Terminal DMRS Pattern Selection for Data Rate and Channel Estimation
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Solution Overview
Problem
The network configuration in small cell enhancement requires flexible and efficient selection of DMRS patterns to optimize data rate and channel estimation accuracy, considering varying channel quality and interference levels in small cell environments.
Innovation Solution
A terminal and base station system that allows dynamic selection of DMRS patterns, including legacy and reduced DMRS, based on uplink control information, enabling flexible switching between different mapping patterns to suit channel conditions and terminal capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If legacy DMRS pattern is used, then channel estimation accuracy is improved, but data rate is reduced due to higher overhead
Solution Approach 1:
The patent implements dynamic selection between legacy DMRS pattern and reduced DMRS pattern based on terminal capability and channel conditions. The base station determines which pattern to use and notifies the terminal, allowing the system to adapt between conservative (legacy) and aggressive (reduced) DMRS configurations to optimize the trade-off between channel estimation accuracy and data rate.
2Productivity
If reduced DMRS pattern is used, then data rate is improved by reducing overhead, but channel estimation accuracy may deteriorate
Solution Approach 1:
The system dynamically switches between reduced DMRS pattern (for higher data rate) and legacy DMRS pattern (for better channel estimation accuracy) based on terminal capability indicators and channel conditions. This allows the network to exploit reduced overhead when terminal capability permits while maintaining robust channel estimation when needed.
Solution Approach 2:
The patent changes the DMRS configuration parameters (mapping pattern, density) based on terminal capability and channel conditions. The base station determines appropriate DMRS parameters and notifies the terminal, enabling flexible adjustment of DMRS overhead and distribution to match service requirements and terminal processing capabilities.
3Adaptability or versatility
If multiple DMRS patterns are supported, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamic DMRS pattern selection where the base station determines the appropriate pattern based on terminal capability indication and channel conditions, then notifies the terminal. This centralizes the complexity in the base station while keeping terminal complexity manageable through capability indication and following base station instructions.
Solution Approach 2:
The system design allows the same terminal to support multiple DMRS patterns (legacy and reduced) through universal processing capability, enabled by terminal capability indication. The terminal can adapt its processing based on which pattern is selected, making the system universally compatible with different DMRS configurations without requiring separate hardware for each pattern.
Data Source
AI summary
The present disclosure aims at allowing a demodulation reference signal (DMRS) pattern suitable for a terminal to be selected from among a plurality of DMRS patterns including Legacy DMRS and Reduced DMRS. Disclosed is a terminal including: reception section 21 that receives uplink control information; control section 23 that determines a specific mapping pattern from among a plurality of mapping patterns for an uplink DMRS on the basis of the control information; and DMRS generating section 24 that generates a DMRS according to the specific mapping pattern.