CSI Feedback Precoding for Higher-Throughput PDSCH Transmission
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Solution Overview
Problem
Existing wireless communication systems face challenges in maximizing data throughput through precoding methods, particularly in millimeter wave bands, where signal attenuation is significant, and existing precoders do not fully optimize channel capacity.
Innovation Solution
A wireless communication device and method that utilizes CSI feedback to generate and apply precoders based on the relationship between SRS and CSI-RS, enabling higher resolution precoding and beamforming gains, thereby optimizing channel capacity and throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If codebook-based precoders are used, then device complexity is reduced and ease of operation is improved, but data throughput and channel capacity are limited
Solution Approach 1:
The patent changes the parameter of precoding resolution from standard codebook-based precision to higher resolution by utilizing the relationship between SRS and CSI-RS. The UE measures the channel using both SRS and CSI-RS, then determines a higher resolution precoder by combining measurements from both reference signals, thereby increasing data throughput while managing complexity through efficient measurement utilization.
Solution Approach 2:
The patent introduces an intermediary approach by using SRS measurements as an additional channel estimation resource alongside CSI-RS. The UE combines information from both SRS and CSI-RS to derive higher resolution precoding information, effectively using SRS as a mediator to enhance precoding accuracy without relying solely on codebook-based methods.
2Measurement precision
If higher resolution precoders are applied, then channel capacity and beamforming gains are maximized, but measurement and detection difficulty increases
Solution Approach 1:
The patent merges measurements from two different reference signals (SRS and CSI-RS) to achieve higher resolution channel estimation. The UE measures the channel using both SRS and CSI-RS, then combines these measurements to determine a higher resolution precoder, thereby improving measurement precision while distributing the measurement burden across multiple reference signals.
Solution Approach 2:
The patent performs preliminary channel measurements using SRS before final precoder determination. By measuring the channel using both SRS and CSI-RS in advance, the UE prepares high-precision channel state information that facilitates subsequent higher resolution precoder calculation, reducing the complexity of real-time precise measurement.
3Productivity
If SRS-based precoding is used, then data throughput is increased, but signal attenuation in millimeter wave bands remains significant
Solution Approach 1:
The patent changes the precoding parameter resolution to higher levels by utilizing both SRS and CSI-RS measurements. This higher resolution precoding enables more accurate beamforming that can better counteract signal attenuation in millimeter wave bands, thereby maintaining increased data throughput despite the harsh propagation conditions.
Solution Approach 2:
The patent creates a composite channel estimation approach by combining information from SRS and CSI-RS. This composite measurement method leverages the strengths of both reference signals to generate more robust precoding information that can better compensate for millimeter wave signal attenuation, improving throughput resilience.
Data Source
AI summary
A operating method of a wireless communication device includes transmitting a sounding reference signal (SRS) to a base station; receiving, from the base station, a first reference signal to which a second precoder is applied; generating feedback information including at least one of a rank indicator (RI) and a channel quality indicator (CQI), based on at least one of: (i) a relationship between the second precoder and a first precoder applied to a first physical downlink shared channel (PDSCH) by the base station based on the SRS; and (ii) a channel estimated by using the first reference signal; transmitting the generated feedback information to the base station; and receiving a second PDSCH to which at least one of the first precoder, the RI, and the CQI is applied.