CN106911593A - A kind of industrial control network array dispatching method based on SDN frameworks - Google Patents
A kind of industrial control network array dispatching method based on SDN frameworks Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/50—Queue scheduling
- H04L47/62—Queue scheduling characterised by scheduling criteria
- H04L47/625—Queue scheduling characterised by scheduling criteria for service slots or service orders
- H04L47/6275—Queue scheduling characterised by scheduling criteria for service slots or service orders based on priority
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/418—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM]
- G05B19/4185—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM] characterised by the network communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/50—Queue scheduling
- H04L47/62—Queue scheduling characterised by scheduling criteria
- H04L47/6215—Individual queue per QOS, rate or priority
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/50—Queue scheduling
- H04L47/62—Queue scheduling characterised by scheduling criteria
- H04L47/622—Queue service order
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Abstract
The invention provides a kind of industrial control network array dispatching method based on SDN frameworks.Carry out integrated data processing present invention incorporates time triggered and event trigger mechanism.Two major classes are splitted data into, a class is requirement of real-time highest industry control message；Another kind of refers to other data in industrial network, including audio, video and common monitoring data etc., and for every kind of data set priority.Odd even time triggered window is set, and alternately open, when primary sources window is opened can only transmission of control signals, the priority low transmission data high when secondary sources window is opened according to different types of data, wherein background data follows transmission mechanism of doing one's best.The design of time triggered window size concerns the performances such as the packet loss of data transfer time delay and whole network, therefore it is most important to set rational window size.The present invention has ensured the real-time and reliability of the industrial control network based on SDN frameworks.
Description
Technical field
The present invention relates to industrial time controlling network field, specifically a kind of industry based on SDN frameworks
Controlling network array dispatching method.
Background technology
With developing rapidly for the technologies such as control, communication, network, industrial control network technology has been obtained quickly
Development, covering scope is not limited solely to single factory, is more focused on from the field control of factory to enterprise
Integrated management, this brings new technological challenge to industrial network of future generation.Meanwhile, with Internet technology
Development, the application of software defined network (SDN) is more and more extensive, a kind of Industry Control based on SDN
The network architecture is increasingly paid close attention to by industry.
There are numerous types of data, including control data, voice data, video counts in industrial network of future generation
According to, Monitoring Data and other background datas, the requirement of real-time of every kind of data is different, it is necessary to propose a kind of real
When property security mechanism meets the QOS demands of different business.Industrial control network based on SDN is using soft
Part defines the characteristic of network control and forward separating, by the data forwarding side in controller centrally controlled network
Formula, is that different pieces of information distributes different priority, and data to different priorities are scheduled.
Queue priority is that the data of forwarding will be needed to be ranked according to priority orders, and then scheduler is excellent
The queue of high priority is first allowed first to forward.But the dispatcher of scheduler is formed with many kinds, different dispatchers
System can cause network performance, and great changes have taken place, therefore most important for the research of scheduling mechanism.It is current existing
Queue scheduling algorithm include SP (Strict-Priority, strict-priority), WFQ (Weighted Fair
Queue, Weighted Fair Queuing) and WRR (Weighted Round Robin, WRR queue).
The rapid emergence of industrial network of future generation causes the real time problems of the industrial network based on SDN increasingly
Attract attention, therefore propose that a kind of queuing scheduling mechanism suitable for the new network meets different business
Real-time transmission requirement is most important.
The content of the invention
For the industrial time controlling network based on SDN, the present invention proposes a kind of based on SDN frameworks
Industrial control network array dispatching method, the scheduling mechanism that is combined with the time using event meets industrial control
The requirement of real-time of data in network processed.
The technical scheme that is used to achieve the above object of the present invention is：It is a kind of double tactile based on Time And Event
Hair array dispatching method, comprises the following steps：
Step 1：After data send out from publishing side, log-on message is sent to the storage in controller first
Stored in unit, in case subsequent SUBSCRIBE end is subscribed to；
Step 2：After thering is subscription end to be sent to controller to subscribe to request, controller check in memory cell whether
There is the publishing side for meeting demand, success message is subscribed to if then being returned to subscription end, otherwise return to subscribe to and lose
Lose message；
Step 3：After subscribing to successfully, controller is calculated and meets needs according to transmitting terminal and the information of subscription end
Transmission path；
Step 4：Controller generates flow table information, is issued in the web-transporting device of the transmission path approach；
Step 5：Publishing side starts to send message to subscription end, after data enter web-transporting device, according to
Flow table information is by different types of data distribution to different queues；
Step 6：According to the time triggered state of the relevant queue stored in flow table, alternating opens or closes correspondence
Time window, control data queue outlet transmission state；
Step 7：Transmission decisions device changes to transmit according to the odd even of data priority mechanism and data transmission window
Data；
Step 8：Control data/other kinds of data are transmitted according to priority is transmitted when odd number window is opened,
Other kinds of data/transmission control data is transmitted according to priority when even number window is opened, to next biography
Repeat step 5 is to step 8 until the subscription information that subscription end obtains all needs from publishing side is after transfer device
Only.
The type of the data includes control data, voice data, video data, Monitoring Data, background number
According to and other data.
The data are divided into two major classes according to type, and a class is control data, possesses highest requirement of real-time；
Another kind of all data including in addition to control data, and according to priority from high in the end put in order for：
Voice data, video data, Monitoring Data, background data and other data.
Two kinds of dispatch states of queue of alternate time triggered state correspondence in the step 6：
One kind is q1:q2:q3:Q4=1000, represents only first time triggered door and opens, transmitting control data；
Another kind is q1:q2:q3:Q4=0111, represents the time triggered door in addition to first time triggered door
All open, transmit the data in addition to control data.
The alternating of the time triggered state is alternately present at the same time.
The trigger mechanism of the decision-making device includes that time triggered or event are triggered.
The time triggered refers to the transmission time window by controlling different types of data, controls the difference
Categorical data alternately sends.
Event triggering refers in placing data into different queues according to type of service, and sets not of the same trade or business
The priority of business, as the scheduling foundation in non-control time window.
Level that the control data possesses that All factors being equal, preference will be give to, paired domination number is according to entering line label, the hair of marking of control data
Send time slot and receive time slot, and then determine the sequencing that control data sends；The sending time slots and reception
Time slot is the time slot under the circulation time of publishing side, and the sending time slots are that transmitting terminal sends data when institute
Circulation time label, the reception time slot refers to where each forwarding unit sends the data in network
Circulation time label.
The transmission order for determining control data follows following rule：In the case of sending time slots difference,
Prioritised transmission sending time slots control data earlier；In the case of sending time slots identical, send and receive time slot
Control data earlier.
The size of the time window and the end-to-end time delay for being sized to influence data transfer of data frame.
The present invention has advantages below and beneficial effect：
1. the real-time queue scheduling problem of the industrial control network based on SDN frameworks is solved, difference is realized
The real-time transmitting of species business.
2. the present invention, using time and event dual trigger mechanism, is the different transmission queue of different business settings,
And data are sent by alt time window, realize real-time transmitting.
3. by real-time queue dispatching method, the propagation delay time and delay variation of data are reduced, meet difference
The requirement of real-time of business.
4. by the time-delay analysis of network transmission model, it is determined that the impact point of time delay is reduced, by data label
To realize that high-priority data first receives first to send mechanism, the number high as much as possible to reduce requirement of real-time
According to the time delay of business, the application demand of industrial scene is met.
Brief description of the drawings
Fig. 1 is the queue scheduling schematic diagram in forwarding unit of the invention；
Fig. 2 is the time-delay analysis schematic diagram of mode of the invention；
Fig. 3 is multi-service transport network topological diagram of the invention；
Fig. 4 is the data frame timing diagram of multi-hop transmission data queue scheduling of the invention；
Fig. 5 is queue scheduling flow chart of the invention.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clearly
Chu, it is fully described by, it is clear that described embodiment is only a part of embodiment of the invention, rather than
Whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not making creation
Property work under the premise of the every other embodiment that is obtained, belong to the scope of protection of the invention.
The present invention realizes the array dispatching method with Real-time Ability in industrial control network field, the work
Industry controlling network is based on software defined network framework, the queue scheduling schematic diagram such as Fig. 1 in forwarding unit
It is shown.Industrial control network based on SDN supports openflow agreements, and joining the team for data is realized by flow table
Go out team and storage forwarding etc..Controller centralized storage network is topological, register subscription information etc., and calculating is set out
Cloth end and the forward-path of subscription end.In order to ensure the real-time of multi-service data, forwarding is entered into data
Need to be fitted into different types of queue after equipment, the data in queue are passes of the present invention how outlet dispatches
The focus of note.
In the present invention propose array dispatching method by minimize the data frame residence time in a switch come
The end-to-end time delay of data is reduced, so as to meet control data real-time.Time shaft is divided into length by the method
Identical odd even time slot scheduling, the data for receiving are marked using slot index is received, and data frame sets in exchange
Residence time in standby is relevant with time slot scheduling width, and time slot scheduling width depends on control data most
Big frame length and maximum end-to-end time delay.Require that control data is most according to industrial control network related protocol
Long time delay is not more than 20 microseconds.
In order to meet the requirement of real-time of business, i.e., the time delay of network is reduced as far as possible, the present invention analyzes issue
The Time Delay Model of subscription end is held, as shown in Figure 2.As can be seen that data are sent out from transmitting terminal from accompanying drawing 2
Subscription end is sent to, Delay Factor includes：The Δ P of data processing time delay in publishing side from application layer to MAC layer,
And physical layer time delay Δ tx；Propagation delay Δ of the publishing side to interchangertrans；Physical layer receives number in switching equipment
According to the time delay Δ S to MAC layer portin；The flow table inquiry of switching equipment inside and relay forwarding time delay Δ Sprop；
Switching equipment exit port time delay Δ SoutWith Δ tx；Propagation delay Δ of the switching equipment to subscription endtrans；Subscription end
Processing delay Δ S from physical layer to application layer.Present invention time delay cardinal index of interest is exchanged according to from entrance
Time delay of the equipment between being sent from switching equipment.
The data type being related in the present invention includes control data, voice data, video data, test number
According to background data etc., data are divided into 4 kinds, i.e. control data, audio by case for the purpose of simplifying the description
Data, video data and other data, other data are using service mechanism of doing one's best.Given in table 1
The maximum frame sign of various data and the maximum end-to-end delay for allowing.
The multiple business information table of table 1
| Data type | Maximum frame sign | Maximum end-to-end time delay |
| Control data | 128bytes | 100us/5hops |
| Voice data | 256bytes | 2ms/7hops |
| Video data | 256bytes | 50ms/7hops |
| Other data | 256bytes | n.a. |
It is then used by the analysis multi-service industrial control network of the multi-service transport case macroscopic view shown in accompanying drawing 3
Information exchanging form.There are listed 4 kinds of business in table 1 in accompanying drawing 3, pub1 to sub3 is video
Data service；Pub2 to sub0 and pub4 to sub2 is control data business；Pub3 to sub1 is audio
Data service；Other data do not consider its requirement of real-time using transmission mechanism of doing one's best.From Fig. 3
It can be seen that S2 is core node, a plurality of Business Stream all passes through the node, scheduling of the packet in S2
Journey schematic diagram is as shown in Figure 1.
The scheduling timing diagram represented in accompanying drawing 4 is this stream of N2-S1-S2-N4 in Fig. 3, it is assumed that data flow
Data time sequence is as shown in the first row time shaft in figure during through link1, when data are by S1 to Article 2 link
When, sequential is as shown in the second row in Fig. 3.Compare front two row discovery, when control data (1,1) is by S1
Article 2 link label is reached afterwards to become (2,1).Two expression formula general structures in its bracket are (x, y),
Y represents the time slot where when data send, the time slot where when x represents data receiver.Add tagged purpose
It is out of order in order to prevent from producing in data is activation, and causes some data transfers delayed, can be with by tagging
Will be apparent that finding out that the packet comes from which time slot, the processing progress compared with other packets, therefore can be with
The packet slow to processing progress is entered into queue in advance after switching equipment is entered, to cause business of the same race
Processing speed it is roughly the same.In Fig. 4 S1 and S2 switching equipment treatment queue time window size not
Together, residence time of the size influence packet of time window in switching equipment, and then influence packet
Time delay, therefore the setting of time window size is most important.Control data energy can be substantially found out from Fig. 4
Enough transmittings, propagation delay time disclosure satisfy that transmission industrial control data in two circulation times are spaced
Requirement of real-time.
Business is analyzed from Successful transmissions whole process is registered to, the detail flowchart of dispatching method is given,
As shown in Figure 5.
Step 1：After data send out from publishing side, log-on message is sent to depositing in controller first
Stored in storage unit, in case subsequent SUBSCRIBE end is subscribed to；
Step 2：After having subscription end to send subscription request to controller, controller is checked in memory cell is
It is no to have the publishing side for meeting demand, success message is subscribed to if then being returned to subscription end, otherwise return and subscribe to
Failed message；
Step 3：After subscribing to successfully, controller is calculated and meets need according to transmitting terminal and the information of subscription end
The transmission path wanted；
Step 4：Controller generates flow table information, is issued in the web-transporting device of the transmission path approach；
Step 5：Publishing side starts to send message to subscription end, after data enter web-transporting device, root
According to flow table information by different types of data distribution to different queues；
Step 6：According to the time triggered state of the relevant queue stored in flow table, it is right that alternating is opened or closed
The time window answered, the transmission state of control data queue outlet；
Step 7：Transmission decisions device changes to pass according to the odd even of data priority mechanism and data transmission window
Transmission of data；
Step 8：Control data/other kinds of data are transmitted according to priority is transmitted when odd number window is opened,
Other kinds of data/transmission control data is transmitted according to priority when even number window is opened, to next biography
Repeat step 5 is to step 8 until the subscription information that subscription end obtains all needs from publishing side is after transfer device
Only.
Claims (9)
1. a kind of industrial control network array dispatching method based on SDN frameworks, it is characterised in that including
Following steps：
Step 1：After data send out from publishing side, log-on message is sent to the storage in controller first
Stored in unit, in case subsequent SUBSCRIBE end is subscribed to；
Step 2：After thering is subscription end to be sent to controller to subscribe to request, controller check in memory cell whether
There is the publishing side for meeting demand, success message is subscribed to if then being returned to subscription end, otherwise return to subscribe to and lose
Lose message；
Step 3：After subscribing to successfully, controller is calculated and meets needs according to transmitting terminal and the information of subscription end
Transmission path；
Step 4：Controller generates flow table information, is issued in the web-transporting device of the transmission path approach；
Step 5：Publishing side starts to send message to subscription end, after data enter web-transporting device, according to
Flow table information is by different types of data distribution to different queues；
Step 6：According to the time triggered state of the relevant queue stored in flow table, alternating opens or closes correspondence
Time window, control data queue outlet transmission state；
Step 7：Transmission decisions device changes to transmit according to the odd even of data priority mechanism and data transmission window
Data；
Step 8：Control data/other kinds of data are transmitted according to priority is transmitted when odd number window is opened,
Other kinds of data/transmission control data is transmitted according to priority when even number window is opened, to next biography
Repeat step 5 is to step 8 until the subscription information that subscription end obtains all needs from publishing side is after transfer device
Only.
2. a kind of industrial control network queue scheduling side based on SDN frameworks according to claim 1
Method, it is characterised in that the type of the data includes control data, voice data, video data, monitoring
Data, background data and other data.
3. a kind of industrial control network queue based on SDN frameworks according to claim 1 and 2 is adjusted
Degree method, it is characterised in that the data are divided into two major classes according to type, a class is control data, is possessed
Highest requirement of real-time；Another kind of all data including in addition to control data, and according to priority from height
On earth put in order for：Voice data, video data, Monitoring Data, background data and other data.
4. a kind of industrial control network queue scheduling side based on SDN frameworks according to claim 1
Method, it is characterised in that two kinds of dispatch states of queue of alternate time triggered state correspondence in the step 6：
One kind is q1:q2:q3:Q4=1000, represents only first time triggered door and opens, transmitting control data；
Another kind is q1:q2:q3:Q4=0111, represents the time triggered door in addition to first time triggered door
All open, transmit the data in addition to control data.
5. a kind of industrial control network queue based on SDN frameworks according to claim 1 or 4 is adjusted
Degree method, it is characterised in that the alternating of the time triggered state is alternately present at the same time.
6. a kind of industrial control network queue scheduling side based on SDN frameworks according to claim 1
Method, it is characterised in that the trigger mechanism of the decision-making device includes that time triggered or event are triggered；
The time triggered refers to the transmission time window by controlling different types of data, controls the difference
Categorical data alternately sends；
Event triggering refers in placing data into different queues according to type of service, and sets not of the same trade or business
The priority of business, as the scheduling foundation in non-control time window.
7. a kind of industrial control network queue scheduling side based on SDN frameworks according to claim 6
Method, it is characterised in that level that the control data possesses that All factors being equal, preference will be give to, paired domination number is marked according to line label is entered
The sending time slots and reception time slot of control data, and then determine the sequencing that control data sends；The hair
It is the time slot under the circulation time of publishing side to send time slot and receive time slot, and the sending time slots are transmitting terminal hairs
Circulation time label where when giving the data, the reception time slot refers to that each forwarding unit sends in network
Circulation time label where the data.
8. a kind of industrial control network queue scheduling side based on SDN frameworks according to claim 7
Method, it is characterised in that the transmission order of the determination control data follows following rule：In sending time slots not
In the case of, prioritised transmission sending time slots control data earlier；In the case of sending time slots identical,
Send and receive time slot control data earlier.
9. a kind of industrial control network queue scheduling side based on SDN frameworks according to claim 1
Method, it is characterised in that the size of the time window and the end for being sized to influence data transfer of data frame
To terminal delay time.
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| CN109729154B (en) * | 2018-12-13 | 2021-10-15 | 四川省能源投资集团有限责任公司 | Simple message subscription and publishing service method based on controller |
| CN112612745A (en) * | 2020-12-15 | 2021-04-06 | 海宁奕斯伟集成电路设计有限公司 | Data transmission method and device, electronic equipment and readable storage medium |
| CN112953803A (en) * | 2021-02-10 | 2021-06-11 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Airborne redundant network data transmission method |
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