CSI Reporting With Fine-Grained FD Compensation for Joint Transmission
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Solution Overview
Problem
Existing wireless communication systems face interference challenges that degrade performance due to increased demand for mobile broadband access, particularly in networks with multiple access points, leading to congested conditions and reduced reliability of channel state information reporting.
Innovation Solution
Implementing coherent joint transmission (CJT) with frequency domain compensation at a finer than subband size level for channel state information (CSI) reporting, which involves determining CSI parameters, identifying a reference TRP, calculating frequency domain compensation quantities, and transmitting compensated precoders to improve reporting accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If coherent joint transmission with frequency domain compensation at finer than subband size level is implemented, then CSI reporting accuracy is improved, but device complexity increases
Solution Approach 1:
The frequency domain is segmented into multiple compensation units, each with its own compensation value. This allows fine-grained frequency domain compensation to be applied at a granularity finer than subband level, improving CSI accuracy while managing complexity through structured segmentation of the frequency spectrum
Solution Approach 2:
The patent changes the granularity parameter of frequency domain compensation from subband level to a finer level (resource block level or groups of resource blocks). This parameter change enables more precise compensation for frequency-selective fading and interference, directly improving CSI reporting accuracy
2Manufacturing precision
If frequency domain compensation is calculated for each compensation unit, then precoder accuracy is improved, but calculation complexity increases
Solution Approach 1:
The frequency domain compensation calculation is segmented into multiple independent compensation units. Each unit has its own compensation value calculated based on channel conditions specific to that frequency range, improving precoder accuracy while allowing parallel computation to manage overall complexity
Solution Approach 2:
The patent applies frequency domain compensation selectively to non-reference TRPs rather than all TRPs. This partial action approach improves precoder accuracy for multi-TRP scenarios without unnecessarily increasing calculation complexity for single-TRP cases
3Reliability
If CSI parameters are determined from multiple TRPs, then communication reliability is improved, but reporting overhead increases
Solution Approach 1:
CSI parameters from multiple TRPs are merged into a single unified CSI report. The frequency domain compensation values for multiple TRPs are combined and reported together, reducing overall reporting overhead while maintaining the reliability benefits of multi-TRP diversity
Solution Approach 2:
The patent reports frequency domain compensation information selectively for non-reference TRPs only. This partial reporting approach reduces overhead compared to reporting all TRP information, while still providing the necessary compensation data to improve communication reliability through multi-TRP coordination
Data Source
AI summary
This disclosure provides systems, methods, and devices for wireless communication that support coherent joint transmission (CJT) channel state information (CSI) reporting with frequency domain (FD) compensation at a finer than subband size level. In a first aspect, a method of wireless communication includes a user equipment (UE) determining a plurality of CSI parameters for a set of N TRP transmission-reception points (TRPs). The UE may identify a reference TRP, calculate FD compensation for each FD compensation unit to compensate a precoder to each non-reference TRP and corresponds to a delay difference between the each non-reference TRP and the reference TRP. The UE then transmits a CSI report including the FD compensated precoder for each FD compensation unit, wherein the CSI report includes the precoder applicable to a total number of reported TRPs fewer than NTRP−1. Other aspects and features are also claimed and described.