JP2011155409A - Sensor network system, radio transmitter-receiver therefor, and sensor information transmission method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the costs of a radio transmitter-receiver by using a general purpose radio standard, and to shorten the time needed for the transmission of sensor information and to reduce the power consumption of the radio transmitter-receiver. <P>SOLUTION: A wireless LAN (Local Area Network) communication module 2 to be operated as a wireless LAN base station is arranged on the side of a sensor module 1, and sensor information T including measurement data obtained by the sensor module 1 is transmitted instead of an SSID (Service Set IDentifier) to be transmitted by beacon by a wireless LAN base station. Then, a wireless LAN communication module 5 to be operated as the radio LAN terminal station is arranged on the side of a sensor management module 6, the sensor information T is extracted from the beacon transmitted from the wireless LAN communication module 2, and it is preserved in the sensor management module 6. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a sensor network system that transmits sensor detection data to a management device using a wireless network in a home security system, for example, and a wireless transmission / reception device and a sensor information transmission method used in this system.

  In recent years, a method has been proposed in which the daily state of a user is monitored based on sensor data obtained by a sensor worn by the user, and the user's health management or crisis management is performed based on the monitoring result. ing. For example, while the user lives daily, the detection data of the sensor worn by the user is transmitted to the management device via the communication network, and the management device is based on the value of the transmitted detection data. Judge normal / non-normal. When the normal / non-normal determination result is normal, data representing the health state is transmitted to the user terminal station and the contract doctor or hospital terminal station at a constant cycle (for example, every month). On the other hand, when the determination result is abnormal, the data is immediately transmitted to the terminal station of the user and the contract doctor or the terminal station of the hospital, and displayed on the health monitoring apparatus and the user's portable terminal station. When this system is used, even if the user does not visit a hospital or the like, a doctor or the like can detect the user's daily normal / non-normal (see, for example, Patent Document 1).

JP 2003-150718 A

  However, this type of conventional system generally uses a system-specific wireless communication standard for a wireless network for transmitting sensor detection data. For this reason, it is necessary to incorporate a part corresponding to a unique wireless communication standard into the wireless module, and there is a problem that the cost is higher than when a general-purpose wireless module is used.

  The present invention has been made paying attention to the above circumstances, and the object of the invention is to reduce the cost of the wireless transmission / reception apparatus by using a general-purpose wireless standard, and to reduce the time required for transmitting sensor information. An object of the present invention is to provide a sensor network system, a wireless transmission / reception device, and a sensor information transmission method for reducing power consumption of the wireless transmission / reception device.

In order to achieve the above object, one aspect of the present invention is to provide a sensor device that measures the state of a monitoring target and outputs sensor information, and the sensor information output from the sensor device to a wireless LAN (Local Area Network). A wireless transmission device for transmitting, a wireless reception device for receiving sensor information transmitted from the wireless transmission device via the wireless LAN, and a sensor management device for managing sensor information received by the wireless reception device Sensor network system that
The sensor information output from the sensor device by the wireless transmission device is substituted into a service set identifier used by the terminal station to identify the base station in the wireless LAN, and the service set identifier into which the sensor information is substituted Is generated and transmitted to the wireless LAN. On the other hand, the wireless reception device is configured to receive a beacon transmitted from the wireless transmission device, extract sensor information from a service set identifier included in the received beacon, and output the sensor information to the sensor management device. It is what.

  That is, a wireless transmission device operating as a wireless LAN base station is arranged on the sensor device side, and sensor information is transmitted instead of the service set identifier included in the beacon transmitted by the wireless LAN base station, and the sensor management device side A wireless reception device that operates as a wireless LAN terminal station is arranged to extract sensor information from a beacon transmitted from the wireless transmission device.

Therefore, the sensor information is transmitted from the sensor device to the sensor management device via the wireless LAN, which makes it possible to use a general-purpose wireless transmission / reception device compliant with the wireless LAN communication standard. The price can be reduced.
Moreover, the sensor information is transmitted using a service set identifier of a beacon transmitted from the wireless LAN base station to the wireless LAN terminal station. For this reason, it is not necessary to establish a wireless link between the wireless transmission device and the wireless reception device each time the sensor information is transmitted, and thus the sensor information can be transmitted quickly. Further, since the procedure for establishing a wireless link is not required, it is not necessary to perform authentication or connection processing, thereby reducing the power consumption of the wireless transmission device and the wireless reception device.

One aspect of the present invention is also characterized by comprising the following aspects.
In the first aspect, in the sensor device, sensor information including measurement data and sensor identification information is generated and transmitted from the wireless transmission device. On the other hand, in the sensor management device, sensor information received by the wireless reception device is separated into measurement data and sensor identification information, and the measurement data is distinguished and stored for each sensor device based on the separated sensor identification information. It is what I did.
In this way, even when measurement data transmitted by a plurality of sensor devices is managed by one sensor management device, each measurement data can be managed separately for each sensor device.

In a second aspect, in the wireless transmission device, when the sensor information output from the sensor device is transmitted instead of the service set identifier, the sensor information is transmitted with a data length equal to or shorter than the octet length defined in advance of the service set identifier. In the wireless reception device, the received sensor information is decoded and the sensor information before quantization is reproduced.
In this way, even when the data length of the sensor information is longer than the maximum data length of the service set identifier, it is possible to reliably transmit.

In the third aspect, when transmitting the sensor information output from the sensor device instead of the service set identifier in the wireless transmission device, the sensor information is encrypted in accordance with a predetermined encryption rule. The received sensor information is decrypted to reproduce the sensor information before encryption.
In this way, even if another wireless LAN terminal station exists in the wireless LAN service area and sensor information is received at this wireless LAN terminal station, the confidentiality of the sensor information can be maintained.

  That is, according to one aspect of the present invention, the cost of the wireless transmission / reception apparatus is reduced by using a general-purpose wireless standard, and the time required for transmitting sensor information is shortened and the power consumption of the wireless transmission / reception apparatus is reduced. It is possible to provide a sensor network system, a wireless transmission / reception apparatus thereof, and a sensor information transmission method.

It is a block diagram which shows the structure of the sensor network system concerning 1st Embodiment of this invention. FIG. 2 is a block diagram illustrating a configuration of a wireless LAN communication module used as a transmission-side wireless transmission device in the system illustrated in FIG. 1. It is a block diagram which shows the structure of the wireless LAN communication module used as a radio | wireless receiving apparatus of the receiving side in the system shown in FIG. It is a flowchart which shows the process sequence and process content of each apparatus of the transmission side of the system shown in FIG. 1, and a reception side. It is a figure used for operation | movement description of the sensor module of the system shown in FIG. It is a figure explaining the quantization operation | movement by the conversion part of the sensor module shown in FIG. It is a block diagram which shows the structure of the sensor network system concerning 2nd Embodiment of this invention. It is a figure for demonstrating operation | movement when using a hash function for transmission of sensor information.

Embodiments according to the present invention will be described below with reference to the drawings.
FIG. 1 is a block diagram showing the overall configuration of a sensor network system according to the present invention. In this system, a sensor module 1 and a wireless LAN communication module 2 as a wireless transmission device are installed on the monitoring target side, and a wireless LAN communication module 5 and a sensor management device 6 as a wireless reception device are installed on the management side. The sensor information generated by the module 1 is transmitted from the wireless LAN communication module 2 to the wireless LAN communication module 5 via the wireless LAN and input to the sensor management device 6.

  The sensor module 1 includes a sensor 11 and a conversion unit 12. The sensor 11 is a sensor for monitoring the state of a home or office, and includes, for example, a human sensor, a sound sensor, an optical sensor, a vibration sensor, a smoke sensor, a wattmeter, a vital sensor that measures human vital information, and the like. .

  The conversion unit 12 quantizes the analog measurement signal Ln output from the sensor 11 and converts the analog measurement signal Ln into data that can be transmitted instead of the SSID, which will be described later. The converted quantized data P (Ln) after the conversion The information is output to the wireless LAN communication module 2 together with the identification information S of the sensor 11. As the quantization method, for example, a method of comparing the signal value of the analog measurement signal with a plurality of preset threshold values (three in this embodiment) and outputting the comparison result as quantized data is used.

  The sensor management device 6 is composed of, for example, a personal computer installed in a home or office, and includes an inverse conversion unit 61 and a management processing unit 62. The inverse transform unit 61 represents the quantized data P (Ln) included in the sensor information received by the wireless LAN communication module 5 described later according to the quantization rule of the transform unit 12 before the quantization. Convert to measurement data. Then, the inversely converted measurement data Ln is output to the management processing unit 62. The management processing unit 62 distinguishes and stores the measurement data Ln input from the inverse conversion unit 61 for each sensor based on the sensor identification information S transferred from the wireless LAN communication module 5.

By the way, the wireless LAN communication module 2 provided on the sensor module 1 side operates as a wireless LAN base station (access point), and is configured as follows. FIG. 2 is a block diagram showing the configuration.
That is, the wireless LAN communication module 2 includes an input interface unit 21, a control unit 22, a wireless transmission / reception unit 23, and a transmission antenna 3. Each time the sensor identification information S and the quantized data P (n) are transmitted from the sensor module 1 via the cable or the weak power wireless interface, the input interface unit 21 captures them and temporarily stores them in the buffer.

  The control unit 22 includes a sensor terminal information generation unit 221, an SSID replacement processing unit 222, and a beacon generation unit 223 as control functions for carrying out the present invention. All of these functions are realized by causing a central processing unit (CPU) to execute a program.

  The sensor terminal information generation unit 221 takes in the sensor identification information S and the quantized data P (n) from the input interface unit 21, and multiplexes the sensor identification information S and the quantized data P (n) in a predetermined format. Processing for generating sensor information (sensor terminal information) T (S, P (Ln)) is performed.

  The SSID replacement processing unit 222 generates a service set identifier (SSID) transmitted by a beacon at each beacon transmission timing, and sensor information T (S, S, S) generated by the sensor terminal information generation unit 221. P (Ln)) is replaced. SSID is broadcast information that a base station periodically transmits in a beacon in order to identify a base station in a wireless LAN, and a user sets an arbitrary character string within a specified octet length range. It can be done.

  The beacon generation unit 223 takes in the SSID replaced with the sensor information T (S, P (Ln)) from the SSID replacement processing unit 222 and generates a beacon including this SSID. And the process which supplies this produced | generated beacon to the wireless transmission / reception unit 23 synchronizing with a transmission timing is performed.

  The wireless transmission / reception unit 23 converts the beacon supplied from the beacon generation unit 223 into a wireless signal determined by the wireless LAN standard, and transmits the signal from the antenna 3 to the wireless LAN.

On the other hand, the wireless LAN communication module 5 provided on the sensor management device 6 side operates as a wireless LAN terminal station and is configured as follows. FIG. 3 is a block diagram showing the configuration.
That is, the wireless LAN communication module 5 includes the reception antenna 4, the wireless transmission / reception unit 51, the control unit 52, and the output interface unit 53. The wireless transmission / reception unit 51 receives the beacon transmitted from the wireless LAN communication module 2 via the reception antenna 4.

  The control unit 52 includes a beacon reception control unit 521, an SSID detection unit 522, and a separation processing unit 523 as control functions necessary for implementing the present invention. All of these functions are realized by causing a central processing unit (CPU) to execute a program.

The beacon reception control unit 521 periodically receives the beacon transmitted from the wireless LAN communication module 2 by controlling the wireless transmission / reception unit 51 according to the beacon transmission cycle of the wireless LAN communication module 2. Note that when the wireless LAN communication module 2 provided on the sensor module 1 side is configured to transmit a beacon only when the sensor module 1 operates, the beacon reception control unit 521 does not necessarily periodically transmit the beacon. There is no need to receive.
The SSID detection unit 522 extracts the SSID, that is, the sensor information T (S, P (Ln)) from the beacon of the wireless LAN communication module 2 received by the wireless transmission / reception unit 51 under the control of the beacon reception control unit 521. Process.
The separation processing unit 523 performs processing for separating the sensor information T (S, P (Ln)) extracted by the SSID detection unit 522 into sensor identification information S and quantized data P (n).

  The output interface unit 53 is defined by a cable that connects the sensor identification information S and the quantized data P (n) separated by the separation processing unit 523 between the wireless LAN communication module 5 and the sensor management device 6. Transfer processing to the sensor management device 6 is performed according to the protocol.

Next, the operation of the sensor network system configured as described above will be described.
FIG. 4 is a flowchart showing the processing procedure and processing contents. Steps S10 and S20 in the figure show the processing procedure of the conversion unit 12 in the sensor module 1 and the control unit 22 in the wireless LAN communication module 2, respectively. Steps S30 and S40 show processing procedures of the control unit 52 in the wireless LAN communication module 5 and the inverse conversion unit 61 in the sensor management device 6, respectively.

  In the sensor module 1, as shown in FIG. 5, the sensor 11 continuously outputs an analog measurement signal. In step S11 of FIG. 4, the conversion unit 12 compares the value (sensor detection value) Ln of the analog measurement signal output from the sensor 11 with a threshold value at a constant period, and the comparison result is quantized in step S12. Is output as digitized data P (Ln).

  For example, as shown in FIG. 6, L1, L2, and L3 are set as threshold values. If the value L of the analog measurement signal is L1 ≦ L <L2, the conversion unit 12 outputs the quantized data P (L1). If the value L of the analog measurement signal is L2 ≦ L <L3, the conversion unit 12 outputs the quantized data P (L2). Similarly, if the value L of the analog measurement signal is L3 ≦ L, conversion is performed. The unit 12 outputs the quantized data P (L3). Note that when the value L of the analog measurement signal is L1> L, quantized data is not output.

  Under the control of the control unit 22, the wireless LAN communication module 2 firstly outputs the quantized data P (Ln) each time the quantized data P (Ln) is output from the conversion unit 12 of the sensor module 1 in step S21. Ln) and sensor identification information S output from the sensor 11 are captured. In step S22, the acquired quantized data P (Ln) and sensor identification information S are combined to generate sensor information (sensor terminal information) T (S, P (Ln)). At this time, the sensor information T (S, P (Ln)) may include a time stamp indicating the time when the quantized data P (Ln) is taken, that is, the measurement time.

  Next, the control unit 22 monitors whether or not the beacon transmission timing comes in step S23. In this state, when the beacon transmission timing comes, the control unit 22 proceeds to step S24 and replaces the SSID included in the beacon with the generated sensor information T (S, P (Ln)). In step S25, a beacon in which the sensor information T (S, P (Ln)) is inserted instead of the SSID is generated, and the generated beacon is transmitted from the wireless transmission / reception unit 23 to the wireless LAN in step S26. .

  On the other hand, if new quantized data P (Ln) is output from the sensor module 1 during monitoring of the beacon transmission timing in step S23, the quantized data P (Ln) and sensor identification are detected in step S21. In step S22, new sensor information T (S, P (Ln)) is generated, and the old sensor information is updated to the new sensor information.

  The sensor information T (S, P (Ln)) may be accumulated without being updated, and the sensor information may be transmitted sequentially or collectively when a beacon described later is transmitted. The sensor identification information S may be stored in advance in a memory in the control unit 22 of the wireless LAN communication module 2 and read from the memory when the sensor information T is generated.

On the other hand, the wireless LAN communication module 5 and the sensor management device 6 perform the following processing.
That is, in the wireless LAN communication module 5, under the control of the control unit 52, beacon reception monitoring is performed in step S31. In this state, when the beacon transmitted from the wireless LAN communication module 2 is received by the wireless transmission / reception unit 51, first, in step S32, the control unit 52 detects the sensor information T (inserted as the SSID from the received beacon. S, P (Ln)) is extracted, and the extracted sensor information T (S, P (Ln)) is separated into quantized data P (Ln) and sensor identification information S (step S33). The separated sensor identification information S is output to the management processing unit 62 of the sensor management device 6 and the quantized data P (Ln) is output to the inverse conversion unit 61 of the sensor management device 6 (step S34).

  The inverse conversion unit 61 of the sensor management device 6 converts the quantized data P (Ln) supplied from the wireless LAN communication module 5 into measurement data indicating the analog value Ln in step S41. This inverse conversion process is performed based on the conversion rule used by the conversion unit 12 of the sensor module 1, that is, the relationship between the quantized data P (Ln) and the threshold values L1, L2, and L3. Then, the inverse conversion unit 61 outputs the converted measurement data Ln to the management processing unit 62 in step S42.

  The management processing unit 62 stores the measurement data Ln output from the inverse conversion unit 61 for each sensor module 1 in the memory based on the sensor identification information S transferred from the wireless LAN communication module 5. In addition, when the time stamp which shows measurement time or transmission time is provided to measurement data Ln, according to this time stamp, the measurement data Ln are sorted and stored in order of oldest measurement time or transmission time.

  As described above in detail, in this embodiment, the wireless LAN communication module 2 that operates as a wireless LAN base station is disposed on the sensor module 1 side, and sensor information T including measurement data obtained by the sensor module 1 is stored in the wireless LAN. The base station transmits it instead of the SSID transmitted by the beacon. A wireless LAN communication module 5 that operates as a wireless LAN terminal station is disposed on the sensor management module 6 side, and sensor information T is extracted from the beacon transmitted from the wireless LAN communication module 2 and is used as the sensor management module. 6 to save.

  Therefore, the sensor information T is transmitted from the sensor module 1 to the sensor management module 6 via the wireless LAN, and thus, the general-purpose wireless LAN communication modules 2 and 6 compliant with the wireless LAN communication standard are used. Therefore, the system price can be reduced.

  In addition, the sensor information T is transmitted by being replaced with the SSID of the beacon transmitted from the wireless LAN base station to the wireless LAN terminal station. For this reason, when transmitting the sensor information T, it is not necessary to establish a wireless link with the wireless LAN communication modules 2 and 6 each time, so that the sensor information T can be transmitted quickly. Further, since the procedure for establishing a wireless link is not necessary, it is not necessary to perform authentication or connection processing, thereby reducing power consumption by the wireless LAN communication modules 2 and 6.

  In the sensor module 1, the analog measurement value Ln output from the sensor 11 is quantized by the conversion unit 12 so that the data length of the sensor data T is equal to or shorter than the octet length of the SSID. For this reason, it is possible to reliably transmit the sensor information T using the SSID whose data length is limited to a relatively short length.

  Further, sensor identification information S is inserted into the sensor information T in addition to the quantized data P (Ln). Therefore, even if the sensor management module 6 receives similar sensor information from other similar systems in the vicinity, the sensor management module 6 discards the information from the other similar systems and receives it from the sensor module 1 of its own system. It is possible to store only the sensor information.

In addition, this invention is not limited to the said embodiment, The other different embodiment as follows can be considered.
For example, in the above-described embodiment, the case where the sensor information of one sensor module 1 is transmitted to the sensor management device 6 via the wireless LAN has been described as an example. However, the sensor information of a plurality of sensor modules is transmitted via the wireless LAN. The present invention can also be applied to transmission to the management apparatus 6.

  FIG. 7 shows the system configuration. The plurality of sensor modules 101 to 10m are provided with wireless LAN communication modules 201 to 20m that operate as wireless LAN base stations, respectively. Each of the sensor modules 101 to 10m includes sensors 1011 to 10m1 and conversion units 1012 to 10m2. Then, the analog measurement signal value Ln output from the sensors 1011 to 10m1 is converted into data that can be replaced with the SSID by quantizing in the conversion units 1012 to 10m2.

  Each of the wireless LAN communication modules 201 to 20m multiplexes the sensor identification information S1 to Sm and the quantized data P1 (Ln) to Pm (Ln) output from the corresponding sensor modules 101 to 10m to obtain the sensor information T1 (S1 , P1 (Ln)) to Tm (Sm, Pm (Ln)). Then, the generated sensor information T1 (S1, P1 (Ln)) to Tm (Sm, Pm (Ln)) is replaced with SSID and inserted into a beacon, and this beacon is directed from the transmission antennas 301 to 30m to the wireless LAN. Send.

  On the other hand, the sensor management device 60 is provided with a wireless LAN communication module 50 that operates as a wireless LAN terminal station. The wireless LAN communication module 50 receives beacons transmitted from the plurality of wireless LAN communication modules 201 to 20m through the antenna 40, respectively. Then, sensor information T1 (S1, P1 (Ln)) to Tm (Sm, Pm (Ln)) inserted in place of the SSID is extracted from each received beacon, and the extracted sensor information T1 ( S1, P1 (Ln)) to Tm (Sm, Pm (Ln)) are respectively separated into quantized data P1 (Ln) to Pm (Ln) and sensor identification information S1 to Sm and supplied to the sensor management device 60. .

  The sensor management device 60 includes an inverse conversion unit 601 and a management processing unit 602. Then, the supplied quantized data P1 (Ln) to Pm (Ln) are decoded by the inverse transform unit 601 to be converted into data Ln representing an analog measurement value. Then, in the management processing unit 602, the data Ln representing the converted analog measurement value is distinguished and stored in the memory for each of the sensor modules 101 to 10m based on the sensor identification information S1 to Sm.

  In the embodiment, the measurement signal output from the sensor 11 is quantized by the conversion unit 12 in the sensor module 1. However, the present invention is not limited to this, and the measurement signal output from the sensor module 1 is directly or digitized and input to the wireless LAN communication module 2, and the wireless LAN communication module 2 performs a quantization process to replace it with the SSID. You may do it.

  As the quantization processing method at that time, measurement is performed using a general analog / digital converter in addition to the method of determining the value of the measurement signal based on a plurality of threshold values as shown in the embodiment. The signal may first be digitized, and then the digitized measurement data may be compressed so that it is less than or equal to the SSID octet length. Further, the measurement data is divided into a plurality of data by a predetermined length without performing data compression processing, sensor identification information is attached to each of the divided data, and the data is distributed and transmitted by SSIDs of a plurality of beacons. Then, in the wireless LAN communication module 5 on the reception side, one piece of measurement data may be reproduced by extracting the data divided from the plurality of received beacons and combining them. This can be easily realized by giving information indicating a division position such as a division order or a time stamp to each divided data.

Further, the sensor information T may be encrypted by the wireless LAN communication module 5 and transmitted. As an encryption method of the sensor information T, a method using a hash function can be considered. FIG. 8 shows an example of sensor information when a hash function is applied. If it does in this way, it can prevent that the identification information and measurement data of a sensor are easily recognized or guessed by the third party, and can improve the secrecy of a user's personal information.
In addition to the method using the hash function, other methods such as an encryption method using a WEP key used for authentication in a wireless LAN, an encryption method using a common key method, or a public key method are used as the encryption method. Can be applied arbitrarily.

  Further, in the embodiment shown in FIG. 7, the measurement data of the sensor modules 101 to 10m are individually transmitted using the wireless LAN communication modules 201 to 20m. However, the measurement data of the plurality of sensor modules 101 to 10m are respectively input to one wireless LAN communication module, and the measurement data of the plurality of sensor modules 101 to 10m is multiplexed and transmitted by the one wireless LAN communication module. You may make it do. In this case, if it is difficult to insert a plurality of pieces of sensor information into one SSID, the information may be distributed and transmitted using the SSIDs of a plurality of beacons.

  In addition to the cable connection between the sensor module 1 and the wireless LAN communication module 2 and the wireless LAN communication between the module 5 and the sensor management device 6, a weak radio wave such as Blue Tooth (registered trademark) is used. You may make it connect via a wireless network. In addition, the sensor type and its use, the configuration of the wireless LAN communication module, the configuration and processing contents of the sensor management apparatus can be variously modified and implemented without departing from the gist of the present invention.

  In short, the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.

  DESCRIPTION OF SYMBOLS 1,101-10m ... Sensor module, 2, 201-20m ... Transmission side wireless LAN communication module, 3,301-30m ... Transmission antenna, 4,40 ... Reception antenna, 5,50 ... Reception side wireless LAN communication module 6, 60 ... sensor management device, 11, 1011-10m1 ... sensor, 12, 1012-10m2 ... conversion unit, 21 ... input interface unit, 22, 52 ... control unit, 23, 51 ... wireless transmission / reception unit, 53 ... output Interface unit 61, 601 ... Inverse conversion unit, 62, 602 ... Management processing unit, 221 ... Sensor terminal station information generation unit, 222 ... SSID replacement processing unit, 223 ... Beacon generation unit, 521 ... Beacon reception control unit, 522 ... SSID detection unit, 523... Separation processing unit.

Claims (9)

A sensor device that measures the state of a monitoring target and outputs sensor information, a wireless transmission device that transmits sensor information output from the sensor device to a wireless LAN (Local Area Network), and a wireless transmission device that is transmitted from the wireless transmission device A wireless reception device that receives sensor information via the wireless LAN, and a sensor management device that manages sensor information received by the wireless reception device;
The wireless transmission device
Means for substituting sensor information output from the sensor device into a service set identifier used by a terminal station to identify a base station in the wireless LAN;
Means for generating a beacon including a service set identifier into which the sensor information is substituted and transmitting the beacon to the wireless LAN;
The wireless receiver is
Means for receiving a beacon transmitted from the wireless transmission device;
And a means for extracting sensor information from the service set identifier contained in the received beacon and outputting the sensor information to the sensor management apparatus. The sensor device includes means for generating sensor information including measurement data and sensor identification information for identifying the sensor device,
The sensor management device is configured to separate sensor information output from the wireless reception device into measurement data and sensor identification information, and to store the measurement data separately for each sensor device based on the separated sensor identification information. The sensor network system according to claim 1, further comprising: A wireless transmission device that operates as a wireless LAN base station that transmits sensor information output from a sensor device that measures a state of a monitoring target to a sensor management device via a wireless LAN (Local Area Network),
Means for substituting sensor information output from the sensor device into a service set identifier used by a terminal station to identify a base station in the wireless LAN;
And a means for generating a beacon including a service set identifier into which the sensor information is substituted and transmitting the beacon to the wireless LAN.   The wireless transmission device according to claim 3, further comprising means for quantizing the sensor information output from the sensor device into a data length equal to or less than a predetermined octet length of the service set identifier. .   5. The wireless transmission device according to claim 3, further comprising means for encrypting sensor information output from the sensor device in accordance with a predetermined encryption rule. Means for receiving a beacon transmitted from the wireless transmission device according to claim 3 via the wireless LAN;
And a means for extracting sensor information from the service set identifier contained in the received beacon and outputting the sensor information to the sensor management apparatus.   When the sensor information extracted from the service set identifier is quantized, the apparatus further comprises means for decoding the quantized sensor information and reproducing the sensor information before quantization. The wireless receiver according to claim 6.   When the sensor information extracted from the service set identifier is encrypted, it further comprises means for decrypting the encrypted sensor information and reproducing the sensor information before encryption. The radio reception apparatus according to claim 6 or 7. Sensor information output from a sensor device that measures the state of a monitoring target is transmitted to a wireless local area network (LAN) by a wireless transmission device, and sensor information transmitted from the wireless transmission device is wirelessly received via the wireless LAN. A sensor information transmission method that is received by a device and transferred to a sensor management device,
In the wireless transmission device, a process of substituting sensor information output from the sensor device into a service set identifier used by a terminal station to identify a base station in the wireless LAN;
In the wireless transmission device, a process of generating a beacon including a service set identifier into which the sensor information is substituted and transmitting the beacon to the wireless LAN;
In the wireless receiving device, receiving a beacon transmitted from the wireless transmitting device;
A method for transmitting sensor information, comprising: a step of extracting sensor information from a service set identifier included in the received beacon and outputting the sensor information to the sensor management device in the wireless reception device.

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