CN103780682B - A kind of information sharing system towards Ad Hoc network - Google Patents
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Abstract
The invention discloses a kind of information sharing system towards Ad Hoc network.The system includes access control subsystem, data integration subsystem, metadatabase management subsystem, isomeric data access agent subsystem, node administration subsystem data transmission subsystem.After the present invention, the information sharing of Ad Hoc network can be realized, the system adopts stagewise node administration, using the information sharing method based on metadata and metadata segment incremental update synchronous method, the characteristics such as the node dynamic access of Ad Hoc network, network topology dynamic change, Bandwidth-Constrained are adapted to, solve the sharing problem of information between Ad Hoc network node.
Description
Technical field
The present invention relates to Ad Hoc network Information Sharing Technology field, more particularly to a kind of letter towards Ad Hoc network
Breath shared system.
Background technology
The multi-hop that Ad Hoc network is made up of one group of mobile terminal with wireless transmitter acentric
Provisional autonomous system.Ad Hoc network typically adopts distributed control structure, i.e. distributed network structure and layering point completely
Cloth controlling network structure, both network structures are referred to as planar structure and hierarchy again.
Ad Hoc network has non-stop layer, self-organizing, multihop routing, independence networking, node motion, is restricted and diversity
Link bandwidth the features such as, this cause it a lot of special occasions communications applications have uniqueness advantage.At the beginning of Ad Hoc network
Inner feelings is serviced for Military Application, be for meeting the need of battlefield survival is strong, nothing is fixed facility and the connection of over the horizon scope
Want and grow up, due to available without infrastructure such as base stations on the battlefield of modernization, be equipped with mobile communications device
Army personnel, will can receive in target area by mobile Ad Hoc network between military vehicle and various military equipments
The critical positions and environmental information of collection are sent to process node and enter row information exchange, without relying on land or satellite communication system
System.While it is also the collaboration Mobile Data Interchange in industry and commerce, as the supplement of cellular mobile network, wearable computing, and
A kind of effective solution is provided in the applied environment such as disaster relief and provisional communication, be with a wide range of applications.
As Ad Hoc network communication bandwidth is limited, and the spy with non-stop layer self-organization and network topology dynamic change
Point so that the information sharing in Ad Hoc network between each node has very big difficulty.For structure in Ad Hoc network
Build various application systems, it is necessary to a kind of effective information sharing mechanism is provided, so that the information energy in network between each node
Enough easily cooperateed with and interacted.The method for solving information sharing between node in traditional Ad Hoc network is to adopt unification
Interface protocol realize the data exchange of " point-to-point " between the two nodes, most typical solution is to define message format
Or file transformat, information sharing remains in the shared of " technological layer ", the information search based on content with find energy
Power is not enough, and this point-to-point information sharing mechanism is not suitable with Ad Hoc network node and arbitrarily accesses and network topology dynamic change
Feature.
Content of the invention
It is an object of the invention to provide a kind of information sharing system towards Ad Hoc network, the system is adapted to net
The dynamic change of network topology, supports the dynamic access of network node, and can realize base between each node under conditions of Bandwidth-Constrained
Information sharing in content retrieval.
A kind of information sharing system towards Ad Hoc network of the present invention, the such as Fig. 1 of the annexation between each subsystem institute
Show, access control subsystem（100）Data integral subsystem（200）Connection, data integration subsystem（200）And metadatabase
Management subsystem（300）, isomeric data access agent subsystem（400）Connection, metadatabase manage subsystem（300）And node
Management subsystem（500）, data transmission sub-system（600）Connection, isomeric data access agent subsystem（400）Data is transmitted
Subsystem（600）Connection, each subsystem are cooperated and complete jointly the shared of information.Shared system mainly includes：
1st, access control subsystem（100）
Access control subsystem（100）Including access control module（110）, with data integration subsystem（200）Connection, carries
For controlling the function of access information shared system authority, authority includes to register metadata schema data, accesses metadata schema number
According to, log-on message resource, delete information resources, fresh information resource and Query Information resource.
2nd, data integration subsystem（200）
Data integration subsystem（200）Including sharing information issuing module（210）, share information searching module（220）With
Shared info access module（230）, subsystem is managed with metadatabase（300）With isomeric data access agent subsystem（400）
Connection；
（1）Shared information is issued
Application is by sharing information issuing module（210）Information resources are carried out with metadata token, the content of mark is main
Include findings that class metadata (for the description of information, discovery and retrieval), access class metadata（Acquisition and visit for information
Ask）With understand class metadata（For the structure of description information, form and semanteme）, share information issuing module（210）By these
The metadata of mark is loaded into metadatabase management subsystem（300）Metadatabase management module（320）In；
（2）Shared information retrieval
Shared information searching module（220）Access metadatabase management subsystem（300）Metadatabase management module
（320）The shared information retrieval function based on content-keyword is provided for application, the resource searching ability based on keyword is provided；
（3）Shared message reference
Shared info access module（230）By isomeric data access agent subsystem（400）Complete to share acquisition of information
And access function, the difference of resource storage location and access mode is shielded, shares info access module（230）Slow being locally provided with
Deposit, improve the efficiency to information access information again.
3rd, metadatabase management subsystem（300）
The present invention adopts the synchronous logic storage strategy of locally stored Data Physical storage strategy and meta-data distribution formula,
The metadata of information is synchronized to each node by metadata segment incremental update synchronous method, by metadata index building is
The present invention realizes INFORMATION DISCOVERY and shared core, and the policy data storage is simple, and communication overhead is little, supports that efficient information is visited
Ask, it is adaptable to the limited Ad Hoc network of Site autonomy communication bandwidth.
Metadatabase manages subsystem（300）Including metadata schema management module（310）, metadatabase management module
（320）With metadata synchronization module（330）, with node administration subsystem（500）Data transmission subsystem（600）Connection；Institute
The metadata schema management module that states（310）With metadatabase management module（320）Set up definition and form, the information of metadata
Metadata description, and set up index storage；Described metadata synchronization module（330）In real time by local node metadata information
Other each nodes are synchronized to, complete each node metadata synchronization.Metadatabase manages subsystem（300）In each functions of modules such as
Under：
（1）Metadata schema is managed
Metadata schema management module（310）The main responsible definition that sets up with more new metadata and form；
（2）Metadatabase is managed
Metadatabase management module（320）Storage, renewal and the deletion of metadata is carried out to metadatabase；
（3）Metadata synchronization
The system adopts metadata segment incremental update synchronous method, realizes the unified logic of each nodal information.Due to altogether
Enjoy data source relatively to fix, associated metadata renewal frequency less, therefore can ensure each node unit with than relatively low communication cost
Data syn-chronization, on the basis of each node metadata synchronization, information inquiring request is only submitted to local node, has saved network
Bandwidth, realizes the shared of information.
Metadata synchronization module（330）Responsible metadata synchronization.Each metadata has a current version number, each unit
Data increment updates and also all corresponds to an incremental version number.Additionally, each increment version safeguards that not yet updates the increasing
The distant-end node queue of amount.After present node receives other nodes to the confirmation of certain incremental update, just by corresponding node from this
Remove in the related queue of incremental update.Corresponding " renewal " queue of first incremental update of present node is space-time, when
Front version number is updated to the version number of the incremental update.
The synchronous version of one node of each node maintenance corresponds to table, and every a line of the table corresponds to this node phase
Metadata synchronization to distant-end node is recorded.When the incremental update for having other nodes is sent to this node, this node is first
The incremental update is applied to this node, while the corresponding line of form is updated, the version number of the incremental update has been added to more
In new version number queue, when renewal is not lacked between more new version number and the current version number of record, it is possible to will note
The current version number of record is updated to continuous maximum more new version number, while current version will be less than in more new version number queue
The increment version number of this number deletes.Finally, this node confirms metadata incremental update success to distant-end node.
A timer is maintained in the middle of each node, whenever the time leaf length that specifies is reached, unified to which
The index data of his this node of node-node transmission incremental update in current time piece, after other index nodes receive index data
Incremental update itself is indexed, and makes itself index and global index's synchronization.Each node can store the incremental update of this node always,
Until the incremental update that it receives other all nodes confirms.
In order to reduce the impact that index metadata is produced to other combat data transmission and communications in transfers on network as far as possible, adopt
With segmentation Hash and deletion repeat techniques, the variance data of minimum is only transmitted, during transmission index metadata, it is intended that time length of a film
Degree, channel idle rate threshold value, bandwidth occupancy amount etc., carry out data transmission control.
4th, isomeric data access agent subsystem（400）
Isomeric data access agent subsystem（400）Class metadata is accessed by parsing, provide from data access mode
Isomery data form and the service of semantic two aspect transparent access isomeric data of isomery.Isomeric data access agent subsystem
（400）Including file access module（410）, database access module（420）With message access modules（430）, file access mould
Block（410）Realize the access to file system, database access module（420）The access to Database Systems is realized, message is visited
Ask module（430）Realize the access to asynchronous message.
5th, node administration subsystem（500）
The node administration of information sharing system adopts hierarchy, and network is divided into cluster (Cluster), and each cluster is by one
Individual cluster head (Cluster Header) and multiple cluster members (Cluster Member) constitute, and these cluster heads define higher leveled
Network, in higher leveled network, again can sub-clustering again, form more higher leveled network again, until highest.Hierarchy
In, the forwarding of data between leader cluster node dynamic monitoring cluster internal segment dotted state responsible cluster, leader cluster node are elected using algorithm.
Node administration subsystem（500）Including network topology management module（510）With node state monitoring module（520）, network topology
Management module（510）For to the division of physical node cluster in Ad Hoc network and the election of cluster head, node state monitoring module
（520）The state of monitor node manages subsystem for metadatabase（300）Nodal information is provided.
6th, data transmission sub-system（600）
Data transmission sub-system（600）Including data transmission module（610）, data transmission sub-system（600）Obtain Ad
The route of Hoc network and channel information, manage subsystem to metadatabase（300）With isomeric data access agent subsystem
（400）Data message be transmitted.
Compared with prior art, a kind of innovation of the information sharing system towards Ad Hoc network of the present invention is：
Achieve work(is accessed based on the information sharing of metadata, there is provided the full-text search function based on content-keyword and isomeric data
Can, so that network overhead is effectively controlled, be embodied in：
1st, node administration subsystem is adapted to the dynamic change of network topology, supports the dynamic access of network node and moves back
Go out；
2nd, metadatabase management subsystem and isomeric data access agent subsystem are achieved between each node and are examined based on content
The information sharing of rope and the access of isomeric data；
3rd, metadata synchronization module is solved using incremental update index synchronized algorithm and is indexed under conditions of Bandwidth-Constrained
Stationary problem, makes network overhead be effectively controlled.
Description of the drawings
Fig. 1 information sharing system composition figure；
Fig. 2 information sharing system uses flow chart；
Fig. 3 node administration figure；
Fig. 4 shares information and issues, retrieves browsing process figure；
Fig. 5 metadata segment incremental update synchronous method figure.
Specific embodiment
Specific embodiment to the present invention is described further below in conjunction with the accompanying drawings.Here it should be noted that for
The explanation of these embodiments is used to help understand the present invention, but does not constitute limitation of the invention.Additionally, disclosed below
As long as each embodiment of the present invention in involved technical characteristic do not constitute conflict each other and can just be mutually combined.
In whole Ad Hoc network information sharing system, including Ad Hoc network, information sharing system and use information
Shared application.As shown in figure 1, a kind of information sharing system towards Ad Hoc network that the present invention is provided includes access control
Subsystem（100）, data integration subsystem（200）, metadatabase management subsystem（300）, isomeric data access agent subsystem
System（400）, node administration subsystem（500）Data transmission subsystem（600）Be connected with each other.
1st, the information sharing system for combining Fig. 2 present invention offer is as follows using process step：
Step S1：Need related software system of the present invention, information sharing system after installation are installed during using the present invention
Load node administration subsystem（500）, node administration subsystem（500）In network topology management module（510）To Ad Hoc
Physical node in network carries out the division of cluster and condition managing, and in Fig. 3, a figure is the sub-clustering node administration of planar structure, network
Cluster (Cluster) is divided into, each cluster is by a cluster head (Cluster Header) and multiple cluster member (Cluster
Member) constitute, two figures are the sub-clustering node administration of hierarchy, and two kinds of structures are all to carry out metadata synchronization in cluster, between cluster
Request of data access is carried out by cluster head, node be dynamically added and exit the use that has no effect on other nodes to the system.
Node administration subsystem（500）In node state monitoring module（520）Monitoring Ad Hoc network node state, by nodal information
Pass to metadatabase management subsystem（300）, metadatabase management subsystem（300）In metadata synchronization module（330）Root
The metadata synchronization of the overall situation is carried out according to nodal information.
Step S2：Application is by access control subsystem（100）Use information shared system, access control module（110）
Control application is for the access rights of information sharing system, main including registering metadata schema data, accessing metadata schema
The authority of data, log-on message resource, deletion information resources, fresh information resource and Query Information resource.
Step S3：Data integration subsystem（200）Information sharing system access interface is provided for application, application is by shared
Information issuing module（210）The metadata of information is published to metadatabase and manages subsystem（300）Realize sharing information issue；
Shared information searching module（220）The resource searching ability provided based on keyword for application is realized sharing information retrieval；Shared
Info access module（230）Application is transferred to isomeric data access agent subsystem to the access request of information（400）Process screen
The difference of resource storage location and access mode is covered, realizes sharing message reference.
Step S4：Metadatabase manages subsystem（300）It is the nucleus module of information sharing system, metadata synchronization module
（330）Receiving step S1 interior joint manages subsystem（500）The nodal information of submission simultaneously passes through data transmission sub-system（600）Enter
Row metadata synchronization；Metadata schema management module（310）The management being responsible for metadata schema, metadatabase management module
（320）Be responsible for index being set up to metadata and be stored as data integration subsystem（200）There is provided the information of sharing to issue and retrieval clothes
Business.
Step S5：Isomeric data access agent subsystem（400）For data integration subsystem（200）There is provided the information of sharing to visit
The service of asking, shares information by data transmission sub-system（600）It is transmitted.
Step S6：Data transmission sub-system（600）Including data transmission module（610）, data transmission sub-system（600）Obtain
Route and the channel information of Ad Hoc network is taken, subsystem is managed to metadatabase（300）With isomeric data access agent subsystem
System（400）Solicited message be transmitted.
2nd, the issue of shared information, retrieval and the accessing step for combining Fig. 4 present invention offer is as follows：
（1）, metadatabase management subsystem（300）Metadata schema management module（310）Carry out metadata schema pipe
Reason, main include to formulate and issue metadata specification, metadata schema is by finding class metadata schema（For the description of information,
It was found that and retrieval）, access class metadata schema（Obtain for information data and quality of service policy description）With understand class unit number
According to model（For the structure of description information, form and semanteme）, and be stored in metadata schema management storehouse.
（2）, application using data integration subsystem（200）Shared information issuing module（210）Using metadata schema
And information is described according to Description standard and information issue, it is published to metadatabase management subsystem（300）Metadatabase
Management module（320）Metadatabase in.
（3）, metadatabase management subsystem（300）Metadatabase management module（320）To data integral subsystem（200）
Shared information issuing module（210）The metadata of issue is registered, and sets up search index, metadata to metadata information
Synchronization module（330）By metadata synchronization to other nodes.
（4）, need obtain share information application pass through data integration subsystem（200）Shared information searching module
（210）Full-text search based on content is carried out to information.
（5）, metadatabase management subsystem（300）Metadatabase management module（320）Return all related metadata
Index information, is as a result an index of metadata record list for having arranged sequence.
（6）, application by data integration subsystem（200）Shared info access module（230）Access in retrieval result
The metadata information of record, and call isomeric data access agent subsystem（400）Access True Data.
（7）, isomeric data access agent subsystem（400）Parsing data integration subsystem（200）Shared message reference mould
Block（230）The metadata information of offer, by file access module（410）, database access module（420）Mould is accessed with message
Block（430）Parsing is shared information and calls data transmission sub-system（600）It is transmitted.
（8）, data transmission sub-system（600）Data transmission module（610）Route and channel is selected to pass through Ad Hoc network
Information is shared in transmission.
3rd, the metadata segment incremental update synchronous method step for combining Fig. 5 present invention offer is as follows：
Metadata synchronization module（330）In real time local node metadata information is synchronized to other each nodes, completes each
Node metadata synchronization, the system update synchronous method using Segmented delta, realize the unified logic of each nodal information.Due to
Shared information source is relatively fixed, and associated metadata renewal frequency less, therefore can ensure each node with than relatively low communication cost
Index of metadata keeps synchronous, and on the basis of index of metadata global synchronization, inquiry request is only submitted to local node, realizes
Information shared.
Local node updates synchronous method using Segmented delta, and node index of metadata has a current version number, section
The current index version number of point 1 is v1_0, and each incremental update also corresponds to an incremental version number, and node 1 currently has three
To other all nodes, version number is v1_1, v1_2 and v1_3 to individual incremental update.Additionally, each incremental update safeguards one
The distant-end node queue of the increment index is not yet updated, and the node queue that such as the v1_1 index delta of node 1 is safeguarded includes node
2nd, node 3 etc..After index node receives the confirmation that other nodes update to certain increment index, just by corresponding node from the increasing
Remove in the related queue of amount index upgrade.When corresponding " renewal " queue of first incremental update of index node is sky
When, the current version number of index node is updated to the version number that the increment index updates.
One node of each node maintenance metadata synchronization version correspond to table, the table every a line correspondence one sheet
The index of metadata synchronous recording of node opposite proximal end node.This node is sent to whenever the increment index for having other nodes updates
When, the increment index is updated and is applied to this node by this node first, while the corresponding line of form is updated, by the increment index more
New version number is added in more new version number queue, does not lack between more new version number and the current version number of record when
Lose when updating, it is possible to update the current version number of record to continuous maximum more new version number, while by more new edition
Increment version number in this number queue less than current version number deletes.Finally, this node confirms increment index more to distant-end node
New success.When index delta as v1_0 to the v1_3 in node 1 is all reached, the updated node of the node 1 of the maintenance of node 2
Number it is changed into v1_3.
A timer is maintained in the middle of each node, whenever the time leaf length that specifies is reached, unified to which
The index data of his this node of node-node transmission incremental update in current time piece, after other index nodes receive index data
Incremental update itself is indexed, and makes itself index and global index's synchronization.Each node can store the incremental update of this node always,
Until the incremental update that it receives other all nodes confirms.
The present invention is not only limited to above-mentioned specific embodiment, and persons skilled in the art are public according to embodiment and accompanying drawing
The content that opens, can implement the present invention using other multiple specific embodiments, so every without departing from disclosed in this invention
The equivalent or modification completed under spirit, both falls within the scope of protection of the invention.
Claims (7)
1. a kind of information sharing system towards Ad Hoc network, it is characterised in that：The system includes：Access control subsystem
(100) connection of data integral subsystem (200)；Data integration subsystem (200) and metadatabase management subsystem
(300), the connection of isomeric data access agent subsystem (400)；Metadatabase management subsystem (300) and node administration subsystem
System (500), the connection of data transmission sub-system (600)；Isomeric data access agent subsystem (400) data transmission subsystem
(600) connection；Wherein,
Data integration subsystem (200) are using finding class metadata, access class metadata, understand class metadata to shared letter
Breath resource is marked；
Metadatabase management subsystem (300) is using locally stored Data Physical storage strategy and meta-data distribution formula synchronous
Logic storage strategy, the metadata of information are synchronized to each node by metadata segment incremental update synchronous method；
Isomeric data access agent subsystem (400) provides isomery data form and the semantic isomery from data access mode
The service of two aspect transparent access isomeric datas.
2. a kind of information sharing system towards Ad Hoc network according to claim 1, it is characterised in that：Described visit
Ask that control subsystem (100) includes access control module (110), be connected with data integration subsystem (200), control is provided and is accessed
The function of information sharing system authority, authority include to register metadata schema data, access metadata schema data, log-on message
Resource, deletion information resources, fresh information resource and Query Information resource.
3. a kind of information sharing system towards Ad Hoc network according to claim 1, it is characterised in that：Described number
Include to share information issuing module (210), share information searching module (220) and the visit of shared information according to integral subsystem (200)
Module (230) is asked, is connected with metadatabase management subsystem (300) and isomeric data access agent subsystem (400), share letter
It is shared that breath release module (210) and shared information searching module (220) manage subsystem (300) offer by access metadatabase
Information is issued and the shared information retrieval function based on content-keyword；Shared info access module (230) pass through isomeric data
Access agent subsystem (400) is provided shares acquisition of information and access function.
4. a kind of information sharing system towards Ad Hoc network according to claim 1, it is characterised in that：Described unit
Data base management subsystem (300) includes metadata schema management module (310), metadatabase management module (320) and first number
According to synchronization module (330), it is connected with node administration subsystem (500) data transmission subsystem (600)；Described metadata mould
Type management module (310) and metadatabase management module (320) set up information using the information sharing method based on metadata
Metadata description and index of metadata storage；Described metadata synchronization module (330) is same using metadata segment incremental update
Local node metadata information is synchronized to other each nodes by one step process, completes each node metadata synchronization.
5. a kind of information sharing system towards Ad Hoc network according to claim 1, it is characterised in that：Described is different
Structure data access agent subsystem (400) includes that file access module (410), database access module (420) and message are accessed
Module (430), file access module (410) realize the access to file system, and database access module (420) is realized to data
The access to isomery message, the data of data integration subsystem (200) are realized in the access of storehouse system, message access modules (430)
Access request completes data access by data transmission sub-system (600), realizes the unified access of Heterogeneous Information.
6. a kind of information sharing system towards Ad Hoc network according to claim 1, it is characterised in that：Described section
Point management subsystem (500) includes network topology management module (510) and node state monitoring module (520), network topology pipe
Reason module (510) is used for carrying out the division of cluster and the election of cluster head to Ad Hoc network physical node；Node state monitoring module
(520) state of monitor node, is that metadatabase management subsystem (300) provides nodal information.
7. a kind of information sharing system towards Ad Hoc network according to claim 1, it is characterised in that：Described number
Include data transmission module (610) according to transmission subsystem (600), data transmission sub-system (600) obtains the road of Ad Hoc network
By and channel information, be responsible for metadatabase management subsystem (300) and isomeric data access agent subsystem (400) data
Information is transmitted.
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| CN105630998A (en) * | 2015-12-28 | 2016-06-01 | 北京锐安科技有限公司 | Metadata management method, device and system |
| CN106251273A (en) * | 2016-08-16 | 2016-12-21 | 四川理工学院 | The KXG of a kind of radioactive solid waste and method |
| CN106446243A (en) * | 2016-10-10 | 2017-02-22 | 山东浪潮云服务信息科技有限公司 | Data integration structure of relational database |
| CN106453435B (en) * | 2016-12-21 | 2020-04-03 | 中国人民解放军31401部队150分队 | Data sharing authorization method based on block chain |
| CN107332679B (en) * | 2017-06-06 | 2021-01-15 | 北京元心科技有限公司 | Centerless information synchronization method and device |
| CN107705838A (en) * | 2017-09-30 | 2018-02-16 | 武汉联影医疗科技有限公司 | A kind of transmission method of medical image, device, server, medium and system |
| CN111585898B (en) * | 2020-05-08 | 2021-06-25 | 西安电子科技大学 | Routing information increment transmission method facing wireless self-organizing network |
| CN112351079B (en) * | 2020-10-23 | 2021-10-22 | 武汉大学 | Space application and data integrated packaging system and method based on data box |
| CN112784288A (en) * | 2021-01-22 | 2021-05-11 | 尚娱软件（深圳）有限公司 | Access management method, terminal, and computer-readable storage medium |
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