CN103327586B - The synchronous method of wireless sensing net node suspend mode low power consumption protocol - Google Patents
The synchronous method of wireless sensing net node suspend mode low power consumption protocol Download PDFInfo
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- CN103327586B CN103327586B CN201310205184.0A CN201310205184A CN103327586B CN 103327586 B CN103327586 B CN 103327586B CN 201310205184 A CN201310205184 A CN 201310205184A CN 103327586 B CN103327586 B CN 103327586B
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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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- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a kind of synchronous method of wireless sensing net node suspend mode low power consumption protocol, the MCU for control node working condition is equipped at node, in the case where MCU is in running order, clock is provided using the external clock reference of external crystal-controlled oscillation or other forms, MCU in a dormant state under, clock is provided using internal oscillator circuit, during node participates in networking, by using the synchronous mode that floods, it realizes the autonomous layering networking of separate nodes, while realizing hierarchical synchronization of the network from root node to endpoint node.The present invention can fully ensure that nodal clock precision, network clocking synchronization and normal use, while node and network power consumption is effectively reduced.
Description
Technical field
The present invention relates to wireless sense network Clock Synchronization Technology fields, and in particular to a kind of wireless sensing net node suspend mode is low
The synchronous method of power consumption agreement.
Background technique
WSN is the abbreviation of wireless sensor network, i.e. wireless sensor network.Wireless sensor network WSN
Formed by being deployed in a large amount of cheap microsensor node in monitoring region, by wireless communication mode formed more than one
The network system of the self-organizing of jump, the purpose is to collaboratively perceive, acquire and handle to be perceived object in network's coverage area
Information, and it is sent to observer.It is convenient and powerful due to WSN, it is increasingly taken seriously, but power consumption and Clock Synchronization Technology are always
The key points and difficulties being considered as in WSN application.
Present wireless sense network application increasingly payes attention to low-power consumption, and industry proposes many sides for realizing network low-power consumption
The agreement of case, such as SMAC, BMAC and TMAC etc, it is the focus time in running order in sensor node, various
Agreement by come reduce the node in running order time as much as possible realize reduce sensor node power consumption purpose, so
And the power consumption that node generates in the dormant state is had ignored, since practical application interior joint is only needing to transmit data or is holding
It just needs to wake up when row some nodal operation tasks, therefore the suspend mode of node accounts for most times, if node
Dormancy power consumption can reduce, and will effectively reduce the power consumption of node, while the power consumption of whole network is also effectively reduced.
Existing sensor node provides multiple clock scheme, and general node M CU supports external crystal-controlled oscillation, external clock electricity
Road, internal clocking generation module.Under comparing, external crystal-controlled oscillation and outer clock circuit generate biggish power consumption, internal clocking
Generation module power consumption is minimum；But exactly the opposite for the clock accuracy that MCU is provided, internal clocking generation module precision is worst.Since
MCU is that we provide the internal clocking generation modules of low-power consumption, while MCU in the dormant state wants the clock accuracy of itself
Ask not high, if MCU can will be effectively reduced effectively using internal oscillator circuit as the clock source under MCU dormant state
Power consumption.
Summary of the invention
It is an object of that present invention to provide a kind of synchronous method of wireless sensing net node suspend mode low power consumption protocol, energy of the present invention
It enough fully ensures that nodal clock precision, network clocking synchronization and normal use, while node and network power consumption is effectively reduced.
In order to solve these problems in the prior art, present invention provide the technical scheme that
A kind of synchronous method of wireless sensing net node suspend mode low power consumption protocol is equipped with for control node work at node
The MCU for making state provides clock using the external clock reference of external crystal-controlled oscillation or other forms in the case where MCU is in running order,
MCU in a dormant state under, using internal oscillator circuit provide clock, node participate in networking during, by using general
The synchronous mode of flood, realizes the autonomous layering networking of separate nodes, while realizing layering of the network from root node to endpoint node
It is synchronous.
At present in common sensor network application, the clock majority of node using external crystal-controlled oscillation or other compared with precision compared with
High external clock reference provides.Such technology is effective to ensure that the clock accuracy of node in the application, but simultaneously in MCU
When suspend mode, peripheral circuit and peripheral interface also produce some unnecessary power consumptions, while some MCU internal modules can not
Complete suspend mode produces part power consumption.Sleep clock such as is provided for MCU using internal clocking generation module substitution external clock reference,
It will can completely close MCU peripheral interface, close peripheral circuit and some internal modules of MCU, therefore be able to achieve MCU suspend mode
Lowest power consumption, effectively reduce the dormancy power consumption of node.But since internal clocking generation module clock accuracy is not high, using interior
Portion's clock generation module, which provides clock, will introduce clocking error, influence the normal communication of node, while to wireless sensor network
Networking it is synchronous with network clocking all produce influence, the present invention solves error problem for deficiency, thus by this technology reality
With change.
For above-mentioned technical proposal, there are also further optimal enforcement schemes by inventor.
As optimization, broadcast mode communication network time data packet, including following key step are utilized:
Base-station node in the step 1. network node synchronous with clock has been completed is broadcast periodically beacon data
Packet, clock reference node of these sensor nodes as node to be synchronized；
Step 2. node to be synchronized listens to network data, receives the beacon data packet in network, unpacks and saves transmission
The hierarchical information of the MAC of node, the temporal information of sending node and sending node ensure that oneself twice can according to these information
The time data packet that same sending node is sent is received, according to the temporal information received twice and the temporal information of itself,
It realizes the calibration to itself clock, while realizing the AUTOMATIC ZONING of newly added node, the whole network according to the hierarchical information of sending node
Node realizes hierarchical synchronization by the mode of flooding from root node to endpoint node.
In the present invention, synchronization node begins listening for network data after powering on, when receiving first heartbeat packet (beacon packet)
Afterwards, the transmission time information and the temporal information of oneself of sending node are recorded according to the data in heartbeat packet, then suspend mode,
Sleep time was set to less than beacon period.After waking up nodes, network is listened to again, if received and first heartbeat packet phase
With the heartbeat packet in source, then the transmission time information of sending node is recorded again, while recording the information of oneself, then root
Sent twice according to sending node interval time it is poor and itself receiving time difference is calculated due to using internal oscillator circuit to make twice
The error introduced for clock source.Know that error can be completed to carry out clock alignment to receiving node.Clock calibration process is for example attached
Shown in Fig. 1.
The synchronous realization of network clocking, practical is exactly the clock alignment for being all nodes in network, this process passes through timesharing
The mode to flood realizes, the level of oneself is confirmed according to the data source received when network is added in new node, is gone forward side by side
Row clock calibration operation, after completing calibration, the node is by as node broadcasts heartbeat packet synchronized in network, and declaration is certainly
Oneself survives in a network, while the calibration reference mode as next hierarchy node.And so on, network since root node,
At interval of n heart beat cycle (period for sending heartbeat packet), next node layer is realized and is synchronized, network end-point is finally reached, it is real
The now synchronization of all nodes.
As optimization, realize clock alignment with it is synchronous on the basis of, the dormancy awakening mechanism used is the biography of degression type
Sensor node suspend mode, the sleep time of node M CU are realized by configuring real-time clock interrupt module (RTI), are stopped when node enters
After sleep mode, MCU compensates nodal clock into RTI interrupt service routine, root according to the long suspend mode of timing that RTI is arranged
According to residue can sleep time and configurable RTI time length comparison, reconfigure RTI duration, configure maximum available duration for RTI.
The suspend mode of MCU is realized by the configuration of RTI, and way under normal conditions is the RTI that MCU is fixed
Configuration, i.e., each sleep time fixes, and wakes up laggard row clock compensation, then secondary dormancy, by this multiple process, realize to compared with
Long dormancy time approaches, the configuration that can not achieve and require sleep time completely the same.What such application scheme was realized
It is the suspend mode of rough duration, if duration configuration in the interval RTI is larger, node will enter RTI interrupt routine between waking up twice
Number is less, but node last time enters MCU after RTI interrupt routine and begins to enter standby mode, from enter etc. until into
Enter working condition, is less than the interval the RTI duration of configuration this period, it is possible to it is longer, therefore introduce larger power consumption；If RTI
Interval duration configuration is smaller, and the duration that MCU is in standby mode is smaller, but node will repeatedly enter RTI between waking up twice
Interrupt routine equally introduces more power consumption, and increases the work load of MCU.Dormancy awakening mechanism proposed by the present invention is one
Kind adaptive suspend mode, according to current point in time to the time interval between waking up nodes time point and between RTI can configure
Every duration, MCU self-setting one interval RTI duration as big as possible interrupts journey when node enters RTI subsequently into suspend mode
When sequence, the value of RIT is arranged again according to Rule of judgment by MCU, until node can sleep time be less than the minimum configurable interval RTI
Duration, MCU enter wait state, which can effectively reduce that MCU enters the number of RTI and MCU is waited for
Duration so that the MCU power consumption of reduction in a dormant state that the MCU time as far as possible is long.
Scheme in compared with the existing technology, the invention has the advantages that
The synchronous method of wireless sensing net node suspend mode low power consumption protocol disclosed in this invention, may be implemented node
Doubleclocking application.The result that the present invention finally realizes is to fully ensure that nodal clock precision, network clocking are synchronous and normally make
With, while node and network power consumption is effectively reduced.
Detailed description of the invention
The invention will be further described with reference to the accompanying drawings and embodiments:
Fig. 1 is interior joint of embodiment of the present invention clock calibration process schematic diagram；
Fig. 2 is the network structure model of the wireless sense network in the embodiment of the present invention；
Fig. 3 is the time model of interior joint of embodiment of the present invention dormancy mechanism；
Fig. 4 is that the nodal clock in the embodiment of the present invention is calibrated and synchronous flow chart；
Fig. 5 is the Network Synchronization time model in the embodiment of the present invention；
Fig. 6 is the process that the dormancy mechanism of interior joint of the embodiment of the present invention is realized.
Specific embodiment
Above scheme is described further below in conjunction with specific embodiment.It should be understood that these embodiments are for illustrating
The present invention and be not limited to limit the scope of the invention.Implementation condition used in the examples can be done according to the condition of specific producer
Further adjustment, the implementation condition being not specified is usually the condition in routine experiment.
Embodiment:
Present embodiment describes a kind of synchronous method of wireless sensing net node suspend mode low power consumption protocol, it is equipped at node
For the MCU of control node working condition, in the case where MCU is in running order, the outside of external crystal-controlled oscillation or other forms is used
Clock source provide clock, MCU in a dormant state under, using internal oscillator circuit provide clock, node participate in networking
Cheng Zhong realizes the autonomous layering networking of separate nodes by using the synchronous mode that floods, at the same realize network from root node to
The hierarchical synchronization of endpoint node.
Utilize broadcast mode communication network time data packet, including following key step:
Base-station node in the step 1. network node synchronous with clock has been completed is broadcast periodically beacon data
Packet, clock reference node of these sensor nodes as node to be synchronized；
Step 2. node to be synchronized listens to network data, receives the beacon data packet in network, unpacks and saves transmission
The hierarchical information of the MAC of node, the temporal information of sending node and sending node ensure that oneself twice can according to these information
The time data packet that same sending node is sent is received, according to the temporal information received twice and the temporal information of itself,
It realizes the calibration to itself clock, while realizing the AUTOMATIC ZONING of newly added node, the whole network according to the hierarchical information of sending node
Node realizes hierarchical synchronization by the mode of flooding from root node to endpoint node.
As optimization, realize clock alignment with it is synchronous on the basis of, the dormancy awakening mechanism used is the biography of degression type
Sensor node suspend mode, the sleep time of node M CU are realized by configuring real-time clock interrupt module (RTI), are stopped when node enters
After sleep mode, MCU compensates nodal clock into RTI interrupt service routine, root according to the long suspend mode of timing that RTI is arranged
According to residue can sleep time and configurable RTI time length comparison, reconfigure RTI duration, configure maximum available duration for RTI.
In the present embodiment, specific step is as follows for wireless sense network synchronizes and suspend mode control:
1. nodal clock is calibrated；
When node needs to carry out clock alignment, the specific steps are as follows:
(1) network data is begun listening for after needing the node that synchronizes to power on, when receiving first beacon number
It when according to packet, unpacks and obtains data, record the MAC Address of the data packet sending node recorded in received data packet, send
Level n, the sending node transmission time information T of nodes1.According to the level of sending node, oneself clear level of receiving node
For n+1；The MAC for recording sending node can specify node received beacon data packet next time according to the MAC of sending node
It must carry out the node of this same MAC；Record the current time information T of receiving node oneselfr1。
(2) a relatively reasonable node dormancy duration t is configured by setting RTI, then node enters suspend mode.
(3) after suspend mode has been timed to, waking up nodes begin listening for the data packet of the MAC of record.In receiving network
Data after, if it is nodes records the corresponding source node of MAC send beacon data packet after, then unpacked, obtain
Data record the sending node transmission time information T recorded in received data packets2, while record this moment oneself
Temporal information Tr2, it is possible thereby to be calculated sending node (reference mode) send twice between time interval Ts=Ts2-Ts1,
Time interval T between receiving twicer=Tr2-Tr1, outer due to being used as sending node under receiving node wake-up states
Portion's clock, relative error rate is negligible, it is possible thereby to which the time error for determining receiving node and sending node is shaken by inside
Circuit introducing is swung, and the error introduced when suspend mode is with respect to the clocking error rate of sending node | Tr-Ts|/t, according to error
Rate error corresponding with the clock that sleep time can calculate each suspend mode, compensates i.e. adjustable according to this error and connects
Nodal clock is received, while temporal and sending node time are adjusted to the same time, is completed same with the clock of sending node
Step.Receiving node workflow is as shown in Fig. 3.
2. the whole network is synchronous；
Assuming that node a is the node of Level1, node b is the node of Level2, and the node d that node c is Level3 is
The node of Levelm.The whole network duty cycle is set as T=n*T by the present inventionbeacon, i.e., it is every to cross data transmission of T time progress,
Simultaneously in each T time section, the node being in network is synchronized once to guarantee that the clock of network node is synchronous.
Node a is the node of Level1, in TbeaconMoment starts the clock alignment and synchronizing process of above-mentioned node, node a
When listening to network data, since network or external environment change, possible node a is far from base-station node, and a might not at this time
It is suitable as the node of Level1, therefore node not only listens to the beacon packet of base-station node in interception data, but detectd
Listen whole network data, it is assumed that node a listens to first beacon packet from Level1, then node a updates the hierarchical information of oneself
For Level2, heartbeat packet is then broadcasted, declares oneself to have completed to synchronize.
Node b is the node of Level2, in (2*2-1) TbeaconMoment carry out the clock alignment of above-mentioned node with it is synchronous
Journey.
Node c is the node of Level3, in (2*3-1) TbeaconMoment carry out the clock alignment of above-mentioned node with it is synchronous
Journey.
Node d is the node of Levelm, (2*m-1) TbeaconMoment carries out the clock alignment and synchronizing process of above-mentioned node.
Time model is as shown in Fig. 5.
3. node dormancy and wake-up mechanism
After completing nodal clock calibration and Network Synchronization, node enters normal mode of operation, and carries out periodicity
Suspend mode and wake-up.
As an example with a node of above-mentioned hypothesis, the wireless biography of the MC131213 model MCU based on Freescale is selected
Net node is felt as actual loading test platform.Complete clock alignment with it is synchronous after, node a enters normal mode of operation.Assuming that section
The every 1s of point a wakes up once, 1.024s, 512ms, 256ms duration at equal intervals can be achieved according to the configuration of RTI, we select 256ms
As the Configuration Values of original scheme, when MCU enters RTI interrupt routine, judge whether remaining time carries out 256ms's again enough
Suspend mode, if can if go successively to suspend mode, when MCU third time enter RTI interrupt routine after, node residue can sleep time about
For 230ms (it is about 1ms that RTI, which interrupts implementation procedure), it is less than 256ms, node will be unable to be again introduced into dormant state, remain waiting for
At the time point that state terminates until suspend mode, this will introduce a large amount of power consumption.
This scheme is compared, dormancy mechanism of the invention requires suspend mode 1s according to node a, and setting first time sleep time is
512ms judges whether remaining sleep time meets the suspend mode for continuing 512ms when MCU enters RTI interrupt routine, it is clear that
It is unsatisfactory for, resetting RTI is 256ms；When MCU enters RTI interrupt routine for the second time, judges whether to meet again and continue
The suspend mode of 256ms, is unsatisfactory for, therefore resetting RTI is 128ms, this process of repetition knows that residual time length is less than minimum and can stop
Dormancy duration, the time majority that MCU last in this way is in waiting state are all converted into dormant state, hence it is evident that reduce node power consumption.Section
The implementation process of point dormancy mechanism is as shown in Fig. 6.
The foregoing examples are merely illustrative of the technical concept and features of the invention, its object is to allow the person skilled in the art to be
It cans understand the content of the present invention and implement it accordingly, it is not intended to limit the scope of the present invention.It is all smart according to the present invention
The equivalent transformation or modification that refreshing essence is done, should be covered by the protection scope of the present invention.
Claims (2)
1. a kind of synchronous method of wireless sensing net node suspend mode low power consumption protocol, it is equipped at node for control node work
Make the MCU of state, which is characterized in that in the case where MCU is in running order, use the outside of external crystal-controlled oscillation or other forms
Clock source provide clock, MCU in a dormant state under, using internal oscillator circuit provide clock, node participate in networking
In the process, it by using the synchronous mode that floods, realizes the autonomous layering networking of separate nodes, while realizing network from root section
Point arrives the hierarchical synchronization of endpoint node, realize clock alignment with it is synchronous on the basis of, the dormancy awakening mechanism that uses is successively decreases
The sensor node dormancy of formula, the sleep time of node M CU is realized by configuring real-time clock interrupt module (RTI), works as section
After point enters suspend mode, MCU is according to the long suspend mode of timing that RTI is arranged, when into RTI interrupt service routine to node
Clock compensates, according to residue can sleep time and configurable RTI time length comparison, RTI duration is reconfigured, by RTI
It is configured to maximum available duration.
2. the synchronous method of the wireless sensing net node suspend mode low power consumption protocol according to claim 1, which is characterized in that
Utilize broadcast mode communication network time data packet, including following key step:
Base-station node in the step 1. network node synchronous with clock has been completed is broadcast periodically beacon data
Packet, clock reference node of these sensor nodes as node to be synchronized；
Step 2. node to be synchronized listens to network data, receives the beacon data packet in network, unpacks and saves transmission
The hierarchical information of the MAC of node, the temporal information of sending node and sending node ensure oneself twice according to these information
The time data packet that same sending node is sent can be received, is believed according to the temporal information received twice and the time of itself
Breath realizes the calibration to itself clock, while the AUTOMATIC ZONING of newly added node is realized according to the hierarchical information of sending node,
The whole network node realizes hierarchical synchronization by the mode of flooding from root node to endpoint node.
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| CN104950829B (en) * | 2014-03-31 | 2018-04-27 | 奇点新源国际技术开发(北京)有限公司 | A kind of bus system power consumption control method and device |
| CN104917581B (en) * | 2015-06-29 | 2018-02-02 | 小米科技有限责任公司 | Bearing calibration, device, terminal and the router of system time |
| CN107249210B (en) * | 2017-06-26 | 2023-06-09 | 欧普照明股份有限公司 | Wireless device communication method and system |
| CN107635244A (en) * | 2017-08-29 | 2018-01-26 | 深圳市盛路物联通讯技术有限公司 | Electricity-saving control method and device applied to internet-of-things terminal |
| CN107656455A (en) * | 2017-09-28 | 2018-02-02 | 杭州古北电子科技有限公司 | A kind of implementation method and device of low-power consumption panel-switch |
| CN107818676A (en) * | 2017-12-13 | 2018-03-20 | 天津诚意创达科技有限公司 | A kind of low power consumption data acquiring and transmission system and implementation method based on clock chip |
| CN109765985B (en) * | 2018-12-25 | 2022-11-22 | 赛特威尔电子股份有限公司 | Method, system and device for controlling intermittent work of single chip microcomputer |
| CN110881214A (en) * | 2019-11-19 | 2020-03-13 | 天津大学 | Time synchronization method of wireless sensor network |
| CN112769579A (en) * | 2020-12-31 | 2021-05-07 | 上海遨有信息技术有限公司 | Hierarchical self-adaptive synchronous dormancy method for hardware nodes in field of power Internet of things |
| CN113133081B (en) * | 2021-04-21 | 2023-03-24 | 无锡职业技术学院 | Energy-saving transmission method for wireless ad hoc network |
| CN113645683B (en) * | 2021-10-14 | 2021-12-24 | 昂科信息技术（上海）股份有限公司 | Crystal oscillator self-adaptive clock synchronization method and system |
| CN115022956B (en) * | 2022-04-27 | 2024-01-12 | 海能达通信股份有限公司 | Synchronization method, system, electronic equipment and storage medium of self-organizing network |
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