CN110166952A - Collection method for wireless sensor network data and system based on broadcast synchronization - Google Patents
Collection method for wireless sensor network data and system based on broadcast synchronization Download PDFInfo
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- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
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Abstract
The invention discloses a kind of collection method for wireless sensor network data and system based on broadcast synchronization, the acquisition method specifically: host node proofreads respective sample clock generator according to time calibration information to all-network sensor node broadcasts synchronous head, network sensor node；According to polling cycle and the determination of respective sampling multiplying power or update respective sampling rate；According to time slot allocation information, sampled data is packaged by sample time order and is sent to host node in the form of datagram；Host node parses the content of each datagram, reappears the data of each network sensor node, is sent to comprehensive control machine or telemetry system.The present invention realizes the whole network management and data collection using host broadcast message, simple and reliable, and data synchronization accuracy is high, and the data of each periodic report are isometric, facilitate hardware handles, can dynamically change sampling rate, solve the problems of the prior art.
Description
Technical field
The invention belongs to wireless communication technology fields, are related to wireless sensor network data collection technique more particularly to one
Collection method for wireless sensor network data and system of the kind based on broadcast synchronization.
Background technique
With the development of sensor technology and the communication technology, sensor network technique has been applied to environmental monitoring, state
The numerous areas such as monitoring.During actual deployment and application, in order to complete to target environment/state comprehensive detection, allusion quotation
The sensor network of type often has a characteristic that
1. sensor type is various.Particular sensor can only often measure one of numerous environmental parameters, such as temperature, pressure
Power etc., in order to obtain the multiple parameters of target environment simultaneously, sensor network generally requires to dispose a variety of different types of sensings
Device measures.
2. sensing data rate multiplicity.Since the property of the physical quantity of different sensors measurement is not quite similar, need
The sample rate wanted, the parameters such as sampling precision are also not quite similar, thus cause the output speed of different sensors different.
3. network needs time unifying.Since each sensor is independent progress DATA REASONING, in order to guarantee the measurement obtained
Value is the description for the different angle that synchronization treats measuring system, it is therefore desirable to carry out the DATA REASONING time to each sensor
It is aligned.
The characteristics of sensor type multiplicity, data rate are various in sensor network and need time unifying, shared
In channel-type (such as bus-type, radio broadcasting type) network, it can come to the collection belt of sensor network data following difficult:
1. being difficult to realize fixed length packet packet switch.Due to multiple sensor node sampling periods and network data collection period
It being difficult to synchronize, this allows for the data Length discrepancy of each periodic report of sensor node, it can not be swapped using fixed length message,
It needs a set of cache management mechanism to guarantee that all data are handled in order, increases the processing complexity of datagram.
2. needing complicated timing system.It is sampled simultaneously since each sensor node is independent according to local clock
Timestamp is beaten to the data of acquisition, clock drift equal error long-term accumulation can make sampled data invalid, it is therefore desirable to which the whole network is same
Step system calibrates clock, needs the clock alignment system of a set of complexity to guarantee the synchronization of sampled data.
3. being difficult to dynamic changes sampling rate.Sensor network carries out data often through the time slot allocated in advance and leads to
Letter, for there is the sensor node of bursty data or emergency data, it is difficult to dynamic adjustment time slot (bandwidth).
Summary of the invention
To solve the above-mentioned problems, the present invention provides a kind of wireless sensor network data acquisition side based on broadcast synchronization
Method realizes the whole network management and data collection using host broadcast message, simple and reliable, and data synchronization accuracy is high, on each period
The data of report are isometric, facilitate hardware handles, can dynamically change sampling rate, solve the problems of the prior art.
The wireless sensor network data acquisition system based on broadcast synchronization that it is another object of the invention to provide a kind of.
The technical scheme adopted by the invention is that a kind of wireless sensor network data acquisition side based on broadcast synchronization
Method specifically follows the steps below:
S1, for host node to all-network sensor node broadcasts synchronous head, synchronous head includes time calibration information, network
Sensor node sequence table, polling cycle, all-network sensor node sampling multiplying power and time slot allocation information；
S2, network sensor node calculate the time migration for being each based on the starting broadcast of this period according to time calibration information
Amount, proofreads respective sample clock generator using time offset；
S3, network sensor node determine or update respective sampling rate according to polling cycle and respective sampling multiplying power；
Sampled data is packaged and with number by S4, network sensor node according to time slot allocation information by sample time order
Host node is sent to according to the form of report；
S5, host node reappear the data of each network sensor node from the content of each datagram of protocol analysis, pass
It send to comprehensive control machine or telemetry system.
Further, in the step S1, the determination method of multiplying power is sampled: with all-network sensor node corresponding data
The greatest common divisor of source sampling rate is as the network samples period, and each network sensor node is according to oneself data source sampling
The sampling multiplying power of the rate configuration data source.
Further, in the step S1, network sensor sequence node table includes the network sensing that this inquires selection
Device node ID number, the network sensor number of nodes selected are K, and K≤N, N represent network sensor node total number.
Further, in the step S1, broadcasting packet field includes the time slot configuration information of message attribute and each node；
Message attribute includes message length, sequence number, time calibration information, polling cycle, and the time slot configuration information of each node includes net
Network sensor node ID number, time slot allocation information, slot time section.
Further, in the step S1, host node is repeated as many times continuous broadcast together to all-network sensor node
Walk head.
Further, in the step S1, network internal uses TD mode, the shared number of multiple network sensor node timesharing
According to bandwidth.
Further, the step S4 further includes error correction and retransmission feedback mechanism, but must be completed in distribution time slot；Number
Terminate according to communication window, is all forced into standby mode regardless of whether working, concedes channel.
Further, in the step S5, the data of each network sensor node are reappeared, specifically: host node connects
The data frame for receiving all-network sensor node is packaged data frame by network sensor sequence node table, encloses corresponding network
The timestamp of sensor node acquisition data.
A kind of wireless sensor network data acquisition system based on broadcast synchronization, using above-mentioned a kind of based on broadcast synchronization
Collection method for wireless sensor network data, comprising:
Host node, for all-network sensor node broadcasts synchronous head, synchronous head to include time calibration information, net
The sequence table of network sensor node, polling cycle, all-network sensor node sampling multiplying power and time slot allocation information；While from
The content of each datagram of protocol analysis reappears the data of each network sensor node, is sent to comprehensive control machine or telemetry system；
Network sensor node is each based on the starting of this period according to time calibration information calculating for receiving synchronous head
The time offset of broadcast proofreads respective sample clock generator using time offset；According to polling cycle and respectively
Sampling multiplying power, determine or update respective sampling rate；Sampled data is pressed into sample time order according to time slot allocation information
It is packaged and is sent to host node in the form of datagram.
The invention has the advantages that having the advantage that
It is 1. realize the whole network management and data collection using host broadcast message, simple and reliable, it can be by continuously broadcasting
Mode improves reliability；Each network sensor node is synchronized with radio broadcasting, all-network sensor node is wide using one
It broadcasts, therefore can be fully synchronized, ensure that the sampling beat of all nodes is synchronous, improve data synchronization accuracy, it can be effective
It solves the problems, such as to improve data validity since time drift equal error bring data are asynchronous.
2. broadcast packet carries rate information, it can dynamically change sampling rate as unit of the period；Since sampling rate is by looking into
It askes the period and sampling multiplying power determines, each broadcasting packet all contains the sampling times of this polling cycle length and each node
Rate information, i.e. broadcast packet carry rate information, and realization can dynamically be changed sampling rate as unit of the period, system is facilitated flexibly to adjust
With resource, processing burst or emergency data.
3. network sensor node receives any one subsynchronous head, polling cycle is obtained, utilizes sampling multiplying power bound data
Source sampling rate, network sensor node reset sampling interval in this period and sampled point time in each reception broadcast,
Stringent and broadcast polling cycle is synchronous so that under similarly configuring the same each periodic report of network sensor node data etc.
It is long, facilitate hardware handles, reduce the processing complexity of datagram, improves treatment effeciency.
4. the present invention realizes the light-weight design of network sensor node, network sensor node each period only needs
It resets sample rate and returns to upper cycle data, all time slot allocations, sampling configuration and node enter and leave network operation
Different broadcast datas can be configured by host node offers realization.
It is simple and reliable the present invention is based on the wireless sensor network data acquisition system of broadcast synchronization, realize fixed length packet point
Group exchange, is greatly reduced network sensor nodal clock drift error, can dynamically change sampling rate, pass through host node
It configures different broadcast datas and offers realization, realize the light-weight design of network sensor node.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is network topological diagram in the embodiment of the present invention.
Fig. 2 is that broadcasting packet field is illustrated in the embodiment of the present invention.
Fig. 3 is the communication logic flow chart of host node in the embodiment of the present invention.
Fig. 4 is the communication logic flow chart of network sensor node in the embodiment of the present invention.
Fig. 5 is JWSN series wireless network data schematic diagram of transmission process.
Specific embodiment
Below in conjunction with the embodiment of the present invention, technical scheme in the embodiment of the invention is clearly and completely described,
Obviously, described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based in the present invention
Embodiment, every other embodiment obtained by those of ordinary skill in the art without making creative efforts, all
Belong to the scope of protection of the invention.
Inside spacecraft, the sampling of use is to determine frequency, typically 40Hz, 80Hz, until 40Khz, in order to
The radio frequency channel of telemetry frame is corresponding, and the sensor of standard obeys stringent multiplying power relationship.Each sensor is independent clock, needs to lead
Machine is equipped with sampler and coder and does synchronization.Such as use wireless network transmissions, sampler and coder is generally in sensor side, it is therefore desirable to wireless network from
Inquire the sampling time of synchronous sensor in signaling.Thinking of the invention is that host node uses broadcast packet+time offset
Form synchronizes the acquisition time of the whole network sensor node, synchronizes each network sensor node, network with radio broadcasting
Since the sampling time of sensor node counted synchronizing, and being equivalent to is to receive order and then surely a sampling duration every time,
The asynchronous bring offset problem of clock can be eliminated.Polling cycle defines all-network this period of time of sensor node
Data acquire duration, and then by the sampling rate of sampling multiplying power regulating networks sensor node, i.e. broadcast packet carries sampling speed
Rate information is adjusted the sampling rate of network sensor node, and network sensor node carries out data according to sampling multiplying power and adopts
Collection so that the length that consolidated network sensor node samples every time is consistent, and will be collected according to the time slot obtained from broadcast packet
Data be sent to host node, host node reappears each network sensor section from the content of each datagram of protocol analysis
The data of point.When reappearing data, the data of each network sensor node is needed to acquire moment alignment, such system data just has
Meaning, such as height and temperature Rate's linkage, it is seen that the specific data under some flight attitude.Network sensor node is passive
, different broadcast datas is configured by host node and offers realization.
Collection method for wireless sensor network data based on broadcast synchronization, specifically follows the steps below:
S1, for the time delay for guaranteeing real-time and determining, network internal uses TD mode, multiple network sensor nodes point
When shared data bandwidth, as shown in Figure 1；Host node is to all-network sensor node broadcasts synchronous head, when synchronous head includes
Between calibration information (offset), network sensor sequence node table, polling cycle (duration), each network sensor node
Sample multiplying power and time slot allocation information；
Host node is to the continuous broadcast synchronization head of all-network sensor node, repeatedly, generally two or three times.Using even
The mode of continuous broadcast improves reliability, sends successfully every time or is unsuccessfully independent random event, such as the mistake of single transmission
Losing rate is 1 × 10-3, the probability of failure is then 1 × 10 simultaneously twice-6, it is greatly improved reliability so repeatedly sending, it is this
Mode is substantially to have brought reliability with data bandwidth.
Broadcasting packet field, shown in Fig. 2, the time slot configuration information including message attribute and each node；Message attribute includes
Message length LEN, sequence number SEQ, time calibration information (offset), polling cycle (duration), the time slot of each node is matched
Confidence breath includes node ID number (Node ID), time slot allocation information, slot time section.
S2, network sensor node receive any one subsynchronous head, obtain time calibration information, and time calibration information includes
Starting broadcast markers and time offset (host node Time Delay of Systems), each network sensor node is according to time calibration information
The time offset for being each based on the starting broadcast of this period is calculated, school is carried out to respective sample clock generator using time offset
Right, all-network sensor node is broadcasted using one, therefore can be fully synchronized, ensure that the sampling beat of all nodes is same
Step, can be with effective solution due to the asynchronous problem of time drift equal error bring data.According to time offset, so that it may
Know specific time of each sampled point within the period, according to the length of polling cycle, can determine and be based on starting to query the time
The overall offset time, each data of whole network have thus been uniquely determined from host node obtains the time, realizes
The whole network is synchronous.
Each network sensor node calculates respective according to network sensor sequence node number (SEQ), time calibration information
Time offset, by initial time and time offset, the actual samples data for obtaining each sensor obtain the moment, than
If sample offset is 25.625 seconds, starting query time is 12:40:10.125 on May 14th, 2019, then can calculate data
Sampling instant is 12:40:35.75 on May 14th, 2019.
S3, network sensor node receive any one subsynchronous head, obtain polling cycle and sampling multiplying power, according to inquiry week
Phase and respective sampling multiplying power determine or update respective sampling rate, set sampling interval in this period and sampled point time, sternly
Lattice are synchronous with broadcast cycle, so that the data of each periodic report of consolidated network sensor node are isometric, it can be achieved that fixed length packet point
Group exchange, reduces the processing complexity of datagram, improves treatment effeciency.
Sample the determination method of multiplying power: with the greatest common divisor of all-network sensor node corresponding data source sampling rate
As the network samples period, each network sensor node configures the sampling of the data source according to the data source sampling rate of oneself
Multiplying power.The sampling rate of network sensor node is generally limited by sensor itself, such as the response speed of filters internal, mould
Number converter speed etc., such as the maximum sample rate 40Hz of sensor 1, the maximum sample rate 60Hz of sensor 2, then network is adopted
The sample period can only be 20Hz or smaller, select greatest common divisor 20Hz that can guarantee real-time to the greatest extent, sample simultaneously
Multiplying power divides exactly, and synchronous accuracy and precision can be improved.
S4, network sensor node receive any one subsynchronous head, obtain time slot allocation information, will be sent last time
Sampled data between this time slot initial time is ready to, and is put in buffer；Network sensor node is in respective time slot
In period (timeslot length), the sampled data of caching is packaged by sample time order, and be sent to host section
Point；
S5, host node receives the data frame of all-network sensor node, by network sensor sequence node to data
Frame is packaged, and is enclosed the timestamp of corresponding network sensor node acquisition data, is sent to comprehensive control machine or telemetry system.
In the above process, the communication logic process of host node, as shown in figure 3, default node, time slot configuration, read net
Network configuration, judges whether the new period starts, if starting the new period, is packaged and exports a upper cycle data, constructs broadcasting packet weight
N times are sent in recurrence；If not starting the new period, receive, returned data report.
The communication logic process of network sensor node receives same as shown in figure 4, waiting host broadcast sync message
After walking message, update sampling period, beat (referring to sampling interval and sampled point time), communication window (are network sensor nodes
Collected data are reported to the time window of host node, are used for reported data)；According to updated sampling period, section
It claps and carries out this periodic sampling, periodic sampling is data cached in packing, and transmission is packaged data cached after communication window reaches, and judgement is logical
Whether letter window terminates, if communication window is not finished, checks whether and sends successfully, if communication window terminates, suspend mode to week
Sync message next time is waited after phase.
The present invention carries time calibration information, polling cycle and node slot time using broadcast header and distributes information.Sampling
Period is the period of network sensor node oneself acquisition environmental physics amount, and polling cycle refers to network sensor node number
According to the period reported, polling cycle is exactly to sample multiplying power divided by the sampling period.Since sampling rate is by polling cycle and sampling
Multiplying power determines that each broadcasting packet all contains this polling cycle length, the sampling magnification information of each node, i.e. broadcast packet
Carry rate information；Therefore when the broadcasted content in (n+1)th period is consistent with n-th of period, network samples and communications status are not
Become, when the broadcasted content in (n+1)th period changes, the sampling rate of network sensor node can change, to realize energy
Dynamically change sampling rate as unit of the period, system is facilitated flexibly to deploy resource, such as the vibration monitor system of host system
It detects exception, dynamically adjusts the temperature sampling frequency of each equipment, it can be real by configuring the Broadcasting Datagram of host node
It is existing, such as shorten polling cycle, sampling rate increases；In concrete application, sensing system in typical case such as arrow, sample rate is reachable
40KHz, typical TD system are not competed according to time reported data, can not handle burst or emergency data.
Network sensor sequence node table includes that this inquires the ID number of the network sensor node of selection, the network of selection
Sensor node number is K, and K≤N, N represent network sensor node total number.Network sensor number of nodes and data communication window
Configuration change, then the topology of network can also change, and can be realized being dynamically added and exiting for node；In practical applications,
If there is several state phases, the communication window of each state phase configures difference, and host node needs to switch, such as samples
Multiplying power increases, then the data volume for sampling acquisition will increase；But in the same state phase, sampling multiplying power is constant, identical to match
The datagram for setting lower each periodic report is isometric, guarantees the transmission of fixed length packet.
All time slot allocations, sampling configuration (period, frequency, precision for sampling etc.) and node enter and leave network operation
Different broadcast datas can be configured by host node offers realization；Separate configurations host section can be passed through in practical applications
The mode of point changes network parameter, such as sensor is distributed in each place using battery power supply, by calculating with data receiver
The connected host node of machine can configure whole network, and not have to disassembling sensor node, without giving sensor section
Point wiring, easily can be debugged and be configured, realize the light-weight design of network sensor node.
JWSN (wireless sensor network on arrow) series wireless network data transmission process, as shown in figure 5, markers, that is, rise
Begin broadcast markers；In order to solve the problems, such as that data source asynchronous speed bring message length is uncertain, invention introduces samplings
The concept of multiplying power takes the greatest common divisor of all data source data rates as the network samples period, then according to each data
The data rate in source configures the sampling multiplying power of the data source.During host broadcast, each network sensor node is according to looking into
Period, sampling multiplying power are ask, sampling interval in this period and sampled point time are reset, so that the sampling period is stringent and polling cycle
Synchronous, the data for guaranteeing that network sensor node each polling cycle reports are isometric, reduce the processing complexity of datagram.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the scope of the present invention.It is all
Any modification, equivalent replacement, improvement and so within the spirit and principles in the present invention, are all contained in protection scope of the present invention
It is interior.
Claims (9)
1. a kind of collection method for wireless sensor network data based on broadcast synchronization, which is characterized in that specifically according to following step
It is rapid to carry out:
S1, for host node to all-network sensor node broadcasts synchronous head, synchronous head includes time calibration information, network sensing
Device sequence node table, polling cycle, all-network sensor node sampling multiplying power and time slot allocation information；
S2, network sensor node calculate the time offset for being each based on the starting broadcast of this period according to time calibration information,
Respective sample clock generator is proofreaded using time offset；
S3, network sensor node determine or update respective sampling rate according to polling cycle and respective sampling multiplying power；
Sampled data is packaged and with datagram by S4, network sensor node according to time slot allocation information by sample time order
Form be sent to host node；
S5, host node reappear the data of each network sensor node, are sent to from the content of each datagram of protocol analysis
Comprehensive control machine or telemetry system.
2. a kind of collection method for wireless sensor network data based on broadcast synchronization according to claim 1, feature
It is, in the step S1, samples the determination method of multiplying power: with all-network sensor node corresponding data source sampling rate
Greatest common divisor configures the number according to the data source sampling rate of oneself as network samples period, each network sensor node
According to the sampling multiplying power in source.
3. a kind of collection method for wireless sensor network data based on broadcast synchronization according to claim 1, feature
It is, in the step S1, network sensor sequence node table includes that this inquires the network sensor node ID number of selection, is selected
The network sensor number of nodes selected is K, and K≤N, N represent network sensor node total number.
4. a kind of collection method for wireless sensor network data based on broadcast synchronization according to claim 1, feature
It is, in the step S1, broadcasting packet field includes the time slot configuration information of message attribute and each node；Message attribute includes
Message length, sequence number, time calibration information, polling cycle, the time slot configuration information of each node include network sensor node
ID number, time slot allocation information, slot time section.
5. a kind of collection method for wireless sensor network data based on broadcast synchronization according to claim 1, feature
It is, in the step S1, host node is repeated as many times continuous broadcast synchronization head to all-network sensor node.
6. a kind of collection method for wireless sensor network data based on broadcast synchronization according to claim 1, feature
It is, in the step S1, network internal uses TD mode, multiple network sensor node timesharing shared data bandwidth.
7. a kind of collection method for wireless sensor network data based on broadcast synchronization according to claim 1, feature
It is, the step S4 further includes error correction and retransmission feedback mechanism, but must be completed in distribution time slot；Data communication window knot
Beam is all forced into standby mode regardless of whether working, concedes channel.
8. a kind of collection method for wireless sensor network data based on broadcast synchronization according to claim 1, feature
It is, in the step S5, reappears the data of each network sensor node, specifically: host node receives all-network and passes
The data frame of sensor node is packaged data frame by network sensor sequence node table, encloses corresponding network sensor node and adopt
Collect the timestamp of data.
9. a kind of wireless sensor network data acquisition system based on broadcast synchronization, which is characterized in that using such as claim
A kind of any one of 1-8 collection method for wireless sensor network data based on broadcast synchronization, comprising:
Host node, for all-network sensor node broadcasts synchronous head, synchronous head to include time calibration information, network biography
Sensor node sequence table, polling cycle, all-network sensor node sampling multiplying power and time slot allocation information；Simultaneously from agreement
The content for parsing each datagram reappears the data of each network sensor node, is sent to comprehensive control machine or telemetry system；
Network sensor node is each based on the starting broadcast of this period according to time calibration information calculating for receiving synchronous head
Time offset, respective sample clock generator is proofreaded using time offset；According to polling cycle and respective adopt
Sample multiplying power determines or updates respective sampling rate；Sampled data is packaged by sample time order according to time slot allocation information
And host node is sent in the form of datagram.
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| CN111954165A (en) * | 2020-08-12 | 2020-11-17 | 深圳蓝奥声科技有限公司 | Wireless synchronous data transmission method and device |
| CN112714454A (en) * | 2019-10-25 | 2021-04-27 | 中国科学院深圳先进技术研究院 | Monitoring method of wireless sensor network and related equipment |
| CN112821921A (en) * | 2020-12-25 | 2021-05-18 | 青岛鼎信通讯股份有限公司 | Multi-node data packet transmission method based on power line carrier communication technology |
| CN115038161A (en) * | 2022-07-25 | 2022-09-09 | 苏州德姆斯信息技术有限公司 | Vibration data wireless synchronous acquisition method and system and vibration monitoring system |
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