Method and apparatus for dynamically adjusting a rise-over-thermal or noise rise threshold

• US 9,008,714 B2
• Filed: 12/20/2011
• Issued: 04/14/2015
• Est. Priority Date: 12/23/2010
• Status: Expired due to Fees

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Tokgoz, Yeliz, Yavuz, Mehmet, Meshkati, Farhad
• Primary Examiner(s): WEST, LEWIS G
• Application Number:
  US13/331,395
• Publication Number:
  US 20120329399A1
• Time in Patent Office: 1,211 Days
• Field of Search: 455/63.1, 455/67.11
• US Class Current: 455/522
• CPC Class Codes: H04B 17/345 Interference values signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR] H04B17/336
• CPC Class Codes: H04W 52/225 Calculation of statistics, e.g. average, variance
• CPC Class Codes: H04W 52/243 taking into account interferences
• CPC Class Codes: H04W 52/244 Interferences in heterogeneous networks, e.g. among macro and femto or pico cells or other sector / system interference [OSI]

Abstract

Methods and apparatuses are provided that include adjusting rise-over-thermal (RoT) or noise rise (NR) threshold based on detecting interference from one or more devices. A device can communicate within close proximity of a femto node such that the device does not respond to power down commands from the femto node due to operating at a minimum transmit power. The device can cause the RoT or NR at the femto node to potentially rise over a threshold, however. Thus, the femto node can increase the RoT or NR threshold to allow the device to communicate with the femto node without impacting other devices communicating with the femto node. Out-of-cell interference from devices communicating with other base stations can be detected as well, and the RoT or NR threshold can be adjusted based thereon.

Claims

1. A method for adjusting a rise-over-thermal (RoT) or noise rise (NR) threshold, comprising:

communicating with one or more devices to provide network access;

detecting a change in a level of interference caused by a signal from at least one device in the one or more devices, wherein detecting the change in the level of interference comprises detecting an increase in a received signal power of the signal received from the at least one device;

determining that the at least one device transmits the signal at a minimum transmit power, wherein determining that the at least one device transmits the signal at a minimum transmit power comprises determining that the at least one device does not respond to one or more commands to decrease the power for transmitting the signal; and

adjusting an RoT or NR threshold in proportion to the level of interference detected and based on the determination that the at least one device transmits the signal at a minimum transmit power.

2. The method of claim 1, further comprising determining an upper limit for the RoT or NR threshold based in part on a determined proximity to one or more base stations, wherein the adjusting is based in part on the upper limit.

3. The method of claim 1, further comprising:

detecting a decrease in the interference caused by a second signal from the at least one device; and

decreasing the RoT or NR threshold based in part on detecting the decrease in the interference, wherein the at least one device is previously determined to transmit at a minimum transmit power.

4. An apparatus for adjusting a rise-over-thermal (RoT) or noise rise (NR) threshold, comprising:

at least one processor configured to;

communicate with one or more devices to provide network access;

detect a change in a level of interference caused by a signal from at least one device in the one or more devices, wherein detecting the change in the level of interference comprises detecting an increase in a received signal power of the signal received from the at least one device;

determine that the at least one device transmits the signal at a minimum transmit power, wherein determining that the at least one device transmits the signal at a minimum transmit power comprises determining that the at least one device does not respond to one or more commands to decrease the power for transmitting the signal; and

adjust an RoT or NR threshold in proportion to the level of interference detected and based on the determination that the at least one device transmits the signal at a minimum transmit power; and

a memory coupled to the at least one processor.

5. The apparatus of claim 4, wherein the at least one processor is further configured to determine an upper limit for the RoT or NR threshold based in part on a determined proximity to one or more base stations, wherein the at least one processor adjusts the RoT or NR threshold based in part on the upper limit.

6. The apparatus of claim 4, wherein the at least one processor is further configured to:

detect a decrease in the interference caused by a second signal from the at least one device; and

decrease the RoT or NR threshold based in part on the decrease in the interference, wherein the at least one device is previously determined to transmit at a minimum transmit power.

7. An apparatus for adjusting a rise-over-thermal (RoT) or noise rise (NR) threshold, comprising:

means for communicating with one or more devices to provide network access;

means for detecting a change in a level of interference caused by a signal from at least one device in the one or more devices, wherein the means for detecting the change in the level of interference comprise means for detecting an increase in a received signal power of the signal received from the at least one device;

means for determining that the at least one device transmits the signal at a minimum transmit power, wherein the means for determining that the at least one device transmits the signal at a minimum transmit power comprise means for determining that the at least one device does not respond to one or more commands to decrease the power for transmitting the signal; and

means for adjusting an RoT or NR threshold in proportion to the level of interference detected and based on the determination that the at least one device transmits the signal at a minimum transmit power.

8. The apparatus of claim 7, wherein the means for adjusting determines an upper limit for the RoT or NR threshold based in part on a determined proximity to one or more base stations, and adjusts the RoT or NR threshold based in part on the upper limit.

9. The apparatus of claim 7, wherein the means for detecting detects a decrease in the interference caused by a second signal from the at least one device, wherein the means for adjusting decreases the RoT or NR threshold based in part on the decrease in interference, and wherein the at least one device is previously determined to transmit at a minimum transmit power.

10. A non-transitory computer-readable medium, comprising:

code for causing at least one computer to communicate with one or more devices to provide network access;

code for causing the at least one computer to detect a change in a level of interference caused by a signal from at least one device in the one or more devices, wherein the code for causing the at least one computer to detect the change in the level of interference comprises code for causing the at least one computer to detect an increase in a received signal power of the signal received from the at least one device;

code for causing the at least one computer to determine that the at least one device transmits the signal at a minimum transmit power, wherein the code for causing the at least one computer to determine that the at least one device transmits the signal at a minimum transmit power comprises code for causing the at least one computer to determine that the at least one device does not respond to one or more commands to decrease the power for transmitting the signal; and

code for causing the at least one computer to adjust rise-over-thermal (RoT) or noise rise (NR) threshold in proportion to the level of interference detected and based on the determination that the at least one device transmits the signal at a minimum transmit power.

11. The non-transitory computer-readable medium of claim 10, further comprising code for causing the at least one computer to determine an upper limit for the RoT or NR threshold based in part on a determined proximity to one or more base stations, wherein the code for causing the at least one computer to adjust adjusts the RoT or NR threshold based in part on the upper limit.

12. The non-transitory computer-readable medium of claim 10, further comprising:

code for causing the at least one computer to detect a decrease in the interference caused by a second signal from the at least one device; and

code for causing the at least one computer to decrease the RoT or NR threshold based in part on the decrease in the interference, wherein the at least one device is previously determined to transmit at a minimum transmit power.

13. An apparatus for adjusting a rise-over-thermal (RoT) or noise rise (NR) threshold, comprising:

a transceiver component for communicating with one or more devices to provide network access;

an interference detecting component for;

detecting a change in a level of interference caused by a signal from at least one device in the one or more devices, wherein detecting the change in the level of interference comprises detecting an increase in a received signal power of the signal received from the at least one device, and

determining that the at least one device transmits the signal at a minimum transmit power, wherein determining that the at least one device transmits the signal at a minimum transmit power comprises determining that the at least one device does not respond to one or more commands to decrease the power for transmitting the signal; and

an RoT threshold adjusting component for adjusting an RoT or NR threshold in proportion to the level of interference detected and based on the determination that the at least one device transmits the signal at a minimum transmit power.

14. The apparatus of claim 13, wherein the RoT threshold adjusting component determines an upper limit for the RoT or NR threshold based in part on a determined proximity to one or more base stations, and adjusts the RoT or NR threshold based in part on the upper limit.

15. The apparatus of claim 13, wherein the interference detecting component detects a decrease in the interference caused by a second signal from the at least one device, and wherein the RoT threshold adjusting component decreases the RoT or NR threshold based in part on the decrease in the interference, wherein the at least one device is previously determined to transmit at a minimum transmit power.