BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a partial cutaway view showing the front of a wrist-band type sensor node and antenna describing a first embodiment of the invention, where the sensor node is fitted to the left wrist;
FIG. 2 is a diagram describing the arrangement of a pulse sensor when the bottom surface of a case is viewed from the top surface;
FIG. 3 is a block diagram showing an example of a health management sensor network system implemented by the wrist-band type sensor node of the invention;
FIG. 4 shows an example of the format of data which is sent/received between a sensor node and a base station BS10. (a) shows time setting command data, (b) shows time setting end data, (c) shows transmission data, and (d) shows association request data;
FIG. 5 is a flow chart showing an example of a control program executed by the sensor node, and a control program executed by the base station;
FIG. 6 is a block diagram showing the construction of a nonvolatile memory EEPROM;
FIG. 7 is a block diagram showing the construction of a main memory RAM;
FIG. 8 is a flow chart showing a subroutine of delayed transmission data storage processing performed in P147 of FIG. 5;
FIG. 9 is a flow chart showing a subroutine of a battery remaining amount check processing performed in P1501 of FIG. 8;
FIG. 10 is a graph showing a voltage of a battery BAT and an elapsed time, showing the relation between an EEPROM data transfer voltage setting value and a node operation limit;
FIG. 11 is a flow chart showing a subroutine of an EEPROM write processing performed in P1507 of FIG. 8;
FIG. 12 is a graph showing the relation between a delayed transmission data storage size and time, and showing the conditions for changing over a storage location between a ring buffer RNG1 of the main memory RAM and the EEPROM;
FIG. 13 is a flow chart showing a subroutine for an untransmitted data determination performed in P145 of FIG. 5.
FIG. 14 is a flow chart showing a subroutine for an untransmitted data read processing performed in P148 of FIG. 5;
FIG. 15 is a flow chart showing a subroutine for a RAM read processing performed in P1803 of FIG. 14;
FIG. 16 is a flow chart showing a subroutine for an initialization performed in P135 of FIG. 5;
FIG. 17 is a descriptive diagram showing a time data format of a sensor node;
FIG. 18 is a graph showing the relation between a power consumption of a sensor node and time when transmit/receive is performed normally;
FIG. 19 is a graph showing the relation between a power consumption of a sensor node and time during transmit/receive, when a reply signal ACK could not be received from the base station BS10;
FIG. 20 is a graph showing the relation between a power consumption of a sensor node and time when transmit/receive is performed normally, and sensing data was accumulated on the immediately preceding startup;
FIG. 21 is a graph showing the relation between a reception sensitivity and time in a base station according to the positional relation between the sensor node and the base station;
FIG. 22 is a plan view of a residence provided with a sensor network;
FIG. 23 is a plan view of another residence provided with a sensor network;
FIG. 24 is a descriptive diagram showing a sensor node fitting position, and a person's orientation;
FIG. 25 is a graph showing a transmission intensity of a sensor node according to a person's orientation; and
FIG. 26 is a block diagram of an example of a sensor network system showing a second embodiment of the invention.
Patent Application
20070159321
