CN101774391B - Topology control method for wireless sensing network of railway traffic - Google Patents
Topology control method for wireless sensing network of railway traffic Download PDFInfo
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- CN101774391B CN101774391B CN2009102145606A CN200910214560A CN101774391B CN 101774391 B CN101774391 B CN 101774391B CN 2009102145606 A CN2009102145606 A CN 2009102145606A CN 200910214560 A CN200910214560 A CN 200910214560A CN 101774391 B CN101774391 B CN 101774391B
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Abstract
The invention discloses an implementation method for a wireless sensing network of railway traffic, which comprises the following steps: firstly, dividing regions along railways needing to transfer train traveling information into a plurality of sections, and establishing a convergent node at each section; further dividing the section into M region blocks the length of which is 1; computing the number ni of wireless nodes needing to be arranged in each region block, thereby computing the distance di between every two wireless node pieces in each region block, wherein di is equal to 1/ni; uniformly arranging the wireless nodes in the middle of each region block according to the distance di, and sequentially configuring an ID number for each wireless node; enabling the wireless nodes to work and sleep by turns by using the region blocks as units; and enabling all wireless nodes in the sections to communicate with a control center for safe operation of trains through the convergent nodes in the sections. In the invention, the sectioned node arranging method is used for determining the optimal arranging distance between every two wireless nodes in the region blocks. The mechanism of working and sleeping by turns is adopted by the wireless nodes to effectively prolong the life cycle of the network and ensure the traveling safety of trains.
Description
Technical field
The present invention relates to a kind of wireless sense network field, be specifically related to a kind of topology control method that is used for the wireless sense network of railway traffic.
Background technology
Wireless sense network is brand new developing direction in the information science field, simultaneously also is new branch of science and traditional subject carries out the result of intersecting between the field.It is along with the technological advance in fields such as sensor, radio communication, embedded calculating, distributed treatment and microelectronics grows up.Wireless sense network is being brought into play great function on fields such as environmental monitoring, intelligent transportation, medical monitoring, city management, logistics management and building at present.
Wireless sense network is used in the railway traffic, has great significance for the safe in operation of train and the transmission of railway various train travel information along the line.For example, for the safe in operation of train, the situation of in the train driving process, carrying out speed limit often takes place.The China railways supervisory management zone has dual mode to the speed limit of train at present: intrinsic speed limit and temporary speed limitation.For the intrinsic speed limit in highway section, can be through vehicle-mounted LKJ device being set in advance to realize speed limit, this method has reduced artificial factor, has improved travel safety; And when railway needs temporary speed limitation owing to the perhaps interim construction of generation accident along the line; The running information of vehicle-mounted LKJ device storage can't in time obtain to upgrade; And inform that through placing the temporary speed limitation sign driver carries out temporary speed limitation and receives the influence of artificial and external factor bigger; Occur leaking problems such as identification and mistake identification easily, cause the generation of safety misadventure.
In this case; If subordinate's sensor wireless node carries out the speed limit zone for needs along the railway, by the radio node issue speed limit order of train operation control center in the zone; Speed limit order via being delivered in the purpose radio node with arranging along the railway radio node hop-by-hop; The train of process just can be read speed-limiting messages through the reader on the car, has so both reduced the trouble of human configuration, also can accurately efficiently the speed limit order be sent to the zone that needs speed limit simultaneously; Improve the safety of train operation, more be applicable to temporary speed limitation.
But, be applied to railway traffic if existing wireless sense network indiscriminately imitated, just each radio node arbitrarily is installed in the section that needs speed limit; Each radio node is all in running order always; And, just need really use the broadcast message of radio node owing in practical application, have only when this highway section of approaching train; This just makes radio node in most of the cases all be in the state of resources idle; Do not consider the service life and the resource optimization problem of the radio node that is not located on the different location, make the radio node that often needs to change fault or exhausted power supply, cause train travel information such as train speed limit information in time not assign; The existence time limit of network has received great restriction, has had a strong impact on the traffic safety of train.Therefore, need a kind of actv. topology control method to prolong the existence time limit of network.
Summary of the invention
The objective of the invention is to overcome the problem that above-mentioned prior art exists; A kind of topology control method that is used for the wireless sense network of railway traffic is provided; The method that the present invention adopts piecemeal to layout is divided into section one by one with whole railway zone, is divided into the region unit that radio node density differs in the section again; And, determine the optimal deployment spacing of radio node in the region unit according to the speed of radio node expenditure of energy in each region unit of prediction.Simultaneously; Radio node of the present invention adopts work and sleep by turns by using mechanism; Whenever spacing in the section is provided with a working node from L, and other radio node is in dormant state, therefore; The present invention realizes being used for the existence time limit that the wireless sense network of railway traffic can improve network effectively, ensures that train travel information such as train speed limit information is in time assigned and the traffic safety of train.
The object of the invention is realized through following technical proposals: a kind of topology control method that is used for the wireless sense network of railway traffic, specific as follows:
The railway area along the line that at first will transmit train travel information is divided into several sections, sets up an aggregation node at each section;
Radio node sum N and rail conditions according to needs in the concrete section are arranged further are divided into length again with this section and are 1 M region unit;
Consume the speed r of gross energy according to all radio nodes in each region unit
iWith the proportionate relationship that the distance of this region unit and aggregation node is inversely proportional to, the radio node that calculates the required layout of each region unit is counted n
i, and then calculate the spacing d of radio node spare in each region unit
i, d
i=1/n
i
According to spacing d
iRadio node is evenly arranged in the middle of each region unit, gives each radio node arranged in order ID number;
In section, whenever spacing is provided with a working node from L, and other radio node is in dormant state, and radio node is that unit carries out work/dormant state by turns with the region unit;
All radio nodes all communicate through aggregation node in the section and safe train operation control center in the section.
Said aggregation node has two kinds of communication patterns: a kind of for the short-distance wireless communication pattern, be used for and the radio node of this section communicates; Another kind of for long distance wireless communication or wire communication pattern, be used to be connected to external network.All communicate information to aggregation node with all radio nodes in the section, aggregation node is connected to external network and safe train operation control center carries out information interchange.
In order to optimize communicating by letter between all radio nodes in aggregation node and the section, said aggregation node is arranged on the point midway of section under it.
After the radio node configuration was accomplished, not all radio node was worked simultaneously, but is divided into work and dormancy two states, to prolong the no electrical nodes life-span.
During netinit; All radio nodes are all in running order, because in the repeating process of information, the distance between each is jumped is even more; The gross energy that radio node consumes is few more, therefore can calculate each according to this principle and jump the optimal distance L between the working node.Said in section, whenever spacing is provided with a working node from L, and other radio node is in dormant state, and its method is specially:
The radio node that is 1 for ID in the section number at first is made as working node, and whenever spacing later on is provided with next working node again from L, and other radio node between the working node then gets into dormant state.
When working node is set, after a selected working node, possibly not have radio node in place apart from this working node L place, this moment then this working node of selected distance apart near the radio node of L as next working node.
Said optimal distance L is for making (ad
α+ b) the minimum d value of gl/d result, wherein d is the distance between each jumping, and b is the energy that single wireless receiving signal is consumed, and α is the path fading coefficient, and a is the emissivity factor of radio node emitter.
Said radio node is that unit carries out work/dormant state mechanism of rotating that work/dormant state rotates and is with the region unit:
After setting working node and dormancy node, all radio node in-to-in time meters pick up counting simultaneously in the section;
The information that a last jumping working node biography was come in the section under working node was responsible for transmitting, the radio node of dormancy is then closed Receiver And Transmitter, waits the arrival of own work-hours;
Per interval T carries out rotating of one action node, and last round of working node will be chosen the working node of the interior next radio node of said region unit as a new round, and himself gets into dormant state.
Working node work behind a period of time T, will get into dormant state, but be not to get into dormancy at once; But can be in the dormancy state of leaving one's post that time span is t, t generally gets t=T/100 less than T; To carry out this moment working node by turns, be unit with the region unit by turns, be in ID number of the dormancy state of leaving one's post and send rotation information for the meeting of the working node of i; Prepare to select be for ID number the radio node of i+1 as next working node, if t in the time period i+1 radio node revive, then horse back can be received the rotation information of i radio node; And return confirmation and give the i radio node, the i radio node can get into dormant state behind the t end cycle, and the i+1 radio node becomes new working node; Send information near the radio node of just having revived simultaneously, inform that its radio node gets into dormant state again from dormancy; If t in the cycle i radio node can not receive the affirmation information that the i+1 radio node is revived and sent out, the i radio node still is a working node in the then next T cycle.
If continuous 3 T cycles of i radio node all revive under the situation of the affirmation sent out can not receive the i+1 node; Continuation is as working node; Think that then the i+1 radio node breaks down; The i radio node will keep in repair it through aggregation node train notified safe operation control center, and before the reparation of i+1 node, it is next working node that the i node will be chosen the i+2 node.
If will get into the boundary position that the i working node of dormant state is in affiliated section; Just the i working node is last working node on a wherein border of affiliated section; Then it will transmit its rotation information another border to section through other working node; If be in section the other end i ' number working node last round of also be working node, then the next T of i ' number working node and i working node gets into dormant state in the cycle.
The present invention is following with respect to the advantage and the beneficial effect of above-mentioned prior art:
(1) the present invention utilizes the method for wireless sense network; Safe train operation control centre can be with train travel information through aggregation node; Be delivered to the purpose operating point by multihop network; The train of process can both be read the information of this point; The issuing process of information leans on wireless sense network to accomplish entirely; Need not manual intervention, minimizing personnel under adverse circumstances are provided with the problem of various bulletins difficulties;
(2) can assign train travel information by fast speed, reduce various safety misadventures, improve the traffic safety of train;
(3) network itself can self-detection failure, occurs in case find radio node in bad order, can be in time to the reflection of safe train operation control center, the safety that improves network;
(4) radio node has been taked collocation method and work and sleep by turns by using mechanism flexibly, can save the expenditure of energy of radio node, effectively prolongs the network survivability time limit.
Description of drawings
Fig. 1 is the radio node arrangement plan of railway of the present invention wireless sense network along the line;
Fig. 2 transmits scheme drawing for radio node information of the present invention;
Fig. 3 is a radio node work and sleep by turns by using schematic diagram of mechanism.
The specific embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is done to specify further, but embodiment of the present invention is not limited thereto.
As shown in Figure 1, a kind of topology control method that is used for the wireless sense network of railway traffic,
The railway area along the line that at first will transmit train travel information is divided into several sections, sets up an aggregation node at each section point midway.
Said aggregation node has two kinds of communication patterns: a kind of for the short-distance wireless communication pattern, be used for and the radio node of this section communicates; Another kind of for long distance wireless communication or wire communication pattern, be used to be connected to external network.All radio nodes all communicate information to aggregation node in this section, and aggregation node is connected to external network and safe train operation control center carries out information interchange.
All radio nodes all communicate through aggregation node in the section and safe train operation control center in the section.
The collocation method of radio node is following:
Radio node sum N and rail conditions according to needs in the concrete section are arranged further are divided into length again with this section and are 1 M region unit; Be followed successively by 1,2 for each region unit ID number ..., m ..., M-1, M; With the aggregation node is the center; The density of radio node is along with its distance with aggregation node increases and reduces in the region unit, and the interior radio node of region unit is the equidistant centre that is evenly distributed on region unit of line style.This is that radio node is serving as the role that information is collected and transmitted because in the banded network along the railway, and the distribution of radio node is banded; Can find out that from the near more radio node of aggregation node, the number of times of forwarding information can be many more; The speed of expenditure of energy also can be than away from aggregation node fast, so, in order to prolong the life-span of whole network; The closer to the zone of aggregation node, the density of its radio node is also wanted corresponding increase.
Consume the proportionate relationship that the distance of speed ri and this region unit and the aggregation node of gross energies is inversely proportional to according to all radio nodes in each region unit, promptly far away more apart from aggregation node, the gross energy of consumption is few more; Near more apart from aggregation node, the gross energy of consumption is many more.Therefore for the expenditure of energy speed that makes each node is identical, all N radio node will be assigned to according to the proportionate relationship of above-mentioned expenditure of energy in each region unit, can calculate the radio node of the required layout of each region unit and count n
i, for example, suppose that section has been divided into 5 region units; The distance proportion of these five region units and middle aggregation node should be 3: 2: 1: 2: 3; Then the consumption ratio of energy should be 1: 2: 3: 2: 1, suppose always to have 1100 nodes, then; The node number that each region unit is got should be 100,200,300,200,100, calculates n
iAfter, and then calculate the spacing d between radio node in each region unit
i, d
i=1/n
i
After the radio node configuration was accomplished, not all radio node was worked simultaneously, but is divided into work and dormancy two states, to prolong the no electrical nodes life-span.So in section, whenever spacing is provided with a working node from L, other radio node is in dormant state, and radio node is that unit carries out work and sleep by turns by using with the region unit.
During netinit, all radio nodes are all in running order, because in the repeating process of information, the distance between each is jumped is even more, the gross energy that radio node consumes is just few more.
And, the signal forwarding between radio node the distance B of the gross energy e that will consume and wireless receiving and dispatching node exist below relation: e (D)=(aD
α+ b
1)+b
2, wherein, b
1, b
2For wireless receiving and dispatching node emission with receive the energy that message consumes.Find out a D value and make that whole network energy consumption E=e (D) * Length/D (Length is the total length of network) reached minimum when carrying out primary information transmitted; This D value also is that each jumps the distance L between the working node; Be that 1 radio node at first is made as working node with sequence number in the section then, whenever spacing later on is provided with a working node again from L.After the selected working node, possibly not have radio node in place apart from this working node L place, this moment then this working node of selected distance apart near the radio node of L as next working node.When there is information generating at certain working node place, this information can through its working node hop-by-hop that closes on be delivered to the aggregation node place, as shown in Figure 2.
Radio node is that the work and sleep by turns by using mechanism that unit carries out work and sleep by turns by using is with the region unit:
After setting working node and dormancy node, all radio node in-to-in time meters pick up counting simultaneously in the section;
The information that a last jumping working node biography was come in the section under working node was responsible for transmitting, the radio node of dormancy is then closed Receiver And Transmitter, waits the arrival of own work-hours;
Per interval T carries out rotating of one action node, and last round of working node will be chosen the working node of the interior next radio node of said region unit as a new round, and himself gets into dormant state.
As shown in Figure 3, working node work behind a period of time T, will get into dormant state; But be not to get into dormancy, but can be in the dormancy state of leaving one's post that time span is t, t is less than T at once; Generally getting t=T/100, will carry out rotating of working node this moment, is unit with the region unit by turns; Be in ID number of the dormancy state of leaving one's post and send rotation information for the meeting of the working node of i, prepare to select be for ID number the radio node of i+1 as next working node, if t in the time period i+1 radio node revive; Then can receive the rotation information of i radio node at once; And return confirmation and give the i radio node, the i radio node can get into dormant state behind the t end cycle, and the i+1 radio node becomes new working node; Send information near the radio node of just having revived simultaneously, inform that its radio node gets into dormant state again from dormancy; If t in the cycle i radio node can not receive the affirmation information that the i+1 radio node is revived and sent out, the i radio node still is a working node in the then next T cycle.
If continuous 3 T cycles of i radio node all revive under the situation of the affirmation sent out can not receive the i+1 node; Continuation is as working node; Think that then the i+1 radio node breaks down; The i radio node will keep in repair it through aggregation node train notified safe operation control center, and before the reparation of i+1 node, it is next working node that the i node will be chosen the i+2 node.
If will get into the boundary position that the i working node of dormant state is in affiliated section; Just the i working node is last working node on a wherein border of affiliated section; Then it will transmit its rotation information another border to section through other working node; If be in section the other end i ' number working node last round of also be working node, then the next T of i ' number working node and i working node gets into dormant state in the cycle.
The foregoing description is a preferred implementation of the present invention; But embodiment of the present invention is not restricted to the described embodiments; Other any do not deviate from change, the modification done under spirit of the present invention and the principle, substitutes, combination, simplify; All should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (10)
1. a topology control method that is used for the wireless sense network of railway traffic is characterized in that, and is specific as follows:
The railway area along the line that at first will transmit train travel information is divided into several sections, sets up an aggregation node at each section;
Radio node sum N and rail conditions according to needs in the concrete section are arranged further are divided into M the region unit that length is l again with this section;
Consume the speed r of gross energy according to all radio nodes in each region unit
iWith the proportionate relationship that the distance of this region unit and aggregation node is inversely proportional to, the radio node that calculates the required layout of each region unit is counted n
i, and then calculate the spacing d of radio node spare in each region unit
i, d
i=1/n
i
According to spacing d
iRadio node is evenly arranged in the middle of each region unit, gives each radio node arranged in order ID number;
In section, whenever spacing is provided with a working node from L, and other radio node is in dormant state, and radio node is that unit carries out work/dormant state by turns with the region unit;
All radio nodes all communicate through aggregation node in the section and safe train operation control center in the section.
2. a kind of topology control method that is used for the wireless sense network of railway traffic according to claim 1; It is characterized in that: said aggregation node has two kinds of communication patterns: a kind of for the short-distance wireless communication pattern, be used for and the radio node of this section communicates; Another kind of for long distance wireless communication or wire communication pattern, be used to be connected to external network; All communicate information to aggregation node with all radio nodes in the section, aggregation node is connected to external network and safe train operation control center carries out information interchange.
3. a kind of topology control method that is used for the wireless sense network of railway traffic according to claim 1 is characterized in that: said aggregation node is arranged on the point midway of its affiliated section.
4. a kind of topology control method that is used for the wireless sense network of railway traffic according to claim 1; It is characterized in that: said in section, whenever spacing is provided with a working node from L; Other radio node is in dormant state; Its method is specially: the radio node that is 1 for ID in the section number at first is made as working node, and whenever spacing later on is provided with next working node again from L, and other radio node between the working node then gets into dormant state; After a selected working node, possibly not have radio node in place apart from this working node L place, this moment then this working node of selected distance apart near the radio node of L as next working node.
5. a kind of topology control method that is used for the wireless sense network of railway traffic according to claim 1 is characterized in that: said distance L is for making (ad
α+ b) the minimum d value of gl/d result, wherein d is the distance between each jumping, and b is the energy that single wireless receiving signal is consumed, and α is the path fading coefficient, and a is the emissivity factor of radio node emitter.
6. a kind of topology control method that is used for the wireless sense network of railway traffic according to claim 1 is characterized in that: said radio node is that unit carries out work/dormant state mechanism of rotating that work/dormant state rotates and is with the region unit:
After setting working node and dormancy node, all radio node in-to-in time meters pick up counting simultaneously in the section;
The information that a last jumping working node biography was come in the section under working node was responsible for transmitting, the radio node of dormancy is then closed Receiver And Transmitter, waits the arrival of own work-hours;
Per interval T carries out rotating of one action node, and last round of working node will be chosen the working node of the interior next radio node of said region unit as a new round, and himself gets into dormant state.
7. a kind of topology control method that is used for the wireless sense network of railway traffic according to claim 6 is characterized in that: working node work behind a period of time T, will get into dormant state; But be not to get into dormancy, but can be in the dormancy state of leaving one's post that time span is t, t is less than T at once; To carry out this moment working node by turns, be unit with the region unit by turns, be in ID number of the dormancy state of leaving one's post and send rotation information for the meeting of the working node of i; Prepare to select is for ID number that the radio node of i+1 is as next working node; If t in the time period i+1 radio node revive, then at once can receive the rotation information of i radio node, and return confirmation and give the i radio node; The i radio node can get into dormant state behind the t end cycle; The i+1 radio node becomes new working node, sends information near the radio node of just having revived from dormancy simultaneously, informs that its radio node gets into dormant state again; If t in the cycle i radio node can not receive the affirmation information that the i+1 radio node is revived and sent out, the i radio node still is a working node in the then next T cycle.
8. a kind of topology control method that is used for the wireless sense network of railway traffic according to claim 7; It is characterized in that: if continuous 3 T cycles of i radio node all revive under the situation of the affirmation sent out can not receive the i+1 node; Continuation is as working node; Think that then the i+1 radio node breaks down; The i radio node will keep in repair it through aggregation node train notified safe operation control center, and before the reparation of i+1 node, it is next working node that the i node will be chosen the i+2 node.
9. according to claim 7 or 8 described a kind of topology control methods that are used for the wireless sense network of railway traffic; It is characterized in that: if will get into the boundary position that the i working node of dormant state is in affiliated section; Just the i working node is last working node on a wherein border of affiliated section; Then it will transmit its rotation information another border to section through other working node; If be in section the other end i ' number working node last round of also be working node, then the next T of i ' number working node and i working node gets into dormant state in the cycle.
10. a kind of topology control method that is used for the wireless sense network of railway traffic according to claim 7 is characterized in that: said t specifically gets t=T/100 less than T.
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| CN102638788A (en) * | 2011-02-12 | 2012-08-15 | 苏州达联信息科技有限公司 | Business modifying method and device for railway track monitoring and sensing network |
| CN102638812A (en) * | 2011-02-12 | 2012-08-15 | 苏州达联信息科技有限公司 | Business registration method and device for railway track monitoring and sensing network |
| CN102638828A (en) * | 2011-02-12 | 2012-08-15 | 苏州达联信息科技有限公司 | Remote debugging method and device for railway track monitoring and sensing network |
| CN102413163B (en) * | 2011-08-08 | 2014-12-31 | 上海通号轨道交通工程技术研究中心有限公司 | Method and device for collecting ground wireless sensor data by high-speed rail motor cars |
| JP5806068B2 (en) * | 2011-09-30 | 2015-11-10 | 日本信号株式会社 | Train control system |
| CN105599786B (en) * | 2015-12-18 | 2017-08-11 | 中铁武汉电气化局集团有限公司 | A kind of railroad interlocking system Collaborative Control device |
| CN105704778B (en) * | 2016-01-11 | 2018-04-17 | 东北电力大学 | A kind of mobile peer-to-peer network aggregation domain classification method with topology ambiguity |
| CN105744587B (en) * | 2016-01-27 | 2019-05-17 | 中国铁道科学研究院电子计算技术研究所 | A kind of data transmission method and device for Wireless Sensor Networks |
| CN105898696B (en) * | 2016-04-11 | 2019-08-27 | 广东工业大学 | Roadside node positioning method based on section credible evaluation |
| CN108174464A (en) * | 2017-12-26 | 2018-06-15 | 江西师范大学 | A kind of forest ecological environment wireless sensor network monitoring system |
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