Managing transmit power for better frequency re-use in TV white space

Patent metadata

Field	Value
Publication number	US-9585025-B2
Application number	US-201213397473-A
Country	US
Kind code	B2
Filing date	Feb 15, 2012
Priority date	Feb 16, 2011
Publication date	Feb 28, 2017
Grant date	Feb 28, 2017

Abstract

Certain aspects of the present disclosure provide techniques and apparatus for managing transmit power in a television white space (TVWS) network. By managing transmit power as described herein, medium re-use may be improved in such a network, and unfair usage problems may be alleviated. One example method generally includes receiving, from an apparatus, a message with an indication of a highest transmit power used by the apparatus for transmitting data frames; and determining that the apparatus is a dominant interferer based, at least in part, on the highest transmit power. Another example method generally includes receiving, from an apparatus, a control or management message with a first indication of a first transmit power used by the apparatus for transmitting data frames; and determining that the apparatus is a dominant interferer based, at least in part, on the first transmit power.

First claim

The invention claimed is:

1. An apparatus for wireless communications, comprising:
a processing system configured to determine a highest transmit power for transmitting data frames from the apparatus; and
a transmitter configured to transmit a message with an indication of the highest transmit power,
wherein the message comprises another indication of a second transmit power for transmitting the message, wherein the transmitter is configured to transmit the message using the second transmit power.

2. The apparatus of claim 1 , wherein the message comprises a beacon.

3. The apparatus of claim 2 , wherein the indication comprises an information element (IE) in the beacon.

4. The apparatus of claim 1 , wherein the transmitter is configured to transmit the message via one or more channels in a television white space (TVWS).

5. The apparatus of claim 1 , wherein the message comprises a broadcast message.

6. A method for wireless communications, comprising:
determining a highest transmit power for transmitting data frames; and
transmitting a message with an indication of the highest transmit power,
wherein the message comprises another indication of a second transmit power for transmitting the message, wherein the transmitting comprises transmitting the message using the second transmit power.

7. The method of claim 6 , wherein the message comprises a beacon.

8. The method of claim 7 , wherein the indication comprises an information element (IE) in the beacon.

9. The method of claim 6 , wherein transmitting the message comprises transmitting the message via one or more channels in a television white space (TVWS).

10. The method of claim 6 , wherein the message comprises a broadcast message.

11. An apparatus for wireless communications, comprising:
means for determining a highest transmit power for transmitting data frames from the apparatus; and
means for transmitting a message with an indication of the highest transmit power,
wherein the message comprises another indication of a second transmit power for transmitting the message, wherein the means for transmitting is configured to transmit the message using the second transmit power.

12. A non-transitory computer-readable medium comprising instructions executable to:
determine a highest transmit power for transmitting data frames from an apparatus; and
transmit a message from the apparatus with an indication of the highest transmit power,
wherein the message comprises another indication of a second transmit power for transmitting the message, wherein the transmitting comprises transmitting the message using the second transmit power.

13. An access point, comprising:
at least one antenna;
a processing system configured to determine a highest transmit power for transmitting data frames from the access point; and
a transmitter configured to transmit, via the at least one antenna, a message with an indication of the highest transmit power,
wherein the message comprises another indication of a second transmit power for transmitting the message, wherein the transmitting comprises transmitting the message using the second transmit power.

14. A first apparatus for wireless communications, comprising:
a receiver configured to receive, from a second apparatus, a message with an indication of a highest transmit power used by the second apparatus for transmitting data frames; and
a processing system configured to determine that the second apparatus is a dominant interferer based, at least in part, on the highest transmit power, wherein the message comprises another indication of a second transmit power used by the second apparatus for transmitting the message, and wherein the processing system is configured to determine that the second apparatus is the dominant interferer based on the highest transmit power and the second transmit power; and
a transmitter configured to transmit a clear-to-send (CTS) message at a transmit power level sufficient to reach the dominant interferer.

15. The first apparatus of claim 14 , wherein the processing system is configured to determine a received power associated with the message and to determine a path loss based on the received power.

16. The first apparatus of claim 15 , wherein the processing system is configured to determine that the second apparatus is the dominant interferer based on the highest transmit power and the path loss.

17. The first apparatus of claim 14 , wherein the processing system is configured to determine a received power associated with the message and to determine a path loss based on the received power and the second transmit power.

18. The first apparatus of claim 17 , wherein the processing system is configured to determine that the second apparatus is the dominant interferer based on the highest transmit power and the path loss.

19. The first apparatus of claim 14 , wherein the receiver is configured to receive, from a third apparatus, another message with another indication of a highest transmit power used by the third apparatus for transmitting data frames and wherein the processing system is configured to determine that the third apparatus is another dominant interferer based, at least in part, on the highest transmit power used by the third apparatus.

20. The first apparatus of claim 19 , further comprising a transmitter configured to transmit a clear-to-send (CTS) message at the higher of a first transmit power level sufficient to reach the third apparatus and a second transmit power level sufficient to reach the second apparatus.

21. The first apparatus of claim 14 , wherein the receiver is configured to receive the message via one or more channels in a television white space (TVWS).

22. A method for wireless communications, comprising:
receiving, from an apparatus, a message with an indication of a highest transmit power used by the apparatus for transmitting data frames; and
determining that the apparatus is a dominant interferer based, at least in part, on the highest transmit power, wherein the message comprises another indication of a second transmit power used by the apparatus for transmitting the message, wherein determining that the apparatus is the dominant interferer is based on the highest transmit power and the second transmit power; and
transmitting a clear-to-send (CTS) message at a transmit power level sufficient to reach the dominant interferer.

23. The method of claim 22 , further comprising:
determining a received power associated with the message; and
determining a path loss based on the received power.

24. The method of claim 23 , wherein determining that the apparatus is the dominant interferer is also based on the path loss.

25. The method of claim 22 , wherein the method further comprises:
determining a received power associated with the message; and
determining a path loss based on the received power and the second transmit power.

26. The method of claim 25 , wherein determining that the apparatus is the dominant interferer is also based on the path loss.

27. The method of claim 22 , further comprising:
receiving, from a second apparatus, another message with another indication of a highest transmit power used by the second apparatus for transmitting data frames; and
determining that the second apparatus is another dominant interferer based, at least in part, on the highest transmit power used by the second apparat

Assignees

• Abraham Santosh Paul
• Vermani Sameer
• Sampath Hemanth
• Shellhammer Stephen J
• Tandra Rahul
• Qualcomm Inc

Inventors

• Abraham Santosh Paul
• Vermani Sameer
• Sampath Hemanth
• Shellhammer Stephen J
• Tandra Rahul

Classifications

• H04W52/242

  taking into account path loss · CPC title

• H04W52/325

  Power control of control or pilot channels · CPC title

• H04W52/367

  Power values between minimum and maximum limits, e.g. dynamic range · CPC title

• H04W74/0808

  using carrier sensing, e.g. carrier sense multiple access [CSMA] · CPC title

• H04W16/14 Primary

  Spectrum sharing arrangements {between different networks} · CPC title