Radio Node Reference Signals for Low-Resolution DAC Transmission
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Solution Overview
Problem
The utilization of low-resolution digital-to-analog converters (DACs) in wireless communications systems leads to quantization distortion and degraded channel estimation and equalization, particularly in RS transmission, affecting signal quality and energy efficiency.
Innovation Solution
Implementations provide for low-resolution transmit behaviors by defining discrete time-domain reference signals (DT-RS) and utilizing time division multiplexing (TDM) with other transmissions, adjusting parameters, and generating RSs using digital quantization steps to minimize quantization distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If low-resolution DACs are used in wireless communications, then energy consumption is reduced and cost is decreased, but quantization distortion increases and signal quality deteriorates
Solution Approach 1:
The patent applies parameter changes by modifying the quantization resolution dynamically. The system uses multiple DACs with different resolution levels (e.g., 6-bit and 8-bit DACs) and selectively activates them based on channel conditions, signal type, and quality requirements. This allows the system to operate at lower resolution for energy efficiency when conditions permit, while switching to higher resolution when signal quality becomes critical.
Solution Approach 2:
The system implements dynamic resolution switching where the DAC resolution is not fixed but adapts in real-time based on communication conditions. The base station can dynamically select between different DAC configurations (different resolution levels) depending on the current channel state, traffic type, and quality of service requirements, thereby optimizing the trade-off between energy consumption and signal quality.
2Device complexity
If low-resolution DACs are used, then device complexity and cost are reduced, but channel estimation accuracy and equalization performance deteriorate
Solution Approach 1:
The patent changes the resolution parameter of the DAC based on operational requirements. By having multiple DACs with different resolution levels and selectively activating them, the system can use lower-resolution DACs for general operations to reduce complexity while switching to higher-resolution DACs when accurate channel estimation and equalization are required.
Solution Approach 2:
The system dynamically adjusts the DAC resolution level based on channel conditions and signal requirements. When channel estimation accuracy is critical (e.g., during initial connection or in poor channel conditions), the system activates higher-resolution DACs. During stable conditions with good signal quality, it switches to lower-resolution DACs to reduce device complexity.
3Reliability
If quantization steps are increased to reduce distortion, then signal quality improves, but energy consumption and device complexity increase
Solution Approach 1:
The patent implements parameter changes by using multiple DACs with different quantization resolutions (e.g., 6-bit, 8-bit, 10-bit). The system dynamically selects the appropriate resolution level based on signal quality requirements, allowing it to use lower resolution (lower energy consumption) when signal quality is sufficient and higher resolution (higher energy consumption) when quality improvement is needed.
Solution Approach 2:
The system employs dynamic resolution adjustment where the quantization step size is not fixed but adapts based on communication conditions. The base station monitors signal quality metrics and dynamically switches between different DAC configurations, increasing resolution only when necessary to maintain or improve signal quality, thereby optimizing energy consumption.
Data Source
AI summary
Various aspects of the present disclosure relate to low-resolution behavior in a radio node. An apparatus, such as a user equipment (UE) and/or a network equipment (NE), transmits first capability information comprising one or more low-resolution transmit behaviors of the first radio node, receives second configuration information for transmission of a reference signal, and transmits, based at least in part on the second configuration information, one or more reference signals.