Radio frequency identification devices, remote communication devices, wireless communication systems, and methods of indicating operation

• US 6,459,376 B2
• Filed: 07/29/1999
• Issued: 10/01/2002
• Est. Priority Date: 07/29/1999
• Status: Expired due to Term

• Current Assignee: Round Rock Research LLC
• Original Assignee: Micron Technology, Inc.
• Inventors: Trosper, Scott T.
• Primary Examiner(s): Wu, Daniel J.
• Assistant Examiner(s): PHAM, TOAN NGOC
• Application Number:
  US09/363,945
• Publication Number:
  US 20010048363A1
• Time in Patent Office: 1,160 Days
• Field of Search: 340/571, 340/572.1, 340/10.1, 340/10.2, 340/572.4, 340/572.8, 340/573.1, 340/539, 340/825.36, 340/825.44, 340/5.81, 340/10.4, 340/10.42, 340/825.72, 340/825.45, 340/10.51
• US Class Current: 340/571
• CPC Class Codes: G06K 19/0723 the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs
• CPC Class Codes: G08B 13/1427 with transmitter-receiver for distance detection
• CPC Class Codes: G08B 21/0227 System arrangements with a plurality of child units
• CPC Class Codes: G08B 21/023 Power management, e.g. system sleep and wake up provisions

Abstract

The present invention provides radio frequency identification devices, remote communication devices, wireless communication systems, and methods of indicating operation. According to a first aspect, a radio frequency identification device includes a substrate; communication circuitry coupled with the substrate and configured to receive wireless signals including spurious signals; and indication circuitry coupled with the communication circuitry and configured to output an indication signal to indicate reception of the spurious signals within the communication circuitry. Another aspect provides a method of indicating operation of a radio frequency identification device including providing a radio frequency identification device including communication circuitry and indication circuitry; receiving wireless signals including spurious signals using the communication circuitry; and emitting human perceptible signals using the indication circuitry to indicate the receiving spurious signals.

Claims

1. A radio frequency identification device comprising:

a substrate;

communication circuitry coupled with the substrate and configured to receive wireless signals including spurious signals; and

indication circuitry coupled with the communication circuitry and configured to output an indication signal to indicate reception of the spurious signals within the communication circuitry.

2. The radio frequency identification device according to claim 1 wherein the indication circuitry is configured to emit a human perceptible signal to indicate the reception.

3. The radio frequency identification device according to claim 1 wherein the indication circuitry includes a light emitting device configured to emit a human visible signal to indicate the reception.

4. The radio frequency identification device according to claim 1 wherein the communication circuitry is configured to periodically monitor for the reception of wireless signals.

5. The radio frequency identification device according to claim 1 wherein the control circuitry comprises a latch.

6. The radio frequency identification device according to claim 1 wherein the communication circuitry is configured to search for a pseudo-random sequence of individual received wireless signals.

7. A remote communication device comprising:

a substrate;

communication circuitry coupled with the substrate and configured to receive a wireless signal, to process the wireless signal, and to assert a first signal during the processing of the wireless signal;

control circuitry coupled with the communication circuitry and configured to monitor the first signal, and to selectively generate a second signal responsive to the first signal being asserted for a predetermined period of time; and

indication circuitry coupled with the control circuitry and configured to indicate reception of the wireless signal responsive to the second signal.

8. The remote communication device according to claim 7 wherein the indication circuitry is configured to emit a human perceptible signal to indicate the reception.

9. The remote communication device according to claim 7 wherein the communication circuitry is configured to periodically monitor for the reception of a wireless signal.

10. The remote communication device according to claim 7 wherein the indication circuitry is configured to indicate the reception of the wireless signal including a spurious signal.

11. The remote communication device according to claim 7 wherein the control circuitry comprises a filter configured to selectively remove the first signal if it is asserted for less than the predetermined period of time.

12. The remote communication device according to claim 7 wherein the communication circuitry comprises radio frequency identification device circuitry.

13. The remote communication device according to claim 7 wherein the control circuitry comprises a latch.

14. A radio frequency identification device comprising:

a substrate;

communication circuitry coupled with the substrate and configured to receive wireless signals including spurious signals, to process at least some of the received wireless signals, and to assert signals responsive to the processing of the wireless signals received within the communication circuitry; and

indication circuitry coupled with the communication circuitry and configured to emit human perceptible signals indicating reception of the spurious signals responsive to the assertion of the signals by the communication circuitry.

15. The radio frequency identification device according to claim 14 wherein the indication circuitry is configured to emit human visible signals to indicate the reception.

16. The radio frequency identification device according to claim 14 wherein the communication circuitry is configured to periodically monitor for the reception of wireless signals.

17. The radio frequency identification device according to claim 14 further comprising control circuitry configured to control the outputting of the human perceptible signals responsive to the signals from the communication circuitry being asserted for a predetermined period of time.

18. A wireless communication system comprising:

an interrogator configured to output a forward link wireless signal; and

a radio frequency identification device including;

communication circuitry configured to receive the forward link wireless signal and a spurious wireless signal; and

indication circuitry coupled with the communication circuitry and configured to indicate reception of the spurious wireless signal within the communication circuitry.

19. The wireless communication system according to claim 18 wherein the indication circuitry is configured to emit a human perceptible signal to indicate the reception.

20. The wireless communication system according to claim 18 wherein the indication circuitry includes a light emitting device configured to emit a human visible signal to indicate the reception.

21. A method of indicating operation of a radio frequency identification device comprising:

providing a radio frequency identification device including communication circuitry and indication circuitry;

receiving wireless signals including spurious signals using the communication circuitry; and

emitting human perceptible signals using the indication circuitry to indicate the receiving spurious signals.

22. The method according to claim 21 wherein the emitting includes emitting human visible signals.

23. The method according to claim 21 further comprising processing the wireless signals using the communication circuitry and the emitting is responsive to the processing.

24. The method according to claim 23 wherein the processing comprises searching for pseudo-random sequences of the wireless signals.

25. A method of indicating operation of a radio frequency identification device comprising:

providing a radio frequency identification device;

receiving wireless signals including spurious signals within the radio frequency identification device;

processing the wireless signals after the receiving using the radio frequency identification device; and

indicating the receiving of spurious signals using the radio frequency identification device.

26. The method according to claim 25 wherein the indicating includes emitting a human perceptible signal.

27. The method according to claim 25 wherein the indicating includes emitting a human visible signal.

28. The method according to claim 25 wherein the indicating is responsive to the processing occurring for a predetermined period of time.

29. The method according to claim 25 wherein the processing comprises searching for pseudo-random sequences of the wireless signals.

30. A method of indicating operation of a remote communication device comprising:

providing a remote communication device;

receiving a wireless signal within the remote communication device;

processing the wireless signal after the receiving using the remote communication device;

asserting a signal during the processing using the remote communication device; and

indicating the receiving using the remote communication device responsive to the asserting occurring for a predetermined period of time.

31. The method according to claim 30 wherein the indicating includes emitting a human perceptible signal.

32. The method according to claim 30 wherein the indicating includes emitting a human visible signal.

33. The method according to claim 30 further comprising periodically asserting the signal.

34. The method according to claim 30 further comprising filtering the asserted signal.

35. The method according to claim 30 wherein the receiving includes receiving the wireless signal including a spurious signal and the indicating includes indicating the receiving the spurious signal.

36. The method according to claim 30 wherein the providing includes providing a radio frequency identification device.

37. A method of indicating operation of a remote communication device comprising:

providing a remote communication device;

receiving a wireless signal within the remote communication device;

asserting a signal to monitor for the presence of the wireless signal within the remote communication device;

processing the wireless signal using the remote communication device;

maintaining the asserting during the processing; and

indicating the maintaining using the remote communication device.

38. The method according to claim 37 wherein the indicating includes emitting a human perceptible signal.

39. The method according to claim 37 wherein the indicating includes emitting a human visible signal.

40. The method according to claim 37 further comprising periodically asserting the signal.

41. The method according to claim 37 further comprising filtering the asserted signal.

42. The method according to claim 37 wherein the receiving includes receiving the wireless signal including a spurious signal and the indicating includes indicating the receiving the spurious signal.

43. The method according to claim 37 wherein the providing includes providing a radio frequency identification device.

44. A method of indicating operation of a wireless communication system comprising:

providing an interrogator and a radio frequency identification device;

outputting a forward link wireless signal using the interrogator;

receiving the forward link wireless signal within the radio frequency identification device;

receiving spurious wireless signals within the radio frequency identification device; and

indicating the receiving of the spurious wireless signals using the radio frequency identification device.

45. The method according to claim 44 wherein the indicating includes emitting a human perceptible signal.

46. The method according to claim 44 wherein the indicating includes emitting a human visible signal.

47. The method according to claim 44 further comprising processing the forward link wireless signal and the spurious wireless signal and the indicating being responsive to the processing.

48. A method of indicating operation of a wireless communication system comprising:

providing an interrogator and a radio frequency identification device;

outputting a forward link wireless signal using the interrogator;

receiving the forward link wireless signal within the radio frequency identification device;

receiving a spurious wireless signal within the radio frequency identification device;

asserting plural periodic signals to monitor for the presence of the forward link wireless signal within the radio frequency identification device;

processing the received forward link wireless signal and the received spurious wireless signal using the radio frequency identification device after the respective assertings;

maintaining the asserting of an individual one of the periodic signals during the processing;

filtering the asserted signals to remove asserted signals which are asserted for less than a predetermined length of time; and

emitting a human visible signal using the radio frequency identification device indicating the receiving of the spurious wireless signal after the filtering.