CSI Report Segmentation for Accurate Channel State Determination
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Solution Overview
Problem
In wireless communications, network devices struggle to accurately determine channel state information (CSI) due to incomplete CSI reports caused by terminal discarding of subband CSI information, leading to performance deterioration in Fourier transform-based compressed codebooks.
Innovation Solution
A method where non-zero quantized coefficients and bitmaps in CSI reports are divided into information groups and prioritized for discarding, allowing the network device to receive and parse the CSI report based on preset priority information, ensuring accurate channel state determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the terminal discards subband CSI information to ensure the CSI report fits in the allocated PUSCH resource, then the resource allocation constraint is satisfied, but the network device cannot determine the discarded CSI content, leading to inaccurate channel state determination
Solution Approach 1:
The patent segments the quantized coefficients in the compressed codebook into multiple groups, where each group corresponds to specific subbands. This segmentation allows the network device to understand which specific subband CSI information is present or discarded, resolving the information loss problem while maintaining resource constraints.
Solution Approach 2:
The patent introduces a bitmap that is generated in advance to indicate the presence or absence of quantized coefficients for different subbands. This preliminary action enables the network device to know beforehand which CSI information will be transmitted and which will be discarded, allowing accurate channel state determination even when some information is omitted.
2Measurement precision
If the terminal transmits complete CSI report content, then the CSI feedback accuracy is improved, but the PUSCH resource allocated by the network device cannot accommodate all content
Solution Approach 1:
The patent extracts only the essential quantized coefficients that need to be transmitted by setting corresponding bits in the bitmap to indicate their presence. Non-essential coefficients are excluded from transmission, allowing the CSI report to fit within resource constraints while maintaining necessary feedback accuracy.
Solution Approach 2:
The patent changes the parameter representation by introducing a bitmap structure that efficiently encodes the presence/absence of different CSI components. This parameter change allows the system to dynamically adjust the amount of transmitted information based on resource availability while maintaining the ability to reconstruct accurate channel state information.
3Loss of information
If the network device allocates sufficient PUSCH resource to accommodate complete CSI report, then the CSI report completeness is improved, but the resource allocation efficiency decreases when complete CSI is not needed
Solution Approach 1:
The patent introduces dynamic adaptability through the bitmap mechanism, allowing the terminal to dynamically adjust the amount of CSI information transmitted based on channel conditions, buffer status, and resource availability. This dynamic approach optimizes the balance between information completeness and resource consumption.
Solution Approach 2:
The patent enables flexible parameter adjustment by using the bitmap to control which quantized coefficients are transmitted. The network device can configure the bitmap size and structure to match the actual CSI feedback needs, avoiding unnecessary resource consumption while ensuring required information is transmitted.
Data Source
AI summary
A method for transmitting a channel state information CSI report, a terminal, and a network device are provided. The method for transmitting a CSI report is applied to a terminal side and includes: dividing non-zero quantized coefficients in a compressed coefficient matrix and a bitmap indicating the quantized coefficients into a plurality of information groups; discarding, based on priority information preset for information groups, at least one of the following information in the CSI report: the quantized coefficients and the bitmap; and transmitting the CSI report with the information discarded.