INTERFERENCE MANAGEMENT IN A WIRELESS COMMUNICATION SYSTEM USING FREQUENCY SELECTIVE TRANSMISSION

• US 20140233416A1
• Filed: 04/28/2014
• Published: 08/21/2014
• Est. Priority Date: 11/27/2007
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Black, Peter J., Fan, Mingxi, Vanichpun, Sarut, Yavuz, Mehmet
• Granted Patent: US 9,119,217 B2
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04L 25/03343 Arrangements at the transmitter end
• CPC Class Codes: H04W 72/542 using measured or perceived quality

Abstract

Interference that occurs during wireless communication may be managed by determination of a selected transmit waveform exhibiting a preferred channel quality. A method, apparatus and medium of communication determine a transmit waveform from among a plurality of allocated waveforms of an unplanned access point to an associated access terminal. The transmit waveform exhibiting a highest channel quality with an associated access terminal over others of the plurality of allocated waveforms is determined. Signals are transmitted according to the transmit waveform from the unplanned access point to the associated access terminal.

Claims

1. A method of communication, comprising:

determining a transmit waveform from among a plurality of N allocated waveforms of an unplanned access point to an associated access terminal, wherein the plurality of N allocated waveforms are formed from coefficients of an N-tap channel filter with each coefficient set being derived from a specific row in an N×

N digital Fourier transform matrix, the transmit waveform exhibiting a highest channel quality in the presence of interference with the associated access terminal over others of the plurality of allocated waveforms, and wherein the channel quality with the associated access terminal is tested for each of the plurality of allocated waveforms; and

transmitting signals according to the transmit waveform from the unplanned access point to the associated access terminal.

2. The method of claim 1, wherein the determining comprises:

determining a default waveform as the transmit waveform from among the plurality of allocated waveforms; and

designating a different one of the plurality of allocated waveforms as the transmit waveform when one of the plurality of allocated waveforms exhibits a higher channel quality.

3. The method of claim 1, wherein the determining comprises:

testing the channel quality with an associated access terminal of each of the plurality of allocated waveforms of an unplanned access point; and

selecting the transmit waveform as one from among the plurality of allocated waveforms exhibiting the highest channel quality.

4. The method of claim 3, wherein the testing comprises for each of the plurality of allocated waveforms:

transmitting a signal to the associated access terminal using one of the plurality of allocated waveforms; and

receiving an indication of channel quality of the signal from the associated access terminal.

5. The method of claim 1, further comprising repeating the determining of the transmit waveform based on an update period.

6. The method of claim 1, further comprising repeating the determining of the transmit waveform based on deviation of a current channel quality by a channel quality degradation threshold from the highest channel quality.

7. An apparatus for communication, comprising:

an interference controller configured to determine a transmit waveform from among a plurality of N allocated waveforms of an unplanned access point to an associated access terminal, wherein the plurality of N allocated waveforms are formed from coefficients of an N-tap channel filter with each coefficient set being derived from a specific row in an N×

N digital Fourier transform matrix, the transmit waveform exhibiting a highest channel quality in the presence of interference with the associated access terminal over others of the plurality of allocated waveforms, and wherein the channel quality with the associated access terminal is tested for each of the plurality of allocated waveforms; and

a communication controller configured to transmit signals according to the transmit waveform from the unplanned access point to the associated access terminal.

8. The apparatus of claim 7, wherein the interference controller is further configured to determine a default waveform as the transmit waveform from among the plurality of allocated waveforms, and to designate a different one of the plurality of allocated waveforms as the transmit waveform when one of the plurality of allocated waveforms exhibits a higher channel quality.

9. The apparatus of claim 7, wherein the inference controller is further configured to test the channel quality with an associated access terminal of each of the plurality of allocated waveforms of an unplanned access point, and to select the transmit waveform as one from among the plurality of allocated waveforms exhibiting the highest channel quality.

10. The apparatus of claim 9, wherein the communication controller is further configured, for each of the plurality of allocated waveforms, to transmit a signal to the associated access terminal using one of the plurality of allocated waveforms, and to receive an indication of channel quality of the signal from the associated access terminal.

11. The apparatus of claim 7, wherein the interference controller is further configured to repeat the determining of the transmit waveform based on an update period.

12. The apparatus of claim 7, wherein the interference controller is further configured to repeat the determining of the transmit waveform based on deviation of a current channel quality by a channel quality degradation threshold from the highest channel quality.

13. An apparatus for communication, comprising:

means for determining a transmit waveform from among a plurality of N allocated waveforms of an unplanned access point to an associated access terminal, wherein the plurality of N allocated waveforms are formed from coefficients of an N-tap channel filter with each coefficient set being derived from a specific row in an N×

N digital Fourier transform matrix, the transmit waveform exhibiting a highest channel quality in the presence of interference with the associated access terminal over others of the plurality of allocated waveforms, and wherein the channel quality with the associated access terminal is tested for each of the plurality of allocated waveforms; and

means for transmitting signals according to the transmit waveform from the unplanned access point to the associated access terminal.

14. The apparatus of claim 13, wherein the means for determining comprises:

means for determining a default waveform as the transmit waveform from among the plurality of allocated waveforms; and

means for designating a different one of the plurality of allocated waveforms as the transmit waveform when one of the plurality of allocated waveforms exhibits a higher channel quality.

15. The apparatus of claim 13, wherein the means for determining comprises:

means for testing the channel quality with an associated access terminal of each of the plurality of allocated waveforms of an unplanned access point; and

means for selecting the transmit waveform as one from among the plurality of allocated waveforms exhibiting the highest channel quality.

16. The apparatus of claim 15, wherein the means for testing, for each of the plurality of allocated waveforms, comprises:

means for transmitting a signal to the associated access terminal using one of the plurality of allocated waveforms; and

means for receiving an indication of channel quality of the signal from the associated access terminal.

17. The apparatus of claim 13, further comprising means for repeating the determining of the transmit waveform based on an update period.

18. The apparatus of claim 13, further comprising means for repeating the determining of the transmit waveform based on deviation of a current channel quality by a channel quality degradation threshold from the highest channel quality.

19. A computer-program product, comprising:

a non-transitory computer-readable medium comprising codes for causing a computer to;

determine a transmit waveform from among a plurality of N allocated waveforms of an unplanned access point to an associated access terminal, wherein the plurality of N allocated waveforms are formed from coefficients of an N-tap channel filter with each coefficient set being derived from a specific row in an N×

N digital Fourier transform matrix, the transmit waveform exhibiting a highest channel quality in the presence of interference with the associated access terminal over others of the plurality of allocated waveforms, and wherein the channel quality with the associated access terminal is tested for each of the plurality of allocated waveforms; and

transmit signals according to the transmit waveform from the unplanned access point to the associated access terminal.

20. The computer-program product of claim 19, wherein the codes for causing the computer to determine comprise codes for causing the computer to:

determine a default waveform as the transmit waveform from among the plurality of allocated waveforms; and

designate a different one of the plurality of allocated waveforms as the transmit waveform when one of the plurality of allocated waveforms exhibits a higher channel quality.

21. The computer-program product of claim 19, wherein the codes for causing the computer to determine comprise codes for causing the computer to:

test the channel quality with an associated access terminal of each of the plurality of allocated waveforms of an unplanned access point; and

select the transmit waveform as one from among the plurality of allocated waveforms exhibiting the highest channel quality.

22. The computer-program product of claim 21, wherein the codes for causing the computer to test comprise, for each of the plurality of allocated waveforms, codes for causing the computer to:

transmit a signal to the associated access terminal using one of the plurality of allocated waveforms; and

receive an indication of channel quality of the signal from the associated access terminal.

23. The computer-program product of claim 19, further comprising codes for causing the computer to repeat the determining of the transmit waveform based on an update period.

24. The computer-program product of claim 19, further comprising codes for causing the computer to repeat the determining of the transmit waveform based on deviation of a current channel quality by a channel quality degradation threshold from the highest channel quality.