CN106851686A - Realization method and system with time bias data collection radio MAC protocol - Google Patents
Realization method and system with time bias data collection radio MAC protocol Download PDFInfo
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- CN106851686A CN106851686A CN201710053369.2A CN201710053369A CN106851686A CN 106851686 A CN106851686 A CN 106851686A CN 201710053369 A CN201710053369 A CN 201710053369A CN 106851686 A CN106851686 A CN 106851686A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/08—Testing, supervising or monitoring using real traffic
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
- H04W80/02—Data link layer protocols
Abstract
The invention provides a kind of realization method and system with time bias data collection radio MAC protocol, it is related to communication protocol techniques field, by gathering the first data message, and data delay information is obtained according to the first data message, time mark is carried out to the data frame of the first data message according to data delay information, obtain trailer information, temporal information is obtained by gps system, and data acquisition time information is calculated according to temporal information and trailer information, data acquisition time information is packed with the first data message, obtain the second data message, and the second data message is sent to data service center.The present invention can improve the time accuracy of sensing node gathered data.
Description
Technical field
The present invention relates to communication protocol techniques field, more particularly, to time bias data collection radio MAC protocol
Realization method and system.
Background technology
Internet of Things is new industry, and sensor is the basis of Internet of Things, and it is most basic that wireless network sensor is even more Internet of Things
Industry, its technical merit simultaneously be also influence Internet of Things application popularization key factor.Wireless sensor network includes sensing
Node and network trunk.Sensing node is exactly network sensor, and it is responsible for collection, treatment and the transmission of data.Network trunk is born
Duty collects the data of sensing node, then transmits to data service center.Sensing node collection data it is necessary to have when
Between, the data for otherwise gathering are meaningless.General way is：GPS (Global Positioning are filled on sensing node
System, global positioning system), obtain the time from GPS.In addition, being sent to network trunk after sensing node gathered data, do not have
There is the time for indicating data acquisition, the data that network trunk will be received are sent to data service center with the current time of oneself.
If acquisition time is long, or network blockage occurs, then so the data of collection just have very big time delay, so that
Data lose meaning or even produce serious consequence.
The content of the invention
In view of this, it is an object of the invention to provide a kind of realization with time bias data collection radio MAC protocol
Method and system, to improve the time accuracy of sensing node gathered data.
In a first aspect, the embodiment of the invention provides a kind of realization side with time bias data collection radio MAC protocol
Method, wherein, methods described includes：
The first data message is gathered, and data delay information is obtained according to first data message；
Time mark is carried out to the data frame of first data message according to the data delay information, postamble letter is obtained
Breath；
Temporal information is obtained by global position system GPS, and is calculated with the trailer information according to the temporal information
Obtain data acquisition time information；
The data acquisition time information is packed with first data message, the second data message is obtained, and
Second data message is sent to data service center.
With reference in a first aspect, the embodiment of the invention provides the first possible implementation method of first aspect, wherein, institute
Stating method also includes：
Judge whether first data message is correct；
If first data message is correct, generation confirms packet, and the confirmation packet is fed back into sensing
Device node, and feedback delay information is obtained according to the confirmation packet.
With reference to the first possible implementation method of first aspect, second of first aspect is the embodiment of the invention provides
Possible implementation method, wherein, first data message includes the first data frame length, described to be believed according to first data
Breath obtains data delay information to be included：
The 3rd data message is obtained, and parameter and feedback delay letter are calculated according to the 3rd data message
Breath；
According to the parameter and first data frame length, the first Delay is obtained；
Obtain first and send and confirm Delay, and combine first Delay and the feedback delay information, meter
Calculation obtains the second Delay；
According to first Delay and second Delay, the data delay information is obtained.
With reference to second possible implementation method of first aspect, the third of first aspect is the embodiment of the invention provides
Possible implementation method, wherein, the 3rd data message includes the second data frame length and the 3rd data frame length, described
Being calculated parameter and the feedback delay information according to the 3rd data message includes：
Second data frame length is obtained by the first debugging, and measures the second transmission and confirm Delay；
3rd data frame length is obtained by the second debugging, and measures the 3rd transmission and confirm Delay；
According to second data frame length, the 3rd data frame length, it is described second send confirm Delay and
Described 3rd sends confirmation Delay, is calculated the parameter and the feedback delay information.
With reference to second possible implementation method of first aspect, the 4th kind of first aspect is the embodiment of the invention provides
Possible implementation method, wherein, it is described when obtaining the data according to first Delay and second Delay
The information of prolonging includes：
Carried out calculating the data delay information according to following formula：
T=aX+m
Wherein, the T is the data delay information, and a is first data frame length, and the X is the ginseng
Number, the m is second Delay.
Second aspect, the embodiment of the present invention also provides a kind of realization system with time bias data collection radio MAC protocol
System, wherein, including：
Data delay acquiring unit, for gathering the first data message, and obtains data according to first data message
Delay；
Indexing unit, for carrying out time mark to the data frame of first data message according to the data delay information
Note, obtains trailer information；
Data acquisition time acquiring unit, for by GPS obtain temporal information, and according to the temporal information with it is described
Trailer information is calculated data acquisition time information；
Transmitting element, for the data acquisition time information to be packed with first data message, obtains
Two data messages, and second data message is sent to data service center.
With reference to second aspect, the first possible implementation method of second aspect is the embodiment of the invention provides, wherein, also
Including：
Ruling unit, for judging whether first data message is correct, in the correct feelings of the first data message
Under condition, generation confirms packet, the confirmation packet is fed back into sensor node, and obtain according to the confirmation packet
Feedback delay information.
With reference to the first possible implementation method of second aspect, second of second aspect is the embodiment of the invention provides
Possible implementation method, wherein, first data message includes the first data frame length, and the data delay acquiring unit is also
For：
The 3rd data message is obtained, and parameter and feedback delay letter are calculated according to the 3rd data message
Breath；
According to the parameter and first data frame length, the first Delay is obtained；
Obtain first and send and confirm Delay, and combine first Delay and the feedback delay information, meter
Calculation obtains the second Delay；
According to first Delay and second Delay, the data delay information is obtained.
With reference to second possible implementation method of second aspect, the third of second aspect is the embodiment of the invention provides
Possible implementation method, wherein, the 3rd data message includes the second data frame length and the 3rd data frame length, described
Being calculated parameter and the feedback delay information according to the 3rd data message includes：
Second data frame length is obtained by the first debugging, and measures the second transmission and confirm Delay；
3rd data frame length is obtained by the second debugging, and measures the 3rd transmission and confirm Delay；
According to second data frame length, the 3rd data frame length, it is described second send confirm Delay and
Described 3rd sends confirmation Delay, is calculated the parameter and the feedback delay information.
With reference to second possible implementation method of second aspect, the 4th kind of second aspect is the embodiment of the invention provides
Possible implementation method, wherein, it is described when obtaining the data according to first Delay and second Delay
The information of prolonging includes：
Carried out calculating the data delay information according to following formula：
T=aX+m
Wherein, the T is the data delay information, and a is first data frame length, and the X is the ginseng
Number, the m is second Delay.
The realization side of wireless MAC (Multiple Access Control, multiple access control) agreement that the present invention is provided
Method and system, by gathering the first data message, and obtain data delay information, according to data delay according to the first data message
Information carries out time mark to the data frame of the first data message, trailer information is obtained, when being obtained by global position system GPS
Between information, and data acquisition time information is calculated according to temporal information and trailer information, by data acquisition time information with
First data message is packed, and obtains the second data message, and the second data message is sent into data service center.This hair
The bright time accuracy that can improve sensing node gathered data.
Other features and advantages of the present invention will be illustrated in the following description, also, the partly change from specification
Obtain it is clear that or being understood by implementing the present invention.The purpose of the present invention and other advantages are in specification, claims
And specifically noted structure is realized and obtained in accompanying drawing.
To enable the above objects, features and advantages of the present invention to become apparent, preferred embodiment cited below particularly, and coordinate
Appended accompanying drawing, is described in detail below.
Brief description of the drawings
In order to illustrate more clearly of the specific embodiment of the invention or technical scheme of the prior art, below will be to specific
The accompanying drawing to be used needed for implementation method or description of the prior art is briefly described, it should be apparent that, in describing below
Accompanying drawing is some embodiments of the present invention, for those of ordinary skill in the art, before creative work is not paid
Put, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of implementation method with time bias data collection radio MAC protocol that the embodiment of the present invention one is provided
Flow chart；
Fig. 2 is another realization side with time bias data collection radio MAC protocol that the embodiment of the present invention one is provided
Method flow chart；
Fig. 3 is the data delay information obtaining method flow chart that the embodiment of the present invention one is provided；
Fig. 4 is the flow chart of step S310 in the data delay information obtaining method that the embodiment of the present invention one is provided；
Fig. 5 is that a kind of of the offer of the embodiment of the present invention two realizes system with time bias data collection radio MAC protocol
Schematic diagram；
Fig. 6 is the wireless sensor network structural representation that the embodiment of the present invention two is provided.
Icon：
100- data delay acquiring units；200- indexing units；300- data acquisition time acquiring units；400- sends single
Unit.
Specific embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with accompanying drawing to the present invention
Technical scheme be clearly and completely described, it is clear that described embodiment is a part of embodiment of the invention, rather than
Whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not making creative work premise
Lower obtained every other embodiment, belongs to the scope of protection of the invention.
Wireless sensor network includes sensing node and network trunk.Sensing node is responsible for collection, treatment and the biography of data
Defeated, network trunk is responsible for collecting the data of sensing node, then transmits to data service center, and data service center is responsible for
Receive the data that send over of network trunk and stored, analyzed, be presented to user.In the mistake that data are acquired, transmit
, if acquisition time is long, or there is network blockage, then so the data of collection just have very big time delay in Cheng Zhong,
Data are made to lose meaning or even produce serious consequence.
Based on this, the implementation method with time bias data collection radio MAC protocol provided in an embodiment of the present invention and it is
System, can improve the time accuracy of sensing node gathered data.
For ease of understanding the present embodiment, first to the band time bias data acquisition disclosed in the embodiment of the present invention
The implementation method of wireless MAC protocols describes in detail.
Embodiment one：
Fig. 1 is a kind of implementation method with time bias data collection radio MAC protocol that the embodiment of the present invention one is provided
Flow chart.
Reference picture 1, the implementation method with time bias data collection radio MAC protocol comprises the following steps：
Step S110, gathers the first data message, and obtain data delay information according to the first data message；
Step S120, time mark is carried out according to data delay information to the data frame of the first data message, obtains postamble
Information；
Step S130, obtains temporal information, and be calculated data according to temporal information and trailer information by gps system
Acquisition time information；
Step S140, data acquisition time information is packed with the first data message, obtains the second data message, and
Second data message is sent to data service center.
Specifically, since sensing node gather the first data message received successfully to network trunk, between this period
Referred to as data delay.More specifically, data delay includes collection time delay, transmission delay, propagation delay, processing delay.Number
It is collection time delay, transmission delay, propagation delay and processing delay sum according to time delay.Wherein, collection time delay refers to since data
Data are collected to start to send；Transmission delay refers to that data is activation completion is sent to since data；Propagation delay refers to from biography
Sense node sends data and starts to network trunk to receive data, in the propagation rate of free space is the light velocity due to electromagnetic wave, because
This can ignore propagation delay；Processing delay refer to from receiving data to making the award, including data unpack, data decoding,
CRC check etc..
Transmission delay is the number related with data frame length to processing delay, using transmission delay and processing delay as first
Delay.Assuming that the data frame length of the first data message is a, then the first Delay is exactly aX, wherein X is unknown ginseng
Number.Collection time delay is set to m as the second Delay, and m is unknown constant.
Fig. 2 is another realization side with time bias data collection radio MAC protocol that the embodiment of the present invention one is provided
Method flow chart.
Reference picture 2, the implementation method with time bias data collection radio MAC protocol also comprises the following steps：
Step S210, judges whether the first data message is correct, if the first data message is correct, performs step
S221；If the first data message is incorrect, step S222 and step S230 is performed；
Step S221, generation confirms packet, will confirm that packet feeds back to sensor node, and according to confirmation packet
Obtain feedback delay information；
Step S222；First data message is abandoned；
Step S230, the first data message is resend.
Specifically, network trunk carries out ruling to the first data message, and in the case of the first data message is correct, one
First data message is sent to data server by aspect, on the other hand feeds back a confirmation packet to sensing node；From net
Network relaying is made a ruling to sensing node to receive and confirms that packet is set to n this period, confirms that packet is regular length,
N is the unknown constant relevant with packet is confirmed.
In the case of the first data message mistake, network trunk abandons the first data message, and sensing node is certain
The confirmation packet of feedback is not received in time, just automatically the first data message is resend to network trunk, in network
Judge again after the first data message to resending.
Exemplary embodiment of the invention, the first data message include the first data frame length, reference picture 3, according to
First data message obtains data delay information and comprises the following steps：
Step S310, obtains the 3rd data message, and be calculated parameter, and feedback delay letter according to the 3rd data message
Breath；
Specifically, the 3rd data message includes the second data frame length and the 3rd data frame length, reference picture 4, this step
Especially by step S410 --- S430 is realized：
Step S410, obtains the second data frame length, and measure the second transmission confirmation Delay by the first debugging；
Step S420, obtains the 3rd data frame length, and measure the 3rd transmission confirmation Delay by the second debugging；
Step S430, sends according to the second data frame length, the 3rd data frame length, second and confirms Delay and the 3rd
Send and confirm Delay, be calculated parameter and feedback delay information.
Wherein, define since sensing node gathered data, to the confirmation packet of network trunk transmission is received,
This period confirms time delay to send, and adopting K when sending confirmation represents.
By debugging, sensing node only sends data not gathered data, carries out manual amendment to the 3rd data message, and set
It is set to the second data frame length b；Start timer timing, Zhi Daoshou while sensing node starts to send three data messages
To network trunk feedback data validation bag when stop timing, by check timer calculate the second transmission confirm time delay K2,
There is formula (1)：
BX+n=K2 (1)
Equally, by debugging, sensing node only sends data not gathered data, the 3rd data message is manually repaiied
When changing, and being arranged to the 3rd data frame length c, there is formula (2)：
CX+n=K3 (2)
Wherein, K3 is that the 3rd transmission confirms time delay.
Parameter X and feedback delay n can be calculated according to formula (1) and formula (2).
Step S320, according to parameter and the first data frame length, obtains the first Delay；
Datum specifically, the first data frame length is a, the first Delay be transmission delay and processing delay it
Be aX.
Step S330, obtains first and sends confirmation Delay, and combines the first Delay and feedback delay information, meter
Calculation obtains the second Delay；
Specifically, in sensing node gathered data, thering is the first transmission to confirm time delay K1, such as shown in formula (3)：
M+aX+n=K1 (3)
The first transmission that can be checked in formula (3) by timer timing confirms Delay K1, then by parameter X and feedback
Time delay n is brought into formula (3), can be calculated collection time delay m, and the second Delay is collection time delay.
Step S340, according to the first Delay and the second Delay, obtains data delay information.
Specifically, due to having ignored propagation delay, therefore data delay information only includes the first Delay and the second time delay
Information, such as formula (4) are represented：
T=aX+m (4)
Wherein, T is data delay information, and aX is the first Delay, i.e. transmission delay and processing delay sum, and m is to adopt
Collection time delay.
When sensing network has gathered the first data message and to send, data delay information T is write the number of data frame
It is marked according to position end, obtains trailer information, when network trunk receives the first data message, is parsed according to trailer information
Data delay information is obtained, and combination calculates specific data acquisition time information self by the temporal information that GPS is obtained,
Illustrate：Assuming that temporal information is 15:30, data delay information be 15 minutes, then data acquisition time information be by when
Between information 15:30 push away forward 15 minutes, are 15:15.Data acquisition time information is packed with the first data message, is obtained
Second data message, and the second data message is sent to data service center.
The implementation method with time bias data collection radio MAC protocol that the present invention is provided, by gathering the first data
Information, and data delay information is obtained according to the first data message, according to data delay information to the data of the first data message
Frame carries out time mark, obtains trailer information, by global position system GPS obtain temporal information, and according to temporal information with
Trailer information is calculated data acquisition time information, and data acquisition time information is packed with the first data message, obtains
To the second data message, and the second data message is sent to data service center.The present invention can improve sensing node collection
The time accuracy of data.
Embodiment two：
Fig. 5 is that a kind of of the offer of the embodiment of the present invention two realizes system with time bias data collection radio MAC protocol
Schematic diagram.
Reference picture 5, realizes that system includes with time bias data collection radio MAC protocol：
Data delay acquiring unit 100, for gathering the first data message, and when obtaining data according to the first data message
Prolong information；
Indexing unit 200, for carrying out time mark to the data frame of the first data message according to data delay information, obtains
To trailer information；
Data acquisition time acquiring unit 300, for obtaining temporal information by GPS, and according to temporal information and postamble
Information is calculated data acquisition time information；
Transmitting element 400, for data acquisition time information to be packed with the first data message, obtains the second data
Information, and the second data message is sent to data service center.
Exemplary embodiment of the invention, realizes that system is also wrapped with time bias data collection radio MAC protocol
Include：
Ruling unit, for judging whether the first data message is correct, in the case of the first data message is correct, generation
Confirm packet, will confirm that packet feeds back to sensor node, and feedback delay information is obtained according to confirmation packet.
Exemplary embodiment of the invention, the first data message includes the first data frame length, and data delay is obtained
Unit 100 is additionally operable to：
The 3rd data message is obtained, and parameter and feedback delay information are calculated according to the 3rd data message；
According to parameter and the first data frame length, the first Delay is obtained；
Obtain first and send and confirm Delay, and combine the first Delay and feedback delay information, be calculated the
Two Delays；
According to the first Delay and the second Delay, data delay information is obtained.
Exemplary embodiment of the invention, the 3rd data message includes the second data frame length and the 3rd data frame length
Degree, being calculated parameter and feedback delay information according to the 3rd data message includes：
Second data frame length is obtained by the first debugging, and measures the second transmission and confirm Delay；
3rd data frame length is obtained by the second debugging, and measures the 3rd transmission and confirm Delay；
Sent according to the second data frame length, the 3rd data frame length, second and confirm that Delay and the 3rd sends confirmation
Delay, is calculated parameter and feedback delay information.
Fig. 6 is the wireless sensor network structural representation that the embodiment of the present invention two is provided.
Reference picture 6, wireless sensor network includes sensing node, network trunk and data service center.Sensing node point
Than wide, than larger, it is responsible for the collection of data, treatment and transmits area coverage cloth；Network trunk is responsible for collecting sensing section
The data of point, data are transmitted to data service center；Data service center is responsible for data and is stored, analyzes,
It is presented to user.
In addition, data frame format involved in the present invention is 802.11MAC data frame formats.
What the present invention was provided realizes system with time bias data collection radio MAC protocol, by gathering the first data
Information, and data delay information is obtained according to the first data message, according to data delay information to the data of the first data message
Frame carries out time mark, obtains trailer information, by global position system GPS obtain temporal information, and according to temporal information with
Trailer information is calculated data acquisition time information, and data acquisition time information is packed with the first data message, obtains
To the second data message, and the second data message is sent to data service center.The present invention can improve sensing node collection
The time accuracy of data.
The meter of the realization method and system with time bias data collection radio MAC protocol that the embodiment of the present invention is provided
Calculation machine program product, including the computer-readable recording medium of program code is stored, the instruction that described program code includes can
For performing the method described in previous methods embodiment, implement and can be found in embodiment of the method, will not be repeated here.
It is apparent to those skilled in the art that, for convenience and simplicity of description, the system of foregoing description
With the specific work process of device, the corresponding process in preceding method embodiment is may be referred to, will not be repeated here.
In addition, in the description of the embodiment of the present invention, unless otherwise clearly defined and limited, term " installation ", " phase
Company ", " connection " should be interpreted broadly, for example, it may be being fixedly connected, or being detachably connected, or be integrally connected；Can
Being to mechanically connect, or electrically connect；Can be joined directly together, it is also possible to be indirectly connected to by intermediary, Ke Yishi
Two connections of element internal.For the ordinary skill in the art, with concrete condition above-mentioned term can be understood at this
Concrete meaning in invention.
If the function is to realize in the form of SFU software functional unit and as independent production marketing or when using, can be with
Storage is in a computer read/write memory medium.Based on such understanding, technical scheme is substantially in other words
The part contributed to prior art or the part of the technical scheme can be embodied in the form of software product, the meter
Calculation machine software product is stored in a storage medium, including some instructions are used to so that a computer equipment (can be individual
People's computer, server, or network equipment etc.) perform all or part of step of each embodiment methods described of the invention.
And foregoing storage medium includes：USB flash disk, mobile hard disk, read-only storage (ROM, Read-Only Memory), arbitrary access are deposited
Reservoir (RAM, Random Access Memory), magnetic disc or CD etc. are various can be with the medium of store program codes.
In the description of the invention, it is necessary to explanation, term " " center ", " on ", D score, "left", "right", " vertical ",
The orientation or position relationship of the instruction such as " level ", " interior ", " outward " be based on orientation shown in the drawings or position relationship, merely to
Be easy to the description present invention and simplify describe, rather than indicate imply signified device or element must have specific orientation,
With specific azimuth configuration and operation, therefore it is not considered as limiting the invention.Additionally, term " first ", " second ",
" the 3rd " is only used for describing purpose, and it is not intended that indicating or implying relative importance.
Finally it should be noted that：Embodiment described above, specific embodiment only of the invention, is used to illustrate the present invention
Technical scheme, rather than its limitations, protection scope of the present invention is not limited thereto, although with reference to the foregoing embodiments to this hair
It is bright to be described in detail, it will be understood by those within the art that：Any one skilled in the art
The invention discloses technical scope in, it can still modify to the technical scheme described in previous embodiment or can be light
Change is readily conceivable that, or equivalent is carried out to which part technical characteristic；And these modifications, change or replacement, do not make
The essence of appropriate technical solution departs from the spirit and scope of embodiment of the present invention technical scheme, should all cover in protection of the invention
Within the scope of.Therefore, protection scope of the present invention described should be defined by scope of the claims.
Claims (10)
1. a kind of implementation method with time bias data collection radio MAC protocol, it is characterised in that methods described includes：
The first data message is gathered, and data delay information is obtained according to first data message；
Time mark is carried out to the data frame of first data message according to the data delay information, trailer information is obtained；
Temporal information is obtained by global position system GPS, and is calculated with the trailer information according to the temporal information
Data acquisition time information；
The data acquisition time information is packed with first data message, the second data message is obtained, and by institute
State the second data message and be sent to data service center.
2. the implementation method with time bias data collection radio MAC protocol according to claim 1, it is characterised in that
Methods described also includes：
Judge whether first data message is correct；
If first data message is correct, generation confirms packet, and the confirmation packet is fed back into sensor section
Point, and feedback delay information is obtained according to the confirmation packet.
3. the implementation method with time bias data collection radio MAC protocol according to claim 2, it is characterised in that
First data message includes the first data frame length, described to obtain data delay packet according to first data message
Include：
The 3rd data message is obtained, and parameter and the feedback delay information are calculated according to the 3rd data message；
According to the parameter and first data frame length, the first Delay is obtained；
Obtain first and send and confirm Delay, and combine first Delay and the feedback delay information, calculate
To the second Delay；
According to first Delay and second Delay, the data delay information is obtained.
4. the implementation method with time bias data collection radio MAC protocol according to claim 3, it is characterised in that
3rd data message includes the second data frame length and the 3rd data frame length, described according to the 3rd data message meter
Calculation obtains parameter and the feedback delay information to be included：
Second data frame length is obtained by the first debugging, and measures the second transmission and confirm Delay；
3rd data frame length is obtained by the second debugging, and measures the 3rd transmission and confirm Delay；
Sent according to second data frame length, the 3rd data frame length, described second and confirm Delay and described
3rd sends confirmation Delay, is calculated the parameter and the feedback delay information.
5. the implementation method with time bias data collection radio MAC protocol according to claim 3, it is characterised in that
It is described the data delay information is obtained according to first Delay and second Delay to include：
Carried out calculating the data delay information according to following formula：
T=aX+m
Wherein, the T is the data delay information, and a is first data frame length, and the X is the parameter, institute
M is stated for second Delay.
6. it is a kind of to realize system with time bias data collection radio MAC protocol, it is characterised in that including：
Data delay acquiring unit, for gathering the first data message, and obtains data delay according to first data message
Information；
Indexing unit, for carrying out time mark to the data frame of first data message according to the data delay information,
Obtain trailer information；
Data acquisition time acquiring unit, for obtaining temporal information by GPS, and according to the temporal information and the postamble
Information is calculated data acquisition time information；
Transmitting element, for the data acquisition time information to be packed with first data message, obtains the second number
It is believed that breath, and second data message is sent to data service center.
It is 7. according to claim 6 to realize system with time bias data collection radio MAC protocol, it is characterised in that
Also include：
Ruling unit, for judging whether first data message is correct, in the case of first data message is correct,
Generation confirms packet, the confirmation packet is fed back into sensor node, and fed back according to the confirmation packet
Delay.
It is 8. according to claim 7 to realize system with time bias data collection radio MAC protocol, it is characterised in that
First data message includes the first data frame length, and the data delay acquiring unit is additionally operable to：
The 3rd data message is obtained, and parameter and the feedback delay information are calculated according to the 3rd data message；
According to the parameter and first data frame length, the first Delay is obtained；
Obtain first and send and confirm Delay, and combine first Delay and the feedback delay information, calculate
To the second Delay；
According to first Delay and second Delay, the data delay information is obtained.
It is 9. according to claim 8 to realize system with time bias data collection radio MAC protocol, it is characterised in that
3rd data message includes the second data frame length and the 3rd data frame length, described according to the 3rd data message meter
Calculation obtains parameter and the feedback delay information to be included：
Second data frame length is obtained by the first debugging, and measures the second transmission and confirm Delay；
3rd data frame length is obtained by the second debugging, and measures the 3rd transmission and confirm Delay；
Sent according to second data frame length, the 3rd data frame length, described second and confirm Delay and described
3rd sends confirmation Delay, is calculated the parameter and the feedback delay information.
It is 10. according to claim 8 to realize system with time bias data collection radio MAC protocol, it is characterised in that
It is described the data delay information is obtained according to first Delay and second Delay to include：
Carried out calculating the data delay information according to following formula：
T=aX+m
Wherein, the T is the data delay information, and a is first data frame length, and the X is the parameter, institute
M is stated for second Delay.
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