KR100667354B1 - Wireless sensor network for energy efficiency and communication method thereof - Google Patents

Abstract

According to the present invention, a plurality of sensing devices arranged in a specific place or an unspecified place are connected to a user who receives and processes information data from the sensing device through a wired or wireless network infrastructure, thereby preventing geographical, environmental, and social changes of the place. A wireless sensor network system for transmitting information data generated after detection and recognition to the user, and a method for installing and communicating a wireless sensor network for efficient operation of the system, the communication method comprising an ID means. In a wireless sensor network system where a plurality of nodes and an application including an ID reading module and a collecting node determining module communicate wirelessly through a base station, any node among the nodes having an ID and located in a predetermined area may be a collecting node. , The first collection node randomization node designates remaining node as sensing node. .; A signal transmitting step of collecting a signal transmitted from the deployed nodes in the collecting node, wherein the collecting node transmits the signal to the application to identify the location of the deployed node; Clustering the remaining nodes around the designated collection node as a sensing node; An event recognition step of detecting a change occurring in an area in which the nodes are arranged; An information data transmission step of transmitting information data of the detected event to the application by attaching an ID of the corresponding node; And the ID reading module reads the ID included in the received information data, and the collection node determining module selects one or more of the existing collection modules or sensing modules of the cluster and designates the cluster as a new collection node. It is a change phase.

Description

Wireless sensor network system and wireless sensor network communication method for improving efficiency of energy consumption

1 is a diagram illustrating a configuration between a node and a base station constituting a wireless sensor network system according to the related art and the present invention.

2 is a block diagram showing a wireless sensor network system according to the present invention,

3 is a flowchart sequentially showing an embodiment of a wireless sensor network communication method according to the present invention;

4 is a flowchart sequentially illustrating another embodiment of a wireless sensor network communication method according to the present invention;

5 is a view showing an implementation of the event recognition step according to the present invention,

6 is a view illustrating an implementation process of a collection node change step of a cluster according to the present invention;

7 is a diagram illustrating a configuration between a node and a base station in which a sector antenna is installed according to the present invention;

8 is a view showing an implementation of the reclustering step according to the present invention.

According to the present invention, a plurality of sensing devices arranged in a specific place or an unspecified place are connected to a user who receives and processes information data from the sensing device through a wired or wireless network infrastructure, thereby preventing geographical, environmental, and social changes of the place. The present invention relates to a wireless sensor network system for transmitting information data generated after detection and recognition to the user, and a method of installing and communicating a wireless sensor network for efficient operation of the system.

The development of communication technology has led to the creation of an environment in which a user can freely access the network regardless of a location without being aware of a computer or a network. This is known as ubiquitous and the recent researches in the field of communication technology are developing with the goal of incorporating such ubiquitous into real life.

The core technology of such ubiquitous is wireless sensor network system. The wireless sensor network system senses information such as geographical, environmental, and social changes while a sensing device (node) disposed in a specific place or an unspecified place independently operates in the place, and detects other sensing data in proximity to the detected information data. A device or a plurality of sensing devices are transmitted to clusters clustering within a designated range of space or to a base station which finally collects the information data.

In general, the sensing device may include a sensor for detecting various events occurring at a deployed place, a local storage module for identifying a current deployed place, and transmitting information data about the detected event or transmitted from a base station or another sensing device. A communication module for receiving information data, and a processor for calculating and processing the sensor, the local storage module, the communication module, and the like. The apparatus further includes a battery for supplying energy for driving the sensor, the local storage module, the communication module, the processor, and the like.

As described above, since the sensing device of the wireless sensor network system operates independently of other nodes or base stations in the battery, the amount of stored energy is finite. That is, the sensing device will be referred to as the life of the sensing device as long as there is no physical damage.

On the other hand, the main consumers of energy stored in the sensing device are sensing, processing, and communication, and among these, communication is a factor that consumes a relatively large amount of energy. Thus, frequent communication of sensing devices significantly shortens their lifespan, resulting in the need to install new sensing devices.

In addition, there is no guarantee that multiple sensing devices placed in a particular or unspecified location consume energy evenly. That is, in some places, the number of driving of the sensing device is increased due to frequent occurrence of an event, while in some places, the driving frequency of the sensing device arranged in the corresponding place is reduced due to the occurrence of a relatively small event, resulting in a difference in energy consumption.

Therefore, a plurality of sensing devices distributed in any zone individually end their lifespan, resulting in a shortage of sensing devices, and as a result, there is a sensing device that is currently running because the wireless sensor network does not achieve the purpose for which it is installed. In spite of this, the new sensing device has to be installed.

The above-described problems of the wireless sensor network system can be briefly compressed into two types, the first of which is to extend the life of the sensing device by reducing the energy consumption as much as possible, and the second is to provide even energy for the sensing devices. By consuming, it is possible to economically and efficiently use the wireless sensor network system.

Accordingly, the present invention has been made to solve the above problems, so that a plurality of sensing devices forming a cluster can increase the efficiency of the wireless sensor network system through an equal energy consumption and extend the life of the configured sensing device as much as possible. An object of the present invention is to provide a wireless sensor network system and a wireless sensor network communication method.

In order to achieve the above object, the present invention,

The wireless sensor network system includes a plurality of sensing nodes and a collection node configured to collect information data transmitted from the sensing nodes, and a clustered cluster, and an application for receiving the information data transmitted from the collection nodes through a base station. In

The sensing node and the collecting node further include ID means for attaching an ID of the corresponding node to the information data transmitted to the application;

The application, the ID reading module for reading the ID attached to the information data to identify the originating node of the information data, and the collection node type to select a new node of the existing collection node and sensing nodes in the same cluster In addition, the existing collection node is a wireless sensor network system further includes a collection node determination module for changing the protocol into a sensing node type.

The wireless network network system according to the present invention,

The base station includes a sector antenna wirelessly communicating with the collecting node located in a predetermined direction in a predetermined allocated area and a plurality of sectors are combined and implemented as multiple sectors.

In order to achieve the above object, the present invention,

In a wireless sensor network system in which a plurality of nodes including ID means and an application including an ID reading module and a collection node determination module communicate wirelessly through a base station,

A node ID input step of setting and inputting IDs to the nodes, respectively;

An initial collecting node random designating step of designating a node having any ID among the nodes arranged in a predetermined area as a collecting node and remaining nodes as a sensing node;

A signal transmitting step of collecting a signal transmitted from the deployed nodes in the collecting node, wherein the collecting node transmits the signal to the application to identify the location of the deployed node;

Clustering the remaining nodes around the designated collection node as a sensing node;

An event recognition step of detecting a change occurring in an area in which the nodes are arranged;

An information data transmission step of transmitting information data of the detected event to the application by attaching an ID of the corresponding node; And,

The ID reading module reads an ID included in the received information data, and the collecting node determining module selects one or more of the existing collecting modules or sensing modules of the cluster to designate a new collecting node. ;

Wireless sensor network communication method.

The wireless sensor network communication method according to the present invention,

The collecting node change step

When the current collection module of the cluster communicates with the application more than the specified number of times, the collection node determination module is driven.

The wireless sensor network communication method according to the present invention,

The collecting node change step

In designating a new collection node, a neighbor node search step of searching for nodes adjacent to the current collection module of the cluster;

A random node selection step of selecting at least one of nodes searched through the searching step and attempting to change a protocol for performing a function as a collecting node; And,

Protocol change step of attempting to change the protocol for the sensing node of the existing collecting node;

Is to be included more.

The wireless sensor network communication method according to the present invention,

Remaining battery level checking step of receiving information data on the remaining battery level from the nodes in the cluster to determine the remaining amount;

A node selecting step of selecting one or more nodes having the highest remaining battery level among the nodes identified through the checking step, and attempting to change a protocol for performing a function as a collecting node;

Protocol change step of attempting to change the protocol for the sensing node of the existing collecting node;

Is to be included more.

The wireless sensor network communication method according to the present invention,

In order to arbitrarily change the collection node specified in the initial collection node arbitrary designation step, the designated collection node is a sensing node, and the selected sensing node is a collection node, further comprising a collection node resetting step of attempting to change a protocol for performing its function. It is.

The wireless sensor network communication method according to the present invention,

In order to reconfigure the existing cluster in response to the state change of the cluster due to network loss, addition, replacement, etc. of the node, a reclustering step for repeatedly performing the initial collection node randomization step, signal transmission step, and clustering step is further included. will be.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram illustrating a configuration between a node and a base station constituting a wireless sensor network system according to the related art and the present invention.

A wireless sensor network including a wireless sensor network system according to the present invention as well as a conventional wireless sensor network is generally configured as shown in (a) and (b) of FIG. 1. That is, one or more clusters 10, 20, 30 communicate with the application 50 (see FIG. 2) via one or more base stations 40, and the nodes constituting the clusters 10, 20, 30 are arranged correspondingly. Detect the event caused by the geographical, environmental, and social change in the area and transmits it to the application 50.

In this case, the node detects an event detected by a sensing device (hereinafter referred to as a sensing node) and the sensing node (110 to 140, 210 to 240, 310 to 340, hereinafter referred to as 110, 210, and 310 million representatives). Collecting nodes (100, 200, 300) for collecting the information data of the event and transmits to the base station (40). The collection nodes 100, 200, and 300 may include sensing functions of the sensing nodes 110, 210, and 310.

The nodes are divided into sensing nodes 110, 210, and 310 and collecting nodes 100, 200, and 300, and clusters 10, 20, and 30 configure a wireless sensor network configured to operate collectively within a predetermined area. It is called.

In general, when the sensing nodes 110, 210, and 310 detect an event, the clusters 10, 20, and 30 may collect information data about the event. 200, 300, and the collection node 100, 200, 300 transmits the information data to the base station 40.

In addition, as shown in (b), a plurality of small clusters 11, 12, 13 are included in one cluster 10, and the collection node (11, 12, 13) is included in the small clusters 11, 12, 13; 100, 200, 300 and sensing nodes 110, 210, and 310 are configured, and information data about an event is transmitted to the base station 40 through communication between the collection nodes 100, 200, and 300.

A wireless sensor network system and a wireless sensor network communication method according to the present invention will be described based on the wireless sensor network constituting such a configuration.

2 is a block diagram illustrating a wireless sensor network system according to the present invention.

The wireless sensor network system according to the present invention comprises a cluster consisting of a plurality of sensing nodes 110 and a collection node 100 for collecting information data transmitted from the sensing nodes 110, and the collection node. In the wireless sensor network system including the application 50 for receiving the information data transmitted from the (100) via the base station 40, the sensing node 110 and the collecting node 100, the application 50 ID means (104a, 104a ') for attaching the ID of the node to the information data to be transmitted to; The application 50, the ID reading module 52 for reading the ID attached to the information data to check the originating node (100, 110) of the information data, the existing collection node 100 and the same cluster in the same; The collection node determination module 53 for selecting a new collection node among the sensing nodes 110 is further included.

A wireless sensor network system including a conventional cluster includes a sensor (102, 102 ') for detecting an event, a local storage module (103, 103') for identifying a current position, the sensor (102, 102 ') and a local Processors 104 and 104 'for controlling the storage modules 103 and 103', Communication modules 101 and 101 'for wireless communication with the base station 40, Sensors 102 and 102' and the local storage module. A plurality of nodes (100, 110) having batteries (105, 105 ') for supplying driving energy to (103, 103'), processors (104, 104 '), and communication modules (101, 101'); Communication module 51 for receiving the information data transmitted from the nodes (100, 110) through the base station 40, and the position for checking and managing the position of the nodes (100, 110) included in the information data An application 50 is provided with a confirmation module 55 and a control module 54 for controlling the communication module 51 and the positioning module 55.

The wireless sensor network system according to the present invention further includes ID means 104a and 104a 'at each node 100 and 110, and the application 50 includes an ID reading module 52 and a collection node determination module ( 53) is further included.

The ID means 104a and 104a 'attach the ID to the data upon data transmission to another node or the base station 40 while managing the IDs assigned to the nodes 100 and 110. In addition, through the ID means 104a and 104a ', the application 50 may search for and control and manage the nodes 100 and 110 distributed in a regular or irregular manner.

On the other hand, the application 50 is in communication with the base station 40 via a wired / wireless communication network, and finally in communication with the nodes (100, 110). The application 50 according to the present invention further includes an ID reading module 52 and a collection node determination module 53.

The ID reading module 52 detects and reads the IDs of the nodes 100 and 110 from the information data transmitted from the nodes 100 and 110 so that the source of the information data can be confirmed in detail. Enables communication from the application 50 to a specific node 100, 110 designated.

The collection node determination module 53 allows the collection node 100 constituting the cluster to be designated by the application 50 through a computing or artificial method, and is arranged in a remote location in conjunction with the ID reading module 52. Manage a plurality of nodes (100, 110).

The collection node determination module 53 will be described below while describing the wireless sensor network communication method according to the present invention.

The withdrawn reference numerals "106, 106" are the amount of battery detection module to check the remaining amount of the battery 103 for supplying energy to drive the nodes (100, 110) through the base station 40 through the application (50) ).

Therefore, the system according to the present invention can determine the amount of battery each configured in the plurality of nodes (100, 110) arranged in the application 50.

3 is a flowchart sequentially illustrating an embodiment of a wireless sensor network communication method according to the present invention.

Wireless sensor network communication method according to the present invention is carried out through the following process.

A wireless sensor network in which a plurality of nodes 100 and 110 including ID means and an application 50 including an ID reading module 52 and a collecting node determination module 53 communicate wirelessly through a base station 40. In the system,

S10; A node ID input step of setting and inputting IDs to the nodes 100 and 110, respectively;

The nodes 100 and 110 are each set with an ID for distinguishing the corresponding node as the source when transmitting the detected event to the base station 40 as the information data. Therefore, the ID of the node is included in the header of the transmitted information data. In general, since the ID is for distinguishing a plurality of deployed nodes, it may be possible with a minimum record for identifying the nodes. In addition, it is desirable to reduce the amount of data in order to minimize the amount of battery consumed during data transmission.

For example, when 1000 nodes 100 and 110 need to be arranged in a certain area, 0001 to 1000 may be designated as IDs of the nodes.

S20; An initial collection node random designation step of designating a node having any ID among the nodes 100 and 110 disposed in a predetermined area as a collection node 100 and remaining nodes as a sensing node;

A plurality of nodes (100, 110) are arranged in a certain area to be observed to form a wireless sensor network. At this time, in the wireless sensor network system according to the present invention, since the nodes 100 and 110 perform the functions of the sensing node as well as the sensing node, the collection node and the sensing node can be clearly distinguished in the initial installation process as in the conventional wireless sensor network. no need. Therefore, in initial deployment of the node, the administrator must designate as many collection nodes as the number of clusters to be configured among the deployed nodes 100 and 110.

For example, in the case of forming 10 clusters while arranging 1000 nodes 100 and 110, 100 nodes are configured for each cluster and at least one collecting node is set in each cluster, resulting in 10 collections. This is done by specifying a node. In this case, the nodes 100 and 110 to be arranged may be arranged at a predetermined position, and as a result, the distribution may be determined. In addition, the fixed position of the collection node is preferably located at the center of the sensing node constituting the cluster to efficiently communicate between the base station 40 and the node.

S30; The collection node 100 collects signals transmitted from the deployed nodes 100 and 110, and the collection node 100 checks the positions of the nodes 100 and 110 in which the application 50 is disposed. Signal transmission step of transmitting the signal to the application (50) to be able to;

After the nodes 100 and 110 are arranged in a certain area, when the collecting node 100 is determined, the nodes 100 and 110 transmit a signal to confirm whether the arrangement of the nodes 100 and 110 is successful.

The signals 100 and 110 are transmitted so that the application 50 recognizes that the installation of the nodes 100 and 110 is normally performed, and is transmitted to the base station 40 through the first collecting node 100 of each cluster. . Of course, the signal is transmitted to the application 50 through the base station 40.

S50; A clustering step of grouping the remaining nodes around the designated collection node 100 as the sensing node 110;

When the collecting node 100 is designated, nodes distributed around the collecting node 100 perform the function as the sensing node 110. In addition, a plurality of sensing nodes distributed using the collection node 100 as a communication medium are clustered in one group.

As a result, various events occurring in the area under the jurisdiction of the clustered nodes 100 and 110 are detected by the cluster, and information data about the event is transmitted to the base station 40 through the collection node 100 of the cluster. do.

S60; An event recognition step of detecting a change occurring in a region where the nodes 100 and 110 are arranged;

When an event occurs in the zone of the cluster, the nodes 100 and 110 detect the event. The type of the event may vary.

For example, environmental factors that detect the presence of temperature, humidity, movement, sound, light, or objects, physiological monitoring, monitoring of air, water, soil, chemicals, etc. Geophysical monitoring, animal monitoring, and habitat monitoring.

S70; An information data transmission step of transmitting information data of the detected event to the application by attaching an ID of the corresponding node;

The information data detected by the nodes 100 and 110 is transmitted by attaching an ID of the sensing node 110 or the collection node 100 that detects the information data to a header. In addition, the collecting node 100 receiving the information data attaches its ID to the information data including the header and transmits the ID to the base station 40.

S80; The ID reading module 52 reads an ID included in the received information data, and the collection node determination module 53. selects one or more of the existing collection modules or sensing modules of the cluster as a new collection node. Designating a cluster collection node;

Since the information data transmitted from the collection node 100 includes the ID of the sensing node 110 of the collection node 100, the application 50 that receives the information of the information data through the ID reading module 52 You can track the source.

For example, an ID of an arbitrarily designated collection node among 1000 nodes 100 and 110 disposed in a predetermined area is '0200', and corresponding information among sensing nodes 110 in a cluster, which is a communication medium with the base station 40. If the ID of the sensing node that detects the data is '0123', the data of '0123' is attached to the header of the information data detected by the sensing node, and the collection node 100 receiving the data node receives the header of the information data. The data '0200' is appended to. As a result, the ID reading module 52 of the application 50 that receives the information data can check the origin of the information data being received through '0200' and '0123' attached to the header.

The collecting node 100 should consume a lot of energy when receiving the information data from the sensing node 110 and transmitting it to the base station 40. Therefore, when the collecting node 100 is fixed, the battery of the collecting node 100 will have a larger consumption than that of the sensing node 110, and thus the life thereof will be shortened.

In the wireless sensor network communication method according to the present invention, the collection node determination module 53 changes the collection node 100 when the collection node 100 attempts to communicate with the base station 40 more than a specified number of times. do.

As a result, the existing collecting node is converted into a sensing node, and the sensing node selected through the collecting node determination module 53 will perform its function as a new collecting node of the cluster.

The node may be converted into a sensing node and a collecting node by changing a protocol of a communication layer. That is, the sensing node and the collecting node constituting the cluster can transmit bidirectional communication, but in the case of the collecting node, the corresponding information data should be sent to the base station 40 located in a relatively remote place. Should consume. Accordingly, the protocol of the nodes 100 and 110 governs the difference between the above-described collection node and the sensing node, and the collection node determination module 53 selects one of the nodes existing in the cluster as the next collection node. To change the protocol.

5 is a view illustrating an implementation process of an event recognition step according to the present invention.

In addition to the occurrence information on the geographical, environmental, and social change described above, the event may be such as to confirm that a new node is identified or lost in the cluster. As described above, the main factor in energy consumption of the collection node 100 is telecommunications. Therefore, the change criterion of the collecting node 100 will be the number of times the event is transmitted to the base station 40 as information data regardless of the detected event.

On the other hand, the new node is newly placed to reinforce the shortage of nodes in the cluster, and since a plurality of nodes cannot end their life at the same time, a new node can be installed in place of the node whose life has expired.

The new node transmits a signal at the same time as the deployment, and the neighboring collection node receives the signal and transmits it to the application 50. The application 50 receives this, registers a new node, and incorporates it into the corresponding cluster.

As described above, the collection module 100 of the cluster should attempt communication with the base station 40 in order to detect according to the occurrence of an event, to confirm the loss of a node, and to identify a new node. It becomes a requirement of.

6 is a view illustrating an implementation process of a collection node change step of a cluster according to the present invention.

The collection node determination module 53 searches for a new node to replace the current collection node 100.

As a reference, the sensing node 110 adjacent to the current collection node 100 will be used. This will be described with reference to (a) drawing.

S81; In designating a new collection node, a neighbor node search step of searching for nodes adjacent to the current collection module of the cluster;

The sensing node 110 adjacent to the current collecting node 100 is searched. Since information on each location of the nodes 100 and 110 is already managed by the application 50, the sensing node 110 adjacent to the current collection node 100 can be easily obtained.

S82; A random node selection step of selecting at least one of nodes searched through the searching step and attempting to change a protocol for performing a function as a collecting node; And,

One or more of the retrieved nodes are selected to perform a function as the collecting node 100. As described above, the conversion from the collecting node to the sensing node and the sensing node to the collecting node can be performed simply by changing the communication protocol.

S83; Protocol change step of attempting to change the protocol for the sensing node of the existing collecting node;

If the detected sensing node performs a function as a collecting node, the existing collecting node should be a sensing node. At this time, of course, it is possible to change the protocol of the node.

In addition, the following collection nodes can be selected in the following manner.

It demonstrates attaching drawing of FIG.

S81 '; Remaining battery level checking step of receiving information data on the remaining battery level from the nodes in the cluster to determine the remaining amount;

The nodes 100 and 110 according to the present invention include the battery amount sensing modules 106 and 106 ', and inform the application 50 of the amount of energy stored in the batteries 105 and 105' in real time or by request. Send it.

Through this, the amount of energy of the nodes 100 and 110 may be checked when the collection node is changed.

S82 '; A node selecting step of selecting one or more nodes having the highest remaining battery level among the nodes identified through the checking step, and attempting to change a protocol for performing a function as a collecting node;

The energy amount of the identified nodes (100, 110) is compared to determine the node storing the most energy in the cluster as the next collection node. In this case, too, the protocol is changed.

S83 '; Protocol change step of attempting to change the protocol for the sensing node of the existing collecting node;

Since it is the same as described above, the description thereof is omitted here.

4 is a flowchart sequentially illustrating another embodiment of a wireless sensor network communication method according to the present invention, and FIG. 7 is a view illustrating a configuration between a node and a base station in which a sector antenna is installed according to the present invention. .

The above-described embodiment is for the case where the nodes 100 and 110 constituting the cluster are fixed to the floating position at the position where the nodes are arranged. The wireless sensor network may be configured by forming the clusters in which the nodes are fluidly arranged.

In this case, the deployed nodes should be smoothly communicated with the fixed base station, and as shown in FIG. 7, the base station 40 may have a sector antenna installed therein.

The sector antenna can efficiently use channel resources in a wireless sensor network including a large number of clusters, and increase signal traffic and delay processing time by processing handoffs between soft sectors when communicating with a base station as nodes move. You can solve the problem.

Referring to the figure, the sector antenna according to the present invention partitions a space into sectors α, β, and γ, and communicates in real time with clusters 10, 20, 30, and 40 moving in the space. In this case, the movement of the clusters 10, 20, 30, and 40 means the movement of the nodes 100, 110, 200, 210, 300, 310, 400, and 410. As a result, the base station 40 'and Collecting nodes 100, 200, 300, 400 that communicate directly also vary continuously in position.

At this time, in order to facilitate the communication, the base station 40 ′ wirelessly communicates with the collecting nodes 100, 200, 300, and 400 located in a predetermined direction in a predetermined allocated area, and combines a plurality of sectors into multiple sectors. It includes a sector antenna to be implemented.

As shown in FIG. 4, another embodiment according to the present invention is as follows.

In the above-described embodiment, the arrangement of the nodes is fixed and there is no movement possibility, while the present embodiment is a communication method of a wireless sensor network in which the arrangement of nodes is flexible and the movement thereof is high.

As described above, the application 50 may check the positions of the nodes 100 and 110 arranged in the signal transmission step S30 of the node. This corresponds to both the previous embodiment without node mobility as well as this embodiment arranged in a way that is sprayed into the sea or implanted into an animal or the like.

By the way, the node to be a collection node is randomly determined before the node is arranged. Therefore, except when the administrator who installs the node directly arranges the nodes 100 and 110 evenly, if the nodes are randomly arranged, the randomly determined placement position of the collecting node may be inefficiently approached. Therefore, the application 50 may check the signal sent from the node to force the change of the collecting node later.

This is because inputting an ID to each node enables more accurate control of the node in the application 50.

Therefore, the administrator controlling the application 50 checks the position of the node according to the signal of the node and resets the collection node for efficient sensing. (S40, S41)

On the other hand, when the arrangement position of the nodes (100, 110) is flexible, a cluster in which a plurality of nodes are initially clustered may be distributed and mixed with other neighboring clusters, and the sensing node constituting the cluster is separated from the collecting node and is lost. Alternatively, it may add a load to the wireless sensor network system while communicating with a collection node of another cluster except for the collection node of the cluster to which the cluster belongs.

Therefore, in the wireless sensor network communication method according to the present invention, reclustering is performed based on a predetermined time or the number of times of communication between a collection node and a base station.

As shown in FIG. 4, whether the communication between the collection node 100 and the base station 40 has been more than a predetermined number of times, or reclustering (S90; see FIG. 8) through an 'A' process depending on whether a predetermined time has elapsed. If is determined, the process after 'B' is repeated if the target of reclustering.

According to the present invention as described above, as the ID is given to the node, it is possible to precisely control the application for each node, the energy consumption of the nodes constituting the cluster is more evenly adjusted and the life of the wireless sensor network as much as possible It can be extended.

In addition, it is possible to add or subtract nodes in the cluster, and to compensate for the lack of nodes for sensing, thereby overcoming the inefficiency of installing a new wireless sensor network due to partial loss of the wireless sensor network. .

In addition, since information for periodically changing the position of the collecting node in a specific direction at a specific time is known, energy efficiency can be improved by applying a sector antenna at the collecting node.

Claims (8)

The wireless sensor network system includes a plurality of sensing nodes and a collection node configured to collect information data transmitted from the sensing nodes, and a clustered cluster, and an application for receiving the information data transmitted from the collection nodes through a base station. In The sensing node and the collecting node further include ID means for attaching an ID of the corresponding node to the information data transmitted to the application; The application may read an ID attached to the information data and identify an originating node of the information data, and select an arbitrary node among existing collection nodes and sensing nodes in the same cluster, A collecting node determining module for updating to a new collecting node; Wireless sensor network system, characterized in that. The method of claim 1, The base station is a wireless sensor network system, characterized in that it comprises a sector antenna that is wirelessly communicated with the collecting node located in a predetermined direction in a predetermined allocated area and a plurality of them are combined into multiple sectors. In a wireless sensor network system in which a plurality of nodes including ID means and an application including an ID reading module and a collection node determination module communicate wirelessly through a base station, An initial designation node random designation step of designating any node among nodes having an ID as a collecting node and remaining nodes as a sensing node; A signal transmitting step of collecting a signal transmitted from the deployed nodes in the collecting node, wherein the collecting node transmits the signal to the application to identify the location of the deployed node; Clustering the remaining nodes around the designated collection node as a sensing node; An event recognition step of detecting a change occurring in an area in which the nodes are arranged; An information data transmission step of transmitting information data of the detected event to the application by attaching an ID of the corresponding node; And, The ID reading module reads an ID included in the received information data, and the collecting node determining module selects one or more of the existing collecting modules or sensing modules of the cluster to designate a new collecting node. ; Wireless sensor network communication method, characterized in that. The method of claim 3, wherein the collecting node change step And when the current collection module of the cluster communicates with the application more than a specified number of times, the collection node determination module is driven. The method of claim 3 or 4, wherein the collecting node change step is performed. In designating a new collection node, a neighbor node search step of searching for nodes adjacent to the current collection module of the cluster; A random node selection step of selecting at least one of nodes searched through the searching step and attempting to change a protocol for performing a function as a collecting node; And, Protocol change step of attempting to change the protocol for the sensing node of the existing collecting node; Wireless sensor network communication method characterized in that it further comprises. The method according to claim 3 or 4, Remaining battery level checking step of receiving information data on the remaining battery level from the nodes in the cluster to determine the remaining amount; A node selecting step of selecting one or more nodes having the highest remaining battery level among the nodes identified through the checking step, and attempting to change a protocol for performing a function as a collecting node; Protocol change step of attempting to change the protocol for the sensing node of the existing collecting node; Wireless sensor network communication method characterized in that it further comprises. The method according to claim 3 or 4, In order to arbitrarily change the collection node specified in the initial collection node arbitrary designation step, the designated collection node is a sensing node, and the selected sensing node is a collection node, further comprising a collection node resetting step of attempting to change a protocol for performing its function. Wireless sensor network communication method, characterized in that. The method according to claim 3 or 4, In order to reconfigure the existing cluster in response to the state change of the cluster due to network loss, addition, replacement, etc. of the node, a reclustering step for repeatedly performing the initial collection node randomization step, signal transmission step, and clustering step is further included. Wireless sensor network communication method, characterized in that.

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