ENB PDCCH IMPLEMENTATION TO AVOID AMBIGUOUS DCI INFORMATION

• US 20140185541A1
• 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, CHEN, Wanshi, MOTAMED, Mariam, GOROKHOV, Alexei Y., BRESSANELLI, Dominique F., AYDIN, Levent
• Granted Patent: US 9,320,032 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 starting index for transmitting first control information in a first search space, determines a second starting index for transmitting second control information in a second search space, and transmits the second control information in the second search space at the second starting index when the first starting index and the second starting index are not the same value. The apparatus further transmits to a user equipment (UE) control information in a first search space, receives information from the UE corresponding to the transmitted control information, and decodes the received information based on the UE parsing the control information according to the first search space and based on the UE incorrectly parsing the control information according to a second search space.

Claims

1. A method of wireless communication, comprising:

determining a first starting index for transmitting first control information in a first search space;

determining a second starting index for transmitting second control information in a second search space; and

transmitting the second control information in the second search space at the second starting index when the first starting index and the second starting index are not the same value.

2. The method of claim 1, wherein the first starting index is determined based on at least a candidate index and an aggregation level corresponding to the first search space used for transmitting the first control information.

3. The method of claim 1, wherein the second starting index is determined based on at least a candidate index and an aggregation level corresponding to the second search space for transmitting the second control information.

4. The method of claim 3, further comprising selecting at least one candidate index for determining the second starting index that results in a value of the second starting index that is not the same as a value of the first starting index.

5. The method of claim 1, further comprising:

refraining from transmitting the second control information in the second search space at the second starting index when the first starting index and the second starting index are the same value;

determining a third starting index for transmitting the second control information in the second search space by avoiding to use a starting index that has the same value as the first starting index; and

transmitting the second control information in the second search space at the third starting index when the first starting index and the third starting index are not the same value.

6. A method of wireless communication, comprising:

transmitting to a user equipment (UE) control information in a first search space;

receiving information from the UE corresponding to the transmitted control information; and

decoding the received information based on the UE parsing the control information according to the first search space and based on the UE incorrectly parsing the control information according to a second search space.

7. The method of claim 6, wherein the control information is transmitted in the first search space at a starting index that is the same as a starting index for transmitting second control information in the second search space.

8. A method of wireless communication, comprising:

determining a first aggregation level having a number of control channel elements (CCEs) used for first control information in a first search space;

transmitting second control information in a second search space using a second aggregation level having a lower value than the first aggregation level, wherein the second search space is enclosed within the first search space, and wherein a starting CCE for transmitting the first control information in the first search space is the same as a starting CCE for transmitting the second control information in the second search space;

determining at least one CCE of the first aggregation level not used for transmitting the first control information; and

transmitting interference on the at least one unused CCE to degrade decoding of the first control information in the first search space.

9. A method of wireless communication, comprising:

determining a first starting index for transmitting a first control message in a first search space;

determining a second starting index for transmitting a second control message in a second search space; and

when the first starting index and the second starting index have the same value;

determining at least one information field different between the first control message and the second control message, and

setting a bit of the at least one different information field to zero in the first control message and the second control message.

10. The method of claim 9, wherein the first search space is a common search space (CSS) and the second search space is a user equipment specific search space (UESS).

11. The method of claim 9, wherein the first search space is a user equipment specific search space (UESS) and the second search space is a common search space (CSS).

12. The method of claim 9, further comprising transmitting the second control message in the second search space at the second starting index.

13. An apparatus for wireless communication, comprising:

means for determining a first starting index for transmitting first control information in a first search space;

means for determining a second starting index for transmitting second control information in a second search space; and

means for transmitting the second control information in the second search space at the second starting index when the first starting index and the second starting index are not the same value.

14. The apparatus of claim 13, further comprising:

means for refraining from transmitting the second control information in the second search space at the second starting index when the first starting index and the second starting index are the same value;

means for determining a third starting index for transmitting the second control information in the second search space by avoiding to use a starting index that has the same value as the first starting index; and

means for transmitting the second control information in the second search space at the third starting index when the first starting index and the third starting index are not the same value.

15. An apparatus for wireless communication, comprising:

means for transmitting to a user equipment (UE) control information in a first search space;

means for receiving information from the UE corresponding to the transmitted control information; and

means for decoding the received information based on the UE parsing the control information according to the first search space and based on the UE incorrectly parsing the control information according to a second search space.

16. The apparatus of claim 15, wherein the control information is transmitted in the first search space at a starting index that is the same as a starting index for transmitting second control information in the second search space.

17. An apparatus for wireless communication, comprising:

means for determining a first aggregation level having a number of control channel elements (CCEs) used for first control information in a first search space;

means for transmitting second control information in a second search space using a second aggregation level having a lower value than the first aggregation level, wherein the second search space is enclosed within the first search space, and wherein a starting CCE for transmitting the first control information in the first search space is the same as a starting CCE for transmitting the second control information in the second search space;

means for determining at least one CCE of the first aggregation level not used for transmitting the first control information; and

means for transmitting interference on the at least one unused CCE to degrade decoding of the first control information in the first search space.

18. An apparatus for wireless communication, comprising:

means for determining a first starting index for transmitting a first control message in a first search space;

means for determining a second starting index for transmitting a second control message in a second search space; and

when the first starting index and the second starting index have the same value;

means for determining at least one information field different between the first control message and the second control message, and

means for setting a bit of the at least one different information field to zero in the first control message and the second control message.

19. The apparatus of claim 18, further comprising means for transmitting the second control message in the second search space at the second starting index.

20. An apparatus for wireless communication, comprising:

a processing system configured to;

determine a first starting index for transmitting first control information in a first search space;

determine a second starting index for transmitting second control information in a second search space; and

transmit the second control information in the second search space at the second starting index when the first starting index and the second starting index are not the same value.

21. The apparatus of claim 20, the processing system further configured to:

refrain from transmitting the second control information in the second search space at the second starting index when the first starting index and the second starting index are the same value;

determine a third starting index for transmitting the second control information in the second search space by avoiding to use a starting index that has the same value as the first starting index; and

transmit the second control information in the second search space at the third starting index when the first starting index and the third starting index are not the same value.

22. An apparatus for wireless communication, comprising:

a processing system configured to;

transmit to a user equipment (UE) control information in a first search space;

receive information from the UE corresponding to the transmitted control information; and

decode the received information based on the UE parsing the control information according to the first search space and based on the UE incorrectly parsing the control information according to a second search space.

23. The apparatus of claim 22, wherein the control information is transmitted in the first search space at a starting index that is the same as a starting index for transmitting second control information in the second search space.

24. An apparatus for wireless communication, comprising:

a processing system configured to;

determine a first aggregation level having a number of control channel elements (CCEs) used for first control information in a first search space;

transmit second control information in a second search space using a second aggregation level having a lower value than the first aggregation level, wherein the second search space is enclosed within the first search space, and wherein a starting CCE for transmitting the first control information in the first search space is the same as a starting CCE for transmitting the second control information in the second search space;

determine at least one CCE of the first aggregation level not used for transmitting the first control information; and

transmit interference on the at least one unused CCE to degrade decoding of the first control information in the first search space.

25. An apparatus for wireless communication, comprising:

a processing system configured to;

determine a first starting index for transmitting a first control message in a first search space;

determine a second starting index for transmitting a second control message in a second search space; and

when the first starting index and the second starting index have the same value;

determine at least one information field different between the first control message and the second control message, and

set a bit of the at least one different information field to zero in the first control message and the second control message.

26. The apparatus of claim 25, the processing system further configured to transmit the second control message in the second search space at the second starting index.

27. A computer program product, comprising:

a computer-readable medium comprising code for;

determining a first starting index for transmitting first control information in a first search space;

determining a second starting index for transmitting second control information in a second search space; and

transmitting the second control information in the second search space at the second starting index when the first starting index and the second starting index are not the same value.

28. The computer program product of claim 27, the computer-readable medium further comprising code for:

refraining from transmitting the second control information in the second search space at the second starting index when the first starting index and the second starting index are the same value;

determining a third starting index for transmitting the second control information in the second search space by avoiding to use a starting index that has the same value as the first starting index; and

transmitting the second control information in the second search space at the third starting index when the first starting index and the third starting index are not the same value.

29. A computer program product, comprising:

a computer-readable medium comprising code for;

transmitting to a user equipment (UE) control information in a first search space;

receiving information from the UE corresponding to the transmitted control information; and

decoding the received information based on the UE parsing the control information according to the first search space and based on the UE incorrectly parsing the control information according to a second search space.

30. A computer program product, comprising:

a computer-readable medium comprising code for;

determining a first aggregation level having a number of control channel elements (CCEs) used for first control information in a first search space;

transmitting second control information in a second search space using a second aggregation level having a lower value than the first aggregation level, wherein the second search space is enclosed within the first search space, and wherein a starting CCE for transmitting the first control information in the first search space is the same as a starting CCE for transmitting the second control information in the second search space;

determining at least one CCE of the first aggregation level not used for transmitting the first control information; and

transmitting interference on the at least one unused CCE to degrade decoding of the first control information in the first search space.

31. A computer program product, comprising:

a computer-readable medium comprising code for;

determining a first starting index for transmitting a first control message in a first search space;

determining a second starting index for transmitting a second control message in a second search space; and

when the first starting index and the second starting index have the same value;

determining at least one information field different between the first control message and the second control message, and

setting a bit of the at least one different information field to zero in the first control message and the second control message.

32. The computer program product of claim 31, the computer-readable medium further comprising code for transmitting the second control message in the second search space at the second starting index.