Terminal DMRS Time-Frequency Aggregation for Wide SCS
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Solution Overview
Problem
Existing DMRS designs fail to satisfy the condition of a flat frequency response over a bandwidth occupied by two or three consecutive subcarriers when using a wide subcarrier spacing (SCS) in high-frequency bands exceeding 52.6 GHz, compromising channel estimation performance.
Innovation Solution
The terminal assumes the demodulation reference signal (DMRS) to be more aggregated in the frequency direction and dispersed in the time direction, or uses a Zadoff-Chu sequence, to accommodate wider SCS in high-frequency bands while maintaining commonality with existing frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If a wide subcarrier spacing (SCS) is used in high-frequency bands exceeding 52.6 GHz, then channel coherent time is extended and high-speed movement communication is supported, but the flat frequency response condition over two or three consecutive subcarriers is not satisfied, compromising channel estimation performance
Solution Approach 1:
The DMRS is divided into multiple parts (first DMRS and second DMRS) transmitted at different time positions. The first DMRS is transmitted at an earlier time position and the second DMRS at a later time position, allowing each part to cover different frequency ranges while maintaining overall flat frequency response characteristics even with wide SCS
Solution Approach 2:
The patent introduces time-domain multiplexing as an additional dimension to frequency-domain DMRS aggregation. By dispersing DMRS parts across multiple time positions rather than only frequency positions, the system achieves both wide SCS support and flat frequency response satisfaction
2Adaptability or versatility
If DMRS design is modified to support wide SCS, then compatibility with high-frequency bands is achieved, but commonality with existing DMRS designs for FR1 and FR2 is reduced
Solution Approach 1:
The patent creates a universal DMRS configuration that can serve multiple frequency bands (FR1, FR2, and high-frequency bands exceeding 52.6 GHz) using the same basic structure. The DMRS configuration includes a first portion and a second portion that can be applied across different frequency ranges, reducing the need for separate DMRS designs for each band
Solution Approach 2:
The patent embeds the existing DMRS design structure within the new high-frequency band DMRS configuration. The first DMRS and second DMRS portions are nested within the overall DMRS configuration, allowing the existing FR1/FR2 DMRS design to be contained within the broader framework that also supports high-frequency bands
Data Source
AI summary
A terminal receives a demodulation reference signal from a network. The terminal assumes the demodulation reference signal to be more aggregated in a frequency direction than in a case where a frequency band including one or a plurality of frequency ranges is used, when a different frequency band differing from the frequency band is used or when a wider subcarrier spacing is applied than the case where the frequency band is used.