CN104092753B - Internet of Things information processing and fusion method and its system based on wireless relay system - Google Patents
Internet of Things information processing and fusion method and its system based on wireless relay system Download PDFInfo
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Abstract
Internet of Things information processing and Fusion Model based on wireless relay system, it includes physical layer, transport layer, collaboration process layer and application layer, the physical layer is provided with sensing layer and user's control subsystem for perceiving physical environment, it also includes wireless relay system, the wireless relay system is located at sensing layer to the centre of transport layer, the logic unit that the wireless relay system includes has wireless data physical layer processing unit, sensor data acquisition converting unit, information fusion unit, wireless data is encoded, decoding, encapsulation unit, synchronizing information processing unit, information exchange unit.Its biggest advantage be wireless relay system as Internet of Things sensing layer and heterogeneous wireless communication networks between access gateway, it is easy to multi-level Fusion, astride hierarchy fusion and the depth integration of information, selectively parses the information from physical layer to transport layer and for cooperateing with treatment or control and decision-making.
Description
Technical field
The present invention relates to the technical field of Internet of Things information processing, refer in particular to the Internet of Things based on wireless relay system and believe
Breath treatment and fusion method and its model.
Background technology
It is support with core technologies such as wireless sensor networks, Internet of Things organically merges physical world with the logic world
It is integrated, drastically increases the operating efficiency of people, reduces cooperation cost, the various fields in real life suffers from ten
Point important effect, existing Internet of Things pessimistic concurrency control be usually the perception information that sensing layer will be obtained and by access network handle centre or
Final process result is linked into transport layer, and during Internet of Things information processing and fusion, it is desirable to other levels can be participated in
Collaboration treatment is coordinated, and the fusion PCR of current Internet of Things information is not enough, and astride hierarchy fusion faculty is inadequate, simultaneously as
Thing network sensing layer is made up of wireless senser, and the calculating of its node, communication, storage capacity are limited, it is impossible to directly use frequency hopping
Traditional security mechanism such as communication, public key cryptography, in a network environment, the attack from external network exacerbates the peace of sensing layer
Full problem, Internet of Things uses heterogeneous network of future generation as core bearer network, and the data exchange between heterogeneous network will be brought
Brand-new safety problem, certification, the seamless connection of security protocol between such as netting, because the performance of heterogeneous network is different, to net
The defence capability that network is attacked there is also huge difference, it is difficult with a kind of universal safety structure, therefore, Internet of Things pessimistic concurrency control is needed
Introduce one kind can more excellent treatment, fusions networked information, network specificity can be directed to and effectively improve sensing layer to cooperateing with layer
The processing system of information security.
The content of the invention
It is an object of the invention to overcome the deficiencies in the prior art, there is provided one kind can effectively process fusions networked information,
Improve efficiency of transmission, realize sensing layer and heterogeneous network seamlessly transit, the Internet of Things based on wireless relay system of seamless connection
Information processing and fusion method and its model.
To achieve the above object, technical scheme provided by the present invention is：Internet of Things information based on wireless relay system
Treatment and Fusion Model, it includes physical layer, transport layer, collaboration process layer and application layer, and the physical layer is provided with for perceiving
The sensing layer and user's control subsystem of physical environment, it also includes wireless relay system, and the wireless relay system is located at sense
Know layer to the centre of transport layer, the logic unit that the wireless relay system includes has wireless data physical layer processing unit, sensing
Device Data collecting conversion unit, information fusion unit, wireless data coding, decoding, encapsulation unit, synchronizing information processing unit,
Information exchange unit；Wireless data physical layer processing unit, sensor data acquisition converting unit, information fusion unit connect successively
Connect and three connects with synchronizing information processing unit；Wireless data coding, decoding, the encapsulation list connected with information fusion unit
Unit's interoperable links between transport layer and information exchange unit, and information exchange unit connects with process layer is cooperateed with.
Described collaboration process layer is cloud computing processing platform, the intelligent coordinated processing platform of grid processing platform composition.
Described collaboration process layer processes the intelligent coordinated treatment models such as model, grid treatment model and constitutes by cloud computing.
Internet of Things information processing based on wireless relay system and fusion method according to claim 1 gained, its feature
It is that it is included：
A, in sensing layer, multiple is embedded with perception device and RF tag（RFID）Sensor formed localized network,
Collaborative perception surrounding environment or oneself state, and perception information to obtaining carries out preliminary treatment and judgement, and according to system
Fixed rule is responded, and the perception information is transferred into wireless relay system；
B, due to multiple sensor synergisms perceive physical environment, perception information wireless relay system fusion and treatment mould
When being processed in block, multiple sensor senses information are divided into transmission message and neighbor information, and described transmission message is further transmitted
Transport layer into Internet of Things；
C, in wireless signal module, wireless signal is by after treatment and parsing, then the fusion for delivering to wireless relay system
In processing module, with the neighbor information in step B in the lump be detected, analysis, merge, and most at last fusion after information reporting
To collaboration process layer.
The wireless sensor network that the Internet of Things is used perceives the bunch member node of point as multiple using cluster structured
Data are collected and pre-process, and its row is monitored by the sampled data of bunch member node as the cluster aggregators of intermediate node
For, the credit worthiness of cluster aggregators is formed, wireless relay system carries out differentiation calculating to credit worthiness, and performs letter based on credit worthiness
Breath mixing operation, and the evaluation to fusion results is formed, the evaluation result of gained is used for objective decision and is added using radio communication
Close transmission.
The present invention after such scheme is employed, its great advantage be using wireless relay system as Internet of Things sense
Know the access gateway between layer and heterogeneous wireless communication networks, can automatic sensing ambient sensors presence, collect sensor network
Need the information of transmission and report collaboration process layer, be easy to multi-level Fusion, astride hierarchy fusion and the depth integration of information, have
Optionally parse the information from physical layer to transport layer and for cooperateing with treatment or control and decision-making, and utilize wireless relay
The characteristics of spreadability of itself is good so that whole Internet of Things data treatment coverage increase, networking flexibility, does not rely on base
Stand, construction cost is low, meanwhile, the wireless relay system can be combined with sensing layer, using the software and hardware processing unit of its own, be carried
Height is from sensing layer to the information security of collaboration process layer.
Brief description of the drawings
Fig. 1 is the hierarchy chart of Internet of Things pessimistic concurrency control of the invention.
Fig. 2 is Internet of Things information processing hierarchical model of the invention.
Fig. 3 is the message processing logic figure of wireless relay system of the invention.
Fig. 4 is the data safety information model figure of wireless relay system of the invention.
Specific embodiment
With reference to specific embodiment, the invention will be further described：
Referring to shown in accompanying drawing 1 to accompanying drawing 2, Internet of Things information processing based on wireless relay system described in the present embodiment with
Fusion Model, it includes physical layer 1, transport layer 2, collaboration process layer 3, application layer 4 and wireless relay system 5, wherein, it is described
Physical layer 1 be provided with sensing layer 101 and user's control subsystem 102 for perceiving physical environment, described wireless relay system
System 5 include sensor data acquisition converting unit 502, wireless data physical layer processing unit 501, information fusion unit 503,
Wireless data coding, decoding, encapsulation unit 504, synchronizing information processing unit 505, information exchange unit 506；Described is wireless
The initial data that Data Physical layer processing unit 501 is used to collect in physical layer is pre-processed；Described sensor number
It is used to gather the data conversion of the business information for obtaining Internet of Things connection physical environment according to collection converting unit 502；Described letter
Breath integrated unit 503 include pixel-based fusion, feature-based fusion and decision level fusion three-level syncretizing mechanism, pixel-based fusion be by
Collect and merged on the initial data level of sensor；Feature-based fusion is to utilize to be extracted from the raw information of sensor
Characteristic information carry out comprehensive analysis and treatment；Decision level fusion is to be merged the recognition result of multiple sensors, to refer to
Wave, control and decision-making offer foundation；Described wireless data coding, decoding, encapsulation unit 504, for being carried out to wireless data
The treatment such as corresponding coding, decoding, encapsulation, effect is wirelessly transferred to be optimal；Described information exchange unit 506, is used for
Information data in wireless network is interacted with the information data received in process layer 3 is cooperateed with.The system logic unit
Annexation be：Wireless data physical layer processing unit 501, sensor data acquisition converting unit 502, information fusion unit
503 are sequentially connected and three connects with synchronizing information processing unit 505；The wireless data connected with information fusion unit 503
Coding, decoding, the interoperable links between transport layer 2 and information exchange unit 506 of encapsulation unit 504, and information exchange unit 506 with
Collaboration process layer 3 connects.
The workflow is that the perception data that wireless data physical layer processing unit 501 collects sensing layer 101 is carried out
Pretreatment, sensor data acquisition converting unit 502 again changed data, and transmitted to information fusion unit 503 and carried out
Infomation detection, analysis and fusion；Wireless data coding, decoding, encapsulation unit 504 carry out the data after fusion to be wirelessly transferred place
Reason, strengthen data transfer reliability and security, and by information exchange unit 506 transport layer 2 with cooperate with process layer 3 between
Interoperable links are set up, data interaction between transport layer 2 and collaboration process layer 3 is realized, information processing efficiency is improved.
From Fig. 1 and Fig. 2, the sensing layer 101 in physical layer 1 gathers the various information of physical environment by perceiving, produces
Transmitted in raw data flow wireless relay system 5, wireless relay system 5 can be more conducive to the multi-level Fusion of information, astride hierarchy
Fusion and depth integration, and the information from physical layer 1 to transport layer 2 can be selectively parsed, the data flow after treatment is accessed
Transport layer 5 or cross-layer access collaboration process layer 3, and while a large amount of perception informations are transmitted, the information to transmitting is carried out transport layer 5
The treatment such as further fusion, data flow flows to collaboration process layer 3 again, and collaboration process layer 3 provides storage and processing function, performance
For various data centers use the technologies such as data mining, pattern-recognition and artificial intelligence in the form of middleware, there is provided
The processing functions such as data analysis, situation judgement and control decision；Data flow after treatment further accesses application layer 4, and user
Command stream is assigned by application layer 4, and reaches transport layer 2, wireless relay system down successively by cooperateing with process layer 3 to form controlling stream
5th, physical layer 1, wherein, control subsystem 102 in physical layer 1 can feedback effect in the physical environment for perceiving, realize intelligence
Energyization identification, positioning, tracking, monitoring and management.
Referring to shown in accompanying drawing 3, the message processing logic order of wireless relay system is：
A, in sensing layer, multiple is embedded with perception device and RF tag（RFID）Sensor formed localized network,
Collaborative perception surrounding environment or oneself state, and perception information to obtaining carries out preliminary treatment and judgement, and according to system
Fixed rule is responded, and the perception information is transferred into wireless relay system；
B, due to multiple sensor synergisms perceive physical environment, after sensor node perceives information, it can be with multiple
Around sensor form data interchange, the sensor of surrounding perception information simultaneously, thus perception information be divided into transmission message and
Neighbor information, greatly strengthen the reliability of information transfer, and described transmission message is further sent to Internet of Things after being processed
Transport layer in net, the heterogeneous network of transport layer also can carry out further fusion treatment to information；
C, in wireless signal module, wireless signal is by after treatment and parsing, then the fusion for delivering to wireless relay system
In processing module, with the neighbor information in step B in the lump be detected, analysis, merge, and most at last fusion after information cross-layer
Report to collaboration process layer.
By the information processing of wireless relay system, the multi-level of information, astride hierarchy and depth integration can be easy to, there is selection
Information of the ground parsing from physical layer to transport layer, and for collaboration treatment, control and decision-making, meanwhile, the appearance of wireless relay system
Amount is big, can in real time collect simultaneously, process the various data that multiple Internet of Things perceive point, meets to data acquisition and transmission real-time
Requirement, and the networking flexibility of wireless relay system is simple, wide coverage, construction cost are low, with existing Internet of Things pessimistic concurrency control
Seamless connection.
Referring to shown in accompanying drawing 4, the intermediate node of described wireless relay system perceptually layer 101 and transport layer 2, the nothing
Line relay system 5 is combined closely with sensing layer 101, using the encrypted transmission of radio communication and the wireless relay system 5
The processing unit of body is optimized, so as to improve the information security from sensing layer 101 to collaboration process layer 3.Due to Internet of Things by
Substantial amounts of heterogeneous network is constituted, but these network performances are different, the defence capability of network attack be there is also larger
Difference, the introducing of wireless relay system is just directed to network specific designs Special safety agreement and safeguard construction, wireless at this
The Data Detection of relay system 5, analysis, safety fusion and the basic ideas transmitted are：It is big that the fusion of its data safety is broadly divided into three
It is used in process module, i.e. data perception/pretreatment module, data fusion module, dbjective state/decision-making module, and Internet of Things
Wireless sensor network using popular cluster structured, multiple perceives points（Bunch member node）The collected perception of data go forward side by side
Row pretreatment, in fusion process, the multiple adjacent nodes in physical layer（Cluster aggregators）There is redundancy in the information of collection, i.e.,
Multiple intermediate nodes（Cluster aggregators）Data relation analysis and Elimination of Data Redundancy treatment are carried out, cluster aggregators pass through cluster member
The sampled data of node monitors its behavior（Based on statistics and information theory, each is weighed by the perception data of audit report
The confidence level of intermediate node）, the credit worthiness between cluster node is formd, and system is based on credit worthiness and performs mixing operation, and
Fusion results are transmitted to aggregation node, to complete last decision-making, biography is encrypted to the data after fusion or differentiation result
It is defeated, so as to enhance the security of Internet of Things information fusion.
The examples of implementation of the above are only the preferred embodiments of the invention, not limit implementation model of the invention with this
Enclose, therefore the change that all shapes according to the present invention, principle are made, all should cover within the scope of the present invention.
Claims (5)
1. based on wireless relay system Internet of Things information processing and emerging system, it include physical layer (1), transport layer (2),
Collaboration process layer (3) and application layer (4), the physical layer (1) is provided with to be controlled for the sensing layer (101) for perceiving physical environment and user
Subsystem (102), it is characterised in that：It also includes wireless relay system (5), and the wireless relay system (5) is positioned at perception
Layer (101) to the centre of transport layer, the logic unit that the wireless relay system (5) includes has wireless data physical layer processing unit
(501), sensor data acquisition converting unit (502), information fusion unit (503), wireless data coding, decoding, encapsulation are single
First (504), synchronizing information processing unit (505), information exchange unit (506)；Wireless data physical layer processing unit (501),
Sensor data acquisition converting unit (502), information fusion unit (503) are sequentially connected and three is single with synchronizing information treatment
First (505) connect；Wireless data coding, decoding, the encapsulation unit (504) connected with information fusion unit (503) are in transport layer
(2) interoperable links and between information exchange unit (506), and information exchange unit (506) connect with process layer (3) is cooperateed with.
2. Internet of Things information processing and emerging system based on wireless relay system according to claim 1, its feature exists
In：Described transport layer (2) includes the wireless-transmission network such as broadband wireless network, cellular network.
3. Internet of Things information processing and emerging system based on wireless relay system according to claim 1, its feature exists
In：Described collaboration process layer (3) is cloud computing processing platform, the intelligent coordinated processing platform of grid processing platform composition.
4. Internet of Things information processing based on wireless relay system and the construction method of emerging system, it is characterised in that it includes
Have：
A, in sensing layer, the sensor that multiple is embedded with perception device and RF tag (RFID) forms localized network, collaboration
Perceive surrounding environment or oneself state, and perception information to obtaining carries out preliminary treatment and judgement, and according to formulating
Rule is responded, and the perception information is transferred into wireless relay system；
B, due to multiple sensor synergisms perceive physical environment, perception information is in the fusion and processing module of wireless relay system
During treatment, multiple sensor senses information are divided into transmission message and neighbor information, and described transmission message is further sent to thing
Transport layer in networking；
C, in wireless signal module, wireless signal is by after treatment and parsing, then fusion and the place for delivering to wireless relay system
Reason module in, with the neighbor information in step B in the lump be detected, analysis, merge, and most at last merge after information reporting to association
Same process layer.
5. the structure side of the Internet of Things information processing based on wireless relay system according to claim 4 and emerging system
Method, it is characterised in that：The wireless sensor network that the Internet of Things is used using cluster structured, as multiple perceive the clusters of point into
Member's node data is collected and pre-processes, and is monitored by the sampled data of bunch member node as the cluster aggregators of intermediate node
Its behavior, forms the credit worthiness of cluster aggregators, and wireless relay system carries out differentiation calculating to credit worthiness, and is held based on credit worthiness
Row information mixing operation, and the evaluation to fusion results is formed, the evaluation result of gained is used for objective decision and utilizes channel radio
Letter encrypted transmission.
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| CN104683109B (en) * | 2015-03-14 | 2018-03-06 | 西安电子科技大学 | RFID Verification Systems and authentication method based on location privacy cloud |
| CN107103104B (en) * | 2016-02-19 | 2023-10-27 | 鹰驾科技（深圳）有限公司 | Vehicle intelligent network connection testing system based on cross-layer cooperative architecture |
| CN108710322A (en) * | 2018-05-17 | 2018-10-26 | 武汉理工大学 | A kind of ocean containers intelligent networking TT&C system based on Zigbee |
| CN109462656A (en) * | 2018-12-03 | 2019-03-12 | 深圳智慧园区信息技术有限公司 | A kind of intelligence managing and control system |
| CN113450016A (en) * | 2021-07-15 | 2021-09-28 | 上海赛扬信息技术有限公司 | Fixed asset management system based on BIM technology |
| CN114845337B (en) * | 2022-03-29 | 2023-04-25 | 江苏赛立科技有限公司 | Multi-network fusion sensing information intelligent transmission control method and system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1996920A (en) * | 2006-11-29 | 2007-07-11 | 北京邮电大学 | Novel method for wireless communication networking based on the cooperation mechanism |
| CN101640825A (en) * | 2009-08-19 | 2010-02-03 | 刘文祥 | Integration of three networks |
| CN102055800A (en) * | 2010-12-13 | 2011-05-11 | 南京大学 | Traffic internet of things (IOT) layering system architecture based on information gathering |
| CN203366088U (en) * | 2013-06-18 | 2013-12-25 | 上海辰竹仪表有限公司 | Gas monitoring system based on Zigbee Network |
| CN103745325A (en) * | 2013-12-19 | 2014-04-23 | 柳州职业技术学院 | Internet of things logistics communication system based on data fusion |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090234503A1 (en) * | 2008-03-12 | 2009-09-17 | Shoel-Lai Chen | Automatic switch device by sensing direction for a handheld apparatus having double-sided keypad arrangement |
| DE112011104865B4 (en) * | 2011-02-09 | 2019-01-17 | Mitsubishi Electric Corporation | Sensor control device |
-
2014
- 2014-07-07 CN CN201410318186.5A patent/CN104092753B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1996920A (en) * | 2006-11-29 | 2007-07-11 | 北京邮电大学 | Novel method for wireless communication networking based on the cooperation mechanism |
| CN101640825A (en) * | 2009-08-19 | 2010-02-03 | 刘文祥 | Integration of three networks |
| CN102055800A (en) * | 2010-12-13 | 2011-05-11 | 南京大学 | Traffic internet of things (IOT) layering system architecture based on information gathering |
| CN203366088U (en) * | 2013-06-18 | 2013-12-25 | 上海辰竹仪表有限公司 | Gas monitoring system based on Zigbee Network |
| CN103745325A (en) * | 2013-12-19 | 2014-04-23 | 柳州职业技术学院 | Internet of things logistics communication system based on data fusion |
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