Per-Subband DMRS Configuration Selection for Wireless Links
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in demodulation reference signal (DMRS) configuration management, particularly due to latency in RRC reconfiguration procedures, leading to unstable links and sub-optimal spectral efficiency across varying channel conditions and sub-bands.
Innovation Solution
Implementing a method where user equipment (UE) determines optimal DMRS configurations for each sub-band based on channel characteristics and link quality metrics, and communicates these to the base station for adaptive selection, allowing for dynamic adjustment of DMRS configurations to maximize spectral efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If RRC reconfiguration procedures are used to adjust DMRS configurations, then DMRS configuration can be changed, but latency increases and link stability deteriorates
Solution Approach 1:
The patent segments the DMRS configuration adjustment process from the RRC reconfiguration procedure. The UE independently determines optimal DMRS configurations for each sub-band based on channel characteristics and link quality metrics, then reports these to the base station. This segmentation allows configuration changes without triggering full RRC reconfiguration, thereby reducing latency while maintaining adaptability.
Solution Approach 2:
The UE performs preliminary analysis of channel characteristics and link quality metrics to determine optimal DMRS configurations before reporting to the base station. This preliminary action enables the base station to quickly apply pre-computed configurations without requiring time-consuming RRC reconfiguration procedures, thus reducing latency while maintaining configuration optimality.
2Adaptability or versatility
If RRC reconfiguration procedures are used to adjust DMRS configurations, then DMRS configuration can be changed, but link stability deteriorates
Solution Approach 1:
The patent segments the configuration adjustment mechanism from RRC reconfiguration, allowing DMRS configurations to be updated through independent UE determination and reporting. This segmentation prevents the link instability caused by RRC reconfiguration while maintaining the ability to adapt DMRS configurations to changing channel conditions.
Solution Approach 2:
The UE autonomously determines optimal DMRS configurations based on its measurements of channel characteristics and link quality metrics. This self-service capability allows the UE to adapt configurations without external RRC reconfiguration, thereby maintaining link stability while achieving configuration adaptability.
3Device complexity
If single DMRS configuration is used across all sub-bands, then device complexity is reduced, but spectral efficiency deteriorates
Solution Approach 1:
The patent applies local quality by determining separate optimal DMRS configurations for each sub-band based on local channel characteristics and link quality metrics. This per-sub-band configuration optimization improves spectral efficiency by adapting to local conditions, while the UE's autonomous determination capability keeps device complexity manageable.
Solution Approach 2:
The patent changes the parameter of DMRS configuration from a single global setting to multiple per-sub-band settings. By allowing different configurations across sub-bands based on channel characteristics and link quality metrics, spectral efficiency is improved while the UE handles the complexity through automated determination and reporting mechanisms.
4Productivity
If per-sub-band DMRS configuration is implemented, then spectral efficiency is improved, but device complexity increases
Solution Approach 1:
The UE autonomously determines optimal DMRS configurations for each sub-band based on its measurements of channel characteristics and link quality metrics. This self-service capability allows per-sub-band configuration optimization to improve spectral efficiency while keeping device complexity manageable through automated processes rather than manual management.
Solution Approach 2:
The UE measures channel characteristics and link quality metrics, uses this feedback to determine optimal configurations, reports them to the base station, and receives confirmation. This feedback loop enables per-sub-band optimization while managing complexity through systematic automated processes.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A base station may transmit, to a user equipment (UE), a first demodulation reference signal for each of one or more sub-bands and configured in accordance with a first one or more demodulation reference signal configurations. The UE may select a second demodulation reference signal configuration from a respective set of second demodulation reference signal configurations for each of the one or more sub-bands and may transmit an indication of the second demodulation reference signal configuration for each of the one or more sub-bands. The base station may receive the indication and may transmit, to the UE, a second demodulation reference signal for each of the one or more sub-bands and configured in accordance with the second demodulation reference signal configuration for each of the one or more sub-bands.