QCL Indication Linking DMRS and TRS for Multistation Tracking
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Solution Overview
Problem
In coordinated multipoint transmission/reception scenarios, interference between cells in intra-frequency deployment leads to poor channel conditions and low transmission performance due to varying channel features from different transmission and reception points, causing inter-carrier and inter-symbol interference.
Innovation Solution
A quasi co-location (QCL) indication method that associates demodulation reference signal (DMRS) parameters with tracking reference signals (TRS) to improve channel estimation accuracy by aligning delay spreads and Doppler shifts, enabling frequency and delay compensation to synchronize DMRS and physical downlink shared channels across multiple network devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If coordinated multipoint transmission/reception is applied to resolve interference between cells, then transmission performance is improved, but channel estimation accuracy deteriorates due to varying channel features from different transmission and reception points
Solution Approach 1:
The patent segments the channel estimation process by introducing separate tracking reference signals (TRS) for different transmission reception points (TRPs). Each TRS tracks channel features specific to its TRP, allowing the terminal to separately estimate and compensate for channel variations from multiple TRPs, thereby maintaining channel estimation accuracy in coordinated multipoint scenarios
Solution Approach 2:
The patent introduces tracking reference signals (TRS) as intermediary elements between the terminal and multiple transmission reception points. These TRS serve as mediators that carry channel state information, enabling the terminal to indirectly track and compensate for channel features from different TRPs without directly estimating each channel separately, thus improving channel estimation accuracy
2Measurement precision
If multiple tracking reference signals are used to track channel features from different transmission reception points, then channel estimation accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent designs tracking reference signals with multi-functionality: the same TRS configuration can be reused across multiple TRPs, and the TRS serves both as a channel estimation reference and as a means for indicating QCL relationships. This universal design reduces the need for separate reference signals for each TRP, thereby reducing signaling overhead while maintaining channel estimation accuracy
3Productivity
If QCL indication information associates DMRS with multiple TRS, then multistation transmission performance is improved, but terminal processing complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring QCL indication information that associates DMRS with multiple TRS before actual data transmission. The terminal uses this pre-established association to directly apply channel estimates from TRS to DMRS without performing complex real-time calculations, thereby reducing processing complexity while improving multistation transmission performance
Data Source
AI summary
This application provides a quasi co-location (QCL) indication method and a related device, and may be applied to coordinated multistation transmission. In the method, a terminal receives QCL indication information, where the QCL indication information indicates that time-frequency spread information of a demodulation reference signal (DMRS) is associated with time-frequency spread information of N tracking reference signals (TRSs) (or a TRS corresponding to the DMRS) and that delay-frequency offset information of the DMRS is associated with delay-frequency offset information of M TRSs.