DMRS Quasi-Co-Location Signaling During Network Frequency Compensation
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately determining quasi-co-location (QCL) between demodulation reference signal (DMRS) ports and reference signals during frequency compensation, which affects data reception efficiency.
Innovation Solution
The method involves receiving an indication of valid QCL between DMRS ports and reference signals based on frequency compensation performed by the network, allowing for improved data reception on the physical downlink shared channel (PDSCH).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If frequency compensation is performed by the network, then data reception efficiency is improved, but accuracy in determining quasi-co-location between DMRS ports and reference signals deteriorates
Solution Approach 1:
The network performs frequency compensation in advance before transmitting data on PDSCH, and provides an indication to the UE about whether DMRS ports are delay-related validly QCL'd with reference signals. This preliminary action allows the UE to correctly interpret QCL relationships despite the frequency compensation being applied, thereby maintaining measurement precision while achieving improved data reception efficiency.
2Measurement precision
If indication of valid QCL is provided to UE, then data reception accuracy is improved, but communication overhead increases
Solution Approach 1:
The patent extracts only the essential QCL validity indication information needed for accurate data reception and transmits it separately from the main data stream. By taking out only the critical QCL indication rather than transmitting all possible channel state information, the system achieves improved data reception accuracy while minimizing communication overhead.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive an indication of whether one or more first demodulation reference signal ports are delay-related validly quasi-co-located with one or more first reference signals based on frequency compensation performed by a network. Accordingly, the UE may receive data on a physical downlink shared channel based at least in part on the indication. Numerous other aspects are described.