CN104159288A - Self-healing method of WSN (Wireless Sensor Network) node based on dynamic dormancy - Google Patents
Self-healing method of WSN (Wireless Sensor Network) node based on dynamic dormancy Download PDFInfo
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- CN104159288A CN104159288A CN201410444410.5A CN201410444410A CN104159288A CN 104159288 A CN104159288 A CN 104159288A CN 201410444410 A CN201410444410 A CN 201410444410A CN 104159288 A CN104159288 A CN 104159288A
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Abstract
The invention provides a self-healing method of a WSN (Wireless Sensor Network) node based on dynamic dormancy. By adopting the method, after a node system clock has deviation to cause desynchronization to be unable to upload data, the WSN node actively modifies the self-dormancy period, actively matches and searches a network synchronization signal, so that a lost node returns a network. The method cannot influence the other node in deep dormancy, and only some personal energy is consumed to implement self-healing and resynchronization. According to the method, the problem of difficulty in recalling after the node is lost in the existing WSN application is greatly reduced, and stability of the WSN is improved.
Description
Technical field
The present invention relates to a kind of method, especially a kind of WSN Site autonomy curing method based on dynamic dormancy, belongs to the technical field of wireless sensor network.
Background technology
Wireless sensor network (WSN) is the end that Internet of Things is realized data acquisition, to have merged sensor technology, the condensation products of the information processing technology and the network communications technology, its appearance has completed the communication of man and nature, expanded the human cognitive world, the ability in the perception world.Utilize perception, calculating and the transmittability of WSN, can realize the multiple target Real-Time Monitoring to wide scope, and by the real-time aggregate transmission of status data, thereby realize environmental monitoring, control the functions such as warning, this has important Research Significance and huge practical value in many fields such as industrial or agricultural monitoring, intelligent transportation, Smart Home, deathtrap remote detection, is considered to one of technology by 21st century is had an immense impact on.
Yet sensor node has integrated design thought, its embedded processing is limited in one's ability, and transmitting-receiving ability is restricted.Meanwhile, for realizing the low power dissipation design of sensing network, the synchronous dormant and awakening mechanism of network requires very high to the time synchronized of the whole network.In addition, due to node deployment circumstance complication, the poor stability of wireless communication, packet loss is relatively high, the loss of data after easily causing node loss synchronous.
At present, by optimize communicate mechanism, routing algorithm, synchronization policy, thus dormancy strategy avoids network blockage or crowded realization to reduce network packet loss rate, and the research that improves stability aspect is a lot.Yet the simple solution of seeking is theoretically subject to the drawbacks limit of WSN own, the defect of wireless network self stability has caused WSN to have the certainty of node loss problem.In node loss, in situation that cannot be synchronous, realize the networking again of node, be synchronously urgent problem in actual application again.
Traditional wireless sensor network, as Zigbee network, after node loss, can, by selecting standby or other routing nodes as relaying, realize network self-healing.Yet, in the practical application of wild environment, for reducing network power consumption, often can not adopt the network architecture with proprietary routing node, but adopt multi-hop relay Mesh framework, node has routing function concurrently, the whole network synchronisation of nodes dormancy-synchronized wake-up, reduces energy consumption to greatest extent.This network requires higher for synchronization accuracy, once and node loss, sync fail, the routing node of always not working is mutual with it, is difficult to realize the networking again of node, synchronous again.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of WSN Site autonomy curing method based on dynamic dormancy is provided, after it can realize wireless sensor network node loss, initiatively networking is synchronous again, has improved stability and the reliability of radio sensing network.
According to technical scheme provided by the invention, the described WSN Site autonomy curing method based on dynamic dormancy, node in wireless sensor network is judged to be to be lost after node, described loss node is revised total cycle of work and the operating time of waking up of self, to adjust described loss node, enter time and the next time of waking operating state up of resting state next time, accelerate operating frequency, the increase work duty ratio of described loss node;
Lose node and waking duration of work up, the synchronizing signal that the synchronizing signal that other nodes are replied in receiving wireless sensor network or broadcast forward, lose node according to the time modification in above-mentioned synchronizing signal self clock, so that work total cycle, sleeping/waking operating frequency and the wireless sensor network of described loss node after modification self clock is consistent, realization loss node networks, synchronizes with wireless sensor network.
Further, the method that node is lost in the judgement of node in wireless sensor network is, whether receives that synchronizing signal carries out synchronously within the work that wakes up the later stage of described node, wakes duration of work up 3 times not synchronous, decision node loss if continuous.
Further, accelerating the operating frequency of loss node and increasing after work duty ratio, if it is synchronous that described loss node is not realized within continuous 15 total cycles of work, stop losing the synchronization request operation of node, and total cycle of work, the duty ratio of recovering to lose node.
Further, the time that enters resting state described next time is
T
1＝T
2-T
3modT
z
Enter next time and wake the operating time up and be
T
4＝T
z-T
3modT
z
Wherein, T
1for entering the time of resting state, T next time
2for waking up the operating time, T
3for current time, T
zfor working total cycle, T
4for entering next time, wake up the operating time.
Advantage of the present invention: whether node by self whether receiving synchronizing signal decision node is lost, has avoided data packet loss and be mistaken as the problem of node loss once in a while; After node loss, by the modification of self sleep frequency, dormancy duty ratio being reached to node, network again, synchronous effect again, implementation belongs to the healing certainly of node, does not need route father node to make an amendment, the link to whole network, the impact of energy consumption is very little; The present invention can realize the synchronous dormancy of wireless sensor network-synchronized wake-up mechanism lower node synchronization loss and the problem of permanent failure, can be the in the situation that of node loss fast realization network again, synchronous again, improved the stability of WSN system.
Accompanying drawing explanation
Fig. 1 is principle schematic of the present invention.
Fig. 2 is schematic flow sheet of the present invention.
Embodiment
Below in conjunction with concrete drawings and Examples, the invention will be further described.
As shown in Figure 1: after realizing wireless sensor network node loss, initiatively networking is synchronous again, has improved stability and the reliability of radio sensing network, and WSN Site autonomy curing method of the present invention is:
Node in wireless sensor network is judged to be to be lost after node, described loss node is revised total cycle of work and the operating time of waking up of self, to adjust described loss node, enter time and the next time of waking operating state up of resting state next time, accelerate operating frequency, the increase work duty ratio of described loss node;
Lose node and waking duration of work up, the synchronizing signal that the synchronizing signal that other nodes are replied in receiving wireless sensor network or broadcast forward, lose node according to the time modification in above-mentioned synchronizing signal self clock, so that work total cycle, sleeping/waking operating frequency and the wireless sensor network of described loss node after modification self clock is consistent, realization loss node networks, synchronizes with wireless sensor network.
Particularly, WSN Site autonomy curing method is for the loss node in WSN, and making to lose node cannot start recovery process after uploading data.Total cycle of work of wireless sensor network node refers to that node wakes the operating time up from one and wakes operating time interval up to the next one, and two adjacent waking up between the operating time of node are the dormancy time of node.When node is in waking up in the operating time, can uploading data and and other nodes between carry out time synchronized operation.
For fear of data once in a while packet loss be mistaken as the problem of node loss, the method that node decision node in wireless sensor network of the present invention is lost is, waking duration of work up and whether receive that synchronizing signal carries out synchronously at described node, if continuous, wake duration of work up 3 times not synchronous, decision node is for losing node.
After the node loss of judgement in wireless sensor network, lose node and keep not losing with interior other of wireless sensor network total cycle of work that node is identical, dormancy, wake operating frequency up.When loss node is normally worked, the time that enters resting state next time is
T
1＝T
2-T
3modT
z
Enter next time and wake the operating time up and be
T
4＝T
z-T
3modT
z
Wherein, T
1for entering the time of resting state, T next time
2for waking up the operating time, T
3for current time, T
zfor working total cycle, T
4for entering next time, wake up the operating time.In the embodiment of the present invention, current time T
3for the timer by losing in node obtains, mod is complementation.
Because described loss node is when initially entering operating state, other nodes, all in resting state, do not have network interaction, cannot receive the synchronizing signal of remote gateways; Now, can accelerate to lose the operating frequency and work duty ratio of node, allow loss node wake more continually to find network up; Once lose node in the synchronizing signal of waking synchronizing signal that duration of work receives that in wireless sensor network, other nodes are replied or broadcast up and forwarding, losing node can be according to the time modification in synchronizing signal self clock, realize network again, synchronous again; Realize and to lose node after synchronous and recover original cycle normal hibernation/wake up.
In the embodiment of the present invention, according to entering time of resting state and next time above-mentioned next time and entering, wake up the operating time, can accelerate to lose the operating frequency of node and increase the work duty ratio of losing node.Work duty ratio refers to the ratio that wakes operating time and total cycle of work up, and work duty ratio is corresponding with dormancy duty ratio, according to work duty ratio, can access dormancy duty ratio.In addition according to operating time and total cycle of working, can access, the time of dormancy.According to operating frequency, can determine the sleep frequency of losing node.
In the embodiment of the present invention, lose the size of the operating frequency after node is accelerated and the duty ratio of working and can select according to actual needs, lose node after accelerating operating frequency and work duty ratio, the energy of consumption increases; In the specific implementation, as long as make to revise, enter the work of resting state and wake up after the operating time next time, can make the operating time of losing node coincide with the operating time of other nodes as much as possible, receive as much as possible the synchronizing signal of other nodes, thereby realize fast, lose the synchronous of nodes domains wireless sensor network, specifically repeat no more.
As shown in Figure 2, the node in wireless sensor network enters before resting state in the operating state in each total cycle of working, and by correlating markings position in SyncCheck interface interchange Synchronization Component, judges in the cycle, whether to receive synchronizing signal; If the synchronizing signal of receiving, and not total cycle of modification and operating time, synchronization times N=0 not, revises parameter cycle K=0 continuously, carries out and finishes, and waits for that entering next cycle continues to carry out judgement; If the synchronizing signal of receiving, and revised total cycle of work and operating time, the design parameter of total cycle of the work of revising in node and operating time is recovered to initial value, N=K=0, carries out and finishes, and waits for that entering next cycle continues to carry out judgement; If the synchronizing signal of not receiving, N=N+1.
If N >=3, and not total cycle of modification and operating time, revise described total cycle of work and operating time, making total cycle of node work is 1min, and the operating time is 30s, continues cycle K=K+1 after revising parameter; If N >=3, and work total cycle and operating time revise, continue cycle K=K+1 after revising parameter; If N<3, carries out and finish, wait for that entering next cycle continues to carry out judgement.In the embodiment of the present invention, total periodic packets of working contains the dormancy time of node and wakes up between man-hour, when total cycle of work, is 1min, and the operating time, while being 30s, the work duty ratio of node was 50%; Total cycle of described work and operating time can be carried out corresponding selection setting according to the wireless sensor network under varying environment, repeat no more herein.
If K >=15, will recover initial value described total cycle of work and the operating time of modification, N=K=0, carries out and finishes, and enters next cycle continuation and carries out judgement; If K<15, carries out and finish, enter next cycle continuation and carry out judgement.
In above-mentioned workflow, accelerating to lose after the operating frequency and work duty ratio of node, within amended 15 total cycles of work, if losing node does not still realize synchronous, stop certainly curing synchronous behavior for what lose node, wait for next time and carry out, avoid consuming too much node energy.
Principle and the implementation method of the WSN Site autonomy curing method based on dynamic dormancy have more than been described, in order to realize the problem of the wireless sensor network node sync fail of synchronous dormancy-synchronized wake-up, have realized the healing certainly of node.
Whether node of the present invention by self whether receiving synchronizing signal decision node lose, and avoided data packet loss and be mistaken as the problem of node loss once in a while; After node loss, by the modification of self sleep frequency, dormancy duty ratio being reached to node, network again, synchronous effect again, implementation belongs to the healing certainly of node, does not need route father node to make an amendment, the link to whole network, the impact of energy consumption is very little; The present invention can realize the synchronous dormancy of wireless sensor network-synchronized wake-up mechanism lower node synchronization loss and the problem of permanent failure, can be the in the situation that of node loss fast realization network again, synchronous again, improved the stability of WSN system.
Claims (4)
1. the WSN Site autonomy curing method based on dynamic dormancy, it is characterized in that, node in wireless sensor network is judged to be to be lost after node, described loss node is revised total cycle of work and the operating time of waking up of self, to adjust described loss node, enter time and the next time of waking operating state up of resting state next time, accelerate operating frequency, the increase work duty ratio of described loss node;
Lose node and waking duration of work up, the synchronizing signal that the synchronizing signal that other nodes are replied in receiving wireless sensor network or broadcast forward, lose node according to the time modification in above-mentioned synchronizing signal self clock, so that work total cycle, sleeping/waking operating frequency and the wireless sensor network of described loss node after modification self clock is consistent, realization loss node networks, synchronizes with wireless sensor network.
2. the WSN Site autonomy curing method based on dynamic dormancy according to claim 1, it is characterized in that: the method that node is lost in the node judgement in wireless sensor network is, within the work that wakes up the later stage of described node, whether receive that synchronizing signal carries out synchronously, if continuous, wake duration of work up 3 times not synchronous, decision node is lost.
3. the WSN Site autonomy curing method based on dynamic dormancy according to claim 1, it is characterized in that: accelerating the operating frequency of loss node and increasing after work duty ratio, if it is synchronous that described loss node is not realized within continuous 15 total cycles of work, stop losing the synchronization request operation of node, and total cycle of work, the duty ratio of recovering to lose node.
4. the WSN Site autonomy curing method based on dynamic dormancy according to claim 1, is characterized in that: the time that enters resting state described next time is
T
1＝T
2-T
3modT
z
Enter next time and wake the operating time up and be
T
4＝T
z-T
3modT
z
Wherein, T
1for entering the time of resting state, T next time
2for waking up the operating time, T
3for current time, T
zfor working total cycle, T
4for entering next time, wake up the operating time.
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Cited By (1)
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| CN107197034A (en) * | 2017-06-21 | 2017-09-22 | 深圳市盛路物联通讯技术有限公司 | A kind of edge routing node and its report frequency adjusting method |
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