Reference Signal Pattern Allocation for Time-Variant Channels
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in reference signal design, particularly in handling varying channel conditions, which affect frequency selectivity and time-variant behavior, leading to challenges in frequency offset estimation and resource utilization.
Innovation Solution
The implementation of N distinct patterns for reference signals allocated to scheduling units, where each pattern has unique configurations such as type, location, and density, allowing flexible adaptation to channel conditions, and the use of bitmaps and predefined rules to enable/disable reference signals based on scheduling information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the same DM-RS pattern is repeated across slots for aggregated transmission, then transmission reliability is improved, but frequency offset estimation accuracy deteriorates due to time-variant channel conditions
Solution Approach 1:
The patent applies dynamics by making the DM-RS pattern configurable and adaptable across different slots rather than static repetition. The network can dynamically select from multiple pattern types (first pattern type with DM-RS in first symbol, second pattern type with DM-RS in second symbol) based on channel conditions, allowing the system to optimize both reliability and estimation accuracy for each slot independently
Solution Approach 2:
The patent changes parameters by introducing multiple DM-RS pattern types with different configurations (symbol positions, densities, allocations). The network can switch between pattern types across slots to adapt to time-variant channel conditions, thereby maintaining accurate frequency offset estimation while preserving transmission reliability through appropriate pattern selection
2Measurement precision
If multiple DM-RS patterns are configured for different slots, then frequency offset estimation accuracy is improved, but system complexity increases due to additional configuration parameters
Solution Approach 1:
The patent segments the DM-RS configuration into distinct pattern types that can be independently selected for different slots. By dividing the overall DM-RS design into manageable pattern categories (first pattern type, second pattern type), the system achieves flexible adaptation to channel conditions while maintaining organized, manageable complexity through structured pattern definitions
Solution Approach 2:
The patent creates universal DM-RS pattern types that can be applied across multiple slots and different transmission scenarios. The first and second pattern types serve as multi-functional building blocks that can be combined with various scheduling units and aggregation factors, reducing the need for completely separate configurations for each scenario and thereby managing system complexity
3Device complexity
If DM-RS is always transmitted in the same resource symbol index, then device complexity is reduced, but adaptability to varying channel conditions deteriorates
Solution Approach 1:
The patent applies dynamics by enabling the DM-RS symbol index to vary across slots based on configured pattern types. Instead of fixed positioning, the system can dynamically place DM-RS in different symbol positions (first symbol, second symbol, or other configurations) to optimize channel estimation performance under varying channel conditions while maintaining manageable complexity through pattern-based configuration
Solution Approach 2:
The patent applies local quality by allowing different DM-RS patterns to be applied to different slots or scheduling units based on local channel conditions. Each slot can have optimally positioned DM-RS symbols tailored to its specific channel characteristics, rather than applying a uniform configuration everywhere, thereby achieving local optimization without overwhelming system complexity
Data Source
AI summary
A wireless communication method for use in a transmitting node is disclosed. The wireless communication method comprises transmitting, to a receiving node, a reference signal comprising N patterns allocated to at least one scheduling unit, wherein N is an integer greater than 1.