RANDOM REUSE BASED CONTROL CHANNELS

• US 20090129268A1
• Filed: 06/27/2008
• Published: 05/21/2009
• Est. Priority Date: 11/16/2007
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Gorokhov, Alexei, Palanki, Ravi, Khandekar, Aamod, Lin, Dexu
• Granted Patent: US 8,761,032 B2
• Time in Patent Office: Days
• US Class Current: 370/231
• CPC Class Codes: H04L 1/0004 applied to control information
• CPC Class Codes: H04L 1/0072 Error control for data other than payload data, e.g. control data
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Systems and methodologies are described that facilitate wireless network transmitters blanking or reducing power on portions of bandwidth reserved for control information transmission. This mitigates interference from disparate transmitters. Furthermore, the control information portion can be divided into a plurality of OFDM tiles that are reusable by transmitters for transmitting the control information. In this regard, interference between transmitters is additionally mitigated as the transmitters can multiplex the control information over a plurality of tiles increasing the chance that at least a portion of the tiles are not interfered. The control information can be decoded by the receivers from the portion of tiles with a low probability of interference.

Claims

1. A method that facilitates communicating control information in wireless networks, comprising:

receiving control information transmitted over one or more tiles of a reserved control segment dedicated for transmitting the control information;

determining respective levels of interference for the one or more tiles; and

weighting the tiles for subsequent decoding based at least in part on the respective levels of interference.

2. The method of claim 1, at least one of the respective levels of interference is determined based at least in part on a pilot signal within a related tile of the one or more tiles.

3. The method of claim 1, further comprising determining the one or more tiles based at least in part on a random or pseudo-random function utilized by a transmitter.

4. The method of claim 3, the random or pseudo-random function is specific to the transmitter.

5. The method of claim 1, further comprising estimating a frequency response from the one or more tiles.

6. The method of claim 5, further comprising decoding the control information from the one or more tiles based at least in part on the frequency response.

7. The method of claim 5, the frequency response is estimated based at least in part on a subset of the one or more tiles with a level of interference less than a threshold interference.

8. The method of claim 1, the one or more tiles comprise one or more contiguous subcarriers of one or more contiguous OFDM symbols.

9. The method of claim 7, the control information is randomly multiplexed as one or more encoded modulation symbols over the one or more tiles.

14. The wireless communications apparatus of claim 9, the one or more control information tiles are randomly positioned in the reserved control segment.

15. The wireless communications apparatus of claim 14, the random positioning is specific to a transmitter of the one or more control information tiles.

16. The wireless communications apparatus of claim 14, the one or more control information tiles are contiguous in time or frequency over the reserved control segment.

10. A wireless communications apparatus, comprising:

at least one processor configured to determine a level of interference on one or more control information tiles received over a reserved control segment and weigh the control information tiles for subsequent decoding based at least in part on the level of interference; and

a memory coupled to the at least one processor.

11. The wireless communications apparatus of claim 10, the at least one processor further configured to estimate a control channel from the one or more control information tiles based at least in part on a pilot within the one or more control information tiles and decode control information from the control channel.

12. The wireless communications apparatus of claim 11, the one or more control information tiles comprise one or more tones over one or more OFDM symbols

13. The wireless communications apparatus of claim 12, the control information tiles are partially interfered by one or more disparate control information tiles received from a disparate device over at least a portion of the control information tiles.

17. A wireless communications apparatus that facilitates communicating control information in wireless networks, comprising:

means for determining respective levels of interference for one or more tiles received over a reserved control segment dedicated for transmitting control information; and

means for weighting the tiles for subsequent decoding based at least in part on the respective levels of interference.

18. The wireless communications apparatus of claim 17, at least one of the respective levels of interference is determined based at least in part on a pilot signal within a related tile of the one or more tiles.

19. The wireless communications apparatus of claim 17, further comprising means for determining the one or more tiles based at least in part on a random or pseudo-random function utilized by a transmitter.

20. The wireless communications apparatus of claim 19, the random or pseudo-random function is specific to the transmitter.

21. The wireless communications apparatus of claim 19, further comprising means for transmitting a control information transmission scheme to the transmitter, control information is multiplexed over the one or more tiles according to the scheme.

22. The wireless communications apparatus of claim 17, further comprising means for estimating one or more control channels from the one or more tiles, control information is decoded based at least in part on the estimated control channels.

23. A computer program product, comprising:

a computer-readable medium comprising;

code for causing at least one computer to receive control information transmitted over one or more tiles of a reserved control segment dedicated for transmitting the control information;

code for causing the at least one computer to determine respective levels of interference for the one or more tiles; and

code for causing the at least one computer to weigh the tiles for subsequent decoding based at least in part on the respective levels of interference.

24. The computer program product of claim 23, at least one of the respective levels of interference is determined based at least in part on a pilot signal within a related tile of the one or more tiles.

25. A wireless communication apparatus, comprising:

a processor configured to;

determine respective levels of interference for one or more tiles received over a reserved control segment dedicated for transmitting control information; and

weigh the tiles for subsequent decoding based at least in part on the respective levels of interference; and

a memory coupled to the processor.

26. A method for facilitating transmitting control information in wireless networks, comprising:

determining a subset of tiles of a communications bandwidth forming a reserved control segment dedicated for transmitting control information; and

transmitting control information over a portion of tiles of the reserved control segment.

27. The method of claim 26, the control information is multiplexed over the portion of tiles of the reserved control segment based at least in part on a random or pseudo-random sequence.

28. The method of claim 27, the random or pseudo-random sequence is transmitter specific.

29. The method of claim 27, the random or pseudo-random sequence is sector specific.

30. The method of claim 29, further comprising transmitting the control information over the portion of tiles of the reserved control segment.

31. The method of claim 26, the portion of tiles of the reserved control segment comprise pilot information to facilitate interference determination.

32. A wireless communications apparatus, comprising:

at least one processor configured to transmit control information over one or more tiles that are part of a reserved control segment of tiles dedicated for transmitting control information; and

a memory coupled to the at least one processor.

33. The wireless communications apparatus of claim 32, the at least one processor further configured to select the one or more tiles based at least in part on a random or pseudo-random sequence.

34. The wireless communications apparatus of claim 33, the sequence is specific to the wireless communications apparatus.

35. The wireless communications apparatus of claim 33, the sequence is selected based at least in part on a predetermined configuration for minimizing wireless communication apparatus interference over the reserved control segment.

36. The wireless communications apparatus of claim 32, the one or more tiles additionally comprises pilot information.

37. A wireless communications apparatus for transmitting control information in wireless networks, comprising:

means for reserving a subset of tiles of a communications bandwidth related to a reserved control segment dedicated for transmitting control information;

means for selecting a portion of the subset of tiles over which to transmit control information; and

means for transmitting control information over the portion of the subset of tiles.

38. The wireless communications apparatus of claim 37, further comprising means for applying an error control code to the control information.

39. The wireless communications apparatus of claim 37, further comprising means for multiplexing the control information over the portion of tiles with a pilot.

40. The wireless communications apparatus of claim 39, the control information is modulated according to a random sequence specific to the wireless communications apparatus.

41. The wireless communications apparatus of claim 37, the reserved control segment is dedicated for transmitting control information by a plurality of disparate wireless communications apparatuses.

42. A computer program product, comprising:

a computer-readable medium comprising;

code for causing at least one computer to determine a subset of tiles of a communications bandwidth forming a reserved control segment dedicated for transmitting control information; and

code for causing the at least one computer to transmit control information over a portion of tiles of the reserved control segment.

43. The computer program product of claim 42, the control information is multiplexed over the portion of tiles of the reserved control segment based at least in part on a random or pseudo-random sequence.

44. A wireless communication apparatus, comprising:

a processor configured to;

reserve a subset of tiles of a communications bandwidth related to a reserved control segment reserved for transmitting control information; and

transmit control information over a portion of tiles of the reserved control segment; and

a memory coupled to the processor.