual transmission association of principal and subordinate
The case where view frame will appear loss due to channel disturbance.The protocol frame of each transmission data of host all starts timer and starts to count
When；When host inquiry protocol frame is sent out, timer starts timing, sentences when not receiving slave response more than setting time 10ms
Length can be arranged according to network load, channel disturbance concrete condition in disconnected time-out, timeouts time.0 explanation of polling status position
Response is not received, and next poll is retransmitted；1 is set if receiving response, corresponding slave timer stops timing.
Beneficial effects of the present invention are：The present invention proposes high reliability communication side for power line carrier polling mode
Method；One nodes break down of slave will not make entire bus paralyse；Network layer applies a variety of guarantee communication mechanisms；Pass through this
Method makes communication system packet loss substantially reduce, and this system is made to complete multiple spot on the power line of industrial environment bad channel
There is good QoS to ensure, meet the high reliability request in information collection for reliable polling communication at a high speed, reduce network event
Barrier rate.
Description of the drawings
Fig. 1 is the process step of the invention figure；
Process sequence diagram when Fig. 2 is timeout treatment of the present invention.
Specific implementation mode
As shown in Figure 1, a kind of reliable polling communication method of power line carrier specifically includes as follows using protocol frame as carrier
Step：
1）Protocol format first used in design grid network layers, mainly by host address, slave addresses, frame ordering code, poll shape
State code, frame number, data field length, data field, cyclic check code 16 (CRC16) composition；Then school first is carried out to data
It tests, school is carried out to all bytes before protocol frame cyclic check code 16 (CRC16) using 16 cyclic redundancy check algorithms
It tests, the table that cyclic redundancy check is constituted is stored in Flash, verification speed is accelerated using quick look-up table, host inquires agreement
Frame and slave response protocol frame all verification by the case of read and send, the transmission number of the digital independent and transmission
According to being transmitted according to protocol format, it is ensured that protocol frame is without byte loss and mistake in transmission process；Enter step after verification is correct
Rapid 2）, otherwise terminate this answering, wait for next host inquiry；
Master/slave machine address (Host/Slave Address)
Show the source address of data and reach slave addresses, power line belongs to shared channel, and each frame can be by each section in bus
Point listens to, and is defined as broadcast frame when address is 0xFF, host address and slave addresses respectively account for a byte.
Frame ordering code (Command)
It needs to transmit different frame types in communication, is divided into 0x01 data frames, 0x02 command frames, 0x03 no data acknowledgement frames, number
According to acknowledgement frame, urgent frame etc. is finished receiving, the type of transmission is provided by frame ordering code, occupies a byte.
Polling status code (Polling State)
Indicate that this slave last time is polled, host receives data correct status code and sets to 0 x01, and mistake sets to 0 x00, occupies a word
Section.
Frame number (Sequence Number)
Each data packet is assigned unique sequence number, to identify packet, is not only avoided that repetition, moreover it is possible to ensure the suitable of data
Sequence, when this is transmitted and received successfully, next data packet is that the data sequence number just sent adds 1, and serial number is 0~28Cycle in -1.
Occupy a byte.
Data field length (Data Length)
The length in designation date area, 1450 byte of a frame maximum transmitted, transmitted data amount are big.
Data field (Data)
Place the data for needing to transmit.
Cyclic check code 16 (CRC16)
High quality error detection is carried out to the data of transmission, ensures data correctness, using quick look-up table, occupies 2 bytes.
2）Judge frame number, due to adding carrier-current relaying function and functions of retransmission, data packet reaches host side and there is weight
Data and out of order problem are received in multiple connection；Therefore this problem, host is avoided only to receive desired data by the way that frame number is added,
Especially when having sequence requirement to the data that slave reaches, by judging that frame number is ranked up storage, data are ensure that
Order, and frame number is coherent, when going out active wherein 1 frame, host by the frame number of loss come require from
Machine retransmits the corresponding agreement content frame of this serial number；If the serial number that serial number and slave are locally remembered is equal, illustrate this protocol frame
It is correct protocol frame, carries out step 3）, otherwise terminate this answering；
3）Judge that the mode bit in protocol frame, the polling status position of host inquiry protocol frame indicate that last time host receives the number of slave
According to correctness, no matter whether slave replys, and host can inquire next slave when next timeslice starts, and solves host
Not the problem of not receiving slave response and repeatedly asking；Host starts to inquire that a slave takes to slave data back to host
4-6ms or so, in addition data processing time, each slave interval of host computer polls is set in 10ms, and slave receives inquiry agreement
Conditional code in judging after frame, if mode bit illustrates that host last time has been properly received the data of the machine for 1, local new
Data and serial number 1 transmit to host from increasing；If mode bit is 0, step 4 is carried out）；If it exceeds 10ms does not still have
There is response then to enter step 5）Timeout treatment；
4）Mode bit is 0 and illustrates that host last time does not receive successfully the content of this slave, and slave judges that last the machine is sent again
There are the protocol frame of data or the protocol frame of empty data to host；If it is the protocol frame for having data, then retransmission buffer
For the data of middle last time to host, serial number is constant, is otherwise the protocol frame of sky data, slave still send the protocol frames of empty data to
Host, serial number are constant；
5）Timeout treatment, the speed that host distributes 10 ms according to a slave point are polled；The mutual transmission association of principal and subordinate
The case where view frame will appear loss due to channel disturbance.The protocol frame of each transmission data of host all starts timer and starts to count
When；When host inquiry protocol frame is sent out, timer starts timing, sentences when not receiving slave response more than setting time 10ms
Length can be arranged according to network load, channel disturbance concrete condition in disconnected time-out, timeouts time.0 explanation of polling status position
Response is not received, and next poll is retransmitted；1 is set if receiving response, corresponding slave timer stops timing, and step process is shown in
Fig. 2.
Protocol frame:" frame " data consist of two parts：Frame head and frame data.Frame head includes recipient's host-physical address
Positioning and other network informations.Contain a data volume in region frame data.To ensure that computer can explain the number in data frame
According to this two computers of host, slave use a kind of common communications protocol.The communications protocol abbreviation IP that internet uses, i.e.,
Internet protocol.IP data volumes consist of two parts：The data field on data volume head and data volume.Data volume head includes the sources IP
Address and IP destination addresses and other information.The data field of data volume includes User Data Protocol（UDP）, pass transport control protocol
View（TCP）, the also other information of data packet.These data packets all contain additional progress information and real data.
CRC, that is, cyclic redundancy check code（Cyclic Redundancy Check）：It is most common in data communication field
The length of a kind of debugging check code, information field and check field can be arbitrarily selected.Cyclical Redundancy Check（CRC）It is a kind of
Data transmission error detection function carries out polynomial computation to data, and obtained result is attached to behind frame, and receiving device is also held
The similar algorithm of row, to ensure the correctness and integrality of data transmission.
QOS（Quality of Service, service quality）, different application different service quality is wanted to meet user
It asks, it is necessary to which network can distribute acording to the requirement of user and scheduling resource, provides different data flows different service quality：
To real-time and important data message priority processing；For highly reliable data message, higher reliability is provided
Processing, QoS index represent the service quality of a communication system.
The present embodiment proposes the high reliability means of communication for power line carrier polling mode；One node of slave occurs
Failure will not make entire bus paralyse；Network layer applies a variety of guarantee communication mechanisms；By the method so that communication system is lost
Packet rate substantially reduces, and this system is made to complete the reliable polling communication of multiple spot high speed on the power line of industrial environment bad channel,
It is ensured with good QoS, meets the high reliability request in information collection, reduce network failure rates.
Claims (1)
1. a kind of reliable polling communication method of power line carrier, which is characterized in that using protocol frame as carrier, specifically include following step
Suddenly：
1) protocol format first used in design grid network layers, mainly by host address, slave addresses, frame ordering code, poll shape
16 state code, frame number, data field, data field length, cyclic check code compositions；Then first data are verified, using 16
Position cyclic redundancy check algorithm verifies all bytes before protocol frame cyclic check code 16 (CRC16), by CRC check
The table that code is constituted is stored in Flash, accelerates verification speed using quick look-up table, host inquires protocol frame and slave response
Protocol frame all verification by the case of read and send, the transmission data of the digital independent and transmission is according to agreement
Format transmission, it is ensured that protocol frame is without byte loss and mistake in transmission process；It enters step 2) after verification is correct, otherwise terminates
This answering waits for next host inquiry；
2) judge frame number, due to adding carrier-current relaying function and functions of retransmission, data packet reaches host side and connect in the presence of repetition
Receive data and out of order problem；Therefore this problem, host is avoided only to receive desired data by the way that frame number is added, especially
It is that, by judging that frame number is ranked up storage, ensure that the orderly of data when having sequence requirement to the data that slave reaches
Property, and frame number is coherent, when going out active wherein 1 frame, host is by the frame number of loss come requirement slave weight
Send out the corresponding agreement content frame of this serial number；If the serial number that serial number and slave are locally remembered is equal, illustrate that this protocol frame is just
True protocol frame carries out step 3), otherwise terminates this answering；
3) judge that the mode bit in protocol frame, the polling status position of host inquiry protocol frame indicate that last time host receives the number of slave
According to correctness, no matter whether slave replys, and host can inquire next slave when next timeslice starts, and solves host
Not the problem of not receiving slave response and repeatedly asking；Host starts to inquire that a slave takes to slave data back to host
4-6ms or so, in addition data processing time, each slave interval of host computer polls is set in 10ms, and slave receives inquiry agreement
Conditional code in judging after frame, if mode bit illustrates that host last time has been properly received the data of the machine for 1, local new
Data and serial number 1 transmit to host from increasing；If mode bit is 0, step 4) is carried out；If it exceeds 10ms does not still have
There is response then to enter step 5) timeout treatment；
4) mode bit illustrates that host last time does not receive successfully the content of this slave for 0, and slave judges that last the machine is sent again
There are the protocol frame of data or the protocol frame of empty data to host；If it is the protocol frame for having data, then retransmission buffer
For the data of middle last time to host, serial number is constant, is otherwise the protocol frame of sky data, slave still send the protocol frames of empty data to
Host, serial number are constant；
5) timeout treatment, the speed that host distributes 10ms according to a slave point are polled；The mutual transmission association of principal and subordinate
The case where view frame will appear loss due to channel disturbance.The protocol frame of each transmission data of host all starts timer and starts to count
When；When host inquiry protocol frame is sent out, timer starts timing, sentences when not receiving slave response more than setting time 10ms
Length can be arranged according to network load, channel disturbance concrete condition in disconnected time-out, timeouts time.0 explanation of polling status position
Response is not received, and next poll is retransmitted；1 is set if receiving response, corresponding slave timer stops timing, and step process is shown in
Fig. 2.
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| CN110138882A (en) * | 2019-06-10 | 2019-08-16 | 中国人民解放军海军工程大学 | The means of transport queue means of communication and system |
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| CN113691322A (en) * | 2021-08-20 | 2021-11-23 | 青岛鼎信通讯股份有限公司 | Communication system and communication method applied to low-voltage leakage locator |
| CN115855028A (en) * | 2023-02-22 | 2023-03-28 | 广州导远电子科技有限公司 | Navigation data analysis method and device, electronic equipment and storage medium |
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| CN110138882A (en) * | 2019-06-10 | 2019-08-16 | 中国人民解放军海军工程大学 | The means of transport queue means of communication and system |
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| CN113691322A (en) * | 2021-08-20 | 2021-11-23 | 青岛鼎信通讯股份有限公司 | Communication system and communication method applied to low-voltage leakage locator |
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| CN115855028A (en) * | 2023-02-22 | 2023-03-28 | 广州导远电子科技有限公司 | Navigation data analysis method and device, electronic equipment and storage medium |
| CN115855028B (en) * | 2023-02-22 | 2023-11-03 | 广州导远电子科技有限公司 | Navigation data analysis method, device, electronic equipment and storage medium |
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Application publication date: 20181016 |