Multi-TRP CSI-RS Calibration Reporting for Time-Frequency Synchronization
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Solution Overview
Problem
Wireless communication networks face challenges in synchronizing user equipment (UE) with multiple Transmission Reception Points (TRPs) due to time and frequency/phase offsets, which affect signal transmission and reception efficiency.
Innovation Solution
UE measures and reports network calibration parameters, such as time delays and frequency offsets, by analyzing Channel State Information Reference Signals (CSI-RS) from multiple TRPs, generating calibration reports to adjust wireless signal transmission and processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE communicates with multiple TRPs simultaneously, then the network capacity and coverage are improved, but time and frequency synchronization between TRPs becomes more difficult to maintain
Solution Approach 1:
The UE measures calibration parameters (time delay and frequency offset) between multiple TRPs and feeds back these measurements to the network. The network uses this feedback to adjust TRP transmission parameters, achieving synchronization. This closed-loop feedback mechanism enables the network to maintain synchronization accuracy while supporting multiple TRPs for improved capacity.
Solution Approach 2:
The patent replaces traditional mechanical synchronization methods with signal-based measurement and processing. The UE uses CSI-RS signals to measure calibration parameters, and the network uses digital signal processing to adjust TRP transmissions based on these measurements, substituting physical synchronization mechanisms with information-based control.
2Measurement precision
If the UE measures and reports calibration parameters for multiple TRPs, then the synchronization accuracy is improved, but the signaling overhead and processing complexity increase
Solution Approach 1:
The calibration measurement mechanism serves multiple functions: it provides both uplink synchronization calibration and downlink synchronization calibration. The same CSI-RS measurement process and reporting mechanism are used for both purposes, reducing the need for separate measurement systems and simplifying overall device complexity while maintaining high calibration accuracy.
Solution Approach 2:
The UE autonomously performs calibration parameter measurements and generates calibration reports without requiring complex network coordination for each measurement. The UE self-manages the measurement process, parameter calculation, and report generation, reducing the signaling overhead and processing complexity that would otherwise be required for network-controlled calibration.
3Productivity
If the network adjusts transmission based on calibration reports, then the signal transmission efficiency is improved, but the network processing load increases
Solution Approach 1:
The network performs calibration parameter adjustments in advance based on UE measurements before actual data transmission begins. By pre-adjusting TRP transmission parameters using calibration reports, the network eliminates the need for continuous real-time adjustments during data transmission, reducing ongoing processing power requirements while maintaining high transmission efficiency.
Data Source
AI summary
Disclosed are methods, systems, and computer-readable medium to perform operations including: measuring a first Channel State Information Reference Signal (CSI-RS) received from a first transmission reception point (TRP) of a plurality of TRPs; measuring a second CSI-RS received from a second TRP of the plurality of TRPs; determining a time delay and a frequency offset between the first TRP and the second TRP based on the first CSI-RS and the second CSI-RS; and generating a calibration report including the determined time delay and the determined frequency offset for transmission to the first TRP and the second TRP.