ENB PDCCH implementation to avoid ambiguous DCI information

• US 9,320,032 B2
• Filed: 09/10/2013
• Issued: 04/19/2016
• 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., Aydin, Levent, Bressanelli, Dominique F.
• Primary Examiner(s): Weidner, Timothy J
• Application Number:
  US14/023,438
• Publication Number:
  US 20140185541A1
• Time in Patent Office: 952 Days
• Field of Search: None
• US Class Current: 1/1
• 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 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,

determining whether the at least one different information field in the second control message would have a different interpretation when decoded based on the first search space than when decoded based on the second search space, and

setting a bit of the at least one different information field to zero in the second control message when the at least one information field in the second control message would have a different interpretation when decoded based on the first search space than when decoded based on the second search space.

2. 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).

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

4. The method of claim 1, further comprising transmitting the second control message in the second search space at the second starting index.

5. The method of claim 1, wherein the information field comprises an aperiodic channel state information (CSI) triggering field, an aperiodic sounding reference signal (SRS) triggering field, or a multi-cluster assignment flag field.

6. 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,

means for determining whether the at least one different information field in the second control message would have a different interpretation when decoded based on the first search space than when decoded based on the second search space, and

means for setting a bit of the at least one different information field to zero in the second control message when the at least one information field in the second control message would have a different interpretation when decoded based on the first search space than when decoded based on the second search space.

7. The apparatus of claim 6, further comprising means for transmitting the second control message in the second search space at the second starting index.

8. The apparatus of claim 6, wherein the first search space is a common search space (CSS) and the second search space is a user equipment specific search space (UESS).

9. The apparatus of claim 6, wherein the first search space is a user equipment specific search space (UESS) and the second search space is a common search space (CSS).

10. The apparatus of claim 6, wherein the information field comprises an aperiodic channel state information (CSI) triggering field, an aperiodic sounding reference signal (SRS) triggering field, or a multi-cluster assignment flag field.

11. An apparatus for wireless communication, comprising:

a memory; and

at least one processor coupled to the memory and 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 having a respective bit different between the first control message and the second control message,

determine whether the at least one different information field in the second control message would have a different interpretation when decoded based on the first search space than when decoded based on the second search space, and

set a bit of the at least one different information field to zero in the second control message when the at least one information field in the second control message would have a different interpretation when decoded based on the first search space than when decoded based on the second search space.

12. The apparatus of claim 11, the at least one processor further configured to transmit the second control message in the second search space at the second starting index.

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

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

15. The apparatus of claim 11, wherein the information field comprises an aperiodic channel state information (CSI) triggering field, an aperiodic sounding reference signal (SRS) triggering field, or a multi-cluster assignment flag field.

16. A non-transitory computer-readable medium storing computer executable code, 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 having a respective bit different between the first control message and the second control message,

determining whether the at least one different information field in the second control message would have a different interpretation when decoded based on the first search space than when decoded based on the second search space, and

setting a bit of the at least one different information field to zero in the second control message when the at least one information field in the second control message would have a different interpretation when decoded based on the first search space than when decoded based on the second search space.

17. The non-transitory computer-readable medium of claim 16, the non-transitory computer-readable medium further comprising code for transmitting the second control message in the second search space at the second starting index.

18. The non-transitory computer-readable medium of claim 16, wherein the first search space is a common search space (CSS) and the second search space is a user equipment specific search space (UESS).

19. The non-transitory computer-readable medium of claim 16, wherein the first search space is a user equipment specific search space (UESS) and the second search space is a common search space (CSS).

20. The non-transitory computer-readable medium of claim 16, wherein the information field comprises an aperiodic channel state information (CSI) triggering field, an aperiodic sounding reference signal (SRS) triggering field, or a multi-cluster assignment flag field.