Methods and apparatus for communicating control information

• US 9,137,072 B2
• Filed: 07/14/2006
• Issued: 09/15/2015
• Est. Priority Date: 12/22/2005
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Richardson, Tom, Jin, Hui, Li, Junyi, Parizhisky, Vladimir
• Primary Examiner(s): PHU, SANH D
• Application Number:
  US11/486,895
• Publication Number:
  US 20070149137A1
• Time in Patent Office: 3,350 Days
• Field of Search: 455/68, 455/67.11, 455/450, 455/509, 455/515, 370/230, 370/328, 370/498
• US Class Current: 1/1
• CPC Class Codes: H04L 1/0004 applied to control information
• CPC Class Codes: H04L 27/2602 Signal structure
• CPC Class Codes: H04L 27/2627 Modulators
• CPC Class Codes: H04W 28/18 Negotiating wireless communication parameters
• CPC Class Codes: H04W 52/08 Closed loop power control
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network

Abstract

In a first mode of dedicated control channel (DCCH) operation, a wireless terminal is allocated more segments than in a second mode. The wireless terminal uses different information bit to modulation symbol mapping in the different modes. On a per DCCH segment basis, the same number of modulation symbols are communicated in either mode but more information bits are conveyed in the second mode. Information bits for a DCCH segment are partitioned into two subsets. The two subsets are used to generate another set, each of the two subsets and the another set are input to the same mapping function to generate three equal size sets of modulation symbols which are transmitted via the DCCH segment. Uplink tone hopping is used such that one of the equal size sets of modulation symbols for the DCCH segment uses the same tone but a different set uses a different tone.

Claims

1. A method of operating a wireless terminal, comprising:

determining modulation symbols to be transmitted in accordance with a first information-bit-to-modulation-symbol mapping procedure when in a first mode of control channel operation; and

determining modulation symbols to be transmitted in accordance with a second information-bit-to-modulation-symbol mapping procedure when in a second mode of control channel operation during which said wireless terminal has a different amount of control channel resources than said wireless terminal has during said first mode of control channel operation.

2. The method of claim 1,

wherein said modulation symbols are modulation symbols transmitted on individual tones;

wherein a single antenna is used by said wireless terminal during said first and second modes of control channel operation for signal transmissions; and

wherein the same antenna is used during both the first and second modes of control channel operation.

3. The method of claim 1,

wherein said control channel resources are control channel transmission segments, each transmission segment corresponding to multiple symbol transmission time periods;

and

wherein during said first control channel mode of operation said wireless terminal is dedicated, on average, an integer multiple of the number of control channel segments dedicated to said wireless terminal during said second control channel mode of operation.

4. The method of claim 1, where said first control channel mode of operation is a mode of operation in which said wireless terminal is dedicated a single logical tone of a control channel.

6. The method of claim 4, wherein said second control channel mode of operation is a split tone mode of operation in which said wireless terminal is dedicated a single logical tone of a control channel on a time shared basis, said dedicated logical tone being used in a time shared manner to the exclusion of at least one other wireless terminal which is dedicated said logical tone for periods of time which do not overlap the periods of time in which said logical tone are dedicated to said wireless terminal.

7. The method of claim 1,

wherein determining modulation symbols to be transmitted in accordance with a first information-bit-to-modulation-symbol mapping procedure when in a first mode of control channel operation includes:

generating X modulation symbols from M information bits where X is a positive integer greater than M; and

wherein determining modulation symbols to be transmitted in accordance with a second information-bit-to-modulation-symbol mapping procedure when in a second mode of control channel operation includes;

generating X modulation symbols from N information bits where X is a positive integer greater than N, and wherein N is greater than M.

10. The method of claim 7, further comprising during both said first and second modes of operation,

transmitting X generated modulation symbols in individual control channel segments, the control channel segments used during both said first and second modes of operation being the same size.

11. The method of claim 7, wherein generating X modulation symbols from M information bits during said first mode of operation includes:

partitioning said M information bits into first and second subsets of information bits of equal size; and

generating a third set of bits as a function of said first and second subsets of bits, said third set of bits being the same size as said first and second subsets of bits.

12. The method of claim 11, wherein said function includes performing a bit wise exclusive OR operation.

13. The method of claim 11, wherein generating X modulation symbols from M information bits during said first mode of operation further includes:

determining, for each of said first subset of information bits, second subset of information bits and third set of bits, using a first mapping function, an equal number of said X modulation symbols, the first mapping function used to determine each of said equal number of X modulation symbols being the same.

14. The method of claim 13,

wherein said first control channel mode of operation is a mode of operation in which said wireless terminal is dedicated a single logical tone of a control channel,

wherein said single logical tone is tone hopped according to a tone hopping schedule but remains the same for each period of time used to transmit one of said equal numbers of said X modulation symbols.

15. The method of claim 11, wherein generating X modulation symbols from N information bits during said second mode of operation includes:

partitioning said N information bits into fourth and fifth subsets of information bits of equal size; and

generating a sixth set of bits as a function of said fourth and fifth subsets of bits, said sixth set of bits being the same size as said fourth and fifth subsets of bits.

16. The method of claim 15, wherein generating X modulation symbols from N information bits during said second mode of operation further includes:

determining, for each of said fourth subset of information bits, fifth subset of information bits and sixth set of bits, using a second mapping function, an equal number of said X modulation symbols, the second mapping function used to determine each of said equal number of X modulation symbols being the same.

5. A method of operating a wireless terminal, comprising:

determining modulation symbols to be transmitted in accordance with a first information-bit-to-modulation-symbol mapping procedure when in a first mode of control channel operation;

determining modulation symbols to be transmitted in accordance with a second information-bit-to-modulation-symbol mapping procedure when in a second mode of control channel operation;

wherein said first and second modes of operation are first and second control channel modes of operation, respectively;

wherein said first control channel mode of operation is a mode of operation in which said wireless terminal is dedicated a single logical tone of a control channel; and

wherein said single logical tone is tone hopped according to a tone hopping schedule.

8. A method of operating a wireless terminal, comprising:

determining modulation symbols to be transmitted in accordance with a first information-bit-to-modulation-symbol mapping procedure when in a first mode of control channel operation;

determining modulation symbols to be transmitted in accordance with a second information-bit-to-modulation-symbol mapping procedure when in a second mode of control channel operation;

wherein determining modulation symbols to be transmitted in accordance with a first information-bit-to-modulation-symbol mapping procedure when in a first mode of control channel operation includes;

generating X modulation symbols from M information bits where X is a positive integer greater than M;

wherein determining modulation symbols to be transmitted in accordance with a second information-bit-to-modulation-symbol mapping procedure when in a second mode of control channel operation includes;

generating X modulation symbols from N information bits where X is a positive integer greater than N, and wherein N is greater than M; and

wherein X is a multiple of three and M and N are even positive integers.

9. The method of claim 8 wherein, X is 21, M is 6 and N is 8.

17. A wireless terminal, comprising:

a modulation symbol determination module for determining modulation symbols to be transmitted in accordance with a first information-bit-to-modulation-symbol mapping procedure when in a first mode of control channel operation and for determining modulation symbols to be transmitted in accordance with a second information-bit-to-modulation-symbol mapping procedure when in a second mode of control channel operation during which said wireless terminal has a different amount of control channel resources than said wireless terminal has during said first mode of control channel operation; and

a transmission module for transmitting modulation symbols determined by said modulation symbol determination module.

18. The wireless terminal of claim 17, wherein said transmitter is an OFDM transmitter which transmits each of said modulation symbols on a single tone.

19. The wireless terminal of claim 17, wherein said control channel resources are control channel transmission segments, each transmission segment corresponding to multiple symbol transmission time periods;

wherein during said first control channel mode of operation said wireless terminal is dedicated, on average, an integer multiple of the number of control channel segments dedicated to said wireless terminal during said second control channel mode of operation, the wireless terminal further comprising;

a mode control module for determining which one of said first and second modes of operation to operate in based on at least one signal received from a base station.

20. The wireless terminal of claim 19, wherein said first control channel mode of operation is a mode of operation in which said wireless terminal is dedicated a single logical tone of a control channel.

21. The wireless terminal of claim 20, further comprising:

a tone hopping module for determining, according to a tone hopping function, at different points in time, a physical tone corresponding to said single logical tone.

22. The wireless terminal of claim 20, wherein said second control channel mode of operation is a split tone mode of operation in which said wireless terminal is dedicated a single logical tone of a control channel on a time shared basis, said dedicated logical tone being used in a time shared manner to the exclusion of at least one other wireless terminal which is dedicated said logical tone for periods of time which do not overlap the periods of time in which said logical tone are dedicated to said wireless terminal.

23. The wireless terminal of claim 17,

wherein said modulation symbol determination module includes a first mode modulation symbol determination module for determining modulation symbols to be transmitted in accordance with the first information-bit-to-modulation-symbol mapping procedure which generates X modulation symbols from M information bits where X is a positive integer greater than M;

and

wherein said modulation symbol determination module includes a second mode modulation symbol determination module for determining modulation symbols to be transmitted in accordance with the second information-bit-to-modulation-symbol mapping procedure which generates X modulation symbols from N information bits where X is a positive integer greater than N, and wherein N is greater than M.

25. The wireless terminal of claim 23, further comprising:

a modulation symbol to transmission segment mapping module, for assigning each set of X generated modulation symbols to a control channel segment, the control channel segments used during both said first and second modes of operation being the same size.

26. The wireless terminal of claim 23, wherein the first mode modulation symbol determination module includes:

a first partitioning module for partitioning said M information bits into first and second subsets of information bits of equal size; and

a third set of bits generation module for generating a third set of bits as a function of said first and second subsets of bits, said third set of bits being the same size as said first and second subsets of bits.

27. The wireless terminal of claim 26, wherein said third set of bits generation module includes a bit wise exclusive OR operator for generating said third set of bits.

28. The wireless terminal of claim 26, wherein the first mode modulation symbol determination module further includes:

a first mapping function module for determining, for each of said first subset of information bits, second subset of information bits and third set of bits, using a first mapping function, an equal number of said X modulation symbols, the first mapping function used to determine each of said equal number of X modulation symbols being the same.

29. The wireless terminal of claim 28, wherein the second mode modulation symbol determination module includes:

a second module for partitioning said N information bits into fourth and fifth subsets of information bits of equal size; and

a sixth set of bits generation module for generating a sixth set of bits as a function of said fourth and fifth subsets of bits, said sixth set of bits being the same size as said fourth and fifth subsets of bits.

30. The wireless terminal of claim 29, wherein the second mode modulation symbol determination module further includes:

a second mapping function module for determining, for each of said fourth subset of information bits, fifth subset of information bits and sixth set of bits, using a second mapping function, an equal number of said X modulation symbols, the second mapping function used to determine each of said equal number of X modulation symbols being the same.

24. A wireless terminal, comprising:

a modulation symbol determination module for determining modulation symbols to be transmitted in accordance with a first information-bit-to-modulation-symbol mapping procedure when in a first mode of control channel operation and for determining modulation symbols to be transmitted in accordance with a second information-bit-to-modulation-symbol mapping procedure when in a second mode of control channel operation;

a transmission module for transmitting modulation symbols determined by said modulation symbol determination module;

wherein said modulation symbol determination module includes a first mode modulation symbol determination module for determining modulation symbols to be transmitted in accordance with the first information-bit-to-modulation-symbol mapping procedure which generates X modulation symbols from M information bits where X is a positive integer greater than M;

wherein said modulation symbol determination module includes a second mode modulation symbol determination module for determining modulation symbols to be transmitted in accordance with the second information-bit-to-modulation-symbol mapping procedure which generates X modulation symbols from N information bits where X is a positive integer greater than N, and wherein N is greater than M; and

wherein X is a multiple of three and M and N are even positive integers.

31. A wireless terminal, comprising:

means for determining modulation symbols to be transmitted in accordance with a first information-bit-to-modulation-symbol mapping procedure when in a first mode of control channel operation and for determining modulation symbols to be transmitted in accordance with a second information-bit-to-modulation-symbol mapping procedure when in a second mode of control channel operation during which said wireless terminal has a different amount of control channel resources than said wireless terminal has during said first mode of control channel operation; and

means for transmitting modulation symbols determined by said means for determining modulation symbols to be transmitted.

32. The wireless terminal of claim 31, wherein said means for transmitting is an OFDM transmitter which transmits each of said modulation symbols on a single tone.

33. The wireless terminal of claim 31, wherein said control channel resources are control channel transmission segments, each transmission segment corresponding to multiple symbol transmission time periods;

and

wherein during said first control channel mode of operation said wireless terminal is dedicated an integer multiple of the number of control channel segments dedicated, on average, to said wireless terminal during said second control channel mode of operation, the wireless terminal further comprising;

means for determining which one of said first and second modes of operation to operate in based on at least one signal received from a base station.

34. The wireless terminal of claim 33, wherein said first control channel mode of operation is a mode of operation in which said wireless terminal is dedicated a single logical tone of a control channel.

35. The wireless terminal of claim 34, further comprising:

means for determining, according to a tone hopping function, at different points in time, a physical tone corresponding to said single logical tone.

36. The wireless terminal of claim 34, wherein said second control channel mode of operation is a split tone mode of operation in which said wireless terminal is dedicated a single logical tone of a control channel on a time shared basis, said dedicated logical tone being used in a time shared manner to the exclusion of at least one other wireless terminal which is dedicated said logical tone for periods of time which do not overlap the periods of time in which said logical tone are dedicated to said wireless terminal.

37. The wireless terminal of claim 31,

wherein said means for determining modulation symbols includes means for determining modulation symbols to be transmitted in accordance with the first information-bit-to-modulation-symbol mapping procedure which generates X modulation symbols from M information bits where X is a positive integer greater than M;

and

wherein said means for determining modulation symbols includes means for determining modulation symbols to be transmitted in accordance with the second information-bit-to-modulation-symbol mapping procedure which generates X modulation symbols from N information bits where X is a positive integer greater than N, and wherein N is greater than M.

39. The wireless terminal of claim 37, further comprising:

means for mapping modulation symbols to a transmission segment for assigning each set of X generated modulation symbols to a control channel segment, the control channel segments used during both said first and second modes of operation being the same size.

38. A wireless terminal, comprising:

means for determining modulation symbols to be transmitted in accordance with a first information-bit-to-modulation-symbol mapping procedure when in a first mode of control channel operation and for determining modulation symbols to be transmitted in accordance with a second information-bit-to-modulation-symbol mapping procedure when in a second mode of control channel operation;

means for transmitting modulation symbols determined by said modulation symbol determination module;

wherein said means for determining modulation symbols includes means for determining modulation symbols to be transmitted in accordance with the first information-bit-to-modulation-symbol mapping procedure which generates X modulation symbols from M information bits where X is a positive integer greater than M;

wherein said means for determining modulation symbols includes means for determining modulation symbols to be transmitted in accordance with the second information-bit-to-modulation-symbol mapping procedure which generates X modulation symbols from N information bits where X is a positive integer greater than N, and wherein N is greater than M; and

wherein X is a multiple of three and M and N are even positive integers.

40. A wireless terminal, comprising:

means for determining modulation symbols to be transmitted in accordance with a first information-bit-to-modulation-symbol mapping procedure when in a first mode of control channel operation and for determining modulation symbols to be transmitted in accordance with a second information-bit-to-modulation-symbol mapping procedure when in a second mode of control channel operation; and

means for transmitting modulation symbols determined by said means for determining modulation symbols to be transmitted;

wherein said means for determining modulation symbols includes means for determining modulation symbols to be transmitted in accordance with the first information-bit-to-modulation-symbol mapping procedure which generates X modulation symbols from M information bits where X is a positive integer greater than M; and

wherein said means for determining modulation symbols includes means for determining modulation symbols to be transmitted in accordance with the second information-bit-to-modulation-symbol mapping procedure which generates X modulation symbols from N information bits where X is a positive integer greater than N, and wherein N is greater than M;

wherein the means for determining modulation symbols to be transmitted in accordance with a first information-bit-to-modulation-symbol mapping procedure includes;

means for partitioning said M information bits into first and second subsets of information bits of equal size; and

means for generating a third set of bits as a function of said first and second subsets of bits, said third set of bits being the same size as said first and second subsets of bits.

41. The wireless terminal of claim 40, wherein said means for generating a third set of bits includes a bit wise exclusive OR operator for generating said third set of bits.

42. The wireless terminal of claim 40, wherein the means for determining modulation symbols to be transmitted in accordance with a first information-bit-to-modulation-symbol mapping procedure further includes:

means for determining, for each of said first subset of information bits, second subset of information bits and third set of bits, using a first mapping function, an equal number of said X modulation symbols, the first mapping function used to determine each of said equal number of X modulation symbols being the same.

43. The wireless terminal of claim 42, wherein the means for determining modulation symbols to be transmitted in accordance with a second information-bit-to-modulation-symbol mapping procedure includes:

means for partitioning said N information bits into fourth and fifth subsets of information bits of equal size; and

means for generating a sixth set of bits as a function of said fourth and fifth subsets of bits, said sixth set of bits being the same size as said fourth and fifth subsets of bits.

44. The wireless terminal of claim 43, wherein the means for determining modulation symbols to be transmitted in accordance with a second information-bit-to-modulation-symbol mapping procedure further includes:

means for determining, for each of said fourth subset of information bits, fifth subset of information bits and sixth set of bits, using a second mapping function, an equal number of said X modulation symbols, the second mapping function used to determine each of said equal number of X modulation symbols being the same.

45. A non-transitory computer readable medium embodying computer executable instructions for controlling a wireless terminal, the computer readable medium comprising:

instructions for causing said wireless terminal to determine modulation symbols to be transmitted in accordance with a first information-bit-to-modulation-symbol mapping procedure when in a first mode of control channel operation; and

instructions for causing said wireless terminal to determine modulation symbols to be transmitted in accordance with a second information-bit-to-modulation-symbol mapping procedure when in a second mode of control channel operation during which said wireless terminal has a different amount of control channel resources than said wireless terminal has during said first mode of control channel operation.

46. The computer readable medium of claim 45, wherein said modulation symbols are modulation symbols transmitted on individual tones.

47. The computer readable medium of claim 45, wherein said control channel resources are control channel transmission segments, each transmission segment corresponding to multiple symbol transmission time periods;

and

wherein during said first control channel mode of operation said wireless terminal is dedicated an integer multiple of the number of control channel segments dedicated to said wireless terminal during said second control channel mode of operation.

48. The computer readable medium of claim 47, where said first control channel mode of operation is a mode of operation in which said wireless terminal is dedicated a single logical tone of a control channel.

49. The computer readable medium of claim 48, wherein said single logical tone is tone hopped according to a tone hopping schedule.

50. The computer readable medium of claim 48, wherein said second control channel mode of operation is a split tone mode of operation in which said wireless terminal is dedicated a single logical tone of a control channel on a time shared basis, said dedicated logical tone being used in a time shared manner to the exclusion of at least one other wireless terminal which is dedicated said logical tone for periods of time which do not overlap the periods of time in which said logical tone are dedicated to said wireless terminal.

51. The computer readable medium of claim 45, further comprising:

instructions for causing said wireless terminal to generate X modulation symbols from M information bits, where X is a positive integer greater than M, as part of determining modulation symbols to be transmitted in accordance with the first information bit to modulation symbol mapping procedure when in a first mode of control channel operation; and

instructions for causing said wireless terminal to generate X modulation symbols from N information bits, where X is a positive integer greater than N, and wherein N is greater than M, as part of determining modulation symbols to be transmitted in accordance with the second information bit to modulation symbol mapping procedure when in a second mode of control channel operation.

52. An apparatus operable in a communication system, the apparatus comprising:

a processor configured to;

determine modulation symbols to be transmitted in accordance with a first information-bit-to-modulation-symbol mapping procedure when in a first mode of control channel operation; and

determine modulation symbols to be transmitted in accordance with a second information-bit-to-modulation-symbol mapping procedure when in a second mode of control channel operation during which said apparatus has a different amount of control channel resources than said apparatus has during said first mode of control channel operation.

53. The apparatus of claim 52, wherein said modulation symbols are modulation symbols transmitted on individual tones.

54. The apparatus of claim 52, wherein said control channel resources are control channel transmission segments, each transmission segment corresponding to multiple symbol transmission time periods;

and

wherein during said first control channel mode of operation said apparatus is dedicated, on average, an integer multiple of the number of control channel segments dedicated to said apparatus during said second control channel mode of operation.