CSI-Based TRP Calibration for Coherent Joint Transmission
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Solution Overview
Problem
Existing wireless communication networks face challenges in achieving coherent joint transmission (CJT) due to imperfect calibration of transmission reception points (TRPs) resulting in frequency, time, and phase offsets, which negatively impact MIMO performance.
Innovation Solution
A method for wireless communication that involves decoding resource configuration data for channel state information (CSI) reference signals to calibrate TRPs, encoding CSI reports with measurement data, and reporting timing, frequency, and phase offsets to assist TRPs in achieving coherent joint transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If TRPs transmit without calibration, then device complexity is reduced, but MIMO performance deteriorates due to frequency, time, and phase offsets
Solution Approach 1:
The patent applies preliminary action by performing calibration before the actual data transmission. The gNB measures timing, frequency, and phase offsets using reference signals from multiple TRPs and performs calibration adjustments in advance. This ensures that when data transmission occurs, the TRPs are already synchronized, achieving reliable MIMO performance without adding complexity during the data transmission phase.
Solution Approach 2:
The patent implements feedback through the measurement report mechanism. The gNB measures offset values (timing, frequency, phase) from TRP reference signals and feeds this information back to calibrate the TRP transmissions. This feedback loop enables continuous improvement of synchronization, resolving the contradiction between reliability and complexity by automating the calibration process.
2Productivity
If multiple TRPs are used for transmission, then productivity is improved through diverse transmission paths, but device complexity increases due to synchronization requirements
Solution Approach 1:
The patent uses preliminary action by pre-calibrating multiple TRPs before they begin transmitting. The gNB measures and records timing, frequency, and phase offsets for each TRP in advance, then applies these calibration values during data transmission. This allows multiple TRPs to operate simultaneously with improved productivity while the synchronization complexity is managed through pre-computed calibration parameters rather than real-time coordination.
3Measurement precision
If CSI-RS resources are configured for multiple TRPs, then measurement precision is improved for calibration, but device complexity increases due to configuration management
Solution Approach 1:
The patent applies universality by configuring TRP-specific reference signals that serve multiple purposes: they enable precise measurement of timing, frequency, and phase offsets for calibration, while also serving as standard reference signals for channel state information (CSI) feedback. This multi-functionality allows the same TRP reference signals to support both calibration accuracy and normal data transmission, reducing configuration complexity.
Data Source
AI summary
Disclosed are methods, systems, and computer-readable medium to perform operations including decoding resource configuration data specifying a channel state information (CSI) reference signal (RS) resource configuration for performing one or more channel measurements for calibrating one or more transmissions from one or more transmission reception points (TRPs); and encoding, based on the CSI-RS resource configuration specified by the resource configuration data, a CSI report including one or more offset measurements for transmitting to the one or more TRPs for calibration of the one or more TRPs for a coherent joint transmission (CJTs).