Method and apparatus for network management using periodic measurements of indicators

• US 8,265,051 B2
• Filed: 04/20/2010
• Issued: 09/11/2012
• Est. Priority Date: 05/14/2003
• Status: Active Grant

• Current Assignee: Intel Corporation
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Kwak, Joseph A.
• Primary Examiner(s): Tran, Phuc
• Application Number:
  US12/763,360
• Publication Number:
  US 20100202315A1
• Time in Patent Office: 875 Days
• Field of Search: 370328-344, 370431-444, 370/430, 370/312
• US Class Current: 370/338
• CPC Class Codes: H04W 24/08 Testing, supervising or monitoring using real traffic
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 48/14 using user query or user detection
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

Abstract

A beacon signal used in data communications, such as the IEEE 802.11, is provided with data extensions. The data extensions permit additional information to be provided by the beacon signal, thereby reducing the traffic overhead of the network. The data extensions further permit handoffs and handoffs based on offset values. Periodic beacon requests are made during connection between a wireless transmit/receive unit (WTRU) and an access point (AP) on a WLAN. A Measurement Request field corresponding to a beacon request contains a measurement duration value and channel number for which the request applies. The beacon request permits a scan mode which includes “Active Scan” mode, “Passive Scan” mode and “Beacon Table” mode. In Active Scan mode, the measuring station (STA) transmits a probe request with a broadcast SSID. In Passive Scan mode, the measuring STA passively receives on the specified channel and return a beacon report containing one information element for each STA from which it detects a beacon or probe response. In Beacon Table mode, the measuring STA returns a beacon report containing the current contents of its beacon table without performing additional measurements.

Claims

1. A method for use in a wireless transmit/receive unit (WTRU), the method comprising:

receiving, from an access point (AP), a request to provide a beacon report, wherein the request comprises a mode field, a measurement duration field, a Basic Service Set Identifier (BSSID) field, a channel number field, and a reporting condition element representing a transmission condition for transmitting a beacon report; and

transmitting, to the AP, the beacon report in response to satisfaction of the transmission condition.

2. The method of claim 1 wherein the reporting condition element is an 8 bit integer.

3. The method of claim 1, wherein the reporting condition element has a value of 0, and wherein the method further comprises:

periodically performing a measurement; and

transmitting the beacon report based on each periodically performed measurement.

4. The method of claim 1 wherein the reporting condition element has a value of 1, and wherein the method further comprises:

transmitting the beacon report in response to a measured received channel power indicator (RCPI) value that is above a threshold.

5. The method of claim 1 wherein the reporting condition element has a value of 2, and wherein the method further comprises:

transmitting the beacon report in response to a measured received channel power indicator (RCPI) value that is below a threshold.

6. The method of claim 1 wherein the reporting condition element has a value of 3, and wherein the method further comprises:

transmitting the beacon report in response to a measured signal to noise indicator (SNI) value that is greater than a threshold.

7. The method of claim 1 wherein the reporting condition element has a value of 4, and wherein the method further comprises:

transmitting the beacon report in response to a measured signal to noise indicator (SNI) value that is below an absolute threshold with hysteresis.

8. The method of claim 1 wherein the reporting condition element has a value of 5, and wherein the method further comprises:

transmitting the beacon report in response to a measured received channel power indicator (RCPI) value that is above a threshold defined by an offset from a RCPI value of a serving access point (AP).

9. The method of claim 1 wherein the reporting condition element has a value of 6, and wherein the method further comprises:

transmitting the beacon report in response to a measured received channel power indicator (RCPI) value that is below a threshold defined by an offset from an RCPI value of a serving access point (AP).

10. The method of claim 1 wherein the reporting condition element has a value of 7, and wherein the method further comprises:

transmitting the beacon report in response to a measured signal to noise indicator (SNI) value that is above a threshold defined by an offset from an SNI value of a serving access point (AP).

11. The method of claim 1 wherein the reporting condition element has a value of 8, and wherein the method further comprises:

transmitting the beacon report in response to a measured signal to noise indicator (SNI) value that is below a threshold defined by an offset from an SNI value of a serving access point (AP).

12. The method of claim 1 wherein the reporting condition element has a value of 9, and wherein the method further comprises:

transmitting the beacon report periodically in response to a measured received channel power indicator (RCPI) value that is in a range bound by a RCPI value of a serving access point (AP) and an offset reference value.

13. The method of claim 1 wherein the reporting condition element has a value of 10, and wherein the method further comprises:

transmitting the beacon report periodically in response to a measured signal to noise indicator (SNI) value that is in a range bound by a SNI value of a serving access point (AP) and an offset reference value.

14. The method of claim 1, wherein the mode field indicates a passive scan mode, an active scan mode, or a beacon table mode.

15. A wireless transmit/receive unit (WTRU) comprising:

a receiver configured to receive, from an access point (AP), a request to provide a beacon report, wherein the request comprises a mode field, a measurement duration field, a Basic Service Set Identifier (BSSID) field, a channel number field, and a reporting condition element that represents a transmission condition for transmitting a beacon report; and

a transmitter configured to transmit the beacon report to the AP in response to satisfaction of the transmission condition.

16. The WTRU of claim 15 wherein the reporting condition element is an 8 bit integer.

17. The WTRU of claim 15 further comprising:

a measurement unit configured to perform a measurement, wherein the reporting condition element is 0 and the transmitter is further configured to transmit the beacon report based on each measurement.

18. The WTRU of claim 15 wherein the reporting condition element has a value of 1 and the transmitter is further configured to transmit the beacon report in response to a measured received channel power indicator (RCPI) value that is above a threshold.

19. The WTRU of claim 15 wherein the reporting condition element has a value of 2 and the transmitter is further configured to transmit the beacon report in response to a measured received channel power indicator (RCPI) value that is below a threshold.

20. The WTRU of claim 15 wherein the reporting condition element has a value of 3 and the transmitter is further configured to transmit the beacon report on a condition that a measured signal to noise indicator (SNI) value is greater than a threshold.

21. The WTRU of claim 15 wherein the reporting condition element has a value of 4 the transmitter is further configured to transmit and the beacon report in response to a measured signal to noise indicator (SNI) value that is below an absolute threshold with hysteresis.

22. The WTRU of claim 15 wherein the reporting condition element has a value of 5 the transmitter is further configured to transmit and the beacon report in response to a measured received channel power indicator (RCPI) value that is above a threshold defined by an offset from a RCPI value of a serving access point (AP).

23. The WTRU of claim 15 wherein the reporting condition element has a value of 6 and the transmitter is further configured to transmit and the beacon report in response to a measured received channel power indicator (RCPI) value that is below a threshold defined by an offset from an RCPI value of the a serving access point (AP).

24. The WTRU of claim 15 wherein the reporting condition element has a value of 7 and the transmitter is further configured to transmit the beacon report in response to a measured signal to noise indicator (SNI) value that is above a threshold defined by an offset from an SNI value of the a serving access point (AP).

25. The WTRU of claim 15 wherein the reporting condition element has a value of 8 and the transmitter is further configured to transmit the beacon report in response to a measured signal to noise indicator (SNI) value that is below a threshold defined by an offset from an SNI value of the a serving access point (AP).

26. The WTRU of claim 15 wherein the reporting condition element has a value of 9 and the transmitter is further configured to transmit the beacon report periodically in response to a measured received channel power indicator (RCPI) value that is in a range bound by a RCPI value of a serving access point (AP) and an offset reference value.

27. The WTRU of claim 15 wherein the reporting condition element has a value of 10 and the transmitter is further configured to transmit the beacon report-periodically in response to a measured signal to noise indicator (SNI) value that is in a range bound by a SNI value of a serving access point (AP) and a offset reference value.

28. The WTRU of claim 15, wherein the receiver is further configured to receive the mode field indicating a passive scan mode, an active scan mode, or a beacon table mode.

29. A method for use in an access point (AP), the method comprising:

transmitting, to a wireless transmit/receive unit (WTRU), a request to provide a beacon report, wherein the request comprises a mode field, a measurement duration field, a Basic Service Set Identifier (BSSID) field, a channel number field, and a reporting condition element representing a transmission condition for transmitting a beacon report; and

receiving, from the WTRU, the beacon report in response to satisfaction of the transmission condition.

30. The method of claim 29, wherein the mode field indicates a passive scan mode, an active scan mode, or a beacon table mode.

31. The method of claim 29 wherein the reporting condition element is an 8 bit integer.

32. The method of claim 29, wherein the reporting condition element has a value of 0, and wherein the method further comprises:

receiving the beacon report based on a periodically performed measurement.

33. The method of claim 29 wherein the reporting condition element has a value of 1, and wherein the method further comprises:

receiving the beacon report in response to a measured received channel power indicator (RCPI) value that is above a threshold.

34. The method of claim 29 wherein the reporting condition element has a value of 2, and wherein the method further comprises:

receiving the beacon report in response to a measured received channel power indicator (RCPI) value that is below a threshold.

35. The method of claim 29 wherein the reporting condition element has a value of 3, and wherein the method further comprises:

receiving the beacon report in response to a measured signal to noise indicator (SNI) value that is greater than a threshold.

36. The method of claim 29 wherein the reporting condition element has a value of 4, and wherein the method further comprises:

receiving the beacon report in response to a measured signal to noise indicator (SNI) value that is below an absolute threshold with hysteresis.

37. The method of claim 29 wherein the reporting condition element has a value of 5, and wherein the method further comprises:

receiving the beacon report in response to a measured received channel power indicator (RCPI) value that is above a threshold defined by an offset from a RCPI value of a serving AP.

38. The method of claim 29 wherein the reporting condition element has a value of 6, and wherein the method further comprises:

receiving the beacon report in response to a measured received channel power indicator (RCPI) value that is below a threshold defined by an offset from an RCPI value of a serving AP.

39. The method of claim 29 wherein the reporting condition element has a value of 7, and wherein the method further comprises:

receiving the beacon report in response to a measured signal to noise indicator (SNI) value that is above a threshold defined by an offset from an SNI value of a serving AP.

40. The method of claim 29 wherein the reporting condition element has a value of 8, and wherein the method further comprises:

receiving the beacon report in response to a measured signal to noise indicator (SNI) value that is below a threshold defined by an offset from an SNI value of a serving AP.

41. The method of claim 29 wherein the reporting condition element has a value of 9, and wherein the method further comprises:

receiving the beacon report periodically in response to a measured received channel power indicator (RCPI) value that is in a range bound by an RCPI value of a serving AP and an offset reference value.

42. The method of claim 29 wherein the reporting condition element has a value of 10, and wherein the method further comprises:

receiving the beacon report periodically in response to a measured signal to noise indicator (SNI) value that is in a range bound by a SNI value of a serving AP and an offset reference value.

43. An access point (AP) comprising:

a transmitter configured to transmit, to a wireless transmit/receive unit (WTRU), a request to provide a beacon report, wherein the request comprises a mode field, a measurement duration field, a Basic Service Set Identifier (BSSID) field, a channel number field, and a reporting condition element that represents a transmission condition for transmitting a beacon report; and

a receiver configured to receive, from the WTRU, the beacon report in response to satisfaction of the transmission condition.

44. The AP of claim 43, wherein the transmitter is further configured to transmit the mode field indicating a passive scan mode, an active scan mode, or a beacon table mode.

45. The AP of claim 43 wherein the reporting condition element is an 8 bit integer.

46. The AP of claim 43, wherein the reporting condition element is 0 and the receiver is further configured to receive the beacon report based on a measurement.

47. The AP of claim 43 wherein the reporting condition element has a value of 1 and the receiver is further configured to receive the beacon report in response to a measured received channel power indicator (RCPI) value that is above a threshold.

48. The AP of claim 43 wherein the reporting condition element has a value of 2 and the receiver is further configured to receive the beacon report in response to a measured received channel power indicator (RCPI) value that is below a threshold.

49. The AP of claim 43 wherein the reporting condition element has a value of 3 and the receiver is further configured to receive the beacon report on a condition that a measured signal to noise indicator (SNI) value is greater than a threshold.

50. The AP of claim 43 wherein the reporting condition element has a value of 4 the receiver is further configured to receive and the beacon report in response to a measured signal to noise indicator (SNI) value that is below an absolute threshold with hysteresis.

51. The AP of claim 43 wherein the reporting condition element has a value of 5 the receiver is further configured to receive and the beacon report in response to a measured received channel power indicator (RCPI) value that is above a threshold defined by an offset from a RCPI value of a serving AP.

52. The AP of claim 43 wherein the reporting condition element has a value of 6 and the receiver is further configured to receive the beacon report in response to a measured received channel power indicator (RCPI) value that is below a threshold defined by an offset from an RCPI value of the a serving AP.

53. The AP of claim 43 wherein the reporting condition element has a value of 7 and the receiver is further configured to receive the beacon report in response to a measured signal to noise indicator (SNI) value that is above a threshold defined by an offset from an SNI value of the a serving AP.

54. The AP of claim 43 wherein the reporting condition element has a value of 8 and the receiver is further configured to receive the beacon report in response to a measured signal to noise indicator (SNI) value that is below a threshold defined by an offset from an SNI value of the a serving AP.

55. The AP of claim 43 wherein the reporting condition element has a value of 9 and the receiver is further configured to receive the beacon report periodically in response to a measured received channel power indicator (RCPI) value that is in a range bound by a RCPI value of a serving AP and an offset reference value.

56. The AP of claim 45 wherein the reporting condition element has a value of 9 and the receiver is further configured to receive the beacon report periodically in response to a measured received channel power indicator (RCPI) value that is in a range bound by a RCPI value of a serving AP and an offset reference value.

57. A wireless communications system comprising:

a first station (STA) configured to transmit a request to provide a beacon report, wherein the request comprises a mode field, a measurement duration field, a Basic Service Set Identifier (BSSID) field, a channel number field, and a reporting condition element that represents a transmission condition for transmitting a beacon report; and

a second STA configured to receive the request, wherein on a condition that the second STA does not recognize the reporting condition element, the second STA is further configured to transmit the beacon report to the first STA in response to performing a measurement.

58. The wireless communications system of claim 57, wherein the first STA is an access point (AP).