EMPLOYING NEIGHBORING CELL ASSISTANCE INFORMATION FOR INTERFERENCE MITIGATION

• US 20140293971A1
• Filed: 03/27/2014
• Published: 10/02/2014
• Est. Priority Date: 04/02/2013
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: YOO, Taesang, LUO, Tao, CHEN, Wanshi, XU, Hao, WEI, Yongbin, GAAL, Peter, MALLADI, Durga Prasad
• Granted Patent: US 10,448,351 B2
• Time in Patent Office: Days
• US Class Current: 370/336
• CPC Class Codes: H04W 56/003 Arrangements to increase tolerance to errors in transmission or reception timing
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 72/54 based on quality criteria

Abstract

Certain aspects of the present disclosure relate to methods and apparatus for employing a neighboring cell'"'"'s assistance information for interference mitigation (e.g., by conveying the information to a user equipment). A base station (BS) may determine assistance information for a neighboring cell and convey it to a user equipment (UE). A UE may receive assistance information for a neighboring cell and use that information for performing interference cancellation or suppression on received signals. The UE may receive the assistance information from a serving cell or a non-serving cell. The assistance information may be valid for a particular transmission instance, for a known period of time, or until updated by a BS.

Claims

1. A method for wireless communication by a base station (BS), comprising:

determining assistance information for one or more cells that cause or potentially cause interference with at least a first user equipment (UE) served in a serving cell; and

signaling the assistance information to the UE.

2. The method of claim 1, wherein the assistance information comprises scheduling information for one or more downlink channels transmitted in the one or more cells.

3. The method of claim 2, wherein the one or more downlink channels comprise at least one of a physical downlink shared channel (PDSCH), physical control format indicator channel (PCFICH), physical HARQ indicator channel (PHICH), physical downlink control channel (PDCCH), or enhanced PDCCH (ePDCCH).

4. The method of claim 2, wherein the scheduling information to the UE is included in at least one of a physical downlink control channel (PDCCH) or an enhanced PDCCH (ePDCCH).

5. The method of claim 4, wherein the at least one of the PDCCH or ePDCCH is transmitted by the one or more cells that cause or potentially cause interference.

6. The method of claim 4, wherein a format of the at least one of the PDCCH or ePDCCH or an identifier used to encode the at least one of the PDCCH or ePDCCH indicates the at least one of the PDCCH or ePDCCH includes the scheduling information.

7. The method of claim 1, wherein:

the BS comprises a closed subscriber group (CSG) cell; and

the assistance information is associated with an open access cell.

8. The method of claim 7, wherein the assistance information comprises at least one of a synchronization indicator, a subframe alignment indicator, a radio frame boundary indicator, system information associated with the one or more cells, paging information associated with the one or more cells, an identifier associated with one or more subframes for interference suppression, a transmission power ratio, a virtual cell identifier associated with the one or more cells, or a starting physical downlink data channel symbol position.

9. The method of claim 1, wherein:

the BS comprises a closed subscriber group (CSG) cell; and

the assistance information comprises interference cancellation information for interference cancellation of signals transmitted in the CSG cell.

10. The method of claim 9, wherein the interference cancellation information comprises at least one of a transmission power ratio, a virtual cell identifier associated with the CSG cell, or a starting physical downlink shared data channel (PDSCH) symbol position.

11. A base station (BS) for wireless communication, comprising:

a processor configured to;

determine assistance information for one or more cells that cause or potentially cause interference with at least a first user equipment (UE) served in a serving cell, and

signal the assistance information to the UE; and

a memory coupled to the processor.

12. The BS of claim 11, wherein the assistance information comprises scheduling information for one or more downlink channels transmitted in the one or more cells.

13. The BS of claim 12, wherein the one or more downlink channels comprise at least one of a physical downlink shared channel (PDSCH), physical control format indicator channel (PCFICH), physical HARQ indicator channel (PHICH), physical downlink control channel (PDCCH), or enhanced PDCCH (ePDCCH).

14. The BS of claim 12, wherein the scheduling information to the UE is included in at least one of a physical downlink control channel (PDCCH) or an enhanced PDCCH (ePDCCH).

15. The BS of claim 14, wherein the at least one of the PDCCH or ePDCCH is transmitted by the one or more cells that cause or potentially cause interference.

16. The BS of claim 14, wherein a format of the at least one of the PDCCH or ePDCCH or an identifier used to encode the at least one of the PDCCH or ePDCCH indicates the at least one of the PDCCH or ePDCCH includes the scheduling information.

17. The BS of claim 11, wherein:

the BS comprises a closed subscriber group (CSG) cell; and

the assistance information is associated with an open access cell.

18. The BS of claim 17, wherein the assistance information comprises at least one of a synchronization indicator, a subframe alignment indicator, a radio frame boundary indicator, system information associated with the one or more cells, paging information associated with the one or more cells, an identifier associated with one or more subframes for interference suppression, a transmission power ratio, a virtual cell identifier associated with the one or more cells, or a starting physical downlink data channel symbol position.

19. The BS of claim 11, wherein:

the BS comprises a closed subscriber group (CSG) cell; and

the assistance information comprises interference cancellation information for interference cancellation of signals transmitted in the CSG cell.

20. The BS of claim 19, wherein the interference cancellation information comprises at least one of a transmission power ratio, a virtual cell identifier associated with the CSG cell, or a starting physical downlink shared data channel (PDSCH) symbol position.

21. A computer program product for wireless communication by a base station (BS), comprising a computer-readable medium comprising code for:

determining assistance information for one or more cells that cause or potentially cause interference with at least a first user equipment (UE) served in a serving cell; and

signaling the assistance information to the UE.

22. The computer program product of claim 21, wherein the assistance information comprises scheduling information for one or more downlink channels transmitted in the one or more cells.

23. The computer program product of claim 22, wherein the scheduling information to the UE is included in at least one of a physical downlink control channel (PDCCH) or an enhanced PDCCH (ePDCCH).

24. The computer program product of claim 23, wherein the at least one of the PDCCH or ePDCCH is transmitted by the one or more cells that cause or potentially cause interference.

25. The computer program product of claim 21, wherein:

the BS comprises a closed subscriber group (CSG) cell; and

the assistance information is associated with an open access cell.

26. The computer program product of claim 21, wherein:

the BS comprises a closed subscriber group (CSG) cell; and

the assistance information comprises interference cancellation information for interference cancellation of signals transmitted in the CSG cell.

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

receiving signaling of assistance information for one or more cells that cause or potentially cause interference with at least the UE served in a serving cell; and

using the information to mitigate interference by transmissions from at least one of the serving cell or one or more cells that cause interference.

28. The method of claim 27, wherein:

receiving signaling of assistance information comprises receiving signaling of assistance information from a non-serving closed subscriber group (CSG) cell; and

the assistance information is associated with an open access cell.

29. A user equipment (UE) for wireless communications, comprising:

a processor configured to;

receive signaling of assistance information for one or more cells that cause or potentially cause interference with at least the UE served in a serving cell; and

use the information to mitigate interference by transmissions from at least one of the serving cell or one or more cells that cause interference; and

a memory coupled to the processor.

30. The UE of claim 29, wherein:

the processor is further configured to receive signaling of assistance information from a non-serving closed subscriber group (CSG) cell; and

the assistance information is associated with an open access cell.