Reporting of timing information to support downlink data transmission
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H04L-012/26
H04W-056/00
H04B-007/02
출원번호
US-0903050
(2010-10-12)
등록번호
US-8948028
(2015-02-03)
발명자
/ 주소
Zhang, Xiaoxia
Luo, Tao
출원인 / 주소
QUALCOMM Incorporated
인용정보
피인용 횟수 :
2인용 특허 :
4
초록▼
Techniques for reporting timing information to facilitate data transmission on a downlink are described. A user equipment (UE) may receive signals from a plurality of cells available for data transmission to the UE. Each cell may have a different propagation delay to the UE. The UE may determine tim
Techniques for reporting timing information to facilitate data transmission on a downlink are described. A user equipment (UE) may receive signals from a plurality of cells available for data transmission to the UE. Each cell may have a different propagation delay to the UE. The UE may determine timing information based on the received signals and may report the timing information to one or more of the cells. The timing information may include a receive time of each cell at the UE. The UE may receive a data transmission from at least one cell, which can be selected from the plurality of cells, based on the timing information. The at least one cell may provide a coordinated or a non-coordinated data transmission. A coordinated transmission mode may be determined based on the timing information and can include, for example, a joint transmission, a coordinated beamforming, or a coordinated silencing.
대표청구항▼
1. A method for wireless communication, comprising: receiving at a user equipment (UE) signals from a plurality of cells available for coordinated multipoint (COMP) data transmissions to the UE, each of the plurality of cells associated with a separate base station; determining timing information fo
1. A method for wireless communication, comprising: receiving at a user equipment (UE) signals from a plurality of cells available for coordinated multipoint (COMP) data transmissions to the UE, each of the plurality of cells associated with a separate base station; determining timing information for the plurality of cells based on the received signals, the timing information comprising a receive time of each of the signals received from each of the plurality of cells, wherein the receive time of each of the signals received from each of the plurality of cells is within a timing window at the UE;determining the receive time of each of the signals received from each of the plurality of cells based on a first arriving path, or a strongest path, or a center of mass of a channel impulse response for a cell of the plurality of cells, wherein determining the timing information is based on the receive time of each of the signals received from each of the plurality of cells;sending the timing information for the plurality of cells; andreceiving a CoMP data transmission from a portion of the plurality of cells available for CoMP data transmissions to the UE, the portion selected to participate in the CoMP data transmission based on the timing information for each of the plurality of cells, wherein the CoMP data transmission is coordinated based on the receive time of each of the signals received from each of the selected cells. 2. The method of claim 1, wherein the CoMP data transmission comprises a joint transmission, a coordinated beamforming, or a coordinated silencing by cells in the plurality of cells. 3. The method of claim 1, wherein the CoMP data transmission is associated with a second data transmission from at least one other cell, the second data transmission comprising a coordinated beamforming based at least in part on the timing information. 4. The method of claim 3, wherein the receive time of a signal received from the at least one other cell is outside the timing window at the UE. 5. The method of claim 1, wherein the CoMP data transmission is associated with a coordinated silencing of at least one other cell in the plurality of cells, and wherein the coordinated silencing is based at least in part on the timing information. 6. The method of claim 1, wherein the timing information comprises an indication of whether the receive time of each of the signals received from each of the plurality of cells is within the timing window at the UE. 7. The method of claim 6, wherein the timing window has a width determined based on a cyclic prefix of the received signals of each of the signals received from each of the plurality of cells. 8. The method of claim 1, wherein the determining the timing information comprises determining a reference time, determining a time difference for each of the plurality of cells based on the receive time of each of the signals received from each of the plurality of cells and the reference time, and determining the timing information based on time differences for the plurality of cells. 9. The method of claim 8, wherein the determining the reference time comprises determining the reference time based on a first arriving path, or a strongest path, or a center of mass of a channel impulse response for a designated cell among the plurality of cells. 10. The method of claim 8, wherein the determining the reference time comprises determining the reference time based on a first arriving path, or a strongest path, or a center of mass of a composite channel impulse response for at least two cells among the plurality of cells. 11. The method of claim 1, further comprising: reporting the timing information to a serving cell of the plurality of cells participating in the CoMP data transmission. 12. The method of claim 1, further comprising: reporting channel state information for the plurality of cells by the UE for use for data transmission to the UE. 13. The method of claim 12, further comprising: generating a feedback report comprising the channel state information and the timing information for the plurality of cells; andsending the feedback report by the UE. 14. An apparatus for wireless communication at a UE, comprising: means for receiving signals from a plurality of cells available for coordinated multipoint (COMP) data transmissions, each of the plurality of cells associated with a separate base station;means for determining timing information for the plurality of cells based on the received signals, the timing information comprising a receive time of each of the signals received from each of the plurality of cells, wherein the receive time of each of the signals received from each of the plurality of cells is within a timing window at the UE;means for determining the receive time of each of the signals received from each of the plurality of cells based on a first arriving path, or a strongest path, or a center of mass of a channel impulse response for a cell of the plurality of cells, wherein determining the timing information is based on the receive time of each of the signals received from each of the plurality of cells;means for sending the timing information for the plurality of cells; andmeans for receiving a CoMP data transmission from a portion of the plurality of cells available for CoMP data transmissions to the UE, the portion selected to participate in the CoMP data transmission based on the timing information for each of the plurality of cells, wherein the CoMP data transmission is coordinated based on the receive time of each of the signals received from each of the selected cells. 15. The apparatus of claim 14, wherein the CoMP data transmission comprises a joint transmission, a coordinated beamforming, or a coordinated silencing by cells in the plurality of cells. 16. The apparatus of claim 14, wherein the means for determining the timing information comprises means for determining a reference time, means for determining a time difference for each of the plurality of cells based on the receive time of each of the signals received from each of the plurality of cells and the reference time, and means for determining the timing information based on time differences for the plurality of cells. 17. The apparatus of claim 14, further comprising: means for determining channel state information for the plurality of cells by the UE;means for generating a feedback report comprising the channel state information and the timing information for the plurality of cells; andmeans for sending the feedback report by the UE. 18. An apparatus for wireless communication at a UE, comprising: at least one processor configured to: receive signals from a plurality of cells available for coordinated multipoint (COMP) data transmissions, each of the plurality of cells associated with a separate base station;determine timing information for the plurality of cells based on the received signals, the timing information comprising a receive time of each of the signals received from each of the plurality of cells, wherein the receive time of each of the signals received from each of the plurality of cells is within a timing window at the UE;determine the receive time of each of the signals received from each of the plurality of cells based on a first arriving path, or a strongest path, or a center of mass of a channel impulse response for a cell of the plurality of cells, wherein the timing information is determined based on the receive time of each of the signals received from each of the plurality of cells;send the timing information for the plurality of cells; andreceive a CoMP data transmission from a portion of the plurality of cells available for CoMP data transmissions to the UE, the portion selected to participate in the CoMP data transmission based on the timing information for each of the plurality of cells, wherein the CoMP data transmission is coordinated based on the receive time of each of the signals received from each of the selected cells. 19. The apparatus of claim 18, wherein the CoMP data transmission comprises a joint transmission, a coordinated beamforming, or a coordinated silencing by cells in the plurality of cells. 20. The apparatus of claim 18, wherein the at least one processor is configured to: determine a reference time, determine a time difference for each of the plurality of cells based on the receive time of each of the signals received from each of the plurality of cells and the reference time, and determine the timing information based on time differences for the plurality of cells. 21. The apparatus of claim 18, wherein the at least one processor is configured to: determine channel state information for the plurality of cells by the UE, generate a feedback report comprising the channel state information and the timing information for the plurality of cells, and send the feedback report from the UE. 22. A computer program product, comprising: a non-transitory computer-readable medium comprising: code for causing at least one computer to receive signals from a plurality of cells available for coordinated multipoint (CoMP) data transmissions to a user equipment (UE), each of the plurality of cells associated with a separate base station;code for causing the at least one computer to determine timing information for the plurality of cells based on the received signals, the timing information comprising a receive time of each of the signals received from each of the plurality of cells, wherein the receive time of each of the signals received from each of the plurality of cells is within a timing window at the UE;code for causing the at least one computer to determine the receive time of each of the signals received from each of the plurality of cells based on a first arriving path, or a strongest path, or a center of mass of a channel impulse response for a cell of the plurality of cells, wherein the timing information is determined based on the receive time of each of the signals received from each of the plurality of cells; code for causing the at least one computer to report the timing information for the plurality of cells by the UE; andcode for causing the at least one computer to receive a CoMP data transmission from a portion of the plurality of cells available for CoMP data transmissions to the UE, the portion selected to participate in the CoMP data transmission based on the timing information for each of the plurality of cells, wherein the CoMP data transmission is coordinated based on the receive time of each of the signals received from each of the selected cells. 23. A method for wireless communication, comprising: receiving timing information for a plurality of cells from a user equipment (UE), each of the plurality of cells available for coordinated multipoint (CoMP) data transmission to the UE and being associated with a separate base station, the timing information comprising a receive time of each signal received by the UE from each of the plurality of cells, wherein the receive time of each of the signals received by the UE from each of the plurality of cells is within a timing window at the UE, wherein the receive time of each of the signals received by the UE from the plurality of cells is based on a first arriving path, or a strongest path, or a center of mass of a channel impulse for a cell of the plurality of cells, and wherein the timing information is based on the receive time of each of the signals received by the UE from each of the plurality of cells;selecting a portion of the plurality of cells available for CoMP data transmissions to the UE based on the timing information for each of the plurality of cells;determining a CoMP data transmission, the CoMP data transmission coordinated based on the receive time of each of the signals received by the UE from each of the plurality of cells; andcoordinating with the portion of the plurality of cells to transmit the CoMP data transmission to the UE from the portion of the plurality of cells. 24. The method of claim 23, further comprising determining a coordinated transmission mode for the UE based on the timing information. 25. The method of claim 24, wherein the coordinated transmission mode comprises a joint transmission, a coordinated beamforming, or a coordinated silencing by cells in the plurality of cells. 26. The method of claim 23, wherein the receive time of each of the signals received by the UE from each of the plurality of cells selected to participate in the CoMP data transmission is within the timing window at the UE. 27. The method of claim 23, further comprising: determining at least one cell in the plurality of cells to perform a coordinated silencing for the UE. 28. The method of claim 23, further comprising: determining whether the receive time of each of the signals received by the UE from each of the plurality of cells is within the timing window at the UE; andselecting the portion of the plurality of cells to participate in the CoMP data transmission from among cells having receive times of signals received by the UE within the timing window. 29. The method of claim 23, further comprising: obtaining a time difference for each of the plurality of cells from the timing information, the time difference for each cell being determined based on the receive time of each of the signals received by the UE from each of the plurality of cells and a reference time, and selecting the portion of the plurality of cells to participate in the CoMP data transmission based at least on the time differences. 30. The method of claim 23, further comprising: receiving channel state information for the plurality of cells from the UE, and wherein the sending the CoMP data transmission comprises sending the CoMP data transmission from the portion of the plurality of cells based on the channel state information. 31. An apparatus for wireless communication, comprising: means for receiving timing information for a plurality of cells from a user equipment (UE), each of the plurality of cells available for coordinated multipoint (CoMP) data transmission to the UE and being associated with a separate base station, the timing information comprising a receive time of each signal received by the UE from each of the plurality of cells, wherein the receive time for each of the plurality of cells is within a timing window at the UE, wherein the receive time of each of the signals received by the UE from the plurality of cells is based on a first arriving path, or a strongest path, or a center of mass of a channel impulse for a cell of the plurality of cells, and wherein the timing information is based on the receive time of each of the signals received by the UE from each of the plurality of cells;means for selecting a portion of the plurality of cells available for CoMP data transmission to the UE based on the timing information for each of the plurality of cells;means for determining a CoMP data transmission, the CoMP data transmission coordinated based on the receive time of each of the signals received by the UE from each of the plurality of cells; andmeans for coordinating with the portion of the plurality of cells to transmit the CoMP data transmission to the UE from the portion of the plurality of cells. 32. The apparatus of claim 31, further comprising: means for determining a coordinated transmission mode for the UE based on the timing information. 33. The apparatus of claim 32, wherein the coordinated transmission mode comprises a joint transmission, a coordinated beamforming, or a coordinated silencing by cells in the plurality of cells. 34. The apparatus of claim 31, further comprising: means for determining whether the receive time of each of the signals received by the UE from each of the plurality of cells is within the timing window at the UE based on the timing information, and means for selecting the portion of the plurality of cells to participate in the CoMP data transmission from among cells having receive times of signals received by the UE within the timing window. 35. The apparatus of claim 31, further comprising: means for obtaining a time difference for each of the plurality of cells from the timing information, the time difference for each cell being determined based on the receive time of each of the signals received by the UE from each of the plurality of cells and a reference time, and means for selecting the portion of the plurality of cells to participate in the CoMP data transmission based at least on the time differences. 36. The apparatus of claim 31, further comprising: means for receiving channel state information for the plurality of cells from the UE, and wherein the means for sending the CoMP data transmission comprises means for sending the CoMP data transmission from the portion of the plurality of cells based on the channel state information. 37. An apparatus for wireless communication, comprising: at least one processor configured to: receive timing information for a plurality of cells from a user equipment (UE), each of the plurality of cells available for coordinated multipoint (COMP) data transmission to the UE and being associated with a separate base station, the timing information comprising a receive time of each signal received by the UE from each of the plurality of cells, wherein the receive time of each of the signals received by the UE from each of the plurality of cells is within a timing window at the UE, wherein the receive time of each of the signals received by the UE from the plurality of cells is based on a first arriving path, or a strongest path, or a center of mass of a channel impulse for a cell of the plurality of cells, and wherein the timing information is based on the receive time of each of the signals received by the UE from each of the plurality of cells;select a portion of the plurality of cells available for CoMP data transmission to the UE based on the timing information for each of the plurality of cells;determine a CoMP data transmission, the CoMP data transmission coordinated based on the receive time of each of the signals received by the UE from each of the plurality of cells; andcoordinate with the portion of the plurality of cells to transmit the CoMP data transmission to the UE from the portion of the plurality of cells. 38. The apparatus of claim 37, wherein the at least one processor is configured to determine a coordinated transmission mode for the UE based on the timing information. 39. The apparatus of claim 38, wherein the coordinated transmission mode comprises a joint transmission, a coordinated beamforming, or a coordinated silencing by cells in the plurality of cells. 40. The apparatus of claim 37, wherein the at least one processor is configured to: determine whether the receive time of each of the signals received by the UE from each of the plurality of cells is within the timing window at the UE based on the timing information, and select the portion of the plurality of cells from among all cells having receive times within the timing window. 41. The apparatus of claim 37, wherein the at least one processor is configured to: obtain a time difference for each of the plurality of cells from the timing information, the time difference for each cell being determined based on the receive time of each of the signals received by the UE from each of the plurality of cells and a reference time, and select the portion of the plurality of cells to participate in the CoMP data transmission based at least on the time differences. 42. The apparatus of claim 37, wherein the at least one processor is configured to: receive channel state information for the plurality of cells from the UE, and send the CoMP data transmission from the portion of the plurality of cells based on the channel state information. 43. A computer program product, comprising: a non-transitory computer-readable medium comprising: code for causing at least one computer to receive timing information for a plurality of cells from a user equipment (UE), each of the plurality of cells available for coordinated multipoint (COMP) data transmission to the UE and being associated with a separate base station, the timing information comprising a receive time of each signal received by the UE from each of the plurality of cells, wherein the receive time of each of the signals received by the UE from each of the plurality of cells is within a timing window at the UE, wherein the receive time of each of the signals received by the UE from the plurality of cells is based on a first arriving path, or a strongest path, or a center of mass of a channel impulse for a cell of the plurality of cells, and wherein the timing information is based on the receive time of each of the signals received by the UE from each of the plurality of cells;code for causing the at least one computer to select a portion of the plurality of cells available for CoMP data transmissions to the UE based on the timing information for each of the plurality of cells;code for causing the at least one computer to determine a CoMP data transmission, the CoMP data transmission coordinated based on the receive time of each of the signals received by the UE from each of the plurality of cells; and code for causing the at least one computer to coordinate with the portion of the plurality of cells to transmit the CoMP data transmission to the UE from the portion of the plurality of cells.
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이 특허에 인용된 특허 (4)
Padovani, Roberto; Bender, Paul E.; Black, Peter J.; Grob, Matthew S.; Hinderling, Jurg K.; Sindhushayana, Nagabhushana T.; Wheatley, III, Charles E., Method and apparatus for high rate packet data transmission.
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