KR101064172B1 - Sensor network system and data transmission control method in sensor network - Google Patents

Abstract

A sensor network system and a method of controlling data transmission in a sensor network are disclosed. N ₂ in the sensor network system can receive the data collected from existing on the sensor field, separated by N ₁ of the cluster, and said N ₁ of the cluster to form the N ₁ of the cluster and the tree topology, respectively Management nodes, the sensor field being partitioned into N ₂ sub sensor fields comprising a plurality of clusters, the N ₂ management nodes being in each of the N ₂ sub sensor fields; And a mobile sink node moving on the sensor field and receiving the collected data, wherein the mobile sink node is located in an inner region of a first sub sensor field among the N ₂ sub sensor fields. The first management node present in the first sub sensor field forms the first tree topology with the N ₁ clusters to receive the collected data, transmit the collected data to the mobile sink node, and move the mobile node. The sink node receives the collected data transmitted from the first management node.

Sensor Network, Mobile Sink Node, Multi-Sink, Tree Topology, Handover

Description

Sensor network system and method for controlling data transmission in sensor network system

One embodiment of the present invention relates to a sensor network system and a method for controlling data transmission in a sensor network system, and more particularly, a sensor network system capable of performing seamless data transmission to a mobile sink node moving on a sensor field; The present invention relates to a data transmission control method in a sensor network system.

In general, a sensor network system refers to a network system in which a plurality of sensors are distributed and networked, a variety of data sensed by the sensors are collected and processed, and transmitted to a manager.

In general, a sensor network system includes a plurality of sensor nodes for sensing specific data and a sink node for collecting sensed data (sensing data). The sensing data collected at the sink node is connected to a legacy network including an IP based network through a gateway, and thus a user may receive the sensed data.

At this time, the sink node receives the sensing data from the plurality of sensor nodes according to a specific routing protocol. For example, the sink node may receive sensing data from a plurality of sensor nodes using a direct diffusion protocol, a GRAB protocol, or the like. However, such a routing protocol has been studied based on sensor nodes that collect information at fixed locations, and thus there is a problem that it is not efficient in a large sensor network using a plurality of mobile sink nodes.

In order to solve the above problem, a two-tier data dissemination (TTDD) protocol and the like have been proposed, but the TTDD protocol and the like have only proposed a method for establishing a connection from the mobile sink node to the sensor node, and the mobile sink node from the sensor node. There was no solution for establishing a connection to a network.

In order to solve the problems of the prior art as described above, in the large-scale sensor network system including a plurality of sensor nodes and a mobile sink node, even if the mobile sink node is moved from the plurality of sensor nodes The present invention proposes a sensor network system and a data transmission control method in a sensor network system that allow a mobile sink node to seamlessly receive sensing data.

In order to achieve the above object, according to a preferred embodiment of the present invention, the N ₁ cluster is present on a sensor field divided by N ₁ clusters and forms a tree topology with the N ₁ clusters. N ₂ management nodes capable of receiving data collected at each of the two sensor nodes, wherein the sensor field is partitioned into N ₂ sub sensor fields including a plurality of clusters, and the N ₂ management nodes are divided into the N ₂ sub nodes. Present in each sensor field; And a mobile sink node moving on the sensor field and receiving the collected data, wherein the mobile sink node is located in an inner region of a first sub sensor field among the N ₂ sub sensor fields. The first management node present in the first sub sensor field forms the first tree topology with the N ₁ clusters to receive the collected data, transmit the collected data to the mobile sink node, and move the mobile node. A sink node is provided with a sensor network system that receives the collected data transmitted from the first management node.

In this case, when the mobile sink node enters a boundary region between the first sub sensor field and the second sub sensor field adjacent to the first sub sensor field, a second management node existing in the second sub sensor field. Forms a second tree topology with the N ₁ clusters to receive the collected data, transmit the collected data to the mobile sink node, and the mobile sink node is transmitted from the second management node. The collected data may be further received.

In addition, when the mobile sink node enters an inner region of the second sub sensor field from a boundary area between the first sub sensor field and the second sub sensor field, the first management node is configured to enter the first tree. The topology may be released to stop transmission of the collected data to the mobile sink node.

Further, according to another embodiment of the present invention, in a sensor network system including a mobile sink node that receives data collected from N ₁ clusters present in a sensor field, each of the N ₂ sub sensor fields is present. And N ₂ management nodes capable of receiving the collected data from the N ₁ clusters and transmitting the collected data to the mobile sink node, wherein the first management node of any one of the N ₂ management nodes includes: When the mobile sink node is located in an inner region of a first sub sensor field where a first management node exists or in a boundary region of the first sub sensor field, the collected data is received from the N ₁ clusters. A sensor network system is provided for transmitting to a mobile sink node.

Further, according to another embodiment of the present invention, a method for transmitting data collected in N ₁ clusters existing on a sensor field to a mobile sink node moving on the sensor field-the N ₂ sub Each sensor field includes one management node, wherein a first management node and the N ₁ clusters present in a first sub sensor field in which the mobile sink node is located among the N ₂ sub sensor fields are located in a first tree. Forming a topology; Receiving, by the first management node, the collected data from the N ₁ clusters through the first tree topology to the mobile sink node; And receiving, by the mobile sink node, the collected data transmitted from the first management node. .

According to the present invention, in a large sensor network system including a plurality of sensor nodes and a mobile sink node, even when the mobile sink node moves, the mobile sink node can seamlessly receive sensing data from the plurality of sensor nodes. It becomes possible.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In order to facilitate a thorough understanding of the present invention, the same reference numerals are used for the same means regardless of the number of the drawings.

1 is a block diagram showing a detailed configuration of a sensor network system according to an embodiment of the present invention.

Referring to FIG. 1, the sensor network system 100 includes N ₁ clusters 111 to 115, N ₂ management nodes 121 to 124, and a mobile sink node 130. It may include. Hereinafter, the function of each component will be described in detail (here, N ₁ And N ₂ is a predetermined integer of 2 or more).

N ₁ clusters 111 to 115 exist on the sensor field, and each of N ₁ clusters 111 to 115 includes a plurality of sensor nodes. Each of the plurality of sensor nodes senses data about temperature, humidity, vibration, etc. in a specific region, and each of the N ₁ clusters 111 to 115 collects data sensed by the plurality of sensor nodes.

At this time, N ₁ of the cluster (111 to 115) each of which includes one of the head node (Head Node) (that is, the cluster head node), a plurality of sensor nodes transmit the sensed data (sensed data) to the head node Can be. In this case, the head node is a sensor node of any one of the plurality of sensor nodes, and may be a sensor node having a larger transmission power than other sensor nodes.

N ₂ managed nodes (121 to 124) receives the sensing data collected by the N ₁ of the cluster (111 to 115), and transmits it to the mobile sink node 130 moving on the sensor field. That is, the management nodes 121 to 124 transmit the data sensed by the plurality of sensor nodes existing on the sensor field to the mobile sink node 130 moving on the sensor field.

At this time, the sensor field is divided into N ₂ sub-field sensor, N ₂ and each of the managed node (121 to 124) are each positioned on the N ₂ sub-field sensor. That is, one management node exists in one sub sensor field.

Each of the N ₂ management nodes 121 to 124 present in the N ₂ sub-sensor fields is located in each of the N ₁ clusters when the mobile sink node 130 is located in an inner region of the sub sensor field in which it exists. The collected data are received from the N ₁ clusters and delivered to the mobile sink node 130. That is, N ₂ managed nodes 121-124 manages the transfer of data to the mobile sink node 130 moving the sink node 130 in response to the movement of the.

In this case, N ₂ of the managed node (121 to 124) each having a greater transmission power (the transmission distance) to the extent that can send data to any point in the sub-field area.

Further, in a mobile sink node 130 is present in the sub-sensor field to the location management node of the N ₁ of the cluster (111 to 115) and form a tree topology, the N ₁ clusters through which (111 to 115) Receive each collected data. If each of the N ₁ clusters 111 to 115 includes a head node, the management node present in the sub sensor field where the mobile sink node 130 is located forms a tree topology with the N ₁ head nodes. Receive the collected data.

Hereinafter, an operation of receiving, by a mobile sink node, data collected in a plurality of clusters from any one management node according to an embodiment of the present invention will be described in detail with reference to FIGS. 2 to 3.

First, FIG. 2 is a diagram illustrating an example of a sensor field partitioned into a plurality of sub sensor fields according to an embodiment of the present invention.

The sensor field 200 in which data is sensed by the plurality of sensor nodes 222 is divided into nine sub sensor fields 210, as shown in FIG. 2, and each sub sensor field 210 is represented. May include four clusters 220. At this time, each of the clusters 220 includes a plurality of sensor nodes 222 and one head node 221, the plurality of sensor nodes 222 and one head node 221 is a tree topology ( Configure Tree Topology. The head node 221 collects data sensed by the plurality of sensor nodes 222 through a path according to a tree topology.

In FIG. 2, the sensor field is divided into nine sub sensor fields 210 including four clusters 220, but the number of sub sensor fields 210 and each sub sensor field 210 are divided. The number of clusters 220 included in may be changed, and the number of clusters 220 included in each sub sensor field 210 may be different from each other.

Next, FIG. 3 is a diagram illustrating a tree topology in which a plurality of clusters existing in a management node and a sensor field of a plurality of management nodes form a tree topology according to an embodiment of the present invention, and transmits collected data to a mobile sink node. It is a figure for demonstrating the operation | movement.

First, referring to FIG. 3A, one management node exists in each of the nine sub sensor fields 310, and the mobile sink node 360 moves on the sensor field 300 while the head node ( Receive data collected at nine clusters 320 via 321.

At this time, since the mobile sink node 360 is located in an inner region of the subsensor field 7 in which the management node 341 is located, the management node 341 is configured with 36 head nodes 321 and a tree. A topology is formed and data collected from 36 head nodes 321 are transmitted through a path 331 according to a tree topology. Thereafter, management node 341 transfers the collected data to the mobile sink node 360 through the path 351. The tree topology formed between the management node 341 and the 36 head nodes 321 may be represented in a vertical form as shown in FIG.

Referring back to Figure 2 will be described with respect to the sensor network system according to an embodiment of the present invention.

As mentioned above, the mobile sink node 130 receives data collected in N ₁ clusters while moving on the sensor field, if the mobile sink node 130 is adjacent to the second sub sensor field from the first sub sensor field. In this case, the first management node 121 existing in the first sub sensor field cannot transmit data to the mobile sink node 130 due to the limitation of the transmission power. Therefore, in this case, the mobile sink node 130 changes the transmitting end of the data to the second management node 122 present in the second sub sensor field to receive data collected from the N ₁ clusters.

In this case, the change of the data transmission end from the first management node 121 to the second management node 122 may be performed similarly to the handover operation performed when the mobile terminal moves the boundary area between cells. Can be.

That is, according to an embodiment of the present invention, when the mobile sink node 130 enters the boundary area between the first sub sensor field and the second sub sensor field, the second management node 122 may have N ₁ clusters. The new tree topologies may be formed with the nodes 111 to 115 to receive data collected from the N ₁ clusters 111 to 115, and the collected data may be transmitted to the mobile sink node 130. In this case, the mobile sink node 130 may simultaneously receive data transmitted from the first management node 121 and data transmitted from the second management node 122. Hereinafter, for convenience of description, a tree topology formed between the first management node 121 and the N ₁ clusters 111 to 115 is referred to as a “first tree topology”, and the second management node 122 and N _{1 are described.} A tree topology formed between the two clusters 111 to 115 will be referred to as a "second tree topology".

 According to an embodiment of the present invention, the inner area of the sub sensor field and the boundary area between two adjacent sub sensor fields may be changed according to the moving speed of the mobile sink node 130.

In other words, the faster the moving speed of the mobile sink node 130 is, the shorter the moving time of the mobile sink node 130 from the first sub sensor field area to the second sub sensor field area becomes, and thus, N ₁ clusters 111. In order to seamlessly receive the data collected in the first to 115th, a time point at which the mobile sink node 130 receives the data collected from the second management node should be earlier in proportion to the moving speed of the mobile sink node 130. Therefore, as the moving speed of the mobile sink node 130 increases, the inner area of the sub sensor field may be reduced, and the boundary area between adjacent sub sensor fields may be widened.

In addition, according to an embodiment of the present invention, the mobile sink node 130 may broadcast information about its movement to the second management node by broadcasting the first information message. In this case, the first information message may include at least one of the movement path information of the mobile sink node 130 and the ID of the mobile sink node 130.

As an example, the second management node 122 may receive a first information message from at least one cluster among a plurality of clusters included in the second sub sensor field. In this case, the at least one cluster receives the first information message from at least one sensor among the plurality of sensor nodes existing below it.

That is, the first information data broadcast from the mobile sink node 130 is received at at least one sensor node among the plurality of sensor nodes present in the second sub sensor field, and at least one of the first information data is received. The sensor node transmits the first information data received to the head node existing above it, and the head node received the first information data transmits the first information data received to the second management node 122. Accordingly, the second management node 122 can finally receive the first information data.

Upon receiving the first information message, the second management node 122 may generate a routing message for forming a second tree topology based on the first information message. In other words, when the second management node 122 receives the first information message, the second management node 122 recognizes that the mobile sink node 130 is going to move to the second subfield area to which it belongs, and forms a second tree topology. You can create a routing message to do this.

Thereafter, the second management node 122 transmits the generated routing message to the N ₁ clusters 111 to 115, and the second management node 122 and the N ₁ clusters 111 to 115 are routed. The second tree topology may be formed based on the message.

As an example, the second management node 122 may transmit a routing message to the N ₁ clusters 111 to 115 according to a flooding method. The flooding method is a data transmission method of delivering a message (or data) transmitted from one node to all other nodes connected to a router.

Hereinafter, referring to FIGS. 4 and 5, the mobile sink node 130 located in the boundary region of the sub sensor field receives data collected in N ₁ clusters from each of the first management node and the second management node. The operation will be described in more detail.

4 and 5 illustrate that when a mobile sink node moves between two adjacent subsensor fields, each of the two management nodes existing in the two subsensor fields is collected as the mobile sink node. It is a diagram for explaining the operation of transmitting the data.

First, FIG. 4 illustrates a situation in which the mobile sink node 360 moves from the seventh sensor field to the fourth sensor field.

As shown in FIG. 4, the mobile sink node 360 broadcasts the first information message to the sensor field, and the broadcasted first information message includes a plurality of sensor nodes 322 positioned in the fourth sensor field. Some of the sensor nodes 322, which are received at some of the sensor nodes 322 and have received the first information message, forward the first information message to their upper head nodes 321. The head nodes 321 which have received the first information message transmit the first information message to the management node 342. As an example, the head nodes 321 may periodically broadcast the first information message to the management node 342 four times.

Thereafter, management node 342 transmits a routing message to 36 head nodes 321 according to the flooding scheme to form a second tree topology with 36 head nodes 321. The 36 head nodes 321 form a second tree topology with the management node 342 4 based on the received routing message.

FIG. 5 illustrates a first tree topology formed between management node 341 and 36 head nodes 321 and a second tree topology formed between management node 342 and 36 head nodes 321. A sensor network system is shown.

As shown in FIG. 5A, when the mobile sink node 360 is located at a boundary area between the seventh sensor field and the fourth sensor field, the mobile sink node 360 enters the first tree topology. Data collected from the 36 head nodes 321 may be received through the path 331 according to the path 332 according to the second tree topology. The first tree topology and the second tree topology, which are formed redundantly between the management node 341 and the fourth node 342 and the 36 head nodes 321, are represented in a vertical form as shown in FIG. 5B. Can be.

Hereinafter, a sensor network system according to an embodiment of the present invention will be described with reference to FIG. 1 again.

When the mobile sensor node 130 receives data redundantly from the first management node 121 and the second management node 122, the N ₁ clusters 111 to 115 are paths according to the first tree topology. It is necessary to transmit the collected data to the first management node 121 through, and to transmit the collected data to the second management node 122 via a path according to the second tree topology.

Accordingly, according to an embodiment of the present invention, the N ₁ clusters 111 to 115 transmit data collected to the first management node 121 through a path according to the first tree topology at a first time interval. In the second time interval that does not overlap the first time interval, the collected data may be transmitted to the second management node 122 through a path according to the second tree topology.

6 is a diagram for describing a concept in which a first management node and a second management node receive data collected from a plurality of clusters at different time intervals, according to an embodiment of the present invention.

Referring to FIG. 6, when the mobile management node 130 is located in the inner region of the first management node (management node 7), clusters 111 to 115 of N ₁ may be represented by reference numeral 610. Likewise, the collected data is periodically transmitted only to the first management node (management node 7).

However, when the mobile sink node 130 is located in the boundary region of the first management node (management node 7) and the second management node (management node 4), N ₁ clusters 111 to 115 are collected. The first managed node 121 (7), as indicated by reference numeral 620, to periodically transmit the collected data to the first managed node (managed node 7) and the second managed node (managed node 4). First, the collected data is transmitted to the first management node, and after the time of T / 2 has elapsed, the collected data is transmitted to the second management node 122 (managed node 4) and repeatedly performed.

The mobile sink node 130 moving from the inner area of the first sub sensor field to the boundary area between the first sub sensor field and the second sub sensor field moves out of the boundary area and then moves out of the boundary area of the second sub sensor field. Enter the inner zone. When the mobile sink node 130 enters the inner region of the second sub sensor field, the mobile sink node 130 no longer needs to receive data collected from the first management node 121.

Thus, according to an embodiment of the present invention, when the mobile sink node 130 enters an inner region of the second sub sensor field out of the boundary area between the first sub sensor field and the second sub sensor field, The management node 121 may stop the transmission of the collected data to the mobile sink node 130 by releasing the first tree topology.

To this end, when the mobile sink node 130 enters the inner region of the second sub sensor field,

The mobile sink node broadcasts a second information message including at least one of release information of the first tree topology and an ID of the mobile sink node 130. The broadcasted second information message is received at the first management node 121, whereby the first management node releases the first tree topology to stop receiving data from the N ₁ clusters 111-115. . The broadcast of the second information message at the mobile sink node 130 and the reception of the second information message at the management node correspond to the broadcast of the first information message described above and the reception of the first information message at the management node. Detailed description thereof will be omitted.

According to an embodiment of the present invention, when the mobile sink node 130 is located in the boundary area, the mobile sink node 130 may receive data from three management nodes instead of two management nodes.

Referring to FIG. 5, the mobile sink node 130 is currently located in the seventh sub-sensor field (first sub-sensor field), and the fourth sub-sensor field (second sub-sensor field) and the fifth sub-sensor field later. Assuming that the moving sink node 130 is moved clockwise around the boundary line of the (third sub sensor field) and the speed of the moving sink node 130 is very fast, the mobile sink node 130 collects in the N ₁ clusters 111 to 115. In order to receive the received data seamlessly, the collected data must be received not only from the fourth management node (second management node) but also from the fifth management node (third management node).

Accordingly, when the mobile sink node 130 enters near the boundary of the first sub sensor field, the second sub sensor field, and the third sub sensor field located adjacent to each other, the second management node 122 may have N _{1 values.} The second tree topology is formed by forming the second tree topology with the clusters 111 to 115, and the collected data is transmitted to the mobile sink node 130, and the third management node 123 receives the N ₁ clusters 111 to 115. And a third tree topology to receive the collected data and transmit it to the mobile sink node 130, which further receives the data transmitted from the second management node and the third management node. can do.

In addition, according to an embodiment of the present invention, the N ₂ mobile sink nodes 130 may be any one head node among a plurality of head nodes included in a plurality of clusters positioned in the N ₂ sub sensor fields. Can be.

That is, the sensor network system 100 according to an embodiment of the present invention does not include a separate mobile sink node 130 and performs a role of the mobile sink node 130 by using some of the plurality of head nodes. can do.

In this case, since the head node corresponding to the mobile sink node 130 should be able to transmit data to all regions of the sub sensor field, according to an embodiment of the present invention, the head nodes corresponding to the mobile sink node 130 The transmission power (transmission distance) may be larger than other head nodes.

7 is a diagram illustrating an overall flow of a data transmission control method in a sensor network system according to an embodiment of the present invention.

Here, the sensor network system is the sensor network system shown in FIGS. 2 and 3. Hereinafter, a process performed at each step will be described with reference to FIG. 7.

In operation S710, the N ₁ clusters and the first management node existing in the first sub sensor field where the mobile sink node is located form a first tree topology.

In operation S720, the first management node receives data collected from the N ₁ clusters through the first tree topology and transmits the data to the mobile sink node.

In step S730, the mobile sink node receives the collected data from the first management node.

In operation S740, the mobile sink node enters a boundary area between the first sub sensor field and the second sub sensor field.

In operation S750, the second management node existing in the second sub sensor field forms a second tree topology with N ₁ clusters.

In step S760, the second management node receives the data collected through the second tree topology and transmits the data to the mobile sink node.

In step S770, the mobile sink node further receives the collected data from the second management node.

In step S780, the mobile sink node moves out of the boundary area between the first sub sensor field and the second sub sensor field and enters an inner area of the second sub sensor field.

In step S790, the first management node releases the first tree topology to stop transmission of the collected data to the mobile sink node.

Accordingly, the data transmission end to the mobile sink node is changed from the first management node to the second management node.

So far, embodiments of the data transmission control method in the sensor network system according to the present invention have been described, and the configuration of the sensor network system described above with reference to FIGS. 1 to 6 may be applied to the present embodiment as it is. Hereinafter, a detailed description will be omitted.

In addition, embodiments of the present invention may be implemented in the form of program instructions that may be executed by various computer means to be recorded on a computer readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. Program instructions recorded on the media may be those specially designed and constructed for the purposes of the present invention, or they may be of the kind well-known and available to those having skill in the computer software arts. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks, such as floppy disks. Examples of program instructions such as magneto-optical, ROM, RAM, flash memory, etc. may be executed by a computer using an interpreter as well as machine code such as produced by a compiler. Contains high-level language codes. The hardware device described above may be configured to operate as one or more software modules to perform the operations of one embodiment of the present invention, and vice versa.

As described above, the present invention has been described by specific embodiments such as specific components and the like. For those skilled in the art to which the present invention pertains, various modifications and variations are possible. Therefore, the spirit of the present invention should not be limited to the described embodiments, and all of the equivalents or equivalents of the claims as well as the claims to be described later will belong to the scope of the present invention. .

 1 is a block diagram showing a detailed configuration of a sensor network system according to an embodiment of the present invention.

2 is a diagram illustrating an example of a sensor field partitioned into a plurality of sub sensor fields according to an embodiment of the present invention.

FIG. 3 illustrates an operation of transmitting collected data to a mobile sink node by forming a tree topology of a plurality of clusters existing in one of a plurality of managed nodes and a sensor field according to an embodiment of the present invention. It is a figure for demonstrating.

4 and 5 illustrate that when a mobile sink node moves between two adjacent subsensor fields, each of the two management nodes existing in the two subsensor fields is collected as the mobile sink node. It is a diagram for explaining the operation of transmitting the data.

6 is a diagram for describing a concept in which a first management node and a second management node receive data collected from a plurality of clusters at different time intervals, according to an embodiment of the present invention.

7 is a diagram illustrating an overall flow of a data transmission control method in a sensor network system according to an embodiment of the present invention.

Claims (16)

Present on the sensor field, separated by N ₁ of the cluster, and to form the N ₁ clusters each including N ₁ of the head node of the tree topology in the data collected from the N ₁ clusters each N ₂ management nodes capable of receiving-the sensor field is partitioned into N ₂ sub sensor fields comprising a plurality of clusters, the N ₂ management nodes present in each of the N ₂ sub sensor fields Ham-; And A mobile sink node moving on the sensor field and receiving the collected data, When the mobile sink node located within the area of the first sub-sensor field from among the N ₂ sub sensor field, the first management node of the head node, the N ₁ present in the first sub-sensor field and the Form a one-tree topology to receive the collected data, send the collected data to the mobile sink node, And the mobile sink node receives the collected data transmitted from the first management node. delete The method of claim 1, When the mobile sink node enters the boundary region between the first sub sensor field and the second sub sensor field adjacent to the first sub sensor field, The second management node present in the second sub sensor field forms a second tree topology with the N ₁ head nodes to receive the collected data, transmit the collected data to the mobile sink node, And the mobile sink node further receives the collected data transmitted from the second management node. The method of claim 3, When the mobile sink node enters the boundary region between the first sub sensor field and the second sub sensor field, The mobile sink node broadcasts a first information message, And the first information message comprises at least one of movement path information of the mobile sink node and an ID of the mobile sink node. 5. The method of claim 4, The second management node receives the first information message, generates a routing message for forming the second tree topology based on the first information message, and sends the routing message to the N ₁ head nodes. Send, The second management node and the node N ₁ of the head are the sensor network system as to form a second tree topologies on the basis of the routing message. The method of claim 5, The second management node is Receiving the first information message from at least one head node included in at least one cluster among a plurality of clusters included in the second sub sensor field, Each of the at least one head node includes the first information from the at least one sensor node when at least one sensor node among the plurality of sensor nodes included in each of the at least one cluster receives the first information message. And receiving the message and transmitting the received first information message to the second management node. The method of claim 3, Second time to the first management node receives the first time interval and the data of the second management node is the collection from the N ₁ of the head node that receives the collected data from said N ₁ of the head node Sensor network system, characterized in that the gap does not overlap each other. The method of claim 3, When the mobile sink node enters an inner region of the second sub sensor field out of the boundary area between the first sub sensor field and the second sub sensor field, And wherein the first management node releases the first tree topology to stop transmission of the collected data to the mobile sink node. The method of claim 8, When the mobile sink node enters the inner region of the second sub sensor field, The mobile sink node broadcasts a second information message, And wherein the second information message includes at least one of release information of the first tree topology and an ID of the mobile sink node. The method of claim 1, When the mobile sink node enters near a boundary of the first sub sensor field, the second sub sensor field, and the third sub sensor field-the first sub sensor field, the second sub sensor field, and the third sub sensor. Sensor fields are adjacent to each other-, The second management node present in the second sub sensor field forms a second tree topology with the N ₁ head nodes to receive the collected data, transmit the collected data to the mobile sink node, The third management node present in the third sub sensor field forms a third tree topology with the N ₁ head nodes to receive the collected data, and transmits the collected data to the mobile sink node. And the mobile sink node further receives the collected data transmitted from the second management node and the third management node. N ₂ moves on the sensor field is divided into sub-field sensors and, in the sensor network system including a mobile sink node receiving the data collected from the N ₁ clusters present in the sensor field, Present in the N ₂ sub sensor field, respectively, and the N ₂ of the managed node to receive the collected data from the N ₁ of the head node in each of which can be transmitted to the mobile sink node to said N _1-cluster Including, The N ₂ managed nodes in any one of the first administration of the node to the border area of the first sub-sensor inner region and the first sub-sensor field of the field in which the first management node exists, the mobile sink node position The sensor network system, wherein the collected data is received from the N ₁ head nodes and transmitted to the mobile sink node. The method of claim 11, The first sub-sensor field includes a plurality of clusters that are part of the N ₁ clusters, And the first management node corresponds to any one head node among a plurality of head nodes included in each of the plurality of clusters. The method of claim 12, The data transmission power of one head node corresponding to the first management node is greater than the data transmission power of the other head nodes except for any one of the head nodes. Sensor network system. A method for transmitting data collected in N ₁ clusters present on a sensor field to a mobile sink node moving on the sensor field, wherein the sensor field is partitioned into N ₂ sub sensor fields and the N ₂ Each of the four sub-sensor fields includes one management node, The N ₂ sub sensor fields from the mobile sink node position the first sub-sensor of the first management node and the N ₁ clusters each including N ₁ of the head node is the present in the field to the first tree topology that Forming; Receiving, by the first management node, the collected data from the N ₁ head nodes through the first tree topology to the mobile sink node; And And the mobile sink node receiving the collected data transmitted from the first management node. The method of claim 14, When the mobile sink node enters the boundary region of the first sub sensor field and the second sub sensor field adjacent to the first sub sensor field, Forming, by the second management node present in the second sub sensor field, a second tree topology with the N ₁ head nodes; Receiving, by the second management node, the collected data through the second tree topology and transmitting to the mobile sink node; And And the mobile sink node further receiving the collected data from the second management node. The method of claim 15, When the mobile sink node enters an inner region of the second sub sensor field out of the boundary area between the first sub sensor field and the second sub sensor field, The first management node releasing the first tree topology to stop transmission of the collected data to the mobile sink node Data transmission control method in a sensor network system, characterized in that it further comprises.

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