DMRS Mapping Pattern Configuration for Cellular Reception
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Solution Overview
Problem
Current DMRS mapping methods in cellular communication systems are not adaptable to varying reception environments, leading to suboptimal channel quality and interference issues when terminals switch between small cells, especially when increasing DMRS power for neighboring cells.
Innovation Solution
A communication method and apparatus that dynamically configures DMRS mapping patterns for each terminal based on its specific reception environment, using signaling bits to indicate whether to map DMRSs in specific groups, allowing for reduced DMRS allocation in frequency- and time-domain directions, and employing techniques like cyclic shift hopping and zero power DMRSs to improve channel estimation and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If DMRS power is increased for neighboring cells to improve channel quality, then channel estimation accuracy improves, but interference to other terminals increases
Solution Approach 1:
The patent applies local quality by configuring different DMRS mapping patterns for different terminals based on their specific reception environments. Each terminal receives DMRS resources tailored to its channel conditions, allowing targeted channel estimation improvement without universally increasing interference. The base station selectively applies DMRS power and mapping configurations only where needed for each terminal's specific location and environment.
Solution Approach 2:
The patent implements dynamics by dynamically selecting and configuring DMRS mapping patterns based on terminal mobility states and reception environment changes. When terminals switch between small cells or experience changing channel conditions, the system adapts the DMRS configuration in real-time, transitioning between different mapping patterns (first pattern for low mobility, second pattern for high mobility) to maintain optimal channel estimation while controlling interference.
2Productivity
If DMRS mapping is optimized for each terminal to improve transmission rate, then communication efficiency improves, but system complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the DMRS resource allocation into distinct mapping patterns tailored for different terminal groups. Instead of using a single complex configuration for all terminals, the system segments terminals based on mobility characteristics and assigns appropriate DMRS patterns, simplifying the overall system while maintaining optimized performance for each segment.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting DMRS mapping parameters (such as resource element positions, density, and pattern selection) based on terminal-specific conditions. This allows the system to achieve high transmission rates through parameter optimization without requiring fundamentally complex system architecture, as the changes are made within existing framework parameters.
3Device complexity
If fixed DMRS pattern is used for all terminals to simplify configuration, then system complexity decreases, but adaptability to varying reception environments deteriorates
Solution Approach 1:
The patent applies universality by designing a DMRS mapping system that can serve multiple functions through a unified framework. The same base station and signaling infrastructure supports both first and second mapping patterns, allowing the system to adapt to different terminal requirements without requiring separate systems. This multi-functional approach maintains relatively simple configuration while achieving high adaptability.
Solution Approach 2:
The patent implements dynamics by enabling the DMRS configuration to change adaptively based on terminal mobility and reception conditions. The system transitions between fixed and flexible configurations as needed, selecting the first mapping pattern for low-mobility terminals and the second pattern for high-mobility terminals, thus achieving both simplicity and adaptability through dynamic adjustment.
4Productivity
If DMRS resources are reduced for terminals with good channel quality to increase data region, then resource efficiency improves, but reception quality may deteriorate
Solution Approach 1:
The patent applies partial action by selectively reducing DMRS resources only for terminals with good channel quality and stable reception environments, while maintaining full DMRS resources for terminals with poor channel quality or high mobility. This partial reduction approach optimizes resource efficiency for suitable terminals without compromising reception quality for those who need robust channel estimation.
Solution Approach 2:
The patent implements local quality by applying different DMRS resource allocation strategies to different terminals based on their specific channel conditions. Terminals with good channel quality receive reduced DMRS allocation (optimizing resource efficiency), while terminals with poor channel quality receive full DMRS allocation (maintaining reception quality). This localized optimization resolves the contradiction between resource efficiency and reception quality.
Data Source
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AI summary
Disclosed is a transmission apparatus which enables high transmission-rate communication by mapping DMRSs in a way adapted to the reception environment of each terminal. The transmission apparatus includes: reference signal configuration section (101) that configures a DMRS mapping pattern for each terminal and outputs a DMRS and information indicating the DMRS mapping pattern; and transmission section (106) that transmits a transmission signal including the information indicating the DMRS mapping pattern configured by reference signal configuration section (101) and the DMRS mapped according to the DMRS mapping pattern to the terminal.