CSI Feedback Method Using Priority-Based Coefficient Selection
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Solution Overview
Problem
In Massive MIMO technology, terminal devices face challenges in reporting channel state information (CSI) due to insufficient uplink resources, which limits the effective use of limited physical uplink resources without increasing the complexity of the terminal device.
Innovation Solution
A channel information feedback method that generates and sends first indication information based on a received precoded reference signal, using a preset priority rule to determine complex coefficients from a complex coefficient set, thereby efficiently reporting CSI using limited uplink resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the terminal device reports all K complex coefficients, then the CSI reporting accuracy is improved, but the uplink resource consumption increases
Solution Approach 1:
The patent extracts only the most significant complex coefficients from the complete set of K coefficients based on amplitude magnitude and port priority. The terminal device identifies and reports only B coefficients (where B<K) that contribute most to channel state accuracy, discarding less significant coefficients to reduce uplink resource consumption while maintaining acceptable CSI reporting accuracy.
Solution Approach 2:
Instead of reporting all K complex coefficients, the patent applies partial action by reporting only a subset B of the most important coefficients. This partial reporting strategy reduces the reporting overhead to fit limited uplink resources while still capturing the essential channel state information needed for effective precoding.
2Quantity of substance
If the terminal device uses a priority rule to select fewer complex coefficients, then the uplink resource usage is reduced, but the CSI reporting accuracy may deteriorate
Solution Approach 1:
The patent applies local quality by differentiating between complex coefficients based on their individual characteristics. Coefficients are prioritized according to their amplitude magnitude and the importance of their corresponding reference signal ports. This selective prioritization ensures that resources are allocated to report the most significant coefficients first, maintaining CSI accuracy while reducing overall reporting overhead.
Solution Approach 2:
The patent changes the parameter of coefficient selection from reporting all coefficients to reporting a prioritized subset. By introducing amplitude-based ranking and port priority as selection criteria, the system transforms the reporting process to focus on quality over quantity, ensuring that limited uplink resources carry the most valuable channel state information.
3Loss of information
If the terminal device implements complex coefficient prioritization, then the reporting overhead is reduced, but the device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-defining priority rules for complex coefficient selection based on reference signal port configurations and coefficient characteristics. These priority rules are established in advance through network configuration, allowing the terminal device to simply follow the predefined rules rather than performing complex real-time analysis, thus reducing both reporting overhead and processing complexity.
Solution Approach 2:
The terminal device performs self-service by autonomously ranking and selecting its own complex coefficients based on amplitude magnitude and configured priority rules. This self-selection process eliminates the need for extensive network-side processing or complex coordination, reducing overall system complexity while achieving efficient overhead reduction.
Data Source
AI summary
This application provides a channel state information (CSI) feedback method including: a communication apparatus receives first indication information, wherein the first indication information is determined based on a received precoded reference signal corresponds to P reference signal ports; the first indication information indicates B complex coefficients determined from K complex coefficients according to a preset priority value, the K complex coefficients are determined from a complex coefficient set comprising U complex coefficients that are determined for an sth reference signal port in S reference signal ports at each transport layer of Z transport layers, the S reference signal ports are a part or all of the P reference signal ports, the U complex coefficients are a part or all of Ts complex coefficients corresponding to the sth reference signal port; and determines a precoding matrix based on the first indication information.