ENB PDCCH IMPLEMENTATION TO AVOID AMBIGUOUS DCI INFORMATION

• US 20140185540A1
• Filed: 09/10/2013
• Published: 07/03/2014
• Est. Priority Date: 01/03/2013
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: GAAL, Peter, MOTAMED, Mariam, CHEN, Wanshi, GOROKHOV, Alexei Y., BRESSANELLI, Dominique F., AYDIN, Levent
• Granted Patent: US 9,635,659 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04L 1/0046 Code rate detection or code type detection H04L1/0038 takes precedence; detection of the data rate H04L25/0262; for packet format H04L1/0091
• CPC Class Codes: H04L 1/0061 Error detection codes
• CPC Class Codes: H04L 1/0072 Error control for data other than payload data, e.g. control data
• CPC Class Codes: H04L 1/1867 Arrangements specially adapted for the transmitter end
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/14 Two-way operation using the same type of signal, i.e. duplex
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 72/56 based on priority criteria

Abstract

A method, an apparatus, and a computer program product for wireless communication are provided. The apparatus determines a first decoding candidate in a first search space and a second decoding candidate in a second search space, where the first decoding candidate and the second decoding candidate have a same size but different definitions of information fields, identifies a difference in the information fields, and determines one of the first decoding candidate and the second decoding candidate as a valid candidate based on the identified difference. The apparatus further generates first control information for transmitting in a first search space, codes the first control information, wherein the code applied to the first control information is specific to the first search space and different from code applied to second control information in a second search space, and transmits the coded first control information in the first search space.

Claims

1. A method of wireless communication, comprising:

determining a first decoding candidate in a first search space and a second decoding candidate in a second search space, where the first decoding candidate and the second decoding candidate have a same size but different definitions of information fields;

identifying a difference in the information fields; and

determining one of the first decoding candidate and the second decoding candidate as a valid candidate based on the identified difference.

2. The method of claim 1, wherein the first decoding candidate and the second decoding candidate have a same starting control channel element (CCE).

3. The method of claim 1, wherein the difference occurs at the beginning of a downlink control information (DCI) message, the method further comprising determining the first decoding candidate as the valid candidate.

4. The method of claim 3, wherein a distinct information field in the DCI message comprises a cross-carrier indicator field (CIF).

5. The method of claim 1, wherein the difference occurs towards the end of a downlink control information (DCI) message, the method further comprising determining the second decoding candidate as the valid candidate.

6. The method of claim 5, wherein a distinct information field in the DCI message comprises at least one of a channel state information (CSI) request field or a sounding reference signal (SRS) request field.

7. The method of claim 1, wherein the first search space is a common search space (CSS) and the second search space is a user equipment specific search space (UESS).

8. An apparatus for wireless communication, comprising:

means for determining a first decoding candidate in a first search space and a second decoding candidate in a second search space, where the first decoding candidate and the second decoding candidate have a same size but different definitions of information fields;

means for identifying a difference in the information fields; and

means for determining one of the first decoding candidate and the second decoding candidate as a valid candidate based on the identified difference.

9. The apparatus of claim 8, wherein the first decoding candidate and the second decoding candidate have a same starting control channel element (CCE).

10. The apparatus of claim 8, wherein the difference occurs at the beginning of a downlink control information (DCI) message, the means for determining the valid candidate configured to determine the first decoding candidate as the valid candidate.

11. The apparatus of claim 10, wherein a distinct information field in the DCI message comprises a cross-carrier indicator field (CIF).

12. The apparatus of claim 8, wherein the difference occurs towards the end of a downlink control information (DCI) message, the means for determining the valid candidate configured to determine the second decoding candidate as the valid candidate.

13. The apparatus of claim 12, wherein a distinct information field in the DCI message comprises at least one of a channel state information (CSI) request field or a sounding reference signal (SRS) request field.

14. The apparatus of claim 8, wherein the first search space is a common search space (CSS) and the second search space is a user equipment specific search space (UESS).

15. An apparatus for wireless communication, comprising:

a processing system configured to;

determine a first decoding candidate in a first search space and a second decoding candidate in a second search space, where the first decoding candidate and the second decoding candidate have a same size but different definitions of information fields;

identify a difference in the information fields; and

determine one of the first decoding candidate and the second decoding candidate as a valid candidate based on the identified difference.

16. The apparatus of claim 15, wherein the first decoding candidate and the second decoding candidate have a same starting control channel element (CCE).

17. The apparatus of claim 15, wherein the difference occurs at the beginning of a downlink control information (DCI) message, the processing system further configured to determine the first decoding candidate as the valid candidate.

18. The apparatus of claim 17, wherein a distinct information field in the DCI message comprises a cross-carrier indicator field (CIF).

19. The apparatus of claim 15, wherein the difference occurs towards the end of a downlink control information (DCI) message, the processing system further configured to determine the second decoding candidate as the valid candidate.

20. The apparatus of claim 19, wherein a distinct information field in the DCI message comprises at least one of a channel state information (CSI) request field or a sounding reference signal (SRS) request field.

21. The apparatus of claim 15, wherein the first search space is a common search space (CSS) and the second search space is a user equipment specific search space (UESS).

22. A computer program product, comprising:

a computer-readable medium comprising code for;

determining a first decoding candidate in a first search space and a second decoding candidate in a second search space, where the first decoding candidate and the second decoding candidate have a same size but different definitions of information fields;

identifying a difference in the information fields; and

determining one of the first decoding candidate and the second decoding candidate as a valid candidate based on the identified difference.

23. A method of wireless communication, comprising:

generating first control information for transmitting in a first search space; and

for a first subset of subframes;

assigning a first priority to the first control information to be transmitted in the first search space, the first priority higher than a second priority assigned to second control information transmitted in a second search space, and

transmitting the first control information with the assigned first priority in the first search space.

24. The method of claim 23, wherein the first subset of subframes comprises subframes where a user equipment (UE) receives reconfiguration information.

25. The method of claim 24, wherein the first subset of subframes comprises:

subframes 0, 4, 5, and 9 for a frequency division duplex (FDD) system; and

subframes 0, 1, 5, and 6 for a time division duplex (TDD) system.

26. The method of claim 23, further comprising:

for a second subset of subframes;

assigning a third priority to the first control information to be transmitted in the first search space, the third priority lower than a fourth priority assigned to the second control information transmitted in the second search space, and

transmitting the first control information with the assigned third priority in the first search space.

27. The method of claim 26, wherein the second subset of subframes comprises subframes where a user equipment (UE) does not receive reconfiguration information.

28. The method of claim 26, wherein the first search space is a common search space (CSS) and the second search space is user equipment specific search space (UESS).

29. An apparatus for wireless communication, comprising:

means for generating first control information for transmitting in a first search space; and

for a first subset of subframes;

means for assigning a first priority to the first control information to be transmitted in the first search space, the first priority higher than a second priority assigned to second control information transmitted in a second search space, and

means for transmitting the first control information with the assigned first priority in the first search space.

30. The apparatus of claim 29, wherein the first subset of subframes comprises subframes where a user equipment (UE) receives reconfiguration information.

31. The apparatus of claim 30, wherein the first subset of subframes comprises:

subframes 0, 4, 5, and 9 for a frequency division duplex (FDD) system; and

subframes 0, 1, 5, and 6 for a time division duplex (TDD) system.

32. The apparatus of claim 29, further comprising:

for a second subset of subframes;

means for assigning a third priority to the first control information to be transmitted in the first search space, the third priority lower than a fourth priority assigned to the second control information transmitted in the second search space, and

means for transmitting the first control information with the assigned third priority in the first search space.

33. The apparatus of claim 32, wherein the second subset of subframes comprises subframes where a user equipment (UE) does not receive reconfiguration information.

34. The method of claim 32, wherein the first search space is a common search space (CSS) and the second search space is user equipment specific search space (UESS).

35. An apparatus for wireless communication, comprising:

a processing system configured to;

generate first control information for transmitting in a first search space; and

for a first subset of subframes;

assign a first priority to the first control information to be transmitted in the first search space, the first priority higher than a second priority assigned to second control information transmitted in a second search space, and

transmit the first control information with the assigned first priority in the first search space.

36. The apparatus of claim 35, wherein the first subset of subframes comprises subframes where a user equipment (UE) receives reconfiguration information.

37. The apparatus of claim 36, wherein the first subset of subframes comprises:

subframes 0, 4, 5, and 9 for a frequency division duplex (FDD) system; and

subframes 0, 1, 5, and 6 for a time division duplex (TDD) system.

38. The apparatus of claim 35, the processing system further configured to:

for a second subset of subframes;

assign a third priority to the first control information to be transmitted in the first search space, the third priority lower than a fourth priority assigned to the second control information transmitted in the second search space, and

transmit the first control information with the assigned third priority in the first search space.

39. The apparatus of claim 38, wherein the second subset of subframes comprises subframes where a user equipment (UE) does not receive reconfiguration information.

40. The method of claim 38, wherein the first search space is a common search space (CSS) and the second search space is user equipment specific search space (UESS).

41. A computer program product, comprising:

a computer-readable medium comprising code for;

generating first control information for transmitting in a first search space; and

for a first subset of subframes;

assigning a first priority to the first control information to be transmitted in the first search space, the first priority higher than a second priority assigned to second control information transmitted in a second search space, and

transmitting the first control information with the assigned first priority in the first search space.

42. The computer program product of claim 41, the computer-readable medium further comprising code for:

for a second subset of subframes;

assigning a third priority to the first control information to be transmitted in the first search space, the third priority lower than a fourth priority assigned to the second control information transmitted in the second search space, and

transmitting the first control information with the assigned third priority in the first search space.