CN101360028B - Real-time scheduling method suitable for industrial sensor network - Google Patents
Real-time scheduling method suitable for industrial sensor network Download PDFInfo
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- CN101360028B CN101360028B CN2008100485064A CN200810048506A CN101360028B CN 101360028 B CN101360028 B CN 101360028B CN 2008100485064 A CN2008100485064 A CN 2008100485064A CN 200810048506 A CN200810048506 A CN 200810048506A CN 101360028 B CN101360028 B CN 101360028B
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Abstract
The invention provides a real time scheduling method, relating to the industrial wireless sensor network real time communication control field. The method is characterized in that a superframe structure is established on a network central node; the superframe structure divides the work of a control layer of the sensor network into a plurality of access control periods, and issues the superframe structure in the network; common nodes with priority traffic apply to the central node for reservation bandwidth; the network central node conducts scheduling process according to the applied traffic priority to establish the reservation bandwidth part in the superframe structure and informs the common nodes of the corresponding reservation bandwidth information in the superframe structure; after the common nodes receive the requesting response information, the common nodes establish respective starting and ending time of the reservation bandwidth in the way of a timer; and controlled by the timer, the common nodes and the network central node go into the working mode of one to one to communicate. With the invention adopted, a real time scheduling method with priority can be provided for the control layer of the industrial sensor network, so real time application of the security class, the control class and the monitoring class in the industrial environment can be met and interactive delay of the real time data can be reduced.
Description
Technical field
The present invention relates to electronic applications, sensing network, industrial application, relate in particular to a kind of Real-Time Scheduling strategy in industrial application.
Background technology
Along with the development of industrial monitoring technology, feature such as the low cost of wireless sensor network, easy-to-use and ubiquitous perception has more and more occupied consequence in the middle of industry.Industry is also more and more tightr with combining of sensing net, utilize the sensor network people to realize the full-range comprehensive monitoring of industry with lower investment and use cost, obtain tradition owing to the cost reason can't on-line monitoring the essential industry procedure parameter, and implement optimal control based on this, reach and improve the quality of products, reduce the evaporating, emitting, dripping or leaking of liquid or gas in the industrial processes, the target of raising energy efficiency.
Many different application are arranged under industrial environment, and according to the different requirements of using the time, these application roughly are divided three classes: security classes, control class, monitoring class.Wherein, the security classes business need has very high real-time, and this application requirements perseverance is crucial.Other application is necessary for this business and reserves fixing bandwidth.And this business can not be subjected to the interference of other business.The second class business is exactly to control class, comprises closed loop control adjusting system business, closed loop Supervised Control and open loop control.Wherein closed-loop adjustment control it has been generally acknowledged that its real-time will be higher than other two control class business, is only second to the business of security classes, sometimes even can be used as the security classes business and consider.Closed loop Supervised Control business it has been generally acknowledged that and not be very crucial, needs high priority once in a while.Open loop control is by Artificial Control, and it often depends on the setting of thinking to the requirement of time.The third window, just the class business that real-time is minimum comprises the business that does not produce the operating result of direct result based on the maintenance service of incident and record and download, these two business do not have very high requirement concerning real-time, be not subjected to the constraint of time basically.In the middle of commercial Application, different application is to the requirement difference of time, and this just needs a kind of Real-Time Scheduling mechanism to satisfy the demand of industrial sensor network.
Summary of the invention
Technical problem to be solved by this invention provides a kind of real-time scheduling method that is applicable to industrial sensor network, make existing sensing network better application in the real-time industrial environment, reduce the delay of industrial real-time service, improve the efficient of sensing network MAC layer.
For solving the problems of the technologies described above, a kind of real-time scheduling method that is applicable to the industrial sensor network provided by the invention may further comprise the steps:
Step 1: on the industrial sensor network Centroid, create superframe structure, described superframe structure is divided into some equal time slots, this time slot is divided into three parts, and first freely inserts part, is used for the control communication of the network equipment and the free access of network node; Second portion is the bandwidth reserved part, is used for the communication of the very high commercial Application business of real-time; Third part is used to demarcate the border of described superframe structure for delimiting the mark part;
This superframe structure is that axle is divided into some access control cycle with time with the sensing network MAC layer work of Centroid, life period interval between the access control cycle, and this gap size is an adjustable parameter;
Network center's node is distributed on described superframe structure in the network, the network ordinary node can only the receiving center node send about superframe structure information;
Step 2: industrial wireless sensing net Centroid is mapped to commercial Application the service priority of MAC layer according to the commercial Application needs;
Step 3: when industrial business had higher professional of real-time, the conventional equipment node of industrial sensor network freely inserted part to keep out of the way avoidance mechanism to network center's node application bandwidth reserved by described superframe structure;
Step 4: after network center's node was received the request of ordinary node application bandwidth reserved, network center's node was not replied request immediately, but according to the service priority that application information provided, will ask to come respectively in the different priorities formation;
Step 5: when all queue fulls or after through an official hour, network center's node, processing is dispatched according to priority order from high to low by each priority query, promptly apply for asking bandwidth reserved, in superframe structure, set up the bandwidth reserved part according to the conventional equipment node;
Step 6: network center's node sends request-reply information to ordinary node, will set up the ordinary node of good superframe structure bandwidth reserved information notice application bandwidth reserved;
Step 7: after ordinary node receives the request-reply information that Centroid sends, in MAC layer database separately, set up separately bandwidth reserved start and end time by timer;
Step 8: under described timer control, ordinary node and network center's node enter man-to-man mode of operation and communicate, and other ordinary nodes all can not communicate in this moment and network center's node;
Step 9: when ordinary node finish using distribute to its bandwidth reserved by Centroid after, ordinary node can propose to continue to use or discharge the request of bandwidth reserved as required; If ordinary node is not made any request to Centroid in certain official hour, then network center's node will force to discharge the bandwidth reserved of this ordinary node in the superframe structure; When all conventional equipments are not all applied for bandwidth reserved, network center's node will not distribute any bandwidth reserved, have only the part of freely inserting in the middle of the described superframe structure and delimit the mark part, and bandwidth reserved part size is zero.
As optimization, described step 4, network center's node will ask to come respectively in the different priorities formation according to the service priority that application information provided, and also comprise the following steps:
Request in the Low Priority Queuing can be transferred to the formation of higher priority because request number of times reaches a certain request number of times threshold value; When request number of times drops to less than this threshold value, return in the formation of original priority.
Further optimize, described step 5 is set up bandwidth reserved part method in superframe structure be bandwidth reserved according to the application of conventional equipment node, with the time slot of described superframe structure be divided into some after, with some communication request that satisfy the conventional equipment node after as the bandwidth reserved part.
As preferred version, in step 1, described after network center's node is created superframe structure, as required, can cancel freely inserting partly and the bandwidth reserved part in the superframe structure at the Centroid of industrial sensor network, just preserve to delimit and mark part, be used for carrying out periodic synchronous.
Adopt above-mentioned can be for the industrial sensor network MAC layer provides a real-time scheduling method with priority, thereby can satisfy the real-time application of security classes in the middle of the industrial environment, control class, monitoring class, reduce the mutual delay of real time data.
Description of drawings
Below in conjunction with the drawings and specific embodiments technical solution of the present invention is described in further detail.
Fig. 1 is an industrial sensor network real-time scheduling method flow chart of the present invention.
Fig. 2 is the superframe structure figure of real-time scheduling method of the present invention;
Fig. 3 is a real-time scheduling method solicited message structure chart of the present invention;
Fig. 4 is the professional mapping graph of real-time scheduling method of the present invention;
Fig. 5 is real-time scheduling method request queue figure of the present invention;
Embodiment
Figure 1 shows that industrial sensor network real-time scheduling method flow chart of the present invention.Step S01 as shown in Figure 1, network is at the structure initial stage, Centroid by industrial sensor network makes up superframe structure, and the superframe structure that builds sent in other ordinary nodes in the middle of the network go, ordinary node is synchronous with network center's node by the demarcation mark that obtains in the middle of the superframe structure.
After ordinary node periodically obtains to delimit mark, just can freedom of entry insert part, in this section ordinary node can be free, at random, the transmission solicited message as shown in Figure 2 of competition arrives network center's node.
The superframe structure figure that real-time scheduling method of the present invention provided as shown in Figure 2.This superframe structure comprises that three are wanted part: freely insert part, bandwidth reserved part and delimit the mark part.This superframe structure is produced, changes and eliminated by the Centroid of industrial sensor network fully.
In this specific embodiment, superframe structure is divided into 0 to 15 equal time slot, as required, these time slots can also be carried out evenly waiting once more the demand of assigning to satisfy more ordinary node.
The main effect of delimiting the mark part be by Centroid to ordinary node delivery network information, the network information comprise delimit mark, freely insert partly, bandwidth reserved structure arrangement and sequence of positions partly.Wherein, delimit the mark part and be positioned at beginning most of whole superframe structure, what and then delimit matrix section is freely to insert part, is freely inserting and then bandwidth reserved part of part end.Freely insert part be placed on bandwidth reserved partly be for ordinary node can freely inserts part free, at random, communicating of competing with the network center node.Freely insert in the part and can transmit solicited message, have only solicited message to obtain the successful processing of network center's node, and obtain the approval of bandwidth reserved, just can set up the bandwidth reserved part.
Get back to step S02 shown in Figure 1, industrial wireless sensing net Centroid is according to the commercial Application needs, commercial Application is mapped to the service priority of MAC layer, as shown in Figure 4, in the middle of commercial Application, exist security classes, control class, monitoring class to use, these are used according to the emergency that requires to the time, be divided into 6 classes from high to low successively, the professional correspondence of the MAC layer of industrial sensor network is divided into 6 classes, and corresponding relation is as follows respectively: the corresponding MAC layer FC-1 of industrial 0 class emergency action business; The corresponding MAC layer SC-1 of industry 1 class closed-loop adjustment class business; Industry 2 class closed loops are supervised corresponding MAC layer SC-2 business; Corresponding MAC layer SC-3 class business is controlled in industry 3 class open loops; Industry 4 class incidents are safeguarded corresponding MAC layer TC-1 business; Industry 5 classes are uploaded the corresponding MAC layer TC-2 business of downloading.Wherein the corresponding security classes business of FC, the corresponding control of SC class business, TC correspondence detect monitoring service.
Carry out step S03 shown in Figure 1 then, when industrial business had higher professional of real-time, the ordinary node of industrial sensor network freely inserted part to keep out of the way avoidance mechanism to network center's node application bandwidth reserved by described superframe structure.
Figure 3 shows that the ordinary node solicited message figure of real-time scheduling method of the present invention.As can be seen from Figure 3, the structure of this solicited message is made up of three parts, is respectively frame head, frame payload, postamble.Wherein, frame head comprises three parts: frame control domain, frame number, address field; Frame payload partly comprises bandwidth reserved and information load; This portion comprises frame check.
The identifying information that frame head partial frame control domain has comprised whole network frame reduces other network interferences, and frame number shows which application information is this application information belong to, and address field has identified the source address of network and the correspondence of destination address.
The bandwidth reserved of frame payload part has identified the time started and the time span of application protection bandwidth, and these two parameters all are that to form a parameter by little beacon interval as shown in Figure 1 right, and it is right to be referred to as beginning-length parameter.Two bandwidth reserveds as shown in Figure 1 with beginning-length parameter to being expressed as: (10,3) and (14,2).
Postamble is partly taked a kind of verification scheme, is used for increasing the reliability of request message transmission, reduces the interference of other network informations.
Continue to carry out step S04 shown in Figure 1, when network center's node in the middle of a superframe structure, receive many request bandwidth reserved information from different ordinary nodes the time, the business mapping of network center's node basis, all requests are mapped as the MAC layer business of different priorities, then these solicited messages are carried out the queuing of different queue according to the difference of priority.
As shown in Figure 5, real-time scheduling method request queue figure for the specific embodiment of the invention, carry out FC request queue, SC request queue, TC request queue in conjunction with FC shown in Figure 4, SC, TC three class business respectively at the Centroid of industrial sensor network, when queue full or stipulated time reach, network center's node carries out priority scheduling to these three formations, and the dispatching sequence is followed successively by FC request, SC request, TC request.The priority of this three classes request is followed successively by: FC is higher than SC, and SC is higher than TC.
Step S05 and for example shown in Figure 1, lined up when each formation and to have overflowed, perhaps a stipulated time overtime after, network center's node, processing is dispatched according to priority order from high to low by each priority query, promptly apply for asking bandwidth reserved, in superframe structure, set up the bandwidth reserved part according to the conventional equipment node.
Step S06, network center's node sends request-reply information to ordinary node, will set up the ordinary node of good superframe structure bandwidth reserved information notice application bandwidth reserved.
Step S07, after ordinary node received replying of Centroid, the timer that oneself just can be set to carry out synchronously with the bandwidth reserved of Centroid;
Step S08, when regularly overflowing, ordinary node just can carry out One-to-one communication with Centroid, and other ordinary nodes all can not communicate in this moment and network center's node.
Step S09, when the bandwidth reserved of finishing using, ordinary node extend request as required discharges the right to use to bandwidth reserved to the right to use of bandwidth reserved or application, if do not carry out any processing, after then network center's node overflowed a stipulated time, to force to reclaim bandwidth reserved, ordinary node will lose the right to use to bandwidth reserved.When all conventional equipments are not all applied for bandwidth reserved, network center's node will not distribute any bandwidth reserved, have only the part of freely inserting in the middle of the described superframe structure and delimit the mark part, and bandwidth reserved part size is zero.
Network center's node is for energy-conservation needs, and when not having real-time service to exist in the middle of the network, at the node execution in step S10 of network center, competition in the middle of superframe structure access part and bandwidth reserved are partly deleted, only keep and delimit the mark part, execution in step S11 then, ordinary node is periodically synchronous with Centroid by delimiting mark.
Claims (4)
1. real-time scheduling method that is applicable to industrial sensor network is characterized in that may further comprise the steps:
Step 1: on industrial wireless sensing net Centroid, create superframe structure, described superframe structure is divided into some equal time slots, this time slot is divided into three parts, and first freely inserts part, is used for the control communication of the network equipment and the free access of network node; Second portion is the bandwidth reserved part, is used for the communication of the very high commercial Application business of real-time; Third part is used to demarcate the border of described superframe structure for delimiting the mark part;
This superframe structure is that axle is divided into some access control cycle with time with the sensing network MAC layer work of Centroid, life period interval between the access control cycle, and this gap size is an adjustable parameter;
Network center's node is distributed on described superframe structure in the network, the network ordinary node can only the receiving center node send about superframe structure information;
Step 2: industrial wireless sensing net Centroid is mapped to commercial Application the service priority of MAC layer according to the commercial Application needs;
Step 3: when industrial business had higher professional of real-time, the conventional equipment node of industrial wireless sensing net freely inserted part to keep out of the way avoidance mechanism to network center's node application bandwidth reserved by described superframe structure;
Step 4: after network center's node was received the request of ordinary node application bandwidth reserved, network center's node was not replied request immediately, but according to the service priority that application information provided, will ask to come respectively in the different priorities formation;
Step 5: when all queue fulls or after through an official hour, network center's node is dispatched processing to each priority query according to priority order from high to low, promptly apply for asking bandwidth reserved, in superframe structure, set up the bandwidth reserved part according to the conventional equipment node;
Step 6: network center's node sends request-reply information to ordinary node, will set up the ordinary node of good superframe structure bandwidth reserved information notice application bandwidth reserved;
Step 7: after ordinary node receives the request-reply information that Centroid sends, in MAC layer database separately, set up separately bandwidth reserved start and end time by timer;
Step 8: under described timer control, ordinary node and network center's node enter man-to-man mode of operation and communicate, and other ordinary nodes all can not communicate in this moment and network center's node;
Step 9: when ordinary node finish using distribute to its bandwidth reserved by Centroid after, ordinary node can propose to continue to use or discharge the request of bandwidth reserved as required; If ordinary node is not made any request to Centroid in certain official hour, then network center's node will force to discharge the bandwidth reserved of this ordinary node in the superframe structure; When all conventional equipments are not all applied for bandwidth reserved, network center's node will not distribute any bandwidth reserved, have only the part of freely inserting in the middle of the described superframe structure and delimit the mark part, and bandwidth reserved part size is zero.
2. the real-time scheduling method that is applicable to industrial sensor network according to claim 1, it is characterized in that, described step 4, network center's node is according to service priority that application information provided, to ask to come respectively in the different priorities formation, comprise following method:
Request in the Low Priority Queuing can be transferred to the formation of higher priority because request number of times reaches a certain request number of times threshold value; When request number of times drops to less than this threshold value, return in the formation of original priority.
3. the real-time scheduling method that is applicable to industrial sensor network according to claim 1, it is characterized in that, described step 5 is set up the bandwidth reserved part in superframe structure method comprises, bandwidth reserved according to the application of conventional equipment node, with the time slot of described superframe structure be divided into some after, with some communication request that satisfy the conventional equipment node after as the bandwidth reserved part.
4. the real-time scheduling method that is applicable to industrial sensor network according to claim 1, it is characterized in that, in step 1, it is described after network center's node is created superframe structure, as required, freely inserting partly and the bandwidth reserved part in the Centroid cancellation superframe structure of industrial sensor network just preserved and delimited the mark part, is used for carrying out periodic synchronous.
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| CN103532877B (en) * | 2013-10-29 | 2016-06-29 | 华北科技学院 | A kind of dispatching method ensureing wireless sensor network information real-time Transmission |
| CN103929824A (en) * | 2014-03-26 | 2014-07-16 | 中国人民解放军总参谋部第六十三研究所 | Wireless network node neutral access dynamic configuration method |
| CN106330775A (en) * | 2015-06-30 | 2017-01-11 | 中兴通讯股份有限公司 | Bandwidth reservation parameter configuration method and device |
| CN105813218B (en) * | 2016-04-20 | 2019-05-07 | 江苏中科羿链通信技术有限公司 | The business scheduling method of wireless self-organization network |
| CN111406394A (en) * | 2018-02-12 | 2020-07-10 | Oppo广东移动通信有限公司 | Method and device for transmitting data |
| CN108616460A (en) * | 2018-04-27 | 2018-10-02 | 东莞理工学院 | A kind of sensor network data adaptation transmitter method and system |
| CN110831028B (en) * | 2018-08-10 | 2021-09-14 | 华为技术有限公司 | Method and device for controlling timer |
| CN109672607A (en) * | 2018-12-20 | 2019-04-23 | 东软集团股份有限公司 | A kind of email processing method, device and storage equipment, program product |
| CN109510658B (en) * | 2018-12-29 | 2021-06-15 | 湖北航天技术研究院总体设计所 | Networking access method, system and platform applied to multi-floating platform scene |
| CN111698721B (en) | 2019-03-11 | 2023-09-26 | 中国科学院沈阳自动化研究所 | Resource allocation method for coexistence of multiple linear topology industrial wireless networks |
| CN111405521B (en) * | 2020-03-25 | 2022-03-15 | 合肥工业大学 | Bandwidth reservation method for intelligent networked automobile TSN network sporadic messages |
| CN114640638A (en) * | 2020-12-16 | 2022-06-17 | 华为技术有限公司 | Message transmission method and sending terminal equipment |
| CN112511462B (en) * | 2020-12-17 | 2022-07-26 | 上海交通大学 | Software-defined industrial heterogeneous time-sensitive network system and resource scheduling method |
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| CN101184005A (en) * | 2007-03-16 | 2008-05-21 | 中科院嘉兴中心微系统所分中心 | Double cluster wireless sensor network based adaptive communication method |
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