PUCCH PUSCH DMRS Bundling Duration Phase Coherence
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, face challenges in maintaining transmit phase coherence for demodulation reference signals (DMRS) during bundling, which affects channel estimation and overall communication efficiency.
Innovation Solution
The method involves transmitting a first indication of a maximum DMRS bundling duration to a network entity to maintain phase coherence and receiving a second indication for DMRS bundling activation or duration, allowing for the transmission of UL repetitions with bundled DMRS based on these indications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If DMRS bundling is performed for extended duration to improve channel estimation, then channel quality estimation is improved, but transmit phase coherence is lost
Solution Approach 1:
The patent implements dynamic DMRS bundling where the bundling duration is not fixed but adapts based on phase coherence maintenance. The system dynamically adjusts the bundling window size and timing to preserve phase coherence while maximizing channel estimation accuracy, transforming a static bundling approach into a flexible, condition-based mechanism.
Solution Approach 2:
The patent changes key parameters including bundling duration, bundling window size, and timing offsets based on channel conditions and phase coherence requirements. By adjusting these parameters dynamically, the system optimizes the trade-off between channel estimation precision and phase coherence maintenance for different transmission scenarios.
2Measurement precision
If DMRS bundling duration is extended to improve channel estimation accuracy, then measurement precision is improved, but the duration of action exceeds the coherence time
Solution Approach 1:
The patent performs preliminary phase coherence assessment and predicts the maximum viable bundling duration before initiating DMRS bundling. By预先 determining the coherence time and setting the bundling duration accordingly, the system ensures that channel estimation is performed within the coherent period, preventing degradation from excessive duration.
Solution Approach 2:
The patent implements periodic phase coherence checks during the transmission process, resetting or adjusting the bundling window when coherence degrades. This periodic monitoring and renewal mechanism allows the system to maintain accurate channel estimation by repeatedly establishing new coherent bundling periods rather than using one excessively long bundling duration.
Data Source
AI summary
This disclosure provides systems, devices, apparatus, and methods, including computer programs encoded on storage media, for PUCCH/PUSCH DMRS bundling. A UE may transmit, to a network entity, a first indication of a maximum DMRS bundling duration for maintaining transmit phase coherence for transmitted DMRS. The UE may receive, from the network entity based on the first indication of the maximum DMRS bundling duration, a second indication of at least one of a DMRS bundling activation or a DMRS bundling duration. Based on the at least one of the DMRS bundling activation or the DMRS bundling duration, the UE may transmit at least one UL repetition including bundled DMRS.