Adaptive DMRS Patterns Across Resource Blocks and Time Slots
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Solution Overview
Problem
Conventional wireless communication systems face inefficiencies due to rigid DMRS patterns that lead to unnecessary overhead, especially in favorable channel conditions or with advanced receiver capabilities, limiting flexibility and increasing resource usage.
Innovation Solution
Implementing a DMRS pattern with varying parameters across multiple resource blocks and time slots, allowing for flexible DMRS placement and reducing overhead by adapting to channel conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a rigid DMRS pattern is used across all resource blocks, then device complexity is reduced and ease of operation is improved, but resource utilization efficiency deteriorates and unnecessary overhead increases
Solution Approach 1:
The patent implements dynamic DMRS patterns that adapt to channel conditions and transmission requirements. Different DMRS configurations (type 1, type 2, single-symbol, multi-symbol) are selected based on channel variability, allowing the system to transition from static to dynamic operation and improve resource utilization while maintaining ease of use through automated selection.
Solution Approach 2:
The patent applies different DMRS parameters to different resource blocks based on local channel conditions. Specifically, DMRS type, symbol position, and density are customized for specific RB groups rather than uniformly applied, enabling localized optimization of overhead versus estimation accuracy trade-offs.
2Adaptability or versatility
If DMRS parameters are varied across resource blocks, then adaptability and channel estimation accuracy are improved, but device complexity increases
Solution Approach 1:
The patent segments the bandwidth into multiple RB groups, each capable of having independent DMRS configurations. This segmentation allows adaptability at a manageable scale rather than requiring individual customization of every RB, thus balancing versatility with implementation complexity.
Solution Approach 2:
The patent utilizes parameter changes in DMRS configurations (type, density, symbol position) to achieve adaptability. By systematically varying these parameters based on channel conditions and transmission requirements, the system achieves high adaptability while maintaining structured complexity that is manageable through standardized parameter sets.
3Measurement precision
If dense DMRS placement is used across all RBs, then channel estimation accuracy is improved, but resource overhead increases
Solution Approach 1:
The patent applies different DMRS densities to different RB groups based on local channel conditions. In RB groups experiencing high channel variability or interference, denser DMRS placement is used to maintain estimation accuracy, while in stable channel conditions, sparser placement reduces overhead, thus optimizing the balance between precision and resource consumption.
Solution Approach 2:
The patent implements partial dense DMRS placement only where necessary rather than uniformly across all RBs. By applying excessive DMRS density selectively in specific RB groups with poor channel conditions or high mobility, the system achieves required estimation accuracy while minimizing overall overhead through targeted rather than comprehensive application.
Data Source
AI summary
Various aspects of the present disclosure relate to receiving, from a base station, a configuration indicating a demodulation reference signal (DMRS) pattern for a plurality of resource blocks (RBs) or a plurality of time slots, or both, the DMRS pattern comprising different DMRS parameters to be applied across the plurality of RBs or the plurality of time slots, or both; and communicating data with the base station using a transmission grant in accordance with a set of DMRS parameters for each RB or time slot associated with a transmission grant.