INTERFERENCE CANCELLATION/SUPPRESSION IN TDD WIRELESS COMMUNICATIONS SYSTEMS

• US 20140301251A1
• Filed: 03/31/2014
• Published: 10/09/2014
• Est. Priority Date: 04/05/2013
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Chen, Wanshi, Luo, Tao, Xu, Hao, Gaal, Peter, Yoo, Taesang, Wei, Yongbin, Malladi, Durga Prasad
• Granted Patent: US 10,091,766 B2
• Time in Patent Office: Days
• US Class Current: 370/278
• CPC Class Codes: H04J 11/005 of intercell interference
• CPC Class Codes: H04L 5/003 Arrangements for allocating sub-channels of the transmission path
• CPC Class Codes: H04W 72/02 Selection of wireless resources by user or terminal
• CPC Class Codes: H04W 72/541 using the level of interference

Abstract

A wireless user equipment (UE) may receive a downlink transmission from a base station in a first subframe of a first subframe configuration, and determine that a neighboring base station is operating according to a second subframe configuration. The UE may modify interference operations for the downlink transmission in the first subframe based on the determination to account for the neighboring base station operating according to the different subframe configuration. Modifying interference operations may include, for example, skipping interference operations, applying different interference operations to a subframe or a portion of a subframe, or a combination thereof. Modifying interference operations may be based on one or more characteristics of the neighboring base station communications.

Claims

1. A method for wireless communications performed by a user equipment (UE), comprising:

receiving from a base station a first subframe of a first subframe configuration;

determining whether a neighboring base station is operating according to a second subframe configuration during the first subframe, the second subframe configuration being different from the first subframe configuration; and

modifying interference management operations for the first subframe based on the determination.

2. The method of claim 1, wherein the modifying interference management operations comprises at least partly skipping the interference management operations during at least a portion of the first subframe.

3. The method of claim 1, wherein the first subframe configuration is one of a downlink subframe, an uplink subframe or a special subframe, and the second subframe configuration is one of the downlink subframe, the uplink subframe or the special subframe.

4. The method of claim 1, further comprising:

receiving information from the base station identifying at least a portion of one or more subframes in which the interference management operations are to be at least partly skipped.

5. The method of claim 4, wherein the information comprises an indication of a time-division duplex (TDD) uplink/downlink (UL/DL) configuration for the neighboring base station and a subset of subframes containing interference is determined based on the TDD UL/DL configuration for the neighboring base station.

6. The method of claim 1, wherein the determining comprises:

detecting whether a second subframe for the neighboring base station, that at least partly overlaps the first subframe, comprises one or more of a downlink transmission or an uplink transmission.

7. The method of claim 6, wherein the detecting comprises:

receiving a reference signal of the neighboring base station; and

determining whether the second subframe for the neighboring base station comprises a downlink transmission and/or an uplink transmission based on information associated with the reference signal.

8. The method of claim 6, wherein the second subframe configuration is determined based on a resource block of the neighboring base station and an assumption that all transmitted subframes of the neighboring base station are consistent with the information in the resource block.

9. The method of claim 1, further comprising:

receiving from the base station a third subframe of a third subframe configuration, the third subframe comprising a first special subframe (SSF);

determining that the neighboring base station is operating according to a fourth subframe configuration during the third subframe; and

modifying the interference management operations for the third subframe in response to the third subframe configuration being the same as the fourth subframe configuration.

10. The method of claim 9, wherein the modifying interference management operations comprises at least partly skipping the interference management operations during at least a portion of the third subframe for the SSF.

11. A non-transitory computer-readable medium, comprising code for:

receiving from a base station a first subframe of a first subframe configuration;

determining whether a neighboring base station is operating according to a second subframe configuration during the first subframe, the second subframe configuration being different from the first subframe configuration; and

modifying interference management operations for the first subframe based on the determination.

12. The computer program product of claim 11, wherein the code for modifying interference management operations comprises code for at least partly skipping the interference management operations during at least a portion of the first subframe.

13. The computer program product of claim 11, wherein the first subframe configuration is one of a downlink subframe, an uplink subframe or a special subframe, and the second subframe configuration is one of a downlink subframe, an uplink subframe or a special subframe.

14. The computer-readable medium of claim 11, further comprising:

receiving information from the base station identifying at least a portion of one or more subframes in which the interference management operations are to be at least partly skipped.

15. The computer-readable medium of claim 11, further comprising code for:

detecting whether a second subframe for the neighboring base station, that at least partly overlaps the first subframe, comprises one or more of a downlink transmission or an uplink transmission.

16. The computer-readable medium of claim 15, wherein the code for detecting further comprises code for:

receiving a reference signal of the neighboring base station; and

determining whether the second subframe for the neighboring base station comprises a downlink transmission and/or an uplink transmission based on information associated with the reference signal.

17. The computer-readable medium of claim 15, wherein the second subframe configuration is determined based on a resource block of the neighboring base station and an assumption that all transmitted subframes of the neighboring base station are consistent with the information in the resource block.

18. The computer-readable medium of claim 11, further comprising code for:

receiving from the base station a third subframe of a third subframe configuration, the third subframe comprising a first special subframe (SSF);

determining that the neighboring base station is operating according to a fourth subframe configuration during the third subframe; and

modifying the interference management operations for the third subframe in response to the third subframe configuration being the same as the fourth subframe configuration.

19. The computer-readable medium of claim 18, wherein the modifying interference management operations comprises at least partly skipping the interference management operations during at least a portion of the third subframe for the SSF.

20. A user equipment device for wireless communication, comprising:

a processor; and

a memory in electronic communication with the processor, the memory embodying instructions, the instructions being executable by the processor to;

receive from a base station a first subframe of a first subframe configuration;

determine whether a neighboring base station is operating according to a second subframe configuration during the first subframe, the second subframe configuration being different from the first subframe configuration; and

modify interference management operations for the first subframe based on the determination.

21. The device of claim 20, wherein the modifying interference management operations comprises at least partly skipping the interference management operations during at least a portion of the first subframe.

22. The device of claim 20, wherein the first subframe configuration is one of a downlink subframe, an uplink subframe or a special subframe, and the second subframe configuration is one of a downlink subframe, an uplink subframe or a special subframe.

23. The device of claim 20, wherein the instructions are further executable to:

receive information from the base station identifying at least a portion of one or more subframes in which the interference management operations are to be at least partly skipped.

24. The device of claim 23, wherein the information comprises an indication of a time-division duplex (TDD) uplink/downlink (UL/DL) configuration for the neighboring base station and a subset of subframes containing interference is determined based on the TDD UL/DL configuration for the neighboring base station.

25. The device of claim 20, wherein the instructions to determine include instructions to:

detect whether a second subframe for the neighboring base station, that at least partly overlaps the first subframe, comprises one or more of a downlink transmission or an uplink transmission.

26. The device of claim 25, wherein the detecting comprises:

receiving a reference signal of the neighboring base station; and

determining whether the second subframe for the neighboring base station comprises a downlink transmission and/or an uplink transmission based on information associated with the reference signal.

27. The device of claim 25, wherein the second subframe configuration is determined based on a resource block of the neighboring base station and an assumption that all transmitted subframes of the neighboring base station are consistent with the information in the resource block.

28. A method for wireless communications performed by a base station, comprising:

identifying a first subframe configuration for a first subframe associated with a user equipment (UE);

determining that a neighboring base station is operating according to a second subframe configuration during the first subframe that is different from the first subframe configuration; and

modifying interference operations for the first subframe based on the determination.

29. The method of claim 28, wherein the modifying interference management operations comprises transmitting information to the UE identifying the first subframe for interference management modification.

30. The method of claim 29, wherein the information comprises a bitmap identifying a subset of subframes and the modifying interference management operations comprises at least partly skipping the interference management operations during at least a portion of the first subframe.