Methods for sending small packets in a peer-to-peer (P2P) network

• US 8,259,743 B2
• Filed: 07/07/2008
• Issued: 09/04/2012
• Est. Priority Date: 07/09/2007
• Status: Expired due to Fees

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Li, Junyi, Laroia, Rajiv, Tavildar, Saurabh, Wu, Xinzhou
• Primary Examiner(s): Pham, Chi
• Application Number:
  US12/168,662
• Publication Number:
  US 20090016271A1
• Time in Patent Office: 1,520 Days
• Field of Search: None
• US Class Current: 370/431
• CPC Class Codes: H04L 1/0002 by adapting the transmission rate
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

An improved mechanism is provided that facilitates transmission of small packets within an ad hoc peer-to-peer network. A small packet is identified to a receiver within a control channel so that its lower power can be considered in an interference management protocol implemented among local peer devices. In a traffic slot, a transmitter voluntarily backs down on the transmitter power as a smaller packet will require much lower signal-to-noise ratio. This will improve the signal energy per bit per noise power density for the transmission as well as minimize the interference caused to other wireless communications happening in the same spectrum.

Claims

1. A method operational at a second device having a peer-to-peer connection with a first device to facilitate interference management of small packet transmissions in an ad hoc wireless network, comprising:

receiving a signal in a plurality of predetermined subsets of resource units, said resource units being time-frequency resource units, at least some of said time-frequency resource units corresponding to different tones;

calculating a first signal phase used in a desired signal in each of the plurality of predetermined subsets of resource units, the desired signal being sent by the first device; and

determining one time-frequency resource unit in each of the plurality of predetermined subsets of resource units in which the desired signal is sent as a function of the received signal and calculated first signal phase.

2. The method of claim 1, further comprising:

recovering information bits transported in the desired signal from the location of the determined one time-frequency resource unit in each of the plurality of predetermined subsets of resource units.

3. The method of claim 2, wherein the calculated first signal phase is the same in each of the plurality of predetermined subsets of resource units and is generated from at least one of a first identifier of the first device, a second identifier of the second device, and an identifier of the peer-to-peer connection between the first and the second devices.

4. The method of claim 2, wherein the calculated first signal phase is determined as a function of a predetermined sequence, the calculated first signal phase being different in the different predetermined subsets of resource units.

5. The method of claim 4, wherein the predetermined sequence is generated from at least one of a first identifier of the first device, a second identifier of the second device, and an identifier of the peer-to-peer connection between the first and the second devices.

6. The method of claim 2, further comprising:

calculating a power to be used in the desired signal in each of the plurality of predetermined subsets of resource units, wherein the calculated power is determined as a function of a predetermined sequence, the calculated power being different in the different predetermined subsets of resource units, and wherein the one time-frequency resource unit is determined also as a function of the calculated power.

7. The method of claim 1, further comprising:

calculating a second phase to be used in an interference signal in each of the plurality of predetermined subsets of resource units, the interference signal being transmitted by an interfering device; and

wherein the one time-frequency resource unit is determined also as a function of the calculated second phase.

8. A second device having a peer-to-peer connection with a first device to facilitate interference management of small packet transmissions in an ad hoc wireless network, comprising:

a transmitter and receiver for establishing the peer-to-peer communication connection with the first device;

a processing circuit coupled to the transmitter and receiver, wherein the processing circuit is adapted to;

receive a signal in a plurality of predetermined subsets of resource units, said resource units being time-frequency resource units, at least some of said time-frequency resource units corresponding to different tones;

calculate a first signal phase used in a desired signal in each of the plurality of predetermined subsets of resource units, the desired signal being sent by the first device; and

determine one time-frequency resource unit in each of the plurality of predetermined subsets of resource units in which the desired signal is sent as a function of the received signal and calculated first signal phase.

9. The second device of claim 8, wherein the processing circuit is further adapted to:

recover information bits transported in the desired signal from the location of the determined one time-frequency resource unit in each of the plurality of predetermined subsets of resource units.

10. The second device of claim 9, wherein the calculated first signal phase is the same in each of the plurality of predetermined subsets of resource units and is generated from at least one of a first identifier of the first device, a second identifier of the second device, and an identifier of the peer-to-peer connection between the first and the second devices.

11. The second device of claim 9, wherein the calculated first signal phase is determined as a function of a predetermined sequence, the calculated first signal phase being different in the different predetermined subsets of resource units.

12. The second device of claim 11, wherein the predetermined sequence is generated from at least one of a first identifier of the first device, a second identifier of the second device, and an identifier of the peer-to-peer connection between the first and the second devices.

13. The second device of claim 9, wherein the processing circuit is further adapted to:

calculate a power to be used in the desired signal in each of the plurality of predetermined subsets of resource units, wherein the calculated power is determined as a function of a predetermined sequence, the calculated power being different in the different predetermined subsets of resource units, and wherein the one time-frequency resource unit is determined also as a function of the calculated power.

14. The second device of claim 8, wherein the processing circuit is further adapted to:

calculate a second signal phase to be used in an interference signal in each of the plurality of predetermined subsets of resource units, the interference signal being transmitted by an interfering device; and

wherein the one time-frequency resource unit is determined also as a function of the calculated second signal phase.

15. A second device having a peer-to-peer connection with a first device to facilitate interference management of small packet transmissions in an ad hoc wireless network, comprising:

means for receiving a signal in a plurality of predetermined subsets of resource units, said resource units being time-frequency resource units, at least some of said time-frequency resource units corresponding to different tones;

means for calculating a first signal phase to be used in a desired signal in each of the plurality of predetermined subsets of resource units, the desired signal being sent by the first device; and

means for determining one time-frequency resource unit in each of the plurality of predetermined subsets of resource units in which the desired signal is sent as a function of the received signal and calculated first signal phase.

16. The second device of claim 15, further comprising:

means for recovering information bits transported in the desired signal from the location of the determined one time-frequency resource unit in each of the plurality of predetermined subsets of resource units.

17. The second device of claim 16, wherein the calculated first signal phase is the same in each of the plurality of predetermined subsets of resource units and is generated from at least one of a first identifier of the first device, a second identifier of the second device, and an identifier of the peer-to-peer connection between the desired and the second devices.

18. The second device of claim 16, further comprising:

means for calculating a power to be used in the desired signal in each of the plurality of predetermined subsets of resource units, wherein the calculated power is determined as a function of a predetermined sequence, the calculated power being different in the different predetermined subsets of resource units, and wherein the one time-frequency resource unit is determined also as a function of the calculated power.

19. The second device of claim 16, further comprising:

means for calculating a second signal phase to be used in an interference signal in each of the plurality of predetermined subsets of resource units, the interference signal being transmitted by an interfering device, and wherein the one time-frequency resource unit is also determined as a function of the calculated second signal phase.

20. A non-transitory machine-readable medium comprising instructions for a second device having a peer-to-peer connection with a first device to facilitate interference management of small packet transmissions in an ad hoc wireless network, which when executed by a processor causes the processor to:

receive a signal in a plurality of predetermined subsets of resource units, said resource units being time-frequency resource units, at least some of said time-frequency resource units corresponding to different tones;

calculate a first signal phase to be used in a desired signal in each of the plurality of predetermined subsets of resource units, the desired signal being sent by the first device; and

determine one time-frequency resource unit in each of the plurality of predetermined subsets of resource units in which the desired signal is sent as a function of the received signal and calculated first signal phase.

21. A method operational at a first device having a peer-to-peer connection with a second device to facilitate interference management of small packet transmissions within an ad hoc wireless network, comprising:

partitioning a set of resource units into a plurality of predetermined subsets of resource units, said resource units being time-frequency resource units, at least some of said time-frequency resource units corresponding to different tones;

determining one time-frequency resource unit in each of the plurality of predetermined subsets of resource units as a function of a set of bits; and

transmitting signals using the determined time-frequency resource units, each signal transmitted in one of the determined time-frequency resource units having a signal phase, the signal phase of each of the signals transmitted using the determined time-frequency resource units in said plurality of predetermined subsets of resource units, being the same.

22. The method of claim 21, wherein the set of bits are generated from a set of information bits with an encoder.

23. The method of claim 22, wherein the signal phase is generated from at least one of a first identifier of the first device, a second identifier of the second device, and an identifier of the peer-to-peer connection between the first and the second devices.

26. The method of claim 22, further comprising:

generating a plurality of power values as a function of a predetermined sequence, wherein the power of the transmitted signal in the determined one time-frequency resource unit in each of the plurality of predetermined subsets of resource units is equal to one of the generated plurality of power values.

24. A method operational at a first device having a peer-to-peer connection with a second device to facilitate interference management of small packet transmissions within an ad hoc wireless network, comprising:

partitioning a set of resource units into a plurality of predetermined subsets of resource units;

determining one resource unit in each of the plurality of predetermined subsets of resource units as a function of a set of bits, said set of bits being generated from a set of information bits with an encoder;

transmitting a signal in the determined one resource unit in each of the plurality of predetermined subsets of resource units; and

generating a plurality of phases as a function of a predetermined sequence, wherein a phase of the transmitted signal in the determined one resource unit in each of the plurality of predetermined subsets of resource units is equal to one of the generated plurality of phases.

25. The method of claim 24, wherein the predetermined sequence is generated from at least one of a first identifier of the first device, a second identifier of the second device, and an identifier of the peer-to-peer connection between the first and the second devices.

27. A first device having a peer-to-peer connection with a second device to facilitate interference management of small packet transmissions within an ad hoc wireless network, comprising:

a transmitter and receiver for establishing the peer-to-peer communication connection with the first device;

a processing circuit coupled to the transmitter and receiver, wherein the processing circuit is adapted to;

partition a set of resource units into a plurality of predetermined subsets of resource units, said resource units being time-frequency resource units, at least some of said time-frequency resource units corresponding to different tones;

determine one time-frequency resource unit in each of the plurality of predetermined subsets of resource units as a function of a set of bits; and

transmit signals using the determined time-frequency resource units, each signal transmitted in one of the determined time-frequency resource units having a signal phase, the signal phase of each of the signals transmitted using the determined time-frequency resource units in said plurality of predetermined subsets of resource units, being the same.

28. The first device of claim 27, wherein the set of bits are generated from a set of information bits with an encoder.

29. The first device of claim 28, wherein the signal phase is generated from at least one of a first identifier of the first device, a second identifier of the second device, and an identifier of the peer-to-peer connection between the first and the second devices.

32. The first device of claim 28, wherein the processing circuit is adapted to:

generate a plurality of power values as a function of a predetermined sequence, wherein the power of the transmitted signal in the determined one time-frequency resource unit in each of the plurality of predetermined subsets of resource units is equal to one of the generated plurality of power values.

30. A first device having a peer-to-peer connection with a second device to facilitate interference management of small packet transmissions within an ad hoc wireless network, comprising:

a transmitter and receiver for establishing the peer-to-peer communication connection with the first device;

a processing circuit coupled to the transmitter and receiver, wherein the processing circuit is adapted to;

partition a set of resource units into a plurality of predetermined subsets of resource units;

determine one resource unit in each of the plurality of predetermined subsets of resource units as a function of a set of bits, said set of bits being generated from a set of information bits with an encoder;

transmit a signal in the determined one resource unit in each of the plurality of predetermined subsets of resource units; and

generate a plurality of phases as a function of a predetermined sequence, wherein a phase of the transmitted signal in the determined one resource unit in each of the plurality of predetermined subsets of resource units is equal to one of the generated plurality of phases.

31. The first device of claim 30, wherein the predetermined sequence is generated from at least one of a first identifier of the first device, a second identifier of the second device, and an identifier of the peer-to-peer connection between the first and the second devices.

33. A first device having a peer-to-peer connection with a second device to facilitate interference management of small packet transmissions within an ad hoc wireless network, comprising:

means for partitioning a set of resource units into a plurality of predetermined subsets of resource units, said resource units being time-frequency resource units, at least some of said time-frequency resource units corresponding to different tones;

means for determining one time-frequency resource unit in each of the plurality of predetermined subsets of resource units as a function of a set of bits; and

means for transmitting signals using the determined time-frequency resource units, each signal transmitted in one of the determined time-frequency resource units having a signal phase, the signal phase of each of the signals transmitted using the determined time-frequency resource units in said plurality of predetermined subsets of resource units, being the same.

34. The first device of claim 33, wherein the signal phase is generated from at least one of a first identifier of the first device, a second identifier of the second device, and an identifier of the peer-to-peer connection between the first and the second devices.

37. The method of claim 33, further comprising:

means for generating a plurality of power values as a function of a predetermined sequence, wherein the power of the transmitted signal in the determined one time-frequency resource unit in each of the plurality of predetermined subsets of resource units is equal to one of the generated plurality of power values.

35. A first device having a peer-to-peer connection with a second device to facilitate interference management of small packet transmissions within an ad hoc wireless network, comprising:

means for partitioning a set of resource units into a plurality of predetermined subsets of resource units;

means for determining one resource unit in each of the plurality of predetermined subsets of resource units as a function of a set of bits;

means for transmitting a signal in the determined one resource unit in each of the plurality of predetermined subsets of resource units; and

means for generating a plurality of phases as a function of a predetermined sequence, wherein a phase of the transmitted signal in the determined one resource unit in each of the plurality of predetermined subsets of resource units is equal to one of the generated plurality of phases.

36. The method of claim 35, wherein the predetermined sequence is generated from at least one of a first identifier of the first device, a second identifier of the second device, and an identifier of the peer-to-peer connection between the first and the second devices.

38. A non-transitory machine-readable medium comprising instructions for a first device having a peer-to-peer connection with a second device to facilitate interference management of small packet transmissions within an ad hoc wireless network, which when executed by a processor causes the processor to:

partition a set of resource units into a plurality of predetermined subsets of resource units, said resource units being time-frequency resource units, at least some of said time-frequency resource units corresponding to different tones;

determine one time-frequency resource unit in each of the plurality of predetermined subsets of resource units as a function of a set of bits; and

transmit signals using the determined time-frequency resource units, each signal transmitted in one of the determined time-frequency resource units having a signal phase, the signal phase of each of the signals transmitted using the determined time-frequency resource units in said plurality of predetermined subsets of resource units, being the same.

39. A non-transitory machine-readable medium comprising instructions for a first device having a peer-to-peer connection with a second device to facilitate interference management of small packet transmissions within an ad hoc wireless network, which when executed by a processor causes the processor to:

partition a set of resource units into a plurality of predetermined subsets of resource units;

determine one resource unit in each of the plurality of predetermined subsets of resource units as a function of a set of bits, said set of bits being generated from a set of information bits with an encoder;

transmit a signal in the determined one resource unit in each of the plurality of predetermined subsets of resource units; and

generate a plurality of phases as a function of a predetermined sequence, wherein a phase of the transmitted signal in the determined one resource unit in each of the plurality of predetermined subsets of resource units is equal to one of the generated plurality of phases.