Downlink control information for efficient decoding

1. A method for wireless communications, comprising:

determining a first size of first and second downlink control information (DCI) formats, wherein the first DCI format carries information about a first uplink operation in a single codeword and the second DCI format carries information about at least one downlink operation in a single codeword;

determining a second size of a third DCI format carrying information about a second uplink operation in a single codeword, wherein a number of information bits in the third DCI format is larger than a number of information bits in the first DCI format;

adjusting a size of the second DCI format to match the second size and to obtain a fourth DCI format;

generating a DCI message using one of the first, second, third or fourth DCI formats; and

transmitting the DCI message.

2. The method of claim 1 , wherein the adjusting is performed by adding one or more zero bits to the second DCI format.

3. The method of claim 1 , wherein the first DCI format comprises format 0 and the second DCI format comprises format 1A in the long term evolution (LTE) standard.

4. The method of claim 1 , wherein the second uplink operation comprises a clustered uplink resource allocation operation.

5. The method of claim 1 , wherein the third DCI format carries information about both the first and the second uplink operations in a single codeword.

6. The method of claim 1 , wherein the first size only exists in a common search space and the second size only exists in a user equipment (UE)-specific search space.

7. The method of claim 1 , wherein the first size exists in both common and user equipment (UE)-specific search spaces, and the second size only exists in a UE-specific search space.

8. A method for wireless communications, comprising:

receiving a downlink control information (DCI) message, wherein the DCI message utilizes one of first, second, third or fourth DCI formats, the first and second formats utilizing a first size, wherein the first DCI format carries information about a first uplink operation in a single codeword, wherein the second DCI format carries information about at least one downlink operation in a single codeword, wherein the third DCI format, having a second size, carries information about a second uplink operation in a single codeword, wherein the fourth DCI format carries information similar to the second DCI format, size of the fourth DCI format is matched to the second size, and wherein a number of information bits in the third DCI format is larger than a number of information bits in the first DCI format;

extracting the information in the DCI message; and

transmitting an uplink signal using the extracted information.

9. The method of claim 8 , wherein the first DCI format comprises format 0 and the second DCI format comprises format 1A in the long term evolution (LTE) standard.

10. The method of claim 8 , wherein the second uplink operation comprises a clustered uplink resource allocation operation.

11. The method of claim 8 , wherein the third DCI format carries information about both the first and the second uplink operations in a single codeword.

12. The method of claim 8 , wherein the first size only exists in a common search space and the second size only exists in a user equipment (UE)-specific search space.

13. The method of claim 8 , wherein the first size exists in both common and user equipment (UE)-specific search spaces, and the second size only exists in a UE-specific search space.

14. The method of claim 8 , wherein the information in the DCI message is extracted by blind decoding.

15. An apparatus for wireless communications, comprising:

means for determining a first size of first and second downlink control information (DCI) formats, wherein the first DCI format carries information about a first uplink operation in a single codeword and the second DCI format carries information about at least one downlink operation in a single codeword;

means for determining a second size of a third DCI format carrying information about a second uplink operation in a single codeword, wherein a number of information bits in the third DCI format is larger than a number of information bits in the first DCI format;

means for adjusting a size of the second DCI format to match the second size and to obtain a fourth DCI format;

means for generating a DCI message using one of the first, second, third or fourth DCI formats; and

means for transmitting the DCI message.

16. The apparatus of claim 15 , wherein the means for adjusting comprises means for adding one or more zero bits to the second DCI format.

17. The apparatus of claim 15 , wherein the first DCI format comprises format 0 and the second DCI format comprises format 1A in the long term evolution (LTE) standard.

18. The apparatus of claim 15 , wherein the second uplink operation comprises a clustered uplink resource allocation operation.

19. The apparatus of claim 15 , wherein the third DCI format carries information about both the first and the second uplink operations in a single codeword.

20. The apparatus of claim 15 , wherein the first size only exists in a common search space and the second size only exists in a user equipment (UE)-specific search space.

21. The apparatus of claim 15 , wherein the first size exists in both common and user equipment (UE)-specific search spaces, and the second size only exists in a UE-specific search space.

22. An apparatus for wireless communications, comprising:

means for receiving a downlink control information (DCI) message, wherein the DCI message utilizes one of first, second, third or fourth DCI formats, the first and second formats utilizing a first size, wherein the first DCI format carries information about a first uplink operation in a single codeword, wherein the second DCI format carries information about at least one downlink operation in a single codeword, wherein the third DCI format, having a second size, carries information about a second uplink operation in a single codeword, wherein the fourth DCI format carries information similar to the second DCI format, size of the fourth DCI format is matched to the second size, and wherein a number of information bits in the third DCI format is larger than a number of information bits in the first DCI format;

means for extracting the information in the DCI message; and

means for transmitting an uplink signal using the extracted information.

23. The apparatus of claim 22 , wherein the first DCI format comprises format 0 and the second DCI format comprises format 1A in the long term evolution (LTE) standard.

24. The apparatus of claim 22 , wherein the second uplink operation comprises a clustered uplink resource allocation operation.

25. The apparatus of claim 22 , wherein the third DCI format carries information about both the first and the second uplink operations in a single codeword.

26. The apparatus of claim 22 , wherein the first size only exists in a common search space and the second size only exists in a user equipment (UE)-specific search space.

27. The apparatus of claim 22 , wherein the first size exists in both common and user equipment (UE)-specific search spaces, and the second size only exists in a UE-specific search space.

28. The apparatus of claim 22 , wherein the information in the DCI message is extracted by blind decoding.

29. An apparatus for wireless communications, comprising:

at least one processor configured to

determine a first size of first and second downlink control information (DCI) formats, wherein the first DCI format carries information about a first uplink operation in a single codeword and the second DCI format carries information about at least one downlink operation in a single codeword,

determine a second size of a third DCI format carrying information about a second uplink operation in a single codeword, wherein a number of information bits in the third DCI format is larger than a number of information bits in the first DCI format,

adjust a size of the second DCI format to match the second size and to obtain a fourth DCI format,

generate a DCI message using one of the first, second, third or fourth DCI formats, and

transmit the DCI message; and

a memory coupled to the at least one processor.

30. The apparatus of claim 29 , wherein the at least one processor is further configured to add one or more zero bits to the second DCI format.

31. The apparatus of claim 29 , wherein the first DCI format comprises format 0 and the second DCI format comprises format 1A in the long term evolution (LTE) standard.

32. The apparatus of claim 29 , wherein the second uplink operation comprises a clustered uplink resource allocation operation.

33. The apparatus of claim 29 , wherein the third DCI format carries information about both the first and the second uplink operations in a single codeword.

34. The apparatus of claim 29 , wherein the first size only exists in a common search space and the second size only exists in a user equipment (UE)-specific search space.

35. The apparatus of claim 29 , wherein the first size exists in both common and user equipment (UE)-specific search spaces, and the second size only exists in a UE-specific search space.

36. An apparatus for wireless communications, comprising:

at least one processor configured to

receive a downlink control information (DCI) message, wherein the DCI message utilizes one of first, second, third or fourth DCI formats, the first and second formats utilizing a first size, wherein the first DCI format carries information about a first uplink operation in a single codeword, wherein the second DCI format carries information about at least one downlink operation in a single codeword, wherein the third DCI format, having a second size, carries information about a second uplink operation in a single codeword, wherein the fourth DCI format carries information similar to the second DCI format, size of the fourth DCI format is matched to the second size, and wherein a number of information bits in the third DCI format is larger than a number of information bits in the first DCI format,

extract the information in the DCI message, and

transmit an uplink signal using the extracted information; and

a memory coupled to the at least one processor.

37. The apparatus of claim 36 , wherein the first DCI format comprises format 0 and the second DCI format comprises format 1A in the long term evolution (LTE) standard.

38. The apparatus of claim 36 , wherein the second uplink operation comprises a clustered uplink resource allocation operation.

39. The apparatus of claim 36 , wherein the third DCI format carries information about both the first and the second uplink operations in a single codeword.

40. The apparatus of claim 36 , wherein the first size only exists in a common search space and the second size only exists in a user equipment (UE)-specific search space.

41. The apparatus of claim 36 , wherein the first size exists in both common and user equipment (UE)-specific search spaces, and the second size only exists in a UE-specific search space.

42. The apparatus of claim 36 , wherein the information in the DCI message is extracted by blind decoding.

43. A computer-program product for wireless communications, comprising a non-transitory computer readable medium having instructions stored thereon, the instructions being executable by one or more processors and the instructions comprising:

instructions for determining a first size of first and second downlink control information (DCI) formats, wherein the first DCI format carries information about a first uplink operation in a single codeword and the second DCI format carries information about at least one downlink operation in a single codeword;

instructions for determining a second size of a third DCI format carrying information about a second uplink operation in a single codeword, wherein a number of information bits in the third DCI format is larger than a number of information bits in the first DCI format;

instructions for adjusting a size of the second DCI format to match the second size and to obtain a fourth DCI format;

instructions for generating a DCI message using one of the first, second, third or fourth DCI formats; and

instructions for transmitting the DCI message.

44. The computer-program product of claim 43 , wherein the instructions for adjusting comprises instructions for adding one or more zero bits to the second DCI format.

45. The computer-program product of claim 43 , wherein the first DCI format comprises format 0 and the second DCI format comprises format 1A in the long term evolution (LTE) standard.

46. The computer-program product of claim 43 , wherein the second uplink operation comprises a clustered uplink resource allocation operation.

47. The computer-program product of claim 43 , wherein the third DCI format carries information about both the first and the second uplink operations in a single codeword.

48. The computer-program product of claim 43 , wherein the first size only exists in a common search space and the second size only exists in a user equipment (UE)-specific search space.

49. The computer-program product of claim 43 , wherein the first size exists in both common and user equipment (UE)-specific search spaces, and the second size only exists in a UE-specific search space.

50. A computer-program product for wireless communications, comprising a non-transitory computer readable medium having instructions stored thereon, the instructions being executable by one or more processors and the instructions comprising:

instructions for receiving a downlink control information (DCI) message, wherein the DCI message utilizes one of first, second, third or fourth DCI formats, the first and second formats utilizing a first size, wherein the first DCI format carries information about a first uplink operation in a single codeword, wherein the second DCI format carries information about at least one downlink operation in a single codeword, wherein the third DCI format, having a second size, carries information about a second uplink operation in a single codeword, wherein the fourth DCI format carries information similar to the second DCI format, size of the fourth DCI format is matched to the second size, and wherein a number of information bits in the third DCI format is larger than a number of information bits in the first DCI format;

instructions for extracting the information in the DCI message; and

instructions for transmitting an uplink signal using the extracted information.

51. The computer-program product of claim 50 , wherein the first DCI format comprises format 0 and the second DCI format comprises format 1A in the long term evolution (LTE) standard.

52. The computer-program product of claim 50 , wherein the second uplink operation comprises a clustered uplink resource allocation operation.

53. The computer-program product of claim 50 , wherein the third DCI format carries information about both the first and the second uplink operations in a single codeword.

54. The computer-program product of claim 50 , wherein the first size only exists in a common search space and the second size only exists in a user equipment (UE)-specific search space.

55. The computer-program product of claim 50 , wherein the first size exists in both common and user equipment (UE)-specific search spaces, and the second size only exists in a UE-specific search space.

56. The computer-program product of claim 50 , wherein the information in the DCI message is extracted by blind decoding.