NR Precoding Maintenance for Cross-Slot DMRS Channel Estimation
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Solution Overview
Problem
In a new radio (NR) communication environment, terminals are unable to effectively use demodulation reference signals (DMRSs) of adjacent slots due to varying precoding between slots, as the base station does not inform the terminal about precoding changes, leading to suboptimal channel estimation performance.
Innovation Solution
An electronic device and base station system that ensures the same precoding matrix is maintained between slots by transmitting a precoding change restriction request or signal, allowing for improved channel estimation through interpolation of DMRS channel estimation results during a guaranteed precoding maintenance interval.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the base station changes precoding for each slot to support multi-layer transmission, then transmission flexibility and adaptability are improved, but channel estimation performance deteriorates because the terminal cannot use DMRSs of adjacent slots
Solution Approach 1:
The base station applies precoding in advance for multiple slots and signals the terminal about this beforehand. By preparing the precoding configuration ahead of time and informing the terminal, the system enables the terminal to use DMRSs from adjacent slots for channel estimation, resolving the contradiction between transmission flexibility and estimation accuracy
Solution Approach 2:
The base station provides feedback information to the terminal about the applied precoding configuration. This feedback mechanism allows the terminal to understand which DMRSs can be reliably used for channel estimation, enabling accurate measurement even when precoding changes between slots
2Device complexity
If the base station does not inform the terminal about precoding changes, then system complexity is reduced, but the terminal cannot accurately detect precoding changes and maintain proper channel estimation
Solution Approach 1:
The terminal autonomously detects precoding changes by monitoring DMRS signals without requiring explicit base station notifications. The terminal self-determines whether to use adjacent slot DMRSs by analyzing signal characteristics, maintaining reliable channel estimation while avoiding complex base station signaling
Data Source
AI summary
An electronic device includes a communication circuit that receives a physical channel from a base station, a memory, and a processor that determines whether a precoding maintenance signal is received from the base station, and based on a determination that the precoding maintenance signal is not received, transmits a precoding change restriction request to the base station. The precoding change restriction request corresponds to a request to maintain a precoding matrix applied by the base station for a certain interval.