DMRS Pattern Switching for Lower BLER in 5G NR Channels
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Solution Overview
Problem
Existing wireless communication systems, particularly 5G NR, face challenges in adapting DMRS patterns dynamically to varying network and channel conditions, leading to suboptimal performance and increased block error rates due to non-orthogonal DMRS types causing interference.
Innovation Solution
Implementing dynamic DMRS pattern switching by UE and gNB, where UEs report support for dynamic DMRS switching and receive pattern indications via DCI or RRC, allowing for different DMRS patterns with varying FD-OCC lengths to be applied to uplink and downlink channels based on network conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed DMRS configuration is used, then device complexity is reduced and ease of operation is improved, but network performance deteriorates and BLER increases under varying network conditions
Solution Approach 1:
The patent implements dynamic DMRS pattern switching by introducing a DMRS pattern indicator in DCI messages that enables the UE to switch between different DMRS patterns (first pattern with longer FD-OCC and second pattern with shorter FD-OCC) based on current network conditions. This dynamic adaptation resolves the contradiction by allowing the system to optimize performance reliability while maintaining operational simplicity through automated switching.
2Reliability
If dynamic DMRS pattern switching is implemented, then network performance is improved and BLER is reduced, but device complexity increases
Solution Approach 1:
The patent changes the DMRS configuration parameters dynamically by introducing a DMRS pattern indicator that switches between predefined patterns with different FD-OCC lengths. This approach improves reliability by adapting to network conditions while limiting device complexity through the use of a finite set of predefined patterns rather than requiring continuous parameter optimization.
3Adaptability or versatility
If DMRS patterns with different FD-OCC lengths are used, then adaptability to different network conditions is improved, but processing complexity increases
Solution Approach 1:
The patent implements dynamic switching between DMRS patterns with different FD-OCC lengths based on network conditions. The gNB selects the appropriate pattern (longer FD-OCC for high frequency-selectivity, shorter FD-OCC for low frequency-selectivity) and signals the UE via DCI, enabling adaptability while managing processing complexity through automated selection.
Solution Approach 2:
The patent changes the FD-OCC length parameter dynamically by switching between predefined DMRS patterns. This provides adaptability to different frequency-selectivity conditions while limiting processing complexity through the use of a finite set of predefined patterns with specific FD-OCC lengths rather than requiring continuous parameter adjustment.
Data Source
AI summary
In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a UE. In certain configurations, the UE receives a message having Demodulation Reference Signal (DMRS) switching bits that indicate which DMRS pattern is being used of either of a first DMRS pattern or a second DMRS pattern. The UE determines the DMRS pattern being used from the DMRS switching bits. The UE applies the determined DMRS pattern being used to processing of uplink and downlink channels.