Methods and apparatus for automatic dentification wristband

1. An apparatus comprising:

a flexible strap comprising a plurality of holes and a buckle configured to buckle to any one of the plurality of holes, such that, when the buckle is buckled to one of the plurality of holes, the strap forms a closed loop; and

a sensor tag positioned on the flexible strap and comprising a sensor, a memory, at least one processor, and a radio-frequency (RF) antenna, wherein the at least one processor

receives a parameter, representing a characteristic of an environment surrounding the sensor tag, from the sensor,

determines whether or not to report the parameter based on a reporting rule stored in the memory,

when determined to report the parameter, reports the parameter via the RF antenna, and

when not determined to report the parameter, discards the parameter without transmitting the report.

2. The apparatus of claim 1 , wherein the parameter comprises a measure of a pulse of a subject wearing the flexible strap.

3. The apparatus of claim 1 , wherein the parameter comprises a measure of temperature.

4. The apparatus of claim 1 , wherein the parameter comprises a measure of motion.

5. The apparatus of claim 1 , wherein the parameter comprises a measure of vibration.

6. The apparatus of claim 1 , wherein the parameter comprises a measure of a blood glucose level of a subject wearing the flexible strap.

7. The apparatus of claim 1 , wherein the sensor comprises a surface acoustic wave sensor.

8. The apparatus of claim 1 , wherein the reporting rule defines a threshold, and wherein determining whether or not to report the parameter based on the reporting rule comprises comparing a value of the parameter to the defined threshold.

9. An apparatus comprising:

a flexible strap comprising a plurality of holes and a buckle configured to buckle to any one of the plurality of holes, such that, when the buckle is buckled to one of the plurality of holes, the strap forms a closed loop; and

a sensor tag positioned on the flexible strap and comprising a sensor, a memory, at least one processor, and a radio-frequency (RF) antenna,

wherein the at least one processor

receives a parameter, representing a characteristic of an environment surrounding the sensor tag, from the sensor,

determines whether or not to report the parameter based on a reporting rule stored in the memory, and

when determined to report the parameter, reports the parameter via the RF antenna, and

wherein the sensor comprises a surface acoustic wave sensor that comprises a first interdigital transducer, a second interdigital transducer, a piezoelectric substrate between the first interdigital transducer and the second interdigital transducer, and a delay line between the first interdigital transducer and the second interdigital transducer.

10. The apparatus of claim 9 , wherein the delay line comprises a coating which changes in at least one characteristic in response to a change in the environment.

11. The apparatus of claim 10 , wherein the at least one characteristic of the coating comprises one or more of a conductivity, mass, and elasticity of the coating.

12. The apparatus of claim 10 , wherein the first interdigital transducer outputs an electrical signal to the second interdigital transducer via the delay line, and wherein the change in the at least one characteristic of the coating changes a length of the delay line, such that a delay of the electrical signal, output from the first interdigital transducer to the second interdigital transducer, is changed, and wherein the at least one processor detects the change in the delay of the electrical signal.

13. An apparatus comprising:

a flexible strap comprising a plurality of holes and a buckle configured to buckle to any one of the plurality of holes, such that, when the buckle is buckled to one of the plurality of holes, the strap forms a closed loop; and

a sensor tag positioned on the flexible strap and comprising a sensor, a memory, at least one processor, and a radio-frequency (RF) antenna,

wherein the at least one processor

receives a parameter, representing a characteristic of an environment surrounding the sensor tag, from the sensor,

determines whether or not to report the parameter based on a reporting rule stored in the memory, and

when determined to report the parameter, reports the parameter via the RF antenna, and

wherein the sensor tag comprises one or more buckles, wherein each of the one or more buckles is configured to buckle to any one of the plurality of holes in the strap, such that the sensor tag may be attached to the strap at any one of a plurality of positions on the strap.

14. The apparatus of claim 13 , wherein the sensor tag comprises two or more buckles, and wherein each of the two or more buckles on the sensor tag is configured to buckle to any one of the plurality of holes in the strap.

15. An apparatus comprising:

a flexible strap comprising a plurality of holes and a buckle configured to buckle to any one of the plurality of holes, such that, when the buckle is buckled to one of the plurality of holes, the strap forms a closed loop;

a sensor tag positioned on the flexible strap and comprising a sensor, a memory, at least one processor, and a radio-frequency (RF) antenna, wherein the at least one processor

receives a parameter, representing a characteristic of an environment surrounding the sensor tag, from the sensor,

determines whether or not to report the parameter based on a reporting rule stored in the memory, and

when determined to report the parameter, reports the parameter via the RF antenna; and

a power supply that powers the sensor tag,

wherein the strap comprises an electrically-conductive material, such that, when the strap forms a closed loop, the electrically-conductive material forms a completed circuit loop that activates the power supply to provide power to the sensor tag, and, when the strap does not form the closed loop, the electrically-conductive material does not form the completed circuit loop and does not activate the power supply.

16. The apparatus of claim 15 , wherein the buckle is electrically conductive and at least one of the plurality of holes is formed in the electrically-conductive material, such that buckling of the buckle to the at least one hole forms an electrically-conductive contact.

17. The apparatus of claim 15 , wherein the sensor tag is configured to operate in a pure passive mode when not provided power from the power supply, and operate in a battery-assisted passive mode when provided power from the power supply.

18. The apparatus of claim 15 , wherein the power supply comprises a printed battery.

19. An apparatus comprising:

a flexible strap comprising a plurality of holes and a buckle configured to buckle to any one of the plurality of holes, such that, when the buckle is buckled to one of the plurality of holes, the strap forms a closed loop; and

a sensor tag positioned on the flexible strap and comprising a sensor, a memory, at least one processor, and a radio-frequency (RF) antenna,

wherein the at least one processor

receives a parameter, representing a characteristic of an environment surrounding the sensor tag, from the sensor,

determines whether or not to report the parameter based on a reporting rule stored in the memory, and

when determined to report the parameter, reports the parameter via the RF antenna, wherein reporting the parameter via the RF antenna comprises adjusting a signal strength, transmitted by the RF antenna, in proportion to a change in the parameter.