USER EQUIPMENT GENERATION AND SIGNALING OF FEEDBACK FOR SUPPORTING ADAPTIVE DEMODULATION REFERENCE SIGNAL TRANSMISSION
First Claim
Patent Images
1. A user equipment (UE) to support adaptive demodulation reference signal (DMRS) transmission in a wireless communication downlink channel of a long term evolution (LTE) wireless network, the UE comprising:
- a receiver configured to receive from an evolved node b (eNB) a request for feedback of multipath-time delay and Doppler spreads estimated in the wireless communication downlink channel between the UE and eNB;
a transmitter; and
circuitry operatively coupled to the receiver and transmitter, the circuitry configured to;
estimate the multipath-time delay and Doppler spreads to establish the feedback of multipath-time delay and Doppler spreads;
in response to the receiver receiving the request, cause the transmitter to transmit the feedback of multipath-time delay and Doppler spreads; and
obtain with the receiver, a DMRS pattern configuration from the eNB, the DMRS configuration being based on the feedback of multipath-time delay and Doppler spreads.
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Abstract
Disclosed are UE-feedback techniques to support the adaptive DMRS transmission. A UE and eNB support adaptive DMRS transmission in which an eNB adjusts (i.e., selects) a DMRS pattern based on information describing channel conditions perceived by the UE. The UE may explicitly provide the channel conditions, or implicitly provide them by selecting a desired DMRS pattern.
48 Citations
21 Claims
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1. A user equipment (UE) to support adaptive demodulation reference signal (DMRS) transmission in a wireless communication downlink channel of a long term evolution (LTE) wireless network, the UE comprising:
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a receiver configured to receive from an evolved node b (eNB) a request for feedback of multipath-time delay and Doppler spreads estimated in the wireless communication downlink channel between the UE and eNB; a transmitter; and circuitry operatively coupled to the receiver and transmitter, the circuitry configured to; estimate the multipath-time delay and Doppler spreads to establish the feedback of multipath-time delay and Doppler spreads; in response to the receiver receiving the request, cause the transmitter to transmit the feedback of multipath-time delay and Doppler spreads; and obtain with the receiver, a DMRS pattern configuration from the eNB, the DMRS configuration being based on the feedback of multipath-time delay and Doppler spreads. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A user equipment (UE) to signal a desired demodulation reference signal (DMRS) pattern identified from among a predefined set of DMRS patterns associated with a downlink channel of a long term evolution (LTE) wireless network, the UE comprising:
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a receiver to receive from an evolved node b (eNB) a request for a DMRS indicator (DI) feedback identifying the desired DMRS pattern from among the predefined set of DMRS patterns; a transmitter; and circuitry operatively coupled to the receiver and transmitter, the circuitry configured to; obtain estimates of long-term channel properties defined by multipath-time delay and Doppler spreads; and select a desired DMRS pattern from among the predefined set of DMRS patterns based on the multipath-time delay and Doppler spreads; and in response to receiving the request, cause the transmitter to transmit to the eNB the DI feedback identifying the desired DMRS pattern from among the predefined set of DMRS patterns. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. An evolved node b (eNB) configured to select, and transmit to a user equipment (UE), a demodulation reference signal (DMRS), the eNB comprising:
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a transmitter configured to transmit a request for adaptive DMRS feedback; a receiver configured to receive from the UE the adaptive DMRS feedback; and circuitry configured to; determine, based on the adaptive DMRS feedback, a DMRS pattern from among a predefined set of DMRS patterns; signal the determined DMRS pattern to the UE; and cause the transmitter to transmit the DMRS during a physical downlink shared channel (PDSCH) transmission. - View Dependent Claims (17, 18, 19, 20, 21)
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Specification