CN106506119B - A kind of RTU reliable data transmission control method of narrowband nonsymmetric channel - Google Patents
A kind of RTU reliable data transmission control method of narrowband nonsymmetric channel Download PDFInfo
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- CN106506119B CN106506119B CN201611033224.8A CN201611033224A CN106506119B CN 106506119 B CN106506119 B CN 106506119B CN 201611033224 A CN201611033224 A CN 201611033224A CN 106506119 B CN106506119 B CN 106506119B
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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
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
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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
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0006—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format
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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
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1806—Go-back-N protocols
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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
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1867—Arrangements specially adapted for the transmitter end
- H04L1/1874—Buffer management
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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
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1867—Arrangements specially adapted for the transmitter end
- H04L1/188—Time-out mechanisms
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Quality & Reliability (AREA)
- Communication Control (AREA)
Abstract
The invention discloses a kind of RTU reliable data transmission control methods of narrowband nonsymmetric channel, comprising using " definite value storage is sent ", " timing storage is sent ", " data mend biography automatically ", " having sent delay to wait " technical method, by adjusting packet size, interval and sending times are sent, control transmission rate.With this method, the key factor that RTU is successfully transmitted data can be controlled in the case where the message that happens suddenly increases, enhances the control ability of RTU communication protocol.On the one hand the delay of adjustment different channels waits parameter and maximum packet length, on the other hand, the completion to successful data is not sent out automatically.The present invention effectively increases the reliability of asymmetric low rate channel near-realtime data.
Description
Technical field
The present invention relates to fields of communication technology, in particular to one kind can suitable for RTU in uplink and downlink channel asymmetry situation
By data transfer control method.
Background technique
Modern digital communication system frequency spectrum is concentrated mainly between 300KHz to 5GHz, especially 500KHz to 2GHz it
Between frequency range using more dense, the wherein long wave of 300KHz-300MHz, medium wave, shortwave and ultra short wave communication, direct transmission range
In several hundred-thousands of kilometers, traffic rate difference is very big.Using these means of communication, sender and recipient can be can sighting distances
Data transmission is completed from direct communication in range, or via seldom relaying.This communication pattern is standing to set uplink and downlink channel not
Same bandwidth to guarantee that data volume has biggish bandwidth compared with the channel of general orientation, and is used for transmission the reversed of the orders such as request
Then bandwidth is smaller for channel.
Due to history and cost, in hydrographic water resource acquisition system, there is a large amount of asymmetry low speed to believe
Road, remote measurement and control terminal system (RTU) is in practical applications, it may appear that the letter that telemetry command and monitoring data pass through different bandwidth
The phenomenon that road is transmitted, i.e., so-called up channel (toward data center direction) and down channel (toward telemetry station direction) information content
With the asymmetry of analysis mode.In face of more element telemeterings, these channels cannot be guaranteed the reliable transmission of uplink information.
Summary of the invention
Goal of the invention: being directed to the above-mentioned prior art, proposes a kind of RTU reliable data transmission control of narrowband nonsymmetric channel
Method guarantees the efficiency of transmission and reliability of narrowband nonsymmetric channel in RTU data transmission procedure.
Technical solution: a kind of RTU reliable data transmission control method of narrowband nonsymmetric channel includes the following steps:
Step (1), configuration data sending strategy parameter: storing data for sending in buffer area, setting, which executes, sends behaviour
Make the trigger condition on opportunity, the trigger condition includes that definite value storage transmission and timing storage are sent；
The definite value storage is sent are as follows: the first counter of setting, count value are the message of hydrographic water resource measured data
Number, the message number come from single or multiple data acquisition units, and the threshold value of first counter is big according to buffer area
It is small to be configured, it is executed when count value reaches the preset threshold of the first counter and sends operation；
The timing storage is sent are as follows: the second counter of setting is timer, is wanted when reaching hydrographic water resource monitoring business
It is executed when the real-time report time asked and sends operation；Wherein, the real-time report time of business need is monitored according to hydrographic water resource,
The threshold value of second counter is one or more；
Step (2), the priority and its correlation that setting sending strategy executes: the environment being arranged according to RTU works as data
When data are reached transmission buffer area according to the preset time interval by acquisition unit, pre-selects individual data message and send mould
Formula or definite value storage are sent and timing storage sends matching model；
The individual data message sending mode are as follows: just sent immediately when there is data to reach transmission buffer area；
Definite value storage is sent and timing storage sends matching model are as follows: when there is the data message of multiple acquisition units same
When reach send buffer area when, if second counter reach threshold value if immediately by buffer area data all send, if institute
It states the second counter and does not reach threshold value, when temporal data message number reaches first counter threshold in pending buffer area,
Transmission operation is executed again；
Step (3) sets and has sent the delay waiting time: defining response threshold value over time limit as Tout, sent delay and waited
Time restriction threshold value is Twai；When having sent a data, start response timer, as practical response time tr<
Tout, expression system be normally received other side feedback it is correct confirm or error confirmation information；As practical response time tr≥
Tout, indicate response time-out, then log-on data mends biography automatically；
Delay waiting time T' is sentwaiDynamic is adjusted to T'wai=Twai+2αTout, α is adjustment factor, is taken as the following formula
Value:
Wherein, k indicates that response timeout datum is mended automatically and passes number, if response timeout datum mends biography automatically, number is more than 3 times
Then α value is taken by 3 times；ToutValue using TCP self-contained time window adjustment algorithm adjustment；
Step (4), data mend transmission control system automatically: data are transferred to after sending and repay buffer area by single data, if system
The error confirmation information or response time-out for receiving other side's feedback, then sent delay waiting time T' describedwaiAfter arrival again
Send data；Setting data are mended automatically passes frequency threshold value, stops retransmission Data Concurrent after reaching threshold value and goes out warning message；
System removes the data repaid in buffer area after receiving the correct confirmation message that other side feeds back.
The utility model has the advantages that the present invention is by " definite value storage is sent ", adjustment sends packet size；It " is periodically deposited by setting
Storage is sent " and change " having sent the delay waiting time ", it adjusts and sends interval, control transmission rate, " data are mended automatically for cooperation
Pass " mechanism, guarantee the efficiency of transmission and reliability of narrowband nonsymmetric channel.In this method, higher uplink bit rate is according to reality
When situation change, may be implemented specific data it is timely send, specific data is not regularly sent, to adapt to regimen variation
When business rule.Since the bandwidth of RTU Transmission system arranged at present is limited, in data loading error occurring, this method
By adjusting the interval time of each autonomous retransmission reduction transmission rate, situations such as blocking with this adaptive channel；In addition, may be used also
With by adjusting packet size, transmission interval and sending times, i.e. communication module can be according to the communication condition dynamic at scene
Data Transmission Controlling parameter is adjusted to control transmission rate, so as to support the asymmetrical communication environment in scene.With the party
Method can be successfully transmitted data by control RTU in the case where the message that happens suddenly increases, enhance the control ability of RTU communication protocol.
Detailed description of the invention
Fig. 1 is step schematic diagram of the invention；
Fig. 2 is to send control logic relational graph.
Specific embodiment
Further explanation is done to the present invention with reference to the accompanying drawing.
A kind of RTU reliable data transmission control method of narrowband nonsymmetric channel, narrowband nonsymmetric channel can be common
Shortwave, ultrashort wave, GPRS and PSTN, the specific steps are as follows:
Step (1), configuration data sending strategy parameter: storing data for sending in buffer area, setting, which executes, sends behaviour
Make the trigger condition on opportunity, trigger condition includes that definite value storage transmission and timing storage are sent.The business of data is acquired according to RTU
It is required that a kind of strategy can be specified when initiation parameter configures.
Definite value storage is sent are as follows: and the first counter of setting, count value are the message number of hydrographic water resource measured data,
Message number comes from single or multiple data acquisition units.Hydrographic water resource message format is referring to professional standard, for multipurpose
RTU needs the needs of meeting a variety of hydrographic water resource data while reaching, transmitting together.The present invention and character type control protocol
It is consistent, is used as counter using a byte (8), virtual value is 1~255；The threshold value of first counter is according to buffering
Area's size is configured, and is executed when count value reaches the preset threshold of the first counter and is sent operation.
Timing storage is sent are as follows: the second counter of setting is timer indicator, is matched with system clock, when arrival water
It is executed when the real-time report time of Wenshui monitoring resource business need and sends operation, such as report, least bit report and encryption on schedule per hour
Report etc., encryption report are to increase in flood season to observe and predict concentration, such as every 10 minutes.Wherein, business need is monitored according to hydrographic water resource
The real-time report time, the threshold value of the second counter is one or more, the present invention using one byte (8) as counting when
Device, virtual value are 1~255, and unit is minute.High two instructions: 00- not timing, 01- are reported on schedule per hour, 10- least bit report,
11- encryption report；Low 6 instructions encryption report relative spacing minute value.
Step (2), the priority and its correlation that setting sending strategy executes: the environment being arranged according to RTU works as data
When data are reached transmission buffer area according to the preset time interval by acquisition unit, pre-selects individual data message and send mould
Formula or definite value storage are sent and timing storage sends matching model.
Individual data message sending mode are as follows: just sent immediately when there is data to reach transmission buffer area.This mode is simple
It is easy, but do not adapt to early warning, a RTU to a multisensor simultaneously data report and submit situations such as.
Definite value storage is sent and timing storage sends matching model are as follows: when the data message for having multiple acquisition units while being arrived
Up to when sending buffer area, data in buffer area are all sent immediately if the second counter reaches threshold value, if the second counter
Threshold value is not reached, when temporal data message number reaches first counter threshold in pending buffer area, then executes transmission behaviour
Make, i.e., arrives first the principle starting first carried out according to " definite value " and " timing " threshold value and send.
Step (3), for reliable data transmission, using the connection-oriented transmission control technology of TCP, in a data
Block will wait the confirmation message of recipient after sending.Since narrowband wireless signal-path band width is low, RTU is allowed for according to actual channel
Bandwidth adjustment transmission rate.The size of usual transmission rate can be controlled by means of sending the size at interval, i.e., between transmission data
Longer every the time, average transmission rate is lower.The present invention has sent the delay waiting time by setting, adjusts transmission rate, tool
Body are as follows:
Definition response threshold value over time limit is Tout, having sent delay waiting time threshold limit is Twai.A number is sent
According to when, start response timer, as practical response time tr<Tout, expression system be normally received other side feedback just
Confirmation or error confirmation information；As practical response time tr≥Tout, indicate response time-out, do not receive other side's feedback
Any confirmation message, then log-on data mends biography automatically.
Delay waiting time T' is sentwaiDynamic is adjusted to T'wai=Twai+2αTout, α is adjustment factor, is taken as the following formula
Value:
Wherein, k indicates that response timeout datum is mended automatically and passes number, if response timeout datum mends biography automatically, number is more than 3 times
Then α value is taken by 3 times.T'waiAnd ToutIt is relative time, in seconds；The timer threshold T that timing storage is sentperIt is absolute
Time, when shaped like xx: xx points, making for 24 hours.ToutIt can also be adjusted according to the case where response message, TCP can be used certainly in value
The time window adjustment algorithm adjustment for including.
Step (4), data mend transmission control system automatically: data are transferred to after sending and repay buffer area by single data, if system
The error confirmation information or response time-out for receiving other side's feedback, then sending delay waiting time T'waiIt is retransmitted after arrival
Data.It is not all that can be solved by weight method, as channel-failures, recipient are soft in view of causing the reason of sending failure very much
Part or equipment fault etc., therefore set data and mend biography frequency threshold value automatically, stop retransmission Data Concurrent after reaching threshold value and goes out
Warning message, report upper layer software (applications) processing.System removes the number repaid in buffer area after receiving the correct confirmation message that other side feeds back
According to.
Fig. 1 is basic step schematic diagram of the invention, is sent by the configuration of data sending strategy, data and executes, sends state
The data determine, adjusted in the case of having sent delay waiting time and failure mend the part such as biography composition automatically.
Data sending strategy configuration module receives the buffer-stored number of " definite value storage is sent " counter of initializing set
According to the time value T of message number N and " timing storage is sent "per, and/timing is started counting according to system boot operating instruction, one
Denier reaches threshold value and issues corresponding processing request.Data send execution module and are responsible for receiving the sending of data sending strategy configuration module
Processing request signal determine this data area sent and according to preset dominance relation, call data transmission program,
Buffer data is sent, and data will have been sent moves to and repaid buffer area.It has sent delay waiting time adjustment module and has received " weight
New calculate sends waiting time T'wai" instruction, it carries out new value and calculates.Data mend transmission module automatically and receive " retransmission data " instruction,
Wait T'waiAfter duration, data transmission program is called, retransmits the data for repaying buffer area, once correct send, removes and mends
The data for reporting buffer area, otherwise report an error to upper-layer protocol software.
In addition, the threshold value of all counters in this law, response threshold value over time limit, and sent delay waiting time limit
Threshold processed can carry out real time modifying according to downlink control command in control, realize that resource telemetry system in Wenshui is ordered according to downlink
It enables dynamic configuration call together and surveys the parameters such as element, time.
Fig. 2 is transmission control logic relational graph of the invention, and wherein solid line is control line, and dotted line is data line.The present invention
The comprehensive transmission controlling mechanism combined using data, Time And Event, by adjusting buffering message number, timed sending time,
Waiting time to transmission rate and continuously transmits message number and controls.In not specified sending time, using individual data
Message sending mode is sent, i.e., certain types of data (such as water quality data) reach RTU, is just sent immediately；Time trigger is sent,
Refer to that specific timer reaches preset time value Tper, starting transmission；Event triggering is sent, and refers to that buffering message number reaches preset
When " definite value storage is sent " value N, starting is sent.Time And Event control is also embodied in response time-out and receives transmission error check
After information, the adjustment of waiting delay time is carried out, and start re-transmission." definite value storage is sent " and " timing storage is sent " is according to corresponding
Event and time first come first served basis execute transmission.
The program developed according to the present invention is curable in the data transmission unit of hydrographic water resource acquisition RTU, with complete machine
The units such as shared power supply, CPU and memory.System initialization is carried out first, and data sending strategy parameter, including buffering message are set
Number N, " timing storage is sent " time value Tper, sent delay waiting time threshold limit Twai, response timeout value Tout；So
Afterwards, activation system waits sensor or data to be sent to reach to operational mode；Once certain types of data, time or thing
Part handles signal arrival, triggers corresponding control program work, is automatically performed data and sends and the adjustment of subsequent control parameter.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (1)
1. a kind of RTU reliable data transmission control method of narrowband nonsymmetric channel, which comprises the steps of:
Step (1) configuration data sending strategy parameter: stores data for sending, when setting executes transmission operation in buffer area
The trigger condition of machine, the trigger condition include that definite value storage transmission and timing storage are sent；
The definite value storage is sent are as follows: and the first counter of setting, count value are the message number of hydrographic water resource measured data,
The message number comes from single or multiple data acquisition units, and the threshold value of first counter is carried out according to buffer size
Setting executes when count value reaches the preset threshold of the first counter and sends operation；
The timing storage is sent are as follows: the second counter of setting is timer, monitors business need when reaching hydrographic water resource
It is executed when the real-time report time and sends operation；Wherein, the real-time report time of business need is monitored according to hydrographic water resource, it is described
The threshold value of second counter is one or more；
Step (2), the priority and its correlation that setting sending strategy executes: the environment being arranged according to RTU, when data acquire
When data are reached transmission buffer area according to the preset time interval by unit, individual data message sending mode is pre-selected, or
Definite value storage is sent and timing storage sends matching model；
The individual data message sending mode are as follows: just sent immediately when there is data to reach transmission buffer area；
The definite value storage is sent and timing storage sends matching model are as follows: when the data message for having multiple acquisition units while being arrived
Up to when sending buffer area, data in buffer area are all sent immediately if second counter reaches threshold value, if described the
Two counters do not reach threshold value, when temporal data message number reaches first counter threshold in pending buffer area, then hold
Row sends operation；
Step (3) sets and has sent the delay waiting time: defining response threshold value over time limit as Tout, sent the delay waiting time
Threshold limit is Twai；When having sent a data, start response timer, as practical response time tr<Tout, table
Show that system is normally received correct confirmation or the error confirmation information of other side's feedback；As practical response time tr≥Tout, indicate
Response time-out, then log-on data mends biography automatically；
Delay waiting time T' is sentwaiDynamic is adjusted to T'wai=Twai+2αTout, α is adjustment factor, as the following formula value:
Wherein, k indicates that response timeout datum is mended automatically and passes number, mends and passes if number is more than 3 times by 3 automatically if response timeout datum
It is secondary to take α value；ToutValue using TCP self-contained time window adjustment algorithm adjustment；
Step (4), data mend transmission control system automatically: data are transferred to after sending and repay buffer area by single data, if system receives
The error confirmation information or response time-out of other side's feedback, then sent delay waiting time T' describedwaiIt is retransmitted after arrival
Data；Setting data are mended automatically passes frequency threshold value, stops retransmission Data Concurrent after reaching threshold value and goes out warning message；System
The data repaid in buffer area are removed after receiving the correct confirmation message of other side's feedback.
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| JP6962599B2 (en) | 2017-04-24 | 2021-11-05 | ホアウェイ・テクノロジーズ・カンパニー・リミテッド | Client service transmission method and device |
| CN107707640A (en) * | 2017-09-25 | 2018-02-16 | 深圳市盛路物联通讯技术有限公司 | A kind of Point-to-Point Data Transmission method and apparatus |
| CN108111259A (en) * | 2017-12-28 | 2018-06-01 | 北京航天晨信科技有限责任公司 | One kind is used for narrow band data method for reliable transmission |
| CN111464358B (en) * | 2020-04-02 | 2021-08-20 | 深圳创维－Rgb电子有限公司 | Message reporting method and device |
| CN111935218A (en) * | 2020-07-02 | 2020-11-13 | 云南电网有限责任公司 | Power grid data efficient reporting method based on multi-channel performance perception |
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| CN102724025A (en) * | 2004-06-10 | 2012-10-10 | 美商内数位科技公司 | Wireless transmit/receive unit and method |
| CN105914753A (en) * | 2016-05-25 | 2016-08-31 | 成都信息工程大学 | Active distribution network (ADN) voltage real-time fuzzy control method |
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| KR101000699B1 (en) * | 2004-04-19 | 2010-12-10 | 엘지전자 주식회사 | Data handling method in radio linl comtrol layer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102724025A (en) * | 2004-06-10 | 2012-10-10 | 美商内数位科技公司 | Wireless transmit/receive unit and method |
| CN105914753A (en) * | 2016-05-25 | 2016-08-31 | 成都信息工程大学 | Active distribution network (ADN) voltage real-time fuzzy control method |
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