Adaptive DM-RS Density Control for Wireless Demodulation Overhead
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Solution Overview
Problem
Current 3GPP specifications limit the adaptability of demodulation reference signal (DM-RS) density, which can lead to inefficient DM-RS transmission, especially when receivers have channel prediction or blind decoding capabilities.
Innovation Solution
Adaptive DM-RS density adjustment based on explicit feedback from the receiver, utilizing blind decoding or channel prediction capabilities, allowing the transmitter to reduce or eliminate DM-RS transmission when feasible, and increase it when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DM-RS transmission density is increased to improve channel estimation accuracy, then receiver demodulation performance is improved, but data rate is reduced due to higher overhead
Solution Approach 1:
The patent implements dynamic DM-RS density adjustment where the transmitter adapts the DM-RS transmission density based on feedback from the receiver about its channel prediction capability. The DM-RS density is changed from an initial value to a new value dynamically, allowing the system to optimize between channel estimation accuracy and data rate based on actual receiver capabilities rather than using a fixed conservative approach
Solution Approach 2:
The patent changes the parameter of DM-RS transmission density based on receiver feedback. The transmitter receives feedback indicating the receiver's channel prediction capability and adjusts the DM-RS density parameter accordingly, transitioning from static parameter configuration to adaptive parameter adjustment based on system conditions
2Reliability
If DM-RS transmission is maintained at high density to ensure reliable demodulation, then demodulation performance is maintained, but resource efficiency is reduced
Solution Approach 1:
The patent introduces a feedback mechanism where the receiver communicates its channel prediction capability to the transmitter. This feedback enables the transmitter to make informed decisions about DM-RS density adjustment, reducing DM-RS transmission when the receiver has strong channel prediction capability while maintaining reliability when needed
Solution Approach 2:
The receiver assesses its own channel prediction capability and communicates this self-evaluation to the transmitter, enabling the system to self-optimize the DM-RS density without external intervention or conservative fixed configurations
3Productivity
If DM-RS density is reduced to increase data rate when receiver has channel prediction capability, then resource efficiency is improved, but demodulation reliability may deteriorate if prediction is inaccurate
Solution Approach 1:
The system dynamically adjusts DM-RS density based on real-time feedback about receiver capability and can further adapt based on NACK feedback indicating potential demodulation failures. This dynamic adjustment allows the system to respond to actual performance conditions rather than relying solely on initial capability assessments
Data Source
AI summary
Demodulation Reference Signal (DM-RS) density is adapted in wireless communication networks. A receiver, especially a user equipment (UE), submits a request to a transmitter, especially to a base station, to change the DM-RS density. The transmitter monitors feedback of the receiver relating to the quality of reception. And the transmitter decides, in dependence of the feedback, whether to indicate a change of DM-RS.