sPUSCH Shared DM-RS Configuration for LTE Uplink

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Solution Overview

Problem

There is a lack of specific configuring methods for the short Transmission Time Interval (sTTI) in the 3GPP LTE/LTE-Advanced system for the short uplink data channel (sPUSCH), particularly in relation to operating it based on a shared demodulation reference signal (DM-RS).

Innovation Solution

A method is provided for configuring the sPUSCH based on a short TTI within one subframe by incorporating a shared DM-RS in specific symbols, allowing for efficient transmission to the base station, with configuration information being exchanged between the UE and the base station regarding the position of the shared DM-RS within the sTTI.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of substance

If a shared DM-RS is configured in specific symbols of sTTI, then overhead is reduced and resource allocation is optimized, but the complexity of configuring and managing the shared reference signal increases

Engineering Contradiction:

ImproveoverheadVSAvoidconfiguration complexity

Core Design Contradiction:

Loss of substanceVSDevice complexity

Solution Approach 1:

The patent merges the DM-RS configuration across multiple sTTIs by allowing a single DM-RS to be shared among multiple short transmission time intervals. This combining approach reduces the total number of reference signals needed, thereby reducing overhead while the standardized sharing rules keep configuration complexity manageable

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The shared DM-RS serves multiple functions simultaneously: it provides demodulation reference for multiple sTTIs, enables channel estimation across different time intervals, and supports multiple users or layers. This multi-functionality reduces overall overhead while the universal configuration approach maintains manageable complexity

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Loss of time

If short TTI is implemented for sPUSCH, then latency is reduced and throughput is improved, but the lack of specific configuring methods increases implementation complexity

Engineering Contradiction:

ImprovelatencyVSAvoidimplementation complexity

Core Design Contradiction:

Loss of timeVSDevice complexity

Solution Approach 1:

The patent segments the TTI into shorter intervals (sTTI) while maintaining a standardized configuration framework. This segmentation reduces latency by enabling faster transmission and processing cycles, while the systematic configuration methods provided in the patent keep implementation complexity manageable through structured approaches

Inventive Principle:

Principle #1Segmentation

3Productivity

If DM-RS is shared across multiple sTTIs, then resource allocation efficiency is improved, but the precision of channel estimation may be affected

Engineering Contradiction:

Improveresource allocation efficiencyVSAvoidchannel estimation precision

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The patent applies local quality by configuring DM-RS with specific properties in specific symbols and sTTIs based on local channel conditions and requirements. This allows optimized resource allocation efficiency in different time intervals while maintaining adequate channel estimation precision where needed through localized adjustments

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS10892867B2Method for establishing uplink data channel on basis of shared demodulation reference signal, and device therefor

Publication Date: 2021.01.12 KT CORP

AI summary

Provided are an sTTI setting method for an sPUSCH in a short ITT frame structure and a specific operating method for an sPUSCH based on a shared DM-RS. In the method, a shared DM-RS within an SPUSCH is allocated only to a specific symbol included in a partial sTTI and is used in all sPUSCHs within a legacy TTI (=1 ms).