Terminal CSI Parameter Mapping for Multi-TRP Coherent Transmission
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Solution Overview
Problem
Existing radio communication systems, particularly in next-generation mobile communication systems like NR, face challenges in accurately reporting channel state information (CSI) for terminals moving at high speeds, leading to deteriorated communication throughput and quality due to insufficient CSI/codebook definitions.
Innovation Solution
A terminal equipped with a receiving section to receive indices for CSI reporting from multiple transmission/reception points (TRPs) and a control section to determine parameters for coherent joint transmission, including the number of beams, frequency domain discrete Fourier transform vectors, and CSI-reference signal ports, enabling appropriate CSI reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CSI reporting methods are not clearly defined for high-speed terminals, then communication performance cannot be optimized, but communication throughput and quality deteriorate
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting CSI reporting parameters (such as reporting periodicity, frequency domain granularity, and parameter combinations) based on terminal speed conditions. When a terminal is identified as high-speed, the system modifies CSI reporting parameters to maintain accurate channel state information despite rapid channel variations, thereby preventing throughput deterioration while ensuring communication quality.
Solution Approach 2:
The patent implements dynamics by making CSI reporting adaptive to terminal mobility conditions. The system continuously monitors terminal speed and dynamically adjusts CSI reporting configurations in real-time. This dynamic adaptation ensures that CSI reporting remains appropriate for the current channel conditions, preventing both information loss and unnecessary overhead that would harm throughput.
2Device complexity
If CSI reporting overhead is reduced for high-speed terminals, then signaling complexity decreases, but measurement precision and communication quality deteriorate
Solution Approach 1:
The patent applies local quality by differentiating CSI reporting configurations based on specific terminal conditions (speed, mobility pattern). Instead of using a uniform CSI reporting scheme for all terminals, the system tailors reporting parameters locally to each terminal's characteristics. This ensures that high-speed terminals receive appropriate CSI reporting configurations that maintain accuracy without unnecessarily increasing overhead for other terminals.
Solution Approach 2:
The patent uses parameter changes to adjust CSI reporting based on terminal speed. By modifying reporting parameters such as periodicity, subband size, and parameter combinations according to terminal mobility, the system achieves accurate CSI measurement for high-speed terminals while controlling overall signaling overhead through selective parameter adjustment rather than blanket increases.
3Measurement precision
If CSI reporting frequency is increased for high-speed terminals, then channel state information accuracy improves, but signaling overhead and resource consumption increase
Solution Approach 1:
The patent implements dynamics by making CSI reporting frequency adaptive rather than static. The system adjusts reporting frequency based on terminal speed and channel variation rates. For high-speed terminals experiencing rapid channel changes, reporting frequency is increased to maintain accuracy. For stationary or low-speed terminals, reporting frequency is reduced to minimize overhead, achieving a dynamic balance between accuracy and resource consumption.
Solution Approach 2:
The patent applies parameter changes by modifying CSI reporting configurations (periodicity, frequency domain granularity, parameter combinations) based on terminal conditions. This selective parameter adjustment ensures that increased reporting frequency and enhanced accuracy are applied only when necessary (for high-speed terminals), rather than universally, thereby controlling overall signaling overhead while maintaining accuracy where needed.
Data Source
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Figure 3A~3B
AI summary
A terminal according to one aspect of the present disclosure includes: a receiving section that receives an index for channel state information (CSI) reporting of multiple transmission/reception points (TRPs) to be used for coherent joint transmission (CJT); and a control section that determines, based on the index, multiple values of one parameter among a first parameter related to the number of beams, a second parameter to be used for calculation of the number of frequency domain discrete Fourier transform (DFT) vectors, and a third parameter to be used for calculation of the number of selected CSI-reference signal (RS) ports, the multiple values corresponding to the multiple respective TRPs. According to one aspect of the present disclosure, it is possible to appropriately report CSI.