UE-Specific Reference Signal for Accurate Channel Feedback
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Solution Overview
Problem
In existing wireless communication systems, errors in channel state estimation and feedback can lead to suboptimal communication resource scheduling and modulation coding schemes, resulting in significant deviations between actual and estimated transmission results at the base station.
Innovation Solution
A wireless communication device and method that estimates an equivalent channel based on a user equipment specific reference signal from a base station and generates a channel state indication for feedback, allowing the base station to adjust communication resource scheduling, multi-antenna precoding mode, and modulation coding schemes more accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If channel state estimation is performed using cell reference signal and channel state information reference signal, then the base station can obtain channel information, but errors in estimation and feedback cause deviation between actual transmission and estimated result
Solution Approach 1:
The patent implements a feedback mechanism where the user equipment estimates the equivalent channel based on the precoded user equipment specific reference signal and feeds back channel state information to the base station. This feedback loop allows the base station to adjust its precoding and resource allocation based on actual channel conditions, reducing the deviation between estimated and actual transmission results.
Solution Approach 2:
The patent introduces a user equipment specific reference signal as an intermediary element that carries precoding information. This reference signal serves as a mediator between the base station's precoding operation and the user equipment's channel estimation, enabling more accurate equivalent channel estimation by incorporating the actual precoding applied to the data transmission.
2Device complexity
If user equipment specific reference signal is used for downlink demodulation only, then the system maintains simplicity, but channel quality feedback accuracy is insufficient for optimal resource scheduling
Solution Approach 1:
The patent makes the user equipment specific reference signal multi-functional by using it both for downlink demodulation and for channel state estimation. This universal usage of the same reference signal structure achieves improved channel quality feedback accuracy without significantly increasing system complexity, as the same signal serves dual purposes.
Solution Approach 2:
The patent changes the parameter usage of the user equipment specific reference signal by applying precoding to it and using it for equivalent channel estimation. This parameter change transforms the reference signal from a simple demodulation aid into a comprehensive channel characterization tool, improving feedback accuracy while maintaining the same basic signal structure.
Data Source
AI summary
A wireless communication device and a wireless communication method. The wireless communication device includes one or more processors. The processor is configured to estimate an equivalent channel from a base station to user equipment based on a user equipment specific reference signal from the base station, and generate, according to the estimated equivalent channel, a channel state indication used to be fed back to the base station.