PROXIMITY BASED ACCESS CONTROL

• US 20100279686A1
• Filed: 04/30/2010
• Published: 11/04/2010
• Est. Priority Date: 05/04/2009
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Tokgoz, Yeliz, Nanda, Sanjiv, Patel, Chirag S., Yavuz, Mehmet, Rauber, Peter H.
• Granted Patent: US 8,958,795 B2
• Time in Patent Office: Days
• US Class Current: 455/435.1
• CPC Class Codes: H04W 52/0206 in access points, e.g. base stations access point devices per se H04W88/08
• CPC Class Codes: H04W 52/325 Power control of control or pilot channels
• CPC Class Codes: H04W 60/04 using triggered events
• CPC Class Codes: H04W 64/00 Locating users or terminals or network equipment for network management purposes, e.g. mobility management
• CPC Class Codes: H04W 72/541 using the level of interference
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A method for reducing interference to wireless communication devices is disclosed. A proximity of a wireless communication device to a base station is determined. The proximity of the wireless communication device is compared with a proximity threshold and based on the comparison, access to a femtocell may be granted to a restricted/non-CSG (closed subscriber group) wireless communication device. The method also includes causing a registration response to be sent to the wireless communication device based on the comparison.

Claims

1. A method for reducing interference to wireless communication devices, comprising:

determining a proximity of a wireless communication device to a base station;

comparing the proximity of the wireless communication device with a proximity threshold; and

causing a registration response to be sent to the wireless communication device based on the comparison.

2. The method of claim 1, wherein the method is performed by the base station.

3. The method of claim 2, wherein the base station is a femto access point.

4. The method of claim 1, wherein the proximity of the wireless communication device represents a pathloss from the base station to the wireless communication device, wherein the pathloss is less than the proximity threshold, and wherein causing a registration response to be sent comprises sending a registration response to the wireless communication device.

5. The method of claim 1, wherein the method is performed by a core network.

6. The method of claim 1, further comprising receiving a registration request from the wireless communication device, wherein the wireless communication device is not part of a closed subscriber group (CSG) corresponding to the base station.

7. The method of claim 6, wherein the registration request is part of an access probe.

8. The method of claim 7, wherein the access probe comprises a received downlink pilot channel quality information.

9. The method of claim 8, wherein the proximity is a function of radio frequency (RF) downlink pathloss and is determined using the received downlink pilot channel quality information and a pilot transmit power.

10. The method of claim 1, further comprising broadcasting a beacon.

11. The method of claim 1, wherein the registration response comprises a registration rejection.

12. The method of claim 1, wherein the registration response comprises a registration acceptance.

13. The method of claim 12, further comprising allowing active data/voice communication with the wireless communication device.

14. The method of claim 1, further comprising:

broadcasting a low power beacon during a first cycle, wherein a first time period corresponds to the first cycle;

broadcasting a high power beacon during a second cycle, wherein a second time period corresponds to the second cycle; and

receiving a registration request from a wireless communication device.

15. The method of claim 14, wherein the registration request is received during the first time period, and wherein the registration response is a registration acceptance.

16. The method of claim 15, wherein the method is performed by a base station, and further comprising passing the registration request to a core network along with an indication that the wireless communication device is a likely candidate for proximity based access.

17. The method of claim 14, wherein the registration request is received during the second time period, and wherein the registration response is a registration rejection.

18. The method of claim 17, wherein the method is performed by a base station, and further comprising passing the registration request to a core network along with an indication that the wireless communication device is not a likely candidate for proximity based access.

19. The method of claim 1, wherein the proximity is determined using a record of uplink signal strengths measured during reception of access probes and a record of uplink signal strengths received on a pilot channel on subsequent calls from wireless communication devices that were previously allowed proximity based access.

20. The method of claim 6, further comprising:

sending a registration rejection to the wireless communication device; and

reducing downlink transmit power for a reduced transmit power period.

21. The method of claim 20, further comprising adapting the reduced transmit power period and/or transmit power based on how many registration requests are received during the reduced transmit power period.

22. The method of claim 20, wherein reducing the transmit power comprises reducing the transmit power on a pilot channel.

23. The method of claim 20, wherein reducing the transmit power comprises reducing the transmit power on an overhead (control) channel.

24. The method of claim 20, wherein reducing the transmit power comprises reducing the transmit power on all channels.

25. The method of claim 6, further comprising:

sending a registration rejection to the wireless communication device; and

shutting down transmissions on beacon frequencies for a shutdown period.

26. The method of claim 1, wherein the wireless communication device is legacy user equipment (UE).

27. A wireless device configured for reducing interference to wireless communication devices, comprising:

a processor;

memory in electronic communication with the processor;

instructions stored in the memory, the instructions being executable by the processor to;

determine a proximity of a wireless communication device to the wireless device;

compare the proximity of the wireless communication device with a proximity threshold; and

send a registration response to the wireless communication device based on the comparison.

28. The wireless device of claim 27, wherein the wireless device is a base station.

29. The wireless device of claim 28, wherein the base station is a femto access point.

30. The wireless device of claim 27, wherein the proximity of the wireless communication device represents a pathloss from the base station to the wireless communication device, wherein the pathloss is less than the proximity threshold, and wherein the registration response is a registration acceptance.

31. The wireless device of claim 27, wherein the instructions are further executable to receive a registration request from the wireless communication device, wherein the wireless communication device is not part of a closed subscriber group (CSG) corresponding to the wireless device.

32. The wireless device of claim 31, wherein the registration request is part of an access probe.

33. The wireless device of claim 32, wherein the access probe comprises a received downlink pilot channel quality information.

34. The wireless device of claim 33, wherein the proximity is a function of radio frequency (RF) downlink pathloss and is determined using the received downlink pilot channel quality information and a pilot transmit power.

35. The wireless device of claim 27, wherein the instructions are further executable to broadcast a beacon.

36. The wireless device of claim 27, wherein the registration response comprises a registration rejection.

37. The wireless device of claim 27, wherein the registration response comprises a registration acceptance.

38. The wireless device of claim 37, wherein the instructions are further executable to allow active data/voice communication with the wireless communication device.

39. The wireless device of claim 27, wherein the instructions are further executable to:

broadcast a low power beacon during a first cycle, wherein a first time period corresponds to the first cycle;

broadcast a high power beacon during a second cycle, wherein a second time period corresponds to the second cycle; and

receive a registration request from a wireless communication device.

40. The wireless device of claim 39, wherein the registration request is received during the first time period, and wherein the registration response is a registration acceptance.

41. The wireless device of claim 40, wherein the instructions are further executable to pass the registration request to a core network along with an indication that the wireless communication device is a likely candidate for proximity based access.

42. The wireless device of claim 39, wherein the registration request is received during the second time period, and wherein the registration response is a registration rejection.

43. The wireless device of claim 42, wherein the instructions are further executable to pass the registration request to a core network along with an indication that the wireless communication device is not a likely candidate for proximity based access.

44. The wireless device of claim 27, wherein the proximity is determined using a record of uplink signal strengths measured during reception of access probes and a record of uplink signal strengths received on a pilot channel on subsequent calls from wireless communication devices that were previously allowed proximity based access.

45. The wireless device of claim 31, wherein the instructions are further executable to:

send a registration rejection to the wireless communication device; and

reduce downlink transmit power for a reduced transmit power period.

46. The wireless device of claim 45, wherein the instructions are further executable to adapt the reduced transmit power period based on how many registration requests are received during the reduced transmit power period.

47. The wireless device of claim 45, wherein reducing the transmit power comprises reducing the transmit power on a pilot channel.

48. The wireless device of claim 45, wherein reducing the transmit power comprises reducing the transmit power on an overhead (control) channel.

49. The wireless device of claim 45, wherein reducing the transmit power comprises reducing the total transmit power.

50. The wireless device of claim 31, wherein the instructions are further executable to:

send a registration rejection to the wireless communication device; and

shut down transmissions on beacon frequencies for a shutdown period.

51. The wireless device of claim 27, wherein the wireless communication device is legacy user equipment (UE).

52. A wireless device configured for reducing interference to wireless communication devices, comprising:

means for determining a proximity of a wireless communication device to the wireless device;

means for comparing the proximity of the wireless communication device with a proximity threshold; and

means for sending a registration response to the wireless communication device based on the comparison.

53. A computer-program product for reducing interference to wireless communication devices, the computer-program product comprising a computer-readable medium having instructions thereon, the instructions comprising:

code for determining a proximity of a wireless communication device to the wireless device;

code for comparing the proximity of the wireless communication device with a proximity threshold; and

code for causing a registration response to be sent to the wireless communication device based on the comparison.