JP2010004903A - Sensor node and sensor network system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To transmit data accumulated in a sensor node while continuing to measure biological information and to record the data at a constant frequency. <P>SOLUTION: A sensor measures the biological information and obtains sensing data, and a wireless communication part transmits the sensing data to a server in a wireless manner. A first memory records the sensing data as a back-up. A control part carries out measurement by the sensor, wireless transmission by the wireless communication part, and transmission of the sensing data recorded as the back-up to the server. Further, an interruption control part generates a first interruption signal from a clock generating signals at prescribed intervals. The control part carries out the measurement by the sensor ahead of the transmission of the sensing data recorded as the back-up upon the reception of the first interruption signal. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a communication and sensing control technique used for a small movable sensor terminal with a wireless function.

  In recent years, sensor terminals with a wireless function (sensor nodes) that are small and have a built-in battery have been developed. Sensor nodes are installed in indoor and outdoor buildings and are used to measure environmental information such as temperature and humidity. A network system (hereinafter referred to as a sensor network system) that takes in various information in the real world into an information processing device in real time using this sensor node has been studied.

  The sensor node is activated only when sensing or wireless communication is necessary, and otherwise performs an intermittent operation to turn off the power and reduce power consumption. While operating for a long time with a small internal battery, it is as small as 3 cm in diameter and can be easily worn by a person.

  Further, the wireless standard IEEE 802.15.4 is known as an optimal wireless communication means used for the sensor node. This standard is a wireless standard with low power consumption instead of suppressing transmission speed and communication distance.

  Patent Document 1 discloses a technology in which a sensor device attached to a human arm or the like stores data stored in an analysis device such as a PC or a server by wireless or wired connection after storing sensor data in a built-in memory. Is disclosed.

  Patent Document 2 discloses a technology in which a detection device having a sensor wirelessly transmits sensor data to a receiver via a transmitter connected wirelessly or by wire.

JP-T-2004-500949 JP 2006-289081 A

  A person wears a sensor node, measures the movement of the person with an acceleration sensor, for example, and records / analyzes the measured data, thereby determining the state of movement, posture, etc. in daily life. In order to construct a sensor network system that monitors the user's health status and living activity history by applying this, typically the sensor continuously measures (sensing) several tens of times per second. is necessary. This is because when sensing is not performed, it is difficult to accurately grasp the user's health status and living behavior history because the determination is made using only the data of the time period during which sensing was performed. .

  In order to store and analyze sensing data in the server, the sensor node has a basic operation of wirelessly transmitting sensing data to the server via the base station.

  In wireless terminals such as sensor nodes, a wireless standard with low power consumption is used instead of suppressing transmission speed and communication distance, for example, IEEE 802.15.4. Since the communication distance of IEEE 802.15.4 is typically about 50 meters, when a sensor node is worn by a person, the wireless communication range of a network managed by one base station must be separated. Is easily assumed. Furthermore, communication failure between the base station and the server is assumed. In such a case, the server cannot receive the sensing data and cannot collect the sensing data. Therefore, the sensor node needs to store the sensing data as a backup in its own memory. The accumulated sensing data must be transferred to the server via the base station.

  Furthermore, since the sensor node communicates with a device such as a sensor or a memory under the control of a single microcomputer, there is a limit to simultaneously performing sensing and wireless transfer of sensing data stored in the memory.

  In this way, in order to construct a sensor network system that acquires the user's biological information in daily life and monitors the health status, etc., it is necessary to inhibit sensing performed continuously at regular intervals while considering the performance of the sensor node. However, a mechanism for transferring the accumulated sensing data to the server is essential.

  Patent Document 1 and Patent Document 2 disclose a technique for recording sensing data in a memory and then collectively transmitting the data to a server or the like, but while continuously transmitting data recorded in a memory, There is no disclosure of a control method in which sensing is performed at a constant period and sensing data is continuously recorded in a memory.

  On the other hand, when the sensor node has, for example, several tens of megabytes of non-volatile memory, the wireless communication speed applied to the sensor node is not sufficient for transmitting data recorded in the memory. For example, when the IEEE 802.15.4 is applied, it is easily assumed that it takes several tens of minutes to several hours until transmission of all data recorded in the memory is completed.

  In addition, since the sensor node reduces power consumption by the intermittent operation, there is a problem that battery life is greatly shortened when data is continuously transmitted over a long period of time. For example, assuming that the capacity of a small battery that can be built into a sensor node is about 100 mAh, if wireless transmission is performed continuously for more than one hour using IEEE802.15.4, about half of the battery capacity is consumed.

  Furthermore, when trying to output the data recorded in the memory to an external device such as a PC connected by wire, the wired connection form between the sensor node and the PC or the like to be connected becomes a problem. Specifically, the structure and shape of the sensor node is required to continue sensing the biological information of the user even during wired connection. Furthermore, even during wired connection, a structure or shape that does not hinder human daily activities such as PC work is required.

  Patent Document 1 and Patent Document 2 disclose a method in which a user periodically charges a sensor device and simultaneously collects data by wired communication, but a specific structure and shape thereof are not disclosed. . In the sensor device of Patent Document 1, when connecting to the communication and charging cradle, it is disconnected from the human body and cannot transmit data without interfering with sensing and data recording processing.

  Of the inventions disclosed in this application, the outline of typical ones will be briefly described as follows. The sensor node includes a sensor, a wireless communication unit, a first memory, a control unit, a clock, and an interrupt control unit. The sensor measures biological information and acquires sensing data, the wireless communication unit wirelessly transmits the sensing data to the server, and the first memory records the sensing data as a backup. The control unit executes measurement by the sensor, wireless transmission by the wireless communication unit, and transmission of sensing data recorded as a backup to the server. Further, the interrupt control unit generates a first interrupt signal based on a clock that generates a signal at a predetermined interval. When the control unit receives the first interrupt signal, the interrupt control unit transmits sensing data recorded as a backup. The measurement by the sensor is executed in preference to.

  According to the present invention, the sensor node continues to measure biological information and record sensing data at a constant period. Since the accumulated sensing data is transmitted, the user can collect data that is not lost.

  Embodiments according to the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a block diagram of a sensor node 1 to which the present invention is applied according to the first embodiment. In FIG. 1, in order to solve the problem, a sensing program 122 that senses a periodic signal from the real-time clock 138 as a trigger and captures data in the RAM 110 and records the data in the storage 160, and external connection detection The unit 132 controls the sensor node 1 according to a wired communication program 123 that reads data from the storage 160 and starts wired transmission to the external device using a connection with an external device such as a personal computer via USB as a trigger. And Each will be described below.

  The sensor node 1 includes a wireless communication unit (RF) 131 including an antenna 150 that communicates with a gateway (base station), an acceleration sensor 135, a temperature sensor 136, a pulse sensor 137, the microcomputer 100, and the microcomputer 100. A real-time clock (RTC) 138 that functions as a timer for triggering at regular intervals, a storage 160 that is a nonvolatile storage medium, an LCD 134 that displays characters, waveforms, graphs, and the like, and a trigger for the microcomputer 100 A plurality of switches 141 and 142 that can be applied, an external connection detection unit 132 that detects a USB connection from an external device to the terminal 170, triggers the microcomputer 100, and outputs the state to the microcomputer 100; Microcomputer 100, a USB communication unit 133 that transfers data transmitted by serial communication from 100 to an external device connected via USB, a switch 144 that blocks a signal line with the USB communication unit 133 by a signal from the microcomputer 100, and a secondary battery 147, a charging unit 139 that charges the secondary battery 147 with power supplied via a USB connection with an external device, a voltage detection unit 140 that outputs the voltage of the secondary battery 147 to the microcomputer 100, and a regulator 146 A power supply switching unit 145 for switching the power supplied to the regulator 146 between the secondary battery 147 and an external power supply via USB, a terminal 170 for connecting the USB cable, and the secondary battery 147 when the reset terminal 145 is grounded. It includes a reset switch 143 that cuts off the power supply from. In the present embodiment, an acceleration sensor, a temperature sensor, and a pulse sensor are shown as sensors for acquiring biological information, but are not limited to the above sensors.

  The microcomputer 100 converts a CPU 101 that executes arithmetic processing, a ROM 120 that records a program 121 executed by the CPU 101, a RAM 110 that temporarily records data and the like, and an analog signal input from the outside into a digital signal. The A / D converter 104, an I / O port 105 that inputs or outputs a digital signal from the outside, a real-time clock 138, a storage 160, an LCD 134, an acceleration sensor 135, a temperature sensor 136, and a pulse sensor 137 are serial signals. The serial communication unit 103 that transmits and receives signals with the wireless communication unit 7, the serial communication unit 108 that transmits and receives signals with serial signals with the wireless communication unit 7, and the serial communication unit 103 without using the CPU 101, The received data is stored in the RAM 11 And DMAC102 incorporated into, configured to include an interrupt controller 106 and 107 to interrupt the signal from the outside to the CPU101 running program 121 as a trigger.

  The programs 121 recorded in advance in the ROM 120 include a sensing program 122 and a wired communication program 123. The processing described in the sensing program 122 is executed by the CPU 101, and the data sensed by the acceleration sensor 135, the temperature sensor 136, and the pulse sensor 137 is taken into the RAM 110 via the serial communication unit 103 using the signal of the real-time clock 138 as a trigger. Then, the wireless communication unit 131 is controlled to wirelessly transmit the data fetched into the RAM 110 to a predetermined gateway, and further written into the storage 160 and recorded.

  The processing described in the wired communication program 123 is also executed by the CPU 101, starts wired communication using a signal from the external connection detection unit 132 as a trigger, is recorded in the storage 160 via the serial communication unit 103, and is wireless or Data that has not been transmitted to the outside by wire communication (untransmitted data) is read, transmitted to the USB communication unit 133, and transmitted from the USB communication unit 133 to the external device by wire. In the process of the wired communication program 123, data (transmitted data) that has been transmitted once wirelessly and wiredly can be sent again.

  Further, the wired communication program 123 can read the data in the storage 160 and record it in the RAM 110 without controlling the DMAC 102 and executing the processing by the CPU 101. Accordingly, since the CPU 101 can execute another process while the storage 160 is being read, the data can be transmitted from the RAM 100 to the USB communication unit 133. Also in the transmission to the USB communication unit 133, the DMAC 102 can be controlled to transfer data from the RAM 110 without using the CPU 101.

  The RAM 110 is a rewritable value, that is, a parameter 111, a wireless communication state 112, a wired connection state 113, a wired communication state 114, a transmission buffer 115 for temporarily recording data for wireless transmission, and a storage 160. A storage buffer 116 for temporarily recording data read from and to be written, a read address 117 indicating the position of data in the storage 160 when reading unsent data from the storage 160, and writing sensed data. It has a write address 118 indicating a write position in the storage 160.

  The parameter 111 is a value that defines the operation of the sensor node 1 and can be changed by the user. A wireless channel indicating a wireless frequency used when wireless communication is performed by controlling the wireless communication unit 131, a unique ID for identifying a sensor node, and the like are recorded.

  The wireless communication state 112 records the result of transmitting the sensed data, that is, the result of successful transmission or failure.

  The wired connection state 113 records whether or not an external device is connected via USB. The wired communication state 114 records whether or not the external device of the other party can receive data while being connected to the external device via the USB.

  The transmission buffer 115 is an area in which data sensed by the acceleration sensor 135, the temperature sensor 136, and the pulse sensor 137 are temporarily recorded and accumulated until reaching the transmission capacity. For example, when the wireless standard is IEEE 802.15.4, the data capacity (packet capacity) that can be transmitted at one time is set to about 100 bytes.

  The storage buffer 116 is an area of data to be compressed and transmitted to the storage 160 for recording after the data in the transmission buffer 115 is transmitted. It is also an area for recording the read data when the data is read from the storage 160 and transmitted wirelessly or by wire. When a typical known compression method is applied, for example, waveform data obtained by sampling an acceleration of a maximum of 3G and a minimum of -3G, which are sufficient to represent the movement of a person's arm in daily operations, at 20 Hz, on average. It can be compressed to about 1/3. In this embodiment, for example, compressed data for one packet capacity is stored in the storage buffer 116 and then recorded in the storage 160. As a result, the frequency of writing to the storage 160 can also be reduced.

  As described above, due to the feature of both the transmission buffer 115 and the storage buffer 116, real-time data immediately after sensing is transmitted wirelessly and recorded in the storage 160, and storage is possible if communication with an external device can be performed wirelessly or by wire. Both processes of reading and transmitting untransmitted data from 160 can be executed without delay.

  The read address 117 indicates the position in the storage 160 of untransmitted data to be transmitted when wireless or wired communication is possible.

  The write address 118 indicates a position in the storage 160 to be recorded when the data recorded in the storage buffer 116 is written to the storage 160. That is, when the read address 117 and the write address 118 have the same value, it can be determined that there is no untransmitted data to be transmitted in the storage 160.

  The storage 160 includes a data table 161 for recording sensed data. The data recorded in the data table is divided into variable lengths for each packet when transmitted from the wireless communication unit 131. As a result, after one packet of data read from the storage 160 is temporarily recorded in the storage buffer 116, processing can be reduced by enabling wireless or wired transmission without processing the data as it is.

  One packet is recorded at the position indicated by the corresponding address, and the flag and length are simultaneously recorded in the data table 161. The address is uniquely assigned in the data table 161, and one address indicates the position of one corresponding data. The flag indicates whether or not the corresponding packet has been successfully transmitted once. The length indicates the data length of the corresponding packet. The storage 160 can read or write data at an arbitrary position recorded in the storage 160 by referring to an address included in the write command read from the microcomputer 100 by serial communication.

  The length indicates the data length of the corresponding packet. That is, the address of the next recorded packet can be determined by adding the length to the address of the corresponding packet.

  When the data is transmitted after being recorded in the transmission buffer 115, 1 is written in the case of successful transmission, and 0 is written in the case of including transmission failure data. That is, when a packet in the storage 160 is read later, it can be determined whether or not untransmitted data is included, and only untransmitted data can be efficiently read without being left.

  A packet 162 indicated by the write address 118 of the RAM 110 indicates the oldest packet recorded last in the data table 161. By rewriting from the oldest data, the number of rewrites is equalized in all recording units (one cell of the memory) in the storage 160, and the rewrite frequency is reduced. As a result, even if a flash memory with a short rewrite life is applied to the storage 160, a practical life can be secured.

  A packet 164 indicated by the read address 117 of the RAM 110 indicates a packet including untransmitted data recorded last in the data table 161. Since the packet 164 includes untransmitted data, the flag is always 0. In other words. By simply reading a packet with a flag of 0 from the packet indicated by the read address 117, it is possible to read without leaving untransmitted data. The packet 163 has a flag of 1 and has been successfully transmitted once in the past.

  The real time clock 138 generates an interrupt signal to the interrupt control unit 106 of the microcomputer 100 at a constant cycle. This period can be changed by a serial communication command. With this interrupt signal, the microcomputer 100 can start the sensing process described in the sensing program 122 at a constant cycle without being affected by the execution state of other processes.

  The real time clock 138 preferably has an external input terminal. That is, by connecting the switches 141 and 142 that are buttons to the external input terminal, the microcomputer 100 can be similarly interrupted when the button of the sensor node 1 is pressed by the user. These input states can be read out to the microcomputer 100 by serial communication, and the type of button and the pressed length can be detected. By using the operations of the switches 141 and 142, the setting change of the parameter 111 can be executed.

  The external connection detection unit 132 detects that the power supply terminal 171 of the terminal 170 is connected. That is, it is possible to detect connection with an external device via a USB having a power source. When the connection is detected, the external connection detection unit 132 generates an interrupt signal to the interrupt control unit 107 of the microcomputer 100 and outputs a digital signal 1 to the I / O port 105. When a disconnection is detected, an interrupt signal is generated and a digital signal 0 is output to the I / O port 105. That is, the microcomputer 100 can immediately detect a change in the connection state to the terminal 170 and start or stop USB communication via the USB communication unit 133. Further, by controlling the switch 144 by the output of the I / O port 105 from the microcomputer 100, the communication line for serial signals can be cut off immediately when communication is stopped. This is a role of suppressing current leakage flowing from the microcomputer 100 to the USB communication unit 133 through the signal line because power is not supplied to the USB communication unit 133 when the terminal 170 is not connected.

  The USB communication unit 133 converts a serial communication signal with the microcomputer 100 into a USB standard signal via USB data terminals (transmission and reception) 172 and 173. Therefore, in the control of the microcomputer 100, only the data to be transmitted to the external device can be automatically converted to the USB standard data and transmitted to the external device only by transmitting to the USB communication unit 133 by serial communication. In addition, since the power of the USB communication unit 133 is supplied only from an external device via the power terminal 171, extra power is not consumed when the USB is connected.

  The power switching unit 145 switches the power supplied to the regulator 146 between the power supplied from the secondary battery 147 when the USB is not connected and the power supplied from the external device via the power terminal 171 when the USB is connected. Therefore, the secondary battery 147 is not consumed even when wired communication is continuously used during USB connection. A ground 148 indicates a point that becomes a reference voltage of a circuit connected to the secondary battery 147.

  FIG. 2 shows an appearance of the sensor node 1 to which the present invention is applied. In FIG. 2, the USB connection terminal 170 of the sensor node 1 is arranged on a surface different from the mounting surface on which the pulse sensor 137 is provided, so that the user can always wear it during wired communication and charging, It is characterized by not disturbing sensing. Further, since the terminal 170 is arranged on the side surface with respect to the mounting surface or the surface on which the LCD is present, and the switches 141 and 142 are not covered and can be operated, the PC operation is possible even during wired connection. It is characterized by not disturbing human daily work. Further, in consideration of not interfering with daily work, assuming that the sensor node is mounted on the left arm, it is desirable to arrange the terminal 170 so as to exist on the left side surface, and it is assumed that the terminal 170 is mounted on the right arm. For example, it is desirable to arrange the terminal 170 so as to exist on the right side surface. A wristband 2 is attached to both ends of the sensor node 1 and can be worn on the arm like a typical wristwatch. As can be seen from the structure of the band 2 in FIG. 2, the surface having the pulse sensor 137 contacts the user's skin when worn. The pulse sensor 137 is a known optical measurement method, which irradiates infrared rays onto the surface of a living body, and makes it possible to estimate the pulse from changes in reflected light caused by pulsation of blood vessels. That is, it is essential that the pulse sensor 137 is in contact with the user's skin.

  Terminal 170 is on a different side from the mounting surface on which pulse sensor 137 is located.

  Here, the wearing surface means a surface that comes into contact with the skin when the sensor node is worn on the arm (fixed to the skin). In other words, it is the opposite surface to the surface on which the LCD of FIG. 2 exists, or the back surface when it is the front surface of the sensor node. The side surface refers to any surface that is not accompanied by a wristband.

  The terminal 170 corresponds to a USB cable, and can be connected to an external device compatible with USB through a power terminal 171, data terminals (transmission and reception) 172 and 173, and a ground terminal 174, and can communicate and supply power. Further, by short-circuiting the reset terminal 175 and the ground terminal 174, it is possible to shut off the internal power supply from the outside and apply a reset. Only the electrodes of the terminal 170 are exposed and can be waterproofed.

  Further, the LCD 134 can display a time that the user can always see, a remaining battery level, a wireless communication state, and the like. By displaying a menu on the LCD 134 and operating the switches 141 and 142, the user can change the setting of the sensing interval, the wireless channel, and the like. It is also possible to execute sensing or wireless communication processing that is different from normal, triggered by pressing of the switches 141 and 142.

  FIG. 3 shows the appearance of the cradle 3 to which the present invention is applied. The cradle is an expansion device that can be connected and fixed to the sensor node body, and enables communication with a PC and charging of the sensor node 1. 3 has terminals 300 to 304 that contact the terminal 170 of the sensor node 1 shown in FIG. 2 and covers the upper part of the sensor node 1. Even when the sensor node 1 is connected, the cable 305 extending from the side and the USB connection terminal 307 can be connected to the USB port of the external device without interfering with the user's operation. Since the cradle 2 and the sensor node 1 are fixed by a fixing portion 306 having a claw-like shape, even when a user wearing the sensor node 1 moves or pulls the cable 305, the cradle 2 and the sensor node 1 are not easily detached. . In addition, the upper part in contact with the LCD is opened in a window shape so that the contents of the LCD are not obstructed.

  In addition, the side portion opposite to the cable 305 is also formed with a central portion so as not to hinder the operation of the switches 141 and 142. Therefore, even when the cradle 3 is connected, the user wearing the sensor node 1 can continue daily operations without being disturbed by sensing and various operations.

  FIG. 4 shows an external appearance when the cradle 3 to which the present invention is applied is connected to the sensor node 1. In FIG. 4, as shown in FIG. 3, the cradle 3 is connected without interfering with the user wearing the wristband 2, sensing with the pulse sensor 137, operating the switches 141 and 142, and displaying the LCD 134. Features. The size of the cradle 3 is only about 10% larger than that of the sensor node 1, and the burden on the user is the same as when only the sensor node 1 is mounted.

  FIG. 5 shows an external appearance when the sensor node 1 with the cradle 3 shown in FIG. 4 connected is worn. In FIG. 5, the cradle 3 is set in the sensor node 1 and the USB connection terminal 307 is connected to the USB port 7 of the personal computer 5, and the current time 401 displayed on the LCD 134 is displayed even during wired communication or charging. Further, a waveform 402 sensed by a pulse sensor or the like, a symbol 403 indicating that sensing is in progress, and the like can be visually recognized. That is, use of the sensor node 1 from the user 10 is not hindered even if the cradle 2 is connected.

  FIG. 6 is a block diagram of the sensor node 1, a predetermined personal computer 5 capable of receiving sensing data, and a gateway 510. In FIG. 6, a predetermined personal computer 5 receives data wirelessly transmitted from the sensor node to the base station and data transmitted by wire from the sensor node, and both data are stored in the database 502 in the same manner. The analysis / display unit 501 can perform processing.

  The personal computer 5 includes USB ports 505 and 506 for connecting devices that can communicate with USB, and a USB driver 504 that facilitates application communication via the USB ports 505 and 506 and reception via the USB driver. Recorded data in the database 502, if necessary, the wireless / wired communication unit 503 that transmits the data to the data analysis / display unit 501, the database 502 that records all sensing data by adding time information, and human activity It comprises a data analysis / display unit 501 that analyzes data sensed to derive a human health condition and the like, which can be displayed to the user. When the sensor node 1 and the personal computer 5 are connected by the cable 305, the sensor node 1 transmits a communication start request, and the wireless / wired communication unit 503 returns a response, so that data can be reliably received from the sensor node 1 side. After confirming that transmission is possible, start wired communication.

  In order to receive the data wirelessly transmitted from the sensor node to the base station and capture the data in the personal computer 5, the gateway 510 is connected by USB. The gateway 510 wirelessly communicates with the sensor node 1 via the antenna 520, the microcomputer 512 that decompresses the received data if the received data is compressed data, and transmits the compressed data to the USB communication unit 513. It is configured by a USB communication unit 513 that transmits data received by serial communication to an external device according to the USB standard, or transmits data received by USB standard by serial communication.

  FIG. 7 shows a flowchart of the process of the sensor node 1 described in the program 121 recorded in the ROM 120 of FIG. 1. In particular, the processes P101 to P105 are described in the sensing program 122, and the process P110 is a wired communication program 123. It is described in. P106 is read from the RAM 110 to determine whether the read address 117 and the read address 118 are the same, and P107 is determined from the wired connection state 113 to be in a wired connection. In P108, data is read from the storage 160 and wirelessly transmitted, and in P110, wired transmission is performed.

  In FIG. 7, even if other processes P107 to 110 are being executed by an interrupt from the interrupt control unit 106 that has received a signal from the real-time clock 138, the process P101 is immediately executed and sensing is always performed at a constant cycle. It is possible to do. That is, in response to an interrupt signal from the interrupt control unit, other processing is interrupted and sensing is executed. In other words, the accumulated sensing data can be transmitted without hindering continuous sensing. In addition, as described with reference to FIG. 12, by setting the generation timing of the interrupt signal and the processes P102 to P105 so as not to overlap, sensing and wireless transmission of the sensing data can be reliably performed. As a result, the server can collect sensing data in real time.

  The process P101 is started by an interrupt from the interrupt control unit 106, sensed by one or more of the acceleration sensor 135, the temperature sensor 136, and the pulse sensor 137, and records the sensed data in the transmission buffer 115 of the RAM 110. . After the process is completed, the process proceeds to process P102.

  The process P102 determines whether the transmission buffer 115 has a capacity capable of recording the sensed data. When the recording becomes impossible, the process proceeds to process P103, and the data recorded in the transmission buffer 115 is converted into a packet conforming to the wireless protocol and wirelessly transmitted to a predetermined gateway 510. In this way, sensing data is temporarily recorded in the transmission buffer, and wireless transmission is performed after reaching the transmission capacity. In other words, after sensing a plurality of times, a plurality of sensing data are transmitted together. As a result, it is possible to significantly reduce power consumption due to wireless transmission. Needless to say, wireless transmission can be performed for each sensing operation.

  After the process is completed, the process proceeds to process P104. The wireless transmission result (success, failure, etc.) is recorded in the wireless communication state 112. The determination of the result of radio transmission can be made based on whether or not a signal (ACK) indicating that the radio transmission has been received is received from the base station. If there is a recordable capacity, the process proceeds to process P106.

  In process P104, the wirelessly transmitted packet data is compressed by a known compression method and recorded in the storage buffer 116. The compression method to be applied is desirably a processing time sufficiently shorter than the interval at which the real-time clock 138 generates a signal when the CPU 101 of the microcomputer 100 executes the processing. This is to prevent sensing from being performed during the compression process.

  Next, in the process P105, if data for one packet capacity is accumulated in the storage buffer 116, it is recorded in the storage 160. If untransmitted data is included, the flag is set to 0; The write destination position in the storage 160 refers to the write address 118 of the RAM 110, and after the writing is completed, the write address 118 is updated to the next address. Further, since the read address 117 indicates the position of the untransmitted data to be transmitted in the storage 160, when the read address 117 is the same as the write address 118 before update and the written flag is 1, There is no untransmitted data to be read. Therefore, the read address 117 is also updated at the same time. After the process is completed, the process proceeds to process P106.

  In process P106, the read address 117 and the write address 118 recorded in the RAM 110 are compared. If the addresses are different, the process proceeds to process P107. If the addresses are the same, the process proceeds to process P109. That is, it is determined whether there is a packet including untransmitted data. If the read address 117 and the write address 118 are the same, it can be determined that all the packets recorded in the storage 160 have been transmitted.

  The process P107 refers to the wired connection state 113 of the RAM 110. If the wired connection is ON, the process proceeds to process P108, and if OFF, the process proceeds to process P110.

  The process P108 reads a packet including untransmitted data, and transmits the packet wirelessly if the flag corresponding to the packet is 0. When transmission is successful and a packet including untransmitted data exists in the storage 160, reading and wireless transmission are repeated and executed. The read address 117 of the RAM 110 is referred to for the position of the packet to be read. If the wireless transmission fails or there is no packet including untransmitted data in the storage 160, the process P108 proceeds to the process P109. If an interrupt from the interrupt control unit 106 occurs during the execution of the process P108, the process is stopped and the process P101 is started.

  The process P110 reads a packet including untransmitted data, and transmits the packet by wire if the flag corresponding to the packet is 0. When wired communication is possible and a packet including untransmitted data exists in the storage 160, reading and wired transmission are repeatedly executed. The read address 117 of the RAM 110 is referred to for the position of the packet to be read. If the process P110 cannot perform wired transmission or there is no packet including untransmitted data in the storage 160, the process proceeds to process P109. If an interrupt from the interrupt control unit 106 occurs during the execution of the process P110, the process is stopped and the process P101 is started.

  In process P109, the clock of the microcomputer 110 is stopped, and a low power standby state is set. In the standby state, it can be activated by an interrupt from the interrupt control units 106 and 107. Therefore, the power consumption can be greatly reduced by setting the time when there is no necessary processing to standby and starting only the timing necessary for the processing. However, referring to the wired connection state 113 of the RAM 110, if it is ON, power is supplied from the outside, so there is no need to enter standby. This is because the battery 147 is not consumed.

  In the present embodiment, the example in which the sensor node voluntarily transmits data that could not be wirelessly transmitted has been described. It is also possible to transmit data that could not be wirelessly transmitted by the sensor node receiving a command from the server or by a user specifying it via a switch of the sensor node. Further, in the present embodiment, an example of transmitting data that could not be transmitted wirelessly has been described, but, for example, even when the server requests retransmission of data that has been successfully transmitted wirelessly, as in the above-described flow, Successful data can be transmitted by wireless communication or wired communication.

  FIG. 8 shows a flowchart of processing for detecting a wired connection state described in the wired communication program 123 of the ROM 120 of FIG. In FIG. 8, the interrupt control unit 107 receives a signal from the external connection detection unit 132 to interrupt other processing, and only the values of the wired connection state 113 and the wired communication state 114 recorded in the RAM 110 are displayed. It is characterized by switching immediately. In other words, whether USB connection / disconnection is detected, whether the external device is connected via USB (wired connection state), the external device is connected via USB, and the external device of the other party It is characterized by determining whether or not the device can receive data (wired communication state) and recording the determination result. Therefore, since it is not necessary to perform a connection detection process when data is transmitted by wired communication, it is possible to shorten the time from when the USB connection is detected until the actual wired communication is started. As a result, the time required for a series of operations for collecting data can be shortened.

  The process P201 is started by an interrupt from the interrupt control unit 107, and the process P202 refers to the wired connection state 113 recorded in the RAM 110. If wired connection is in progress, the process proceeds to process P203, and if not wired connection, the process proceeds to process P213.

  The process P203 refers to the output state of the external connection detection unit input to the I / O port 105, and if the external power supply is detected, the process shifts to the process P207 (Y), and the external power supply is detected. If not, the process proceeds to process P204 (N).

  The process P213 refers to the output state of the external connection detection unit input to the I / O port 105 in the same manner as the process P203. If the external power supply is detected, the process P213 proceeds to process P214 (Y). If no external power source is detected, the process proceeds to process P206 (N).

  The process P204 controls the output of the I / O port 105, controls the switch 144, cuts off the serial communication signal line with the USB communication unit 133, and prevents current leakage. After the process is completed, the process proceeds to process P205.

  Process P214, contrary to process P204, controls the output of the I / O port 105 after detecting the external power supply, controls the switch 144, and connects the signal line for serial communication with the USB communication unit 133. Enable communication. After the process is completed, the process proceeds to process P215.

  In process P205, the clock frequency of the microcomputer 100 is set to a low speed state. This is to reduce power consumption when power is supplied from the internal secondary battery 147 without USB connection. After the process is completed, the process proceeds to process P206.

  The process P215 sets the clock frequency of the microcomputer 100 to a high speed state. This is because when the power is supplied from an external device through USB connection, the consumption of the internal secondary battery 147 can be ignored, and thus the communication speed is maximized. After the process is completed, the process proceeds to process P216.

  In process P216, ON is written in the wired connection state 113 of the RAM 110, and the process proceeds to process P207.

  In process P217, OFF is written in the wired connection state 113 and the wired communication state 114 of the RAM 110, and the process proceeds to process P207.

  In the process P207, the process returns to the interrupted process before the process P201 is started.

  FIG. 9 shows the process P110 of FIG. 7 in detail, and is a process of reading the data recorded in the storage 160 and transmitting it by wire. In FIG. 9, when a packet including untransmitted data exists in the storage 160, the data is read and wired until a signal is received from the real-time clock 138 and an interrupt is issued from the interrupt control unit 106 or the USB is disconnected. It is characterized in that the transmission process is continuously repeated. That is, it is possible to wire-transmit data as fast as possible without affecting the sensing timing.

  The storage data wired transmission process is started from process P301, and the process proceeds to process P302.

  The process P302 refers to the wired communication state 114 of the RAM 110. If the process P302 is ON, the process P302 proceeds to the process P306 and starts reading data. If it is OFF, the process proceeds to process P303.

  The process P303 transmits a communication start request by wire, and waits for a response from an external device that is a connection partner until the process P304. This is because even if the USB is connected, there is a possibility that it cannot be correctly received unless the external device as a partner is the personal computer 5 that performs a predetermined receiving operation.

  Since the process P304 starts the wired communication only when there is a response to the communication start request, the process P304 proceeds to the process P305. Therefore, since data can be transmitted only to a predetermined personal computer 5 without transmitting data to an external device that cannot receive data, unnecessary data transmission can be avoided. Thereby, data to be collected is not lost. If there is no response, the process proceeds to process P313, the wired communication state 114 of the RAM 110 is rewritten to OFF, and the storage data wired transmission process is completed (P312).

  In process P305, ON is written in the wired communication state 114 of the RAM 110, and the process proceeds to process P306 to start reading data.

  The process P306 reads a packet including untransmitted data from the storage 160. With reference to the read address 117 of the RAM 110, only the packet whose correspondence flag is 0 is read, and the process proceeds to process P307.

  Process P307 controls the DMAC 102 and starts reading the next packet. Before proceeding to process P308 and starting wired transmission, reading of the next packet is started, so that wired transmission and reading of the packet are simultaneously performed. Since wired transmission is not limited by waiting for completion of packet reading, the data transmission speed can be maximized.

  The process P309 refers to the wired connection state 113 of the RAM 110 after the process P308 is completed. If the connection is cut off halfway, it can be detected because OFF is rewritten in the wired connection state 113 by the interrupt processing shown in FIG. If the wired connection state 113 is ON, the read address 117 is updated in process P310, and the process proceeds to process P311. If it is OFF, the process proceeds to process P312 and the storage data wired transmission process is completed.

  In process P311, with reference to the read address 117 and the write address 118 of the RAM 110, if they are the same, it is considered that there is no untransmitted data in the storage 160, and the process proceeds to process P312 to complete the storage data wired transmission process. If they are different, the process proceeds to process P307 to start reading the next data.

  FIG. 10 shows the process P108 of FIG. 7 in detail, and is a process of reading the data recorded in the storage 160 and wirelessly transmitting it. In FIG. 10, when a packet including untransmitted data exists in the storage 160, the data is read out wirelessly until a signal is received from the real-time clock 138 and an interrupt is issued from the interrupt control unit 106 or wireless transmission fails. It is characterized in that the transmission process is continuously repeated. That is, data can be wirelessly transmitted as fast as possible without affecting the sensing timing.

  The storage data wireless transmission process is started from process P401, the process proceeds to process P402, and the wireless communication state 112 of the RAM 110 is referred to. If the wireless communication state 112 is successful, the process proceeds to process P403, and a packet including untransmitted data is read from the storage. For the reading position, the reading address 117 of the RAM 110 is referred to, and only the packet whose corresponding flag is 0 is read. After the process is completed, the process proceeds to process P404. If the wireless communication state 112 is unsuccessful, the process proceeds to process P408 to complete the storage data wireless transmission process.

  In process P404, the packet read out in process P403 is wirelessly transmitted. After the transmission is completed, the process proceeds to process P405 to wait for reception of ACK from the base station as a response to the transmission. If ACK is received, the process proceeds to process P406, and the flag corresponding to the read address 117 of the RAM 110 is 0. The process proceeds to the position of a certain next packet, and the process proceeds to process P407. If ACK is not received, the process proceeds to process P408, and the storage data wireless transmission process is completed.

  In process P407, the read address 117 and the write address 118 of the RAM 110 are referred to and compared. If the addresses are different, the process proceeds to process P403 to read the next data from the storage. If the addresses are the same, the process proceeds to process P408 to complete the storage data wireless transmission process.

  FIG. 11 shows a communication flow when the sensor node 1 and the personal computer 5 perform wired communication. In FIG. 11, not only a connection process similar to that of a normal USB device is executed between the sensor node 1 and the personal computer 5, but also a predetermined communication start request is reliably made by exchanging a unique communication start request. It is possible to send data to an application.

  When the sensor node 1 and the personal computer 5 are connected via USB in step 601, the USB driver 504 of the personal computer 5 recognizes the USB communication unit 133 of the sensor node 1 (step 602). Next, when the sensor node 1 is supplied with power from the personal computer 5 via USB as a trigger, a signal is sent from the external connection detection unit 132 to the microcomputer 100, and an interruption occurs in the microcomputer 100 (step 603). Using the interrupt as a trigger, the microcomputer 100 transmits a communication start request to the USB communication unit 133 by serial communication (step 604). The communication start request is transferred to the USB driver 504 of the personal computer 5 at step 605, and further transferred to the wireless / wired communication unit 503 at step 606. Upon receiving the communication start request in step 606, the wireless / wired communication unit 503 transmits a response (step 607). The response is transferred from the USB driver 504 to the USB communication unit 133 of the sensor node 1 in step 608 and transferred to the microcomputer 100 in step 609. As a result, the microcomputer 100 can determine that data can be reliably wired. If there is no response, the communication start request is retransmitted at a constant cycle (for example, 1 second cycle). Therefore, when wired communication becomes possible on the PC side, communication can be started immediately.

  When the microcomputer 100 determines that the communication is possible, the microcomputer 100 transmits a read command designating the read position to the storage 160 in step 610, and then starts reading packets in step 611. In step 612, the microcomputer 100 controls the DMAC 102, transmits a read command for the next packet, and starts reading in step 613. The reading in step 613 is executed by the DMAC 102, and the microcomputer 100 simultaneously starts transmitting the packet read in step 611 to the USB communication unit 133 (step 614). The packet received by the USB communication unit 133 is transferred to the USB driver 504 of the personal computer 5 at step 615 and transferred to the wireless / priority communication unit 503 at step 616. If there is a packet including untransmitted data in the storage 160 and the USB has not been disconnected, the wired transmission of data is repeated in steps 617 to 621 in the same manner. As a result, the wireless / priority communication unit 503 can receive the data sensed by the sensor node 1, and can record the data in the database 502 and further transfer it to a predetermined application.

  12 to 14 show the interrupt signal 701 of the real-time clock 138, the current 702 flowing from the secondary battery 147, and the signal 703 of data received by the personal computer 5 in the same time series. 12 to 14 show advantageous characteristics regarding power consumption and communication speed when data is transmitted from the sensor node 1 by wired communication.

  FIG. 12 illustrates a case where sensing is performed at a frequency of 20 hertz by the acceleration sensor 135, and the sensed three-axis acceleration data (each 1 byte) is recorded in the transmission buffer 115 of the RAM 110 and then wirelessly transmitted. . However, it is assumed that there is no untransmitted data in the storage 160. Under these conditions, wireless transmission has a 1-second period.

  The interrupt signal 701 from the real time clock 138 is generated with a frequency of 20 Hz, that is, with a period of 50 milliseconds. The time required for one sensing (P101) is typically 1 millisecond or less, as shown in the enlarged display 710. On the other hand, as shown in the enlarged display 720, wireless transmission (P103) typically requires about 10 milliseconds per packet of 100 bytes according to IEEE 802.15.4. If sensing (P101), compression (P104), and writing to storage 160 (P105) are executed at the same timing, typically 15 milliseconds are required. This is sufficiently small for one second of the transmission cycle. Therefore, the average current consumed is 1 milliampere or less, and even a typical small secondary battery can operate for several days. Reference numeral 703 denotes a signal indicating wirelessly transmitted data, which is a signal received by the base station, transmitted from the base station to the PC, and received by the PC.

  FIG. 13 is similar to FIG. 12, but illustrates a case where the storage 160 includes untransmitted data. In this case, in an environment where wireless transmission is possible, since all packets including untransmitted data in the storage 160 are continuously read and transmitted until the transmission is completed, the current 702 during this period averages 10 milliamperes or more. Since this is one digit or more larger than that in the case of FIG. 12, the influence on the battery life is great. Further, as shown in the enlarged display 730, it takes about 12 milliseconds to read a packet including untransmitted data from the storage 160 (process 403) and wirelessly transmit (process 404). Therefore, the shortest wireless transmission period of one packet is limited to 12 milliseconds.

  FIG. 14 is the same as FIG. 13, but illustrates a case where the gateway 1 and the personal computer 5 are connected by USB, and also shows a current 704 from an external power source, unlike FIGS. 12 and 13. When the USB is connected, the current 704 from the external power supply is supplied, so the current 702 from the internal secondary battery 147 is not consumed. Therefore, reading of packets including untransmitted data from the storage 160 shown in FIG. 13 and current consumption associated with transmission do not matter.

  In the enlarged display 740 from FIG. 14 shown in FIG. 15, reading from the storage 160, storage in the storage buffer 116, and transmission from the USB communication unit 133 are shown in detail. In FIG. 15, by using the DMAC 102, it is possible to execute data reading from the storage 160 and transmission from the USB communication unit 133 in parallel, and there is no need for the USB communication to wait for data reading. , Maximizing communication speed. As a result, when the USB communication speed is set to 1 megabit / second and the serial communication clock of the storage 160 and the microcomputer 100 is set to a typical value of 1 megahertz or more, the transmission cycle of one packet is about 1.5 milliseconds. Can be shortened. This can be shortened to about 1/8 compared to the case where the wireless communication described in FIG. 13 is used.

  FIG. 16 shows the structure of a wireless packet 800 and a wired packet 810. In FIG. 16, a wired packet is characterized in that compressed data having a variable length is transmitted with a fixed maximum length assumed. In this case, when the process of reading data from the storage 160 and transferring it to the USB communication unit 133 is executed using the DMAC 102, the process of reading the length information and adjusting the data length to be transferred is omitted. This is because can be processed at high speed. In addition, the increase in the transmission time due to the increase in the amount of transmission data with a fixed length is sufficiently small compared to the processing time for adjusting the data length. It is.

  Also, the header part (for example, preamble 811 and synchronization 812) added to the wired packet 810 is less than half the length of the header part (for example, PHY header 801 and MAC header 802) added to the wireless packet. Thus, the amount of data to be transmitted can be substantially reduced.

  FIG. 17 shows a detailed configuration of the power supply switching unit 145 in the block diagram shown in FIG. In the power supply switching unit 145, the switch 191 is connected to the secondary battery 147 and the regulator 146 when the external power supply is not connected. Furthermore, current leakage from the secondary battery 147 is prevented by the diodes 192 and 193. When the external power supply is connected, the switch 191 is cut off, and power is supplied from the external power supply to the regulator 146 through the diode 193.

  FIG. 18 shows a sensor network system that collects and analyzes sensing data from the sensor node 1. In FIG. 18, the user 10 wearing the sensor node 1 collects data in the personal computer 5 by wireless or wired communication, and further collects the information by a server 550 that manages information of a plurality of users via the Internet 560. It is characterized by doing.

  Note that the base station that receives the sensing data wirelessly transmitted by P103 and the base station that receives the storage data wirelessly transmitted by P108 may be the same or different. In addition, the PC wired to the base station and the PC wired to the sensor node may be the same or different.

  The server 550 includes a database 551 that records sensing data 552 of a plurality of users, a data analysis unit 553 that reads and analyzes arbitrary information from the database 551 and derives a health condition, and the analysis results and information of the database 551 as user information. The data display unit 554 can be displayed. The display screen generated by the data display unit 554 can be viewed from the user's personal computer 5 via the Internet 560 via a general web browser or the like.

  FIG. 19 shows the display on the LCD 134 of the sensor node 1 when the USB is not connected. While wearing the sensor node 1, the user 10 can check the waveform display 402 of sensing data, the time information 403, the radio wave state 404, the remaining battery capacity 405, and the remaining memory capacity 406. The mode display 401 represents the mode currently being executed, and FIG. 19 shows that the pulse is being measured.

  The radio wave status 404 indicates the result of radio transmission, and is displayed based on the radio communication status 112 of the RAM 110. It is not displayed when no wireless communication is used.

  The battery remaining amount 405 is displayed based on a value obtained by converting the voltage of the secondary battery 147 detected by the voltage detection unit 140 into a digital value by the A / D converter 104. As a result, the user 10 can know when charging is required by USB connection.

  The remaining memory capacity 406 indicates the amount of untransmitted data that can be recorded in the storage 160 and is displayed based on the difference between the read address 117 and the write address 118 of the RAM 110. Accordingly, the user 10 can estimate the time during which untransmitted data can be recorded in the storage 160 in an environment where wireless or wired communication is not possible.

  FIG. 20 shows the display on the LCD 134 of the sensor node 1 at the time of USB connection. While wearing the sensor node 1, the user 10 can check the waveform display 402 of sensing data, time information 403, USB communication status 407, power supply status 408, and remaining memory 406.

  The USB communication status 407 indicates that wired transmission is being performed via the USB, and is displayed based on the wired communication status 114 of the RAM 110.

  The power supply state 408 indicates that power is being supplied from the outside via the USB, and is displayed based on the wired connection state 113 of the RAM 110.

  FIG. 21 is a block diagram of the sensor node 1 according to the second embodiment to which the present invention is applied. In addition to the configuration of the block diagram of FIG. 1, FIG. 21 includes an EEPROM 180 that is rewritable in bytes and has a long rewritable life, unlike the large-capacity flash memory that is applied to the storage 160. Can be backed up.

  As a result, even when the information in the RAM 110 disappears due to the voltage drop of the secondary battery 147, the information backed up after charging can be read from the EEPROM 180 and recovered. These backups can be recorded in the storage 160 to which a flash memory or the like is applied, but a large-capacity flash memory has a large rewrite unit and a short rewrite life, so it is suitable for applications in which a small amount of data is frequently rewritten. Absent.

  In this configuration, the parameter 111, the read address 117, and the write address 118 are backed up in the EEPROM 180. When the read address 117 and the write address 118 are not held, it is necessary to search for packets including untransmitted data and the order of recording from all data in the storage 160. Therefore, the addition of the EEPROM 180 can significantly reduce the startup time after the battery of the sensor node 1 is exhausted.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made, and it is possible to appropriately combine the above-described embodiments. It will be understood by the contractor.

  According to the present invention, since it is possible to continue measuring biological information and recording sensing data at a fixed period, it is necessary to acquire continuous sensing data in order to grasp the user's health condition, living activity history, etc. Can be applied to sensor nodes.

An example of the block diagram of the sensor node which is one Embodiment of this invention. An example of the external view of the sensor node which is one Embodiment of this invention. An example of the external view of the cradle which carries out wired connection with the sensor node which is one Embodiment of this invention. An example of the external view which attached the cradle to the sensor node which is one Embodiment of this invention. An example of the external view which attaches a cradle to the sensor node which is one Embodiment of this invention, and senses. An example of the block diagram of the sensor node which is one Embodiment of this invention, a personal computer, and a gateway. An example of the flowchart of the basic operation | movement of the sensor node which is one Embodiment of this invention. An example of the flowchart of the switching process of the wired connection of the sensor node which is one Embodiment of this invention. An example of the flowchart of the process which reads data from the storage in the sensor node which is one Embodiment of this invention, and wire-transmits. An example of the flowchart of the process which reads data from the storage in the sensor node which is one Embodiment of this invention, and radio-transmits. An example of the figure which shows the communication flow in the case of performing wired communication between the sensor node which is one Embodiment of this invention, and a personal computer. An example of the figure which shows the consumption time in the operation | movement when there is no unsent data in storage, and the time change of communication in the sensor node which is one Embodiment of this invention. FIG. 6 is an example of a diagram illustrating current consumption and communication time change in an operation when a wired connection is not established in a case where there is untransmitted data in a storage in a sensor node according to an embodiment of the present invention. FIG. 6 is an example of a diagram illustrating current consumption and communication time change in an operation at the time of wired connection when there is untransmitted data in the storage in the sensor node according to the embodiment of the present invention. An example of the figure which shows the detail of wired communication in case the sensor node which is one Embodiment of this invention has unsent data in storage. An example of the figure which shows the structure of the wire and radio | wireless packet in the sensor node which is one Embodiment of this invention. An example of the figure which shows the detail of a structure of the power supply switching part in the sensor node which is one Embodiment of this invention. 1 is an example of a diagram illustrating a configuration of a sensor network system according to an embodiment of the present invention. An example of the LCD display at the time of non-wired connection in the sensor node which is one Embodiment of this invention. An example of the LCD display at the time of wired connection in the sensor node which is one Embodiment of this invention. An example of the block diagram of the sensor node which is one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sensor node 2 Wristband 3 Cradle 5 Personal computer 101 Central processing part 102 Direct memory access controller 138 Real time clocks 141-144, 191 Switch 145 Power supply switching part 146 Regulator 150 Antenna 192, 193 Diode 300-304 USB terminal 305 USB cable 306 USB terminal 502 database

Claims (20)

A sensor for measuring biological information and obtaining sensing data;
A wireless communication unit that wirelessly transmits the sensing data to the server;
A first memory for recording the sensing data as a backup;
A control unit that performs measurement by the sensor, wireless transmission by the wireless communication unit, and transmission of sensing data recorded as the backup to the server;
A clock for generating signals at predetermined intervals;
An interrupt control unit for generating a first interrupt signal based on the clock,
When the control unit receives the first interrupt signal, the control unit performs measurement by the sensor in preference to transmission of the sensing data recorded as the backup. The sensor node according to claim 1,
The control unit is a sensor node that executes transmission of sensing data recorded as the backup without interfering with measurement by the sensor. The sensor node according to claim 1,
When the control unit receives the first interrupt signal, the control unit interrupts transmission of the sensing data recorded as the backup and performs measurement by the sensor. The sensor node according to claim 1,
A sensor node in which the timing at which the interrupt control unit generates the first interrupt signal does not overlap with the timing of wireless transmission by the wireless communication unit. The sensor node according to claim 1,
After acquiring the sensing data a plurality of times, the wireless communication unit wirelessly transmits the sensing data for a plurality of times. The sensor node according to claim 1,
An external connection detection unit that detects a wired connection with an external device and a wired communication unit;
When the wired connection is detected, the control unit executes transmission of the sensing data recorded as the backup by the wired communication unit to the external device,
When the wired connection is not detected, the control unit performs wireless transmission of the sensing data recorded as the backup by the wireless communication unit to the server. The sensor node according to claim 6,
When the control unit receives a second interrupt signal based on the detection of the wired connection, the control unit transmits a communication start request to the external device via the wired communication unit, and receives a response signal from the external device. A sensor node that starts transmitting the sensing data recorded as the backup by the wired communication unit to the external device. The sensor node according to claim 6,
A sensor node further comprising a power supply switching unit that switches power supplied to the sensor node from power supplied from a battery built in the sensor node to power supplied from the external device when the wired connection is detected. The sensor node according to claim 6,
A terminal for connecting to the external device and a band for fixing the sensor node to the skin;
When the sensor node is fixed to the skin, the sensor is disposed on a surface that contacts the skin, and the terminal is disposed on a side surface not associated with the band. The sensor node according to claim 1,
A parameter that defines the operation of the sensor node, a read address that indicates a storage location of sensing data indicating a transmission failure by the wireless communication unit among the sensing data recorded in the first memory, and the sensing data are recorded. A sensor node further comprising a second memory for storing a write address indicating a storage position to be stored. A wristwatch type sensor node,
A sensor for measuring biological information and obtaining sensing data;
A terminal for wired connection to an external device that is the transmission destination of the sensing data;
A display device disposed on the surface of the wristwatch,
The sensor is disposed on a surface opposite to the surface on which the display device exists,
The terminal is a sensor node arranged on a side surface with respect to a surface on which the display device exists. The sensor node according to claim 11, comprising:
When the sensor node is attached to the left arm, the terminal is a sensor node disposed on the left side surface. The sensor node according to claim 11, comprising:
The sensor node is connected to a cradle that covers the surface, and is connected to the external device via a connection terminal and a cable arranged on a side of the cradle. A sensor for measuring biological information to acquire sensing data; a wireless communication unit for wirelessly transmitting the sensing data to a server; a memory for recording the sensing data as a backup; a measurement by the sensor; and a wireless communication unit A control unit that performs wireless transmission and transmission of the sensing data recorded as the backup to the server, a clock that generates a signal at a predetermined interval, and a rate that generates a first interrupt signal based on the clock. A sensor node having a control unit;
A base station that receives wireless transmission of sensing data by the wireless communication unit and transmits the sensing data to the server via a first external device;
A server that analyzes sensing data from the first external device to be received and sensing data recorded as the backup, and
When the control unit receives the first interrupt signal, the control unit performs measurement by the sensor in preference to transmission of sensing data recorded as the backup. The sensor network system according to claim 14.
The said control part is a sensor network system which performs transmission of the sensing data recorded as said backup, without interfering with the measurement by the said sensor. The sensor network system according to claim 14.
When the control unit receives the first interrupt signal, the control unit interrupts transmission of the sensing data recorded as the backup and performs measurement by the sensor. The sensor network system according to claim 14.
The sensor network system in which the timing at which the interrupt control unit generates the first interrupt signal does not overlap with the timing of wireless transmission by the wireless communication unit. The sensor network system according to claim 14.
The sensor node further includes an external connection detection unit and a wired communication unit that detect a wired connection with the second external device,
When the wired connection is detected, the control unit executes transmission of the sensing data recorded as the backup by the wired communication unit to the second external device,
When the wired connection is not detected, the control unit performs wireless transmission of sensing data recorded as the backup by the wireless communication unit to the base station. The sensor network system according to claim 18,
The sensor network system, wherein the first external device and the second external device are the same. The sensor network system according to claim 18,
When the control unit receives a second interrupt signal based on the detection of the wired connection, the control unit transmits a communication start request to the second external device via the wired communication unit, and responds from the second external device. A sensor network system that starts transmitting the sensing data recorded as the backup by the wired communication unit to the second external device when a signal is received.

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