Orthogonal Basis Vector Index Determination for CSI Feedback
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Solution Overview
Problem
The existing methods for orthogonal basis vector feedback in Type II channel state information (CSI) feedback result in relatively large feedback overheads, which is a challenge in wireless communication systems.
Innovation Solution
A method is provided to determine an index of an orthogonal basis vector, where position information associated with the vector is received and used to determine a first index set representing the column indices of a plurality of orthogonal basis vectors in an orthogonal basis matrix, thereby reducing feedback overheads. This method can be implemented in both network devices and terminals, and involves processing and transmitting specific position information to facilitate efficient feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If traditional orthogonal basis vector feedback methods are used in Type II CSI feedback, then the feedback information is complete, but the feedback overhead becomes relatively large
Solution Approach 1:
The patent extracts only the essential position information (row index and column index) from the complete orthogonal basis vector feedback, separating the critical identification data from the redundant vector data. This allows the network device to reconstruct or identify the basis vectors using minimal feedback overhead while maintaining information completeness.
Solution Approach 2:
The patent segments the orthogonal basis vector feedback into distinct components: row index information, column index information, and optional coefficient information. This segmentation allows selective transmission of only necessary elements, reducing overall feedback overhead while preserving the ability to reconstruct complete vector information at the receiver.
2Quantity of substance
If position information is transmitted to determine orthogonal basis vector indices, then feedback overhead is reduced, but the method complexity increases
Solution Approach 1:
The patent enables the network device to self-determine the orthogonal basis vector indices using the transmitted position information and pre-stored basis matrix information. The network device performs the index determination autonomously without requiring additional signaling or complex coordination, reducing overall system complexity despite the position-based approach.
3Productivity
If only necessary indices are determined and transmitted, then feedback efficiency is improved, but measurement precision requirements increase
Solution Approach 1:
The patent uses position information (indices) as a simplified copy or reference to the complete orthogonal basis vectors. Instead of transmitting the full vector data, the system transmits compact index copies that point to the actual vectors stored at the network device, achieving high feedback efficiency while maintaining precision through accurate index mapping.
Data Source
AI summary
Some embodiments of this disclosure provide a method for determining an index of an orthogonal basis vector and a device. The method includes: receiving position information, where the position information is associated with an orthogonal basis vector; and determining at least one first index set based on the position information, where the first index set represents a set of column indices of a plurality of orthogonal basis vectors in an orthogonal basis matrix.