CN101039321A - Mixed mobile agent-based wireless sensor network data transmission method - Google Patents
Mixed mobile agent-based wireless sensor network data transmission method Download PDFInfo
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Abstract
A data transmission method of wireless sensor network based on multiple mobile agents introduces the mobile agents into the data collection and transmission for network. The main strategies of the method are: 1. collecting local data through self-equipped processing capability of software mobile agents and carrying out local processing; 2. starting hardware agents for continuously carrying out data collection and transmission for a local part of the network during a period with requirement of massive data collection and transmission. Thereby, the traditional mode pattern of distributed user terminal/server of a system is changed, data flow transmitted from a sensor node to a base station (or a gateway) is greatly decreased, the manner of data transmission is simplified and the purpose of energy saving and efficiency is realized. On condition of that once these matters occur in the network, the user needs to obtain accurate and real-time information, a self-navigation mechanism of the hardware agent can get to the occurring area, and the hardware agent can speedily collect and transmit the data cared by the user based on its excellent capability of management and communication.
Description
Technical field
The present invention relates to the solution that a kind of wireless sensor network data is collected.Be mainly used in the problem that solves efficient networking and transfer of data in the wireless sensor network, belong to sensor network and Distributed Calculation crossing domain.
Background technology
Along with transducer, microelectromechanical-systems and development of wireless communication devices, wireless sensor network becomes a kind of brand-new information and obtains and treatment technology.It can be applied to connect up and power supply is supplied with difficult regional, zone that personnel can not arrive (as polluted, zone that environment can not be destroyed or hostile) and some interim occasions (as the generation natural calamity, fixed communication network is destroyed) etc.Therefore, sensor network has very wide application prospect, all there is important scientific research to be worth and huge practical value in many fields such as military and national defense, industrial or agricultural, city management, biologic medical, environmental monitoring, rescue and relief work, anti-probably anti-terrorism, deathtrap Long-distance Control, caused the great attention of world many countries military circles, academia and industrial quarters, and become and entered since 2000 the hot research field, emerging forward position of generally acknowledging, be considered to one of technology with power that 21st century is had an immense impact on.
Different with traditional wireless network, wireless sensor network has its special characteristics: hardware resource is limited, power supply capacity is limited, self-organizing, data are the center, multi-hop, dynamic topology, number of nodes are numerous densely distributed etc.The function of network is not to provide impartial service for each node, but all sensor nodes are made the information of monitored target in as a whole cooperation perception, collection and the processing network's coverage area, and information filtered by certain mode and merge and then offer the user.Sensor node normally is deployed in a certain particular surroundings at random, and environment is monitored or specific objective is positioned and follows the trail of.Therefore, to be sent to user place be the basis that wireless sensor network is able to extensive use to the data that sensor node is collected quick, accurate, energy-conservationly.Yet, in the intensive sensor network of height of node, use a series of complicated network communication protocols to carry out transfer of data based on traditional theory, MAC (MediumAccess Control medium access control) and various types of Routing Protocol as contention formula or reservation type, certainly will bring the huge expense of network, increase the energy consumption of network, thereby cause network life to shorten greatly.So good data transmission method is extremely important for wireless sensor network.
Mobile proxy technology is a kind of emerging network technology, and it has been simplified distributed system and must design, realizes and safeguard.Mobile agent can be stand-alone computer software or hardware entities, and it can carry out certain rules, and has mobility, can independently finish specific task.Mobile proxy technology is become a new hot technology because himself numerous advantage is applied in all many-sides such as ecommerce, network management preferably.Mobile proxy technology is combined with the wireless sensor network data transmission dexterously, can simplify complicated in the past communication control procedure greatly, reduce node communication expense and data traffic, thereby be that the user provides satisfied service, and prolong network life effectively with minimum expense.
Summary of the invention
Technical problem: the purpose of this invention is to provide a kind of wireless sensor network data transmission method based on mixed mobile agent, it is big to be used to solve current massive wireless sensor data transfer overhead, rules complexity, problem such as energy consumption is big.The present invention can significantly improve the efficient of wireless sensor network image data transmission data, prolongs the life cycle of network and simplifies Network Design.
Technical scheme: the present invention is a kind of comprehensive tactic method, and existing wireless sensor network can move and carry out corresponding data transfer task in this way.The present invention is incorporated into mobile agent in the data acquisition and transmission of network, and its main policies is: 1. the disposal ability that self has by the software mobile agent, collect local data, and carry out this locality processing; 2. in some time period that needs large-scale data collection and transmission, enable data collection and transmission that hardware agent continues a certain part of network.Thereby changed the general layout of traditional distributed system client/server mode, reduced greatly, simplified data transfer mode, reached the purpose of efficient energy-saving from the data volume of sensor node to base station (or gateway) transmission.The mixed mobile agent that the present invention proposes mainly is made up of two types of mobile agents:
Soft agency: software entity with certain logic rules.It can independently finish specific function, and has animal migration, can or copy to another node from a node migration, when needing code and program execution state is moved simultaneously.
Hard agency: powerful hardware cell has very strong communication capacity and data-handling capacity, and can move freely in network.Specific implementation can be unmanned vehicle, aircraft or other unmanned machine of the powerful terminal of assembling.
Architecture: Fig. 1 has provided a wireless sensor network system assumption diagram that uses this data transmission method.In sensor network, sensor node is divided into several sheets by the region.Each sheet has a sheet head node, is responsible for collecting the data that all ordinary nodes collected in this sheet, and data are informed user interface node.Ordinary node in the sheet just can arrive the sheet head node by single-hop.As from the foregoing, this architecture has comprised three kinds of sensor nodes that responsibility is different altogether:
Ordinary node: this category node is present in some, is responsible for the perception environmental change, and target moves etc., and the data transmission method that adopts us to propose finally is sent to user interface node with the data of collecting.Node is known self-position, finite energy, and disposal ability is limited, and has an opportunity dynamically to be selected to the sheet head node.Ordinary node regularly exchanges a small amount of necessary information with its neighbor node, and as the node identifier, energy remains, and communication capacity etc. are safeguarded a neighbor list thus.
Sheet head node: dynamically select by ordinary node.Can adopt different selection strategies as required, basic thought is to select a sheet self-energy abundance and the strong node of communication capacity.The head intranodal is preserved all effective ordinary node tabulation and adjacent sheet head node information lists in the sheet.
User interface node: be in the special joint of network edge, very strong processing and communication capacity are arranged, be used to collect the information in the whole sensor network, and formation and user's interface, inform the user for user inquiring or with event.
Method flow: the present invention regularly distributes the software inquiry proxy by the sheet head node earlier in the zone of its administration, and this agency travels through ordinary node in all sheets, notes the necessary information of the node that mates with query contents, and these information are taken back the head node.The sheet head node is retrieved all information of noting, in case find to have necessity of obtaining data in a large number, then sends request to user interface node.After user interface node receives request, can send the hard part of acting on behalf of network, directly carry out data collection to sensor node, and with the data tape reuse family interface node of collecting, the step that data transmission method comprised of utilizing mixed mobile agent to carry out wireless sensor network is:
Step 1). all the sensors node in the burst exchanges information each other by simple neighbours HELLO agreement, comprises sign, the position, the energy field, each node all has one to safeguard a neighbor information table, is used for soft agency's migration and electing of sheet head node,
Step 2). exchange information between the sheet head node, each sheet head node is also safeguarded neighbours' head information table simultaneously, equally also comprises sign, the position, energy and communication overhead,
Step 3). user interface node is to all head intranodal inundation software tasks agency of network, and this agency is sheet assign tasks all in the network by simple inundation mode, and task agent can be according to need not the changing of user's request,
Step 4). the sheet head node is received task agent, extract task description, and preservation task agent, the task description that will extract before is encapsulated in the new software inquiry proxy then, this inquiry proxy also comprises the inquiry loop that the sheet head node chooses, arranged reliable ordinary node sign in the fooled anter in path in order
Step 5). inquiry proxy is visited ordinary node in the sheet successively according to the order of inquiring about the loop regulation, behind ordinary node of this agency's migration, presses following flow performing task:
A. obtain the information type that this node detects recently,, enter following steps d if inconsistent with the desired information type of inquiry, otherwise execution in step b,
B. extract the data of the nearest perception of this node, judge whether this numerical value reaches the threshold value of inquiry defined, promptly whether is necessary to note, if do not reach specified thresholds, enters steps d, otherwise execution in step c,
C. will act on behalf of the place node positional information P (x, y, z) and the data DATA that is consistent with search request form one two tuple (P DATA), is kept in the data space of this inquiry proxy,
D. the information finished on this node of inquiry proxy is obtained work, moves to the next node on the inquiry loop, is carrying out this flow process;
Step 6). inquiry proxy is after having traveled through all nodes of inquiry loop, get back to the sheet head node, if two tuples list that this agency preserved are not for empty, illustrate in the burst that this sheet head node administered the interested incident of user has taken place, the sheet head node extracts two tuples that all inquiry proxies are preserved, data to partial redundance are filtered, with the data encapsulation of putting in order in a new request broker, be used for sending the request of high speed data transfer, enter next step subsequently to user interface node; If two tuples list that inquiry proxy is preserved are empty, then the sheet head node is left intact, and only after spending a time interval, distributes new inquiry proxy more again, continue to begin to carry out from step 1), otherwise execution in step 7),
Step 7). the request broker that the sheet head node produces is by simple energy-conservation multi-hop routing mode, forwarding through relaying sheet head node, arrive user interface node, because the software mobile agent has intelligent, this request broker can independently be selected the sheet head node of next jumping, and specific strategy comprises following three part descriptions:
E. as previously mentioned, each sheet head node is all safeguarded the tabulation of neighbours' head nodal information, each list item comprise in have: neighbours' head node identification, neighbours' head residue energy of node E, neighbours' head node communication expense C (but intuitivism apprehension arrives the distance of user interface node for this sheet head node).
F. request broker obtains neighbours' head nodal information tabulation of this node after moving to a sheet head node, according to the dump energy and the communication overhead of all neighbours' head, picks out the sheet head node that next jumping of agency should be moved to,
G.NCL represents the tabulation of neighbours' head nodal information, neighbours' sheet head node N
iEnergy N
i(E) expression, communication overhead N
i(C) expression, next hop neighbor sheet head node N that request broker is selected
jShould satisfy following formula:
Wherein, k is a preassigned parameter, the significance level when being used to weigh communication overhead and energy and remaining in the request broker routing,
Step 8). request broker is finally moved to user interface node, and user interface node is extracting position information therefrom, and knows the situation in this sheet, and user interface node informs that the user sends hard agency to the zone of request high speed data transfer subsequently,
Step 9). the sheet head node interactive information of hard agency and fixed-site, and progressively close to target patch, this flow process is as described below:
H. after hard agency sets out, receive the message request (IM) that adjacent with it a plurality of head nodes send simultaneously,
I. judge the source position of coming of a plurality of IM, the immediate node of the target patch of adjusting the distance sends invitation response (IR), and close to this node,
J. repeated for two steps, constantly close to target patch, until the arrival destination,
Step 10). hard agency gets in touch with the sheet head node of target patch, obtain the information of all ordinary nodes in the sheet there from the sheet head node, adopt the simplest mechanism of inquiring after, ordinary node distributes a fixing communication time slot in the sheet of user interest information for each detects, obtain the useful data in this sheet at a high speed, and these data are sent to user interface node with the higher data transmission rate.
Beneficial effect: the inventive method has proposed a kind of wireless sensor network data transmission new method based on mixed mobile agent.The present invention adopts simple task to distribute in conjunction with hard agency and soft agency advantage separately, agency's migration, and data collection strategy, having realized transfer of data efficiently, had the following significant advantage, all is that other wireless sensor network data transmission method is not available at present for tradition:
(1) reduced the data volume in the net: wireless sensor network does not need to continue the data of sensor node collection are carried out high-speed transfer, in the overwhelming majority time, needs only the monitoring that keeps network.The present invention adopts the data transfer mode of each ordinary node in the software inquiry proxy traversal sheet, has significantly reduced the expense that sensor node carries out the duration data transmission.The software inquiry proxy can also carry out data necessary and filter and aggregation processing, picks out redundant information and hash, only necessary information is brought back to the sheet head node.When having guaranteed that the user can know situation in the sensor network coverage, greatly reduce the volume of transmitted data in the net.
(2) realized balance network load and the balance that reduces time delay: traditional wireless sensor network data transmission method often only adopts single performance as selecting the then standard in path, can cause the node energy approach exhaustion prematurely on one or several data transfer path of network like this, shorten the life-span of network.The present invention has taken all factors into consideration the energy residue and the communication overhead of node self, when selecting a quick transmission path, consider the balance of offered load again, make the energy that exhausts that node on the higher path of transmission rate can be not too early, increased the life cycle of network.
(3) reduced the great expense incurred of procotol: the present invention adopts hard agency's mode in high speed data transfer, because hard agency itself has the energy abundance, long transmission distance, the characteristic that disposal ability is strong, make its can be directly and sensor node and user interface node communicate.When communicating by letter with numerous sensor nodes, it takes simple inquiring method, avoided obtaining the channel right to use by competition ground mode between the sensor node, avoid the coordination of sequential between the node, especially in the mass data high-speed transfer, saved the communication overhead of complex network agreement.
(4) improved the transmission rate of critical data:, adopt the strong hard agency of communication capacity directly to obtain data, and send back user interface node from sensor node for the data that the user is concerned about.The data that changed sensor node acquisition in the past must arrive user interface node step by step through a certain complicated multi-hop routing policy.Thereby the present invention improved the transmission rate of critical data greatly, reduced the time delay of network.
(5) be applicable to the widespread usage of wireless sensor network more: most of application requirements network works of wireless sensor network are among abominable dangerous environment, and the more weak traffic handling capability of relatively poor link condition and node itself causes the speed of the transfer of data in the network generally very low.And the application of network is exactly and do not require that this kind network has very high data transmission rate---in the overwhelming majority, the user only need have a whole understanding to get final product to the situation in its overlay area by network, only after the user's interest incident has taken place, just be necessary to strengthen message transmission rate and reduce communication delay.The present invention utilizes the strategy of mixed mobile agent, takes different strategies in the different phase of network work, has satisfied the specific (special) requirements of wireless sensor network widespread usage to network effectively.
Description of drawings
Fig. 1 is the wireless sensor network system assumption diagram of burst.Shown the present invention based on the topological structure of wireless sensor network.
Fig. 2 is the schematic diagram that the software task agency distributes.Shown that the user is by the process of user structure node to the sheet head node assign task agency of each sheet.
Fig. 3 is the work schematic diagram of software inquiry proxy.The software inquiry proxy that expression sheet head node produces travels through the collection data in sheet.
Fig. 4 is software asks agency's a work schematic diagram.Need to have represented the sheet head node of high speed data transfer to produce request broker and select to arrive user interface node through multi-hop.
Fig. 5 is moving of hard agency and work schematic diagram.Having shown that hard agency navigates by the oneself arrives the process that high speed data transfer is carried out in the target area.
Embodiment
The step that data transmission method comprised of utilizing mixed mobile agent to carry out wireless sensor network is:
Step 1). all the sensors node in the burst exchanges information each other by simple neighbours HELLO agreement, comprises sign, the position, the energy field, each node all has one to safeguard a neighbor information table, is used for soft agency's migration and electing of sheet head node,
Step 2). exchange information between the sheet head node, each sheet head node is also safeguarded neighbours' head information table simultaneously, equally also comprises sign, the position, energy and communication overhead,
Step 3). user interface node is to all head intranodal inundation software tasks agency of network, and this agency is sheet assign tasks all in the network by simple inundation mode, and task agent can be according to need not the changing of user's request,
Step 4). the sheet head node is received task agent, extract task description, and preservation task agent, the task description that will extract before is encapsulated in the new software inquiry proxy then, this inquiry proxy also comprises the inquiry loop that the sheet head node chooses, arranged reliable ordinary node sign in the fooled anter in path in order
Step 5). inquiry proxy is visited ordinary node in the sheet successively according to the order of inquiring about the loop regulation, behind ordinary node of this agency's migration, presses following flow performing task:
A. obtain the information type that this node detects recently,, enter following steps d if inconsistent with the desired information type of inquiry, otherwise execution in step b,
B. extract the data of the nearest perception of this node, judge whether this numerical value reaches the threshold value of inquiry defined, promptly whether is necessary to note, if do not reach specified thresholds, enters steps d, otherwise execution in step c,
C. will act on behalf of the place node positional information P (x, y, z) and the data DATA that is consistent with search request form one two tuple (P DATA), is kept in the data space of this inquiry proxy,
D. the information finished on this node of inquiry proxy is obtained work, moves to the next node on the inquiry loop, is carrying out this flow process;
Step 6). inquiry proxy is after having traveled through all nodes of inquiry loop, get back to the sheet head node, if two tuples list that this agency preserved are not for empty, illustrate in the burst that this sheet head node administered the interested incident of user has taken place, the sheet head node extracts two tuples that all inquiry proxies are preserved, data to partial redundance are filtered, with the data encapsulation of putting in order in a new request broker, be used for sending the request of high speed data transfer, enter next step subsequently to user interface node; If two tuples list that inquiry proxy is preserved are empty, then the sheet head node is left intact, and only after spending a time interval, distributes new inquiry proxy more again, continue to begin to carry out from step 1), otherwise execution in step 7),
Step 7). the request broker that the sheet head node produces is by simple energy-conservation multi-hop routing mode, forwarding through relaying sheet head node, arrive user interface node, because the software mobile agent has intelligent, this request broker can independently be selected the sheet head node of next jumping, and specific strategy comprises following three part descriptions:
E. as previously mentioned, each sheet head node is all safeguarded the tabulation of neighbours' head nodal information, each list item comprise in have: neighbours' head node identification, neighbours' head residue energy of node E, neighbours' head node communication expense C (but intuitivism apprehension arrives the distance of user interface node for this sheet head node).
F. request broker obtains neighbours' head nodal information tabulation of this node after moving to a sheet head node, according to the dump energy and the communication overhead of all neighbours' head, picks out the sheet head node that next jumping of agency should be moved to,
G.NCL represents the tabulation of neighbours' head nodal information, neighbours' sheet head node N
iEnergy N
i(E) expression, communication overhead N
i(C) expression, next hop neighbor sheet head node N that request broker is selected
jShould satisfy following formula:
Wherein, k is a preassigned parameter, the significance level when being used to weigh communication overhead and energy and remaining in the request broker routing,
Step 8). request broker is finally moved to user interface node, and user interface node is extracting position information therefrom, and knows the situation in this sheet, and user interface node informs that the user sends hard agency to the zone of request high speed data transfer subsequently,
Step 9). the sheet head node interactive information of hard agency and fixed-site, and progressively close to target patch, this flow process is as described below:
H. after hard agency sets out, receive the message request (IM) that adjacent with it a plurality of head nodes send simultaneously,
I. judge the source position of coming of a plurality of IM, the immediate node of the target patch of adjusting the distance sends invitation response (IR), and close to this node,
J. repeated for two steps, constantly close to target patch, until the arrival destination,
Step 10). hard agency gets in touch with the sheet head node of target patch, obtain the information of all ordinary nodes in the sheet there from the sheet head node, adopt the simplest mechanism of inquiring after, ordinary node distributes a fixing communication time slot in the sheet of user interest information for each detects, obtain the useful data in this sheet at a high speed, and these data are sent to user interface node with the higher data transmission rate.
We further describe the present invention based on the example with next one supposition: develop a forest fire early warning based on wireless sensor network and use, adopt the data transmission method based on mixed mobile agent proposed by the invention, finish and realize the cable network monitoring, and the virgin forest that personnel are difficult for arriving carries out environmental monitoring effectively and fire alarm tracking being difficult to.
(1) arranges a large amount of wireless sensor nodes in the wood land by aircraft, form the burst network topology.All the sensors node in each burst identifies each other by simple neighbours HELLO agreement exchange, the position, and energy information by the maintenance of neighbor information table, is realized soft agency's migration and electing of sheet head node.
(2) exchange information between the sheet head node of each burst, each sheet head node is also safeguarded neighbours' head information table simultaneously, equally also comprises sign, position, energy and communication overhead.
(3) the forest zone administrative staff act on behalf of all sheet head node inundation software tasks in the established network by user interface node, and this acts on behalf of described task is " obtaining the zone that ambient temperature, smoke density etc. surpass predetermined threshold value ".User interface node is that sheets all in the network is assigned this task by simple inundation mode.
(4) the sheet head node of each burst of network is received this task agent, extracts task description, promptly " obtains the zone that ambient temperature, smoke density etc. surpass predetermined threshold value ", and preserves task agent.The task description that will extract before is encapsulated in the new condition of a fire inquiry proxy then, this condition of a fire inquiry proxy also comprises the inquiry loop that the sheet head node chooses, this loop has promptly covered the zone that this sheet covered, it is unreliable to have walked around those again, be that energy remains seldom the node that communication capacity is very weak.
(5) condition of a fire inquiry proxy is visited ordinary node in the sheet successively according to the order of inquiry loop regulation.Behind ordinary node of this agency's migration, press following flow performing task:
[1] obtains the information of types such as temperature that this node detects recently and smoke density,, enter [4] if there is not this type of information.Otherwise,
[2] extract the data of the nearest perception of this node, judge whether whether this numerical value reaches the threshold value of inquiry defined, promptly be necessary to note.If do not reach specified thresholds, enter [4].Otherwise,
[3] (z) and the environmental data DATA that is consistent with search request, (P DATA), is kept in the data space of this inquiry proxy to form one two tuple for x, y will to act on behalf of the positional information P of place node.
[4] information finished on this node of inquiry proxy is obtained work, moves to the next node on the inquiry loop, is carrying out this flow process.
(6) condition of a fire inquiry proxy is got back to the sheet head node after having traveled through all nodes of inquiry loop.If two tuples list that this agency preserved are not sky, the sign that fire is arranged in the burst that this sheet head node administered is described.The sheet head node extracts two tuples that all inquiry proxies are preserved, each regional temperature and smoke density value in this burst are analyzed and preliminary treatment, judge condition of a fire power, and later the information of will putting in order is encapsulated among the new data transfer request agency and goes, the request that this agency sends high speed data transfer to user interface node enters next step subsequently.If two tuples list that inquiry proxy is preserved are empty, then show not have condition of a fire sign in this sheet, after the sheet head node only needed a time interval, distribute new condition of a fire inquiry proxy more again.
(7) the data transfer request agency of sheet head node generation is by simple energy-conservation multi-hop routing mode, and the forwarding through relaying sheet head node finally will arrive user interface node.Because it is intelligent that the software mobile agent has, this request broker can independently be selected the sheet head node of next jumping, and specific strategy comprises following three part descriptions:
[1] each sheet head node is all safeguarded the tabulation of neighbours' head nodal information, each list item comprise in have: neighbours' head node identification, neighbours' head residue energy of node E, neighbours' head node communication expense C (but intuitivism apprehension arrives the distance of user interface node for this sheet head node).
[2] request broker obtains neighbours' head nodal information tabulation of this node after moving to a sheet head node.According to the dump energy and the communication overhead of all neighbours' head, pick out the sheet head node that next jumping of agency should be moved to.
[3] neighbours' sheet head node N is represented in the tabulation of neighbours' head nodal information with NCL
iEnergy N
i(E) expression, communication overhead N
i(C) expression.Next hop neighbor sheet head node N that request broker is selected
jShould satisfy following formula:
Wherein, k is a preassigned parameter, the significance level when being used to weigh communication overhead and energy and remaining in the request broker routing.
(8) the data transfer request agency is finally moved to user interface node, and user interface node is therefrom taken out the positional information that the condition of a fire takes place, and knows the general situation of the condition of a fire in this sheet, as degree, and spreading trend etc.User interface node informs that the user sends unmanned vehicle to the zone of request high speed data transfer subsequently, is used for the wood land that the condition of a fire takes place is carried out in real time, and monitoring exactly is so that allow the user obtain the most accurate fire information the most in time.
(9) aircraft is a unmanned machine, it can by with the sheet head node interactive information of fixed-site, progressively close to target patch.This flow process is as described below:
[1] after aircraft sets out, receives the message request (IM) that adjacent with it a plurality of head nodes send simultaneously.
[2] judge the source position of coming of a plurality of IM, the regional immediate node that the condition of a fire takes place of adjusting the distance sends invitation response (IR), and close to this node.
[3] repeated for two steps, constantly close to target patch, until arriving condition of a fire ground.
(10) the sheet head node of aircraft and condition of a fire spot is got in touch, and obtains the information of all ordinary nodes in the sheet there from the sheet head node.Adopt the simplest mechanism of inquiring after, ordinary node distributes a fixing communication time slot in the sheet of the condition of a fire for each detects.Obtain the condition of a fire related data in this sheet at a high speed, and these data are immediately sent to user interface node with the higher data transmission rate.
Claims (1)
1. wireless sensor network data transmission method based on mixed mobile agent is characterized in that the step that data transmission method comprised of utilizing mixed mobile agent to carry out wireless sensor network is:
Step 1). all the sensors node in the burst exchanges information each other by simple neighbours HELLO agreement, comprises sign, the position, the energy field, each node all has one to safeguard a neighbor information table, is used for soft agency's migration and electing of sheet head node,
Step 2). exchange information between the sheet head node, each sheet head node is also safeguarded neighbours' head information table simultaneously, equally also comprises sign, the position, energy and communication overhead,
Step 3). user interface node is to all head intranodal inundation software tasks agency of network, and this agency is sheet assign tasks all in the network by simple inundation mode, and task agent can be according to need not the changing of user's request,
Step 4). the sheet head node is received task agent, extract task description, and preservation task agent, the task description that will extract before is encapsulated in the new software inquiry proxy then, this inquiry proxy also comprises the inquiry loop that the sheet head node chooses, arranged reliable ordinary node sign in the fooled anter in path in order
Step 5). inquiry proxy is visited ordinary node in the sheet successively according to the order of inquiring about the loop regulation, behind ordinary node of this agency's migration, presses following flow performing task:
A. obtain the information type that this node detects recently,, enter following steps d if inconsistent with the desired information type of inquiry, otherwise execution in step b,
B. extract the data of the nearest perception of this node, judge whether this numerical value reaches the threshold value of inquiry defined, promptly whether is necessary to note, if do not reach specified thresholds, enters steps d, otherwise execution in step c,
C. will act on behalf of the place node positional information P (x, y, z) and the data DATA that is consistent with search request form one two tuple (P DATA), is kept in the data space of this inquiry proxy,
D. the information finished on this node of inquiry proxy is obtained work, moves to the next node on the inquiry loop, is carrying out this flow process;
Step 6). inquiry proxy is after having traveled through all nodes of inquiry loop, get back to the sheet head node, if two tuples list that this agency preserved are not for empty, illustrate in the burst that this sheet head node administered the interested incident of user has taken place, the sheet head node extracts two tuples that all inquiry proxies are preserved, data to partial redundance are filtered, with the data encapsulation of putting in order in a new request broker, be used for sending the request of high speed data transfer, enter next step subsequently to user interface node; If two tuples list that inquiry proxy is preserved are empty, then the sheet head node is left intact, and only after spending a time interval, distributes new inquiry proxy more again, continue to begin to carry out from step 1), otherwise execution in step 7),
Step 7). the request broker that the sheet head node produces is by simple energy-conservation multi-hop routing mode, forwarding through relaying sheet head node, arrive user interface node, because the software mobile agent has intelligent, this request broker can independently be selected the sheet head node of next jumping, and specific strategy comprises following three part descriptions:
E. as previously mentioned, each sheet head node is all safeguarded the tabulation of neighbours' head nodal information, each list item comprise in have: neighbours' head node identification, neighbours' head residue energy of node E, neighbours' head node communication expense C,
F. request broker obtains neighbours' head nodal information tabulation of this node after moving to a sheet head node, according to the dump energy and the communication overhead of all neighbours' head, picks out the sheet head node that next jumping of agency should be moved to,
G.NCL represents the tabulation of neighbours' head nodal information, neighbours' sheet head node N
iEnergy N
i(E) expression, communication overhead N
i(C) expression, next hop neighbor sheet head node N that request broker is selected
jShould satisfy following formula:
Wherein, k is a preassigned parameter, the significance level when being used to weigh communication overhead and energy and remaining in the request broker routing,
Step 8). request broker is finally moved to user interface node, and user interface node is extracting position information therefrom, and knows the situation in this sheet, and user interface node informs that the user sends hard agency to the zone of request high speed data transfer subsequently,
Step 9). the sheet head node interactive information of hard agency and fixed-site, and progressively close to target patch, this flow process is as described below:
H. after hard agency sets out, receive the message request (IM) that adjacent with it a plurality of head nodes send simultaneously,
I. judge the source position of coming of a plurality of IM, the immediate node of the target patch of adjusting the distance sends invitation response (IR), and close to this node,
J. repeated for two steps, constantly close to target patch, until the arrival destination,
Step 10). hard agency gets in touch with the sheet head node of target patch, obtain the information of all ordinary nodes in the sheet there from the sheet head node, adopt the simplest mechanism of inquiring after, ordinary node distributes a fixing communication time slot in the sheet of user interest information for each detects, obtain the useful data in this sheet at a high speed, and these data are sent to user interface node with the higher data transmission rate.
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