User equipment generation and signaling of feedback for supporting adaptive demodulation reference signal transmission

摘要

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.

主权项

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 by quantizing the multipath-time delay and Doppler spreads according to a set of finite levels corresponding to predefined DMRS patterns 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; andobtain 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.