Analog Precoder Indication for Multi-Port Reference Signals
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, face limitations in transmitting multi-port reference signals (RS) due to restrictions on wideband digital precoding, which can hinder optimal MIMO operation and data rate enhancement.
Innovation Solution
The system allows for the transmission of multi-port RS with no restriction on wideband digital precoding by indicating the analog precoder used for transmission, enabling the selection of optimal multi-beam combinations for higher rank MIMO operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If restrictions on wideband digital precoding are imposed, then system complexity is reduced, but MIMO operation performance and data rate enhancement are limited
Solution Approach 1:
The patent introduces an intermediary mechanism where the transmitting node indicates the analog precoder used for transmission, allowing the receiving node to properly process the multi-port reference signal. This intermediary indication mechanism enables unrestricted wideband digital precoding while maintaining system manageability through standardized signaling protocols.
Solution Approach 2:
The patent changes the parameter state from restricted precoding configurations to unrestricted wideband digital precoding by introducing analog precoder indication as a new control parameter. This parameter change enables higher rank MIMO operation and improved data rate enhancement while the indication mechanism ensures proper signal processing at the receiver.
2Productivity
If unrestricted wideband digital precoding is used, then MIMO operation and data rate enhancement are improved, but system complexity increases
Solution Approach 1:
The indication of analog precoder serves as an intermediary that bridges the complexity of unrestricted precoding with standardized system processing. It allows the system to benefit from advanced precoding techniques while maintaining compatibility with existing receiver architectures through defined signaling mechanisms.
Solution Approach 2:
The patent segments the precoding function into analog precoding (indicated) and digital precoding (unrestricted) components. This segmentation allows each component to be optimized independently, with the analog precoder providing beamforming capabilities and the digital precoder enabling flexible MIMO operation, thereby managing overall system complexity.
3Device complexity
If multi-port reference signal transmission is performed without analog precoder indication, then device complexity is reduced, but CSI reporting accuracy deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the transmitting node indicates the analog precoder used for transmission to the receiving node. This feedback information enables the receiving node to accurately process the multi-port reference signal and generate precise channel state information reports, significantly improving CSI reporting accuracy.
Solution Approach 2:
The analog precoder indication acts as an intermediary parameter that mediates between the transmission and reception processes. It provides the receiving node with the necessary information to correctly interpret the reference signal, thereby improving measurement precision without requiring complex processing at the transmitter.
Data Source
AI summary
Aspects described herein relate to transmitting, for a receiving node, a multi-port reference signal (RS) with no restriction on wideband digital precoding, and transmitting, for the receiving node, an indication of an analog precoder used for transmitting the multi-port RS. Other aspects relate to receiving the multi-port RS and indication of analog precoder.