Employing neighboring cell assistance information for interference mitigation

Patent metadata

Field	Value
Publication number	US-10448351-B2
Application number	US-201414227279-A
Country	US
Kind code	B2
Filing date	Mar 27, 2014
Priority date	Apr 2, 2013
Publication date	Oct 15, 2019
Grant date	Oct 15, 2019

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.

First claim

What is claimed is:

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 user equipment (UE) served in a serving cell, wherein the assistance information comprises:
a transmission power ratio,
scheduling information for one or more downlink channels transmitted in the one or more cells, and
at least one of a synchronization indicator, a subframe alignment indicator, a radio frame boundary indicator, paging information associated with the one or more cells, an identifier associated with one or more subframes for interference suppression, or a starting physical downlink data channel symbol position; and

signaling the assistance information to the UE,
wherein the scheduling information is included in at least one of a physical downlink control channel (PDCCH) or an enhanced PDCCH (ePDCCH); and
wherein a format of the at least one of the PDCCH or ePDCCH indicates the at least one of the PDCCH or ePDCCH includes the scheduling information, wherein the format is different from another format of another PDCCH or another ePDCCH that conveys a grant of transmission resources for an uplink transmission or a downlink transmission.

2. The method of claim 1 , 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).

3. The method of claim 1 , wherein the at least one of the PDCCH or ePDCCH is transmitted by the one or more cells that cause or potentially cause interference.

4. 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.

5. The method of claim 1 , wherein the assistance information further comprises a virtual cell identifier associated with the one or more cells.

6. The method of claim 1 , wherein:
the BS comprises a closed subscriber group (CSG) cell; and
the assistance information further comprises interference cancellation information for interference cancellation of signals transmitted in the CSG cell.

7. The method of claim 6 , wherein the interference cancellation information comprises at least one of a virtual cell identifier associated with the CSG cell or a starting physical downlink shared data channel (PDSCH) symbol position.

8. 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 user equipment (UE) served in a serving cell, wherein the assistance information comprises:
a transmission power ratio,
scheduling information for one or more downlink channels transmitted in the one or more cells, and
at least one of a synchronization indicator, a subframe alignment indicator, a radio frame boundary indicator, paging information associated with the one or more cells, an identifier associated with one or more subframes for interference suppression, or a starting physical downlink data channel symbol position, and

signal the assistance information to the UE,
wherein the scheduling information is included in at least one of a physical downlink control channel (PDCCH) or an enhanced PDCCH (ePDCCH); and
wherein a format of the at least one of the PDCCH or ePDCCH indicates the at least one of the PDCCH or ePDCCH includes the scheduling information, wherein the format is different from another format of another PDCCH or another ePDCCH that conveys a grant of transmission resources for an uplink transmission or a downlink transmission; and

a memory coupled to the processor.

9. The BS of claim 8 , 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).

10. The BS of claim 8 , wherein the at least one of the PDCCH or ePDCCH is transmitted by the one or more cells that cause or potentially cause interference.

11. The BS of claim 8 , wherein:
the BS comprises a closed subscriber group (CSG) cell; and
the assistance information is associated with an open access cell.

12. The BS of claim 8 , wherein the assistance information further comprises a virtual cell identifier associated with the one or more cells.

13. The BS of claim 8 , wherein:
the BS comprises a closed subscriber group (CSG) cell; and
the assistance information further comprises interference cancellation information for interference cancellation of signals transmitted in the CSG cell.

14. The BS of claim 13 , wherein the interference cancellation information comprises at least one of a virtual cell identifier associated with the CSG cell, or a starting physical downlink shared data channel (PDSCH) symbol position.

15. A non-transitory computer-readable medium for wireless communication by a base station (BS), the non-transitory computer-readable medium comprising code for:
determining assistance information for one or more cells that cause or potentially cause interference with at least a user equipment (UE) served in a serving cell, wherein the assistance information comprises:
a transmission power ratio,
scheduling information for one or more downlink channels transmitted in the one or more cells, and
at least one of a synchronization indicator, a subframe alignment indicator, a radio frame boundary indicator, paging information associated with the one or more cells, an identifier associated with one or more subframes for interference suppression, or a starting physical downlink data channel symbol position; and

signaling the assistance information to the UE,
wherein the scheduling information is included in at least one of a physical downlink control channel (PDCCH) or an enhanced PDCCH (ePDCCH); and
wherein 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.

16. The non-transitory computer-readable medium of claim 15 , wherein the at least one of the PDCCH or ePDCCH is transmitted by the one or more cells that cause or potentially cause interference.

17. The non-transitory computer-readable medium of claim 15 , wherein:
the BS comprises a closed subscriber group (CSG) cell; and
the assistance information is associated with an open access cell.

18. The non-transitory computer-readable medium of claim 15 , wherein:
the BS comprises a closed subscriber group (CSG) cell; and
the assistance information further comprises interference cancellation information for interference cancellation of signals transmitted in the CSG cell.

19. A method for wireless communications by a user equipment (UE), comprising:
receiving, at the UE, 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, wherein the assistance information comprises:
a transmission power ratio,
scheduling information for one or more downlink channels transmitted in the one or more cells, and
at least one of a synchronization indicator, a subframe alignment indicator, a radio frame boundary indicator, paging information associated with the one or more cells, an

Assignees

• Qualcomm Inc

Inventors

• Yoo Taesang
• Luo Tao
• Chen Wanshi
• Xu Hao
• Wei Yongbin
• Gaal Peter
• Malladi Durga Prasad

Classifications

• H04W72/54

  based on quality criteria · CPC title

• H04W72/23

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04W56/003 Primary

  Arrangements to increase tolerance to errors in transmission or reception timing · CPC title

• H04W72/1226

  Electricity · mapped topic

• H04W72/042

  Electricity · mapped topic