Dynamic DMRS Configuration for Random Access
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Solution Overview
Problem
In wireless communication systems, the use of a fixed Demodulation Reference Signal (DMRS) pattern for different use cases and scenarios is not efficient, leading to suboptimal resource utilization and channel estimation, particularly in random access procedures where DMRS patterns do not adapt to varying UE characteristics such as mobility and speed.
Innovation Solution
A method to dynamically select and control DMRS configurations based on obtained information about the user equipment (UE), such as mobility, power limitations, and position, to optimize DMRS transmission during random access procedures, reducing overhead and improving resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed DMRS pattern is used for all UEs, then device complexity is reduced and ease of operation is improved, but resource utilization efficiency deteriorates and channel estimation precision deteriorates
Solution Approach 1:
The patent implements dynamic DMRS configuration where the network node selects different DMRS patterns (first pattern with more DMRS transmissions, second pattern with fewer DMRS transmissions) based on UE mobility characteristics. This transforms the static fixed pattern into a dynamic adaptive system that adjusts DMRS density according to actual channel conditions, resolving the contradiction between operational simplicity and resource efficiency.
Solution Approach 2:
The patent applies different DMRS patterns to different UE groups based on their specific characteristics (high mobility vs. low mobility). Instead of using a uniform pattern everywhere, the system tailors the DMRS configuration locally to each UE's mobility profile, optimizing resource usage for each scenario while maintaining overall system efficiency.
2Measurement precision
If more DMRS transmissions are used, then channel estimation precision is improved, but resource utilization efficiency deteriorates due to increased overhead
Solution Approach 1:
The patent changes the DMRS configuration parameters (number of DMRS transmissions per slot) based on UE mobility characteristics. For high mobility UEs, the system increases DMRS transmissions to improve channel estimation precision. For low mobility UEs, it reduces DMRS transmissions to minimize overhead. This parameter adaptation resolves the contradiction between estimation precision and resource efficiency.
Solution Approach 2:
The system dynamically adjusts DMRS transmission density according to real-time UE mobility conditions rather than using a fixed pattern. This dynamic approach ensures that DMRS resources are allocated optimally - sufficient for high mobility scenarios requiring precise tracking, and minimal for low mobility scenarios where fewer reference signals suffice.
Data Source
AI summary
A random access procedure may be provided by a network node for use with a user equipment, UE, of a wireless communication system. A demodulation reference signal, DMRS, configuration may be selected from among a set of DMRS configurations based on obtained information. A DMRS transmission may be controlled during the random access procedure based on the selected DMRS configuration. The UE may receive an indication of the DMRS configuration from the network node, may select the DMRS configuration from among a set of DMRS configurations based on the received indication, and may control DMRS transmission during the random access procedure based on the selected DMRS configuration.