PUCCH Spatial Filtering for Joint Channel Estimation
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Solution Overview
Problem
Existing wireless communication systems, particularly 5G NR, face challenges in improving channel estimation accuracy and efficiency for physical uplink control channels (PUCCHs) due to variations in spatial relation and power control parameters across multiple PUCCHs.
Innovation Solution
Implementing phase continuity and consistent spatial relation parameters across a set of PUCCHs, along with coordinated power control parameters, to enable joint channel estimation by both user equipment (UE) and base stations, using DMRSs for bundled demodulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate spatial relation parameters are used for each PUCCH, then adaptability to different channel conditions is improved, but channel estimation accuracy deteriorates due to phase discontinuity
Solution Approach 1:
The patent segments the spatial relation parameter configuration by introducing a master PUCCH and slave PUCCH distinction. The master PUCCH uses one spatial relation parameter while slave PUCCHs use another, allowing separate optimization for each segment while maintaining phase continuity within the slave group for accurate channel estimation.
Solution Approach 2:
Different spatial relation parameters are applied to different PUCCHs based on their specific channel conditions and requirements. The master PUCCH receives higher priority with its own spatial relation parameter, while slave PUCCHs share a common parameter optimized for phase continuity, achieving local optimization for each PUCCH's quality requirements.
2Use of energy by moving object
If different power control parameters are applied to each PUCCH, then power efficiency is improved, but system complexity increases due to coordinated parameter management
Solution Approach 1:
The patent merges power control parameter management by associating multiple PUCCHs (master and slaves) with common power control parameters. This consolidation reduces the number of independent parameter sets that need to be managed, thereby reducing system complexity while still allowing power optimization across the PUCCH group.
3Measurement precision
If joint channel estimation is implemented across multiple PUCCHs, then channel estimation accuracy is improved, but processing complexity increases
Solution Approach 1:
The joint channel estimation process is segmented into master PUCCH processing and slave PUCCH processing. The master PUCCH is processed independently first, establishing a reference for phase continuity. Slave PUCCHs are then processed with reference to the master, reducing the overall processing complexity compared to fully independent processing of all PUCCHs.
Data Source
AI summary
A method for uplink spatial filter and power control for channel estimation across physical uplink control channels is provided. The method includes user equipment (UE) receiving, from a base station (BS), an indication to transmit a set of physical uplink control channels (PUCCHs) having a demodulation reference signal (DMRS), receiving, from the BS, one or more indicators indicating respective power control parameters for the set of PUCCHs, and based on different power control parameters being applied to transmissions, transmitting, to the BS, a first PUCCH and a second PUCCH from the set of PUCCHs comprising corresponding DMRSs having phase discontinuity. The one or more indicators further indicates respective spatial relation parameters for the set of PUCCHs, and wherein the set of PUCCHs are transmitted with the phase discontinuity based on different spatial relation parameters being applied to the transmissions.