CN102547938B - Router, wireless sensor network and method for monitoring terminal nodes - Google Patents
Router, wireless sensor network and method for monitoring terminal nodes Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Abstract
The invention relates to the field of wireless sensor networks, in particular to a router, a wireless sensor network and a method for monitoring terminal nodes. The router is applied in the wireless sensor network, and comprises a routing module, an awakening module and a nonvolatile memory; the awakening module is connected with the routing module, and is used for periodically awakening the routing module which is in an asleep state; and the nonvolatile memory is connected with the routing module, and is used for storing the networking topologic information of the wireless sensor network in which the router is positioned and the information of the superior and subordinate nodes of the router, and the information is called after the routing module is awakened.
Description
Technical field
The present invention relates to radio sensing network field, particularly relate to a kind of method of router, radio sensing network and monitor terminal node.
Background technology
Along with the development of wireless communication technology and sensing technology, the application scenario of radio sensing network is more and more general.ZigBee is a kind of communication protocol be mainly used in radio sensing network, can be operated in 2.4GHz (Global prevalence), 868MHz (Europe is popular) and 915 MHz (U.S. is popular), 3 frequency ranges, there is the transmission rate of the highest 250kbit/s, 20kbit/s and 40kbit/s respectively, its transmission range in the scope of 10-75m, but can continue to increase.
As a kind of wireless communication technology, the main feature based on the radio sensing network of Zigbee protocol is low-power consumption and low cost.In power consumption, because the transmission rate of Zigbee protocol is low, transmitting power is only 1mW, and have employed park mode, and therefore power consumption is very low.It is estimated, the terminal equipment based on the radio sensing network of Zigbee protocol only just can maintain by two joints No. 5 batteries the service time reaching 6 months to about 2 years, and this is that other wireless device is too far behind to catch up.In cost, the initial cost of ZigBee module, at about 6 dollars, estimate drop to 1.5 to 2.5 dollars soon, and Zigbee protocol exempts from patent fee.Low cost is also a crucial factor for the radio sensing network based on Zigbee protocol.
Above-mentioned about in the description of Zigbee protocol, most critical be exactly " low-power consumption ", this characteristic also have impact on the node cost of the radio sensing network based on Zigbee protocol to a great extent, therefore can say that the characteristic of Zigbee protocol technology most critical is exactly low energy consumption.But when actual this technology of employing carries out networking, when only simplifying functional node/global function node (RFD/FFD) as terminal leaf node, the low energy consumption degree that average transmit power is 1mW can be reached, and as router (Router) or telegon (Coordinator), average power consumption in use will reach about 200 ~ 500mW.And above-mentioned average power consumption is only also the power consumption of Zigbee protocol chip itself, also will add the power consumption of peripheral circuit, its total power consumption also will increase further.Actual measurement shows, the ZigBee router node adopting common disposable lithium cell to power can only continuous firing 2 ~ 3 days.
The scheme solving power problems in prior art mainly comprises: adopt wired power supply; The Micropelt company of TI company and Germany releases the Zigbee protocol node of new forms of energy jointly, and this node adopts the thermoelectric generator of Micropelt company to provide power supply to the router of the Zigbee protocol of TI company; Solar storage battery is adopted to power to the radio sensing network based on Zigbee protocol; Extrahigh energy special cells is adopted to power to the radio sensing network based on Zigbee protocol.
Adopt the shortcoming of wired power supply to be to make the radio sensing network based on Zigbee protocol become cable network, so just cannot embody the flexible advantage of radio sensing network.Based on the spacing of the node of the radio sensing network of Zigbee protocol generally at several meters ~ tens meters, if all-router and telegon all will adopt wired power supply, so the power line of Miru's cobweb will make the radio sensing network based on Zigbee protocol become disgusting product, is difficult to be easily accepted by a user.
The Zigbee protocol node that TI company and German Micropelt company release new forms of energy jointly adopts the thermoelectric generator of Micropelt company to provide power supply to the Zigbee protocol router of TI company, the shortcoming of this skill solution is that novel thermoelectric generator is expensive, will write off completely based on the radio sensing network of Zigbee protocol advantage with low cost.In addition, thermoelectric generator is only applicable to the more violent environment that colds and heat succeed each other, and most application scenario cannot use thermoelectric generator.
The shortcoming of the technical scheme adopting solar storage battery to power to the radio sensing network based on Zigbee protocol is, the price of solar panel and storage battery is considerably beyond the price of the radio sensing network node based on Zigbee protocol, and a lot of application scenario cannot ensure enough solar light irradiations.
And the shortcoming adopting extrahigh energy special cells to power to the radio sensing network based on Zigbee protocol is that extrahigh energy special cells price is very expensive, the occasion only having only a few to disregard cost can use this solution.
Therefore, it is possible to provide the technical scheme that a kind of solution of cheapness is powered based on the radio sensing network of Zigbee protocol, and not destroying the flexible advantage of radio sensing network, is problem demanding prompt solution in prior art.
Summary of the invention
Technical problem to be solved by this invention is, provides the technical scheme that a kind of solution of cheapness is powered based on the radio sensing network of Zigbee protocol, and does not destroy the flexible advantage of radio sensing network.
In order to solve the problem, the invention provides a kind of router, be applied in radio sensing network, comprise a routing module, a wake module and a nonvolatile memory; Described wake module is connected to routing module, for periodically waking the routing module being in resting state up; Described nonvolatile memory is connected with routing module, and for the networking topology information of the radio sensing network residing for storage router, the higher level of this router and downstream site information, above-mentioned information is called after being woken for routing module.
As optional technical scheme, comprise a timer further, described timer is connected with wake module, periodically wakes routing module up for controlling wake module.
As optional technical scheme, described timer is connected with routing module further, for receiving the clock alignment signal in the radio sensing network that comes from residing for router.
As optional technical scheme, comprise a network reconfiguration control module further, described network reconfiguration control module is connected with wake module and routing module, for when the number of times that wake module initiates wake command reaches a preset value, send a network reconfiguration order to routing module, initiating primary network paging, to detect in self higher level and downstream site whether there is failure node, and regenerating network topology when there is failure node.
Invention further provides a kind of radio sensing network, comprise at least one terminal, at least one router and at least one telegon, in described router, at least comprise an above-mentioned router.
As optional technical scheme, comprise set of router further, each in described set of router is above-mentioned router, each in described set of router includes a timer, periodically wake routing module up for controlling wake module, and all set timers in described set of router there are identical wake-up period and wakeup time point.
As optional technical scheme, comprise second group of router further, each in described second group of router is above-mentioned router, each in described second group of router includes a timer, periodically routing module is waken up for controlling wake module, all set timers in described second group of router have identical wake-up period and wakeup time point, and the wake-up period of the timer in described set of router and the timer in second group of router is different.
Invention further provides a kind of method adopting the monitor terminal node of above-mentioned router, comprise the steps: that the routing module of (a) router is waken up data bits; B () routing module transfers the networking topology information of residing radio sensing network, the higher level of this router and downstream site information from nonvolatile memory; C () routing module detects the end node locations information in router coverage, and accept the reporting information of downstream site; D () routing module, according to the information transferred from nonvolatile memory, is reported the reporting information of above-mentioned end node locations information and downstream site to superior node; E () routing module reenters resting state.
As optional technical scheme, in described step (a), described wake module, by a Timer Controlling, periodically wakes routing module up.Before step (e), comprise described routing module further and require a clock calibrating signal to the radio sensing network at router place, and calibrate the step of timer.
As optional technical scheme, before step (e), comprise radio sensing network request one wakeup time of described routing module to router place further, and be stored to the step of wake module, in described step (a), wake module wakes routing module up according to this wakeup time.
As optional technical scheme, described router comprises a network reconfiguration control module further, described network reconfiguration control module is connected with wake module and routing module, described method is between step (b) and (c), comprise the steps: that ICQ is initiated in the network reconfiguration order that (f1) routing module sends according to the network reconfiguration control module received further, detect in the higher level of this router self and downstream site and whether there is failure node, if there is failure node, then perform step (f2), otherwise perform step (c); (f2) network topology is regenerated.
As optional technical scheme, comprise the steps: between described step (a) and (b) that (g1) routing module enters the first quiet period after being waken up data bits immediately further, in described first quiet period, routing module only accepts data and does not send data, after the first quiet period terminates, continue to perform step (b).
As optional technical scheme, comprise the steps: between described step (d) and (e) that first (g2) routing module enters the second quiet period before dormancy further, in described second quiet period, routing module only accepts data and does not send data, after the second quiet period terminates, continue to perform step (e).
The invention has the advantages that, have employed and the router of periodically dormancy can form wireless sense network network, wake module is adopted to wake routing module up, and adopt nonvolatile memory to preserve network topological information, make router can carry out energy efficient by dormancy, and can devote oneself to work rapidly after being waken up.Due in the dormant state mainly wake module and nonvolatile memory better, therefore provide significant conservation the power consumption of router, add life cycle.
Be waken up at synchronization further by same group of router in net control, and in synchronization dormancy, just make entirely to organize router and be operated in orderly synchronous regime, avoid loss of data.
Be not waken up in the same time further by the difference group router in net control, avoiding the power down simultaneously of the whole network router, avoid loss of data.
Arranging after router is waken up and before dormancy further and only accept and do not send " the silence period edge " of data, there is loss of data due to router step different from each other in the moment after can avoiding the startup caused because of reasons such as clock jitter, course of action are slower due to indivedual router node or before dormancy.
Accompanying drawing explanation
It is the network architecture diagram of radio sensing network described in radio sensing network of the present invention and router embodiment shown in accompanying drawing 1.
Accompanying drawing 2 is cut-away views of the first router shown in accompanying drawing 1.
It is the implementation step schematic diagram of the method embodiment of monitor terminal node of the present invention shown in accompanying drawing 3.
Embodiment
Elaborate below in conjunction with the embodiment of accompanying drawing to the method for router provided by the invention, radio sensing network and monitor terminal node.
First provide the embodiment of radio sensing network of the present invention, in this embodiment, include router of the present invention simultaneously.
Be the network architecture diagram of radio sensing network described in this embodiment shown in accompanying drawing 1, comprise the first router 11, the second router 12, telegon 10 and multiple terminal 19.In other implementations, can further include more router, and router also can be arranged step by step, the information of lower level router reports supreme level router, finally gathers to telegon.The router number of wireless sense network is at least one.The region that the wireless signal of the all-routers such as the first router 11 and the second router 12 covers is the guarded region of radio sensing network, and terminal 19 is sensor node, and the number of terminal 19 is at least one.All terminals 19 all with cover the router communication of self zone, the information collected is reported to this router, and finally reports to telegon 10.The data message transmitted in network has numbering, such as, can distinguish each message with " 16bit node address+16bit message cycle numbering ", add 32bit timestamp.On the basis of the above simple content additions and deletions are done to message structure, the apparent distortion of technology disclosed by the present invention must be considered as.And error retransmission mechanism can be added to ensure that whole network data message can not be lost or make mistakes.
Accompanying drawing 2 is cut-away views of the first router 11 shown in accompanying drawing 1, comprises routing module 211, wake module 212, nonvolatile memory 213, timer 2 14 and network reconfiguration control module 215.Wherein timer 2 14 and network reconfiguration control module 215 are optional components.A battery (not shown) also should be had for above all module for power supply in described the first router 11.Described wake module 212 is connected with routing module 211, and described timer 2 14 is connected with wake module 212, and timer 2 14 is connected with routing module 211 further; Described nonvolatile memory 213 is connected with routing module 211; Described network reconfiguration control module 215 is connected with wake module 212 and routing module 211.
The structure of the second router 12 is identical with the first router 11, repeats no more herein.
Routing module 211 described in present embodiment is the modules of all functions possessing ordinary router node in prior art, comprise the wireless messages adopting Zigbee protocol receiving terminal node or subordinate's router node, and the information received is sent to higher level's router node or telegon, and the function such as participation network topology rebuilding when other router node breaks down in a network.In this embodiment, routing module 211 is in resting state in portion of time.In the dormant state, routing module 211 does not perform the functions such as any communication and network reconnection, and just retains a thread communicated with wake module 212.Therefore in the dormant state, the power consumption of routing module 211 is extremely low.
Described wake module 212 is connected to routing module 211, for periodically waking the routing module 211 being in resting state up.The initiation of this wake command can be before each dormancy of routing module, obtain a wakeup time from radio sensing network and be stored in wake module 212, also can be that the timer 2 14 by being connected with wake module 212 is initiated.Described timer 2 14 is connected with wake module 212, periodically wakes routing module 211 up for controlling wake module 212.The wake-up period of this timer 2 14 can be pre-set by user, also can be to be connected with routing module 211 further by timer 2 14, and is obtained from radio sensing network.Timer 2 14 is connected the clock alignment signal in the radio sensing network that can also be used for receiving and come from residing for router one 1 with routing module 211.
For clock alignment signal, if include the ZigBee chip possessing real-time clock waking-up function in routing module 211, this chip is using telegon clock as standard clock source.Then issue clock when network is set up to each router node and terminal leaf node, and recalibrate after one period of long period; For the ZigBee chip not possessing real-time clock waking-up function, then can when each routing module 211 proceed to operating state by dormancy, or every carrying out clock alignment several times.
In engineering practice, for the radio sensing network based on Zigbee protocol, the ZigBee chip that router node uses and the ZigBee chip that terminal leaf node uses are identical, all there is SLP(SLeeP, some producers chip pin name is different, but function is identical) pin.The hardware circuit of routers can make simple change, enter dormancy by GPIO pin Controlling vertex able to programme or exit dormancy, and controlling dormancy/operating time ratio (being duty ratio again) by software programming.As can be seen from describing above, the technical scheme of adding wake module 212 is very little to the change of existing router on hardware and software, is therefore easy to operation.
In this embodiment, the first router 11 belongs to set of router, and set of router can also comprise multiple router identical with the first router 11 further.Set of router each include a timer, periodically wake routing module up for controlling wake module, and all set timers in described set of router have identical wake-up period and wakeup time point.The second router 12 belongs to second group of router, and the feature of second group of router is identical with first group, repeats no more.All set timers with group router have identical wake-up period and wakeup time point, can ensure that all routers are opened at synchronization and enter operating state, and enter dormancy at synchronization, so just make entirely to organize equipment and be operated in orderly synchronous regime, avoid loss of data.
In this embodiment, the set timer in the set of router at the first router 11 place and second group of router at the second router 12 place has different wake-up periods.Certainly, in other embodiment, the configuration of more groups also can be comprised further.Can ensure so different group router can at different time loss complete all electric energy.Often open 100ms, dormancy 9900ms for such as first group; Often open 100ms for second group, dormancy 99900ms; Often open 100ms, dormancy 999900ms for 3rd group.So, staff is when changing battery to set of router, and the router of other groups still can normally work, and whole network is only that accuracy declines to some extent, and whole network can not occur changes battery and the situation that cannot work simultaneously.
The radio sensing network of the router of above-mentioned employing periodic wakeup work is particularly useful for the occasion that terminal node translational speed is slow or information updating frequency is low; such as monitor the giant panda in wildlife reserve, or the situation such as the geology in monitoring somewhere, weather and hydrological variation.For the only slowly movement in a certain region usually of the wild animals such as giant panda, people only need even within one day, to obtain once their state every several hours; And for information such as geology, weather and hydrological variation, people may every day, per week even monthly gather primary information it is enough.For above-mentioned situation and analogue, adopt the router of periodic wakeup work can remarkable saves energy, thus significantly improve the operating time of router, avoid the trouble that staff frequently changes battery.
All-router in described radio sensing network all can be arranged to the router of above-mentioned periodic wakeup work, also partly can be arranged to the router of the above-mentioned type.For being placed in the occasion being easy to change battery, or the terminal node frequency of occurrences is high, the router of mobile frequent occasion, also can adopt the router of traditional continuous operation, and only arrange the router of periodic wakeup work in the occasion that the occasion and terminal node of not easily changing battery move slowly or the frequency of occurrences is low.The described here occasion not easily changing battery can be such as the HTHP place etc. of the outer wall of skyscraper, the depths in forest valley or manufacturing shop; the occasion that described terminal node moves slowly or the frequency of occurrences is low can be such as the outermost of monitored wildlife reserve; monitored animal; such as panda, seldom there will be in this.
Described nonvolatile memory 213 is connected with routing module 211, and for the networking topology information of the radio sensing network residing for storage router 11, the higher level of router one 1 and downstream site information, above-mentioned information is called after being woken for routing module 211.Networking between router is a numerous and diverse job during radio sensing network builds, for complex network, this process needs the time of several minutes usually, and router needs to carry out complicated network topology calculating continuously in networking process, and power consumption is huge.After router is restarted at every turn, all will carry out networking, the router one 1 of this embodiment further provided for nonvolatile memory 213 and carrys out storage networking information.After router one 1 is waken up, only needs to read in the normal transmitting-receiving that these information both can carry out data, and all carry out networking after need not waking up at every turn.
In actual applications, enter if control router simply by GPIO pin and exit dormancy, so router node is once enter park mode, then the information in internal memory all can be lost.When router node exits after dormancy enters operating state, first the thing will done rebuilds ZigBee-network topology exactly, although this process can be completed by Zigbee protocol automatically, but this process will expend short then hundreds of millisecond, long then count minutes, no matter be terminal leaf node or router node, coordinator node during this period of time, all need frequent communication, power consumption is very huge.And nonvolatile memory 213 only needs simply to change hardware circuit, external one piece of low capacity low energy consumption non-volatile memory chip.On software view, need to carry out simple modification in Zigbee protocol, make router node all be stored in nonvolatile memory 213 by networking topology, superior node information, downstream site information etc. before going to sleep, and from nonvolatile memory 213, take out above-mentioned information immediately and load in Zigbee protocol stack when exiting dormancy.As can be seen from describing above, the technical scheme of adding nonvolatile memory 213 is very little to the change of existing router on hardware and software, is therefore easy to operation.
The effect of nonvolatile memory 213 is also that routing module 211 can keep in information to be sent in nonvolatile memory 213.Which ensure that in the work slice after this routing module 211 is waken up, the data that the data of failing before dormancy to send, temporarily desynchronizing state cannot be able to be sent and the temporary transient data that cannot send from net state are stored in nonvolatile memory 213 and can not lose.
Described network reconfiguration control module 215 is connected with wake module 212 and routing module 211, for when the number of times that wake module 212 initiates wake command reaches a preset value, send a network reconfiguration order to routing module 211, initiate primary network paging, it can be simple " hello " paging of the whole network, to detect in the higher level of routing module 211 self and downstream site whether there is failure node, and regenerate network topology when there is failure node.Described preset value can be that user preset before layout router one 1.According to the basic function that the process of the distribution structure network topology of effective routing device node is the radio sensing networks such as Zigbee protocol network, repeat no more herein.Network reconfiguration control module 215 can avoid further due to routing module that caused by periodic wakeup cannot Timeliness coverage router failure, and then avoids because certain in network or some router break down and cause the situation of network paralysis to occur.
Next the embodiment of the method for monitor terminal node of the present invention is provided.
Be the implementation step schematic diagram of this embodiment shown in accompanying drawing 3, comprise: step S300, the routing module of router is waken up data bits; Step S310, enters the first quiet period after routing module wakes up immediately; Step S320, routing module transfers the networking topology information of residing radio sensing network, the higher level of this router and downstream site information from nonvolatile memory; Step S330, routing module detects the end node locations information in router coverage, and accepts the reporting information of downstream site; Step S340, routing module, according to the information transferred from nonvolatile memory, is reported the reporting information of above-mentioned end node locations information and downstream site to superior node; Step S350, routing module enters the second quiet period; Step S360, routing module reenters resting state immediately after the second quiet period terminates.
Next please continue to refer to accompanying drawing 1 and the network shown in accompanying drawing 2 and router, each step above-mentioned is elaborated.
In step S300, the routing module of router is waken up data bits.It is realize that the arouse machine processed of the wake module of this step can have various ways.Such as, described wake module can be by a Timer Controlling, periodically wakes routing module up; Or any time before each dormancy of routing module obtains a wakeup time and is stored in wake module from radio sensing network, and control to wake routing module up according to this wakeup time.In the execution mode adopting timer, described routing module can also require a clock calibrating signal being in the radio sensing network of any time under wake-up states to router place, and calibrates timer.
In step S310, enter the first quiet period immediately after routing module wakes up, in described first quiet period, routing module only accepts data and does not send data.This step is optional step." silence period edge " is used to avoid information dropout.Forward that moment of operating state to from dormancy, whole network equipment does not send data and receives only data, after the several milliseconds of times of mourning in silence, just starts normal data input and data output.This step ensure that indivedual router node due to router step different from each other, loss of data occurs because of the moment of the firm startup that reason causes such as clock jitter, start-up course be slower.
Step S320, routing module transfers the networking topology information of residing radio sensing network, the higher level of this router and downstream site information from nonvolatile memory.Networking between router is a numerous and diverse job during radio sensing network builds, for complex network, this process needs the time of several minutes usually, and router needs to carry out complicated network topology calculating continuously in networking process, and power consumption is huge.After router is restarted at every turn, all will carry out networking, the object performing this step is, after router is waken up, only needs to read in the normal transmitting-receiving that these information both can carry out data, and all carries out networking after need not waking up at every turn.
Because routing module is by work of short duration after periodic wakeup, be therefore easy to occur router failure and cannot the situation of Timeliness coverage.Therefore a network reconfiguration control module can also be set in the router, before entering normal operating conditions, the step that a network detects can also be performed further.This step also all performs after need not waking up at every turn, also can be when the number of times that wake module initiates wake command reaches a preset value, initiate primary network paging by network reconfiguration control module.ICQ is initiated in the network reconfiguration order that routing module sends according to the network reconfiguration control module that receives, detects in the higher level of this router self and downstream site whether there is failure node, if there is failure node, then regenerates network topology.If do not find that there is the node of inefficacy, then continue to perform step below.After regenerating network topology, need the networking topology information of new radio sensing network, the higher level of this router and downstream site information etc. to be stored into the information before nonvolatile memory also replaces.
Step S330, routing module detects the end node locations information in router coverage, and accepts the reporting information of downstream site; Step S340, routing module, according to the information transferred from nonvolatile memory, is reported the reporting information of above-mentioned end node locations information and downstream site to superior node.The mode of operation of the router-module of above-mentioned two steps is identical with the router mode of operation in common radio sensing network, and the operating state of the radio sensing network in this step is substantially identical with wireless sense network network of the prior art.
Step S350, routing module enters the second quiet period, and in described second quiet period, routing module only accepts data and do not send data.This step is optional step.As the explanation to step S310, " silence period edge " is used to avoid information dropout.Forward that moment of dormancy to from operating state, whole network equipment does not send data and receives only data, after the several milliseconds of times of mourning in silence, just starts to enter dormancy.This step ensure that indivedual router node because of clock jitter, enter the moment before dormancy that enters that the reasons such as sleep procedure is slower cause, due to router step different from each other, loss of data occur.
Step S360, routing module reenters resting state immediately after the second quiet period terminates.Routing module under resting state is reservation thread communicated with wake module, therefore in the dormant state, the power consumption of routing module is extremely low.When the routing module of resting state works next time, still perform above-mentioned circulation.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (9)
1. a router, is applied in radio sensing network, it is characterized in that, comprises a routing module, a wake module and a nonvolatile memory;
Described wake module is connected to routing module, for periodically waking the routing module being in resting state up;
Described nonvolatile memory is connected with routing module, and for the networking topology information of the radio sensing network residing for storage router, the higher level of this router and downstream site information, above-mentioned information is called after being woken for routing module;
Described router comprises a network reconfiguration control module further, described network reconfiguration control module is connected with wake module and routing module, for when the number of times that wake module initiates wake command reaches a preset value, send a network reconfiguration order to routing module, initiate primary network paging, to detect in self higher level and downstream site whether there is failure node, and regenerate network topology when there is failure node.
2. router according to claim 1, is characterized in that, comprises a timer further, and described timer is connected with wake module, periodically wakes routing module up for controlling wake module.
3. router according to claim 2, is characterized in that, described timer is connected with routing module further, for receiving the clock alignment signal in the radio sensing network that comes from residing for router.
4. adopt a method for the monitor terminal node of router according to claim 1, it is characterized in that, described method comprises the steps:
A the routing module of () router is waken up data bits;
B () routing module transfers the networking topology information of residing radio sensing network, the higher level of this router and downstream site information from nonvolatile memory;
(f1) ICQ is initiated in the network reconfiguration order that routing module sends according to the network reconfiguration control module received when the number of times of wake module initiation wake command reaches a preset value, detect in the higher level of this router self and downstream site and whether there is failure node, if there is failure node, then perform step (f2), otherwise perform step (c);
(f2) network topology is regenerated; C () routing module detects the end node locations information in router coverage, and accept the reporting information of downstream site;
D () routing module, according to the information transferred from nonvolatile memory, is reported the reporting information of above-mentioned end node locations information and downstream site to superior node;
E () routing module reenters resting state.
5. the method for monitor terminal node according to claim 4, is characterized in that, in described step (a), described wake module, by a Timer Controlling, periodically wakes routing module up.
6. the method for monitor terminal node according to claim 5, it is characterized in that, before step (e), comprise described routing module further and require a clock calibrating signal to the radio sensing network at router place, and calibrate the step of timer.
7. the method for monitor terminal node according to claim 4, it is characterized in that, before step (e), comprise radio sensing network request one wakeup time of described routing module to router place further, and be stored to the step of wake module, in described step (a), wake module wakes routing module up according to this wakeup time.
8. the method for monitor terminal node according to claim 4, is characterized in that, comprises the steps: further between described step (a) and (b)
(g1) routing module enters the first quiet period after being waken up data bits immediately, and in described first quiet period, routing module receives only data and do not send data, after the first quiet period terminates, continues to perform step (b).
9. the method for monitor terminal node according to claim 4, is characterized in that, comprises the steps: further between described step (d) and (e)
(g2) first routing module enters the second quiet period before dormancy, and in described second quiet period, routing module receives only data and do not send data, after the second quiet period terminates, continues to perform step (e).
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| CN102083162A (en) * | 2011-01-21 | 2011-06-01 | 河海大学常州校区 | Greedy multi-path routing method of wireless multimedia sensor network based on QoS (Quality of Service) |
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| 无线传感器网络低占空比MAC协议研究;李群等;《单片机与嵌入式系统应用》;20081231(第7期);正文1-3节及附图2-5 * |
| 无线传感网络动态休眠通信协议研究;石军锋;《中国优秀硕士学位论文全文数据库信息科技辑》;20090615(第6期);正文第1.2.2、1.4-1.6、2.2-2.4、3.1-3.3节及附图2.3、2.8 * |
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