APPARATUS AND METHOD FOR MODIFYING TRANSMISSIONS ON SPECIFIED WIRELESS CHANNELS TO REDUCE INTERFERENCE WITH HIGHER-PRIORITY TRANSMITTERS

• US 20100014599A1
• Filed: 07/16/2008
• Published: 01/21/2010
• Est. Priority Date: 07/16/2008
• Status: Active Grant

• Current Assignee: Honeywell International Inc.
• Original Assignee: Honeywell International Inc.
• Inventors: Budampati, Ramakrishna S., Holm, Henrik
• Granted Patent: US 8,385,436 B2
• Time in Patent Office: Days
• US Class Current: 375/260
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04W 72/02 Selection of wireless resources by user or terminal
• CPC Class Codes: H04W 72/541 using the level of interference
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A method includes obtaining data to be transmitted wirelessly and detecting if any transmitting devices having a higher priority are currently using at least one of multiple wireless channels. The method also includes transmitting the data wirelessly over the multiple wireless channels in a first specified manner when no transmitting devices having the higher priority are detected. The method further includes transmitting at least a portion of the data wirelessly over the multiple wireless channels in a second specified manner when at least one transmitting device having the higher priority is detected. The data could normally be transmitted using OFDM. When a higher-priority transmitting device is detected, at least a portion of the data could be transmitted using a reduced transmit power and a reduced constellation size and/or larger error correcting code. One or more wireless channels associated with one of two quadrature components could also be suppressed.

Claims

1. A method comprising:

obtaining data to be transmitted wirelessly;

detecting if any transmitting devices having a higher priority are currently using at least one of multiple wireless channels;

transmitting the data wirelessly over the multiple wireless channels in a first specified manner when no transmitting devices having the higher priority are detected; and

transmitting at least a portion of the data wirelessly over the multiple wireless channels in a second specified manner when at least one transmitting device having the higher priority is detected.

2. The method of claim 1, wherein transmitting the data wirelessly in the first specified manner comprises transmitting the data over the multiple wireless channels using orthogonal frequency division multiplexing.

3. The method of claim 1, wherein transmitting at least the portion of the data wirelessly in the second specified manner comprises:

reducing a transmit power used to transmit wireless signals over at least one of the multiple wireless channels; and

decreasing a constellation size associated with symbols transmitted over at least one of the multiple wireless channels.

4. The method of claim 1, wherein transmitting at least the portion of the data wirelessly in the second specified manner comprises:

reducing a transmit power used to transmit wireless signals over at least one of the multiple wireless channels; and

increasing a size of an error correcting code transmitted over at least one of the multiple wireless channels.

5. The method of claim 1, wherein transmitting at least the portion of the data wirelessly in the second specified manner comprises:

suppressing one or more wireless channels associated with one of two quadrature components used to transmit the data.

6. The method of claim 5, wherein:

the partially suppressed quadrature component is used to transmit higher-rate data; and

one unsuppressed quadrature component is used to transmit lower-rate data.

7. The method of claim 1, wherein the multiple wireless channels comprise frequency sub-bands.

8. The method of claim 1, wherein the transmitting devices having the higher priority comprise a licensed user authorized to transmit on at least one of the multiple wireless channels.

9. An apparatus comprising:

a transceiver configured to transmit wireless signals over multiple wireless channels; and

a controller configured to;

detect if any transmitting devices having a higher priority are currently using at least one of the multiple wireless channels;

initiate transmission of data wirelessly over the multiple wireless channels in a first specified manner when no transmitting devices having the higher priority are detected; and

initiate transmission of at least a portion of the data wirelessly over the multiple wireless channels in a second specified manner when at least one transmitting device having the higher priority is detected.

10. The apparatus of claim 9, wherein the controller is configured to initiate the transmission of the data in the first specified manner using orthogonal frequency division multiplexing.

11. The apparatus of claim 9, wherein the controller is configured to initiate the transmission of at least the portion of the data wirelessly in the second specified manner using a reduced transmit power and using a reduced constellation size associated with symbols transmitted over at least one of the multiple wireless channels.

12. The apparatus of claim 9, wherein the controller is configured to initiate the transmission of at least the portion of the data wirelessly in the second specified manner using a reduced transmit power and using a larger error correcting code transmitted over at least one of the multiple wireless channels.

13. The apparatus of claim 9, wherein the controller is configured to initiate the transmission of at least the portion of the data wirelessly in the second specified manner by suppressing one or more wireless channels associated with one of two quadrature components used to transmit the data.

14. The apparatus of claim 13, wherein:

the partially suppressed quadrature component is used to transmit higher-rate data; and

one unsuppressed quadrature component is used to transmit lower-rate data.

15. The apparatus of claim 9, wherein the multiple wireless channels comprise frequency sub-bands.

16. A computer readable medium comprising a computer program embodied on the computer readable medium, the computer program comprising:

computer readable program code for detecting if any transmitting devices having a higher priority are currently using at least one of multiple wireless channels;

computer readable program code for initiating transmission of data wirelessly over the multiple wireless channels in a first specified manner when no transmitting devices having the higher priority are detected; and

computer readable program code for initiating transmission of at least a portion of the data wirelessly over the multiple wireless channels in a second specified manner when at least one transmitting device having the higher priority is detected.

17. The computer readable medium of claim 16, wherein the computer readable program code for initiating the transmission of the data in the first specified manner comprises:

computer readable program code for initiating the transmission of the data over the multiple wireless channels using orthogonal frequency division multiplexing.

18. The computer readable medium of claim 16, wherein the computer readable program code for initiating the transmission of at least the portion of the data in the second specified manner comprises:

computer readable program code for initiating the transmission using a reduced transmit power and a reduced constellation size associated with symbols transmitted over at least one of the multiple wireless channels.

19. The computer readable medium of claim 16, wherein the computer readable program code for initiating the transmission of at least the portion of the data in the second specified manner comprises:

computer readable program code for initiating the transmission using a reduced transmit power and using a larger error correcting code transmitted over at least one of the multiple wireless channels.

20. The computer readable medium of claim 16, wherein the computer readable program code for initiating the transmission of at least the portion of the data in the second specified manner comprises:

computer readable program code for suppressing one or more wireless channels associated with one of two quadrature components used to transmit the data.