Enhanced uplink rate indicator

• US 20070076807A1
• Filed: 07/14/2006
• Published: 04/05/2007
• Est. Priority Date: 07/20/2005
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Laroia, Rajiv, Li, Junyi, Jin, Hui, Richardson, Tom
• Granted Patent: US 8,315,240 B2
• Time in Patent Office: Days
• US Class Current: 375/260
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/1854 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 27/2601 Multicarrier modulation systems
• CPC Class Codes: H04L 5/023 Multiplexing of multicarrier modulation signals multicarrier modulation H04L27/2601
• CPC Class Codes: H04L 5/04 the signals being represented by different amplitudes or polarities, e.g. quadriplex
• CPC Class Codes: H04W 52/04 TPC
• CPC Class Codes: H04W 52/346 distributing total power among users or channels

Abstract

The claimed subject matter relates to providing uplink data rate option information in an uplink traffic channel segment. A wireless terminal may indicate a data rate option being used for the segment via an energy pattern applied to the tone-symbols of the segment. To indicate a first data rate option, additional energy may be applied to a first set of tone-symbols of the segment. To indicate a second rate option, additional energy may be applied to a second set of tone-symbols of the segment, the second set being different from the first set. According to some aspects, each implemented energy pattern may be represented by a pattern, which has a slope (e.g., in a logical, pre-hopped representation of the channel segment), where some of the patterns have positive slope and some of the patterns have negative slope. The use of positive and negative slopes facilitates the representation of more data rate options than would be possible if only one type of slope (positive or negative) for the energy pattern were utilized.

Claims

1. A method of indicating an uplink data rate for a first transmission segment in an OFDM wireless communication environment, comprising:

determining a first rate option to be used in the first segment;

encoding information bits to coded bits and mapping coded bits to modulation symbols in accordance with the first rate option;

identifying a first and a second predetermined subsets of the tone-symbols in the first segment as a function of the first rate option, wherein a tone-symbol is a tone in an OFDM symbol period and tones are indexed in a logical order;

mapping the modulation symbols to the tone-symbols of the first segment;

power-scaling a modulation symbol mapped to a tone-symbol of the first subset with a first parameter;

power-scaling a modulation symbol mapped to a tone-symbol of the second subset with a second parameter, the second parameter being different from the first parameter; and

transmitting the first segment.

2. The method of claim 1, further comprising modulating a modulation symbol mapped to a tone-symbol to a physical frequency in accordance with a logical tone index of the tone-symbol and a logical-to-physical tone mapping function.

3. The method of claim 1, wherein the ratio of the second parameter and the first parameter is a predetermined number.

4. The method of claim 3, wherein the predetermined number is a constant in the range of 1 dB and 3 dB.

5. The method of claim 3, wherein the predetermined number is a function of the first rate option and in the range of 1 dB and 3 dB.

6. The method of claim 5, wherein the ratio is between approximately 2.0 dB and approximately 3.0 dB when the first rate option corresponds to a QPSK modulation scheme, and the ratio is between approximately 1.5 dB and approximately 2.5 dB when the first rate option corresponds to a 16-point QAM modulation scheme

7. The method of claim 3, wherein the number of tone-symbols in the second subset is a constant in any OFDM symbols.

8. The method of claim 7, wherein the tone-symbols in the second subset has a sloped pattern in the segment.

9. The method of claim 8, further comprising:

determining a second rate option to be used in a second segment;

encoding information bits to coded bits and mapping coded bits to modulation symbols in accordance with the second rate option;

identifying a third and a fourth predetermined subsets of the tone-symbols in the second segment as a function of the second rate option, wherein a tone-symbol is a tone in an OFDM symbol period and tones are indexed in a logical order and the tone-symbols in the fourth subset has a sloped pattern in the segment;

mapping the modulation symbols to the tone-symbols of the second segment;

power scaling a modulation symbol mapped to a tone-symbol of the third subset with a third parameter;

power scaling a modulation symbol mapped to a tone-symbol of the fourth subset with a fourth parameter, the fourth parameter being different from the third parameter, wherein the ratio of the fourth parameter to the third parameter is a fixed number; and

transmitting the second segment.

10. The method of claim 9, wherein the slope of the second subset is the same as the slope of the fourth subset, and the second and the fourth subsets have different shifts.

11. The method of claim 9, wherein the slope of the second subset is different from the slope of the fourth subset.

12. An apparatus that facilitates indicating an uplink data rate for transmission segments in an OFDM wireless communication environment, comprising:

a processor that determines a first rate option to be used in a first segment, and identifies a first and a second predetermined subset of the tone-symbols in the first segment as a function of the first rate option, wherein a tone-symbol is a tone in an OFDM symbol period and tones are indexed in a logical order;

an encoder that encodes information bits to coded bits, maps coded bits to modulation symbols in accordance with the first rate option, and maps the modulation symbols to the tone-symbols of the first segment; and

a transmitter that power-scales a modulation symbol mapped to a tone-symbol of the first subset with a first parameter, power-scales a modulation symbol mapped to a tone-symbol of the second subset with a second parameter, the second parameter being different from the first parameter, and transmits the first segment.

13. The apparatus of claim 12, wherein the encoder modulates a modulation symbol mapped to a tone-symbol to a physical frequency in accordance with a logical tone index of the tone-symbol and a logical-to-physical tone mapping function.

14. The apparatus of claim 12, wherein the ratio of the second parameter and the first parameter is a predetermined number.

15. The apparatus of claim 14, wherein the predetermined number is a constant in the range of 1 dB and 3 dB.

16. The apparatus of claim 14, wherein the predetermined number is a function of the first rate option and in the range of 1 dB and 3 dB.

17. The apparatus of claim 16, wherein the ratio is between approximately 2.0 dB and approximately 3.0 dB when the first rate option corresponds to a QPSK modulation scheme, and the ratio is between approximately 1.5 dB and approximately 2.5 dB when the first rate option corresponds to a 16-point QAM modulation scheme.

18. The apparatus of claim 14, wherein the number of tone-symbols in the second subset is a constant in any OFDM symbols.

19. The apparatus of claim 18, wherein the tone-symbols in the second subset have a sloped pattern in the segment.

20. The apparatus of claim 19, wherein:

the processor determines a second rate option to be used in a second segment, and identifies third and fourth predetermined subsets of the tone-symbols in the second segment as a function of the second rate option, wherein a tone-symbol is a tone in an OFDM symbol period, tones are indexed in a logical order and the tone-symbols in the fourth subset has a sloped pattern in the segment;

the encoder encodes information bits to coded bits, maps coded bits to modulation symbols in accordance with the second rate option, and maps the modulation symbols to the tone-symbols of the second segment;

the transmitter power-scales a modulation symbol mapped to a tone-symbol of the third subset with a third parameter, power-scales a modulation symbol mapped to a tone-symbol of the fourth subset with a fourth parameter, the fourth parameter being different from the third parameter, wherein the ratio of the fourth parameter to the third parameter is a fixed number, and transmits the second segment.

21. The apparatus of claim 20, wherein the slope of the second subset is the same as the slope of the fourth subset, and the second and the fourth subsets have different shifts.

22. The apparatus of claim 20, wherein the slope of the second subset is different from the slope of the fourth subset.

23. An apparatus that facilitates indicating an uplink data rate for transmission segments in an OFDM wireless communication environment, comprising:

means for determining a rate option to be used in the first segment;

means for encoding information bits to coded bits and mapping coded bits to modulation symbols in accordance with the first rate option;

means for identifying a first and a second predetermined subsets of the tone-symbols in the first segment as a function of the first rate option, wherein a tone-symbol is a tone in an OFDM symbol period and tones are indexed in a logical order;

means for mapping the modulation symbols to the tone-symbols of the first segment;

means for power-scaling a modulation symbol mapped to a tone-symbol of the first subset with a first parameter;

means for power-scaling a modulation symbol mapped to a tone-symbol of the second subset with a second parameter, the second parameter being different from the first parameter; and

means for transmitting the first segment.

24. The apparatus of claim 23, further comprising modulating a modulation symbol mapped to a tone-symbol to a physical frequency in accordance with a logical tone index of the tone-symbol and a logical-to-physical tone mapping function.

25. The apparatus of claim 23, wherein the ratio of the second parameter and the first parameter is a predetermined number.

26. The apparatus of claim 25, wherein the predetermined number is a constant in the range of 1 dB and 3 dB.

27. The apparatus of claim 25, wherein the predetermined number is a function of the first rate option and in the range of 1 dB and 3 dB.

28. The apparatus of claim 27, wherein the ratio is between approximately 2.0 dB and approximately 3.0 dB when the first rate option corresponds to a QPSK modulation scheme, and the ratio is between approximately 1.5 dB and approximately 2.5 dB when the first rate option corresponds to a 16-point QAM modulation scheme

29. The apparatus of claim 25, wherein the number of tone-symbols in the second subset is a constant in any OFDM symbols.

30. The apparatus of claim 29, wherein the tone-symbols in the second subset has a sloped pattern in the segment.

31. The apparatus of claim 30, further comprising:

means for determining a second rate option to be used in a second segment;

means for encoding information bits to coded bits and mapping coded bits to modulation symbols in accordance with the second rate option;

means for identifying a third and a fourth predetermined subsets of the tone-symbols in the second segment as a function of the second rate option, wherein a tone-symbol is a tone in an OFDM symbol period and tones are indexed in a logical order and the tone-symbols in the fourth subset has a sloped pattern in the segment;

means for mapping the modulation symbols to the tone-symbols of the second segment;

means for power scaling a modulation symbol mapped to a tone-symbol of the third subset with a third parameter;

means for power scaling a modulation symbol mapped to a tone-symbol of the fourth subset with a fourth parameter, the fourth parameter being different from the third parameter, wherein the ratio of the fourth parameter to the third parameter is a fixed number; and

means for transmitting the second segment.

32. The apparatus of claim 31, wherein the slope of the second subset is the same as the slope of the fourth subset, and the second and the fourth subsets have different shifts.

33. The apparatus of claim 31, wherein the slope of the second subset is different from the slope of the fourth subset.

34. A computer-readable medium having stored thereon computer-readable instructions for:

determining a first rate option to be used in the first segment;

encoding information bits to coded bits and mapping coded bits to modulation symbols in accordance with the first rate option;

identifying a first and a second predetermined subsets of the tone-symbols in the first segment as a function of the first rate option, wherein a tone-symbol is a tone in an OFDM symbol period and tones are indexed in a logical order;

mapping the modulation symbols to the tone-symbols of the first segment;

power-scaling a modulation symbol mapped to a tone-symbol of the first subset with a first parameter;

power-scaling a modulation symbol mapped to a tone-symbol of the second subset with a second parameter, the second parameter being different from the first parameter; and

transmitting the first segment.

35. The computer-readable medium of claim 34, further comprising instructions for modulating a modulation symbol mapped to a tone-symbol to a physical frequency in accordance with a logical tone index of the tone-symbol and a logical-to-physical tone mapping function.

36. The computer-readable medium of claim 34, wherein the ratio of the second parameter and the first parameter is a predetermined number.

37. The computer-readable medium of claim 36, wherein the predetermined number is a constant in the range of 1 dB and 3 dB.

38. The computer-readable medium of claim 36, wherein the predetermined number is a function of the first rate option and in the range of 1 dB and 3 dB.

39. The computer-readable medium of claim 38, wherein the ratio is between approximately 2.0 dB and approximately 3.0 dB when the first rate option corresponds to a QPSK modulation scheme, and the ratio is between approximately 1.5 dB and approximately 2.5 dB when the first rate option corresponds to a 16-point QAM modulation scheme

40. The computer-readable medium of claim 36, wherein the number of tone-symbols in the second subset is a constant in any OFDM symbols.

41. The computer-readable medium of claim 40, wherein the tone-symbols in the second subset has a sloped pattern in the segment.

42. The computer-readable medium of claim 41, further comprising instructions for:

determining a second rate option to be used in a second segment;

encoding information bits to coded bits and mapping coded bits to modulation symbols in accordance with the second rate option;

identifying a third and a fourth predetermined subsets of the tone-symbols in the second segment as a function of the second rate option, wherein a tone-symbol is a tone in an OFDM symbol period and tones are indexed in a logical order and the tone-symbols in the fourth subset has a sloped pattern in the segment;

mapping the modulation symbols to the tone-symbols of the second segment;

power scaling a modulation symbol mapped to a tone-symbol of the third subset with a third parameter;

power scaling a modulation symbol mapped to a tone-symbol of the fourth subset with a fourth parameter, the fourth parameter being different from the third parameter, wherein the ratio of the fourth parameter to the third parameter is a fixed number; and

transmitting the second segment.

43. The computer-readable medium of claim 42, wherein the slope of the second subset is the same as the slope of the fourth subset, and the second and the fourth subsets have different shifts.

44. The computer-readable medium of claim 42, wherein the slope of the second subset is different from the slope of the fourth subset.

45. A processor that executes computer-executable instructions for indicating an uplink data rate for transmission segments in an OFDM wireless communication environment, the instructions comprising:

determining a first rate option to be used in the first segment;

encoding information bits to coded bits and mapping coded bits to modulation symbols in accordance with the first rate option;

identifying a first and a second predetermined subsets of the tone-symbols in the first segment as a function of the first rate option, wherein a tone-symbol is a tone in an OFDM symbol period and tones are indexed in a logical order;

mapping the modulation symbols to the tone-symbols of the first segment;

power-scaling a modulation symbol mapped to a tone-symbol of the first subset with a first parameter;

power-scaling a modulation symbol mapped to a tone-symbol of the second subset with a second parameter, the second parameter being different from the first parameter; and

transmitting the first segment.

46. The processor of claim 45, the instructions further comprising modulating a modulation symbol mapped to a tone-symbol to a physical frequency in accordance with a logical tone index of the tone-symbol and a logical-to-physical tone mapping function.

47. The processor of claim 45, wherein the ratio of the second parameter and the first parameter is a predetermined number.

48. The processor of claim 47, wherein the predetermined number is a constant in the range of 1 dB and 3 dB.

49. The processor of claim 47, wherein the predetermined number is a function of the first rate option and in the range of 1 dB and 3 dB.

50. The processor of claim 49, wherein the ratio is between approximately 2.0 dB and approximately 3.0 dB when the first rate option corresponds to a QPSK modulation scheme, and the ratio is between approximately 1.5 dB and approximately 2.5 dB when the first rate option corresponds to a 16-point QAM modulation scheme

51. The processor of claim 47, wherein the number of tone-symbols in the second subset is a constant in any OFDM symbols.

52. The processor of claim 51, wherein the tone-symbols in the second subset has a sloped pattern in the segment.

53. The processor of claim 52, the instructions further comprising:

determining a second rate option to be used in a second segment;

encoding information bits to coded bits and mapping coded bits to modulation symbols in accordance with the second rate option;

identifying a third and a fourth predetermined subsets of the tone-symbols in the second segment as a function of the second rate option, wherein a tone-symbol is a tone in an OFDM symbol period and tones are indexed in a logical order and the tone-symbols in the fourth subset has a sloped pattern in the segment;

mapping the modulation symbols to the tone-symbols of the second segment;

power scaling a modulation symbol mapped to a tone-symbol of the third subset with a third parameter;

power scaling a modulation symbol mapped to a tone-symbol of the fourth subset with a fourth parameter, the fourth parameter being different from the third parameter, wherein the ratio of the fourth parameter to the third parameter is a fixed number; and

transmitting the second segment.

54. The processor of claim 53, wherein the slope of the second subset is the same as the slope of the fourth subset, and the second and the fourth subsets have different shifts.

55. The processor of claim 53, wherein the slope of the second subset is different from the slope of the fourth subset.