Multi-DM-RS and PT-RS Mapping for Overhead-Efficient Estimation
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Solution Overview
Problem
Existing solutions for joint design of DM-RS and PT-RS are limited to scenarios with a single DM-RS instance, and there is a need to control pilot contamination while maintaining robustness against phase noise in high-frequency wireless systems.
Innovation Solution
A method for joint mapping of DM-RS and PT-RS based on the position of the front-loaded DM-RS in the slot, required time density, and positions of the first and last symbols for data transmission, aligning PT-RS with DM-RS to reduce overhead and ensure accurate estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If PT-RS and DM-RS are separately scheduled without joint mapping, then each reference signal can be independently configured, but the total reference signal overhead increases and resource utilization efficiency decreases
Solution Approach 1:
The patent applies joint mapping of PT-RS and DM-RS into a unified time-frequency resource pattern. By merging the scheduling of these two reference signals, the system reduces total overhead and improves resource utilization efficiency while maintaining the necessary configuration flexibility through parameter-based adaptation.
2Measurement precision
If DM-RS time density is increased to track fast channel changes in high-speed scenarios, then channel estimation accuracy improves, but the time resources consumed by DM-RS increase
Solution Approach 1:
The patent designs the joint mapping pattern such that DM-RS instances serve dual purposes: channel estimation for demodulation and phase noise tracking. By making the reference signal pattern universal, the system achieves accurate channel estimation without requiring separate additional reference signals, thus reducing time resource consumption.
3Reliability
If PT-RS is added to mitigate phase noise effects in mmWave systems, then phase noise compensation performance improves, but the reference signal overhead and resource consumption increase
Solution Approach 1:
The patent merges PT-RS and DM-RS into a single joint mapping pattern, allowing the phase tracking reference signal to be transmitted simultaneously with demodulation reference signals. This combining approach provides effective phase noise compensation while minimizing additional overhead by eliminating redundant separate PT-RS transmissions.
4Adaptability or versatility
If multiple DM-RS instances are scheduled in a slot to support multiple MIMO layers, then spatial multiplexing capability improves, but the complexity of reference signal scheduling increases
Solution Approach 1:
The patent segments the joint mapping pattern into distinct DM-RS instances corresponding to different MIMO layers, with each instance following the same temporal structure but differentiated in frequency resources. This segmentation enables independent configuration for each layer while maintaining a unified scheduling framework that reduces overall complexity.
Data Source
AI summary
A method, network node and wireless device in a wireless communication system for one of transmitting and receiving a phase-tracking reference signal, PT-RS. The method includes obtaining information about a position in a time domain of a scheduled first demodulation reference signal, DM-RS, in a slot, and one of transmitting and receiving the PT-RS within the slot, the position of the PT-RS depending on the position in the time domain of the scheduled first DM-RS.