Systems and Methods of Wireless Communication with Remote Radio Heads
First Claim
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1. A method for communication in a telecommunications cell, comprising:
- a macro-eNB transmitting a user equipment (UE)-specific sounding reference signal (SRS) to a specific UE in the cell over at least one transmission point (TP); and
the UE receiving the UE-specific SRS, measuring the UE-specific SRS, and feeding back to the macro-eNB information about a downlink channel from the TP to the UE, the information being based on the measurement.
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Abstract
A method for communication in a telecommunications cell is provided. The method includes a macro-eNB transmitting a UE-specific SRS to a specific UE in the cell over at least one TP. The method further includes the UE receiving the UE-specific SRS, measuring the UE-specific SRS, and feeding back to the macro-eNB information about a downlink channel from the TP to the UE, the information being based on the measurement.
130 Citations
42 Claims
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1. A method for communication in a telecommunications cell, comprising:
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a macro-eNB transmitting a user equipment (UE)-specific sounding reference signal (SRS) to a specific UE in the cell over at least one transmission point (TP); and the UE receiving the UE-specific SRS, measuring the UE-specific SRS, and feeding back to the macro-eNB information about a downlink channel from the TP to the UE, the information being based on the measurement. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A transmission point (TP), comprising:
a processor configured such that the TP transmits to a specific user equipment (UE) a UE-specific sounding reference signal (SRS) that the UE can measure in order to determine and feed back to a macro-eNB information about a downlink channel from the TP to the UE. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A user equipment (UE), comprising:
a processor configured such that the UE receives from a transmission point (TP) a UE-specific sounding reference signal (SRS), the processor further configured such that the UE determines information about a downlink channel from the TP to the UE based on the UE-specific SRS, the processor further configured such that the UE feeds the information back to a macro-eNB. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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26. A method for communication in a telecommunications cell, comprising:
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a user equipment (UE) in the cell receiving from at least one transmission point (TP) out of a plurality of TPs in the cell a set of channel state information reference signals (CSI-RS), wherein each TP has a unique set of CSI-RS; the UE providing to a macro-eNB in the cell downlink channel information regarding at least one of the TPs based on the set of CSI-RS. - View Dependent Claims (27, 28, 29, 30, 31, 32)
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33. A user equipment (UE), comprising:
a processor configured such that the UE receives from at least one transmission point (TP) out of a plurality of TPs in the same cell a set of channel state information reference signals (CSI-RS), wherein each TP has a unique set of CSI-RS, the processor further configured such that the UE provides to a macro-eNB in the cell downlink channel information regarding at least one of the TPs based on the set of CSI-RS. - View Dependent Claims (34, 35, 36, 37)
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38. A transmission point (TP), comprising:
a processor configured such that the TP transmits to a user equipment (UE) a first set of channel state information reference signals (CSI-RS), wherein the first set of CSI-RS is different from a second set of CSI-RS of another TP in the cell, and wherein the first set of CSI-RS is usable for providing to a macro-eNB in the cell downlink channel information regarding the TP. - View Dependent Claims (39, 40)
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41. A method for determining which transmission points (TPs) are to be used for downlink data transmission to a user equipment (UE), comprising:
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a macro-eNB measuring the strength of uplink signals received from the UE by a plurality of TPs; the macro-eNB estimating a downlink signal strength from each of the plurality of TPs to the UE based on the uplink signal strengths and the transmit powers of the plurality of TPs; the macro-eNB using the estimated downlink signal strengths to determine a set of candidate TPs; the macro-eNB requesting the UE to feedback downlink channel information on each of the candidate TPs based on downlink reference signals transmitted from the TPs; the macro-eNB receiving feedback from the UE regarding downlink channel information on the TPs; and the macro-eNB determining or updating from the feedback which TPs are to be used for downlink data transmission to the UE.
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42. A macro-eNB, comprising:
a processor configured such that the macro-eNB measures the strength of uplink signals received from a user equipment (UE) by a plurality of transmission points (TPs), further configured such that the macro-eNB estimates a downlink signal strength from each of the plurality of TPs to the UE based on the uplink signal strengths and the transmit powers of the plurality of TPs, further configured such that the macro-eNB uses the estimated downlink signal strengths to determine a set of candidate TPs, further configured such that the macro-eNB requests the UE to feedback downlink channel information on each of the candidate TPs based on downlink reference signals transmitted from the TPs, further configured such that the macro-eNB receives feedback from the UE regarding downlink channel information on the TPs, and further configured such that the macro-eNB determines or updates from the feedback which TPs are to be used for downlink data transmission to the UE.
Specification