METHODS AND APPARATUS SUPPORTING ADAPTIVE DECENTRALIZED TRAFFIC SCHEDULING FOR WIRELESS COMMUNICATIONS

• US 20100118733A1
• Filed: 11/10/2008
• Published: 05/13/2010
• Est. Priority Date: 10/31/2007
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Tavildar, Saurabh, Richardson, Thomas, Laroia, Rajiv, Wu, Xinzhou, Li, Junyi, Sundararajan, Jay Kumar, Shakkottai, Sanjay
• Granted Patent: US 8,072,917 B2
• Time in Patent Office: Days
• US Class Current: 370/254
• CPC Class Codes: H04W 52/265 taking into account the quality of service QoS
• CPC Class Codes: H04W 52/343 taking into account loading or congestion level

Abstract

Methods and apparatus relating to scheduling of air link resources, e.g., traffic segments, in wireless communications are described. Various described methods and apparatus are well suited to wireless peer to peer networks in which traffic scheduling is decentralized, e.g. an ad hoc peer to peer network. A first wireless terminal receives a transmission request and quality of service information from a second wireless terminal corresponding to a connection. The first wireless terminal decides not to receiver yield, determines a request response transmission power level as a function of the received quality of service information, and transmits, at the determined power level, a generated request response signal. By controllably adjusting the transmission power level of a request response, transmitter yielding decisions of lower priority links are impacted, since lower priority links measure and use received power level information corresponding to request responses of higher priority links in their transmitter yielding decisions.

Claims

1. A method of operating a first wireless terminal in a peer to peer communications system, the method comprising:

receiving quality of service information corresponding to a communications link from a second wireless terminal to the first wireless terminal;

receiving a transmission request from the second wireless terminal;

determining a request response transmission power level based on received quality of service information; and

transmitting, at the determined power level, a request response in response to the received transmission request.

2. The method of claim 1, wherein said second and first wireless terminals are mobile devices.

3. The method of claim 1, wherein said quality of service information is based on the type of data to be transmitted by the second wireless terminal to the first wireless terminal in a traffic slot corresponding to said transmission request.

4. The method of claim 1, wherein said quality of service information is based on the amount of data waiting to be transmitted by the second wireless terminal to the first wireless terminal.

5. The method of claim 1, wherein said quality of service information and said transmission request are received in separate signals.

6. The method of claim 1, wherein said quality of service information and said transmission request are received in a single signal.

7. The method of claim 1, wherein determining a request response transmission power includes increasing the request response transmission power level from a previously determined request response transmission power level.

8. The method of claim 1, wherein determining a request response transmission power includes decreasing the request response transmission power level from a previously determined request response transmission power level.

9. The method of claim 1, wherein determining a request response transmission power includes:

determining a minimum request response transmission power level based on the received power of the transmission request; and

decreasing, when the previous determined request response transmission power level exceeds the determined minimum request response transmission power level and when said quality of service information indicates an decrease in a quality of service corresponding to the communications link from the second wireless terminal to the first wireless terminal, the request response transmission power level from a previously determined request response transmission power level.

30. The computer program product of claim 1, wherein said quality of service information is based on the type of data to be transmitted by the second wireless terminal to the first wireless terminal in a traffic slot corresponding to said transmission request.

10. A first wireless terminal in a peer to peer communications system, the first wireless terminal comprising:

at least one processor configured to;

receive quality of service information corresponding to a communications link from a second wireless terminal to the first wireless terminal;

receive a transmission request from the second wireless terminal;

determine a request response transmission power level based on received quality of service information; and

transmit, at the determined power level, a request response in response to the received transmission request;

and memory coupled to said at least one processor.

11. The first wireless terminal of claim 10, wherein said second and first wireless terminals are mobile devices.

12. The first wireless terminal of claim 10, wherein said quality of service information is based on the type of data to be transmitted by the second wireless terminal to the first wireless terminal in a traffic slot corresponding to said transmission request.

13. The first wireless terminal of claim 10, wherein said quality of service information is based on the amount of data waiting to be transmitted by the second wireless terminal to the first wireless terminal.

14. The first wireless terminal of claim 10, wherein said quality of service information and said transmission request are received in separate signals.

15. The first wireless terminal of claim 10, wherein said quality of service information and said transmission request are received in a single signal.

16. The first wireless terminal of claim 10, wherein said at least one processor is configured to increase the request response transmission power level from a previously determined request response transmission power level as part of being configured to determine a request response transmission power.

17. The first wireless terminal of claim 10, wherein said at least one processor is configured to decrease the request response transmission power level from a previously determined request response transmission power level as part of being configured to determine a request response transmission power.

18. The first wireless terminal of claim 10, wherein said at least one processor is configured to:

determine a minimum request response transmission power level based on the received power of the transmission request; and

decrease, when the previous determined request response transmission power level exceeds the determined minimum request response transmission power level and when said quality of service information indicates an decrease in a quality of service corresponding to the communications link from the second wireless terminal to the first wireless terminal, the request response transmission power level from a previously determined request response transmission power level, as part of being configured to determine a request response transmission power.

19. A first wireless terminal in a peer to peer communications system, the first communications device comprising:

means for receiving quality of service information corresponding to a communications link from a second wireless terminal to the first wireless terminal;

means for receiving a transmission request from the second wireless terminal;

means for determining a request response transmission power level based on received quality of service information; and

means for transmitting, at the determined power level, a request response in response to the received transmission request.

20. The first wireless terminal of claim 19, wherein said second and first wireless terminals are mobile devices.

21. The first wireless terminal of claim 19, wherein said quality of service information is based on the type of data to be transmitted by the second wireless terminal to the first wireless terminal in a traffic slot corresponding to said transmission request.

22. The first wireless terminal of claim 19, wherein said quality of service information is based on the amount of data waiting to be transmitted by the second wireless terminal to the first wireless terminal.

23. The first wireless terminal of claim 19, wherein said quality of service information and said transmission request are received in separate signals.

24. The first wireless terminal of claim 19, wherein said quality of service information and said transmission request are received in a single signal.

25. The first wireless terminal of claim 19, wherein said means for determining a request response transmission power includes means for increasing the request response transmission power level from a previously determined request response transmission power level.

26. The first wireless terminal of claim 19, wherein said means for determining a request response transmission power includes means for decreasing the request response transmission power level from a previously determined request response transmission power level.

27. The first wireless terminal of claim 19, wherein said means for determining a request response transmission power includes:

means for determining a minimum request response transmission power level based on the received power of the transmission request; and

means for decreasing, when the previous determined request response transmission power level exceeds the determined minimum request response transmission power level and when said quality of service information indicates an decrease in a quality of service corresponding to the communications link from the second wireless terminal to the first wireless terminal, the request response transmission power level from a previously determined request response transmission power level.

28. A computer program product for use in a first wireless terminal in a peer to peer communications system, the computer program product comprising:

a computer readable medium comprising;

code for causing at least one computer to receive quality of service information corresponding to a communications link from a second wireless terminal to the first wireless terminal;

code for causing the at least one computer to receive a transmission request from the second wireless terminal;

code for causing the at least one computer to determine a request response transmission power level based on the received quality of service information; and

code for causing the at least one computer to control transmitting, at the determined power level, a request response in response to the received transmission request.

29. The computer program product of claim 28, wherein said second and first wireless terminals are mobile devices.