JP5053977B2 - Sensor network system, program distribution device, sensor node, and program - Google Patents

Description

  The present invention relates to a sensor node technique, and more particularly to a technique for distributing a program executed on a sensor node.

  The sensor network system performs arithmetic processing on solid objects such as furniture, tableware, utensils, tools, and devices arranged in the room, and objects that are part of buildings such as floors, walls, ceilings, and columns. This is a system in which small sensor nodes having functions, wireless communication functions, and sensing functions are attached, a network is formed by these sensor nodes, and sensor data acquired by individual sensor nodes is collected.

  Conventionally, there is a method of changing a node program using a wireless communication function as a method of changing a node program executed in such a sensor node (see, for example, Patent Document 1). In this method, a node program prepared in a program distribution device (server) is sent to a designated sensor node using a wireless communication function, and the node program on the sensor node is rewritten.

T.Liu, CMSadler, P.Zhang, and M.Martonosi, "Implementing software on resource constrained mobile sensors: experiences with impala and zebranet," In Proc. Or the 2nd Intl. Conf. On Mobile systems, applications, and services (MobiSys), pp. 256-269 (2004).

When a program on a sensor node is distributed, a wireless communication method performed between the program distribution apparatus (server) and the sensor node is wireless directly between the program distribution apparatus and the sensor node that is a target for rewriting the node program. There are a method for performing communication and a method for repeatedly transmitting wireless communication to a target sensor node via a node program through one or more other sensor nodes.
Here, when the wireless communication method is used, the power consumed by the sensor node is directly proportional to the square of the communication section distance between the two parties that perform wireless communication. For this reason, in order to suppress power consumption, it is important to shorten the wireless section distance between two persons performing wireless communication. However, since the conventional method does not consider the wireless section distance between the two parties, the power cost for wireless communication may increase.

  The present invention is for solving such a problem, and a sensor network system, a program distribution device, a sensor node, and the like that can reduce the wireless communication power consumed by the sensor node when distributing the node program to the sensor node, And aims to provide a program.

  In order to achieve such an object, a sensor network system according to the present invention includes a plurality of sensor nodes constituting a sensor network by wireless communication, and collects sensor data sensed by the sensor node via the sensor network. A network system comprising a program distribution device that distributes a node program via wireless communication to a distribution destination node of any of sensor nodes, and the program distribution device is a distance between sensor nodes And a route calculation unit for calculating the shortest route to the delivery destination node based on distance data indicating the distance between the sensor node and the device itself, and a distribution program in which the sensor nodes constituting the shortest route are described in the order of delivery. Attached to the And a program distribution unit that distributes by wireless communication based on the communication list, and the sensor node receives the distribution data by wireless communication via the sensor network, and is specified by the distribution list included in the distribution data. And a program transfer unit that transfers the distribution data via a sensor network by wireless communication, and stores the node program in the distribution data in a storage unit when the distribution data is addressed to the own node.

  At this time, the sensor node is provided with a plurality of wireless communication units arranged at different positions, and the route calculation unit determines the wireless section distance between the wireless communication units of the sensor node and the wireless communication unit of the sensor node and the wireless of the own device. Based on the distance data indicating the wireless section distance with the communication unit, the shortest route to the distribution destination node is calculated, and the program communication unit distributes the wireless communication unit for reception and transmission of the sensor nodes that form the shortest route. The distribution list described in order may be attached to the node program, and the distribution data may be distributed from the wireless communication unit of the own apparatus based on the distribution list.

  In addition, the program transfer unit cuts off its own section information regarding the reception and transmission wireless communication unit of its own node from the distribution list of distribution data received by the wireless communication unit of its own node, and then the remaining distribution list and node program The new distribution data consisting of the above may be transferred from the transmission wireless communication unit of the own node specified by the own section information to the reception wireless communication unit of the next node specified by the remaining distribution list. Good.

  In addition, when the route calculation unit calculates a plurality of shortest routes having the same sum of the wireless section distances to the distribution destination node, the wired section distance in the wired section between each sensor node and the wireless communication unit of the sensor node May be selected as the shortest route for distributing the node program, among the shortest routes, which has the smallest sum of the wired section distances included in the shortest route.

  The program distribution apparatus according to the present invention includes a plurality of sensor nodes that constitute a sensor network by wireless communication, and is used in a sensor network system that collects sensor data sensed by the sensor node via the sensor network. Is a program distribution device that distributes a node program by wireless communication via a sensor network to any one of the distribution destination nodes, and indicates a distance between the sensor nodes and a distance between the sensor node and the own device. Based on the data, a route calculation unit for calculating the shortest route to the distribution destination node and a distribution list in which the sensor nodes constituting the shortest route are described in the distribution order are attached to the node program, and the distribution data is added to the distribution list. Program distribution based on wireless communication And a part.

  At this time, the sensor node is provided with a plurality of wireless communication units arranged at different positions, and the route calculation unit determines the wireless section distance between the wireless communication units of the sensor node and the wireless communication unit of the sensor node and the wireless of the own device. Based on the distance data indicating the wireless section distance with the communication unit, the shortest route to the distribution destination node is calculated, and the program communication unit distributes the wireless communication unit for reception and transmission of the sensor nodes that form the shortest route. The distribution list described in order may be attached to the node program, and the distribution data may be distributed from the wireless communication unit of the own apparatus based on the distribution list.

  In addition, when the route calculation unit calculates a plurality of shortest routes having the same sum of the wireless section distances to the distribution destination node, the wired section distance in the wired section between each sensor node and the wireless communication unit of the sensor node May be selected as the shortest route for distributing the node program, among the shortest routes, which has the smallest sum of the wired section distances included in the shortest route.

  The sensor node according to the present invention distributes a node program by wireless communication via a sensor network to a plurality of sensor nodes constituting the sensor network by wireless communication and any one of the sensor nodes. A sensor node used in a sensor network system for collecting sensor data sensed by a sensor node via a sensor network, receiving the distribution data via the sensor network by wireless communication, and When the distribution data is transferred to the next sensor node specified in the distribution list included in the distribution data by wireless communication via the sensor network, and the distribution data is addressed to the own node, the node program in the distribution data is Program to be stored in the storage unit It has a feeding portion.

  At this time, a plurality of wireless communication units arranged at different positions are provided, and a program transfer is performed using a list in which the wireless communication units for reception and transmission of sensor nodes constituting the shortest path are described in the distribution order as a distribution list. The local section information related to the reception and transmission wireless communication section of the local node is cut out from the distribution list of the distribution data received by the wireless communication section of the local node, and a new distribution list and a node program are formed. The distribution data may be transferred from the transmission wireless communication unit of the own node specified by the own section information to the reception wireless communication unit of the next node specified by the remaining distribution list.

  The program according to the present invention includes a plurality of sensor nodes that constitute a sensor network by wireless communication, and is used in a sensor network system that collects sensor data sensed by the sensor node via the sensor network. To any of the distribution destination nodes, to the computer of the program distribution apparatus that distributes the node program by wireless communication via the sensor network, to the distance data indicating the distance between the sensor nodes and the distance between the sensor node and the own apparatus Based on the distribution list, a route calculation step for calculating the shortest route to the distribution destination node and a distribution list in which the sensor nodes constituting the shortest route are described in the distribution order are attached to the node program. Program distributed by communication To execute and the non-delivery step.

  Further, another program according to the present invention provides a node program by wireless communication via a sensor network to a plurality of sensor nodes constituting the sensor network by wireless communication and any one of the sensor nodes. Receiving the distribution data by wireless communication via the sensor network to the sensor node computer used in the sensor network system that collects the sensor data sensed by the sensor node via the sensor network. When the distribution data is transferred by wireless communication to the next sensor node specified in the distribution list included in the distribution data via the sensor network, and the distribution data is addressed to the own node, the node program in the distribution data Is stored in the memory To execute the program transfer step.

  According to the present invention, when a node program is distributed to a designated sensor node via one or more sensor nodes, each of the sensor nodes having the shortest communication section distance is selected as the distribution route. Wireless communication power consumed by the sensor node can be reduced to the minimum.

Next, embodiments of the present invention will be described with reference to the drawings.
[Configuration of one embodiment]
First, a sensor network system according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a block diagram showing a configuration of a sensor network system according to an embodiment of the present invention.

  This sensor network system distributes a node program by wireless communication to a plurality of sensor nodes 20 constituting the sensor network by wireless communication and any of the distribution destination nodes of the sensor nodes via the sensor network. The apparatus 10 is comprised.

  In the present embodiment, the program distribution device 10 calculates the shortest route to the distribution destination node based on the distance data indicating the distance between the sensor nodes 20 and the distance between the sensor node 20 and the own device 10, and the shortest route is calculated. A distribution list in which the sensor nodes 20 constituting the route are described in the distribution order is attached to the node program, and the distribution data is distributed by wireless communication based on the distribution list. In addition, the sensor node 20 receives the distribution data via the sensor network by wireless communication, and wirelessly transmits the distribution data to the next sensor node 20 specified by the distribution list included in the distribution data via the sensor network. When distribution is performed by communication and the distribution data is addressed to the own node, the node program in the distribution data is stored in the storage unit.

[Program delivery device]
Next, with reference to FIG. 1, the structure of the program delivery apparatus 10 concerning this Embodiment is demonstrated in detail.
1 includes an information processing apparatus such as a server device or a personal computer as a whole, and main function units include a wireless communication unit 11, an operation input unit 12, a screen display unit 13, a storage unit 14, and An arithmetic processing unit 15 is provided.

The wireless communication unit 11 includes a dedicated wireless communication circuit, and has a function of performing wireless communication with the sensor node 20 based on control from the arithmetic processing unit 15.
The operation input unit 12 includes an operation input device such as a keyboard and a mouse, and has a function of detecting an operator operation and outputting the operation to the arithmetic processing unit 15.
The screen display unit 13 includes a screen display device such as an LCD or a PDP, and has a function of displaying various information such as an operation menu and a distribution list output from the arithmetic processing unit 15 on the screen.

The storage unit 14 includes a storage device such as a hard disk or a memory, and has a function of storing various processing information and programs 14P used for processing in the arithmetic processing unit 15.
The program 14P is a program that is read from an external device or a recording medium via an input / output interface unit (not shown) provided in the program distribution device 10 and stored in the storage unit 14 in advance. Various processing units of the arithmetic processing unit 15 are realized by being read and executed by the arithmetic processing unit 15.

Main processing information stored in the storage unit 14 includes a node program 14A, distance data 14B, and a distribution list 14C.
The node program 14 </ b> A is a program executed by the sensor node 20. Via an input / output interface unit (not shown) provided in the program distribution device 10, it is read from an external device or a recording medium, stored in the storage unit 14 in advance, and distributed to the sensor node 20 as necessary. Note that the arithmetic processing unit 15 of the program distribution device 10 may be provided with a processing unit in which the user describes the source code of the node program 14A and compiles the source code to generate the node program 14A.

  The distance data 14 </ b> B is data indicating the distance between the sensor nodes 20 and the distance between the sensor nodes 20 and the program distribution device 10. At this time, when each sensor node 20 includes a plurality of wireless communication units arranged at different positions, as the distance data 14B, the wireless section distance between the individual wireless communication units of each sensor node 20, and each sensor Data indicating the wireless section distance between each wireless communication unit of the node 20 and the wireless communication unit of the program distribution device 10 is used.

  The distribution list 14 </ b> C is a list in which the sensor nodes 20 constituting the shortest path from the program distribution device 10 to the distribution destination node that is the distribution destination of the node program 14 </ b> A among the sensor nodes 20 are described in the distribution order. Further, when each sensor node 20 includes a plurality of wireless communication units arranged at different positions, the reception list and the transmission wireless communication units of each sensor node constituting the shortest path are arranged in the distribution order as the distribution list 14C. Use the listed list.

The arithmetic processing unit 15 includes a microprocessor such as a CPU and its peripheral circuits, and by reading and executing the program 14P from the storage unit 14, the hardware and the program 14P cooperate with each other to execute various processing units. It has a function to realize.
As main processing units realized by the arithmetic processing unit 15, there are a route calculation unit 15A and a program distribution unit 15B.

The route calculation unit 15A has a function of calculating the shortest route from the program distribution device 10 to the distribution destination node based on the distance data 14B in the storage unit 14. For a specific algorithm for calculating the shortest path, a known technique may be used. In addition, as the distance for evaluating the shortest path, the square of the linear distance between two persons performing direct wireless communication among the program distribution apparatus 10 and the sensor node 20 located on the path from the program distribution apparatus 10 to the distribution destination node. May be used. This is because the power consumed by the sensor node 20 is directly proportional to the square of the communication section distance between the two parties that perform wireless communication.
In this way, by selecting the shortest path from the program distribution apparatus 10 to the distribution destination node, it is possible to minimize the wireless power consumption in the entire sensor network system required for program distribution.

  The program distribution unit 15B generates a distribution list 14C in which each sensor node 20 constituting the shortest route calculated by the route calculation unit 15A is described in the order of distribution and stores it in the storage unit 14, and the distribution list 14C. It has a function of generating distribution data attached to the node program 14A of the storage unit 14, and a function of distributing the distribution data by the wireless communication unit 11 based on the distribution list 14C. At this time, when each sensor node 20 includes a plurality of wireless communication units arranged at different positions, the reception and transmission wireless communication units of each sensor node 20 configuring the shortest path are described in the order of distribution. A distribution list 14C is generated.

[Sensor node]
Next, the configuration of the sensor node 20 according to the present embodiment will be described in detail with reference to FIG.
The sensor node 20 in FIG. 1 is a small electronic device having an arithmetic processing function, a wireless communication function, and a sensing function. For example, a solid object such as furniture, tableware, appliances, tools, and devices arranged in a room, It is attached to an object that forms a part of a building such as a floor, wall, ceiling, or pillar, and has a function of sensing the surrounding situation and transmitting the obtained sensor data by wireless communication through a sensor network. is doing.

  The sensor node 20 includes one or more wireless communication units 21 (21A to 21N), a sensing unit 22, a storage unit 24, and an arithmetic processing unit 25 as main functional units. Note that the sensor nodes X, Y, and Z in FIG. 1 all have the same configuration.

  The wireless communication unit 21 includes a dedicated wireless communication circuit, and has a function of performing wireless communication with other sensor nodes 20 and the program distribution device 10 based on control from the arithmetic processing unit 25. At this time, the specific communication method used in the wireless communication unit 21 is similar to ZigBee (registered trademark: IEEE802.15.4), wireless LAN (IEEE802.11 series), UWB (Ultra Wide Band: IEEE 802.15.3a). There are communication using radio waves, infrared communication, communication using magnetism, and communication using visible light.

  In the example of FIG. 1, a plurality of wireless communication units 21 </ b> A to 21 </ b> N having different arrangement positions are provided in one sensor node. The wireless communication unit 21 and the arithmetic processing unit 25 are connected by a wired signal line. Regarding data transmission / reception between the two, the difference in power consumption due to the distance between the two is different from that of other sensor nodes. It is considered to be negligibly small compared to the power required for wireless communication between the two.

  Each wireless communication unit 21 of the sensor node 20 is given a unique ID in advance on the sensor network, and a transmission source and a transmission destination of distribution data are specified using this ID. At this time, an address used in the wireless communication method may be used as the ID, and a correspondence table between the ID and the address may be set in the storage unit 24.

  The sensing unit 22 is a sensor that senses various physical quantities indicating the situation around the sensor node 20. Specific configurations of the sensing unit 22 include an acceleration sensor, a gyro sensor, an image sensor, a temperature sensor, a humidity sensor, and a magnetic sensor. Illuminance sensor, heart rate sensor. This is realized by one or a combination of a blood pressure sensor and a voice sensor.

The storage unit 24 includes a storage device such as a memory, and has a function of storing various processing information and node programs 24P used for processing in the arithmetic processing unit 25.
The node program 24P is a program distributed from the program distribution device 10 via the wireless communication unit 21 and stored in the storage unit 14 in advance. Various processing units of the arithmetic processing unit 25 are realized by being read and executed by the arithmetic processing unit 25.

  The arithmetic processing unit 25 includes a microprocessor such as a CPU and its peripheral circuits, and reads out and executes the node program 24P from the storage unit 24, thereby causing the hardware and the node program 24P to cooperate with each other. Has a function to realize the part. At this time, the arithmetic processing unit 25 may execute the node program 24P using an operating system similar to the Linux OS, and does not have a special operating system and directly executes the node program 24P described in machine language. It may be.

As main processing units realized by the arithmetic processing unit 25, there are a node processing unit 25A and a program transfer unit 25B.
The node processing unit 25 </ b> A has a function of transmitting the sensor data sensed by the sensing unit 22 from the wireless communication unit 21.
The program transfer unit 25B receives the distribution data via the sensor network by the wireless communication unit 21, and distributes the distribution data to the next sensor node 20 specified by the distribution list included in the distribution data via the sensor network. It has a function of transferring data from the wireless communication unit 21 and a function of storing the node program 24P in the distribution data in the storage unit 24 when the distribution data is addressed to the own node.

[Operation of Program Distribution Device]
Next, the operation of the program distribution apparatus 10 according to the embodiment of the present invention will be described with reference to FIG. 2 and FIG. FIG. 2 is a flowchart showing a program distribution process of the program distribution apparatus according to the embodiment of the present invention. FIG. 3 is an arrangement example of the wireless communication unit.

In the arrangement example of FIG. 3, the sensor node X (20) exists between the program distribution device S (10) and the sensor node Y (20) that is the distribution destination node. A route from the program distribution device S to the sensor node Y is selected via. The sensor node X is connected with three wireless communication units XA, XB, and XC, and the sensor node Y is connected with three wireless communication units YA, YB, and YC.
Hereinafter, it is assumed that each sensor node 20 includes a plurality of wireless communication units 21 arranged at different positions, and a node program 14A stored in advance in the storage unit 14 of the program distribution device S is referred to as the program distribution device S. A case will be described as an example in which distribution is performed from sensor node X to sensor node Y.

The arithmetic processing unit 15 of the program distribution device S executes the program distribution process of FIG. 2 in response to the operator's program distribution request operation detected by the operation input unit 12.
First, the arithmetic processing unit 15 calculates the shortest route from the program distribution device S to the distribution destination node instructed by the program distribution request operation by the route calculation unit 15A based on the distance data 14B in the storage unit 14 (step S1). 100).

  In this case, the distance data 14B includes the wireless section distance between the individual wireless communication units 21 of each sensor node 20, and the relationship between the individual wireless communication unit 21 of each sensor node 20 and the wireless communication unit 11 of the program distribution device 10. It consists of data indicating the radio section distance. Therefore, the route calculation unit 15A calculates the shortest route specifying the wireless communication unit 21 used for reception and transmission in each sensor node 20.

  Among these, in the sensor node X, the wireless communication unit SA is the most out of one or more wireless communication units that can communicate with the wireless communication unit SA of the program distribution device SA among the plurality of wireless communication units XA, XB, and XC. The wireless communication unit XA with the short wireless communication distance is selected as the reception wireless communication unit for the sensor node X, and the wireless communication unit XC with the shortest wireless communication distance with the wireless communication unit YA for the sensor node Y is for receiving the sensor node X. Selected as the wireless communication unit. In the sensor node Y, the most wireless communication with the wireless communication unit XC among the one or more wireless communication units that can communicate with the wireless communication unit XC of the sensor node X among the plurality of wireless communication units YA, YB, YC. The wireless communication unit YA having a short distance is selected as the reception wireless communication unit of the sensor node Y.

Next, the program distribution unit 15B generates a distribution list 14C in which the wireless communication units 21 for reception and transmission of the sensor nodes X and Y constituting the shortest path calculated by the path calculation unit 15A are described in the order of distribution. Then, it is stored in the storage unit 14 (step 101).
In the arrangement example of the wireless communication units in FIG. 3, the distribution list 31 </ b> S is a distribution list 31 </ b> S called “SA, XA, XC, YA” in which the IDs of the wireless communication units for transmission and reception described above are described in the order of distribution. Generated.

Subsequently, the program distribution unit 15B cuts its own section information, that is, the ID related to the wireless communication unit 11 connected to the own device, from the generated distribution list 14C (step 102), and the remaining distribution list 31X and nodes Distribution data is generated from the program 14A (step 103).
Therefore, in the example of FIG. 3, the content of the distribution list 31S generated first is “SA, XA, XC, YA”, among which the ID “SA” of the wireless communication unit 11 that is its own section information 32S is cut off and the rest The contents of the distribution list 31X are “XA, XC, YA”.

  Thereafter, the program distribution unit 15B selects the wireless communication unit SA designated by the cut own section information 32S from the wireless communication unit 11 of the own device as a transmission source of the distribution data (step 104). The wireless communication unit XA (21) of the sensor node X designated at the head of the remaining distribution list 31X is selected as a transmission destination of distribution data (step 105). Then, addresses corresponding to the IDs of the transmission source and the transmission destination are attached to the distribution data, respectively, and the distribution data is transmitted from the wireless communication unit SA serving as the transmission source (step 106), and the series of program distribution processes is completed. .

[Sensor node operation]
Next, the operation of the sensor node 20 according to the embodiment of the present invention will be described with reference to FIG. FIG. 4 is a flowchart showing the program transfer process of the sensor node according to the embodiment of the present invention.
Here, as shown in FIG. 3, the case where the node program 14A distributed from the program distribution device S (10) is distributed to the sensor node Y (20) via the sensor node X (20) is taken as an example. explain.

When the distribution data transmitted from the program distribution device S is received by the program transfer unit 25B via the wireless communication unit XA (21), the arithmetic processing unit 25 of the sensor node X executes the program transfer process of FIG. .
First, the program transfer unit 25B cuts the own section information, that is, the ID related to the wireless communication unit 21 connected to the own node X, from the distribution list 31X included in the received distribution data (step 200). Therefore, in the example of FIG. 3, since the contents of the distribution list 31X are “XA, XC, YA”, “XA, XC” is cut out as the own section information 32X, and the contents of the remaining distribution list 31Y are “YA”. It becomes.

  Here, the program transfer unit 25B checks whether or not there is a delivery destination in the remaining delivery list 31Y (step 201). In this case, “YA” remains as the delivery destination (step 201: YES). Then, new distribution data is generated from the remaining distribution list 31Y and the node program 14A included in the distribution data (step 202).

  Thereafter, the program distribution unit 15B selects the wireless communication unit XC designated at the end of the cut section information 32S from the wireless communication unit 21 of the own node as a transmission source of the distribution data (Step S1). 203) The wireless communication unit YA (21) of the sensor node Y designated at the head of the remaining distribution list 31Y is selected as a transmission destination of distribution data (step 204). Then, the addresses corresponding to the IDs of the transmission source and the transmission destination are attached to the new distribution data, respectively, and the distribution data is transmitted from the wireless communication unit XC as the transmission source (step 205), and a series of program transfer processes are performed. finish.

On the other hand, when the calculation processing unit 25 of the sensor node Y receives the distribution data transmitted from the sensor node X by the program transfer unit 25B via the wireless communication unit YA (21), the arithmetic processing unit 25 of FIG. Execute program transfer processing.
First, the program transfer unit 25B cuts its own section information, that is, the ID related to the wireless communication unit 21 connected to the own node Y, from the distribution list 31Y included in the received distribution data (step 200). Therefore, in the example of FIG. 3, since the content of the distribution list 31Y is “YA”, “YA” is cut off as the own section information 32Y, and the content of the remaining distribution list becomes blank.

  Here, the program transfer unit 25B checks whether or not there is a delivery destination in the remaining delivery list (step 201), and in this case, nothing remains as a delivery destination (step 201: NO), so the delivery data The node program 14A is extracted from the data, stored in the storage unit 24 as the node program 24P (step 206), and the series of program transfer processes is terminated. At this time, if the node program before update is executed, the execution of the node program is stopped, the new node program 24P is overwritten, and then the new node program 24P is executed.

[Effect of one embodiment]
As described above, in the present embodiment, the program distribution apparatus 10 uses the shortest path to the distribution destination node based on the distance between the sensor nodes 20 and the distance data 14B indicating the distance between the sensor node 20 and the own apparatus 10. The distribution list 14C in which the sensor nodes 20 constituting the shortest path are described in the distribution order is attached to the node program 14A, and the distribution data is distributed by wireless communication based on the distribution list 14C.

  In the present embodiment, the sensor node 20 receives distribution data by wireless communication via the sensor network, and sends the sensor network to the next sensor node 20 specified by the distribution list 14C included in the distribution data. The distribution data is distributed via wireless communication, and when the distribution data is addressed to the own node, the node program 14A in the distribution data is stored in the storage unit 24.

  Therefore, when the node program 14A is distributed to the designated sensor node 20 via the one or more sensor nodes 20, each of the sensor nodes 20 having the shortest communication section distance is selected as the distribution route. The wireless communication power consumed by the sensor node 20 can be reduced to the minimum.

  In the present embodiment, each sensor node 20 is provided with a plurality of wireless communication units 21 arranged at different positions. In the program distribution device 10, the route calculation unit 15A uses the wireless communication units 21 of the sensor nodes 20 to communicate with each other. The shortest path to the distribution destination node is calculated based on the distance between the wireless section and the distance data 14B indicating the wireless section distance between the wireless communication unit 21 of the sensor node 20 and the wireless communication unit 11 of the own device 10, and program distribution The unit 15B attaches the distribution list 14C in which the wireless communication unit 21 for reception and transmission of the sensor node 20 constituting the shortest path is described in the distribution order to the node program 14A, and the distribution data is based on the distribution list 14C. You may make it deliver from the radio | wireless communication part 11 of the own apparatus 10. FIG.

  Thus, when the node program 14A is distributed using a plurality of wireless communication units 21 arranged at different positions of each sensor node 20, wireless communication of the sensor node 20 having the shortest communication section distance as the distribution route. Since the units 21 are selected, the wireless communication power consumed by each sensor node 20 can be more accurately reduced.

In the present embodiment, in each sensor node 20, the program transfer unit 25 </ b> B performs wireless communication for reception and transmission of the own node 20 from the distribution list 31 of distribution data received by the wireless communication unit 21 of the own node 20. After cutting out the own section information 32 on the section 21, new distribution data including the remaining distribution list 31 and the node program 14A is sent from the transmission wireless communication section 21 of the own node designated by the own section information 32. You may make it transfer to the radio | wireless communication part 21 for reception of the next node designated with the remaining delivery lists 31. FIG.
As a result, the node program can be appropriately transferred to the delivery destination node based on the optimum route selected by the program delivery device 10 without requiring complicated processing.

  In addition, when only one wireless communication unit 21 is connected to each sensor node 20 or when the installation positions of the wireless communication units 21 are almost the same, a unique ID given in advance to the sensor node 20 is used. The distance data 14B and the distribution list 14C may be described using the ID of the sensor node 20.

In the present embodiment, the distance data 14B in the storage unit 14 is set in advance with a wired section distance in a wired section connecting each sensor node and its wireless communication unit, and from the program distribution apparatus 10 to the distribution destination node. When calculating the shortest route, the shortest route may be calculated in consideration of this wired section distance.
Specifically, in the route calculation unit 15A of the program distribution device 10, when a plurality of shortest routes having the same sum of wireless section distances to the distribution destination node are calculated, the wireless communication between each sensor node 20 and the sensor node is performed. Based on distance data indicating a wired section distance in a wired section connecting with the communication unit 21, to distribute a node program for each shortest path having the smallest total of the wired section distances included in the shortest path May be selected as the shortest path.
As a result, it is possible to select the route with the shortest distance in both the wireless section and the wired section, and to select the most reliable route as a route for distributing the node program to the distribution destination node. Become.

It is a block diagram which shows the structure of the sensor network system concerning one embodiment of this invention. It is a flowchart which shows the program delivery process of the program delivery apparatus concerning one embodiment of this invention. It is an example of arrangement | positioning of a radio | wireless communication part. It is a flowchart which shows the program transfer process of the sensor node concerning one embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Sensor network system, 10, S ... Program delivery apparatus, 11, SA ... Wireless communication part, 12 ... Operation input part, 13 ... Screen display part, 14 ... Memory | storage part, 14A ... Node program, 14B ... Distance data, 14C ... distribution list, 14P ... program, 15 ... arithmetic processing unit, 15A ... route calculation unit, 15B ... program distribution unit, 20, X, Y, Z ... sensor node, 21, 21A-21N, XA, XB, XC, YA , YB, YC ... wireless communication unit, 22 ... sensing unit, 24 ... storage unit, 24P ... node program, 25 ... arithmetic processing unit, 25A ... node processing unit, 25B ... program transfer unit, 31, 31S, 31X, 31Y ... Distribution list, 32, 32S, 32X, 32Y, own section information.

Claims (8)

A sensor network system comprising a plurality of sensor nodes constituting a sensor network by wireless communication, and collecting sensor data sensed by the sensor node via the sensor network,
A program distribution device that distributes a node program by wireless communication via the sensor network to any distribution destination node of the sensor nodes,
The program distribution device includes a route calculation unit that calculates a shortest route to the distribution destination node based on distance data indicating a distance between the sensor nodes and a distance between the sensor node and the own device; and the shortest route A distribution list in which the sensor nodes constituting the distribution list are attached to the node program, and the distribution data is distributed by wireless communication based on the distribution list.
The sensor node receives the distribution data via the sensor network by wireless communication, and wirelessly transmits the distribution data to the next sensor node specified by the distribution list included in the distribution data via the sensor network. Transferred by communication, and when the distribution data is addressed to its own node, a program transfer unit that stores the node program in the distribution data in the storage unit ,
The sensor node includes a plurality of wireless communication units arranged at different positions,
The route calculation unit is configured to transmit the distribution destination based on distance data indicating a wireless interval distance between wireless communication units of the sensor node and a wireless interval distance between the wireless communication unit of the sensor node and the wireless communication unit of the own device. Calculate the shortest path to the node,
The program distribution unit attaches a distribution list in which the wireless communication units for reception and transmission of the sensor node constituting the shortest path are described in the distribution order to the node program, and distributes the distribution data based on the distribution list. A sensor network system, which is distributed from a wireless communication unit of its own device . The sensor network system according to claim 1 ,
The program transfer unit cuts off its own section information related to the reception and transmission wireless communication unit of the local node from the distribution list of distribution data received by the wireless communication unit of the local node, and then the remaining distribution list and the node program The new distribution data consisting of the following is transferred from the transmission wireless communication unit of the own node specified by the own section information to the reception wireless communication unit of the next node specified by the remaining distribution list, Sensor network system. The sensor network system according to claim 1 ,
When the plurality of shortest paths having the same total sum of wireless section distances to the delivery destination node are calculated, the route calculation unit is configured to connect a wired section in a wired section between each sensor node and the wireless communication unit of the sensor node. Based on the distance data indicating the distance, the shortest route among the shortest routes is selected as the shortest route for distributing the node program, with the smallest sum of the wired section distances included in the shortest route. Sensor network system. A plurality of sensor nodes constituting a sensor network by wireless communication, and used in a sensor network system that collects sensor data sensed by the sensor node via the sensor network, and is distributed to any of the sensor nodes A program distribution device that distributes a node program to a node by wireless communication via the sensor network,
A route calculation unit that calculates the shortest route to the delivery destination node based on the distance between the sensor nodes and the distance data indicating the distance between the sensor node and the own device;
A program distribution unit that attaches a distribution list in which the sensor nodes constituting the shortest path are described in the distribution order to the node program, and distributes the distribution data by wireless communication based on the distribution list ;
The sensor node includes a plurality of wireless communication units arranged at different positions,
The route calculation unit is configured to transmit the distribution destination based on distance data indicating a wireless interval distance between wireless communication units of the sensor node and a wireless interval distance between the wireless communication unit of the sensor node and the wireless communication unit of the own device. Calculate the shortest path to the node,
The program distribution unit attaches a distribution list in which the wireless communication units for reception and transmission of the sensor node constituting the shortest path are described in the distribution order to the node program, and distributes the distribution data based on the distribution list. Deliver from the wireless communication unit of its own device
A program distribution apparatus characterized by the above. The program distribution apparatus according to claim 4 , wherein
When the plurality of shortest paths having the same total sum of wireless section distances to the delivery destination node are calculated, the route calculation unit is configured to connect a wired section in a wired section between each sensor node and the wireless communication unit of the sensor node. Based on the distance data indicating the distance, the shortest route among the shortest routes is selected as the shortest route for distributing the node program, with the smallest sum of the wired section distances included in the shortest route. A program distribution device. A plurality of sensor nodes constituting a sensor network by wireless communication, and a program distribution device that distributes a node program by wireless communication to any one of the distribution nodes of the sensor nodes via the sensor network; A sensor node used in a sensor network system that collects sensor data sensed by the sensor node via the sensor network,
Receiving the distribution data via the sensor network by wireless communication, transferring the distribution data via the sensor network to the next sensor node specified by the distribution list included in the distribution data, A program transfer unit that stores the node program in the distribution data in the storage unit when the distribution data is addressed to the own node ;
A plurality of wireless communication units arranged at different positions;
With
The distribution list is composed of a list in which the wireless communication units for reception and transmission of the sensor node constituting the shortest path are described in the order of distribution,
The program transfer unit cuts off its own section information related to the reception and transmission wireless communication unit of the local node from the distribution list of distribution data received by the wireless communication unit of the local node, and then the remaining distribution list and the node program The new distribution data consisting of the following is transferred from the transmission wireless communication unit of the own node specified by the own section information to the reception wireless communication unit of the next node specified by the remaining distribution list, Sensor node to perform. The program for functioning a computer as each part which comprises the program delivery apparatus of Claim 4 or Claim 5. The program for functioning a computer as each part which comprises the sensor node of Claim 6.

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