DMRS Pattern Configuration for LTE NR Coexistence
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Solution Overview
Problem
Current wireless communication technologies face challenges in coexisting effectively, particularly in managing demodulation reference signals (DMRS) to minimize interference and optimize resource usage when different radio access technologies like LTE and NR operate in the same frequency ranges.
Innovation Solution
The proposed method involves transmitting DMRS based on a pattern configuration indication set, allowing for flexible adaptation in coexistence situations by adjusting the timing and positioning of DMRS within a transmission timing structure, thereby avoiding overlap with cell-specific reference signals of other RATs and efficiently utilizing time/frequency resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If DMRS is transmitted using fixed timing structure, then implementation is simple, but interference with LTE CRS cannot be avoided in coexistence scenarios
Solution Approach 1:
The patent applies dynamics by making the DMRS timing structure flexible and adaptable rather than fixed. The gNB can dynamically select from multiple DMRS patterns (Type 1 and Type 2 with different configurations) based on whether LTE CRS is detected in the cell. This allows the system to automatically adjust the DMRS transmission timing to avoid CRS interference while maintaining implementation feasibility through standardized pattern options.
Solution Approach 2:
The patent changes the timing parameters of DMRS transmission by introducing multiple pattern configurations with different symbol positions and densities. When LTE CRS is present, the system selects patterns that shift DMRS symbols to non-overlapping positions, effectively changing the time-domain parameters to eliminate interference while keeping the same underlying DMRS structure.
2Object-affected harmful factors
If DMRS pattern is made flexible to avoid LTE CRS, then interference is reduced, but signaling overhead and complexity increase
Solution Approach 1:
The patent segments the DMRS configuration into distinct, pre-defined patterns (Type 1 and Type 2 with various symbol positions). Instead of allowing arbitrary timing adjustments that would require complex signaling, the system divides the solution space into manageable pattern options, each with fixed characteristics. The gNB simply indicates which pattern to use, reducing signaling overhead while maintaining flexibility.
Solution Approach 2:
The patent uses lightweight pattern indication mechanisms rather than detailed timing configuration signaling. By defining a small set of reusable patterns and selecting among them through compact indications, the system achieves flexibility without incurring significant signaling overhead, effectively using simple, disposable pattern selections rather than complex persistent configurations.
3Productivity
If resource elements are allocated for DMRS without coordination, then resource utilization is high, but collisions with LTE CRS occur
Solution Approach 1:
The patent applies preliminary action by having the gNB detect or be informed about LTE CRS presence before allocating DMRS resources. Based on this advance knowledge, the gNB pre-selects appropriate DMRS patterns that avoid CRS positions, ensuring that resource allocation for DMRS does not collide with LTE CRS while maintaining high resource utilization through efficient pattern selection.
Data Source
AI summary
There is disclosed a method of operating a network node (100) in a radio access network, the method comprising transmitting signaling in a transmission timing structure, the signaling comprising demodulation reference signaling (DMRS), wherein the DMRS is transmitted on symbols of the transmission timing structure based on a DMRS pattern, the DMRS pattern being based on a pattern configuration indication set. The disclosure also pertains to related methods and devices.