JP2010072776A - Data management system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To avoid data loss in data communication by radio communication, without enhancing the search time or the load. <P>SOLUTION: In a terminal, most of data defects are preliminarily complemented by wirelessly retransmitting data for which an "Acknowledgement signal" cannot be received from a base station of radio-transmitted data. Thereafter, a management server searches for data defects, and issues, when a data defect is still left, a retransmission instruction of the data defect to the terminal. According to this, the data loss can be avoided without increase in communication quantity or load. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a data management method and a data transmission / reception method.

  Recently, a small wireless terminal (hereinafter referred to as a sensor node) equipped with a sensor and a power source has been developed, and a network system (hereinafter referred to as a sensor network system) that captures various information in the real world in an information processing device in real time by the sensor node. R & D is progressing. This sensor network system is a network system whose purpose is to sense people, things, and the environment and acquire information on the site in real time. The sensor network system has built-in wireless functions and a power supply (battery) in the sensor node, which eliminates the need for wiring and power terminals, simplifying the installation, and where sensors could not be installed. Can be installed.

  A sensor network system generally includes a sensor node, a base station, an intranet / Internet, and a server. The sensor node is installed in a person / thing / environment and performs appropriate sensing. The sensor node ID information is also added to the sensing data, a wireless packet including these data is created, and the sensor node transmits to the base station wirelessly. The base station adds information such as a time stamp and base station ID to the data transmitted by the sensor node, and then transfers this data to the server via the intranet / Internet. The server manages data of the entire sensor network system such as sensing data, sensor node ID, time stamp, and base station ID.

  In addition, in recent years, an application for acquiring human activity level and interaction in an organization and human biometric information by using such a sensor network system is also considered.

  On the other hand, when the sensor node performs wireless communication with the base station, the sensing data may not reach the base station if the sensor node is away from the base station or the wireless communication state is unstable. At this time, a part of the sensing data managed in the server may be lost.

  In providing a service based on the degree of human activity and interaction in the organization as described above, as well as on the human biological information, the loss of data may cause a decrease in the reliability and accuracy of the service.

  As a method for compensating for this data loss, Patent Document 1 discloses a technique in which sensor nodes collectively transmit data stored in a memory when a wireless communication state is suitable for data transmission. ing.

  Patent Document 2 discloses a technique in which a server searches for a lack of sensing data managed by itself and retransmits the missing sensing data to a sensor node.

JP2007-184754 JP 2008-71157 A

  The technique disclosed in Patent Document 1 is a method of performing retransmission when a wireless communication state is suitable for data transmission. However, although data arrives at the base station, the sensing data managed by the server may be lost. Specifically, there is a possibility that data may be lost due to network disconnection, power shutdown, an unexpected bug in the program, etc. in the base station, between the base station and the management server, or in the management server. For this reason, the technique disclosed in Patent Document 1 does not reliably prevent loss of sensing data.

  On the other hand, in the technique disclosed in Patent Document 2, the server searches the sensor data for missing sensing data, and causes the sensor node to retransmit the missing data. However, when missing data is distributed discontinuously in accumulated sensing data, it takes time to search for the missing data, and the processing load on the server increases. In addition, the data amount of the command for designating the missing data becomes large, which may affect the communication band.

Of the inventions disclosed in this application, the outline of typical ones will be briefly described as follows.
A terminal having a sensor for obtaining sensing data, a recording unit for recording the sensing data as a backup, and a wireless communication unit for wirelessly transmitting the sensing data to the base station, wirelessly communicating with the terminal, receiving the sensing data A base station having a transmission / reception unit for transmitting to the server; a transmission / reception device for receiving sensing data from the base station; a server having a control unit for managing sensing data; and a recording device for recording sensing data managed by the control unit; When the wireless communication environment between the terminal and the base station is in a good state, the wireless communication unit of the terminal collectively transmits the sensing data recorded as a backup to the base station, and then the control unit of the server Search for missing sensing data recorded in the recording device and resend the missing sensing data to the terminal. The cell command is a data management system for issuing to the terminal.

  According to the present invention, even when a mobile sensor terminal is used, it is possible to reduce the time for checking the presence / absence of observation data in the management server and the amount of data of a retransmission command issued to the sensor node, and obtain observation data without any loss Can do. It is possible to prevent loss of observation data stored in the management server without increasing the communication volume or load.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  In order to clarify the position and function of the sensor node in the present invention, a business microscope system will be described first. Here, a business microscope is a sensor node that is attached to a person, observes the situation of the person, and illustrates the relationship between persons and the current organization's evaluation (performance) as organizational activities to help improve the organization. System. In addition, data related to face-to-face detection, behavior, voice, and the like acquired by the sensor node is generically referred to as organization dynamics data.

  FIG. 1 is an explanatory diagram showing the overall flow of processing executed in a business microscope system according to one embodiment. Although shown separately for the sake of illustration, the respective processes shown are executed in cooperation with each other. From the acquisition of organizational dynamics data (BMA) by multiple name tag type sensor nodes (NNa, NNb --- NNi, NNj), the relationship between persons and the evaluation (performance) of the current organization are analyzed as organizational activities (BMC) The flow until display (BMD) is performed.

  First, tissue dynamics data acquisition (BMA) will be described with reference to FIG. The name tag type sensor node A (NNa) includes sensors such as an acceleration sensor (ACC), an infrared transmitter / receiver (TRIR), a microphone (MIC), a screen (IRD) for displaying face-to-face information obtained from the infrared transmitter / receiver, and Although not shown, it has a microcomputer and a wireless transmission function.

  The acceleration sensor (ACC) detects the acceleration of the name tag type sensor node A (NNa) (that is, the acceleration of the person A (not shown) wearing the name tag type sensor node A (NNa)). The infrared transmitter / receiver (TRIR) detects a facing state of the name tag type sensor node A (NNa) (that is, a state in which the name tag type sensor node A (NNa) faces another name tag type sensor node). The name tag type sensor node A (NNa) faces another name tag type sensor node because the person A wearing the name tag type sensor node A (NNa) wears another name tag type sensor node. Indicates that they are facing each other. The microphone (MIC) detects the sound around the name tag type sensor node A (NNa).

  The system of the present embodiment includes a plurality of name tag type sensor nodes (name tag type sensor node A (NNa) to name tag type sensor node J (NNj) in FIG. 1). Each name tag type sensor node is attached to one person. For example, the name tag type sensor node A (NNa) is attached to the person A, and the name tag type sensor node B (NNb) is attached to the person B (not shown). This is to analyze the relationship between persons and to illustrate the performance of the organization.

  Note that the name tag type sensor node B (NNb) to the name tag type sensor node J (NNj) also have sensors, a microcomputer, and a wireless transmission function in the same manner as the name tag type sensor node A (NNa). In the following description, when the description applies to any of the name tag type sensor node A (NNa) to the name tag type sensor node J (NNj), and when it is not necessary to particularly distinguish these name tag type sensor nodes, Type sensor node (NN).

Each name tag type sensor node (NN) performs sensing by sensors at all times (or repeatedly at short intervals). Each name tag type sensor node (NN) transmits the acquired data (sensing data) by radio at a predetermined interval. The interval at which data is transmitted may be the same as the sensing interval or may be larger than the sensing interval. The data transmitted at this time is given a sensing time and a unique identifier (ID) of the sensed name tag type sensor node (NN). The reason why the wireless transmission of data is executed collectively is to maintain the usable state of the name tag type sensor node (NN) for a long time while being worn by a person by suppressing the power consumption by the transmission. Further, it is desirable for the later analysis that the same sensing interval is set in all the name tag type sensor nodes (NN).
<Overall configuration of business microscope system>
Next, with reference to FIG. 2A and FIG. 2B, the entire configuration of the sensor network system that realizes the business microscope system of the embodiment will be described. Two types of arrows in FIG. 2A and FIG. 2B, which are different in shape, represent time synchronization, association, storage of acquired sensing data, data flow for data analysis, and control signals, respectively. Yes.

  The business microscope system includes a business card type sensor node (NN), a base station (GW), a sensor network server (SS), an application server (AS), and a client (CL). Each function is realized by hardware, software, or a combination thereof, and a functional block is not necessarily accompanied by a hardware entity.

  FIG. 2A shows a configuration of a name tag type sensor node (NN) which is an embodiment of the sensor node, and the name tag type sensor node (NN) transmits and receives a plurality of infrared rays for detecting a human face-to-face situation. Parts (TRIR1 to TRIR4), a triaxial acceleration sensor (ACC) for detecting the wearer's movement, a microphone (MIC) for detecting the wearer's speech and surrounding sounds, and for detecting the front and back of the name tag type sensor node Various sensors such as illuminance sensors (LS1F, LS1B) and temperature sensors (THM) are mounted. The sensor to be mounted is an example, and other sensors may be used to detect the face-to-face condition and movement of the wearer.

  In this embodiment, four sets of infrared transmission / reception units are mounted. The infrared transceivers (TRIR1 to TRIR4) continue to transmit terminal information (TRMT), which is unique identification information of the name tag type sensor node (NN), periodically in the front direction. When a person wearing another name tag type sensor node (NNm) is positioned substantially in front (for example, front or oblique front), the name tag type sensor node (NN) and the other name tag type sensor node (NNm) Terminal information (TRMT) is exchanged by infrared rays. For this reason, it is possible to record who is facing who.

  Each infrared transmission / reception unit is generally composed of a combination of an infrared light emitting diode for infrared transmission and an infrared phototransistor. The infrared ID transmission unit IrID generates TRMT that is its own ID and transfers it to the infrared light emitting diode of the infrared transmission / reception module. In this embodiment, all the infrared light emitting diodes are turned on simultaneously by transmitting the same data to a plurality of infrared transmission / reception modules. Of course, independent data may be output at different timings.

  The data received by the infrared phototransistors of the infrared transmission / reception units TRIR1 to TRIR4 is ORed by an OR circuit (IROR). That is, if the ID is received by at least one of the infrared light receiving sections, the name tag type sensor node recognizes the ID. Of course, a configuration having a plurality of ID receiving circuits independently may be employed. In this case, since the transmission / reception state can be grasped with respect to each infrared transmission / reception module, it is also possible to obtain additional information, for example, in which direction the other name tag type sensor node facing each other is.

  The physical quantity SENSD detected by the sensor is stored in the storage unit STRG by the sensor data storage control unit (SDCNT). The physical quantity is processed into a transmission packet by the radio communication control unit TRCC and transmitted to the base station GW by the transmission / reception unit TRSR.

  At this time, the communication timing control unit TRTMG generates a physical transmission timing by taking out the physical quantity SENSD from the storage unit STRG. The communication timing control unit TRTMG has a plurality of time bases for generating a plurality of timings.

  In addition to the physical quantity SENSD currently detected by the sensor, the data stored in the storage unit includes physical quantity CMBD accumulated in the past and data FMUD for updating the firmware that is the operation program of the name tag type sensor node.

  The name tag type sensor node (NN) of the present embodiment detects that the external power source (EPOW) is connected by the external power source connection detection circuit (PDET), and generates an external power source detection signal (PDETS). The time base switching unit (TMGSEL) that switches the transmission timing generated by the timing control unit (TRTMG) or the data switching unit (TRDSEL) that switches data to be wirelessly communicated by the external power supply detection signal (PDETS) is unique to this embodiment. It is the composition. In FIG. 2A, as an example, a configuration in which the time base switching unit TMGSEL switches between two time bases of time base 1 (TB1) and time base (TB2) by an external power supply detection signal PDETS is illustrated as a transmission timing. Yes. In addition, a configuration in which the data switching unit TRDSEL is switched by the external power detection signal PDETS from the physical quantity data SENSD obtained from the sensor, the physical quantity data CMBD accumulated in the past, and the firmware update data FMUD as the data to be communicated is illustrated. Yes.

  The illuminance sensors (LS1F, LS1B) are mounted on the front surface and the back surface of the name tag type sensor node (NN), respectively. The data acquired by the illuminance sensors LS1F and LS1B are stored in the storage unit STRG by the sensor data storage control unit SDCNT, and at the same time are compared by the turnover detection unit (FBDET). When the name tag is correctly worn, the illuminance sensor LS1F mounted on the front surface receives external light, and the illuminance sensor LS1B mounted on the back surface is sandwiched between the name tag type sensor node body and the wearer. Because of the positional relationship, no extraneous light is received. At this time, the illuminance detected by LS1F takes a larger value than the illuminance detected by LS1B. On the other hand, when the name tag type sensor node is turned over, the LS1B receives extraneous light and the LS1F faces the wearer. Therefore, the illuminance detected by the LS1B is larger than the illuminance detected by the LS1F.

  Here, by comparing the illuminance detected by the LS1F and the illuminance detected by the LS1B by the turnover detection unit FBDET, it can be detected that the name tag node is turned over and is not correctly mounted. When turning over is detected by FBDET, a warning sound is generated by the speaker SP to notify the wearer.

  A microphone (MIC) acquires audio information. The surrounding information such as “noisy” or “quiet” can be known from the sound information. Furthermore, by acquiring and analyzing the voices of people, whether communication is active or stagnant, whether they are communicating with each other equally or unilaterally, whether they are angry or laughing, Etc. can be analyzed. Furthermore, the face-to-face state in which the infrared transmitter / receiver TRIR could not be detected due to the standing position of a person or the like can be supplemented by voice information and acceleration information.

  The voice acquired by the microphone MIC acquires both a voice waveform and a signal obtained by integrating the voice waveform by the integration circuit AVG. The integrated signal represents the energy of the acquired speech.

  The triaxial acceleration sensor (ACC) detects the acceleration of the node, that is, the movement of the node. For this reason, from the acceleration data, it is possible to analyze the intensity of the movement of the person wearing the name tag type sensor node and the behavior such as walking. Further, by comparing the acceleration values detected by a plurality of name tag type sensor nodes, it is possible to analyze the communication activity level, mutual rhythm, mutual correlation, etc. between persons wearing those name tag type sensor nodes.

  In the name tag type sensor node of this embodiment, the data acquired by the three-axis acceleration sensor ACC is stored in the storage unit STRG by the sensor data storage control unit SDCNT, and at the same time, the direction of the name tag is detected by the up / down detection circuit UDDET. . This is based on the fact that two types of acceleration detected by the three-axis acceleration sensor are observed: dynamic acceleration change due to the wearer's movement and static acceleration due to the gravitational acceleration of the earth.

  When the name tag type sensor node is worn on the chest, the display device LCDD displays personal information such as the affiliation and name of the wearer. In other words, it behaves as a name tag. On the other hand, when the wearer holds the name tag type sensor node in his / her hand and points the display device LCDD toward the user, the turn of the name tag type sensor node is reversed. At this time, the content displayed on the display device LCDD and the function of the button are switched by the vertical detection signal UDDETS generated by the vertical detection circuit UDDET. In the present embodiment, an example is shown in which the information displayed on the display device LCDD is switched between the analysis result of the infrared activity analysis (ANA) generated by the display control DISP and the name tag display DNM according to the value of the up / down detection signal UDDETS. Yes.

  When an infrared transmitter / receiver (TRIR) transmits / receives an infrared ID between nodes, whether a name tag type sensor node has faced another name tag type sensor node, that is, a person wearing a name tag type sensor node) It is detected whether or not the person wearing the name tag type sensor node is faced. For this reason, it is desirable that the name tag type sensor node is mounted on the front part of the person. As described above, the name tag type sensor node further includes a sensor such as an acceleration sensor (ACC). The sensing process in the name tag type sensor node corresponds to the organization dynamics data acquisition (BMA) in FIG.

  In many cases, there are a plurality of name tag type sensor nodes, each of which is connected to a close base station (GW) to form a personal area network (PAN).

  The temperature sensor (THM) of the name tag type sensor node (NN) acquires the temperature of the place where the name tag type sensor node is located, and the illuminance sensor (LS1F) acquires the illuminance such as the front direction of the name tag type sensor node (NN). As a result, the surrounding environment can be recorded. For example, it is possible to know that the name tag type sensor node (NN) has moved from one place to another based on temperature and illuminance.

  As input / output devices corresponding to the worn person, buttons 1 to 3 (BTN1 to 3), a display device (LCDD), a speaker (SP) and the like are provided.

  The storage unit (STRG) is specifically composed of a nonvolatile storage device such as a hard disk or a flash memory, and includes terminal information (TRMT) that is a unique identification number of the name tag type sensor node (NN), a sensing interval, and a display Operation settings (TRMA) such as output contents are recorded. In addition, the storage unit (STRG) can temporarily record data and is used to record sensed data. When there is no storage data area, the sensor data storage control unit deletes the old data in order based on the time recorded in association with the sensing data, and the new data is preferentially stored.

  The communication timing control unit (TRTMG) is a clock that holds time information and updates the time information at regular intervals. The time information periodically corrects the time by the time information GWCSD transmitted from the base station (GW) in order to prevent the time information from deviating from other name tag type sensor nodes.

  The sensor data storage control unit (SDCNT) controls the sensing interval of each sensor according to the operation setting (TRMA) recorded in the storage unit (STRG), and manages the acquired data.

  Time synchronization acquires time information from the base station (GW) and corrects the clock. Time synchronization may be executed immediately after an associate described later, or may be executed in accordance with a time synchronization command transmitted from the base station (GW).

  When transmitting / receiving data, the radio communication control unit (TRCC) controls the transmission interval and converts it into a data format compatible with radio transmission / reception. If necessary, the wireless communication control unit (TRCC) may have a wired communication function instead of wireless communication. The radio communication control unit (TRCC) may perform congestion control so that transmission timing does not overlap with other name tag type sensor nodes (NN).

  The associate (TRTA) transmits / receives a request TRTAQ and a response TRTAR for forming a personal area network (PAN) with the base station (GW) shown in FIG. ). Associate (TRTA) is when the power of the name tag type sensor node (NN) is turned on, and when the name tag type sensor node (NN) is moved, transmission / reception with the base station (GW) is interrupted. To be executed. As a result of the association (TRTA), the name tag type sensor node (NN) is associated with one base station (GW) in the near range where the radio signal from the name tag type sensor node (NN) reaches.

  The transmission / reception unit (TRSR) includes an antenna and transmits and receives radio signals. If necessary, the transmission / reception unit (TRSR) can perform transmission / reception using a connector for wired communication. Data TRSRD transmitted / received by the transmission / reception unit TRSR is transferred to and from the base station (GW) via the personal area network (PAN).

  The base station (GW) shown in FIG. 2B has a role of mediating between the name tag type sensor node (NN) and the sensor network server (SS). A plurality of base stations (GWs) are arranged so as to cover areas such as living rooms and workplaces in consideration of wireless reach.

  The base station (GW) includes a transmission / reception unit (BASR), a storage unit (GWME), a clock (GWCK), and a control unit (GWCO).

  The transceiver unit (BASR) receives radio from the name tag type sensor node (NN), and performs wired or radio transmission to the base station (GW). Furthermore, the transmission / reception unit (BASR) includes an antenna for receiving radio waves.

  The storage unit (GWME) is configured by a nonvolatile storage device such as a hard disk or a flash memory. The storage unit (GWME) stores at least operation setting (GWMA), data format information (GWMF), terminal management table (GWTT), and base station information (GWMG). The operation setting (GWMA) includes information indicating an operation method of the base station (GW). The data format information (GWMF) includes information indicating a data format for communication and information necessary for tagging the sensing data. The terminal management table (GWTT) is the terminal information (TRMT) of the subordinate nameplate type sensor nodes (NN) that can be currently associated and the local information distributed to manage those nameplate type sensor nodes (NN). Includes ID. The base station information (GWMG) includes information such as the address of the base station (GW) itself. The storage unit (GWME) temporarily stores updated firmware (GWFW) of the name tag type sensor node.

  The storage unit (GWME) may further store a program executed by a central processing unit CPU (not shown) in the control unit (GWCO).

  The clock (GWCK) holds time information. The time information is updated at regular intervals. Specifically, the time information of the clock (GWCK) is corrected by the time information acquired from an NTP (Network Time Protocol) server (TS) at regular intervals.

  The control unit (GWCO) includes a CPU (not shown). When the CPU executes a program stored in the storage unit (GWME), sensing data sensor information acquisition timing, sensing data processing, transmission / reception to the name tag type sensor node (NN) and sensor network server (SS) It manages the timing and timing of time synchronization. Specifically, when the CPU executes a program stored in the storage unit (GWME), the wireless communication control / communication control unit (GWCC), terminal management information correction (GWTF), associate (GWTA), time synchronization Processing such as management (GWCD) and time synchronization (GWCS) is executed.

  The wireless communication control / communication control unit (GWCC) controls the timing of communication with the name tag type sensor node (NN) and the sensor network server (SS) by wireless or wired. Further, the wireless communication control / communication control unit (GWCC) distinguishes the type of received data. Specifically, the wireless communication control / communication control unit (GWCC) determines whether the received data is general sensing data, data for association, time synchronization response, or the like. Identify from the part and pass the data to the appropriate function respectively.

  The wireless communication control / communication control unit (GWCC) refers to the data format information (GWMF) recorded in the storage unit (GWME), converts the data into a format suitable for transmission / reception, and the type of data Data format conversion (GWDF) is performed to add tag information for indicating

  The associate (GWTA) transmits a response TRTAR to the associate request TRTAQ sent from the name tag type sensor node (NN), and transmits a local ID assigned to each name tag type sensor node (NN). When the associate is established, the associate (GWTA) performs terminal management information correction (GWTF) for correcting the terminal management table (GWTT).

  Time synchronization management (GWCD) controls the interval and timing for executing time synchronization, and issues a command to synchronize time. Alternatively, the sensor network server (SS), which will be described later, executes time synchronization management (GWCD), so that the command can be sent from the sensor network server (SS) to the base station (GW) of the entire system. .

  Time synchronization (GWCS) connects to an NTP server (TS) on the network, and requests and acquires time information. Time synchronization (GWCS) corrects the clock (GWCK) based on the acquired time information. Then, the time synchronization (GWCS) transmits a time synchronization command and time information (GWCSD) to the name tag type sensor node (NN).

  The sensor network server (SS) in FIG. 2B manages data collected from all name tag type sensor nodes (NN). Specifically, the sensor network server (SS) stores data sent from the base station (GW) in a database, and also senses data based on requests from the application server (AS) and the client (CL). Send. Further, the sensor network server (SS) receives a control command from the base station (GW), and returns a result obtained from the control command to the base station (GW).

  The sensor network server (SS) includes a transmission / reception unit (SSSR), a storage unit (SSME), and a control unit (SSCO). When time synchronization management (GWCD) is executed by the sensor network server (SS), the sensor network server (SS) also requires a clock.

  The transmission / reception unit (SSSR) transmits and receives data with the base station (GW), the application server (AS), and the client (CL). Specifically, the transmission / reception unit (SSSR) receives the sensing data transmitted from the base station (GW) and transmits the sensing data to the application server (AS) or the client (CL).

  The storage unit (SSME) is configured by a non-volatile storage device such as a hard disk or flash memory, and stores at least a performance database (SSMR), data format information (SSMF), a sensing database (SSDB), and a terminal management table (SSTT). . Further, the storage unit (SSME) may store a program executed by a CPU (not shown) of the control unit (SSCO). Further, in the storage unit SSME, the updated firmware (SSFW) of the name tag type sensor node stored in the terminal firmware registration unit (TFI) is temporarily stored.

  The performance database (SSMR) is a database for recording an evaluation (performance) regarding an organization or an individual inputted from a name tag type sensor node (NN) or existing data together with time data. The performance database (SSMR) is the same as the performance database (PDB) of FIG. This performance data is input from a performance input unit (MRPI).

  In the data format information (SSMF), a data format for communication, a method of separating sensing data tagged with a base station (GW) and recording it in a database, a method for responding to a data request, and the like are recorded. Yes. As will be described later, this data format information (SSMF) is always referred to by the communication control unit (SSCC) after data reception and before data transmission, and data format conversion (SSDF) and data distribution (SSDS) are performed. Done.

  In the sensing database (SSDB), sensing data acquired by each name tag type sensor node (NN), information of the name tag type sensor node (NN), and sensing data transmitted from each name tag type sensor node (NN) have passed. It is a database for recording information of a base station (GW) and the like. A column is created for each data element such as acceleration and temperature, and the data is managed. A table may be created for each data element. In either case, all data is managed in association with terminal information (TRMT), which is the ID of the acquired name tag type sensor node (NN), and information regarding the acquired time.

  The terminal management table (SSTT) is a table that records which name tag type sensor node (NN) is currently managed by which base station (GW). When a name tag type sensor node (NN) is newly added under the management of the base station (GW), the terminal management table (SSTT) is updated.

  The control unit (SSCO) includes a central processing unit CPU (not shown) and controls transmission / reception of sensing data and recording / retrieving to / from a database. Specifically, the CPU executes a program stored in the storage unit (SSME), thereby executing processing such as communication control (SSCC), terminal management information correction (SSTF), and data management (SSDA).

  The communication control unit (SSCC) controls the timing of communication with the base station (GW), application server (AS), and client (CL) by wire or wireless. In addition, as described above, the communication control unit (SSCC) determines the data format in the sensor network server (SS) based on the data format information (SSMF) recorded in the storage unit (SSME). Convert to a format or a data format specialized for each communication partner. Furthermore, communication control (SSCC) reads the header part which shows the kind of data, and distributes data to a corresponding process part. Specifically, received data is distributed to data management (SSDA), and a command for correcting terminal management information is distributed to terminal management information correction (SSTF). The destination of the data to be transmitted is determined by the base station (GW), application server (AS) or client (CL).

  The terminal management information correction (SSTF) updates the terminal management table (SSTT) when receiving a command for correcting the terminal management information from the base station (GW).

  Data management (SSDA) manages correction / acquisition and addition of data in the storage unit (SSME). For example, by data management (SSDA), sensing data is recorded in an appropriate column of a database for each data element based on tag information. Even when the sensing data is read from the database, processing such as selecting necessary data based on the time information and the terminal information and rearranging in order of time is performed.

  In FIG. 1, the sensor net server (SS) organizes and records the data received via the base station (GW) in the performance database (SSMR) and the sensing database (SSDB) by data management (SSDA). Corresponds to tissue dynamics data alignment (BMB).

  The application server (AS) shown in FIG. 2B analyzes and processes sensing data. The application server (AS) is connected to the sensor network server (SS) and the client (CL) via a network (NW).

  Upon receiving a request from the client (CL), or automatically at the set time, the analysis application (ASA) is activated. The analysis application (ASA) sends a request to the sensor network server (SS) to acquire necessary sensing data. Further, the analysis application (ASA) analyzes the acquired data and returns the analyzed data to the client (CL). Alternatively, the analysis application (ASA) may record the analyzed data as it is in the analysis database (ASMD). The analyzed data is displayed on the display device of the application server, client terminal, or sensor node. Analyzing and displaying the sensing data corresponds to analysis (BMC) and display (BMD) in FIG.

The characteristics of the data management method of the present invention will be described with reference to FIG. The transmission / reception data (TRSRD) from the node can include a sensing sequence number range notification. The base station that has received the sensing sequence number range notification transfers it to the sensor network server (SS) as it is. The sensor network server (SS) that has received the sensing sequence number range notification searches the sensing database (SSDB) of the storage unit (SSME) unit in the data management (SSDA) unit. When data loss is found in the sensing database (SSDB), the data management (SSDA) unit designates the missing data and issues a command to the sensor node to retransmit the missing data.
<Appearance of business microscope name tag type sensor node>
FIG. 3 is an external view showing an example of the structure of the name tag type sensor node. The name tag type sensor node is used by attaching a neck strap or a clip to the strap attaching portion NSH and attaching it to a person's neck or chest.

  The surface with the strap attachment portion NSH is defined as the upper surface, and the opposite surface is defined as the lower surface. In addition, when a name tag type sensor node is mounted, a surface facing the other party is defined as a front surface, and a surface facing the front surface is defined as a back surface. Further, a surface located on the left side when viewed from the front of the name tag type sensor node is defined as a left side, and a surface facing the left side is defined as a right side. (A) is a top view, (b) is a front view, (c) is a bottom view, (d) is a back view, and (e) is a left side view.

  As shown in the front view of FIG. 3B, a liquid crystal display device (LCDD) is arranged in front of the name tag type sensor node. The contents displayed on this liquid crystal display device are displayed as a name tag for the wearer's affiliation and name when facing the other party, as described later, and when facing the wearer, it is worn. Organization activity feedback data for employees.

  The surface material of the name tag type sensor node is transparent so that the card CRD inserted therein can be seen from the outside through the case material. The design of the name tag surface can be changed by exchanging the card (CRD) inserted in the name tag type sensor node.

  As described above, the real name tag type sensor node can be worn by a person just like a general name tag, and it is possible to acquire a physical quantity by the sensor without making the wearer feel uncomfortable.

  The LED lamps LED1 and LED2 in the top view and the front view of FIGS. 4A and 4B are used to notify the wearer and the person facing the wearer of the state of the name tag type sensor node. LED1 and LED2 are guided to the front surface and the upper surface, and in a state where the name tag type sensor node is worn, the lighting state can be visually recognized from both the wearer and the person facing the wearer.

  As described above, the name tag type sensor node incorporates the speaker SP, and is used to notify the wearer and the person facing the wearer of the state of the name tag type sensor node by a buzzer or voice. The microphone MIC acquires the speech of the name tag type sensor node wearer and surrounding sounds.

  The illuminance sensors LS1F and LS1B are respectively arranged on the front surface and the back surface of the name tag type sensor node. It is detected from the illuminance value acquired by LS1F and LS1B that the attached name tag type sensor node is turned over, and the wearer is notified.

  As is clear from FIG. 5E, three buttons BTN1, BTN2, and BTN3 are arranged on the left side of the name tag type sensor node, and the wireless communication operation mode is changed and the liquid crystal display screen is switched. .

  On the lower surface of the name tag type sensor node, a power switch PSW for switching on / off the power of the name tag type sensor node, a reset button RBTN for resetting the activation program of the name tag type sensor node, a cradle connector CRDIF for connecting the cradle, An external expansion connector EXPT is provided. The cradle has a charger function, and when a name tag type sensor node is connected to the cradle, power is constantly supplied from the outside. In this embodiment, the cradle is installed in a place where the wireless communication state is good so that there is no obstacle that interferes with wireless communication in the vicinity of the wireless communication area of the base station.

  A plurality of infrared transmission / reception units TRIR1 to TRIR1 are arranged in front of the name tag type sensor node. It is a structure peculiar to the name tag type sensor node of the present embodiment that a plurality of infrared transmission / reception units are provided. It has the function of intermittently transmitting the identification number (TRMT) of the name tag type sensor node itself by infrared rays and receiving the identification number transmitted by the name tag type sensor node worn by the person in contact. As a result, when and which name tag type sensor node has faced each other is recorded, it is possible to detect the face-to-face situation between the wearing humans. The embodiment shown in FIG. 3 shows an example in which four infrared transmission / reception units TRIR1 to TRIR1 are arranged on the upper part of the sensor node.

  FIG. 4 is a system block diagram according to the first embodiment of the present invention. The feature of FIG. 4 is that each sensor node performs wireless communication with one of a plurality of base stations. With this configuration, the current position information of the sensor node can be acquired for each base station, and the load on one base station can be reduced.

  The embodiment of FIG. 4 includes a plurality of sensor nodes SN (SN1, SN2, SN3, SN4), a plurality of cradle CRs (CR1, CR2, CR3, CR4), a base station BS (BS1, BS2), an intranet / Internet. It consists of NW and server SEVER. The sensor node SN and the base station BS are connected by wireless communication WR. The intranet / Internet NW between the base station and the server is wired or wireless communication.

  The sensor node performs sensing at regular intervals. In the case of acceleration, for example, in the case of acceleration, sampling is performed in three axes x, y, and z at 50 Hz for 2 seconds. For example, the sampling values are acquired in the order of x, y, and z, and then acquired in time series. In addition, the first sampling time is set as the time stamp value of the sensing. All sensed data is stored in a memory mounted on the sensor node. After sensing, the sensor node stores sensing data in a wireless transmission frame.

  FIG. 5 is an example of how to assign a sensing sequence number in the present invention. In the present embodiment, the sequence number and the sensing sequence number are provided separately. Thereby, when a loss of sensing data occurs, the management server can distinguish whether it is a frame-by-frame loss or a loss of the entire data of one cycle. Thereby, the time required for the management server to search for missing data can be shortened, and the processing load can be reduced.

  Specifically, sensor nodes that perform intermittent operation at a predetermined cycle assign the same sensing sequence number to data sensed at the same cycle. The sensing sequence number is incremented by 1 for each sensing period.

  The amount of sensing data during one cycle may exceed the data amount of one frame that is a wireless transmission unit in this embodiment. The sensing data in that case is wirelessly transmitted by dividing the frame. At this time, since the sensing sequence number included in each wireless frame is sensing during the same period, the same sensing sequence number is assigned.

  The sensor node is equipped with a plurality of types of sensors and performs sensing. In the example shown in FIG. 5, four types of sensing data of infrared rays, acceleration, voice energy, and voice zero cross (a value in which the scalar amount of the voice data passes a predetermined value near 0) are transmitted. Of these, infrared is transmitted in one frame, and in other cases, acceleration is transmitted in 5 frames, audio energy is transmitted in 2 frames, and audio zero cross is transmitted in 2 frames. At this time, the same value “1” is entered in the sensing sequence numbers of all frames. The sequence number is incremented by 1 for each radio transmission frame. Accordingly, the sequence numbers are 1 to 10 for the first frame to the 10th frame in the first period, respectively. The same applies to the second and subsequent cycles.

  In FIG. 6, the operation of each system element according to the present embodiment will be described. The sensor node operates intermittently and stores data observed in one cycle in a radio frame. In addition to sensing data, the wireless frame includes the type of sensing data, the sensing data sequence number, the wireless transmission sequence number, the unique ID of the sensor node, a time stamp, and the like.

  The sensor node causes the sensor unit, the wireless unit microcomputer, and the like to enter a sleep mode (sleep state) during a time period when sensing or wireless transmission is not performed. When a certain period of time elapses due to the timer, the microcomputer is returned to the normal mode (starting state) to perform sensing and wireless communication.

  FIG. 6 shows an example in which sensing data observed during one period is divided into 5 frames (6-01, 6-02, 6-03, 6-04, 6-05) and wirelessly transmitted. . In these five frames, the sequence numbers of the sensing data are the same, and the sequence numbers of wireless transmission are increasing by 1 in ascending order in the order of transmission.

  Whether or not this wireless transmission has succeeded is determined by whether or not the sensor node has received an Acknowledgment signal (a signal indicating that sensing data has been received) returned by the base station wireless unit (6-RFGW1). If the sensor node does not receive an Acknowledgment signal from the base station even after a certain time has passed even though the sensor node has performed wireless transmission, the sensor node determines that the wireless transmission has failed and transmits a transmission failure flag. And the radio frame data is stored in the memory. Here, the transmission failure flag is data indicating whether the Acknowledgment signal from the base station has not been received, that is, data indicating whether wireless transmission has failed. However, the sensor node stores the data of the wireless frame in the memory even when the wireless transmission is successful. At that time, the transmission failure flag is not assigned and is distinguished from this.

  In this 5-frame divided wireless transmission, since the time interval of each divided transmission is shorter than normal wireless transmission (for example, when sensing is performed once every 10 minutes and wireless transmission is performed), the probability of failure in wireless transmission / reception becomes higher than normal . Here, a case where transmission of the third divided frame (6-03) has failed will be described as an example.

  The radio frame transmitted by the sensor node is received by the base station radio unit. The radio frame received by the base station radio unit is transferred to the base station host (6-HGW1). Note that FIG. 6 shows an example in which the base station functions include a base station radio unit that performs radio communication with the sensor node, a base station host that performs processing and management of sensing data, and other devices. Also, it can be configured as an integral device.

  The base station host combines the divided frames of the same sensing data type assigned the same sensing sequence number. In FIG. 6, the first divided frame (6-11) and the second divided frame (6-12) are combined into a frame (6-21) to form a fourth divided frame (6-14) and five divided frames. The eye frame (6-15) is combined to form a frame (6-24). This is to collectively manage sensing data that could not be transmitted in one frame due to restrictions on wireless communication. It is also possible to perform frame combination processing in the management server.

  Of the divided frames assigned with the same sensing sequence number, regarding the third divided frame (6-13) that has not reached the base station host, a NULL value is substituted into the sensing data area of the frame portion and the divided frame is assigned. Join. At this time, a NULL flag (6-10) indicating that data is missing is assigned to the combined frames. The NULL flag may contain any value as long as it can be recognized. Here, since the minimum size of each field in the radio frame is assumed to be 1 byte, the value is set to “FF”.

  In the base station host, the IP address of the base station host and the port number information used for communication with the base station radio unit are added to the data received from the sensor node. Thereby, it is possible to know which base station radio unit and which base station host the data of the sensor node has passed. Thus, the divided frames transmitted from the sensor node are combined, added with the above information, and transmitted to the management server.

  The management server receives data transmitted from the base station host. After giving the reception time, it is stored line by line in the DB table. The DB table is divided for each type of sensing data and for each date of sensing time. In the example of FIG. 6, the sensing data partially includes NULL.

  When the sensor node (6-SN3) is connected to the cradle (6-CR1), sensing data to which a transmission failure flag is assigned among sensing data stored in the memory triggered by being connected to the cradle Will be sent again.

  This transmission is continuously transmitted in order from the data with the oldest sensing time. This series of retransmissions is hereinafter referred to as node-initiated batch transmission (6-3). In node-initiated batch sending, if there are one or more frames for which transmission failed during divided transmission with the same sensing period, all the divided frames are transmitted again. A node-driven batch transmission flag is assigned to data transmitted by node-driven batch transmission.

  In this way, by transmitting the sensing data collectively using the connection to the cradle as a trigger, it is possible to transmit in an environment where the wireless communication state is good. In other words, when the wireless communication environment with the base station is in a good state, it is detected by connection with the cradle and batch sending is started. Furthermore, since power is always supplied from an external power source by being connected to the cradle, there is no shortage of power during the batch sending, and sensing data can be transmitted reliably.

  The data transmitted by the node-initiated batch transmission is transmitted from the base station radio unit (6-RFGW2) to the management server via the base station host in the same manner as the normal data. The management server stores the data transmitted by node-initiated batch sending in a DB table.

  When the node-led batch sending is completed, the sensor node wirelessly transmits a sensing sequence number range notification (6-4). This is for informing the management server which data the sensor node holds, and is designated by the latest sensing sequence number value and the oldest sensing sequence number value held by the sensor node. The management server that has received the sensing sequence number range searches the DB for sensing data within the sensing sequence number range.

  The management server searches for missing data within the range of the sensing sequence number in the DB using the sensor node ID included in the immediately preceding sensing sequence number range notification as a key. The missing data is determined based on whether the sensing sequence number is continuous or non-continuous, and whether or not a NULL flag is present.

  The management server issues a retransmission command to the sensor node regarding the missing data (6-23). The missing data is specified by the sensing sequence number. That is, the management server issues a retransmission command by designating a sensing sequence number corresponding to data including a defect. In FIG. 6, 6-23 is a missing part in the sensing data stored in the DB table. The DB table row including 6-23 includes a NULL flag (6-20). For this reason, the management server issues a server-led batch sending request to the sensor node so as to retransmit the sensing data of this row (6-5).

  The sensor node that has received this request transmits again the sensing data of the requested sensing sequence number. This series of retransmissions is hereinafter referred to as server-initiated batch transmission (6-6).

  The server-initiated collective sending (6-4) to (6-6) is repeated until there is no loss in the sensing data within the sensing sequence number range.

  When the sensing data within the range of the sensing sequence number is no longer missing, the management server issues a server-initiated batch sending completion notification to end the server-led batch sending (6-7). The sensor node that has received the server-initiated batch sending completion notification shifts to the sleep state.

  In this way, among the data that has already been wirelessly transmitted, the data in which the node has not received the Acknowledgment signal from the base station is wirelessly transmitted in advance to compensate for most data loss first, and then the management server Data loss can be avoided without increasing the amount of traffic and the load on the management server by searching for data loss and issuing a data loss resend command to the terminal if there is still data loss It becomes.

  FIG. 7 shows an example of a data loss distribution of sensing data. Here, the minimum unit for representing which data is missing is 2 bytes.

  FIG. 7A shows a case where data is continuously lost in a certain time zone. At this time, when the management server issues a retransmission command to the sensor node, in order to indicate which data is missing, it is only necessary to specify the values of the sensing sequence number at the beginning of the missing and the sensing sequence number at the end of the missing. Good. That is, a data size of 4 bytes is required to indicate which data is missing.

  On the other hand, FIG. 7B shows a case where data is missing at N locations discontinuously. At this time, when the management server issues a retransmission command to the sensor node, N pairs of sensing sequence numbers at the start of loss and sensing sequences at the end of loss are required to indicate which data is missing. It becomes. That is, when data loss is discontinuously distributed, a data size of 4 bytes × N is required to specify the missing data, and a large amount of data is required.

  In a sensor network system typified by a business microscope system, many people have sensor nodes, and the amount of data wirelessly transmitted from one sensor node increases as described with reference to FIG. On the other hand, when a person who possesses the sensor node moves and moves in and out of the wireless communication area of the base station, the data communication amount of the wireless communication varies randomly. Therefore, the tendency of the actual data loss distribution is closer to FIG. 7 (b) than FIG. 7 (a).

  In this way, when data loss is discontinuously distributed as shown in FIG. 7B, if all the missing data is to be complemented by a command from the management server, the processing load on the management server increases, and The amount of communication increases and affects the communication band. Therefore, when the wireless communication environment is in a good state, most of the missing data is compensated by transmitting the sensing data recorded as a backup by the sensor node, and then the missing data compensation command is transmitted from the server. When the sensor node that has received the complement command transmits sensing data having a defect, it is possible to complement the data defect part without increasing the communication amount or the load.

  FIG. 8 is a state transition diagram of the sensor node regarding the collective feed in the present embodiment. In the normal operation state (8-1), when it is inserted into the cradle, a cradle connection flag (data indicating connection to the cradle) is wirelessly transmitted (8-2), and then the node-led batch sending state (8-3). ).

  Thereafter, the node wirelessly transmits the latest sensing sequence number and the oldest sensing sequence number among the sensing data stored in its own memory (sensing sequence number range notification) (8-4).

  Thereafter, the sensor node transitions to a standby state (8-5). In the standby state (8-5), when a batch sending request command is received within a certain time, a command response is returned (8-6), and the state is shifted to the server-led batch sending state (8-7). In the standby state (8-5), when a batch transmission request command is not received within a predetermined time, a sensing sequence number range notification is again wirelessly transmitted (8-8). At this time, the remaining retry count is decreased by one. Here, the remaining number of retries is the number of times that the retransmission of the sensing sequence number range notification is allowed, and is set in advance in the sensor node.

  In the server-initiated batch sending state (8-7), when transmission of the batch sending data is completed, the remaining retry count is decreased by 1, and a sensing sequence number range notification is wirelessly transmitted (8-9), and then the standby state (8 Transition to -5).

  When the remaining number of retries becomes 0, or when the node receives a server-led batch sending completion notification, a server-led batch sending end notification is sent to the management server (8-10), and the node is in a standby state ( 8-5) to the sleep state (8-11). As described above, when the remaining number of retries becomes 0, transition to the sleep state can eliminate the influence on communication between other sensor nodes and the management server. That is, the wireless band of another sensor node can be secured.

  While in the sleep state (8-11), it periodically wakes up while connected to the cradle and performs heartbeat wireless transmission (8-12). Thereby, it is possible to notify the base station and the management server that the sensor node is in a normal state. When the cradle is removed, the cradle disconnection flag (data indicating disconnection from the cradle) is transmitted (8-13), and then the state transits to the normal operation state (8-1).

  In this way, by sending a sensing sequence number range notification after completion of node-initiated batch sending, it becomes possible to identify the data currently held by the sensor node, and the management server limits the range for searching for missing data it can.

  FIG. 9 is a state transition diagram of the management server related to batch sending in the present embodiment. After receiving the sensing sequence number range notification in the standby state (9-1), the state transits to the DB check state (9-2). In the DB check state, the sensing data of the DB is searched for the sensing sequence number within the range specified by the sensing sequence number range notification from the sensor node. If there is no data loss within the specified range (9-3), the state transits to a summary sending end notification issuance state (9-4), wirelessly transmits a server-initiated summary sending end notification, and then enters a standby state ( Transition to 9-1).

  As a result of the DB check, when there is data loss and there are more than a predetermined number (for example, 7) of commands being issued to the base station at that time (9-5), a command empty waiting state (9-6) ). When the number of commands being issued is less than a predetermined number (for example, 7) in the command waiting state (9-7), a transition is made to a batch sending request command issuing state (9-8). Also, if there is data loss as a result of the DB check and the number of commands issued to the base station at that time is less than a predetermined number (for example, 7) (9-9), the batch sending request command Transition to issue state. In this way, when the number of commands being issued is greater than or equal to a predetermined number, by shifting to the command idle state, communication congestion is avoided when sending commands from the management server to the base station and sensor node, and Commands can be delivered reliably.

  In the batch sending request command issuing state, after issuing the batch sending request command, the state transits to a command response reception waiting state (9-10). In the command response reception waiting state, when a batch sending request command response is received from the sensor node within a predetermined time (9-11), the state transits to the batch sending receiving state (9-12). If the batch sending request command response is not received within a predetermined time, the state transits to the batch sending request command issuing state (9-13), and the batch sending request command is issued again.

  When the collective feed data is received from the sensor node in the collective feed reception state, the data is stored in the DB (9-14). On the other hand, when a sensing sequence number range notification is received from the sensor node (9-15), the remaining retry count is decreased by 1 (9-16), and if the remaining retry count is greater than 0, the state is shifted to the DB check state. . When the remaining number of retries is 0, the state transits to a batch sending end notification issuance state (9-4).

  In the collective feed reception state (9-12), when the collective feed data is not received even after a predetermined time has elapsed (9-17), the remaining retry count is decreased by 1 (9-18), and the remaining retry count is greater than zero. In this case, a transition is made to the batch sending request command issue state (9-8). When the remaining number of retries is 0, the state transits to a summing end notification issuance state (9-4), wirelessly transmits a server-led summarization end notification, and then transitions to a standby state (9-1). Here, the remaining number of retries is the number of times that re-execution of the DB check or reissuance of the batch sending request command is allowed, and is set in the management server in advance.

  As described above, the management server confirms the DB based on the sensing sequence number range transmitted from the sensor node, and when there is missing data, transmits a command for causing the sensor node to retransmit the missing data. . Thereby, the sensing data with a defect | deletion can be complemented. In addition, when issuing a batch sending request command once, the management server issues one sensor by issuing a batch sending end notification when the number of remaining retries is decreased by 1 and the number of remaining retries becomes zero. It is possible to avoid continuing communication related to batch sending with only the node. That is, communication with other sensor nodes can be ensured.

  FIG. 10 is a sequence diagram at the time of normal batch feed in the present embodiment. When the node is inserted into the cradle (10-1), the node wirelessly transmits a cradle connection flag (10-2). This data is stored in the DB (10-3).

  After wirelessly transmitting the cradle connection flag (10-2), the node performs node-led batch sending (10-4). This data is stored in the DB (10-5).

  The node that has finished the node-led batch sending (10-4) wirelessly transmits a sensing sequence number range notification (10-6). The management server that has received this searches the DB for data loss of the sensing data of the sensing sequence number within the range specified in the sensing sequence number range notification (10-7). As a result of the search, the sensing sequence number of the missing data is recorded, and a collective sending request command (10-8) including a combination of the sensing start sequence number and missing sensing sequence number is created for continuous data loss.

  The base station that has received the batch sending request command (10-8) converts the batch sending request command (10-8) into a batch sending request command (10-9) in a wireless format and transmits it to the sensor node.

  The node that has received the batch sending request command (10-9) returns a batch sending request command response (10-10) to the base station. Further, at this time, the node performs the collective sending (10-11) from the data with the oldest sensing time for each sensing data type shown in FIG. This summary feed data is stored in the DB (10-12).

  Once this collective sending ends, the node wirelessly transmits a sensing sequence number range notification (10-13), and decreases the remaining retry count by one. The management server that received this checks again for data loss in the DB (10-14).

  When the number of remaining retries in the sensing sequence number range notification becomes 1 (10-15), the node performs DB check (10-16). After checking the DB, the management server transmits a batch sending request command (10-17). The node receiving the batch sending request command (10-18) returns a batch sending request command response (10-19). Thereafter, the data requested to be transmitted is sent together (10-20). The management server that has received the data stores the data in the DB (10-21). When the batch sending data is completed, a server-led batch sending end notification (10-22) is transmitted.

  As described above, the notification of the sensing sequence number range is performed each time one batch sending is completed, so that it is possible to notify the management server that the node batch sending sequence has been completed. Furthermore, each time the sensing sequence number range notification is performed, the remaining retry count is decreased by one, and when the remaining retry count reaches 0, the node-led batch sending is terminated, thereby communicating between the other sensor nodes and the management server. The influence on can be eliminated.

  FIG. 11 is a sequence diagram in the case where the data loss of the collective feed according to the present embodiment is complemented normally. When the node is inserted into the cradle (11-1), the node wirelessly transmits a cradle connection flag (11-2). This data is stored in the DB (11-3).

  After wirelessly transmitting the cradle connection flag (11-2), the node performs node-led batch sending (11-4). This data is stored in the DB (11-5).

  The node that has finished the node-led batch sending (11-4) wirelessly transmits a sensing sequence number range notification (11-6). The management server that has received this searches the DB for data loss of the sensing data of the sensing sequence number within the range specified in the sensing sequence number range notification (11-7). As a result of the search, a sensing sequence number of data that has been lost is recorded, and a collective sending request command (11-8) including a pair of sensing sequence numbers at the beginning and end of missing is created for continuous data loss.

  The base station that has received the batch sending request command (11-8) converts the batch sending request command (11-8) into a batch sending request command (11-9) in a wireless format and transmits it to the sensor node.

  The node that has received the batch sending request command (11-9) returns a batch sending request command response (11-10) to the base station. Further, at this time, the node performs batch sending (11-11) from the data with the oldest sensing time for each sensing data type shown in FIG. This summary feed data is stored in the DB (11-12).

  Once this collective sending ends, the node wirelessly transmits a sensing sequence number range notification (11-13), and decreases the remaining retry count by one. The management server that received this checks again for data loss in the DB (11-14).

  Even if the number of remaining retries is not 0, if there is no data loss in this data loss check, the server issues a server-initiated batch sending end notification (11-15) to the node. The node that has received the server-initiated batch sending end notification (11-15) shifts from the batch sending mode to the sleep mode.

  As described above, even if the remaining retry count is 2 or more, if the data is not found by searching the DB, by sending a server-led batch sending completion notification from the management server to the node, The batch sending sequence can be completed with.

  FIG. 12 is a sequence diagram at the time of node timeout for batch sending in the present embodiment. When the node is inserted into the cradle (12-1), the node wirelessly transmits a cradle connection flag (12-2). This data is stored in the DB (12-3).

  After wirelessly transmitting the cradle connection flag (12-2), the node performs node-led batch sending (12-4). This data is stored in the DB (12-5).

  The node that has finished the node-led batch transmission (12-4) wirelessly transmits a sensing sequence number range notification (12-6). The management server that has received this searches the DB for data loss of the sensing data of the sensing sequence number within the range specified in the sensing sequence number range notification (12-7). As a result of the search, a sensing sequence number of data that has been lost is recorded, and a collective sending request command (12-8) including a pair of sensing sequence numbers at the beginning and end of missing is created for continuous data loss.

  The base station that has received the batch sending request command (12-8) converts the batch sending request command (12-8) into a batch sending request command (12-9) in a wireless format.

  However, if a delay occurs in the base station at this time, and the node does not receive the batch transmission request command (12-9) even after a predetermined time has elapsed, it is determined that a timeout has occurred, and the number of remaining retries is decreased by one. Transmits a sensing sequence number range notification event (12-10).

  Thus, by providing a timeout for the node, it is possible to avoid a state in which the node continues to wait for a response from the management server or the base station. As a result, even when the batch transmission request from the base station to the sensor node is delayed, the data loss complementing process can be performed quickly and reliably.

  FIG. 13 is a sequence diagram at the time of batch management server timeout in the present embodiment. When the node is inserted into the cradle (13-1), the node wirelessly transmits a cradle connection flag (13-2). This data is stored in the DB (13-3).

  After wirelessly transmitting the cradle connection flag (13-2), the node performs node-led batch sending (13-4). This data is stored in the DB (13-5).

  The node that has finished the node-led batch transmission (13-4) wirelessly transmits a sensing sequence number range notification (13-6). The management server that has received this searches the DB for data loss of the sensing data of the sensing sequence number within the range specified in the sensing sequence number range notification (13-7). As a result of the search, a sensing sequence number of data that has been lost is recorded, and a collective sending request command (13-8) including a pair of sensing sequence numbers at the beginning and end of missing is created for continuous data loss.

  The base station that has received the batch sending request command (13-8) converts the batch sending request command (13-8) into a batch sending request command (13-9) in a wireless format and transmits it to the sensor node.

  The node that has received the batch sending request command (13-10) returns a batch sending request command response (13-10) to the base station and transmits the batch sending data (13-11).

  However, if a delay occurs in the base station at this time and the management server does not receive the server-initiated batch sending data (13-11) (13-12) even after a predetermined time has elapsed, it is determined that a timeout has occurred and the The number of retries is decreased by 1, and the management server transmits a batch transmission request command (13-13).

  Thus, by providing a timeout in the management server, it is possible to avoid a state in which the management server continues to wait for a response from the node or base station. Thereby, even if transmission of the collective sending data from the base station to the management server is delayed, the data loss complementing process can be performed quickly and reliably.

  FIG. 14 is an example of a sensing sequence number range notification format transmitted from the sensor node to the management server. Application Header represents the type of application. Data Type represents the type of data. Message Type represents whether the data is observation data or a command. Sequence Num represents a sequence number. When an abnormality occurs, an abnormality flag, reserve, and batch sending remaining retry count that are data indicating the abnormality are stored.

  In this way, by transmitting the oldest sensing sequence number and the latest sensing sequence number, the management server can limit the range for searching for data loss.

  FIG. 15 is an example of a server-initiated batch sending request format transmitted from the management server to the sensor node. Application Header represents the type of application. Data Type represents the type of data. Message Type indicates whether the data is observation data or a command. Sequence Num represents a sequence number.

  The sensing data type represents the type of sensing data for which batch sending is requested. The number of remaining batch sending retries indicates how many batch feeds are executed after the remaining number of retries. The number of divided frames represents the number of divided frames when the server-initiated batch sending request is divided and transmitted as a radio frame. The total number of divided frames represents the total number of divided frames. The number of sets of sensing sequence numbers represents the number of sets of the start sensing sequence number, end, and sensing sequence number. The start sensing sequence number represents the start value of the continuous sensing sequence number in the missing data. The end sensing sequence number (15-12) represents the end value of the continuous sensing sequence number in the missing data.

  As described above, by including a set of the start sensing sequence number, the end, and the sensing sequence number in the wireless format, it is possible to designate missing data.

  FIG. 16 is an example of a server-initiated batch sending end notification format transmitted from the management server to the sensor node or from the sensor node to the management server. Application Header represents the type of application. Data Type represents the type of data. Message Type indicates whether the data is observation data or a command. Sequence Num represents a sequence number.

  In this way, by adding the sequence number to the server-initiated batch sending end notification format, it is possible to know at which timing the server-led batch sending end notification has been issued.

  FIG. 17 shows the control of batch sending from the base station to the node. When the collective transmission data (17-GRF) from a plurality of nodes is concentrated on the base station, the load is particularly high. This load is reduced by limiting the number of nodes that perform simultaneous sending from the base station.

  Specifically, when the base station host (17-HGW1) manages the number of nodes simultaneously sent together and receives batch sending data from a certain number of nodes or more, it sends a batch sending pause command (17 -Stop) is issued, and the node (17-SN3) receiving this stops operation for a certain period of time. By this operation, it becomes possible to limit the number of nodes that perform simultaneous sending in one base station, and the load on the base station can be reduced. Furthermore, the load on the management server can be suppressed to a certain level or less by this collective feed control.

  In this way, by limiting the number of nodes that allow simultaneous sending simultaneously in one base station, the load on the base station and the management server can be reduced.

  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.

An example of an explanatory diagram showing the flow of processing in a business microscope system Example of block diagram in business microscope system Example of block diagram in business microscope system Example of configuration diagram of name tag type sensor node Example of business microscope system configuration diagram Example of a diagram showing the wireless format of the sensor node An example of data flow diagram of batch sending in business microscope system Example of explanatory diagram of distribution tendency of data loss Example of state transition diagram of sensor node in batch sending Example of server state transition diagram in batch sending Example of normal communication sequence for batch sending An example of communication sequence for data supplement in batch sending Example of communication sequence when sensor node times out in batch sending An example of a communication sequence at server timeout in batch sending An example of sensing sequence number range notification format in batch sending An example of server-driven batch sending request format in batch sending An example of server-led batch sending end notification format in batch sending An example of control from a base station to a node in batch sending

Explanation of symbols

  NN ... Business card type sensor node, PDET ... External power supply connection detection unit, TRCC ... Wireless communication control unit, TRSR ... Transmission / reception unit, PDETS ... External power supply detection signal, GW ... Base station, TS ... NTP server, SS ... Sensor network server, AS ... application server, CL ... client, HGW ... base station host, RFGW ... base station radio unit, SN ... sensor node, CR ... cradle, DB ... database, GRF ... batch sending.

Claims (14)

A terminal having a sensor that acquires sensing data, a recording unit that records the sensing data as a backup, and a wireless communication unit that wirelessly transmits the sensing data to a base station;
A base station that performs wireless communication with the terminal, has a transmission / reception unit that receives and transmits the sensing data to a server,
A server having a transmission / reception device that receives sensing data from the base station, and a control unit that manages the sensing data;
A recording device for recording sensing data managed by the control unit, and when the wireless communication environment between the terminal and the base station is in a good state, the wireless communication unit of the terminal is recorded as the backup The sensing data is collectively transmitted to the base station, and then the control unit of the server searches for a lack of sensing data recorded in the recording device, and sends a command to the terminal to retransmit the sensing data with the defect. Data management system issued to terminals. The data management system according to claim 1,
A data management system in which the wireless communication unit transmits the defective sensing data to the base station based on the command. The data management system according to claim 1,
When the transmitter / receiver receives the sensing data, the transmitter / receiver transmits a signal indicating that the sensing data has been received to the terminal,
When the terminal does not receive the signal within a predetermined time, the terminal has a sensor data storage control unit that records the recording data in the recording unit with a transmission failure flag attached thereto,
The wireless communication unit wirelessly transmits sensing data to which the transmission failure flag is attached, among sensing data recorded as the backup, to the base station. The data management system according to claim 1,
A data management system in which the terminal detects that a wireless communication environment between the terminal and the base station is in a good state by connecting to a charger. The data management system according to claim 1,
When the amount of sensing data to be wirelessly transmitted exceeds a predetermined value, the wireless communication unit of the terminal divides the sensing data and transmits it as a divided frame,
The base station or the server is a data management system for combining the divided frames. The data management system according to claim 1,
The data management system, wherein the terminal includes a sensor data storage control unit that records a time when the sensing data is acquired in association with the sensing data. The data management system according to claim 6,
The data management system in which the sensor data storage control unit deletes the sensing data from the oldest time when the data storage area of the recording unit runs out. The data management system according to claim 1,
The terminal repeats the activation state and the sleep state in a predetermined cycle, and assigns the same sensing sequence number to each of the plurality of sensing data acquired in the same activation state, while giving different sequence numbers Management system. The data management system according to claim 8, wherein
The wireless communication unit of the terminal collectively transmits the sensing data recorded as the backup to the base station and then transmits the latest sensing sequence number and the oldest sensing sequence number recorded in the recording unit. Is a data management system for transmitting to the base station. The data management system according to claim 1,
The base station is a data management system including a control unit that issues a transmission stop command to a terminal that transmits the sensing data when the number of terminals that collectively transmit the sensing data is a predetermined number or more. A sensor that acquires sensing data, a recording unit that records the sensing data as a backup, a wireless communication unit that wirelessly transmits the sensing data to a base station, an external power supply connection detection unit that detects connection with a charger, A terminal having
A base station that performs wireless communication with the terminal, has a transmission / reception unit that receives and transmits the sensing data to a server,
A server having a transmission / reception device that receives sensing data from the base station, and a control unit that manages the sensing data;
A recording device that records sensing data managed by the control unit, and the wireless communication unit of the terminal records as the backup triggered by the external power connection detection unit detecting a connection with the charger. Of the detected sensing data is transmitted wirelessly to the base station, and then the control unit of the server searches for the missing sensing data recorded in the recording device, and detects the sensing data with the missing data. A data management system that issues a command to the terminal to retransmit the terminal to the terminal, and the wireless communication unit transmits sensing data designated by the command to the base station. A data management system according to claim 11, comprising:
When the transmitter / receiver receives the sensing data, the transmitter / receiver transmits a signal indicating that the sensing data has been received to the terminal,
When the terminal does not receive the signal within a predetermined time, the terminal has a sensor data storage control unit that records the recording data in the recording unit with a transmission failure flag attached thereto,
The wireless communication unit wirelessly transmits sensing data to which the transmission failure flag is attached, among sensing data recorded as the backup, to the base station. A data management system according to claim 11, comprising:
The terminal repeats the activation state and the sleep state at a predetermined cycle, and assigns the same sensing sequence number to each of the plurality of sensing data acquired in the same activation state, while assigning different sequence numbers,
The wireless communication unit collectively transmits the sensing data recorded as the backup to the base station, and then sets the latest sensing sequence number and the oldest sensing sequence number recorded in the recording unit. A data management system that transmits data to a base station. The data management system according to claim 13,
The terminal does not receive a response from the base station within a predetermined time after transmitting the latest sensing sequence number and the oldest sensing sequence number to the base station, and the remaining number of retries is 1 or more. In the case of the data management system, the latest sensing sequence number and the oldest sensing sequence number are retransmitted, and when the remaining number of retries is 0, the data management system transits from the activated state to the sleeping state.

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