IoV DMRS Pattern Configuration for Channel Estimation
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Solution Overview
Problem
The IoV system based on NR technology faces challenges in realizing flexible configuration of DMRS patterns due to its complex and changeable environment, which affects the accuracy of channel estimation and data reception performance.
Innovation Solution
A method for transmitting data in IoV that allows terminal devices to determine DMRS patterns based on configuration information, resource pools, carriers, waveforms, or numerologies, enabling flexible configuration and balancing reception performance with pilot overhead by using pre-configured or dynamically configured corresponding relationships.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed DMRS pattern is used in IoV system, then the system complexity is reduced, but the channel estimation accuracy deteriorates in complex and changeable vehicle environments
Solution Approach 1:
The patent implements dynamic DMRS pattern configuration where the terminal device determines the DMRS pattern based on current transmission conditions including waveform type, resource pool characteristics, and channel state. This allows the system to adapt DMRS density and positioning dynamically, improving channel estimation accuracy in varying vehicle environments while maintaining manageable complexity through automated determination rules.
Solution Approach 2:
The patent changes multiple parameters of the DMRS pattern including density, positioning, and configuration based on transmission conditions. The terminal device selects from multiple pre-defined DMRS patterns or determines custom patterns based on waveform type (CP-OFDM or DFT-S-OFDM), resource pool configuration, and channel quality, thereby optimizing channel estimation accuracy without requiring complex real-time reconfiguration.
2Measurement precision
If DMRS density is increased to improve channel estimation accuracy, then reception performance is improved, but pilot overhead increases
Solution Approach 1:
The patent applies different DMRS densities and configurations locally based on specific transmission conditions. High DMRS density is applied only when required by poor channel conditions or high mobility scenarios, while lower density is used in stable conditions. The terminal device determines the appropriate DMRS pattern for each transmission based on local channel characteristics, achieving accurate channel estimation where needed while minimizing overall pilot overhead.
Solution Approach 2:
The patent uses partial action by applying increased DMRS density only partially - specifically in resource blocks or time slots where channel conditions warrant it, rather than uniformly across all transmissions. The terminal device selectively determines DMRS pattern density based on channel quality indicators and transmission requirements, avoiding excessive pilot overhead in good conditions while ensuring sufficient overhead in poor conditions.
3Adaptability or versatility
If flexible DMRS pattern configuration is implemented to adapt to varying vehicle environments, then reception performance is improved, but system complexity increases
Solution Approach 1:
The patent implements preliminary action by pre-defining multiple DMRS patterns with different densities and configurations before transmission. The terminal device stores these pre-configured patterns and selects the appropriate one based on current conditions, rather than computing complex patterns in real-time. This preliminary preparation enables environmental adaptability while keeping the determination process relatively simple through pattern selection based on pre-established criteria.
Solution Approach 2:
The terminal device performs self-service by autonomously determining the appropriate DMRS pattern based on its own assessment of transmission conditions, including waveform type, resource pool configuration, and channel state. The device uses pre-configured correspondence relationships between transmission parameters and DMRS patterns to automatically select the optimal pattern without requiring complex network coordination or external assistance, thereby achieving adaptability with manageable complexity.
Data Source
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AI summary
Disclosed by the embodiment of the present application are a method for transmitting data in the Internet of Vehicles, a terminal device and a network device, the method comprising: a terminal device determining a demodulation reference signal (DMRS) pattern corresponding to a first channel; and the terminal device demodulating the first channel according to the DMRS pattern.